JP2012096748A - Rolling bearing device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device for a wheel for reducing the weight of a constant velocity joint, preventing the occurrence of abnormal noises due to relative slip between the end face of the outer ring of the constant velocity joint and the end face of the hub shaft of a hub wheel, and improving a structure of fastening the hub shaft of the hub wheel to the constant velocity joint.SOLUTION: The hub shaft 23 has a through-hole 34 in the axial direction. On the end face 72 of the joint outer ring 70 of the constant velocity joint 60, a connection shaft section 73 is constructed which has a screw hole and which is formed in such a positional relationship as to be located between rolling elements 51, 52 of a double-row rolling bearing in the state that an protruded engaging part 77A is assembled on the outer peripheral face. A washer faced bolt 80 has a diameter-enlarging part for diameter-enlarging the protruded engaging part 77A of the connection shaft section 73 to engage with the inner peripheral face of the through-hole 34 of the hub shaft 23 in a bitten-in state when fastening the hub shaft 23 to the connection shaft section 73.

Description

  The present invention relates to a wheel rolling bearing device. More specifically, the present invention relates to a wheel rolling bearing device in which a hub shaft of a hub wheel and a constant velocity joint are connected so that torque can be transmitted.

2. Description of the Related Art Conventionally, a configuration as disclosed in Patent Document 1 is known as one of the configurations of a wheel rolling bearing device in which a hub shaft of a hub wheel and a constant velocity joint are connected so that torque can be transmitted.
As shown in FIG. 5, the configuration of the wheel rolling bearing device 510 shown in Patent Document 1 is as follows. A double row angular ball bearing 530 as a rolling bearing provided with an inner ring 531, an outer ring 540, and balls (rolling elements) 551 and 552 is assembled on the outer peripheral surface of the hub shaft 523 of the hub wheel 520. On the other hand, an outer ring shaft portion 573 protrudes integrally from an end surface 572 of the outer ring tube portion 571 of the joint outer ring 570 of the constant velocity joint 560 to which the end portion of the drive shaft 561 is coupled. An internal spline 524 is formed on the inner peripheral surface of the inner hole of the hub shaft 523 of the hub wheel 520, and an outer spline 574 that meshes with the inner spline 524 is formed on the outer peripheral surface of the outer ring shaft portion 573. .
The end surface of the hub axle 523 of the hub wheel 520 and the end surface 572 of the joint outer ring 570 of the constant velocity joint 560 are brought into contact with each other. The outer ring shaft portion 573 is fitted into the inner hole of the hub shaft 523 of the hub wheel 520 while the inner and outer splines 524 and 574 are engaged with each other. Then, the tightening nut 576 is fastened to the male screw portion 575 protruding from the tip of the outer ring shaft portion 573. As a result, the hub wheel 520 and the constant velocity joint 560 are coupled so as to be able to transmit torque in a state where pressure is applied to the double row angular ball bearings 530. Further, in order to prevent loosening due to vibration or the like, after tightening the tightening nut 576, the tip of the tightening nut 576 is plastically deformed.

JP 2002-29210 A

However, when the outer ring shaft portion 573 of the wheel rolling bearing device 510 of Patent Document 1 is formed, there is a problem that the entire constant velocity joint 560 becomes heavy.
Further, when a large torque exceeding an assumption is applied, such as when suddenly starting, between the end surface 572 of the joint outer ring 570 of the constant velocity joint 560 and the end surface of the hub shaft 523 of the hub wheel 520, Relative slip (slip including torsion) may occur, and abnormal noise may occur. Further, there is a possibility that the fastening structure due to plastic deformation of the fastening nut 576 may be lowered due to vibration of the hub wheel 520 or the like, so that the fastening structure has room for further improvement.

  Thus, the present invention was devised in view of such a point, and the problem to be solved by the present invention is to reduce the weight of the constant velocity joint for the wheel rolling bearing device, and so on. The relative slip between the end face of the outer ring of the speed joint and the end face of the hub axle of the hub wheel can be suppressed, and the occurrence of abnormal noise due to the relative slip of the part can be prevented. The purpose is to improve the fastening structure between the hub axle of the hub wheel and the constant velocity joint.

In order to solve the above-described problems, the wheel rolling bearing device of the present invention takes the following means.
First, a wheel rolling bearing device according to a first aspect of the present invention is a wheel rolling bearing device in which a hub shaft of a hub wheel and a constant velocity joint are connected so as to be able to transmit torque, and the end surface of the hub shaft of the hub wheel is Side face splines that connect the hub wheel and the constant velocity joint so that torque can be transmitted by meshing with the end surface of the joint outer ring of the constant velocity joint that is abutted against the end surface of the hub axle of the hub wheel. And one of the inner raceway surfaces of the double row rolling bearing is formed on a part of the outer peripheral surface of the hub shaft, and the inner raceway of the double row rolling bearing is formed on the outer peripheral surface of the hub shaft. An annular inner ring constituting the other of the surfaces is disposed, and on the outer peripheral side of the inner raceway surface, the outer raceway of the double row rolling bearing on the inner peripheral surface corresponding to the inner raceway surface. surface An outer ring is arranged, and rolling elements are assembled between the inner raceway surface formed on the hub shaft and the inner ring and the outer raceway surface formed on the outer ring to constitute a rolling bearing. The hub shaft is formed with a through hole in the axial direction, and an end surface of the joint outer ring of the constant velocity joint is formed with a connecting shaft portion that protrudes toward the through hole of the hub shaft. The connecting shaft portion is formed with a screw hole in the axial center portion thereof, and a convex engagement portion engageable with the inner peripheral surface of the through hole of the hub shaft is mounted on the outer peripheral surface in the assembled state. It is formed as a positional relationship located between the rolling elements of the double row rolling bearing, the connecting shaft portion is inserted from one end side of the through hole of the hub shaft, and the bolt is inserted from the other end side of the through hole of the hub shaft The hub shaft and the connecting shaft part are coupled by fastening And the bolt expands the convex engaging portion of the connecting shaft portion at the time of fastening, and the convex engaging portion engages with the inner peripheral surface of the through hole of the hub shaft. It has an enlarged diameter part.

  According to the first aspect of the invention, the end surface of the hub shaft of the hub wheel and the end surface of the joint outer ring of the constant velocity joint that abuts on the end surface of the hub shaft of the hub wheel are engaged with each other, thereby the hub wheel and the constant velocity joint. The side face splines are connected to each other so that torque can be transmitted. Therefore, due to relative slippage between the contact surfaces between the end surface of the joint outer ring of the constant velocity joint and the end surface of the hub axle of the hub wheel when a large torque exceeding the assumption is applied, such as when suddenly starting. Generation of abnormal noise can be prevented.

  In addition, a connecting shaft portion is formed on the end face of the joint outer ring of the constant velocity joint so as to project toward the through hole of the hub shaft. By fastening the connecting shaft portion and a bolt, the hub wheel and the constant velocity joint are formed. Since the outer ring shaft portion that integrally projects from the end face of the joint outer ring of the constant velocity joint is not formed as in the prior art, the weight of the constant velocity joint can be reduced.

  In addition, the fastening structure of the hub axle of the hub wheel and the constant velocity joint is improved. That is, the connecting shaft portion is formed with a screw hole in the axial center portion thereof, and on the outer peripheral surface, a convex engaging portion that can be engaged with the inner peripheral surface of the through hole of the hub shaft is assembled in a double row. It is formed as a positional relationship located between the rolling elements of the rolling bearing. The bolt has an enlarged diameter portion, and when tightened, the diameter of the convex engaging portion of the connecting shaft portion is increased, and the convex engaging portion is bitten into the inner peripheral surface of the through hole of the hub shaft. Engage with. Therefore, the free force between the bolt and the constant velocity joint can be suppressed by the engagement of the convex engaging portion, and the tightening torque of the bolt can be reduced. In addition, since it is not necessary to perform caulking work as in the prior art, the work cost can be reduced. In addition, since the bolt expands the convex engaging portion of the connecting shaft portion during fastening, the hub shaft has an action of expanding in the radial direction. Here, in the assembled state where the convex engaging portion is engaged with the inner peripheral surface of the through hole of the hub shaft, the inner raceway surface of the rolling element is arranged because of the positional relationship between the rolling elements of the double row rolling bearing. There is no pressure. Therefore, a smooth rolling state of the rolling element can be maintained.

  Next, in the rolling bearing device for wheels according to the second invention, in the first invention described above, the axial length of the connecting shaft portion is set to be longer than the movement amount in which the constant velocity joint is allowed in the axial direction. It is characterized by being.

  According to the second aspect of the invention, the axial length of the connecting shaft portion is set to be longer than the movement amount in which the constant velocity joint is allowed in the axial direction. As a result, the constant velocity joint can be prevented from falling off the hub wheel even if the bolt falls off during traveling, and the constant velocity joint can be idled.

  According to the present invention, the rolling bearing device for a wheel achieves weight reduction of the constant velocity joint by taking the means of each of the above inventions, and the relative relationship between the end surface of the outer ring of the constant velocity joint and the end surface of the hub shaft of the hub wheel. Slip can be suppressed, abnormal noise caused by relative slip of the part can be prevented, and the fastening structure of the hub axle of the hub wheel and the constant velocity joint can be improved. .

It is sectional drawing which showed the assembly | attachment state of each component of the rolling bearing device for wheels which concerns on Example 1 from the side of the axial direction. FIG. 3 is an exploded cross-sectional view in which the components of the wheel rolling bearing device according to the first embodiment are arranged on the center of the hub shaft. It is the fragmentary sectional view which showed before the assembly | attachment of each component of the rolling bearing device for wheels which concerns on Example 1. FIG. (A) The figure is a fragmentary sectional view showing the constant velocity joint and the bolt being fastened. (B) The figure is a partial expanded sectional view which showed the fastening part of the constant velocity joint and the bolt in detail. It is the fragmentary sectional view which showed after the assembly | attachment of each component of the rolling bearing device for wheels which concerns on Example 1. FIG. (A) The figure is the fragmentary sectional view which showed the constant velocity joint and the bolt after fastening. (B) The figure is a partial expanded sectional view which showed the fastening part of the constant velocity joint and the bolt in detail. It is sectional drawing which showed the assembly | attachment state of each component of the rolling bearing device for wheels which concerns on the past from the side of the axial direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, a wheel rolling bearing device according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the wheel rolling bearing device 10 according to the first embodiment generally includes a hub wheel 20, a double row angular ball bearing 30 as a rolling bearing, and a constant velocity joint 60. And a seated bolt 80.

The hub wheel 20 will be described.
As shown in FIGS. 1 and 2, the hub wheel 20 integrally includes a cylindrical hub shaft 23 and a flange 21 formed on the outer peripheral surface near one end of the hub shaft 23. A plurality of hub bolts 22 for attaching a wheel (not shown) with a brake rotor (not shown) interposed therebetween are fixed to the flange 21 at a predetermined pitch and press-fitted.
A double row angular ball bearing 30 including an outer ring 40, an inner ring 31, a plurality of balls 51, 52 as rolling elements and cages 55, 56 is assembled on the outer periphery of the hub shaft 23.

In the first embodiment, the hub shaft 23 has a large-diameter shaft portion 25 formed on the flange 21 side, a smaller diameter than the large-diameter shaft portion 25, and a small-diameter formed continuously with the large-diameter shaft portion 25 and a stepped portion. The shaft portion 26 is integrally formed. An inner raceway surface 32 corresponding to one outer raceway surface 41 of the outer ring 40 is formed on the outer peripheral surface of the large-diameter shaft portion 25.
Further, after the inner ring 31 in which the inner raceway surface 33 corresponding to the other outer raceway surface 42 of the outer ring 40 is formed on the outer circumference surface is fitted into the outer circumference surface of the small-diameter shaft portion 26 of the hub shaft 23, the small-diameter shaft portion 26. The inner ring 31 is fixed between the stepped portion and the widened claw portion 27 by forming the widened claw portion 27 that is widened by caulking the tip portion of the inner ring 31.
Moreover, the fitting part 35 with which a wheel is fitted is formed in the edge part by which the flange 21 of the hub wheel 20 is formed. In addition, a through hole 34 penetrating in the axial direction is formed at the center of the hub shaft 23. Further, the bolt seat surface 36 facing the seat surface portion 84 formed on the outer periphery of the head 81 of the seated bolt 80 is provided on the outer periphery of the through hole 34 on the side where the fitting portion 35 is formed in the end portion of the hub shaft 23. Is configured.

Further, a plurality of balls 51, 52 and a plurality of these balls 51, 52 are provided between both outer raceway surfaces 41, 42 of the outer ring 40 and both inner raceway surfaces 32, 33 on the hub shaft 23 side. Are respectively assembled. Further, a fixed flange 45 is integrally formed on the outer peripheral surface of the outer ring 40 to be attached to a vehicle body side member (knuckle or carrier) supported by a vehicle suspension device (not shown) with a bolt.
Here, the small diameter shaft portion 26 side facing the constant velocity joint 60 in the first embodiment corresponds to “one end side of the through hole of the hub shaft” in the present invention, and the bolt seat surface 36 in the through hole 34 of the hub shaft 23. The side on which is configured corresponds to “the other end side of the through hole of the hub shaft” in the present invention.

As shown in FIG. 2, the through hole 34 has a connecting shaft portion 73 of the constant velocity joint 60 facing the constant velocity joint 60 on the small diameter shaft portion 26 side (one end side of the through hole of the hub shaft). ) And a bolt 80 with a seat is inserted from the side where the bolt seat surface 36 of the hub shaft 23 is formed (the other end side of the through-hole of the hub shaft), and both are fastened, whereby the hub wheel 20 And the constant velocity joint 60.
The shape of the opening diameter 34A of the through hole 34 on the small diameter shaft portion 26 side (one end side of the through hole of the hub shaft) of the hub shaft 23 facing the constant velocity joint 60 is a clearance that allows the connecting shaft portion 73 to be easily inserted. It is formed with a fit. Further, the intermediate hole diameter 34B of the portion located between the balls 51, 52 of the double row angular ball bearing 30 is formed with a fitting tolerance larger than the intermediate fit and smaller than the clearance fit, and the connecting shaft portion 73 is formed. It is set as the structure inserted without gap. Further, the opening diameter 34C of the through hole 34 of the hub shaft 23 on the side where the bolt seat surface 36 is formed (the other end side of the through hole of the hub shaft) can be easily inserted into the shaft portion of the seated bolt 80. It is formed with a hole diameter.

The constant velocity joint 60 will be described.
As shown in FIGS. 1 and 2, the constant velocity joint 60 uses a known constant velocity joint called a Zepper type or a barfield type, and is connected to one end of the drive shaft 61 integrally. The joint inner ring 62, the joint outer ring 70, the joint inner ring 62, the plurality of balls 63 disposed between the joint outer rings 70, and the cage 64 that holds the plurality of balls 63. Yes. The joint outer ring 70 of the constant velocity joint 60 includes a bowl-shaped outer ring cylinder part 71 and a connecting shaft part 73 integrally protruding from the center of the outer peripheral end surface 72 of the outer ring cylinder part 71. A hole is formed at the tip, and an internal thread 75 is formed on the inner peripheral surface.

The connecting shaft portion 73 will be described in more detail.
As shown in FIG. 2, the shaft diameter 73A of the connecting shaft portion 73 is formed with a fitting tolerance larger than the intermediate fit and smaller than the clearance fit in relation to the intermediate hole diameter 34B of the through hole 34 of the hub shaft 23. Has been. Accordingly, the connecting shaft portion 73 is configured to be inserted into the through hole 34 without a gap.
In addition, a cylindrical portion 77 further extending from the female screw portion 75 is formed at the distal end portion of the connecting shaft portion 73, and a convex portion is formed to protrude in the radial direction on the outer peripheral surface, and the through hole of the hub shaft 23 is formed. A convex engaging portion 77A that can engage with the inner peripheral surface of 34 is formed. In the first embodiment, knurling is performed as a convex portion of the convex engaging portion 77A. Here, the convex engaging portion 77A may be serrated. The convex engaging portion 77A is formed as a positional relationship between a plurality of balls 51 and 52 configured as rolling elements in a state where the double row angular ball bearings 30 are assembled to the hub shaft 23. Has been. Further, the inner peripheral surface of the cylindrical portion 77 is formed with a hole diameter 73B that comes into contact with a diameter-expanded portion 85 of a seated bolt 80 described later.

  As shown in FIG. 2, the axial length 73 </ b> C of the connecting shaft portion 73 is set to be longer than the movement amount in which the constant velocity joint 60 is allowed in the axial direction. The amount of movement that the constant velocity joint 60 is allowed in the axial direction is as follows. That is, a constant velocity joint 60 is formed on one end side of the drive shaft 61 in the vehicle. The constant velocity joint 60 is a fixed member that only gives an axis bending angle (joint angle) to the drive shaft 61 and does not have a sliding function. It is a constant velocity joint. On the other hand, a constant velocity joint (not shown) configured on the other end side of the drive shaft 61 has a function of allowing the shaft length to change by changing the length of the drive shaft in accordance with the stroke of the vehicle suspension. A constant velocity joint is constructed. The connecting shaft portion 73 is set to be longer than the movement amount in which the constant velocity joint 60 is allowed in the axial direction by changing the axial length according to the stroke of the suspension of the vehicle.

As shown in FIGS. 1 and 2, the connecting shaft portion 73 is inserted from the through hole 34 of the hub shaft 23 from the small diameter shaft portion 26 side. On the other hand, by inserting a bolt 80 with a seat, which will be described later, from the side where the bolt seat surface 36 is formed in the through hole 34 of the hub shaft 23, and screwing and fastening with the female screw portion 75 of the connecting shaft portion 73, the hub shaft 23. And the connecting shaft portion 73 are coupled.
An annular portion is provided between the end surface of the hub shaft 23 (the end surface of the widened claw portion 27) and the end surface 72 of the joint outer ring (outer ring cylinder portion 71) 70 of the constant velocity joint 60 that is abutted against the end surface. ing. Side face splines 28 and 78 that connect the hub wheel 20 and the constant velocity joint 60 so that torque can be transmitted are formed by meshing the annular portions with each other. As a result, the hub wheel 20 and the constant velocity joint 60 are coupled so as to transmit torque.

The seat bolt 80 will be described.
As shown in FIG. 2, the seated bolt 80 has a male screw portion that can be screwed with a female screw portion 75 formed in a connecting shaft portion 73 formed in the joint outer ring 70 of the constant velocity joint 60 described above at the tip portion. 83 is formed. A seat surface portion 84 that abuts against the bolt seat surface 36 of the hub shaft 23 is formed on the outer periphery of the head 81 of the seat bolt 80.
As shown in FIGS. 3 and 4, the intermediate portion of the shaft portion of the seated bolt 80 is formed in a step shape having a different shaft diameter. That is, when the seated bolt 80 is fastened, the diameter of the convex engaging portion 77A of the connecting shaft portion 73 is increased, and the convex engaging portion 77A bites into the inner peripheral surface of the through hole 34 of the hub shaft 23. An enlarged diameter portion 85 to be engaged is formed.
As shown in FIG. 4, the enlarged diameter portion 85 has a male thread portion so that the convex engagement portion 77 </ b> A of the connecting shaft portion 73 of the constant velocity joint 60 bites into the inner peripheral surface of the through hole 34 of the hub shaft 23. The diameter is larger than the shaft diameter of 83 and larger than the diameter 73B of the inner periphery of the shaft end of the connecting shaft portion 73.
The formation position of the enlarged diameter portion 85 in the axial direction of the seated bolt 80 is as follows. That is, as shown in FIG. 4, both the connecting shaft portion 73 of the constant velocity joint 60 and the seated bolt 80 are fastened in the through hole 34 of the hub shaft 23, and the hub wheel 20 and the constant velocity joint 60 are coupled. In the assembled state, the convex engaging portion 77A of the connecting shaft portion 73 is expanded in diameter so that the portion of the intermediate hole diameter 34B of the through hole 34 of the hub shaft 23 (between the balls 51 and 52 of the double row angular ball bearing 30). Of the part located at the inner peripheral surface).
In addition, an inclined surface 87 is formed at the boundary between the diameter-expanded portion 85 and the male screw portion 83 so as to gradually expand from the shaft diameter of the male screw portion 83 to the diameter-expanded portion 85.
As the seated bolt 80 and the connecting shaft portion 73 are fastened, the hole diameter 73B of the cylindrical portion 77 of the connecting shaft portion 73 expands to the height of the enlarged diameter portion 85 while riding on the inclined surface 87, and the convex engagement The joining portion 77A engages with the inner peripheral surface of the portion of the through hole 34 of the hub shaft 23 having the intermediate hole diameter 34B in a state of being bitten. The seated bolt 80 corresponds to the “bolt” of the present invention.

The wheel rolling bearing device 10 according to the first embodiment is configured as described above.
Accordingly, during traveling of the vehicle, the torque of the drive shaft 61 is sequentially transmitted to the joint inner ring 52, the plurality of balls 63, and the joint outer ring 70 of the constant velocity joint 60, and the joint outer ring 70 is rotated in the same direction as the drive shaft 61. The The torque transmitted to the constant velocity joint 60 is the side of the mutual annular portion between the end surface of the hub shaft 23 of the hub wheel 20 (the end surface of the widened claw portion 27) and the end surface 72 of the joint outer ring 70 of the constant velocity joint 60. The transmission is transmitted to the hub wheel 20 by the meshing of the face splines 28 and 78, and the wheels are driven to rotate.

  Thus, according to the rolling bearing device for a wheel of the first embodiment, the joint outer ring 70 of the constant velocity joint 60 that abuts the end surface of the hub shaft 23 of the hub wheel 20 and the end surface of the hub shaft 23 of the hub wheel 20. The side face splines 28 and 78 to which the hub wheel 20 and the constant velocity joint 60 are connected so as to be able to transmit torque are formed by meshing with each other. Therefore, when a large torque exceeding the assumption is applied, such as when suddenly starting, a relative relationship between the end surface of the joint outer ring 70 of the constant velocity joint 60 and the end surface of the hub shaft 23 of the hub wheel 20 is relative to each other. The generation of abnormal noise due to slipping can be prevented.

  Further, a connecting shaft portion 73 is formed on the end face of the joint outer ring 70 of the constant velocity joint 60 so as to protrude toward the through hole 34 of the hub shaft 23, and the connecting shaft portion 73 and the seated bolt 80 are fastened. Since the hub wheel 20 and the constant velocity joint 60 are connected to each other, the outer ring shaft portion that integrally protrudes from the end face of the joint outer ring of the constant velocity joint is not formed as in the prior art. Can be achieved.

  Further, the fastening structure of the hub shaft 23 of the hub wheel 20 and the constant velocity joint 60 is improved. That is, the connecting shaft portion 73 is formed with a female threaded portion 75 and has a convex engaging portion 77 </ b> A protruding radially on the outer peripheral surface so as to be able to engage with the inner peripheral surface of the through hole 34 of the hub shaft 23. In the assembled state, the convex engaging portion 77A is formed as a positional relationship between the balls 51, 52 as rolling elements of the double row angular ball bearing 30. The seated bolt 80 has an enlarged diameter portion 85, and the diameter of the convex engaging portion 77 </ b> A of the connecting shaft portion 73 is increased during fastening so that the convex engaging portion 77 </ b> A is passed through the through hole 34 of the hub shaft 23. It engages in the state which digged into the inner peripheral surface. Therefore, the release force between the seated bolt 80 and the constant velocity joint 60 can be suppressed by the engagement of the convex engaging portion 77A, and the tightening torque of the seated bolt 80 can be reduced. In addition, since it is not necessary to perform caulking work as in the prior art, the work cost can be reduced. Further, the seated bolt 80 expands the convex engaging portion 77A of the connecting shaft portion 73 at the time of fastening, so that the hub shaft 23 has a function of expanding in the radial direction. Here, the convex engaging portion 77A is located between the balls 51 and 52 as rolling elements of the double row angular ball bearing 30 in the assembled state in which the convex engaging portion 77A is engaged with the inner peripheral surface of the through hole 34 of the hub shaft 23. Because of the relationship, the inner raceways of the balls 51 and 52 as rolling elements are not pressed. Therefore, the smooth rolling state of the balls 51 and 52 as the rolling elements can be maintained.

  Further, the axial length of the connecting shaft portion 73 is set to be longer than the amount of movement that the constant velocity joint 60 is allowed in the axial direction. Thereby, even if the seated bolt 80 falls off during traveling, the constant velocity joint 60 can be prevented from falling off the hub wheel 20, and the constant velocity joint 60 can be idled.

As mentioned above, although Embodiment of this invention was described in Example 1- Example 3, the rolling bearing device for wheels of this invention is not limited to this Embodiment, In the range which does not deviate from the summary of this invention, It can also be implemented in various forms.
For example, in the first embodiment, the case where the double-row angular contact ball bearing 30 is employed as the double-row rolling bearing is illustrated, but the present invention can be implemented using a double-row tapered roller bearing. .

DESCRIPTION OF SYMBOLS 10 Rolling bearing apparatus for wheels 20 Hub wheel 21 Flange 22 Hub bolt 23 Hub shaft 25 Large-diameter shaft portion 26 Small-diameter shaft portion 27 Wide-opening constriction portion 28 Side face spline 30 Angular ball bearing 31 Inner ring 32 Inner raceway surface 33 Inner raceway surface 34 Through Hole 34A Open hole diameter 34B Intermediate hole diameter 34C Open hole diameter 35 Fitting portion 36 Bolt seat surface 40 Outer ring 41 Outer raceway surface 42 Outer raceway surface 45 Fixing flange 51 Ball 52 Ball 55 Cage 56 Cage 60 Constant velocity joint 61 Drive shaft 62 Joint Inner ring 63 Ball 64 Cage 70 Joint outer ring 71 Outer ring cylinder part 72 End face 73 Connection shaft part 73A Shaft diameter 73B Hole diameter 73C Shaft length 75 Female thread part 77 Cylindrical part 77A Convex engagement part 78 Side face spline 80 Seated bolt 81 Head 82 Shaft part 83 Male thread part 84 Bearing surface part 85 Diameter expansion part

Claims (2)

A wheel rolling bearing device in which a hub shaft of a hub wheel and a constant velocity joint are coupled so as to transmit torque,
The hub wheel and the constant velocity joint can transmit torque by engaging the end surface of the hub shaft of the hub wheel and the end surface of the joint outer ring of the constant velocity joint that abuts on the end surface of the hub shaft of the hub wheel. Side face splines connected to each are formed,
One part of the inner raceway surface of the double row rolling bearing is formed on a part of the outer peripheral surface of the hub shaft, and the other inner raceway surface of the double row rolling bearing is constituted on the outer peripheral surface of the hub shaft. An annular inner ring is disposed, and on the outer peripheral side of the inner raceway surface, the outer raceway surface of the double row rolling bearing is configured on the inner circumference surface corresponding to the inner raceway surface. An outer ring is disposed, and rolling elements are assembled between the inner raceway surface formed on the hub shaft and the inner ring and the outer raceway surface formed on the outer ring to constitute a rolling bearing,
The hub shaft has a through hole formed in the axial direction,
The end face of the joint outer ring of the constant velocity joint is configured with a connecting shaft portion formed to project toward the through hole of the hub shaft,
The connecting shaft portion has a screw hole formed in the shaft center portion thereof, and a convex engagement portion that can be engaged with the inner peripheral surface of the through hole of the hub shaft on the outer peripheral surface. Formed as a positional relationship between the rolling elements of the rolling bearings in a row,
The connecting shaft portion is inserted from one end side of the through hole of the hub shaft, and the hub shaft and the connecting shaft portion are coupled by fastening a bolt from the other end side of the through hole of the hub shaft,
The bolt expands the diameter of the convex engaging portion of the connecting shaft portion when tightened, and the diameter of the convex engaging portion engages with the inner peripheral surface of the through hole of the hub shaft engaged. The rolling bearing device for wheels characterized by having a part. It is a rolling bearing device for wheels according to claim 1,
The wheel rolling bearing device according to claim 1, wherein an axial length of the connecting shaft portion is set to be longer than an amount of movement of the constant velocity joint allowed in the axial direction.

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