JP2009078676A - Wheel supporting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel supporting device capable of transmitting torque to a hub shaft and an outer ring of a constant velocity joint satisfactorily by eliminating a caulked part of an end part of the hub shaft of a hub wheel and reducing weight and cost of the device effectively. <P>SOLUTION: In this wheel supporting device, a rolling bearing 20 is provided on an outer peripheral face of the hub shaft 13 of the hub wheel 10 to which a wheel is attached, and the hub shaft 13 and the outer ring 60 of the constant velocity joint 50 are mutually connected to transmit torque. Both side face splines 26, 62 meshing mutually are formed on an end face of an inner ring 21 of the rolling bearing 20 and an end face of a side wall part of the outer ring 60 of the constant velocity joint 50 which is butted on the end face of the inner ring 21, respectively. An external spline 18 and an internal spline 25 meshing mutually are formed on the outer peripheral face of the hub shaft 13 and an inner peripheral face of the inner ring 21 of the rolling bearing 20, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wheel support device in which a rolling bearing is provided on an outer peripheral surface of a hub shaft of a hub wheel to which a wheel is attached, and the hub shaft and an outer ring of a constant velocity joint are connected to transmit torque.

In this type of wheel support device, as shown in FIG. 3, the inner ring 121 of the rolling bearing 120 is fitted and inserted into the outer peripheral surface of the hub shaft 113 of the hub wheel 110, and the shaft end portion that forms the cylindrical shaft shape of the hub shaft 113 is formed. There is a structure in which the inner ring 121 is fixed to the outer peripheral surface of the hub shaft 113 by caulking toward the end surface (radially outward) of the inner ring 121 and forming a caulking portion 117.
Further, in order to connect the hub wheel 110 and the constant velocity joint 150 so that torque can be transmitted, the end surface of the caulking portion 117 of the hub shaft 113 and the side wall of the outer ring 160 of the constant velocity joint 150 that abuts against the end surface of the caulking portion 117. Both side face splines 126 and 162 meshing with each other are formed on the end surface of the portion 161, and the both side face splines 126 and 162 are meshed with each other so that the hub shaft 113 of the hub wheel 110 and the outer ring 160 of the constant velocity joint 150 Is connected by a connecting bolt 170 so that the hub wheel 110 and the constant velocity joint 150 are connected so as to be able to transmit torque (see, for example, Patent Document 1).
Japanese Unexamined Patent Publication No. 63-184501

By the way, after the inner ring 121 of the rolling bearing 120 is assembled to the outer peripheral surface of the hub shaft 113 of the hub wheel 110 by the caulking portion 117, the side face spline 126 is secured to the end surface of the caulking portion 117 by forging. Forming is a difficult task.
Further, when the side face spline 126 is formed by forging, there is a concern that an axial compressive force acts on the inner ring 121, thereby adversely affecting the raceway surface 122 of the inner ring 121.
Further, the quality assurance inspection of the side face spline 126 formed on the caulking portion 117 of the hub shaft 113 is also troublesome because the rolling bearing 120 including the inner ring 121 is assembled to the hub shaft 113. .

  In view of the above-described problems, the object of the present invention is to eliminate the caulking portion at the end of the hub shaft of the hub wheel, and to transmit torque favorably between the hub shaft and the outer ring of the constant velocity joint. Another object of the present invention is to provide a wheel support device that is highly effective in reducing costs.

In order to achieve the above object, a wheel support device according to claim 1 of the present invention is provided with a rolling bearing on an outer peripheral surface of a hub shaft of a hub wheel to which a wheel is attached, and the outer shaft of the hub shaft and a constant velocity joint. Is a wheel support device coupled to transmit torque,
Both side face splines that mesh with each other are formed on the end face of the inner ring of the rolling bearing and the end face of the side wall portion of the outer ring of the constant velocity joint that is abutted against the end face.
The outer peripheral surface of the hub shaft and the inner peripheral surface of the inner ring of the rolling bearing are respectively formed with external tooth splines and internal tooth splines that mesh with each other.

According to the above configuration, the torque on the constant velocity joint side is transmitted to the inner ring of the rolling bearing by meshing with the side face spline of the outer ring of the equivalent speed joint and the side face spline of the inner ring of the rolling bearing on the hub wheel side. Is transmitted to the hub shaft by meshing with the external splines of the outer peripheral surface of the hub shaft of the hub wheel.
In this way, the side face spline is formed on the end surface of the inner ring of the rolling bearing on the hub wheel side, and the inner spline is formed on the inner peripheral surface of the inner ring, thereby eliminating the caulked portion of the hub wheel end of the hub wheel. Thus, torque can be satisfactorily transmitted between the hub shaft and the outer ring of the constant velocity joint.
Further, the shaft length of the wheel support device can be shortened by the amount corresponding to the elimination of the caulking portion at the end of the hub shaft, thereby reducing the weight.
Furthermore, a side face spline can be easily formed on the end surface of the single inner ring constituting the hub wheel side rolling bearing, and an internal spline can be easily formed on the inner peripheral surface by forging or the like. Furthermore, after each spline is formed, quality assurance inspection can be easily performed in the state of a single inner ring, which is effective in reducing costs.

  Next, the best mode for carrying out the present invention will be described with reference to examples.

Example 1
A first embodiment of the present invention will be described with reference to FIGS.
1 is a side sectional view showing a wheel support device according to Embodiment 1 of the present invention. FIG. 2 is an enlarged side sectional view showing a meshing portion of both side face splines of the inner ring of the rolling bearing of the hub shaft and the outer ring of the constant velocity joint.
As shown in FIG. 1, the wheel support device according to the first embodiment includes a hub wheel 10, a double row angular ball bearing 20 as a rolling bearing, and a constant velocity joint 50.

As the constant velocity joint 50, a well-known constant velocity joint called a Zepper type or a bar field type is used. An inner ring 52 integrally connected to one end of the drive shaft 51; an outer ring 60; A plurality of balls 53 disposed between the outer rings 52 and 60 and a cage 54 that holds the plurality of balls 53 are provided.
A side face spline 62 is formed on the end surface of the side wall 61 of the outer ring 60 of the constant velocity joint 50.
Further, a connecting bolt 70 for connecting the hub wheel 10 and the constant velocity joint 50 integrally is projected at the center of the side wall 61 of the outer ring 60 of the constant velocity joint 50.

In the first embodiment, the connecting bolt 70 has a head portion 71 and a shaft portion 72 that are separate from the outer ring 60 of the constant velocity joint 50, and is provided at the center of the side wall portion 61 of the outer ring 60 of the constant velocity joint 50. Has a through hole 63.
Then, the shaft portion 72 of the connecting bolt 70 is fitted and inserted from the inner opening portion of the through hole 63 of the outer ring 60 of the constant velocity joint 50, and the shaft portion 72 reaches a position where the lower surface of the head portion 71 contacts the inner surface of the side wall portion 61. The shaft portion 72 of the connecting bolt 70 is protruded and fixed from the side wall portion 61 of the outer ring 60 of the constant velocity joint 50 by press-fitting the large diameter portion 72a of the base portion. A male screw portion 73 is formed at the tip of the shaft portion 72 of the connecting bolt 70, and a caulking groove 74 for preventing the tightening nut 75 from rotating is recessed in the male screw portion 73.

As shown in FIG. 1, the hub wheel 10 integrally includes a cylindrical hub shaft 13 and a flange 11 formed on the outer peripheral surface near one end of the hub shaft 13. A plurality of hub bolts 12 for attaching a wheel (not shown) with a brake rotor (not shown) interposed therebetween are fixed to the flange 11 at a predetermined pitch and press-fitted.
A double row angular ball bearing 20 including an outer ring 30, an inner ring 21, a plurality of balls 41, 42 as rolling elements and cages 45, 46 is assembled on the outer peripheral surface of the hub shaft 13. That is, in the first embodiment, the hub shaft 13 has a large-diameter shaft portion 15 formed on the flange 11 side, and has a suitably smaller diameter than the large-diameter shaft portion 15 and continuously with the large-diameter shaft portion 15 and a stepped portion. The formed small diameter shaft portion 16 is integrally provided. A track surface 22 corresponding to one track surface 31 of the outer ring 30 is formed on the outer peripheral surface of the large-diameter shaft portion 15.
Further, an inner ring 21 in which a raceway surface 23 corresponding to the other raceway surface 32 of the outer ring 30 is formed on the outer peripheral surface of the small-diameter shaft portion 16 of the hub shaft 13 is fitted. And between the both raceway surfaces 31 and 32 of the outer ring 30 of the hub wheel 10 and the both raceway surfaces 22 and 23 on the hub shaft 13 side, there are a plurality of balls 41, 42, and each of these plurality of balls 41. , 42 are respectively assembled.
In addition, a fixing flange 35 is integrally formed on the outer peripheral surface of the outer ring 30 to be attached to a vehicle body side member (knuckle or carrier) supported by a vehicle suspension device (not shown) with a bolt.

As shown in FIGS. 1 and 2, external splines 18 and internal splines 25 that mesh with each other are formed on the outer peripheral surface of the small-diameter shaft portion 16 of the hub shaft 13 and the inner peripheral surface of the inner ring 21. .
A side face spline 26 that meshes with a side face spline 62 on the end face of the side wall 61 of the outer ring 60 of the constant velocity joint 50 is formed on the end face of the inner ring 21.
The hub wheel 10 and the constant velocity joint 50 are integrally connected so as to transmit torque as follows.
Torque transmission of the inner ring 21 to the small-diameter shaft portion 16 of the hub shaft 13 by meshing with the external spline 18 on the outer peripheral surface of the small-diameter shaft portion 16 of the hub shaft 13 and the internal spline 25 of the inner peripheral surface of the inner ring 21 in advance. Fit as possible.
Here, first, the shaft portion 72 of the connecting bolt 70 protruding from the end surface of the side wall portion 61 of the outer ring 60 of the constant velocity joint 50 is connected to one end side (vehicle width direction center side) of the inner hole 14 of the hub shaft 13 of the hub wheel 10. To the other end side (the vehicle width direction outer side).
Thereafter, the male screw portion 73 at the tip of the shaft portion 72 of the connecting bolt 70 is engaged with the side face spline 26 of the inner ring 21 of the hub shaft 13 and the side face spline 62 of the end surface of the outer ring 60 of the constant velocity joint 50. A tightening nut 75 is tightened to the male screw portion 65 in a state of protruding to the other end side of the inner hole 14 of the hub shaft 13. Here, a part of the thin portion 76 at the end of the tightening nut 75 is caulked in the caulking groove 74 of the male screw portion 73 and is prevented from rotating, so that the hub wheel 10 and the constant velocity joint 50 can transmit torque. Connected together.

The wheel support device according to the first embodiment is configured as described above.
Accordingly, the torque of the drive shaft 51 during traveling of the vehicle is sequentially transmitted to the inner ring 52, the plurality of balls 53, and the outer ring 60 of the constant velocity joint 50, and the outer ring 60 is rotated in the same direction as the drive shaft 51.
The torque transmitted to the constant velocity joint 50 is transmitted to the inner ring 21 by meshing between the side face spline 62 of the outer ring 60 of the equivalent speed joint 50 and the side face spline 26 of the inner ring 21 on the hub wheel 10 side. And it transmits to the hub wheel 10 by meshing | engagement with the internal-tooth spline 25 of the inner ring | wheel 21, and the external-tooth spline 18 of the hub axle 13, and a wheel is rotationally driven.

As described above, by forming the side face spline 26 and the internal spline 25 on the end face of the inner ring 21 on the hub wheel 10 side, the caulking portion at the end of the hub shaft of the conventional hub wheel is eliminated, and the hub Torque can be satisfactorily transmitted between the hub shaft 13 of the wheel 10 and the outer ring 60 of the constant velocity joint 50.
In addition, unlike the conventional case, the wheel support device can be shortened in shaft length by eliminating the caulking portion at the end of the hub shaft, thereby reducing the weight.
Further, the side face spline 26 can be easily formed on the end face of the inner ring 21 in a single product state constituting the angular ball bearing 20 as the rolling bearing on the hub wheel 10 side, and the internal spline 25 can be easily formed on the inner peripheral surface by forging or the like. it can. Furthermore, after forming the splines 25 and 26, the quality assurance inspection can be easily performed in the state of the single inner ring 21, which is effective in reducing the cost.

The present invention is not limited to the first embodiment.
For example, in the first embodiment, the case where the connecting bolt 70 separate from the outer ring 60 is fixed to the through hole 63 of the side wall 61 of the outer ring 60 of the constant velocity joint 50 by press fitting is illustrated. The present invention can be implemented even when the connecting bolt integrally protrudes from the side wall portion 61 of this.
Further, as the rolling bearing on the hub wheel 10 side, in addition to the double row angular ball bearing 20, a double row tapered roller bearing can also be used.

It is a sectional side view which shows the wheel support apparatus which concerns on Example 1 of this invention. Similarly, FIG. 2 is an enlarged side sectional view showing the meshing portion of both side face splines of the inner ring of the rolling bearing of the hub shaft and the outer ring of the constant velocity joint. It is a sectional side view which shows the conventional wheel support apparatus.

Explanation of symbols

10 Hub Wheel 11 Flange 13 Hub Shaft 18 External Spline 20 Angular Contact Ball Bearing (Rolling Bearing)
21 Inner ring 25 Internal spline 26 Side face spline 50 Constant velocity joint 60 Outer ring 61 Side wall 62 Side face spline 70 Connection bolt 75 Tightening nut

Claims (1)

A wheel support device in which a rolling bearing is provided on an outer peripheral surface of a hub shaft of a hub wheel to which a wheel is attached, and the hub shaft and an outer ring of a constant velocity joint are connected so as to be able to transmit torque,
Both end face splines that mesh with each other are formed on the end face of the inner ring of the rolling bearing and the end face of the end wall of the outer ring of the constant velocity joint that is abutted against the end face.
The wheel support device is characterized in that an external spline and an internal spline are formed on the outer peripheral surface of the hub shaft and the inner peripheral surface of the inner ring of the rolling bearing, respectively.

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