JP2016107873A - Wheel bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the loosening of a bolt member for a long period of time without the necessity of a different component.SOLUTION: A wheel bearing device comprises: an outer ring 5 in which double-row outside raceway surfaces 13, 14 are formed at an internal peripheral face; a hub ring 1 and an inner ring 2 having double-row raceway surfaces 7, 8, respectively, which oppose the outside raceway surfaces 13, 14 at external peripheral faces; and a wheel bearing 20 which is composed of the outside raceway surfaces 13, 14 of the outer ring 5, and double-row rolling bodies 3, 4 which are interposed between the inside raceway surfaces 7, 8 of the hub ring 1 and the inner ring 2. The hub ring 1 of the wheel bearing 20 and an outside joint member 24 of a constant velocity universal joint 6 are fastened to each other via a bolt member 32. A flange part 41 of a head 51 of the bolt member 32 is seated on a seat face 36 of a recess 35 of the hub ring 1, a peripheral wall part 49 of the recess 35 is caulked to a notch 42 which is formed at an external peripheral part of the flange part 41, and a caulking part 50 of the peripheral wall part 49 is thereby engaged with the notch 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wheel bearing device that rotatably supports driving wheels (front wheels of FF vehicles, rear wheels of FR vehicles, all wheels of 4WD vehicles), for example, with respect to a suspension device of an automobile.

  For example, the present applicant has previously proposed a wheel bearing device in which a main part is composed of a wheel bearing composed of a hub ring, an inner ring, a double row rolling element and an outer ring, and a fixed constant velocity universal joint. (For example, refer to Patent Document 1). This type of wheel bearing device has a structure in which a hub wheel of a wheel bearing and an outer joint member of a constant velocity universal joint are fastened by a bolt member.

  Thus, the wheel bearing device has a structure in which the hub wheel of the wheel bearing and the outer joint member of the constant velocity universal joint are fastened by the bolt member, so that the wheel can be assembled or disassembled and has excellent maintainability. A bearing device is provided.

  However, if the bolt member is loosened after the wheel bearing device is assembled in the vehicle, there is a risk that a rattling may occur and abnormal noise may be generated or wear may be promoted.

  In order to prevent such a problem, the wheel bearing device disclosed in Patent Document 1 is provided with a locking member that restricts the rotation of the bolt member in the loosening direction, between the head of the bolt member and the hub wheel. It has a structure provided between them. As the locking member, a cap member, a clip member or a pin-shaped member is employed.

  In the loosening prevention structure with the cap member, the cap body of the cap member is attached to the head of the bolt member in a state where circumferential rotation is restricted, and the hub ring is ruggedly engaged by tightening the flange extending from the cap body. Yes. Thus, by restraining the cap member in the circumferential direction, rotation of the bolt member in the loosening direction is restricted.

  Further, in the structure for preventing looseness by the clip member, the clip body of the clip member is mounted on the head of the bolt member in a state in which circumferential rotation is restricted, and the protrusion or recess extending from the clip body is the recess or protrusion of the hub wheel. Is engaged with the concave and convex. In this way, the rotation of the bolt member in the loosening direction is restricted by restraining the clip member in the circumferential direction.

  Furthermore, in the structure for preventing loosening by the pin-shaped member, the tip of the pin-shaped member is inserted into the insertion hole of the hub ring, and the portion exposed from the insertion hole of the pin-shaped member is swaged and deformed to deform the head of the bolt member. It is in close contact. In this way, the pin-shaped member is closely engaged with the head of the bolt member, thereby restricting the rotation of the bolt member in the loosening direction.

JP 2014-205478 A

  In the conventional wheel bearing device disclosed in Patent Document 1, a locking member exemplified by a cap member, a clip member, or a pin-like member is provided between the head of the bolt member and the hub wheel, thereby providing a hub. The rotation of the bolt member in the loosening direction with respect to the ring can be restricted. Thereby, the fastening state of the hub wheel of the wheel bearing and the outer joint member of the constant velocity universal joint can be maintained for a long time. As a result, it is possible to suppress problems such as generation of abnormal noise and acceleration of wear due to loosening of the bolt member.

  However, when a cap member, a clip member, or a pin-like member is used as a locking member that restricts the rotation of the bolt member in the loosening direction, the cap member and the clip member described above are separate from the components that constitute the wheel bearing device. Or the component which consists of a pin-shaped member is needed. Therefore, the number of parts increases and the cost of the wheel bearing device increases. Moreover, the operation | work which assembles these cap members, a clip member, or a pin-shaped member is also required, and the assembly man-hour of the wheel bearing apparatus will also increase.

  Therefore, the present invention has been proposed in view of the above-described improvements, and the object of the present invention is for an inexpensive wheel that can prevent loosening of a bolt member over a long period of time without requiring a separate part. It is to provide a bearing device.

  A wheel bearing device according to the present invention includes an outer member having a double row outer raceway surface formed on an inner peripheral surface, and a double row inner raceway surface facing the outer raceway surface on an outer peripheral surface, and a hub wheel. And an inner member made of an inner ring, and a double-row rolling element interposed between the outer raceway surface of the outer member and the inner raceway surface of the inner member, A structure in which a hub wheel and an outer joint member of a constant velocity universal joint are fastened through a bolt member is provided. As described above, the wheel bearing device includes the wheel bearing and the constant velocity universal joint.

  As a technical means for achieving the above-mentioned object, a wheel bearing device according to the present invention has a flange portion of a head portion of a bolt member seated on a seat surface of a concave portion of a hub wheel, and an outer peripheral portion of the flange portion. The peripheral wall portion of the concave portion is caulked to the notch portion formed in the upper portion, and the caulking portion of the peripheral wall portion is engaged with the notch portion.

  In the present invention, the caulking portion formed by caulking the peripheral wall portion of the concave portion of the hub wheel is engaged with the notch portion of the flange portion of the bolt member seated on the seat surface of the concave portion of the hub wheel. The rotation of the bolt member in the loosening direction can be restricted between the bolt member and the hub wheel in the engaged state of the caulking portion of the peripheral wall portion of the hub wheel with the notch portion of the flange portion of the bolt member. . As a result, the fastening state between the wheel bearing and the constant velocity universal joint can be maintained for a long time.

  In the present invention described above, it is desirable to have a structure in which the notches of the flange portion of the bolt member are provided at a plurality of locations on the outer peripheral portion of the flange portion. Thus, if the engagement part of a notch part and a caulking part is made into multiple places, the site | part which controls rotation of the bolt member in the loosening direction will be in multiple places. As a result, the rotation of the bolt member in the loosening direction can be reliably restricted.

  In the above-described present invention, it is desirable that the peripheral wall portion of the concave portion of the hub wheel is not heat-treated and the surface hardness is HRC35 or less. Thus, if the numerical range of the surface hardness of a surrounding wall part is prescribed | regulated, the caulking of a surrounding wall part will become easy and workability | operativity can be improved when restrict | limiting rotation of the bolt member in the loosening direction.

  According to the present invention, the caulking portion formed by caulking the peripheral wall portion of the concave portion of the hub wheel is engaged with the notch portion of the flange portion of the bolt member seated on the seat surface of the concave portion of the hub wheel. By doing so, it is possible to prevent loosening of the bolt member over a long period of time without requiring separate parts such as a conventional cap member, clip member, or pin-like member. As a result, the number of parts can be reduced and the cost of the wheel bearing device can be reduced. In addition, since the work of assembling a cap member, clip member, or pin-like member as in the prior art becomes unnecessary, the number of assembly steps of the wheel bearing device can be reduced.

In embodiment of the wheel bearing apparatus which concerns on this invention, it is sectional drawing which shows the state after attaching a constant velocity universal joint to the wheel bearing. It is sectional drawing which shows the state before attaching a constant velocity universal joint to the wheel bearing of FIG. It is the structural example which formed the recessed part which has a fastening allowance only with respect to the circumferential direction side wall part of a convex part, (A) is the principal part which shows the state before pressing the stem part of an outer joint member in the hub ring of a wheel bearing. An expanded sectional view and (B) are sectional views which follow an AA line of (A). It is the structural example which formed the recessed part which has a fastening allowance only with respect to the circumferential direction side wall part of a convex part, (A) is the principal part which shows the state in the middle of press-fitting the stem part of an outer joint member to the hub ring of a wheel bearing An expanded sectional view and (B) are sectional views which follow a BB line of (A). It is the structural example which formed the recessed part which has a fastening allowance only with respect to the circumferential direction side wall part of a convex part, (A) is the principal part which shows the state after press-fitting the stem part of an outer joint member in the hub ring of a wheel bearing An expanded sectional view and (B) are sectional views which follow a CC line of (A). It is the front view which looked at the bolt member and hub wheel shown in FIG. 1 from the arrow Y direction. (A) is a principal part enlarged front view which shows the state before crimping the peripheral wall part of the recessed part of the hub ring of FIG. 6, (B) is sectional drawing which follows the DD line | wire of (A). (A) is a principal part enlarged front view which shows the state after crimping the peripheral wall part of the recessed part of the hub ring of FIG. 6, (B) is sectional drawing which follows the EE line of (A). It is a structural example in which a concave portion having a tightening margin is formed with respect to the circumferential side wall portion and the radial front end portion of the convex portion, and (A) is a state in which the stem portion of the outer joint member is pressed into the hub wheel of the wheel bearing The principal part expanded sectional view which shows this, (B) is sectional drawing which follows the FF line | wire of (A). In the structure example in which a concave portion having a tightening margin is formed with respect to the circumferential side wall portion and the radial front end portion of the convex portion, (A) is a state after the stem portion of the outer joint member is press-fitted into the hub wheel of the wheel bearing The principal part expanded sectional view which shows this, (B) is sectional drawing which follows the GG line of (A).

  An embodiment of a wheel bearing device according to the present invention will be described in detail below. FIG. 1 shows a state after the constant velocity universal joint 6 is assembled to the wheel bearing 20, and FIG. 2 shows a state before the constant velocity universal joint 6 is assembled to the wheel bearing 20. In the following description, the side closer to the outside of the vehicle body is referred to as the outboard side (left side of the drawing) while the wheel bearing device is assembled to the vehicle body, and the side closer to the center is referred to as the inboard side (right side of the drawing). Called.

  The wheel bearing device shown in FIG. 1 and FIG. 2 has a constant speed with a wheel bearing 20 including a hub wheel 1 and an inner ring 2 which are inner members, double row rolling elements 3 and 4 and an outer ring 5 which is an outer member. The main part is composed of the universal joint 6. The overall configuration of the wheel bearing device will be described before describing the characteristic configuration of this embodiment.

  The hub wheel 1 constituting the wheel bearing 20 has an inner raceway surface 7 on the outboard side formed on the outer peripheral surface thereof, and includes a wheel mounting flange 9 for mounting a wheel (not shown). Hub bolts 10 for fixing the wheel disc are implanted at equal intervals in the circumferential direction of the wheel mounting flange 9. The inner ring 2 is fitted to the small-diameter step portion 12 formed on the inboard side outer peripheral surface of the hub wheel 1, and the inboard-side inner raceway surface 8 is formed on the outer peripheral surface of the inner ring 2.

  The inner ring 2 constituting the wheel bearing 20 is press-fitted with an appropriate tightening allowance to prevent creep. The outboard side inner raceway surface 7 formed on the outer peripheral surface of the hub wheel 1 and the inboard side inner raceway surface 8 formed on the outer peripheral surface of the inner ring 2 constitute a double row raceway surface. The inner ring 2 is press-fitted into the small-diameter step portion 12 of the hub wheel 1, and the inboard side end portion of the small-diameter step portion 12 is crimped outward by swing caulking, and the inner ring 2 is prevented from coming off with the caulking portion 11. Thus, it is integrated with the hub wheel 1 and preload is applied to the wheel bearing 20.

  The outer ring 5 constituting the wheel bearing 20 is formed with double-row outer raceways 13 and 14 facing the inner raceways 7 and 8 of the hub wheel 1 and the inner race 2 on the inner circumferential surface, and a vehicle body (not shown). A vehicle body mounting flange 19 for mounting on a knuckle extending from the suspension device is provided.

  The wheel bearing 20 including the hub wheel 1, the inner ring 2 and the outer ring 5 described above has a double-row angular ball bearing structure, and the inner raceway surfaces 7 and 8 formed on the outer peripheral surfaces of the hub wheel 1 and the inner ring 2 and the outer ring. 5, rolling elements 3, 4 are interposed between outer raceway surfaces 13, 14 formed on the inner peripheral surface of 5, and rolling elements 3, 4 in each row are supported at equal intervals in the circumferential direction by cages 15, 16. Has the structure.

  A pair of seals 17 and 18 that seal the annular space between the outer ring 5, the hub ring 1, and the inner ring 2 are provided at both ends of the wheel bearing 20 so as to be in sliding contact with the outer peripheral surfaces of the hub ring 1 and the inner ring 2. 5 is fitted to the inner diameters of both end portions to prevent leakage of grease filled inside and entry of water and foreign matters from the outside.

  The constant velocity universal joint 6 is a fixed type constant velocity universal joint that constitutes a part of the drive shaft 21, and is provided at one end of the intermediate shaft 22. The constant velocity universal joint 6 includes an outer joint member 24 in which a track groove 23 is formed on the inner peripheral surface, and an inner joint member in which a track groove 25 facing the track groove 23 of the outer joint member 24 is formed on the outer peripheral surface. 26, between the track groove 23 of the outer joint member 24 and the track groove 25 of the inner joint member 26, and between the inner peripheral surface of the outer joint member 24 and the outer peripheral surface of the inner joint member 26. And a cage 28 for holding the ball 27.

  The outer joint member 24 includes a mouth portion 29 that accommodates an inner part composed of the inner joint member 26, a ball 27, and a cage 28, and a stem portion 30 that extends integrally from the mouth portion 29 in the axial direction. The inner joint member 26 is coupled to the intermediate shaft 22 so that torque can be transmitted by press-fitting the shaft end of the intermediate shaft 22 and by spline fitting.

  A resin bellows-like boot 31 is mounted between the outer joint member 24 of the constant velocity universal joint 6 and the intermediate shaft 22, and the opening of the outer joint member 24 is closed by the boot 31. The boot 31 prevents leakage of lubricant such as grease sealed inside the joint and prevents foreign matter from entering from the outside of the joint.

  The wheel bearing device includes a coupling structure between the wheel bearing 20 and the constant velocity universal joint 6 as described below. That is, a male spline including a plurality of convex portions 37 extending in the axial direction is formed on the outer peripheral surface of the stem portion 30 of the outer joint member 24. On the other hand, a plurality of concave portions 39 having a tightening margin with respect to the above-described convex portions 37 are formed on the inner peripheral surface of the shaft hole 38 of the hub wheel 1 (see FIG. 2). The stem portion 30 of the outer joint member 24 is press-fitted into the shaft hole 38 of the hub wheel 1, and the concave portion 40 is formed by transferring the shape of the convex portion 37 to the shaft hole 38, and the convex portion 37 and the concave portion 40 are fitted to each other. The concave-convex fitting structure M in which the joint contact region X is in close contact is configured (see FIG. 1).

  The wheel bearing device includes a tightening structure N (see FIG. 1) using bolt members 32 as described below. That is, a state in which the bolt member 32 is locked to the hub wheel 1 by screwing the male screw portion 34 of the bolt member 32 to the female screw portion 33 formed at the shaft end of the stem portion 30 of the outer joint member 24. The constant velocity universal joint 6 is fixed to the hub wheel 1 by tightening with. The wheel bearing 20 has a structure in which the inner ring 2 is prevented from coming off by the caulking portion 11 and is integrated with the hub wheel 1, so that it can be separated from the constant velocity universal joint 6.

  In the concave-convex fitting structure M described above, as shown in FIGS. 3A and 3B, the press-fitting of the stem portion 30 is started upstream of the concave portion 39 of the shaft hole 38 of the hub wheel 1 in the insertion direction of the stem portion 30. The guide part 43 which guides is provided. In the guide portion 43, a concave portion 44 having the same phase as the concave portion 39 and larger than the convex portion 37 of the stem portion 30 is formed. That is, a gap m is formed between the convex portion 37 and the concave portion 44 (see FIG. 3B). When the stem portion 30 of the outer joint member 24 is press-fitted into the hub wheel 1 by the guide portion 43, the convex portion 37 of the stem portion 30 can be guided so as to be surely press-fitted into the concave portion 39 of the hub wheel 1. Thus, stable press-fitting is possible, and misalignment and tilting during press-fitting can be prevented.

  Here, as shown in FIGS. 4A and 4B, the circumferential dimension of the aforementioned concave portion 39 is set smaller than that of the convex portion 37. Thereby, the recessed part 39 has the interference n with respect only to the circumferential direction side wall part 47 of the convex part 37 [refer FIG.4 (B)]. On the other hand, the radial dimension of the concave portion 39 is set larger than that of the convex portion 37. Accordingly, a gap p is provided between a portion of the convex portion 37 excluding the circumferential side wall portion 47, that is, between the radial front end portion 48 of the convex portion 37 and the concave portion 39.

  As shown in FIGS. 5A and 5B, when the stem portion 30 of the outer joint member 24 is press-fitted into the shaft hole 38 of the hub wheel 1, the concave portion of the shaft hole 38 is formed by the circumferential side wall portion 47 of the convex portion 37. The surface is cut slightly, and the side wall in the circumferential direction of the convex portion 37 is accompanied by a slight plastic deformation or elastic deformation of the concave portion forming surface by the circumferential side wall portion 47 of the convex portion 37. A recess 40 to which the shape of the portion 47 is transferred is formed.

  At this time, the circumferential side wall portion 47 of the convex portion 37 bites into the concave portion forming surface so that the inner diameter of the hub wheel 1 is slightly expanded, and relative movement in the axial direction of the convex portion 37 is allowed. Is done. When the axial relative movement of the convex portion 37 stops, the shaft hole 38 of the hub wheel 1 is reduced in diameter to return to the original diameter. As a result, it is possible to tightly bond and integrate the outer joint member 24 and the hub wheel 1 together in the entire fitting contact region X between the convex portion 37 and the concave portion 40. In addition, since the radial front end portion 48 of the convex portion 37 does not have a fastening margin with the concave portion 39, the shape of the radial front end portion 48 of the convex portion 37 is not transferred to the concave portion 39.

  In this manner, the gap in which the fitting portion of the stem portion 30 and the hub wheel 1 is loosely formed in the radial direction and the circumferential direction is caused by the concave-convex fitting structure M in which the fitting contact region X of the convex portion 37 and the concave portion 40 is in close contact. Is not formed, the fitting contact part whole area X contributes to rotational torque transmission, and stable torque transmission is possible, and an unpleasant rattling noise can be prevented over a long period of time. In addition, since the strength of the torque transmission region is improved because the fitting contact region X is in close contact, the vehicle bearing device can be reduced in weight and size.

  Moreover, since the recessed part 39 which has the interference allowance n is previously formed in the press-fitting location of the convex part 37, a press-fit load is made lower than the case where the stem part 30 is press-fitted in the shaft hole in which the recessed part 39 is not formed. And does not require a large press-fit load. For this reason, at the time of assembling a vehicle by an automobile manufacturer, the wheel bearing 20 is attached to the knuckle extending from the suspension device of the vehicle body, and then pulled into the shaft hole 38 of the hub wheel 1 by the pulling force by the bolt member 32 of the tightening structure N. The stem portion 30 of the outer joint member 24 can be press-fitted, and the constant velocity universal joint 6 can be easily assembled to the wheel bearing 20. As a result, workability in assembling to the vehicle body is improved, and damage to parts during assembly can be prevented.

  Note that when the stem portion 30 of the outer joint member 24 is press-fitted into the shaft hole 38 of the hub wheel 1, the surface hardness of the convex portion 37 is preferably larger than the surface hardness of the concave portion 39. For example, the difference between the surface hardness of the convex portion 37 and the surface hardness of the concave portion 39 is set to 20 or more in HRC. Thereby, the shape of the circumferential side wall part 47 of the convex part 37 can be easily transcribe | transferred to the other party recessed part formation surface by the plastic deformation and cutting process at the time of press injection. The surface hardness of the convex portion 37 is preferably 50 to 65 in HRC, and the surface hardness of the concave portion 39 is preferably 10 to 30 in HRC.

  Between the shaft hole 38 of the hub wheel 1 and the stem portion 30 of the outer joint member 24, an accommodating portion 46 for accommodating the protruding portion 45 generated by the transfer of the convex shape by press-fitting is provided [FIG. ) And FIG. 5 (A)]. Accordingly, the protruding portion 45 generated by the transfer of the convex shape by press-fitting can be held in the accommodating portion 46, and the protruding portion 45 can be prevented from entering the vehicle outside the apparatus. By holding the protruding portion 45 in the accommodating portion 46, the removal processing of the protruding portion 45 becomes unnecessary, the work man-hour can be reduced, workability can be improved, and cost can be reduced. .

  The overall configuration of the wheel bearing device in this embodiment is as described above, but the structure for preventing the bolt member 32 from loosening, which is a characteristic configuration, will be described below.

  In the tightening structure N with the bolt member 32 shown in FIG. 1, the flange portion 41 located at the base portion of the head portion 51 of the bolt member 32 is in a state of being seated on the seat surface 36 of the concave portion 35 of the hub wheel 1. At this time, as shown in FIG. 6, the flange portion 41 of the bolt member 32 is disposed in the concave portion 35 of the hub wheel 1 and is surrounded by the peripheral wall portion 49 of the concave portion 35. On the other hand, the loosening prevention structure of the bolt member 32 includes a structure in which the caulking portion 50 of the hub wheel 1 is engaged with the notch portion 42 of the flange portion 41 of the bolt member 32.

  That is, in this loosening prevention structure of the bolt member 32, as shown in FIGS. 7A and 7B, the flange portion 41 located at the base portion of the head portion 51 of the bolt member 32 has a notch portion 42 having a flat surface. Form. In this embodiment, the case where the notch portions 42 are provided at two locations, ie, the uppermost end portion and the lowermost end portion of the flange portion 41 is illustrated. However, if simplification of workability is taken into consideration, One place may be sufficient. Further, the position where the notch 42 is provided may be any position in the circumferential direction, and is arbitrary.

  8A and 8B, the peripheral wall portion 49 of the concave portion 35 of the hub wheel 1 with respect to the flange portion 41 of the bolt member 32 seated on the seat surface 36 of the concave portion 35 of the hub wheel 1. Caulking. That is, the caulking portion 50 is formed by plastically deforming the peripheral wall portion 49 located on the outer periphery of the notch portion 42 formed in the flange portion 41 toward the notch portion 42, and the caulking portion 50 is notched. Engage with part 42.

  Thus, the engagement state of the caulking portion 50 of the peripheral wall portion 49 of the hub wheel 1 with the notch portion 42 of the flange portion 41 of the bolt member 32, that is, pressing the caulking portion 50 against the flat surface of the notch portion 42. With the contact, rotation of the bolt member 32 in the loosening direction can be restricted between the bolt member 32 and the hub wheel 1. As a result, the fastening state between the wheel bearing 20 and the constant velocity universal joint 6 can be maintained for a long time.

  In this embodiment, the case where the notch part 42 of the flange part 41 of the bolt member 32 is provided in two places of the outer peripheral part of the flange part 41 is illustrated. In addition, this notch part 42 may be provided in two or more places, and the peripheral wall part 49 of the recessed part 35 of the hub wheel 1 may be caulked by the notch parts 42 in the plurality of places. Thus, if the engagement part of the notch part 42 and the caulking part 50 is made into multiple places, the site | part which controls the rotation of the bolt member 32 in the loosening direction will be in multiple places. As a result, the rotation of the bolt member 32 in the loosening direction can be reliably restricted.

  Further, it is preferable that the peripheral wall portion 49 of the concave portion 35 of the hub wheel 1 is not heat-treated and has a surface hardness of HRC35 or less. Thus, if the numerical range of the surface hardness of the peripheral wall part 49 is prescribed | regulated, the caulking of the peripheral wall part 49 will become easy, and workability | operativity can be improved when restrict | limiting rotation of the bolt member 32 in the loosening direction.

  In the concave-convex fitting structure M described above, a case where only the circumferential side wall portion 47 of the convex portion 37 is set to have a tightening allowance n has been described, but FIGS. 9A and 9B and FIG. (A) As shown in (B), not only the circumferential side wall portion 47 of the convex portion 37 but also the portion including the radial tip portion 48, that is, the region extending from the mountain-shaped abdominal portion of the convex portion 37 to the top of the mountain shape. The tightening allowance n may be set as follows. In this case, the concave portion 39 is set to be smaller than the convex portion 37 so that the entire region of the concave portion 39 has an interference n with respect to the circumferential side wall portion 47 and the radial tip portion 48 of the convex portion 37. That is, in order to set the concave portion 39 smaller than the convex portion 37, the circumferential dimension and the radial dimension of the concave portion 39 may be made smaller than the convex portion 37.

  Also in this case, when the stem portion 30 of the outer joint member 24 is guided into the hub wheel 1 while being guided by the guide portion 43, the concave portion forming surface is slightly changed by the circumferential side wall portion 47 and the radial tip portion 48 of the convex portion 37. The circumferential direction of the convex portion 37 on the concave portion forming surface is accompanied by a slight plastic deformation and elastic deformation of the concave portion forming surface by the circumferential side wall portion 47 and the radial tip portion 48 of the convex portion 37. A recess 40 to which the shapes of the side wall 47 and the radial tip 48 are transferred is formed.

  At this time, the circumferential side wall portion 47 and the radial front end portion 48 of the convex portion 37 bite into the concave portion forming surface so that the inner diameter of the hub wheel 1 is slightly expanded, and the axial direction of the convex portion 37 is reached. Relative movement is allowed. When the axial relative movement of the convex portion 37 is stopped, the shaft hole 38 of the hub wheel 1 is reduced in diameter to return to the original diameter. Thereby, it can contact | adhere in the fitting contact site | part whole region X of the convex part 37 and the recessed part 40, and the outer joint member 24 and the hub ring 1 can be firmly couple | bonded and integrated.

  In addition, when setting so that it may have interference allowance n only with respect to the circumferential direction side wall part 47 of the convex part 37, it has interference allowance n with respect to the circumferential direction side wall part 47 and radial direction front-end | tip part 48 of the convex part 37. In comparison with the case of setting in this way, the former set so as to have a tightening allowance n only for the circumferential side wall portion 47 of the convex portion 37 can further reduce the press-fitting load.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

1 Inner member (hub ring)
2 Inner member (inner ring)
3, 4 Rolling element 5 Outer member (outer ring)
6 Constant Velocity Joint 7, 8 Inner raceway surface 13, 14 Outer raceway surface 20 Wheel bearing 24 Outer joint member 30 Stem portion 32 Bolt member 35 Concave portion 36 Seat surface 41 Flange portion 42 Notch portion 49 Circumferential wall portion 50 Caulking Part

Claims (3)

An outer member in which a double row outer raceway surface is formed on the inner peripheral surface, and an inner member composed of a hub wheel and an inner ring, the outer member having a double row inner raceway surface facing the outer raceway surface on the outer peripheral surface; A wheel bearing comprising a double row rolling element interposed between an outer raceway surface of the outer member and an inner raceway surface of the inner member; a hub wheel of the wheel bearing and a constant velocity universal joint In the wheel bearing device in which the outer joint member is fastened through the bolt member,
By seating the flange portion of the head portion of the bolt member on the seat surface of the concave portion of the hub wheel, and by crimping the peripheral wall portion of the concave portion on the notch portion formed on the outer peripheral portion of the flange portion, A wheel bearing device, wherein a notched portion is engaged with a caulking portion of the peripheral wall portion.   The wheel bearing device according to claim 1, wherein the notch portion of the flange portion of the bolt member is provided at a plurality of locations on the outer peripheral portion of the flange portion.   3. The wheel bearing device according to claim 1, wherein the peripheral wall portion of the concave portion of the hub wheel is not heat-treated and has a surface hardness of HRC35 or less.

Images