JP2001334803A - Bearing device for axle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for an axle which maintains the performance of a disc rotor and a wheel member only by the improvement of the precision of eccentricity of the part of the outside diameter rather than the bolt hole of a radial flange. SOLUTION: The bearing device for axle has an inner ring part, an outer ring part, a rolling element held by the holder among them, and a radial flange which is equipped in the side with the disc rotor for discbrake in the inner ring part or outer ring part of rolling part, has a plurality of bolt holes 7 in the axle direction on the circumference of the radial flange 6, and pushes and fixes the bolt 10 for fixing wheel 10 into each bolt hole 7, and forms the outside diameter part 13a like such shape as stairs slightly projecting to the disc rotor 8 side than the inside diameter part 13b including bolt hole 7 out of the inside diameter 13b out of the bolt hole 7 of the radial flange side 13 fitting the disc rotor 8. The outside part 13a of the radial flange ground and turned, and the disc rotor 8 is contacted on the side 13 of flange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an axle bearing device used for an automobile.

[0002]

2. Description of the Related Art Conventionally, for example, FIG.
No. 809) is known. That is, an outer ring member 30 attached to a vehicle body (not shown), an inner ring member 31 to which a disk rotor 37 of a disk brake device is attached, and an inner / outer ring member 3
And a rolling element 32 interposed between the first and the third holder 30 and held by the holders 33 and 34. An annular radial flange 35 is provided at one end of the outer periphery of the inner ring member 31 on the side to be a rotating member, and a plurality of axially penetrated through the radial flange 35 at circumferentially equal intervals and at the same radial position. A bolt hole 36 is formed.
Is inserted. Serrations 40 are formed in the neck lower portion 39a of the bolt 39 and bite into the inner peripheral surface of the bolt hole 36, whereby the bolt 39 is press-fitted and fixed in the bolt hole 36. Also, the radial flange 35
The disc rotor 37 and the wheel member 38 are fitted to the foot portions 39b of the bolts 39 projecting from the
A nut 41 is screwed into a screw portion 39c formed on the foot portion 39b, thereby fixing the disk rotor 37 and the wheel member 38. At this time, the disk rotor 37 is pressed and fixed to the side surface 43 of the radial flange 35.

[0003]

In the above axle bearing device, since the bolt 39 is press-fitted and fixed in the bolt hole 36, the disk rotor 3 of the radial flange 35 is fixed.
The area around the bolt hole 36 on the side surface 43 on the side where the mounting member 7 is mounted is likely to undulate, so that the surface runout accuracy of the flange side surface 43 tends to be affected. If the precision of the runout of the radial flange side surface 43 is reduced, the performance of the disk rotor 37 and the wheel member 38 is adversely affected. Therefore, in the conventional bearing device shown in FIG. 3, the groove 42 is formed around the bolt hole 36 of the radial flange 35 so that the undulation is kept inside the groove 42, so that the radial flange 35 adversely affects the disk rotor mounting side surface 43. To prevent this side 4
3 is maintained. However, the depth and size of the groove 42 are determined from various design conditions, but depending on the shape of the groove 42, the bolt 39
The influence at the time of press-fitting acts on the side surface 43,
Swell may occur.

In this case, the side surface 4 of the radial flange 35
3 is processed by a polishing process or a turning process to improve the run-out accuracy. However, since this processing is performed in a state where the bolt 39 is press-fitted and fixed to the radial flange 35, only the outer diameter side portion 43a from the groove can be formed. Therefore,
The outer diameter side portion 43a of the side surface 43 of the radial flange 35 has improved surface runout accuracy, but the inner diameter side portion 43b is in an unprocessed state, and the surface runout accuracy remains reduced. As a result, when the disk rotor 37 and the wheel member 38 are mounted on the side surface 43 of the radial flange 35, the disk rotor 37 and the wheel member 38 are affected by the inner diameter side portion 43 b including the bolt hole 36 having poor surface runout accuracy. It is thought that this may lead to performance degradation.

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems, and the performance of a disk rotor and a wheel member can be maintained only by improving the surface runout accuracy of a portion on an outer diameter side from a bolt hole of a radial flange. It is an object to provide a simple axle bearing device.

[0006]

As means for solving the above problems, there are provided an inner ring member, an outer ring member, a rolling element interposed and held by a retainer between the inner and outer ring members, and a side to be a rotating member. A radial flange formed on the inner ring member or the outer ring member and having a disk rotor of a disk brake device mounted on a side surface thereof, wherein a plurality of axial bolt holes are formed in the radial flange. At the same time, a wheel mounting bolt is press-fitted and fixed in each of the bolt holes, and a portion outside the bolt hole on the side of the radial flange on which the disk rotor is mounted is slightly closer to the disk rotor side than the inside diameter portion including the bolt hole. The outer part of the radial flange is ground or turned to abut the disk rotor on the side of the flange. Characterized in that it was.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the present invention will be described with reference to FIGS. An outer ring member 1 attached to a vehicle body (not shown), an inner ring member 2 to which a disk rotor 8 of a disk brake device is attached, and a rolling element 3 interposed between the inner and outer ring members 2 and 1 held by retainers 4 and 5. And sealing members 15 arranged at both ends of the outer ring member 1 to seal the inside of the bearing.

[0008] An annular radial flange 6 is provided at one end of the outer periphery of the inner ring member on the side to be a rotating member. A bolt hole 7 penetrating in the axial direction is formed, and a bolt 10 is inserted into the bolt hole 7.
A groove 14 is formed around the bolt hole 7.
The shape and operation of the groove 14 are the same as those of the conventional structure shown in FIG. Serration 1 on the lower part 10a of the bolt 10
1 is formed and bites into the inner peripheral surface of the bolt hole 7, whereby the bolt 10 is press-fitted and fixed in the bolt hole 7. Further, the disc rotor 8 and the wheel member 9 are fitted to the feet 10b of the bolts 10 protruding from the radial flange 6, and the nuts 12 are screwed into the screw parts 10c formed on the feet 10b of the bolts 10. To fix the disk rotor 8 and the wheel member 9. At this time, the disk rotor 8 is pressed and fixed to the side surface 13 of the radial flange 6.

As shown in FIG. 2, the side surface 13 of the radial flange 6 on which the disk rotor 8 is mounted has a portion 13 outside the bolt hole 7 on the outside diameter side including the portion at the position of the bolt hole 7. The portion 13b has a stepped shape slightly protruding h1 toward the disk rotor 8 side as compared with the portion 13b.

On the side surface 13 of the radial flange 6 on the disk rotor mounting side, a portion 13a on the outer diameter side of the bolt hole 7 is ground by grinding or turning in a state where the bolt 10 is fixed by press-fitting. The runout accuracy has been improved. It should be noted that, even when the above processing is completed, the outer diameter side portion 13a of the bolt hole 7 is at least the same as the inner diameter side portion 13b as compared with the inner diameter side portion 13b including the bolt hole position. It has a stepped shape slightly projecting h2 to the 8 side. As a result, the disk rotor 8 is fixed to the inner diameter side portion 13 of the bolt hole 7.
b and the outer diameter side portion 13a, or the abutment only at the outer diameter side portion 13a from the bolt hole 7 and the inner diameter side portion 13b including the unprocessed position of the bolt hole 7 Will be in slight contact or non-contact,
The disk rotor 8 follows the surface runout accuracy of the outer diameter side portion 13a.

In the embodiment of the present invention, an inner raceway is formed at the center of the outer peripheral surface of the axle, and an axle having a cylindrical step formed inside the axle is fitted to the inner cylindrical step of the axle. Although the axle bearing device including the inner ring and the outer ring having the body fixing flange formed on the outer peripheral surface has been described, the present invention is not limited to this. For example, an axle bearing device including an axle having an outer peripheral surface formed of a cylindrical step, a plurality of inner rings fitted to the outer peripheral surface, and an outer ring having a body fixing flange formed on the outer peripheral surface, A plurality of inner rings fitted and fixed to the
An axle bearing device consisting of an outer ring with an outer ring formed with a flange portion for mounting the wheel on the outer peripheral surface, and an outer ring of a constant velocity joint in which the portion on the side where the wheel is mounted is cylindrical and the inner ring raceway is formed in the center step The present invention is also applicable to an axle bearing device and the like comprising a member, an axle having an inner raceway formed at a central portion of an outer peripheral surface fitted with the outer peripheral surface of the cylindrical portion, and an outer ring having a vehicle body fixing flange formed on an outer peripheral surface. You can do it.

[0012]

According to the present invention, in an axle bearing device, a plurality of axial bolt holes are formed in a radial flange provided on a rotating member for mounting a disk rotor and a wheel member. Steps in which wheel mounting bolts are press-fitted and fixed in the respective bolt holes, and a portion on the radial flange side on which the disk rotor is mounted is slightly projecting toward the disk rotor side from the inner diameter side portion including the bolt holes. The outer portion of the radial flange is polished or turned so as not to be lower than the inner portion, and a disk rotor is brought into contact with a side surface of the flange. For this reason, since the disk rotor can be fixed along the outer diameter side portion from the bolt hole of the radial flange, the performance of the disk rotor and the wheel member can be maintained only by improving the surface runout accuracy of the outer diameter side portion. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a sectional view of an axle bearing device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view of a conventional axle bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring member 2 Inner ring member 3 Rolling element 4 Cage 5 Cage 6 Radial flange 7 Bolt hole 8 Disk rotor 9 Wheel member 10 Bolt 13 Side surface 13a Outside diameter side portion on side surface 13b Inside diameter side including bolt hole position portion on side surface part

Claims (2)

[Claims] An inner ring member, an outer ring member, a rolling element held by a retainer between the inner and outer ring members, and a disk brake formed on the inner ring member or the outer ring member on the side to be a rotating member. An axle bearing device having a radial flange on the side of which the disk rotor of the device is mounted,
A plurality of circumferential bolt holes are formed in the radial flange, and a wheel mounting bolt is press-fitted and fixed in each of the bolt holes, and the outer diameter is larger than the bolt hole on the side of the radial flange for mounting the disk rotor. The side portion is formed in a stepped shape slightly protruding toward the disk rotor side from the inner diameter side portion including the bolt hole, and the outer portion of the radial flange is polished or turned to abut the disk rotor on the side surface of the flange. A bearing device for an axle, characterized in that: 2. An inner ring, a shaft member fitted to the inner peripheral surface of the inner ring, an outer ring member, a rolling element held by a retainer between the inner ring and the outer ring member, and a rotating member. And a radial flange formed on the shaft member or the outer ring member on the side of the shaft, and having a radial flange on which a disk rotor of the disk brake device is mounted on a side surface. While forming
A wheel mounting bolt is press-fitted into each of the bolt holes, and a portion of the radial flange side on which the disk rotor is mounted is slightly projecting outward from the bolt hole toward the disk rotor side from the inner diameter portion including the bolt hole. A bearing device for an axle, wherein the disk rotor is formed in a shape with a groove, the outer portion of the radial flange is subjected to a grinding process or a turning process, and a disk rotor is brought into contact with a side surface of the flange.