JP2009185987A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing device having a rolling body prevented from rattling, hardly allowing components to deform or break and having a high rated load. <P>SOLUTION: The rolling body 3 is formed by press-fitting a pin 31 into a through-hole 40 of a roller 30 having the through-hole 40 penetrating in the axial direction, a peripheral cylindrical surface 41 as a raceway surface, a first end surface 42 and a second end surface 43. Furthermore, a first ball bearing 8 is arranged between a through-hole 60 axially penetrating an axially directional end surface of a first annular member 6 and a peripheral surface of a first rod-like section 50 or a member projecting from one side aperture of the through-hole 40 in the pin 30. Additionally, a second ball bearing 9 is arranged between a through-hole 61 axially penetrating an axially directional end surface of a second annular member 6 and a peripheral surface of a second rod-like section 51 or a member projecting from the other side aperture of the through-hole 40 in the pin 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rolling bearing device including an outer ring, an inner ring, and rolling elements.

  Conventionally, as a rolling bearing device, there is a cylindrical roller bearing described in Japanese Patent Laid-Open No. 2003-343574 (Patent Document 1).

  The cylindrical roller bearing includes an outer ring, an inner ring, and a cage assembly, and the cage assembly includes a plurality of cylindrical rollers and a pin type cage.

  Each of the cylindrical rollers has a through hole extending along the axial center of the cylindrical roller.

  The pin-type retainer includes a first ring, a second ring, and a plurality of pins that connect the first ring and the second ring, and the plurality of pins are spaced apart from each other in the circumferential direction of the first ring. Arranged.

  In the cage assembly, after the pin is inserted into the through hole of the cylindrical roller, one end of the pin is fixed to the first ring, while the other end of the pin is formed in the second ring. It is formed by being inserted and fixed in the through hole.

  The plurality of cylindrical rollers are arranged at intervals in the circumferential direction between the cylindrical raceway surface of the outer ring and the cylindrical raceway surface of the inner ring while being held by the pin type cage.

  In the conventional cylindrical roller bearing described above, the inner diameter of the through hole of the cylindrical roller is made several millimeters larger than the outer diameter of the pin, and a radial clearance is provided between the through hole of the cylindrical roller and the pin. , So that it can rotate freely.

  In the conventional cylindrical roller bearing, it is difficult to prevent the cylindrical rollers from rattling due to the circumferential gap of about several mm due to the presence or absence of each cylindrical roller causing a circumferential advance around the center of the pin.

  Further, in the conventional cylindrical roller bearing, it is difficult to avoid the impact force due to the radial gap from being applied to the pin, and it is difficult to avoid deformation or breakage of the pin.

Further, it is desired to increase the rated load in a large-sized rolling bearing such as the conventional cylindrical roller bearing having a pin type cage.
JP 2003-343574 A

  Accordingly, an object of the present invention is to provide a rolling bearing device in which rolling elements do not rattle, deformation or breakage of component parts hardly occurs, and a rated load is large.

In order to solve the above problems, the rolling bearing device of the present invention is
An outer ring having a raceway surface on the inner periphery;
An inner ring having a raceway surface on the outer periphery;
An annular rolling surface that rolls on the raceway surface of the outer ring and the raceway surface of the inner ring, and a first end surface and a second end surface that are located on one end side and the other end side in the axial direction of the rolling surface. A first rod-like portion protruding substantially outward in the axial direction from the first end surface, and a second rod-like portion protruding substantially outward in the axial direction from the second end surface. Rolling elements,
A first annular member having a through hole through which the first rod-shaped portion is inserted, and being arranged so that an axial center substantially coincides with an axial center of the outer ring;
A second annular member having a through-hole through which the second rod-shaped portion is inserted and arranged so that the axial center substantially coincides with the axial center of the outer ring;
A first rolling bearing disposed between an inner peripheral surface of the through hole of the first annular member and an outer peripheral surface of the first rod-shaped portion;
A second rolling bearing disposed between the inner peripheral surface of the through hole of the second annular member and the outer peripheral surface of the second rod-shaped portion is provided.

  According to this invention, the 1st rolling bearing arrange | positioned between the internal peripheral surface of the said through-hole of the said 1st annular member, and the outer peripheral surface of the said 1st rod-shaped part, The said penetration of the said 2nd annular member The rolling element is configured to be rotatable with respect to the first and second annular members by a second rolling bearing disposed between the inner peripheral surface of the hole and the outer peripheral surface of the second rod-shaped portion. Therefore, the first and second rolling bearings represent the maximum radial relative movable distance of the rolling element with respect to the annular member (equivalent to the ring of the pin type cage in the conventional structure) that has been about several millimeters conventionally. The radial gap can be rapidly reduced to a few μm.

  Therefore, rattling of the rolling element due to the relative movement of the rolling element in the radial direction with respect to the annular member does not occur, and the impact force applied to the components based on the relative movement can be significantly reduced.

  Further, since the relative movement can be remarkably reduced, the size of the rolling element can be made larger than before under the restriction that the two rolling elements adjacent in the circumferential direction do not contact each other. The number of rolling elements can be increased. Therefore, the rated load of the rolling bearing device of the present invention can be increased.

In one embodiment,
The rolling element is
A roller having the rolling surface and a through hole extending substantially along the axial center of the rolling surface;
A pin inserted through the through hole of the roller,
The first rod-shaped portion is one end portion of the pin protruding from one opening of the through hole of the roller,
The second rod-shaped portion is the other end portion of the pin protruding from the other opening of the through hole of the roller.

  According to the above-described embodiment, the annular rolling surface, the first and second end surfaces located on both sides in the axial direction, the first rod-like portion protruding outward in the substantially axial direction from the first end surface, and the second A rolling element having the second rod-like portion positioned substantially outward in the axial direction from the end face can be manufactured easily and inexpensively, and the manufacturing cost of the rolling bearing device can be reduced.

  According to the rolling bearing device of the present invention, the maximum relative movable distance in the radial direction of the rolling element with respect to the annular member (equivalent to the ring of the pin type cage in the conventional structure), which has been about several millimeters in the past, The radial clearances of the first and second rolling bearings can be rapidly reduced to a few μm. Therefore, rattling of the rolling element due to the relative movement of the rolling element in the radial direction with respect to the annular member does not occur.

  Further, according to the rolling bearing device of the present invention, the impact force applied to the component parts due to the relative movement can be remarkably reduced.

  Further, according to the rolling bearing device of the present invention, since the relative movement can be remarkably reduced, under the restriction that the two rolling elements adjacent in the circumferential direction do not come into contact with each other. However, the size of the rolling elements can be increased, or the number of rolling elements can be increased. Therefore, the rated load of the rolling bearing device of the present invention can be increased.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction of a rolling bearing device according to an embodiment of the present invention.

  The rolling bearing device includes an outer ring 1, an inner ring 2, a plurality of rolling elements 3, a first annular member 6, a second annular member 7, a first ball bearing 8 as a first rolling bearing, and a second rolling bearing. A second ball bearing 9 is provided.

  The outer ring 1 has a main body portion 10 and a flange portion 11. The main body 10 has an inner circumferential cylindrical raceway surface 20. The main body 10 has a substantially L-shaped cross section in the axial section, and has a structure having a flange on only one side in the axial direction. The flange portion 11 is located on the other side in the axial direction of the inner circumferential cylindrical raceway surface 20 of the main body portion 10. The flange part 11 is pressed toward the main body part 10 by a member (not shown) located on the opposite side of the main body side 10 of the flange part 11 in the axial direction. On the other hand, the inner ring 2 has an outer peripheral cylindrical raceway surface 21. The outer peripheral cylindrical raceway surface 21 faces the inner peripheral cylindrical raceway surface 20 of the outer ring 1 in the radial direction of the outer ring 1.

  Each of the rolling elements 3 has a roller 30 and a pin 31.

  The roller 30 has a through hole 40, an outer peripheral cylindrical surface 41, and first and second end surfaces 42 and 43 in the axial direction. The through hole 40 has a substantially cylindrical shape and extends along the axial center of the substantially outer peripheral cylindrical surface 41. The first end surface 42 is located on one side of the outer peripheral cylindrical surface 41 in the axial direction, while the second end surface 43 is located on the other side of the outer peripheral cylindrical surface 41 in the axial direction.

  The pin 31 is tightly fitted into the through hole 40 by press fitting. The axial length of the pin 31 is longer than the axial length of the through hole 40 of the roller 30.

  In the pin 31, the portion protruding from one opening of the through hole 40 constitutes the first rod-shaped portion 50, while the portion of the pin 31 protruding from the other opening of the through hole 40 is the first Two rod-like parts 51 are constituted.

  Further, in each of the rolling elements 3, portions other than the first and second rod-shaped portions 50 and 51, that is, portions that do not protrude from the openings on both sides of the through hole 40 in the entire roller 30 and the pin 31, are main body portions. 45 is configured.

  The vertical bisector including the radial direction of the main body 45 substantially coincides with the vertical bisector including the radial direction of the rolling element 3. A cylindrical outer peripheral surface 41 (corresponding to the outer peripheral cylindrical surface of the roller 30) 41 of the main body 45 of the rolling element 3 rolls on the inner peripheral cylindrical raceway surface 20 of the outer ring 1 and on the outer peripheral cylindrical raceway surface 21 of the inner ring 2. It is a rolling surface.

  The first annular member 6 is located on one side of the roller 30 in the axial direction. The first annular member 6 has a plurality of through holes 60 between the inner peripheral surface and the outer peripheral surface in the radial direction. The plurality of through holes 60 are arranged at regular intervals in the circumferential direction of the first annular member 6. Each through hole 60 extends substantially in the axial direction of the first annular member 6.

  The inner diameter of each through hole 60 of the first annular member 6 has two types of inner diameters. As shown in FIG. 1, the first annular member 6 has a substantially L-shaped cross section in the half sectional view in the axial direction. In each of the through holes 60, the inner diameter of one opening on the roller 30 side is larger than the other inner diameter.

  Assuming that the axial dimension of the first annular member 6 is a, in the through hole 60 of the first annular member 6, the distance from the axial end surface on the roller 30 side of the first annular member 6 to a distance b (<a). In the first part of the range, the inner diameter of the through hole 60 is the first dimension.

  Further, in the through hole 60 of the first annular member 6, in the second portion in the range from the distance (a−b) to the distance a from the axial end surface of the first annular member 6 on the roller 30 side, The inner diameter of the through hole 60 is a second dimension that is smaller than the first dimension.

  The second annular member 7 is located on the other side of the roller 30 in the axial direction. The second annular member 7 has a plurality of through holes 61 between the inner peripheral surface and the outer peripheral surface in the radial direction. The plurality of through holes 61 are arranged at regular intervals in the circumferential direction of the second annular member 7. Each through hole 61 extends substantially in the axial direction of the second annular member 7.

  The inner diameter of each through hole 61 of the second annular member 7 has two types of inner diameters. Specifically, as shown in FIG. 1, in the half sectional view in the axial direction, the second annular member 7 has a substantially L-shaped cross section. In each of the through holes 61, the inner diameter of one opening on the roller 30 side is larger than the other inner diameter.

  Assuming that the axial dimension of the second annular member 7 is c, in the through hole 61 of the second annular member 7, the distance from the axial end surface on the roller 30 side of the second annular member 7 to a distance d (<c). In the first part of the range, the inner diameter of the through hole 61 is the third dimension.

  Further, in the through hole 61 of the second annular member 7, in the second portion in the range of the distance from the distance (cd) to c from the axial end surface on the roller 30 side of the second annular member 7, The inner diameter of the through hole 61 is a fourth dimension that is smaller than the third dimension.

  The first ball bearing 8 has substantially the dimension b in the axial direction. The first ball bearing 8 is disposed between the first portion of the through hole 60 of the first annular member 6 and the first rod-shaped portion 50. The outer peripheral surface of the outer ring of the first ball bearing 8 is fitted and fixed to the first portion of the through hole 60 of the first annular member 6 by an interference fit. Further, the inner peripheral surface of the inner ring of the first ball bearing 8 is fixed by being fitted onto the outer peripheral surface of the first rod-like portion 50 by an interference fit. The first ball bearing 8 supports the first rod-like portion 50 so as to be rotatable with respect to the first annular member 6.

  An end surface on one side in the axial direction of the first ball bearing 8 is an axial surface that is a step portion located between the first portion and the second portion on the inner surface of the through hole 60 of the first annular member 6. It is in contact with the end face. In this way, the first ball bearing 8 is positioned with respect to the first annular member 6.

  The second ball bearing 9 has an axial dimension of approximately c. The second ball bearing 9 is disposed between the first portion of the through hole 61 of the second annular member 7 and the second rod-shaped portion 51. The outer peripheral surface of the outer ring of the second ball bearing 9 is fitted and fixed to the first portion of the through hole 61 of the second annular member 7 by an interference fit. Further, the inner peripheral surface of the inner ring of the second ball bearing 9 is fixed by being fitted onto the outer peripheral surface of the second rod-shaped portion 51 by an interference fit. The second ball bearing 9 supports the second rod-shaped portion 51 so as to be rotatable with respect to the second annular member 7.

  An end surface on one side in the axial direction of the second ball bearing 9 is an axial surface that is a step portion located between the first portion and the second portion on the inner surface of the through hole 61 of the second annular member 7. It is in contact with the end face. In this way, the first ball bearing 9 is positioned with respect to the second annular member 7.

  The inner diameter of the second portion of the first annular member 6 is larger than the outer diameter of the first rod-like portion 50. The second portion of the first annular member 6 is located at a radial interval with respect to the first rod-like portion 50. The inner diameter of the second portion of the second annular member 7 is larger than the outer diameter of the second rod-shaped portion 51. The second portion of the second annular member 7 is located at a radial interval with respect to the first rod-like portion 50. In this way, each rolling element 3 can freely rotate with respect to the first and second annular members 6 and 7.

  According to the rolling bearing device of the above embodiment, the first portion disposed between the first portion (a part of the inner peripheral surface) of the through hole 60 of the first annular member 6 and the outer peripheral surface of the first rod-shaped portion 50. A first ball bearing 8, a second ball bearing 9 disposed between the first portion (a part of the inner peripheral surface) of the through hole 61 of the second annular member 7 and the outer peripheral surface of the second rod-shaped portion 51; Therefore, since the rolling element 3 is configured to be rotatable with respect to the first and second annular members 6 and 7, the annular members 6 and 7 that have conventionally been several millimeters (in the conventional structure, the pin type is held) The maximum relative movable distance in the radial direction of the rolling element 3 with respect to the ring of the vessel can be rapidly reduced to the radial gap between the first and second ball bearings 8 and 9, that is, about several μm.

  Therefore, the rolling element does not rattle due to the relative movement in the radial direction of the rolling element 2 with respect to the first and second annular members 6 and 7, and the impact applied to the components based on the relative movement. The power can be greatly reduced.

  Further, according to the rolling bearing device of the above embodiment, the relative movement can be remarkably reduced, so that the two rolling elements 3, 3 adjacent in the circumferential direction are not in contact with each other. Thus, the dimensions of the rolling elements 3 can be increased or the number of the rolling elements 3 can be increased as compared with the prior art. Therefore, the rated load of the rolling bearing device can be increased.

  Further, according to the rolling bearing device of the above-described embodiment, the rolling element 3 having a complicated shape, that is, the annular rolling surface (corresponding to the outer peripheral cylindrical surface 41), and the first and the first positioned on both sides in the axial direction. 2 end surfaces 42, 43, a first rod-like portion 50 projecting substantially axially outward from the first end surface 42, and a second rod-like portion 51 located substantially axially outward from the second end surface 43. Since the rolling element 3 is manufactured by press-fitting the pin 31 into the through hole 40 of the roller 30, the rolling element 3 having the complicated shape can be manufactured easily and inexpensively. Therefore, the manufacturing cost of the rolling bearing device can be reduced.

  In the rolling bearing device of the above-described embodiment, the rolling element 3 is inserted into the through hole 40 of the roller 30 having the through hole 40, the rolling surface 41, the first end surface 42, and the second end surface 43 penetrating in the axial direction. 31 is formed by press-fitting and the pin 31 is tightly fitted in the through hole 40 of the roller 30, but in this invention, the pin may be intermediately fitted in the through hole of the cylindrical roller, The pin may be fitted with a gap in a state where the radial gap with respect to the through hole of the cylindrical roller is smaller than the conventional one. Here, from the viewpoint of increasing the rated load, it is needless to say that an interference fit is most preferable and an intermediate fit is then preferred.

  In the rolling bearing device of the above embodiment, the rolling element 3 is inserted into the through hole 40 of the roller 30 having the through hole 40, the rolling surface 41, the first end surface 42, and the second end surface 43 penetrating in the axial direction. A pin 31, which is a member different from 30, is inserted by press fitting.

  However, in the present invention, as the rolling element, an integral rolling element, specifically, an annular rolling surface that rolls on the raceway surface of the outer ring and the raceway surface of the inner ring, one end side in the axial direction of the rolling surface, and A main body portion having a first end surface and a second end surface in the axial direction located on the other end side, a first rod-like portion protruding outward in the substantially axial direction from the first end surface, and a substantially axial direction from the second end surface An integrated rolling element having a second rod-like portion positioned outward may be used.

  Further, in the rolling bearing device of the above embodiment, the rolling element 3 has the pin 31 inserted through the roller 30 having the through hole 40 along the axis center. A pin may be inserted into a tapered roller having a through hole along the center, and the rolling element may be inserted into a spherical roller (convex roller) having a through hole along the axial center. It may be.

  Further, in the rolling bearing device of the above embodiment, the first rod-shaped portion 51 and the second rod-shaped portion 52 are substantially the same, but in the present invention, the first rod-shaped portion and the second rod-shaped portion are: The structure (shape or size) may be different. In the present invention, the first annular member 6 and the second annular member 7 may be the same, and the first annular member 6 and the second annular member 7 are different in structure (shape or size). May be.

  In the rolling bearing device of the above embodiment, the first ball bearing 8 is adopted as the first rolling bearing, and the second ball bearing 9 is adopted as the second rolling bearing.

  Here, the first ball bearing 8 and the second ball bearing 9 may be the same, and at least one of the size and structure of the first ball bearing 8 and the second ball bearing 9 is different. Also good.

  Each of the ball bearings 8 and 9 is a ball bearing having a so-called crown-shaped cage, even if it has a cage in which two annular members are connected by a plurality of pillars. Alternatively, it may be a so-called ball bearing without a cage. Each of the ball bearings 8 and 9 may be a ball bearing having a deep groove type raceway groove or a ball bearing having an angular type raceway groove.

  In the rolling bearing device of the above embodiment, both the first and second rolling bearings are ball bearings 8 and 9, but in this invention, at least one of the first and second rolling bearings is a needle. It may be a rolling bearing other than a ball bearing, such as a bearing or a roller bearing. When a ball bearing is used as at least one of the first and second rolling bearings, the ball bearings are mass-produced and inexpensive, so that the manufacturing cost of the rolling bearing device of the present invention can be reduced.

  In the rolling bearing device of the above embodiment, the rolling elements 3 having the rod-like portions 50 and 51 are arranged in a single row in the axial direction. However, in this invention, the rolling elements having the rod-like portions are arranged in the axial direction. It may be arranged in a double row.

It is a schematic cross section of the axial direction of the rolling bearing apparatus of one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Rolling element 6 1st annular member 7 2nd annular member 8 1st ball bearing 9 2nd ball bearing 20 Inner circumference cylindrical raceway surface 21 Outer circumference cylindrical raceway surface 30 Roller 31 Pin 40 Roller through hole 41 Outer circumference cylinder Surface 42 First end surface 43 Second end surface 45 Rolling body main body 50 First rod-shaped portion 51 Second rod-shaped portion 60 Through hole in first annular member 61 Through hole in second annular member

Claims (2)

An outer ring having a raceway surface on the inner periphery;
An inner ring having a raceway surface on the outer periphery;
An annular rolling surface that rolls on the raceway surface of the outer ring and the raceway surface of the inner ring, and a first end surface and a second end surface that are located on one end side and the other end side in the axial direction of the rolling surface. A first rod-like portion protruding substantially outward in the axial direction from the first end surface, and a second rod-like portion protruding substantially outward in the axial direction from the second end surface. Rolling elements,
A first annular member having a through hole through which the first rod-shaped portion is inserted, and being arranged so that an axial center substantially coincides with an axial center of the outer ring;
A second annular member having a through-hole through which the second rod-shaped portion is inserted and arranged so that the axial center substantially coincides with the axial center of the outer ring;
A first rolling bearing disposed between an inner peripheral surface of the through hole of the first annular member and an outer peripheral surface of the first rod-shaped portion;
A rolling bearing device comprising: a second rolling bearing disposed between an inner peripheral surface of the through hole of the second annular member and an outer peripheral surface of the second rod-shaped portion. The rolling bearing device according to claim 1,
The rolling element is
A roller having the rolling surface and a through hole extending substantially along the axial center of the rolling surface;
A pin inserted through the through hole of the roller,
The first rod-shaped portion is one end portion of the pin protruding from one opening of the through hole of the roller,
2. The rolling bearing device according to claim 1, wherein the second rod-shaped portion is the other end portion of the pin protruding from the other opening of the through hole of the roller.

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