WO2013058059A1 - Constant velocity universal joint - Google Patents

Constant velocity universal joint Download PDF

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Publication number
WO2013058059A1
WO2013058059A1 PCT/JP2012/074289 JP2012074289W WO2013058059A1 WO 2013058059 A1 WO2013058059 A1 WO 2013058059A1 JP 2012074289 W JP2012074289 W JP 2012074289W WO 2013058059 A1 WO2013058059 A1 WO 2013058059A1
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WO
WIPO (PCT)
Prior art keywords
circumferential
intermediate member
diameter
constant velocity
velocity universal
Prior art date
Application number
PCT/JP2012/074289
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French (fr)
Japanese (ja)
Inventor
真一 高部
Original Assignee
Ntn株式会社
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Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2013058059A1 publication Critical patent/WO2013058059A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/202—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints
    • F16D3/205—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
    • F16D3/2055—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part having three pins, i.e. true tripod joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
    • F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover

Definitions

  • the present invention relates to a constant velocity universal joint.
  • Constant velocity universal joints used in power transmission devices such as automobiles and various industrial machines are fitted with boots to prevent leakage of grease sealed inside the joints and to prevent foreign matters such as dust from entering the joints.
  • the boot generally has a large-diameter mounting portion attached to the opening of the outer joint member of the constant velocity universal joint, and a small-diameter mounting portion attached to a shaft connected to the inner joint member of the constant velocity universal joint. And a bent portion (bellows portion) that connects the large-diameter mounting portion and the small-diameter mounting portion.
  • a fixed type constant velocity universal joint for example, a Rzeppa type, a barfield type, etc.
  • slidable constant velocity universal joints for example, double offset type, tripod type, cross groove type, etc.
  • an outer joint member there exists a cylindrical surface shape or a non-cylindrical surface shape in the outer-diameter surface shape of the opening part by which a boot is mounted
  • Such boots include resin boots (thermoplastic elastomer boots) and rubber boots (chloroprene rubber boots).
  • Chloroprene rubber boots have relatively good performance as boots for constant velocity universal joints, but have aspects such as fatigue resistance, wear resistance, low temperature resistance, heat aging resistance, and grease resistance (oil resistance). Depending on the use conditions, it may not be sufficient. For this reason, it tends to be replaced by a boot made of thermoplastic elastomer having better performance.
  • the outer peripheral surface shape of the opening of the outer joint member is a non-cylindrical surface shape
  • the inner peripheral surface of the large-diameter mounting portion of the boot attached to the outer joint member needs to be formed into a non-cylindrical shape along the outer peripheral surface shape.
  • a non-cylindrical shape consisting of a thick portion and a thin portion requires a relatively high level of molding technology, so that the contour of the outer joint member is a non-cylindrical constant velocity universal joint. The use of is delayed compared to the cylindrical one.
  • an interposing member (intermediate member) is externally fitted to a non-cylindrical opening, and a large-diameter mounting portion of a boot is externally fixed to the intermediate member ( Patent Documents 1 to 3).
  • the intermediate member is formed of a ring body in which the outer peripheral surface is a cylindrical surface, and the inner peripheral surface is formed with an inward bulging portion that fits into the recess of the non-cylindrical surface shape portion of the outer joint member. Therefore, a boot having a cylindrical large-diameter mounting portion can be used as it is by fitting (externally fitting) such an intermediate member into the opening of the outer joint member of the constant velocity universal joint. That is, the thermoplastic elastomer boot need not have a shape corresponding to the non-cylindrical opening.
  • the intermediate member as described above is used, the intermediate member is a ring body. Therefore, if the large-diameter mounting portion of the boot is externally fitted to such an intermediate member, the outer diameter of the mounting portion to this outer joint member The size becomes large, which inevitably increases the outermost diameter.
  • the present invention can suppress the increase in the outermost diameter, and can use a boot made of a thermoplastic elastomer having a large-diameter mounting portion of the boot in a cylindrical shape. And a constant velocity universal joint excellent in sealing performance.
  • the constant velocity universal joint includes an outer joint member, an inner joint member accommodated in the outer joint member, and a torque transmission member interposed between the outer joint member and the inner joint member.
  • the joint member has a mouth portion in which the inner joint member is accommodated, and the mouth portion has a non-cylindrical shape in which a large-diameter portion and a small-diameter portion appear alternately when viewed in a cross section.
  • a constant velocity universal joint to which a boot made of a thermoplastic polyester elastomer is fitted and fixed via an intermediate member, wherein the mouth portion opening portion of the outer joint member has a peripheral portion on the opening end side at a large diameter portion.
  • a thick-walled portion that fits into the small-diameter portion when the intermediate member is externally fitted to the mouth portion opening portion. And fitted into the circumferential recess of the large diameter portion.
  • a circular arc connecting portion that connects adjacent thick portions in the direction, and a portion corresponding to the circumferential convex portion of the large diameter portion is formed with a notch portion into which the circumferential convex portion is fitted, In a state where the boot is fitted on the intermediate member, the inner peripheral surface of the large-diameter mounting portion of the boot contacts the circumferential convex portion via the notch portion.
  • the intermediate member has its thick portion fitted into the small diameter portion of the outer joint member, and its arcuate connection portion fits into the circumferential recess of the large diameter portion. It can be stably mounted on the boot mounting portion (open end portion) of the mouse portion of the outer joint member.
  • the outer peripheral surface of the intermediate member is a short cylindrical body having a cylindrical surface shape, the large-diameter mounting portion can be obtained by externally fitting the large-diameter mounting portion of the boot, which is a short cylindrical portion, to the intermediate member. Can be brought into close contact with the outer peripheral surface of the intermediate member.
  • the intermediate member has a notch for fitting the circumferential convex portion at a portion corresponding to the circumferential convex portion of the large diameter portion
  • the large diameter mounting portion of the boot is attached to the intermediate member.
  • the inner peripheral surface of the large-diameter mounting portion can be brought into contact with the circumferential convex portion, and in this state, the arc-shaped connecting portion is fitted in the circumferential concave portion of the large-diameter portion. . For this reason, even when the boot is mounted, the outermost diameter can be kept small.
  • the outer diameter of the outer peripheral surface of the intermediate member is the same as the outer diameter of the circumferential protrusion of the large diameter portion or the circumferential protrusion of the large diameter portion. It can be set to be slightly larger than the outer diameter dimension.
  • the outer diameter of the thick portion of the intermediate member may be slightly larger than the outer diameter of the arc-shaped connecting portion of the intermediate member.
  • the inner circumferential surface of the intermediate member is provided with at least one circumferential inner ridge that presses against the bottom surface of the circumferential groove
  • the inner circumferential surface of the large-diameter mounting portion of the boot is provided on the outer circumferential surface of the intermediate member.
  • two circumferential inner ridges that are pressed against the bottom surface of the circumferential groove are provided at predetermined intervals in the axial direction on the inner circumferential surface of the intermediate member, and one circumferential outer ridge is provided on the outer circumferential surface of the intermediate member.
  • the circumferential inner ridge and the circumferential outer ridge are ridges continuous in the circumferential direction of the outer joint member.
  • the large-diameter mounting portion of the boot is formed with a circumferential concave groove in which a boot band is mounted on the outer peripheral surface thereof, and is circumferentially bulged in an axial intermediate corresponding portion of the circumferential concave groove on the inner peripheral surface thereof.
  • a first circumferential groove is formed between the circumferential convex portion of the outer joint member and the arc-shaped coupling portion of the intermediate member, and the first circumferential groove on the outer circumferential surface of the thick portion of the intermediate member is formed.
  • a second circumferential groove is formed at a position corresponding to the axial direction of the one circumferential groove, and the first circumferential groove and the second circumferential groove constitute a circumferential fitting groove that is continuous in the circumferential direction.
  • the vertical cross-sectional shape of the outer peripheral surface of the thick portion of the intermediate member and the vertical cross-sectional shape of the outer peripheral surface of the outer circumferential member of the outer joint member or the arc-shaped connecting portion of the intermediate member seem to be substantially the same shape. Can be.
  • the circumferential concave portion and the small diameter portion of the large-diameter portion of the outer joint member are joined via an edge portion, and the edge portion is connected to the arcuate connection portion and the thick-walled portion in the intermediate member with the intermediate member attached. It is preferable to bite into the boundary part.
  • thermoplastic elastomer boot having the cylindrical shape of the large-diameter mounting portion of the boot can be attached to the outer joint member of the constant velocity universal joint while minimizing the outermost diameter. For this reason, it is easy to improve the mounting property and positioning stability of the large-diameter mounting portion of the boot with respect to the outer joint member, and to ensure stable sealing performance. And since the boot made from a thermoplastic elastomer can be applied, durability improves compared with the boot made from a chloroprene rubber, and the reliability of boot performance improves.
  • FIG. 2 is a sectional view taken along line XX of FIG.
  • FIG. 2 is a cross-sectional view taken along line YY in FIG.
  • It is a front view of the intermediate member used for the constant velocity universal joint shown in the said FIG.
  • It is a side view of the intermediate member used for the constant velocity universal joint shown in the said FIG.
  • It is a principal part expanded sectional view of the constant velocity universal joint shown in the said FIG.
  • FIG. 2 is an enlarged cross-sectional view of a main part after the intermediate member shown in FIG. 1 is mounted.
  • the tripod type constant velocity universal joint includes an outer joint member 1, a tripod member 2 as an inner joint member, and a torque transmission member 3. .
  • the outer joint member 1 has a cup-shaped mouth portion 4 opened at one end, and a stem portion 5 projecting from the bottom wall of the mouth portion 4, and is axially located at a three-way position in the circumferential direction of the inner circumference.
  • An extending track groove 6 is formed.
  • the mouse part 4 has a non-cylindrical shape in which the large diameter part 4a and the small diameter part 4b appear alternately when viewed in cross section. That is, the mouse portion 4 is formed with the large-diameter portion 4a and the small-diameter portion 4b, whereby the three track grooves 6 extending in the axial direction are formed on the inner peripheral surface thereof.
  • Roller guide surfaces (roller contact surfaces) 7 and 7 are formed on the side walls facing each other in the circumferential direction of each track groove 6. Further, the inner peripheral surface has a three-valve corollary shape in which the small inner diameter portion 12 and the large inner diameter portion 13 that appear alternately in the circumferential direction are connected by the roller guide surface 7. That is, in the outer joint member 1, the track groove 6 composed of the roller guide surface 7 facing in the circumferential direction and the large inner diameter portion 13 provided between the roller guide surfaces 7, 7 is formed at three locations on the inner periphery. Is.
  • the tripod member 2 includes a boss 8 and a leg shaft 9.
  • the boss 8 is formed with a female spline 11 coupled to the shaft 10 so as to be able to transmit torque.
  • the leg shaft 9 protrudes in the radial direction from the circumferentially divided position of the boss 8.
  • Each leg shaft 9 includes a cylindrical outer peripheral surface 14 and an annular ring groove 16 formed in the vicinity of the shaft end.
  • a roller member 20 constituting the torque transmission member 3 is externally fitted to the outer periphery of the leg shaft 9 via a plurality of needle rollers 17.
  • the cylindrical outer peripheral surface 14 of the leg shaft 9 provides the inner raceway surface of the needle roller 17.
  • the inner peripheral surface of the roller member 20 is cylindrical and provides the outer raceway surface of the needle roller 17.
  • the needle roller 17 is in contact with the outer washer 21 at the outer end face viewed in the radial direction of the leg shaft 9, and is in contact with the inner washer 22 at the opposite end face. Since the outer washer 21 is restricted from moving in the axial direction by the circlip 23 attached to the ring groove 16, the needle roller 17 is also restricted from moving in the axial direction.
  • the male spline 25 of the end of the shaft (shaft member) 10 is fitted into the female spline 11 of the tripod member 2, and the female spline 11 and the male male spline 25 are fitted. Further, a retaining ring 26 for retaining is attached to the distal end portion and the proximal end portion of the end male spline 25.
  • the opening of the outer joint member 1 is sealed by the boot 30. Therefore, a boot mounting portion 31 is formed on the opening side of the outer peripheral surface of the outer joint member 1 (opening portion of the mouse portion 4). Then, the boot 30 is fitted on the boot mounting portion 31 via an intermediate member 50 described later, and is tightened by the boot band 32.
  • the boot 30 includes a large-diameter portion attaching portion 30a, a small-diameter attaching portion 30b, and a bellows portion (connecting portion) 30c that can be bent and stretched to connect the large-diameter attaching portion 30a and the small-diameter attaching portion 30b.
  • the boot 30 is made of a thermoplastic polyester elastomer having a hardness of 35 or more and 50 or less according to a type D durometer defined in JIS K 6253.
  • a thermoplastic polyester elastomer is a material having an elastic modulus intermediate between a very flexible material such as vulcanized rubber and a highly rigid material such as a thermoplastic resin.
  • thermoplastic polyester-based elastomer has the characteristics of both vulcanized rubber and thermoplastic resin. Even when it is deformed, it has rubber elasticity that restores its original shape, higher mechanical strength than vulcanized rubber, It is a material exhibiting characteristics such as thermoplasticity to which a molding method applied to a thermoplastic resin can be applied.
  • the large-diameter portion 4 a has a circumferential convex portion 35 on the opening end side and the circumferential convex portion 35, as shown in FIGS. 3 and 7.
  • the boot mounting portion 31 is formed by forming a circumferential recess 36 on the back side of the joint.
  • a chamfered portion 38 composed of a tapered surface (inclined surface) 38a and a rounded portion 38b is formed on the outer peripheral surface of the large diameter portion 4a.
  • a circumferential recessed portion 36 is formed on the outer peripheral surface on the opening end side, and a circumferential protruding portion 35 is formed between the circumferential recessed portion 36 and the chamfered portion 38.
  • the circumferential recess 36 includes a bottom surface 37 having a predetermined depth, an opening-side taper portion 36b, and a joint back-side taper surface 36c. For this reason, the circumferential projection 35 has a trapezoidal longitudinal cross-sectional shape.
  • the taper angle ⁇ (inclination angle with respect to the joint axis) of the tapered surface 38a is preferably set to 25 ° or more and 60 ° or less, and more preferably set to 25 ° or more and 45 ° or less. Further, in the small diameter portion 4b, the entire circumferential range has a straight vertical cross section, and the cross sectional shape has an arc shape.
  • the large-diameter mounting portion 30a of the boot 30 has a short cylindrical shape, and as shown in FIGS. 1 and 7, a circumferential groove 40 in which the boot band 32 is mounted is formed on the outer peripheral surface thereof. On the inner peripheral surface of the large-diameter mounting portion 30a, a circumferential bulging portion 42 is formed at the axially corresponding intermediate portion.
  • the small-diameter mounting portion 30b of the boot 30 has a short cylindrical shape, and a circumferential groove 43 in which the boot band 32 is mounted is formed on the outer peripheral surface thereof as shown in FIG. On the inner peripheral surface of the small-diameter mounting portion 30b, a circumferential bulging portion 44 is formed at the axially corresponding intermediate portion.
  • the small-diameter mounting portion 30 b is fitted on the boot mounting portion 45 of the shaft (shaft member) 10.
  • the boot mounting portion 45 includes a circumferential groove 46 and circumferential ridges 47 provided at both ends of the circumferential groove 46.
  • the intermediate member 50 is fitted into the large-diameter attachment portion 30a and attached to the boot attachment portion 31 of the outer joint member 1.
  • the intermediate member 50 can be made of resin, rubber, or thermoplastic elastomer. In other words, any material can be selected because it can be used even if it does not maintain performances such as fatigue, wear and low temperature required for the boot. Of course, you may select the material which can be used for boots.
  • the intermediate member 50 may be integrally formed, or may be applied in combination with a form divided in the circumferential direction. For example, when the intermediate member 50 is mounted on the boot mounting portion 31 of the outer joint member 1 and a material that cannot be deformed for mounting is selected, the intermediate member 50 divided in the circumferential direction is applied. Good.
  • the intermediate member 50 includes a ring portion 50a including a thin arc-shaped connecting portion 61 and protrusions 50b disposed at a 120 ° pitch in the circumferential direction.
  • the taper part 51a is formed in one axial direction edge part of the ring part 50a, and the said protrusion part 50b is provided in a row by this axial direction end surface.
  • the projecting portion 50b has an inner circumferential surface that has an arc shape that fits into the small-diameter portion 4b of the outer joint member 1, and an outer circumferential surface that includes the first tapered arc portion 52a on the outer end side and the first tapered arc.
  • a first arcuate surface part 52b provided continuously with the part 52a, a second taper arcuate part 52c on the opposite side of the first taper arcuate part 52a via the first arcuate surface part 52b, the second taper arcuate part 52c and the taper.
  • a second arcuate surface part 52d between the part 51a and the part 51a is formed.
  • a rounded portion 52e is formed at a corner portion between the first tapered arc portion 52a and the outer end surface of the protruding portion 50b.
  • each protruding portion 50b is fitted to each small diameter portion 4b.
  • the arc-shaped connecting portion 61 of the ring portion 50 a is fitted into the circumferential recess 36.
  • the arc-shaped connecting portion 61 of the ring portion 50a is formed with a tapered portion 51b at the other axial end, as shown in FIG. 7, and this tapered portion 51b is a tapered surface 36c of the circumferential recess 36.
  • a circumferential groove 53 is formed between the arc-shaped connecting portion 61 of the ring portion 50 a and the circumferential convex portion 35. That is, the circumferential groove 53 is formed by the tapered portion 36b, the bottom surface 37, and the tapered portion 51a.
  • the small diameter portion 4b includes a second tapered arc portion 52c, a second arc surface portion 52d, and a tapered portion 51a as shown in FIG.
  • the circumferential groove 54 is formed.
  • the circumferential groove 54 and the circumferential groove 53 constitute a circumferential fitting groove 55 that is continuous in the circumferential direction.
  • the intermediate member 50 includes the protruding portion 50b and a part of the ring portion 50a corresponding to the axial direction, and the intermediate member 50 is fitted to the small diameter portion 4b when the intermediate member 50 is externally fitted to the mouth portion opening.
  • a portion 60 is formed.
  • an arcuate connecting portion 61 is formed which is fitted in the circumferential recess 36 of the large diameter portion 4a and connects the thick portions adjacent in the circumferential direction. . For this reason, there is no member on the joint opening side between the protrusions 50b adjacent in the circumferential direction.
  • a notch 62 in which the circumferential convex portion 35 of the outer joint member 1 is fitted is provided.
  • the vertical cross-sectional shape of the outer peripheral surface of the thick portion 60 of the intermediate member 50 and the vertical cross-sectional shape of the outer peripheral surface where the arc-shaped connecting portion 61 of the intermediate member 50 continues are substantially the same shape. It can be set to be.
  • the large-diameter mounting portion 30a of the boot 30 is externally fitted to the intermediate member 50 in a state where the thus configured intermediate member 50 is mounted on the boot mounting portion 31 of the outer joint member 1, the large-diameter mounting portion
  • the circumferential bulging portion 42 of 30 a is fitted into a circumferential fitting groove 55 constituted by a circumferential groove 53 and a circumferential groove 54.
  • the outer diameter D1 (see FIG. 5) of the outer peripheral surface of the intermediate member 50 is the outer diameter D2 of the circumferential convex portion 35 of the large diameter portion 4a in a state in which the intermediate member 50 is externally fitted to the mouth portion opening. Same as (see FIG. 7) or set to be slightly larger than the outer diameter D2 of the circumferential convex portion 35 of the large diameter portion 4a.
  • the outer diameter D3 (see FIG. 5) of the thick portion 60 of the intermediate member 50 and the outer diameter D4 (see FIG. 5) of the arc-shaped connecting portion 61 of the intermediate member 50 are set to be the same.
  • the outer diameter dimension D3 of the thick portion 60 of the intermediate member 50 is slightly smaller than the outer diameter dimension D4 of the arc-shaped connecting portion 61 of the intermediate member 50. You may set so that it may be large.
  • the large-diameter mounting portion 30a of the boot 30 In the state where the large-diameter mounting portion 30a of the boot 30 is externally fitted, the inner peripheral surface of the large-diameter mounting portion 30a and the outer peripheral surface of the arc-shaped connecting portion 61 of the intermediate member 50 are in direct contact. Therefore, in this state, when the boot band 32 is tightened (reduced in diameter) in the circumferential concave groove 40 on the outer peripheral surface of the large-diameter mounting portion 30 a, the circumferential bulge portion 42 is fixed to the circumferential fitting groove 55. At the same time, the inner peripheral surface of the large-diameter mounting portion 30 a is in close contact (pressure contact) with the outer peripheral surface of the arc-shaped connecting portion 61 of the intermediate member 50. For this reason, the large-diameter mounting portion 30 a of the boot 30 is fixed in a stable state to the boot mounting portion 31 of the outer joint member 1 via the intermediate member 50.
  • the outer joint member 1 is made of metal such as iron, and the intermediate member 50 is made of resin, rubber, thermoplastic elastomer, or the like, so that the deformation amount of the intermediate member 50 increases. For this reason, when the boot 30 is mounted and fixed with a fastening member such as the boot band 32, the outer diameter D1 of the outer peripheral surface of the intermediate member 50 is equal to the outer diameter D2 of the circumferential convex portion 35 of the large diameter portion 4a. It was set to be slightly larger than the outer diameter D2 of the circumferential convex portion 35 of the same or large diameter portion 4a. That is, the outer diameter of the outer peripheral surface of the intermediate member 50 is desirably 1 to 1.02 times the outer diameter of the circumferential protrusion 35 of the outer joint member 1.
  • the thick portion 60 has a larger deformation amount when the boot 30 is mounted and fixed with a fastening member such as the boot band 32 than the arc-shaped connecting portion 61 of the intermediate member 50. Accordingly, the binding force is kept uniform by making the outer diameter D3 slightly larger than the outer diameter D4. Accordingly, the outer shape of the intermediate member 50 in this case is not a perfect circle but a substantially cylindrical shape such as a mussel shape.
  • the outer diameter (maximum) of the thick part 60 is preferably 1 to 1.05 times the outer diameter of the arcuate connecting part 61. If it exceeds 1.05 times, non-uniformity of the binding force applied to the arc-shaped connecting part 61 and the thick part 60 occurs.
  • the outer shape of the thick portion 60 may be a cylinder, or may be a convex shape with a thick central portion and thin end portions (joined portions with the arc-shaped connecting portion 61).
  • the intermediate member 50 has a thick-walled portion 60 fitted into the small-diameter portion 4b of the outer joint member 1, and an arc-shaped connecting portion 61 formed in the circumferential recess of the large-diameter portion 4a. Since it fits in 36, it can mount
  • the outer peripheral surface of the intermediate member 50 is a short cylindrical body having a cylindrical surface shape, by fitting the large-diameter mounting portion 30a of the boot 30 that is a short cylindrical portion to the intermediate member 50, The inner peripheral surface of the large-diameter mounting portion 30a and the outer peripheral surface of the intermediate member 50 can be brought into close contact with each other.
  • the intermediate member 50 is provided with a notch 62 in which the circumferential convex portion 35 is fitted at a portion corresponding to the circumferential convex portion 35 of the large-diameter portion 4a.
  • the inner peripheral surface of the large-diameter mounting portion 30a of the boot 30 can be brought into contact with the circumferential convex portion 35. Further, in this state, the arc-shaped connecting portion 61 Is fitted in the circumferential recess 36 of the large diameter portion 4a. For this reason, even when the boot 30 is mounted, the maximum outer diameter can be kept small.
  • the outermost diameter is minimized and the thermoplastic elastomer boot 30 having the cylindrical shape of the large-diameter mounting portion 30a is attached to the outer joint member 1 of the constant velocity universal joint. Can do. For this reason, it is easy to improve the mounting property and positioning stability of the large-diameter mounting portion 30a of the boot 30 with respect to the outer joint member 1, and to ensure a stable sealing property. Since the thermoplastic elastomer boot 30 can be applied, the durability is improved as compared with the chloroprene rubber boot and the reliability of the boot performance is improved.
  • the boot 30 has fatigue, wear and high speed rotation ( It can be used for a long time with a stable function as the boot 30.
  • the hardness by the type D durometer prescribed in JIS K6253 is less than 35 or more than 50, the fatigue and wear properties are not so excellent.
  • the taper surface 38a is formed on the outer peripheral surface of the mouth portion opening end of the outer joint member 1, the turning joint efficiency of the outer joint member 1 is improved and the outer joint member of the large-diameter mounting portion 30a of the boot 30 is improved. It is possible to improve the mountability of the first boot mounting portion 31. In this case, when the taper angle ⁇ of the taper surface 38a exceeds 60 °, the boot mounting property is hindered. When the taper angle ⁇ is less than 25 °, the axial length of the outer joint member 1 becomes large, and space efficiency and strength are increased. Not preferable.
  • a pair of circumferential inner ridges 65, 66 may be provided on the inner circumferential surface over the entire circumference.
  • each of the circumferential inner ridges 65 and 66 has a triangular cross section.
  • arc-shaped circumferential inner ridges 67 different from the circumferential inner ridges 65, 66 may be provided on the inner peripheral surface of the thick portion 60.
  • the circumferential inner protrusion 67 also has a triangular cross section.
  • outer circumferential protrusion 70 may be provided on the outer peripheral surface of the intermediate member 50 over the entire circumference.
  • an arcuate outer circumferential ridge 71 having an arc shape different from the circumferential outer ridge 70 may be provided on the outer circumferential surface of the thick portion 60. It is preferable to provide the circumferential outer ridge 70 at a position corresponding to an intermediate portion between the circumferential inner ridges 65 and 66. By providing in this way, the intermediate member 50 exhibits stable adhesion on the outer peripheral side and the inner peripheral side.
  • the outer circumferential ridges 70 and 71 have a triangular cross section.
  • the circumferential inner ridges 65, 66, 67 and the like become crushed when they are mounted, and the intermediate member 50 and the outer joint member 1
  • the sealing performance between the two is improved.
  • the circumferential outer ridges 70 and 71 are provided, the circumferential outer ridges 70 and 71 are crushed when mounted, and between the intermediate member 50 and the large-diameter mounting portion 30 a of the boot 30.
  • the circumferential inner ridge 67 is preferably provided at a position corresponding to the circumferential projection 35 of the outer joint member 1.
  • the circumferential inner ridges 65, 66, 67 and the outer circumferential ridges 70, 71 are not limited to a triangular shape in cross section, and may have various shapes such as a semicircle, a semi-ellipse, and a rectangle. Things can be adopted. In this case, it is preferable that the cross-sectional shape is a triangular shape as shown in the figure by considering the sealing property.
  • the height T (see FIGS. 11 and 12) of the circumferential inner ridges 65, 66, 67 and the circumferential outer ridges 70, 71 is preferably 0.3 mm or more and 1 mm or less. If it is less than 0.3 mm, it is difficult to obtain the effect of this ridge (seal improvement effect), and if it exceeds 1 mm, the adhesion to the mating surface is reduced or the binding force is uneven when the boot band 32 is fastened. Is more likely to occur.
  • the circumferential inner ridges 65 and 66 corresponding to the circumferential recess 36 of the outer joint member 1 are formed at the joint portion between the arc-shaped connecting portion 61 and the thick portion 60 of the intermediate member 50.
  • a concave arc-shaped portion 75 is formed.
  • a boundary portion (a boundary portion corresponding to the concave arc-shaped portion) between the large diameter portion 4 a and the small diameter portion 4 b of the outer joint member 1 is an edge portion 76.
  • the boundary portion (edge portion) 76 of the outer joint member 1 bites into the concave arc-shaped portion 75 of the intermediate member 50. become. Thereby, an improvement in sealing performance can be achieved. If the radius of curvature (R dimension) of the concave arcuate portion 75 of the intermediate member 50 is too large, a space is created by the central portion of the concave member 75 and the sealing performance is lowered. On the other hand, if the radius of curvature (R dimension) is too small, the biting property of the edge portion 76 is lowered. Therefore, this radius of curvature (R dimension) is preferably about R0.5 mm to R5 mm.
  • the cross-sectional shape is not limited to a triangular shape, and various shapes such as a semicircle, a semi-ellipse, and a rectangle can be employed.
  • the cross-sectional shape is preferably a triangular shape as shown in the figure.
  • it when setting it as a triangular shape, it may be a regular triangle or an isosceles triangle.
  • the numbers of the circumferential inner ridges 65, 66, 67 and the circumferential outer ridges 70, 71 are not limited to those in the illustrated example, and can be arbitrarily set.
  • constant velocity universal joints even fixed type constant velocity universal joints such as Barfield type (BJ) and undercut free type (UJ), sliding type such as tripod type, double offset type, cross groove type, etc.
  • BJ Barfield type
  • UJ undercut free type
  • sliding type such as tripod type, double offset type, cross groove type, etc.
  • a quick universal joint may be used.
  • the tripod type constant velocity universal joint may be a single roller type or a double roller type.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Diaphragms And Bellows (AREA)
  • Sealing Devices (AREA)

Abstract

Provided is a constant velocity universal joint which has a reduced maximum outer diameter and for which a thermoplastic elastomer boot having a mounting section formed in a cylindrical shape can be used to thereby provide the constant velocity universal joint with excellent durability and seal characteristics, the mounting section being adapted for mounting to an outer joint member. The opening of the mouth of an outer joint member (1) is configured so that large-diameter sections (4a) have formed thereon circumferential protrusions (35) and circumferential recesses (36) and so that, in the small-diameter sections (4b), the entire circumferential range of the small-diameter sections (4b) has a rectilinear longitudinal cross-sectional shape. An intermediate member (50) is a short cylindrically shaped body and has an outer peripheral surface having a cylindrical surface shape. The intermediate member (50) has thick-walled sections (60) which fit in the small-diameter sections (4b) and circular arc-shaped connection sections (61) which connect the thick-walled sections (60). Cutouts with which the circumferential protrusions engage are formed in the portions of the intermediate member (50) which correspond to the circumferential protrusions (35).

Description

等速自在継手Constant velocity universal joint
　本発明は、等速自在継手に関する。 The present invention relates to a constant velocity universal joint.
　自動車や各種産業機械等の動力伝達装置に使用される等速自在継手には、継手内部に封入されたグリースの漏れ防止や継手内部への塵埃等の異物侵入防止を目的に、ブーツが装着される。ブーツは、一般的には、等速自在継手の外側継手部材の開口部に装着される大径取付部と、等速自在継手の内側継手部材に連結されたシャフトに装着される小径取付部と、大径取付部と小径取付部とを連結する屈曲部（蛇腹部）とで構成される。 Constant velocity universal joints used in power transmission devices such as automobiles and various industrial machines are fitted with boots to prevent leakage of grease sealed inside the joints and to prevent foreign matters such as dust from entering the joints. The The boot generally has a large-diameter mounting portion attached to the opening of the outer joint member of the constant velocity universal joint, and a small-diameter mounting portion attached to a shaft connected to the inner joint member of the constant velocity universal joint. And a bent portion (bellows portion) that connects the large-diameter mounting portion and the small-diameter mounting portion.
　等速自在継手として、θ＝４５～５０ｄｅｇ程度の大きな作動角を取ることができる固定式等速自在継手（例えば、ツェッパ型、バーフィールド型等）や、作動角はそれ程大きくとることができないが、外側継手部材の軸線方向にスライドすることができる摺動式等速自在継手（例えば、ダブルオフセット型、トリポード型、クロスグルーブ型等）がある。そして、外側継手部材としては、ブーツが装着（外嵌固定）される開口部の外径面形状が、円筒面形状や非円筒面形状のものがある。 As a constant velocity universal joint, a fixed type constant velocity universal joint (for example, a Rzeppa type, a barfield type, etc.) capable of taking a large operating angle of θ = 45 to 50 deg, or an operating angle cannot be so large. There are slidable constant velocity universal joints (for example, double offset type, tripod type, cross groove type, etc.) that can slide in the axial direction of the outer joint member. And as an outer joint member, there exists a cylindrical surface shape or a non-cylindrical surface shape in the outer-diameter surface shape of the opening part by which a boot is mounted | worn (fixed by external fitting).
　そして、この種のブーツには、樹脂製ブーツ（熱可塑性エラストマー製ブーツ）やゴム製ブーツ（クロロプレンラバー製ブーツ）等がある。 Such boots include resin boots (thermoplastic elastomer boots) and rubber boots (chloroprene rubber boots).
　クロロプレンラバー製ブーツは、等速自在継手用ブーツとして比較的良好な性能を持っているが、耐疲労性、耐摩耗性、耐低温性、耐熱老化性、耐グリース性（耐油性）などの面で、使用条件によっては十分とは言えない場合も発生する。このため、より優れた性能を持つ熱可塑性エラストマー製ブーツに置き換わる傾向にある。 Chloroprene rubber boots have relatively good performance as boots for constant velocity universal joints, but have aspects such as fatigue resistance, wear resistance, low temperature resistance, heat aging resistance, and grease resistance (oil resistance). Depending on the use conditions, it may not be sufficient. For this reason, it tends to be replaced by a boot made of thermoplastic elastomer having better performance.
　外側継手部材の開口部の外周面形状が、非円筒面形状である場合、そこに装着するブーツの大径取付部の内周面は、前記外周面形状に沿った非円筒形状に成形する必要がある。しかしながら、熱可塑性エラストマー製ブーツでは、厚肉部と薄肉部から成る非円筒形状の成形には比較的高度な成形技術を要するため、外側継手部材の輪郭が非円筒形状である等速自在継手への使用は円筒形状のものに比べて展開が遅れている。 When the outer peripheral surface shape of the opening of the outer joint member is a non-cylindrical surface shape, the inner peripheral surface of the large-diameter mounting portion of the boot attached to the outer joint member needs to be formed into a non-cylindrical shape along the outer peripheral surface shape. There is. However, with thermoplastic elastomer boots, a non-cylindrical shape consisting of a thick portion and a thin portion requires a relatively high level of molding technology, so that the contour of the outer joint member is a non-cylindrical constant velocity universal joint. The use of is delayed compared to the cylindrical one.
　そこで、従来には、非円筒形状の開口部に介在部材（中間部材）を外嵌し、この中間部材に、ブーツの大径取付部を外嵌固定するようにしたものが考案されている（特許文献１～特許文献３）。 Therefore, conventionally, an interposing member (intermediate member) is externally fitted to a non-cylindrical opening, and a large-diameter mounting portion of a boot is externally fixed to the intermediate member ( Patent Documents 1 to 3).
　すなわち、中間部材としては、外周面が円筒面とされ、内周面に、外側継手部材の非円筒面形状部の凹部に嵌合する内方膨出部を形成したリング体からなる。このため、等速自在継手の外側継手部材の開口部にこのような中間部材を嵌着（外嵌）することによって、円筒形状の大径取付部を有するブーツをそのまま用いることができる。すなわち、熱可塑性エラストマー製ブーツを非円筒形状の開口部に対応する形状とする必要がなくなる。 That is, the intermediate member is formed of a ring body in which the outer peripheral surface is a cylindrical surface, and the inner peripheral surface is formed with an inward bulging portion that fits into the recess of the non-cylindrical surface shape portion of the outer joint member. Therefore, a boot having a cylindrical large-diameter mounting portion can be used as it is by fitting (externally fitting) such an intermediate member into the opening of the outer joint member of the constant velocity universal joint. That is, the thermoplastic elastomer boot need not have a shape corresponding to the non-cylindrical opening.
特開２００５－２４０９６２号公報Japanese Patent Laid-Open No. 2005-240962 特開２００５－２２１０７８号公報JP 2005-221078 A 特開２００７－１２０５８０号公報JP 2007-120580 A
　しかしながら、前記のような中間部材を用いれば、中間部材はリング体であるため、このような中間部材にブーツの大径取付部を外嵌すれば、この外側継手部材への装着部の外径寸法が大きくなって必然的に最外径の大型化を招くことになる。 However, if the intermediate member as described above is used, the intermediate member is a ring body. Therefore, if the large-diameter mounting portion of the boot is externally fitted to such an intermediate member, the outer diameter of the mounting portion to this outer joint member The size becomes large, which inevitably increases the outermost diameter.
　そこで、本発明は斯かる実情に鑑み、最外径の大型化を抑えることができ、しかも、ブーツの大径取付部を円筒形状とした熱可塑性エラストマー製ブーツを用いることができて、耐久性及びシール性に優れた等速自在継手を提供しようとするものである。 Therefore, in view of such circumstances, the present invention can suppress the increase in the outermost diameter, and can use a boot made of a thermoplastic elastomer having a large-diameter mounting portion of the boot in a cylindrical shape. And a constant velocity universal joint excellent in sealing performance.
　本発明の等速自在継手は、外側継手部材と、この外側継手部材に収容される内側継手部材と、外側継手部材と内側継手部材との間に介在されるトルク伝達部材とを備え、前記外側継手部材は、前記内側継手部材が収容されるマウス部を有し、このマウス部は、横断面で見ると、大径部と小径部が交互に現れる非円筒形状であり、マウス部開口部において、中間部材を介して熱可塑性ポリエステル系エラストマーからなるブーツが外嵌固定される等速自在継手であって、前記外側継手部材のマウス部開口部においては、大径部では、開口端側の周方向凸部とこの周方向凸部よりも継手奥側の周方向凹部とが形成され、前記中間部材は、マウス部開口部に外嵌された際に、前記小径部に嵌合する厚肉部と、前記大径部の周方向凹部に嵌合して周方向に隣り合う厚肉部を連結する円弧状連結部とを有し、前記大径部の周方向凸部に対応する部位にはこの周方向凸部が嵌合する切欠部が形成されて、前記ブーツをこの中間部材に外嵌した状態で、前記切欠部を介してブーツの大径取付部の内周面が前記周方向凸部に接触するものである。 The constant velocity universal joint according to the present invention includes an outer joint member, an inner joint member accommodated in the outer joint member, and a torque transmission member interposed between the outer joint member and the inner joint member. The joint member has a mouth portion in which the inner joint member is accommodated, and the mouth portion has a non-cylindrical shape in which a large-diameter portion and a small-diameter portion appear alternately when viewed in a cross section. A constant velocity universal joint to which a boot made of a thermoplastic polyester elastomer is fitted and fixed via an intermediate member, wherein the mouth portion opening portion of the outer joint member has a peripheral portion on the opening end side at a large diameter portion. A thick-walled portion that fits into the small-diameter portion when the intermediate member is externally fitted to the mouth portion opening portion. And fitted into the circumferential recess of the large diameter portion. A circular arc connecting portion that connects adjacent thick portions in the direction, and a portion corresponding to the circumferential convex portion of the large diameter portion is formed with a notch portion into which the circumferential convex portion is fitted, In a state where the boot is fitted on the intermediate member, the inner peripheral surface of the large-diameter mounting portion of the boot contacts the circumferential convex portion via the notch portion.
　本発明の等速自在継手によれば、中間部材は、その厚肉部が外側継手部材の小径部に嵌合し、その円弧状連結部が大径部の周方向凹部に嵌合するので、外側継手部材のマウス部のブーツ装着部（開口端部）に安定して装着できる。また、中間部材の外周面が円筒面形状とされた短円筒形状体であるので、この中間部材に、短円筒部とされたブーツの大径取付部を外嵌させることによって、大径取付部の内周面と中間部材の外周面とを密接させることができる。しかも、中間部材には、大径部の周方向凸部に対応する部位にはこの周方向凸部が嵌合する切欠部が形成されているので、中間部材にブーツの大径取付部を外嵌させた状態で、大径取付部の内周面を周方向凸部に接触させることができ、さらにはこの状態では、円弧状連結部が大径部の周方向凹部に嵌合している。このため、ブーツが装着された状態であっても、最外径を小さく抑えることができる。 According to the constant velocity universal joint of the present invention, the intermediate member has its thick portion fitted into the small diameter portion of the outer joint member, and its arcuate connection portion fits into the circumferential recess of the large diameter portion. It can be stably mounted on the boot mounting portion (open end portion) of the mouse portion of the outer joint member. Moreover, since the outer peripheral surface of the intermediate member is a short cylindrical body having a cylindrical surface shape, the large-diameter mounting portion can be obtained by externally fitting the large-diameter mounting portion of the boot, which is a short cylindrical portion, to the intermediate member. Can be brought into close contact with the outer peripheral surface of the intermediate member. In addition, since the intermediate member has a notch for fitting the circumferential convex portion at a portion corresponding to the circumferential convex portion of the large diameter portion, the large diameter mounting portion of the boot is attached to the intermediate member. In the fitted state, the inner peripheral surface of the large-diameter mounting portion can be brought into contact with the circumferential convex portion, and in this state, the arc-shaped connecting portion is fitted in the circumferential concave portion of the large-diameter portion. . For this reason, even when the boot is mounted, the outermost diameter can be kept small.
　前記中間部材をマウス部開口部に外嵌した状態において、中間部材の外周面の外径寸法が前記大径部の周方向凸部の外径寸法と同一乃至前記大径部の周方向凸部の外径寸法よりも僅かに大きく設定できる。このように設定することによって、ブーツバンドにてブーツの大径取付部を締め付けた際に、緊縛力を安定させることができる。 In a state where the intermediate member is externally fitted to the mouth portion opening, the outer diameter of the outer peripheral surface of the intermediate member is the same as the outer diameter of the circumferential protrusion of the large diameter portion or the circumferential protrusion of the large diameter portion. It can be set to be slightly larger than the outer diameter dimension. By setting in this way, the binding force can be stabilized when the large-diameter mounting portion of the boot is tightened with the boot band.
　前記中間部材をマウス部開口部に外嵌した状態において、中間部材の厚肉部の外径寸法が、中間部材の円弧状連結部の外径寸法よりも僅かに大きいものであってもよい。このように設定することによって、ブーツバンドにてブーツの大径取付部を締め付けた際、この厚肉部の変形量が大となるため、緊縛力を安定させることができる。 In the state in which the intermediate member is externally fitted to the mouth portion opening, the outer diameter of the thick portion of the intermediate member may be slightly larger than the outer diameter of the arc-shaped connecting portion of the intermediate member. By setting in this way, when the large-diameter mounting portion of the boot is tightened with the boot band, the deformation amount of the thick-walled portion becomes large, so that the binding force can be stabilized.
　中間部材の内周面に前記周方向凹溝の底面に圧接する周方向内凸条を少なくとも１つ設けたものであっても、中間部材の外周面にブーツの大径取付部の内周面に圧接する周方向外凸条を少なくとも１つ設けたものであってもよい。 Even if the inner circumferential surface of the intermediate member is provided with at least one circumferential inner ridge that presses against the bottom surface of the circumferential groove, the inner circumferential surface of the large-diameter mounting portion of the boot is provided on the outer circumferential surface of the intermediate member. There may be provided at least one circumferential outer ridge that presses against the outer circumferential surface.
　また、前記周方向凹溝の底面に圧接する２つの周方向内凸条を中間部材の内周面に軸方向に所定間隔で設けるとともに、中間部材の外周面に１つの周方向外凸条を前記２つの周方向内凸条の中間部位に対応する部位に設けたものであってもよい。前記周方向内凸条および前記周方向外凸条は、外側継手部材の円周方向に連続した凸条とする。さらには、中間部材の厚肉部の内周面における外側継手部材の周方向凸部の軸方向対応部位に周方向内凸条を設けてもよい。この周方向内凸部は、円周方向に不連続である。 In addition, two circumferential inner ridges that are pressed against the bottom surface of the circumferential groove are provided at predetermined intervals in the axial direction on the inner circumferential surface of the intermediate member, and one circumferential outer ridge is provided on the outer circumferential surface of the intermediate member. You may provide in the site | part corresponding to the intermediate site | part of the said 2 circumferential direction internal protrusion. The circumferential inner ridge and the circumferential outer ridge are ridges continuous in the circumferential direction of the outer joint member. Furthermore, you may provide a circumferential inner convex line in the axial direction corresponding | compatible part of the circumferential convex part of the outer joint member in the inner peripheral surface of the thick part of an intermediate member. This circumferential inner convex portion is discontinuous in the circumferential direction.
　ブーツの大径取付部には、その外周面にブーツバンドが装着される周方向凹溝が形成されるとともに、その内周面の前記周方向凹溝の軸方向中間対応部に周方向膨出部が形成され、前記外側継手部材の周方向凸部と前記中間部材の円弧状連結部との間に第１周方向溝が形成されるとともに、中間部材の厚肉部の外周面における前記第１周方向溝の軸方向対応位置に第２周方向溝が形成され、第１周方向溝と第２周方向溝とが周方向に連続する周方向嵌合溝を構成し、この周方向嵌合溝に前記ブーツの大径取付部の周方向膨出部が嵌合するものであることが好ましい。この際、中間部材の厚肉部の外周面の縦断面形状と、前記外側継手部材の周方向凸部乃至中間部材の円弧状連結部の外周面の縦断面形状とが略同一形状であるようにできる。 The large-diameter mounting portion of the boot is formed with a circumferential concave groove in which a boot band is mounted on the outer peripheral surface thereof, and is circumferentially bulged in an axial intermediate corresponding portion of the circumferential concave groove on the inner peripheral surface thereof. A first circumferential groove is formed between the circumferential convex portion of the outer joint member and the arc-shaped coupling portion of the intermediate member, and the first circumferential groove on the outer circumferential surface of the thick portion of the intermediate member is formed. A second circumferential groove is formed at a position corresponding to the axial direction of the one circumferential groove, and the first circumferential groove and the second circumferential groove constitute a circumferential fitting groove that is continuous in the circumferential direction. It is preferable that a circumferential bulge portion of the large-diameter mounting portion of the boot is fitted in the groove. At this time, the vertical cross-sectional shape of the outer peripheral surface of the thick portion of the intermediate member and the vertical cross-sectional shape of the outer peripheral surface of the outer circumferential member of the outer joint member or the arc-shaped connecting portion of the intermediate member seem to be substantially the same shape. Can be.
　前記外側継手部材の大径部の周方向凹部と小径部とはエッジ部を介して接合され、中間部材が装着された状態で、前記エッジ部がこの中間部材における円弧状連結部と厚肉部との境界部に食い込むのが好ましい。 The circumferential concave portion and the small diameter portion of the large-diameter portion of the outer joint member are joined via an edge portion, and the edge portion is connected to the arcuate connection portion and the thick-walled portion in the intermediate member with the intermediate member attached. It is preferable to bite into the boundary part.
　本発明では、最外径を最小限に抑えた上で、ブーツの大径取付部が円筒形状をした熱可塑性エラストマー製ブーツを等速自在継手の外側継手部材に装着することができる。このため、外側継手部材に対するブーツの大径取付部の装着性、位置決め安定性を向上させ、かつ、安定したシール性を確保することを容易にする。そして、熱可塑性エラストマー製ブーツを適用できることにより、クロロプレンラバー製ブーツに比べて耐久性が向上し、ブーツ性能の信頼性が向上する。 In the present invention, the thermoplastic elastomer boot having the cylindrical shape of the large-diameter mounting portion of the boot can be attached to the outer joint member of the constant velocity universal joint while minimizing the outermost diameter. For this reason, it is easy to improve the mounting property and positioning stability of the large-diameter mounting portion of the boot with respect to the outer joint member, and to ensure stable sealing performance. And since the boot made from a thermoplastic elastomer can be applied, durability improves compared with the boot made from a chloroprene rubber, and the reliability of boot performance improves.
本発明の実施形態を示す等速自在継手の縦断面図である。It is a longitudinal cross-sectional view of the constant velocity universal joint which shows embodiment of this invention. 前記図１に示す等速自在継手の横断面図である。It is a cross-sectional view of the constant velocity universal joint shown in FIG. 前記図１に示す等速自在継手の外側継手部材の縦断面図である。It is a longitudinal cross-sectional view of the outer joint member of the constant velocity universal joint shown in the said FIG. 前記図１のＸ－Ｘ線断面図である。FIG. 2 is a sectional view taken along line XX of FIG. 前記図１のＹ－Ｙ線断面図である。FIG. 2 is a cross-sectional view taken along line YY in FIG. 前記図１に示す等速自在継手に用いる中間部材の正面図である。It is a front view of the intermediate member used for the constant velocity universal joint shown in the said FIG. 前記図１に示す等速自在継手に用いる中間部材の側面図である。It is a side view of the intermediate member used for the constant velocity universal joint shown in the said FIG. 前記図１に示す等速自在継手の要部拡大断面図である。It is a principal part expanded sectional view of the constant velocity universal joint shown in the said FIG. 前記図１に示す等速自在継手の図７とは相違する部位の要部拡大断面図である。It is a principal part expanded sectional view of the site | part different from FIG. 7 of the constant velocity universal joint shown in the said FIG. 前記図１に示す等速自在継手に用いる中間部材の要部拡大断面図である。It is a principal part expanded sectional view of the intermediate member used for the constant velocity universal joint shown in the said FIG. 前記図１に示す等速自在継手に用いる中間部材の図９とは相違する部位の要部拡大断面図である。It is a principal part expanded sectional view of the site | part different from FIG. 9 of the intermediate member used for the constant velocity universal joint shown in the said FIG. 前記図１に示す中間部材の装着前の要部拡大横断面図である。It is a principal part expanded horizontal sectional view before mounting | wearing of the intermediate member shown in the said FIG. 前記図１に示す中間部材の装着後の要部拡大横断面図である。FIG. 2 is an enlarged cross-sectional view of a main part after the intermediate member shown in FIG. 1 is mounted.
  以下、本発明の実施形態を図面に従って説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１と図２は本発明に係るトリポード型等速自在継手を示し、トリポード型等速自在継手は、外側継手部材１と、内側継手部材としてのトリポード部材２と、トルク伝達部材３とを備える。 1 and 2 show a tripod type constant velocity universal joint according to the present invention. The tripod type constant velocity universal joint includes an outer joint member 1, a tripod member 2 as an inner joint member, and a torque transmission member 3. .
　外側継手部材１は一端にて開口したカップ状のマウス部４と、マウス部４の底壁から突設されるステム部５を有し、内周の円周方向三等分位置に軸方向に延びるトラック溝６が形成してある。マウス部４は、横断面で見ると、大径部４ａと小径部４ｂが交互に現れる非円筒形状である。すなわち、マウス部４は、大径部４ａと小径部４ｂとを形成することによって、その内周面に、軸方向に延びる３本の前記トラック溝６が形成される。 The outer joint member 1 has a cup-shaped mouth portion 4 opened at one end, and a stem portion 5 projecting from the bottom wall of the mouth portion 4, and is axially located at a three-way position in the circumferential direction of the inner circumference. An extending track groove 6 is formed. The mouse part 4 has a non-cylindrical shape in which the large diameter part 4a and the small diameter part 4b appear alternately when viewed in cross section. That is, the mouse portion 4 is formed with the large-diameter portion 4a and the small-diameter portion 4b, whereby the three track grooves 6 extending in the axial direction are formed on the inner peripheral surface thereof.
　各トラック溝６の円周方向で向き合った側壁にローラ案内面（ローラ摺接面）７、７が形成される。また、内周面においては、円周方向に交互に現れる小内径部１２と大内径部１３をローラ案内面７で接続した３弁の花冠状を呈している。すなわち、外側継手部材１は、円周方向に向き合ったローラ案内面７と両ローラ案内面７，７間に設けられた大内径部１３からなるトラック溝６が内周の三箇所に形成されるものである。 Roller guide surfaces (roller contact surfaces) 7 and 7 are formed on the side walls facing each other in the circumferential direction of each track groove 6. Further, the inner peripheral surface has a three-valve corollary shape in which the small inner diameter portion 12 and the large inner diameter portion 13 that appear alternately in the circumferential direction are connected by the roller guide surface 7. That is, in the outer joint member 1, the track groove 6 composed of the roller guide surface 7 facing in the circumferential direction and the large inner diameter portion 13 provided between the roller guide surfaces 7, 7 is formed at three locations on the inner periphery. Is.
　トリポード部材２はボス８と脚軸９とを備える。ボス８にはシャフト１０とトルク伝達可能に結合する雌スプライン１１が形成してある。脚軸９はボス８の円周方向三等分位置から半径方向に突出している。 The tripod member 2 includes a boss 8 and a leg shaft 9. The boss 8 is formed with a female spline 11 coupled to the shaft 10 so as to be able to transmit torque. The leg shaft 9 protrudes in the radial direction from the circumferentially divided position of the boss 8.
　各脚軸９は、円筒形外周面１４と、軸端付近に形成された環状の輪溝１６を備えている。脚軸９の外周に複数の針状ころ１７を介して回転自在にトルク伝達部材３を構成するローラ部材２０を外嵌している。脚軸９の円筒形外周面１４は針状ころ１７の内側軌道面を提供する。ローラ部材２０の内周面は円筒形で、針状ころ１７の外側軌道面を提供する。 Each leg shaft 9 includes a cylindrical outer peripheral surface 14 and an annular ring groove 16 formed in the vicinity of the shaft end. A roller member 20 constituting the torque transmission member 3 is externally fitted to the outer periphery of the leg shaft 9 via a plurality of needle rollers 17. The cylindrical outer peripheral surface 14 of the leg shaft 9 provides the inner raceway surface of the needle roller 17. The inner peripheral surface of the roller member 20 is cylindrical and provides the outer raceway surface of the needle roller 17.
　針状ころ１７は脚軸９の半径方向で見た外側の端面にてアウタ・ワッシャ２１と接し、反対側の端面にてインナ・ワッシャ２２と接している。アウタ・ワッシャ２１は輪溝１６に装着されたサークリップ２３によって軸方向移動を規制されているため、結局、針状ころ１７も軸方向移動を規制される。 The needle roller 17 is in contact with the outer washer 21 at the outer end face viewed in the radial direction of the leg shaft 9, and is in contact with the inner washer 22 at the opposite end face. Since the outer washer 21 is restricted from moving in the axial direction by the circlip 23 attached to the ring groove 16, the needle roller 17 is also restricted from moving in the axial direction.
　トリポード部材２の雌スプライン１１には、シャフト（軸部材）１０の端部雄スプライン２５が嵌入され、この雌スプライン１１と端部雄スプライン２５とが嵌合する。また、端部雄スプライン２５の先端部及び基端部には、抜け止め用の止め輪２６が装着されている。 The male spline 25 of the end of the shaft (shaft member) 10 is fitted into the female spline 11 of the tripod member 2, and the female spline 11 and the male male spline 25 are fitted. Further, a retaining ring 26 for retaining is attached to the distal end portion and the proximal end portion of the end male spline 25.
　ところで、外側継手部材１の開口部はブーツ３０によって密封される。そのため、外側継手部材１の外周面の開口部側（マウス部４の開口部）には、ブーツ装着部３１が形成される。そして、このブーツ装着部３１に、後述する中間部材５０を介してブーツ３０が外嵌され、ブーツバンド３２にて締め付けることになる。 Incidentally, the opening of the outer joint member 1 is sealed by the boot 30. Therefore, a boot mounting portion 31 is formed on the opening side of the outer peripheral surface of the outer joint member 1 (opening portion of the mouse portion 4). Then, the boot 30 is fitted on the boot mounting portion 31 via an intermediate member 50 described later, and is tightened by the boot band 32.
　ブーツ３０は、大径部取付部３０ａと、小径取付部３０ｂと、大径取付部３０ａと小径取付部３０ｂとを連結する屈曲及び伸縮が可能な蛇腹部（連結部）３０ｃとからなる。このブーツ３０の材質に、ＪＩＳ　Ｋ　６２５３に規定されるタイプＤデュロメータによる硬さが３５以上５０以下である熱可塑性ポリエステル系エラストマーを用いている。熱可塑性ポリエステル系エラストマーは、加硫ゴムのような非常に柔軟な材料と、熱可塑性樹脂のような高剛性な材料との中間の弾性率を持つ材料である。この熱可塑性ポリエステル系エラストマーは、加硫ゴムと熱可塑性樹脂の両者の特徴を有し、変形を受けても、元の形状に復元するゴム弾性、加硫ゴムより高い機械的強度、一般的な熱可塑性樹脂に適用される成形加工法が適用できる熱可塑性などの特徴を示す材料である。 The boot 30 includes a large-diameter portion attaching portion 30a, a small-diameter attaching portion 30b, and a bellows portion (connecting portion) 30c that can be bent and stretched to connect the large-diameter attaching portion 30a and the small-diameter attaching portion 30b. The boot 30 is made of a thermoplastic polyester elastomer having a hardness of 35 or more and 50 or less according to a type D durometer defined in JIS K 6253. A thermoplastic polyester elastomer is a material having an elastic modulus intermediate between a very flexible material such as vulcanized rubber and a highly rigid material such as a thermoplastic resin. This thermoplastic polyester-based elastomer has the characteristics of both vulcanized rubber and thermoplastic resin. Even when it is deformed, it has rubber elasticity that restores its original shape, higher mechanical strength than vulcanized rubber, It is a material exhibiting characteristics such as thermoplasticity to which a molding method applied to a thermoplastic resin can be applied.
　ところで、外側継手部材１のマウス部開口端外周面においては、大径部４ａでは、図３と図７等に示すように、開口端側の周方向凸部３５とこの周方向凸部３５よりも継手奥側の周方向凹部３６とが形成されて、前記ブーツ装着部３１が構成される。 By the way, on the outer peripheral surface of the mouth portion opening end of the outer joint member 1, the large-diameter portion 4 a has a circumferential convex portion 35 on the opening end side and the circumferential convex portion 35, as shown in FIGS. 3 and 7. Also, the boot mounting portion 31 is formed by forming a circumferential recess 36 on the back side of the joint.
　この場合、大径部４ａの開口端外周面に、図７に示すように、テーパ面(傾斜面)３８ａとアール部３８ｂとからなる面取部３８が形成され、また、大径部４ａの開口端側外周面に、周方向凹部３６が形成され、この周方向凹部３６と面取部３８との間に周方向凸部３５が形成される。周方向凹部３６は、所定深さをなす底面３７と、開口側のテーパ部３６ｂと、継手奥側のテーパ面３６ｃとからなる。このため、周方向凸部３５は、縦断面形状が台形状とされる。テーパ面３８ａのテーパ角θ（継手軸線に対する傾斜角度）として、２５°以上６０°以下に設定するのが好ましく、さらには、２５°以上４５°以下に設定するのが好ましい。また、小径部４ｂでは、周方向全範囲が縦断面直線状をなし、横断面形状では円弧形状をなす。 In this case, as shown in FIG. 7, a chamfered portion 38 composed of a tapered surface (inclined surface) 38a and a rounded portion 38b is formed on the outer peripheral surface of the large diameter portion 4a. A circumferential recessed portion 36 is formed on the outer peripheral surface on the opening end side, and a circumferential protruding portion 35 is formed between the circumferential recessed portion 36 and the chamfered portion 38. The circumferential recess 36 includes a bottom surface 37 having a predetermined depth, an opening-side taper portion 36b, and a joint back-side taper surface 36c. For this reason, the circumferential projection 35 has a trapezoidal longitudinal cross-sectional shape. The taper angle θ (inclination angle with respect to the joint axis) of the tapered surface 38a is preferably set to 25 ° or more and 60 ° or less, and more preferably set to 25 ° or more and 45 ° or less. Further, in the small diameter portion 4b, the entire circumferential range has a straight vertical cross section, and the cross sectional shape has an arc shape.
　ブーツ３０の大径取付部３０ａは短円筒形状をなし、図１と図７に示すように、その外周面にブーツバンド３２が装着される周方向凹溝４０が形成される。大径取付部３０ａの内周面には、その軸方向中間対応部に周方向膨出部４２が形成されている。 The large-diameter mounting portion 30a of the boot 30 has a short cylindrical shape, and as shown in FIGS. 1 and 7, a circumferential groove 40 in which the boot band 32 is mounted is formed on the outer peripheral surface thereof. On the inner peripheral surface of the large-diameter mounting portion 30a, a circumferential bulging portion 42 is formed at the axially corresponding intermediate portion.
　ブーツ３０の小径取付部３０ｂは短円筒形状をなし、図１に示すように、その外周面にブーツバンド３２が装着される周方向凹溝４３が形成される。小径取付部３０ｂの内周面には、その軸方向中間対応部に周方向膨出部４４が形成されている。また、この小径取付部３０ｂはシャフト（軸部材）１０のブーツ装着部４５に外嵌される。ブーツ装着部４５は、周方向凹溝４６と、この周方向凹溝４６の両端部に設けられる周方向凸条４７，４７とを備える。このため、小径取付部３０ｂをシャフト（軸部材）１０のブーツ装着部４５に外嵌した状態で、周方向凹溝４３にブーツバンド３２を装着して、このブーツバンド３２を締め付ければ、周方向凹溝４６に周方向膨出部４４が嵌合するとともに、周方向凸条４７，４７が小径取付部３０ｂの内径面に食い込むことになって、小径取付部３０ｂはブーツ装着部４５に固定される。 The small-diameter mounting portion 30b of the boot 30 has a short cylindrical shape, and a circumferential groove 43 in which the boot band 32 is mounted is formed on the outer peripheral surface thereof as shown in FIG. On the inner peripheral surface of the small-diameter mounting portion 30b, a circumferential bulging portion 44 is formed at the axially corresponding intermediate portion. The small-diameter mounting portion 30 b is fitted on the boot mounting portion 45 of the shaft (shaft member) 10. The boot mounting portion 45 includes a circumferential groove 46 and circumferential ridges 47 provided at both ends of the circumferential groove 46. For this reason, if the boot band 32 is attached to the circumferential groove 43 and the boot band 32 is tightened with the small-diameter attachment portion 30b externally fitted to the boot attachment portion 45 of the shaft (shaft member) 10, The circumferential bulging portion 44 is fitted into the directional groove 46, and the circumferential ridges 47 and 47 bite into the inner diameter surface of the small diameter mounting portion 30b, so that the small diameter mounting portion 30b is fixed to the boot mounting portion 45. Is done.
　ところで、大径取付部３０ａ側では、この大径取付部３０ａに中間部材５０が内嵌された状態で外側継手部材１のブーツ装着部３１に装着されることになる。中間部材５０は、樹脂やゴムや熱可塑性エラストマーを用いることができる。すなわち、ブーツに必要な疲労性や摩耗性、低温性などの性能を保持していなくても使用可能なため、任意の材料を選択することができる。勿論、ブーツに使用可能な材料を選択しても良い。なお、中間部材５０は、一体に成形されたものであっても良いし、円周方向に分割された形態のものを組み合わせて適用しても良い。例えば、外側継手部材１のブーツ装着部３１に中間部材５０を装着する際に、装着するための変形を許容できない材料を選択した場合は、円周方向に分割された形態の中間部材５０を適用すると良い。 By the way, on the large-diameter attachment portion 30a side, the intermediate member 50 is fitted into the large-diameter attachment portion 30a and attached to the boot attachment portion 31 of the outer joint member 1. The intermediate member 50 can be made of resin, rubber, or thermoplastic elastomer. In other words, any material can be selected because it can be used even if it does not maintain performances such as fatigue, wear and low temperature required for the boot. Of course, you may select the material which can be used for boots. In addition, the intermediate member 50 may be integrally formed, or may be applied in combination with a form divided in the circumferential direction. For example, when the intermediate member 50 is mounted on the boot mounting portion 31 of the outer joint member 1 and a material that cannot be deformed for mounting is selected, the intermediate member 50 divided in the circumferential direction is applied. Good.
　中間部材５０は、図６Ａ及び図６Ｂに示すように、薄肉の円弧状連結部６１を含むリング部５０ａと、周方向に沿って１２０°ピッチで配設される突出部５０ｂとからなる。この場合、リング部５０ａの一方の軸方向端部にテーパ部５１ａが形成され、この軸方向端面に前記突出部５０ｂが連設されている。突出部５０ｂは、その内周面は、外側継手部材１の小径部４ｂに嵌合する円弧形状とされ、その外周面は、外端側の第１テーパ円弧部５２ａと、この第１テーパ円弧部５２ａに連設される第１円弧面部５２ｂと、第１円弧面部５２ｂを介して第１テーパ円弧部５２ａと反対側に第２テーパ円弧部５２ｃと、この第２テーパ円弧部５２ｃと前記テーパ部５１ａとの間の第２円弧面部５２ｄとが形成される。また、第１テーパ円弧部５２ａと突出部５０ｂの外端面とのコーナ部にアール部５２ｅ（図８等参照）が形成されている。 As shown in FIGS. 6A and 6B, the intermediate member 50 includes a ring portion 50a including a thin arc-shaped connecting portion 61 and protrusions 50b disposed at a 120 ° pitch in the circumferential direction. In this case, the taper part 51a is formed in one axial direction edge part of the ring part 50a, and the said protrusion part 50b is provided in a row by this axial direction end surface. The projecting portion 50b has an inner circumferential surface that has an arc shape that fits into the small-diameter portion 4b of the outer joint member 1, and an outer circumferential surface that includes the first tapered arc portion 52a on the outer end side and the first tapered arc. A first arcuate surface part 52b provided continuously with the part 52a, a second taper arcuate part 52c on the opposite side of the first taper arcuate part 52a via the first arcuate surface part 52b, the second taper arcuate part 52c and the taper. A second arcuate surface part 52d between the part 51a and the part 51a is formed. Further, a rounded portion 52e (see FIG. 8 and the like) is formed at a corner portion between the first tapered arc portion 52a and the outer end surface of the protruding portion 50b.
　このように構成された中間部材５０を、外側継手部材１のブーツ装着部３１に装着（外嵌）すれば、各突出部５０ｂは各小径部４ｂに嵌合することになる。また、図７に示すように、大径部４ａにおいては、リング部５０ａの円弧状連結部６１が周方向凹部３６に嵌合する。この際、リング部５０ａの円弧状連結部６１は、他方の軸方向端部には、図７に示すように、テーパ部５１ｂが形成され、このテーパ部５１ｂが周方向凹部３６のテーパ面３６ｃに密接する。また、このリング部５０ａの円弧状連結部６１と、周方向凸部３５との間に周方向溝５３が形成される。すなわち、テーパ部３６ｂと底面３７とテーパ部５１ａとで、この周方向溝５３が形成される。 When the intermediate member 50 configured in this manner is mounted (externally fitted) to the boot mounting portion 31 of the outer joint member 1, each protruding portion 50b is fitted to each small diameter portion 4b. Further, as shown in FIG. 7, in the large diameter portion 4 a, the arc-shaped connecting portion 61 of the ring portion 50 a is fitted into the circumferential recess 36. At this time, the arc-shaped connecting portion 61 of the ring portion 50a is formed with a tapered portion 51b at the other axial end, as shown in FIG. 7, and this tapered portion 51b is a tapered surface 36c of the circumferential recess 36. Close to. In addition, a circumferential groove 53 is formed between the arc-shaped connecting portion 61 of the ring portion 50 a and the circumferential convex portion 35. That is, the circumferential groove 53 is formed by the tapered portion 36b, the bottom surface 37, and the tapered portion 51a.
　中間部材５０が外側継手部材１のブーツ装着部３１に装着された状態では、小径部４ｂにおいては、図８に示すように、第２テーパ円弧部５２ｃと第２円弧面部５２ｄとテーパ部５１ａとで、周方向溝５４が形成される。そして、この周方向溝５４と前記周方向溝５３とが周方向に連続する周方向嵌合溝５５を構成する。このように、中間部材５０は、突出部５０ｂと、これに軸方向に対応するリング部５０ａの一部とで、マウス部開口部に外嵌された際に小径部４ｂに嵌合する厚肉部６０を形成する。また、リング部５０ａにおいて厚肉部６０間が、大径部４ａの周方向凹部３６に嵌合して周方向に隣り合う厚肉部を連結される円弧状連結部６１を形成することになる。このため、周方向に隣合う突出部５０ｂ間においては、継手開口側には部材がないことになる。中間部材５０が外側継手部材１のブーツ装着部３１に装着された状態では、外側継手部材１の周方向凸部３５が嵌合する切欠部６２が設けられることになる。 In the state where the intermediate member 50 is mounted on the boot mounting portion 31 of the outer joint member 1, the small diameter portion 4b includes a second tapered arc portion 52c, a second arc surface portion 52d, and a tapered portion 51a as shown in FIG. Thus, the circumferential groove 54 is formed. The circumferential groove 54 and the circumferential groove 53 constitute a circumferential fitting groove 55 that is continuous in the circumferential direction. As described above, the intermediate member 50 includes the protruding portion 50b and a part of the ring portion 50a corresponding to the axial direction, and the intermediate member 50 is fitted to the small diameter portion 4b when the intermediate member 50 is externally fitted to the mouth portion opening. A portion 60 is formed. In addition, between the thick portions 60 in the ring portion 50a, an arcuate connecting portion 61 is formed which is fitted in the circumferential recess 36 of the large diameter portion 4a and connects the thick portions adjacent in the circumferential direction. . For this reason, there is no member on the joint opening side between the protrusions 50b adjacent in the circumferential direction. In a state in which the intermediate member 50 is mounted on the boot mounting portion 31 of the outer joint member 1, a notch 62 in which the circumferential convex portion 35 of the outer joint member 1 is fitted is provided.
　この場合、中間部材５０の厚肉部６０の外周面の縦断面形状と、周方向凸部３５乃至中間部材５０の円弧状連結部６１の連続する外周面の縦断面形状とが略同一形状であるように設定できる。 In this case, the vertical cross-sectional shape of the outer peripheral surface of the thick portion 60 of the intermediate member 50 and the vertical cross-sectional shape of the outer peripheral surface where the arc-shaped connecting portion 61 of the intermediate member 50 continues are substantially the same shape. It can be set to be.
　このように、構成された中間部材５０が外側継手部材１のブーツ装着部３１に装着された状態で、ブーツ３０の大径取付部３０ａをこの中間部材５０に外嵌すれば、大径取付部３０ａの周方向膨出部４２が、周方向溝５３と周方向溝５４とで構成される周方向嵌合溝５５に嵌合することになる。 If the large-diameter mounting portion 30a of the boot 30 is externally fitted to the intermediate member 50 in a state where the thus configured intermediate member 50 is mounted on the boot mounting portion 31 of the outer joint member 1, the large-diameter mounting portion The circumferential bulging portion 42 of 30 a is fitted into a circumferential fitting groove 55 constituted by a circumferential groove 53 and a circumferential groove 54.
　この場合、中間部材５０をマウス部開口部に外嵌した状態において、中間部材５０の外周面の外径寸法Ｄ１（図５参照）が大径部４ａの周方向凸部３５の外径寸法Ｄ２(図７参照)と同一乃至前記大径部４ａの周方向凸部３５の外径寸法Ｄ２よりも僅かに大きいように設定している。この場合、中間部材５０の厚肉部６０の外径寸法Ｄ３(図５参照)と中間部材５０の円弧状連結部６１の外径寸法Ｄ４(図５参照)とを同一に設定している。 In this case, the outer diameter D1 (see FIG. 5) of the outer peripheral surface of the intermediate member 50 is the outer diameter D2 of the circumferential convex portion 35 of the large diameter portion 4a in a state in which the intermediate member 50 is externally fitted to the mouth portion opening. Same as (see FIG. 7) or set to be slightly larger than the outer diameter D2 of the circumferential convex portion 35 of the large diameter portion 4a. In this case, the outer diameter D3 (see FIG. 5) of the thick portion 60 of the intermediate member 50 and the outer diameter D4 (see FIG. 5) of the arc-shaped connecting portion 61 of the intermediate member 50 are set to be the same.
　また、中間部材５０をマウス部開口部に外嵌した状態において、中間部材５０の厚肉部６０の外径寸法Ｄ３が、中間部材５０の円弧状連結部６１の外径寸法Ｄ４よりも僅かに大きいように設定してもよい。 Further, in the state in which the intermediate member 50 is externally fitted to the mouth portion opening, the outer diameter dimension D3 of the thick portion 60 of the intermediate member 50 is slightly smaller than the outer diameter dimension D4 of the arc-shaped connecting portion 61 of the intermediate member 50. You may set so that it may be large.
　ブーツ３０の大径取付部３０ａが外嵌された状態では、大径取付部３０ａの内周面と中間部材５０の円弧状連結部６１の外周面とが直接的に接触することになる。このため、この状態で、大径取付部３０ａの外周面の周方向凹溝４０にブーツバンド３２を締め付けると（縮径させると）、周方向膨出部４２が周方向嵌合溝５５に固定されるとともに、大径取付部３０ａの内周面が中間部材５０の円弧状連結部６１の外周面に密着（圧接）する。このため、ブーツ３０の大径取付部３０ａは、中間部材５０を介して外側継手部材１のブーツ装着部３１に安定した状態で固定されることになる。 In the state where the large-diameter mounting portion 30a of the boot 30 is externally fitted, the inner peripheral surface of the large-diameter mounting portion 30a and the outer peripheral surface of the arc-shaped connecting portion 61 of the intermediate member 50 are in direct contact. Therefore, in this state, when the boot band 32 is tightened (reduced in diameter) in the circumferential concave groove 40 on the outer peripheral surface of the large-diameter mounting portion 30 a, the circumferential bulge portion 42 is fixed to the circumferential fitting groove 55. At the same time, the inner peripheral surface of the large-diameter mounting portion 30 a is in close contact (pressure contact) with the outer peripheral surface of the arc-shaped connecting portion 61 of the intermediate member 50. For this reason, the large-diameter mounting portion 30 a of the boot 30 is fixed in a stable state to the boot mounting portion 31 of the outer joint member 1 via the intermediate member 50.
　外側継手部材１は鉄などの金属製であり、中間部材５０は、樹脂やゴムや熱可塑性エラストマー等であることから中間部材５０の変形量が大きくなる。このため、ブーツ３０を装着してブーツバンド３２などの締結部材で固定する際に、中間部材５０の外周面の外径寸法Ｄ１が大径部４ａの周方向凸部３５の外径寸法Ｄ２と同一乃至前記大径部４ａの周方向凸部３５の外径寸法Ｄ２よりも僅かに大きいように設定した。すなわち、中間部材５０の外周面の外径は、外側継手部材１の周方向凸部３５の外径の１倍～１．０２倍が望ましい。 The outer joint member 1 is made of metal such as iron, and the intermediate member 50 is made of resin, rubber, thermoplastic elastomer, or the like, so that the deformation amount of the intermediate member 50 increases. For this reason, when the boot 30 is mounted and fixed with a fastening member such as the boot band 32, the outer diameter D1 of the outer peripheral surface of the intermediate member 50 is equal to the outer diameter D2 of the circumferential convex portion 35 of the large diameter portion 4a. It was set to be slightly larger than the outer diameter D2 of the circumferential convex portion 35 of the same or large diameter portion 4a. That is, the outer diameter of the outer peripheral surface of the intermediate member 50 is desirably 1 to 1.02 times the outer diameter of the circumferential protrusion 35 of the outer joint member 1.
　また、中間部材５０の円弧状連結部６１より厚肉部６０の方がブーツ３０を装着してブーツバンド３２などの締結部材で固定した際の変形量が大きい。そこで、外径寸法Ｄ３を外径寸法Ｄ４よりも僅かに大きくすることによって、緊縛力を均一に保つ。従って、この場合の中間部材５０の外形は、真円では無く、オムスビ形状の様な略円筒形状になる。厚肉部６０の外径(最大)は、円弧状連結部６１の外径の１倍～１．０５倍が望ましい。１．０５倍を越えると、円弧状連結部６１と厚肉部６０に掛かる緊縛力の不均一が発生する。なお、厚肉部６０の外形は、円筒であっても良いし、中央部分が厚くて両端部（円弧状連結部６１との接合部）が薄い凸状であっても良い。 Further, the thick portion 60 has a larger deformation amount when the boot 30 is mounted and fixed with a fastening member such as the boot band 32 than the arc-shaped connecting portion 61 of the intermediate member 50. Accordingly, the binding force is kept uniform by making the outer diameter D3 slightly larger than the outer diameter D4. Accordingly, the outer shape of the intermediate member 50 in this case is not a perfect circle but a substantially cylindrical shape such as a mussel shape. The outer diameter (maximum) of the thick part 60 is preferably 1 to 1.05 times the outer diameter of the arcuate connecting part 61. If it exceeds 1.05 times, non-uniformity of the binding force applied to the arc-shaped connecting part 61 and the thick part 60 occurs. The outer shape of the thick portion 60 may be a cylinder, or may be a convex shape with a thick central portion and thin end portions (joined portions with the arc-shaped connecting portion 61).
　本発明の等速自在継手によれば、中間部材５０は、その厚肉部６０が外側継手部材１の小径部４ｂに嵌合し、その円弧状連結部６１が大径部４ａの周方向凹部３６に嵌合するので、外側継手部材１のマウス部４のブーツ装着部（開口端部）３１に安定して装着できる。また、中間部材５０の外周面が円筒面形状とされた短円筒形状体であるので、この中間部材５０に、短円筒部とされたブーツ３０の大径取付部３０ａを外嵌させることによって、大径取付部３０ａの内周面と中間部材５０の外周面とを密接させることができる。しかも、中間部材５０には、大径部４ａの周方向凸部３５に対応する部位にはこの周方向凸部３５が嵌合する切欠部６２が形成されているので、中間部材５０にブーツ３０の大径取付部３０ａを外嵌させた状態で、ブーツ３０の大径取付部３０ａの内周面を周方向凸部３５に接触させることができ、さらにはこの状態では、円弧状連結部６１が大径部４ａの周方向凹部３６に嵌合している。このため、ブーツ３０が装着された状態であっても、最大外径を小さく抑えることができる。 According to the constant velocity universal joint of the present invention, the intermediate member 50 has a thick-walled portion 60 fitted into the small-diameter portion 4b of the outer joint member 1, and an arc-shaped connecting portion 61 formed in the circumferential recess of the large-diameter portion 4a. Since it fits in 36, it can mount | wear to the boot mounting part (opening edge part) 31 of the mouse | mouth part 4 of the outer joint member 1 stably. Moreover, since the outer peripheral surface of the intermediate member 50 is a short cylindrical body having a cylindrical surface shape, by fitting the large-diameter mounting portion 30a of the boot 30 that is a short cylindrical portion to the intermediate member 50, The inner peripheral surface of the large-diameter mounting portion 30a and the outer peripheral surface of the intermediate member 50 can be brought into close contact with each other. In addition, the intermediate member 50 is provided with a notch 62 in which the circumferential convex portion 35 is fitted at a portion corresponding to the circumferential convex portion 35 of the large-diameter portion 4a. In the state where the large-diameter mounting portion 30a is externally fitted, the inner peripheral surface of the large-diameter mounting portion 30a of the boot 30 can be brought into contact with the circumferential convex portion 35. Further, in this state, the arc-shaped connecting portion 61 Is fitted in the circumferential recess 36 of the large diameter portion 4a. For this reason, even when the boot 30 is mounted, the maximum outer diameter can be kept small.
　このように、本発明では、最外径を最小限に抑えた上で、大径取付部３０ａが円筒形状をした熱可塑性エラストマー製ブーツ３０を等速自在継手の外側継手部材１に装着することができる。このため、外側継手部材１に対するブーツ３０の大径取付部３０ａの装着性、位置決め安定性を向上させ、かつ、安定したシール性を確保することを容易にする。そして、熱可塑性エラストマー製ブーツ３０を適用できることにより、クロロプレンラバー製ブーツに比べて耐久性が向上し、ブーツ性能の信頼性が向上する。特に、ブーツ材質として、ＪＩＳ Ｋ６２５３に規定されるタイプＤデュロメータによる硬さが３５以上５０以下である熱可塑性ポリエステル系エラストマーを使用することによって、ブーツ３０は、疲労性や摩耗性、高速回転性（回転時振れ廻り性）に優れ、ブーツ３０として安定した機能を長期にわたって発揮することができる。なお、ＪＩＳ Ｋ６２５３に規定されるタイプＤデュロメータによる硬さが３５未満の場合や、５０を超える場合は、疲労性や摩耗性にあまり優れるものではない。 Thus, in the present invention, the outermost diameter is minimized and the thermoplastic elastomer boot 30 having the cylindrical shape of the large-diameter mounting portion 30a is attached to the outer joint member 1 of the constant velocity universal joint. Can do. For this reason, it is easy to improve the mounting property and positioning stability of the large-diameter mounting portion 30a of the boot 30 with respect to the outer joint member 1, and to ensure a stable sealing property. Since the thermoplastic elastomer boot 30 can be applied, the durability is improved as compared with the chloroprene rubber boot and the reliability of the boot performance is improved. In particular, by using a thermoplastic polyester elastomer having a hardness of 35 or more and 50 or less according to JIS K6253 as a boot material, the boot 30 has fatigue, wear and high speed rotation ( It can be used for a long time with a stable function as the boot 30. In addition, when the hardness by the type D durometer prescribed in JIS K6253 is less than 35 or more than 50, the fatigue and wear properties are not so excellent.
　大径取付部３０ａの周方向膨出部４２が、周方向溝５３と周方向溝５４とで構成される周方向嵌合溝５５に嵌合することになるので、安定した装着状態を維持でき、回転時等において、装着されたブーツが外れにくく、継手内部に封入されたグリースの漏れ防止や継手内部への塵埃等の異物侵入を防止できる。 Since the circumferential bulging portion 42 of the large-diameter mounting portion 30a is fitted into the circumferential fitting groove 55 constituted by the circumferential groove 53 and the circumferential groove 54, a stable mounting state can be maintained. When rotating, the attached boot is difficult to come off, preventing leakage of grease enclosed in the joint and preventing foreign matter such as dust from entering the joint.
　外側継手部材１のマウス部開口端外周面には、テーパ面３８ａが形成されているので、外側継手部材１の旋削加工効率を向上させると同時に、ブーツ３０の大径取付部３０ａの外側継手部材１のブーツ装着部３１への装着性の向上を図ることができる。この場合、テーパ面３８ａのテーパ角θが６０°を超えると、ブーツ装着性が阻害され、テーパ角θが２５°未満では、外側継手部材１の軸方向長さが大となり、スペース効率や強度上好ましくない。 Since the taper surface 38a is formed on the outer peripheral surface of the mouth portion opening end of the outer joint member 1, the turning joint efficiency of the outer joint member 1 is improved and the outer joint member of the large-diameter mounting portion 30a of the boot 30 is improved. It is possible to improve the mountability of the first boot mounting portion 31. In this case, when the taper angle θ of the taper surface 38a exceeds 60 °, the boot mounting property is hindered. When the taper angle θ is less than 25 °, the axial length of the outer joint member 1 becomes large, and space efficiency and strength are increased. Not preferable.
　ところで、中間部材５０においては、図９と図１０に示すように、その内周面に一対の周方向内凸条６５，６６を周方向全周にわたって設けるようにしてもよい。この場合の各周方向内凸条６５，６６はその断面形状が三角形状とされている。また、厚肉部６０の内周面には、前記周方向内凸条６５，６６と相違する円弧状の周方向内凸条６７を設けるようにしてもよい。この周方向内凸条６７もその断面形状が三角形状とされる。 Incidentally, in the intermediate member 50, as shown in FIGS. 9 and 10, a pair of circumferential inner ridges 65, 66 may be provided on the inner circumferential surface over the entire circumference. In this case, each of the circumferential inner ridges 65 and 66 has a triangular cross section. Further, on the inner peripheral surface of the thick portion 60, arc-shaped circumferential inner ridges 67 different from the circumferential inner ridges 65, 66 may be provided. The circumferential inner protrusion 67 also has a triangular cross section.
　また、中間部材５０の外周面に周方向外凸条７０を周方向全周にわたって設けるようにしてもよい。また、厚肉部６０の外周面には、前記周方向外凸条７０と相違する円弧状の周方向外凸条７１を設けるようにしてもよい。周方向外凸条７０を、周方向内凸条６５，６６の間の中間部に対応する位置に設けるのが好ましい。このように設けることによって、中間部材５０は、外周側と内周側とで安定した密着性を発揮する。なお、この実施形態では、周方向外凸条７０，７１はその断面形状を三角形状としている。 Further, the outer circumferential protrusion 70 may be provided on the outer peripheral surface of the intermediate member 50 over the entire circumference. Further, an arcuate outer circumferential ridge 71 having an arc shape different from the circumferential outer ridge 70 may be provided on the outer circumferential surface of the thick portion 60. It is preferable to provide the circumferential outer ridge 70 at a position corresponding to an intermediate portion between the circumferential inner ridges 65 and 66. By providing in this way, the intermediate member 50 exhibits stable adhesion on the outer peripheral side and the inner peripheral side. In this embodiment, the outer circumferential ridges 70 and 71 have a triangular cross section.
　このように、周方向内凸条６５，６６、６７等を設けた場合、装着した際に、周方向内凸条６５，６６、６７が圧潰状となって、中間部材５０と外側継手部材１との間のシール性が向上する。また、周方向外凸条７０，７１を設けた場合、装着した際に、周方向外凸条７０，７１が圧潰状となって、中間部材５０とブーツ３０の大径取付部３０ａとの間のシール性が向上する。なお、周方向内凸条６７は、外側継手部材１の周方向凸部３５に対応する位置に設けるのが好ましく、このように設定することによって、ブーツバンド３２を締結した際の緊縛力の不均一を防止できる。 As described above, when the circumferential inner ridges 65, 66, 67 and the like are provided, the circumferential inner ridges 65, 66, 67 become crushed when they are mounted, and the intermediate member 50 and the outer joint member 1 The sealing performance between the two is improved. Further, when the circumferential outer ridges 70 and 71 are provided, the circumferential outer ridges 70 and 71 are crushed when mounted, and between the intermediate member 50 and the large-diameter mounting portion 30 a of the boot 30. Improves the sealing performance. The circumferential inner ridge 67 is preferably provided at a position corresponding to the circumferential projection 35 of the outer joint member 1. By setting in this way, the tight binding force when the boot band 32 is fastened is reduced. Uniformity can be prevented.
　各周方向内凸条６５，６６、６７及び各周方向外凸条７０、７１は、その断面形状が三角形状に限るものではなく、例えば、半円、半楕円、矩形等の種々の形状のものを採用することができる。この場合、シール性を考慮することによって、図例のように断面形状が三角形状であるのが好ましい。 The circumferential inner ridges 65, 66, 67 and the outer circumferential ridges 70, 71 are not limited to a triangular shape in cross section, and may have various shapes such as a semicircle, a semi-ellipse, and a rectangle. Things can be adopted. In this case, it is preferable that the cross-sectional shape is a triangular shape as shown in the figure by considering the sealing property.
　周方向内凸条６５，６６、６７及び各周方向外凸条７０、７１の高さ寸法Ｔ(図１１や図１２参照)としては、０．３ｍｍ以上１ｍｍ以下が好ましい。０．３ｍｍ未満ではこの凸条の効果（シール性向上効果）が得られにくく、１ｍｍを超えれば、相手面との密着性が低下したり、ブーツバンド３２を締結した際の緊縛力の不均一が発生しやくなる。 The height T (see FIGS. 11 and 12) of the circumferential inner ridges 65, 66, 67 and the circumferential outer ridges 70, 71 is preferably 0.3 mm or more and 1 mm or less. If it is less than 0.3 mm, it is difficult to obtain the effect of this ridge (seal improvement effect), and if it exceeds 1 mm, the adhesion to the mating surface is reduced or the binding force is uneven when the boot band 32 is fastened. Is more likely to occur.
　また、図１１に示すように、外側継手部材１の周方向凹部３６に対応する周方向内凸条６５，６６は、中間部材５０の円弧状連結部６１と厚肉部６０との接合部においては、凹円弧状部７５が形成されている。外側継手部材１の大径部４ａと小径部４ｂとの境界部（前記凹円弧状部に対応する境界部）がエッジ部７６とされている。 Further, as shown in FIG. 11, the circumferential inner ridges 65 and 66 corresponding to the circumferential recess 36 of the outer joint member 1 are formed at the joint portion between the arc-shaped connecting portion 61 and the thick portion 60 of the intermediate member 50. A concave arc-shaped portion 75 is formed. A boundary portion (a boundary portion corresponding to the concave arc-shaped portion) between the large diameter portion 4 a and the small diameter portion 4 b of the outer joint member 1 is an edge portion 76.
　このため、中間部材５０を外側継手部材１に装着した際には、図１２に示すように、外側継手部材１の境界部（エッジ部）７６が中間部材５０の凹円弧状部７５に食い込むことになる。これによって、シール性の向上を達成できる。中間部材５０の凹円弧状部７５の曲率半径（Ｒ寸法）としては、大きすぎると、その中央部が担ぐことで空間が生じ、シール性を低下させることになる。逆に曲率半径（Ｒ寸法）が小さすぎると、エッジ部７６の食い込み性が低下することになる。このため、この曲率半径（Ｒ寸法）はＲ０．５ｍｍ～Ｒ５ｍｍ程度が好ましい。 For this reason, when the intermediate member 50 is attached to the outer joint member 1, as shown in FIG. 12, the boundary portion (edge portion) 76 of the outer joint member 1 bites into the concave arc-shaped portion 75 of the intermediate member 50. become. Thereby, an improvement in sealing performance can be achieved. If the radius of curvature (R dimension) of the concave arcuate portion 75 of the intermediate member 50 is too large, a space is created by the central portion of the concave member 75 and the sealing performance is lowered. On the other hand, if the radius of curvature (R dimension) is too small, the biting property of the edge portion 76 is lowered. Therefore, this radius of curvature (R dimension) is preferably about R0.5 mm to R5 mm.
　以上、本発明の実施形態につき説明したが、本発明は前記実施形態に限定されることなく種々の変形が可能であって、例えば、各周方向内凸条６５，６６、６７や各周方向外凸条７０、７１を設ける場合、その断面形状が三角形状に限るものではなく、半円、半楕円、矩形等の種々の形状のものを採用することができる。しかしながら、シール性を考慮することによって、図例のように断面形状が三角形状であるのが好ましい。また、三角形状とする場合、正三角形であっても、二等辺三角形であってもよい。周方向内凸条６５，６６、６７や周方向外凸条７０、７１の数も図例のものに限らず、任意に設定できる。 As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the circumferential inner ridges 65, 66, 67 and the circumferential directions When the outer ridges 70 and 71 are provided, the cross-sectional shape is not limited to a triangular shape, and various shapes such as a semicircle, a semi-ellipse, and a rectangle can be employed. However, considering the sealing property, the cross-sectional shape is preferably a triangular shape as shown in the figure. Moreover, when setting it as a triangular shape, it may be a regular triangle or an isosceles triangle. The numbers of the circumferential inner ridges 65, 66, 67 and the circumferential outer ridges 70, 71 are not limited to those in the illustrated example, and can be arbitrarily set.
　等速自在継手としては、バーフィールド型（ＢＪ）やアンダーカットフリー型（ＵＪ）等の固定式等速自在継手であっても、トリポード型、ダブルオフセット型、クロスグルーブ型等の摺動式等速自在継手であってもよい。トリポード型等速自在継手として、シングルローラタイプであっても、ダブルローラタイプであってもよい。 As constant velocity universal joints, even fixed type constant velocity universal joints such as Barfield type (BJ) and undercut free type (UJ), sliding type such as tripod type, double offset type, cross groove type, etc. A quick universal joint may be used. The tripod type constant velocity universal joint may be a single roller type or a double roller type.
１     外側継手部材
２     トリポード部材(内側継手部材)
３     トルク伝達部材
４     マウス部
４ｂ   小径部
４ａ   大径部
１０   シャフト
１２   小内径部
１３   大内径部
３０   ブーツ
３１   ブーツ装着部
３２   ブーツバンド(締付用バンド)
３５   周方向凸部
３６   周方向凹部
４０   周方向凹溝
５３、５４    周方向溝
５５   周方向嵌合溝
６０   厚肉部
６１   円弧状連結部（薄肉連結部）
６２   切欠部
６５，６６    周方向内凸条
６７   周方向内凸条
７０，７１    周方向外凸条
７５   凹円弧状部(境界部)
７６   エッジ部
  1 Outer joint member 2 Tripod member (inner joint member)
3 Torque transmitting member 4 Mouse portion 4b Small diameter portion 4a Large diameter portion 10 Shaft 12 Small inner diameter portion 13 Large inner diameter portion 30 Boot 31 Boot mounting portion 32 Boot band (tightening band)
35 circumferential convex portion 36 circumferential concave portion 40 circumferential concave groove 53, 54 circumferential groove 55 circumferential fitting groove 60 thick portion 61 arc-shaped coupling portion (thin coupling portion)
62 Notch 65, 66 Circumferential inner ridge 67 Circumferential inner ridge 70, 71 Circumferential outer ridge 75 Concave arc-shaped part (boundary part)
76 Edge

Claims (9)

  1.   外側継手部材と、この外側継手部材に収容される内側継手部材と、外側継手部材と内側継手部材との間に介在されるトルク伝達部材とを備え、前記外側継手部材は、前記内側継手部材が収容されるマウス部を有し、このマウス部は、横断面で見ると、大径部と小径部が交互に現れる非円筒形状であり、マウス部開口部において、中間部材を介して熱可塑性ポリエステル系エラストマーからなるブーツが外嵌固定される等速自在継手であって、
    　前記外側継手部材のマウス部開口部においては、大径部では、開口端側の周方向凸部とこの周方向凸部よりも継手奥側の周方向凹部とが形成され、前記中間部材は、マウス部開口部に外嵌された際に、前記小径部に嵌合する厚肉部と、前記大径部の周方向凹部に嵌合して周方向に隣り合う厚肉部を連結する円弧状連結部とを有し、前記大径部の周方向凸部に対応する部位にはこの周方向凸部が嵌合する切欠部が形成されて、前記ブーツをこの中間部材に外嵌した状態で、前記切欠部を介してブーツの外側継手部材装着部の内周面が、前記外側継手部材の前記周方向凸部に接触することを特徴とする等速自在継手。     An outer joint member, an inner joint member accommodated in the outer joint member, and a torque transmission member interposed between the outer joint member and the inner joint member. The mouse part has a non-cylindrical shape in which a large-diameter part and a small-diameter part appear alternately when viewed in a cross section, and the thermoplastic polyester is inserted through an intermediate member at the mouth part opening part. A constant velocity universal joint to which a boot made of an elastomer is fitted and fixed,
    In the mouth portion opening of the outer joint member, in the large-diameter portion, a circumferential convex portion on the opening end side and a circumferential concave portion on the joint deeper side than the circumferential convex portion are formed, and the intermediate member is An arcuate shape that connects the thick wall portion that fits into the small diameter portion and the thick wall portion that is adjacent to the circumferential direction by fitting into the circumferential concave portion of the large diameter portion when externally fitted to the mouth portion opening. In a state where a notch portion into which the circumferential convex portion is fitted is formed at a portion corresponding to the circumferential convex portion of the large diameter portion, and the boot is externally fitted to the intermediate member. The constant velocity universal joint, wherein an inner peripheral surface of the outer joint member mounting portion of the boot is in contact with the circumferential convex portion of the outer joint member through the notch portion.
  2. 　前記中間部材をマウス部開口部に外嵌した状態において、中間部材の外周面の外径寸法が前記大径部の周方向凸部の外径寸法と同一乃至前記大径部の周方向凸部の外径寸法よりも僅かに大きいことを特徴とする請求項１に記載の等速自在継手。 In a state where the intermediate member is externally fitted to the mouth portion opening, the outer diameter of the outer peripheral surface of the intermediate member is the same as the outer diameter of the circumferential protrusion of the large diameter portion or the circumferential protrusion of the large diameter portion. The constant velocity universal joint according to claim 1, wherein the constant velocity universal joint is slightly larger than an outer diameter of the joint.
  3. 　前記中間部材をマウス部開口部に外嵌した状態において、中間部材の厚肉部の外径寸法が、中間部材の円弧状連結部の外径寸法よりも僅かに大きいことを特徴とする請求項１又は請求項２に記載の等速自在継手。 The outer diameter dimension of the thick part of the intermediate member is slightly larger than the outer diameter dimension of the arc-shaped connecting portion of the intermediate member in a state in which the intermediate member is externally fitted to the mouth portion opening. The constant velocity universal joint according to claim 1.
  4. 　中間部材の内周面に前記周方向凹溝の底面に圧接する周方向内凸条を少なくとも１つ設けたことを特徴とする請求項１～請求項３のいずれか１項に記載の等速自在継手。 The constant velocity according to any one of claims 1 to 3, wherein at least one circumferential inner ridge that presses against a bottom surface of the circumferential groove is provided on an inner circumferential surface of the intermediate member. Universal joint.
  5. 　中間部材の外周面にブーツの外側継手部材装着部の内周面に圧接する周方向外凸条を少なくとも１つ設けたことを特徴とする請求項１～請求項４のいずれか１項に記載の等速自在継手。 5. The outer circumferential surface of the intermediate member is provided with at least one circumferential outer ridge that presses against the inner circumferential surface of the outer joint member mounting portion of the boot. Constant velocity universal joint.
  6. 　前記周方向凹溝の底面に圧接する２つの周方向内凸条を中間部材の内周面に軸方向に所定間隔で設けるとともに、中間部材の外周面に１つの周方向外凸条を前記２つの周方向内凸条の中間部位に対応する部位に設けたことを特徴とする請求項１～請求項３のいずれか１項に記載の等速自在継手。 Two circumferential inner ridges that press against the bottom surface of the circumferential groove are provided on the inner circumferential surface of the intermediate member at predetermined intervals in the axial direction, and one circumferential outer ridge is disposed on the outer circumferential surface of the intermediate member. The constant velocity universal joint according to any one of claims 1 to 3, wherein the constant velocity universal joint is provided at a portion corresponding to an intermediate portion of the two inner circumferential ridges.
  7. 　中間部材の厚肉部の内周面における周方向凸部の軸方向対応部位に周方向内凸条を設けたことを特徴とする請求項１～請求項６のいずれか１項に記載の等速自在継手。 7. The inner circumferential ridge is provided at a portion corresponding to the axial direction of the circumferential convex portion on the inner circumferential surface of the thick portion of the intermediate member, or the like according to any one of claims 1 to 6, Fast universal joint.
  8. 　ブーツの外側継手部材装着部は、その外周面に締付用バンドが装着される周方向凹溝が形成されるとともに、その内周面の前記周方向凹溝の軸方向中間対応部に周方向膨出部が形成され、
    　前記外側継手部材側の周方向凸部と前記中間部材の円弧状連結部との間に第１周方向溝が形成されるとともに、中間部材の厚肉部の外周面における前記第１周方向溝の軸方向対応位置に第２周方向溝が形成され、第１周方向溝と第２周方向溝とが周方向に連続する周方向嵌合溝を構成し、この周方向嵌合溝に前記外側継手部材装着部の周方向膨出部が嵌合することを特徴とする請求項１～請求項７のいずれか１項に記載の等速自在継手。     The outer joint member mounting portion of the boot is formed with a circumferential groove in which a tightening band is mounted on the outer circumferential surface thereof, and in the circumferential direction on the axial intermediate corresponding portion of the circumferential groove on the inner circumferential surface thereof. A bulge is formed,
    A first circumferential groove is formed between the circumferential convex portion on the outer joint member side and the arc-shaped coupling portion of the intermediate member, and the first circumferential groove on the outer peripheral surface of the thick portion of the intermediate member A second circumferential groove is formed at a position corresponding to the axial direction of the first circumferential groove, and the first circumferential groove and the second circumferential groove constitute a circumferential fitting groove that is continuous in the circumferential direction. The constant velocity universal joint according to any one of claims 1 to 7, wherein a circumferential bulge portion of the outer joint member mounting portion is fitted.
  9. 　前記外側継手部材の大径部の周方向凹部と小径部とはエッジ部を介して接合され、中間部材が装着された状態で、前記エッジ部がこの中間部材における円弧状連結部と厚肉部との境界部に食い込むことを特徴とする請求項１～請求項８のいずれか１項に記載の等速自在継手。 The circumferential concave portion and the small diameter portion of the large-diameter portion of the outer joint member are joined via an edge portion, and the edge portion is connected to the arcuate connection portion and the thick-walled portion in the intermediate member with the intermediate member attached. The constant velocity universal joint according to any one of claims 1 to 8, wherein the constant velocity universal joint bites into a boundary portion between the constant velocity universal joint and the constant velocity universal joint.
PCT/JP2012/074289 2011-10-19 2012-09-21 Constant velocity universal joint WO2013058059A1 (en)

Applications Claiming Priority (2)

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JP2011-229765 2011-10-19
JP2011229765A JP2013087885A (en) 2011-10-19 2011-10-19 Constant velocity universal joint

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JP2016156469A (en) * 2015-02-25 2016-09-01 Ntn株式会社 Constant velocity universal joint
JP2017172606A (en) * 2016-03-18 2017-09-28 株式会社リケン Seal ring
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WO2016136355A1 (en) * 2015-02-25 2016-09-01 Ntn株式会社 Constant velocity universal joint
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US10550894B2 (en) 2015-02-25 2020-02-04 Ntn Corporation Constant velocity universal joint
JP2017172606A (en) * 2016-03-18 2017-09-28 株式会社リケン Seal ring
CN114619601A (en) * 2021-12-30 2022-06-14 浙江国泰萧星密封材料股份有限公司 Preparation method of oil pocket for sealed large-size coupler

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