JP2001233011A - Wheel bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device capable of suppressing occurrence of a brake judder. SOLUTION: An rolling element 31 is assembled between double row rolling surfaces 3 provided on the inner periphery of an outward member 1 and double row rolling surfaces 16, 20 provided on the outer periphery of the inward member 11, and a wheel mounting flange 15 is provided on the outer periphery of the inward member 11. The wheel mounting flange 15 is elastically deformed in the mounted condition where the wheel mounting flange 15 is inclined outward, a brake rotor 40 and the wheel cover 41 of a wheel abuts on the wheel mounting flange 15, and are fastened by a hub bolt 18 and a wheel nut 19, in order to stabilize the mounting of the brake rotor 40. In addition, the surface run-out width of the brake rotor mounting surface 15a of the wheel mounting flange 15 at the time of its rotation is regulated within a regulated value, the surface run-out width of a braking surface 40a is kept down to a small one, and thereby, occurrence of a brake judder is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing device for supporting a vehicle wheel.

[0002]

2. Description of the Related Art There are two types of wheel bearing devices for automobiles, one for driving wheels for supporting driving wheels and the other for non-driving wheels for supporting non-driving wheels. There are various types of wheel bearing devices.

FIG. 8 shows an example. This wheel bearing device is for a drive wheel, and comprises an outer member 1, an inner member 11, and double rows of rolling elements 31 incorporated between the two members 1, 11.

[0004] A double row of rolling surfaces 3 are formed on the inner periphery of the outer member 1, and a flange 2 for attachment to a vehicle body is provided on the outer periphery.

[0005] The inner member 11 comprises a hub wheel 12 and a track member 1.
3, a wheel mounting flange 15 is provided on the outer periphery of one end of the hub wheel 12, a small diameter portion 12b is formed on the other end, and a track member 13 is fitted to the small diameter portion 12b.

[0006] Further, rolling surfaces 16 and 20 are formed on the outer periphery of each of the hub wheel 12 and the track member 13, and the rolling surfaces 1 and 20 are formed.
Between the rolling surfaces 6 and 20 and the rolling surface 3 of the outer member 1
1 is incorporated.

In order to apply a preload to the rolling element 31, a spline shaft 14c provided on the outer joint member 14 of the constant velocity universal joint is fitted into a spline hole 17 formed in the hub wheel 12, and the spline shaft 14c The nut 21 is screw-engaged with a screw shaft 14d provided at the tip of the nut.

The wheel bearing device is supplied from a wheel bearing manufacturer to an automobile assembly plant of an automobile manufacturer. In an automobile assembly factory, a separately supplied brake rotor 40 is fixed to the side surface 15a of the wheel mounting flange 15 of the wheel bearing device by tightening a bolt 42.

By the way, after assembly, the brake rotor 4
If the zero braking surface 40a has a large surface run-out, the frictional force will not be constant, and vibration or abnormal noise, that is, so-called brake judder will occur during braking.

[0010]

By the way, in order to suppress the vibration and abnormal noise generated due to the runout of the braking surface 40a of the brake rotor 40, conventionally, the processing accuracy of the parts is increased. Processing is troublesome, and processing errors of parts are accumulated by assembling the wheel bearing device. Therefore, it is impossible to suppress the runout of the braking surface 40a of the brake rotor 40.

In an automobile assembly plant, a wheel mounting flange 15 of a wheel bearing device supplied from a wheel bearing manufacturer is provided.
In addition, when the brake rotor 40 delivered as a separate part is assembled, adjustments such as phase adjustment of the surface runout of the wheel bearing flange 15 and the side runout of the side surface 40a of the brake rotor 40 are performed. Troublesome and poor workability.

An object of the present invention is to provide a wheel bearing device capable of suppressing surface runout of a brake rotor and minimizing occurrence of brake judder.

[0013]

In order to solve the above-mentioned problems, according to the present invention, there is provided an outer member having a double-row rolling surface on an inner periphery thereof, and a rolling member opposed to each of the rolling surfaces. A wheel mounting flange provided on one of the outer member and the inner member, comprising: an inner member having a surface on an outer periphery; and a double row of rolling elements incorporated between opposed rolling surfaces. In a wheel bearing device in which the outer side surface of a mounting flange has a brake rotor mounting surface, the wheel mounting flange is inclined toward the outer side, and the surface runout width of the brake mounting surface of the wheel mounting flange is restricted to a standard value. That is why the configuration was adopted.

Here, the outer side means outward in the width direction of the vehicle body when the wheel bearing device is mounted on the vehicle body.

As described above, by inclining the wheel mounting flange toward the outer side, the brake rotor is abutted against the brake rotor mounting surface of the wheel mounting flange, and the wheel of the wheel is superimposed on the brake rotor, and the hub bolt and When the brake rotor and the wheel are fastened by tightening the wheel nut that is screw-engaged with the brake rotor, the wheel mounting flange is elastically deformed, and the outer peripheral portion of the brake rotor mounting surface strongly contacts the brake rotor. For this reason, the brake rotor is stably supported on the outer peripheral portion of the abutting surface with respect to the brake rotor mounting surface, and together with the fact that the surface runout of the brake rotor mounting surface is restricted to within the standard value, the brake rotor is mounted. Surface runout of the braking surface during rotation can be suppressed.

Here, if the inclination angle of the wheel mounting flange becomes unnecessarily large, the amount of elastic deformation of the wheel mounting flange when the wheel nut is tightened with the specified torque to fix the brake rotor and the wheel becomes small, and the inner diameter of the brake rotor becomes smaller. The periphery cannot contact the brake rotor mounting surface of the wheel mounting flange. In this case, the mounting of the brake rotor becomes unstable, and it is not possible to suppress the runout of the braking surface of the brake rotor. For this reason, the inclination angle of the wheel mounting flange is preferably set to 20 'or less. Further, when the runout of the brake rotor mounting surface of the wheel mounting flange exceeds 30 μm, the runout during rotation of the brake rotor becomes large, and there is a possibility of generating brake judder. Therefore, the standard value is set to 30 μm or less. Is good.

In the wheel bearing device according to the present invention, when the flatness and the circumferential flatness of the outer peripheral portion of the brake rotor mounting surface of the wheel mounting flange are set to 30 μm or less, the run-out of the braking surface of the brake rotor can be further reduced. Can be.

Here, as shown in FIG. 7 (I), the circumferential flatness means that a measuring instrument A such as a dial gauge is brought into contact with an outer peripheral portion of a brake rotor mounting surface 15a of a wheel mounting flange 15, and The undulation component in the circumferential direction is measured by rotating the mounting flange 15, and the undulation component at the measured position is shown in FIG.
As shown in (II), when a plane is developed and sandwiched by two parallel straight lines (a) and (b), the distance δ is the minimum dimension.

The wheel bearing device according to the present invention may be for driving wheels or non-driving wheels. The wheel bearing device may be one in which a brake rotor is mounted on a wheel mounting flange. By setting the surface runout width of the braking surface of the brake rotor to 50 μm or less, favorable results can be obtained by suppressing brake judder.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment, and shows a wheel bearing device for a drive wheel. This wheel bearing device includes an outer member 1, an inner member 11, and a rolling element 31 incorporated between the two members.

The outer member 1 is provided with a mounting flange 2 for the vehicle body on the outer periphery and a double row of rolling surfaces 3 on the inner periphery.

The inner member 11 includes a hub wheel 12 and the track member 1.
3 and an outer joint member 14 of a constant velocity universal joint. The hub wheel 12 has a wheel pilot 12a at one end and a small diameter portion 12b at the other end. A wheel mounting flange 1 for mounting a wheel on the outer periphery of the hub wheel 12.
5 and a single row of rolling surfaces 16 are provided. further,
A spline hole 17 is formed in the hub wheel 12.

A hub bolt 18 is mounted on the wheel mounting flange 15. As shown in FIG. 2, a wheel nut 19 is screw-engaged with the hub bolt 18. By tightening the wheel nut 19, the brake rotor 40 and the wheel 41 of the wheel are mounted on the mounting surface 15a formed on the outer side of the wheel mounting flange 15.

The track member 13 has a rolling surface 20 on the outer periphery. The track member 13 is fitted to the small-diameter portion 12b formed on the hub wheel 12, and between the rolling surface 20 formed on the outer periphery and one rolling surface 3 of the outer member 1 and the other of the outer member 1. Rolling surface 3 and rolling surface 16 formed on the outer periphery of hub wheel 12
The rolling element 31 is incorporated between them.

The outer joint member 14 of the constant velocity universal joint has a circular pressing portion 14b for pressing the end surface of the track member 13 at the closed end of the cup portion 14a, and a spline shaft 14c is formed on the end surface of the pressing portion 14b. ing. A screw bearing 14d is provided at the tip of the spline shaft 14c.

The spline shaft 14c is fitted into the spline hole 17 of the hub wheel 12, and the outer joint member 14 and the hub wheel 12 are fastened by tightening the nut 21 which is screwed to the screw shaft 14d at the tip. 12 and track member 1
3 is pressed in the axial direction, and a preload is applied between the rolling element 31 and the rolling surfaces 3, 16, and 20 by the pressing.

In the wheel bearing device shown in FIG. 1, the wheel mounting flange 15 formed on the hub wheel 12 is inclined so as to be inclined toward the outer side, and the wheel runout of the wheel mounting flange 15 when the brake rotor mounting surface 15a rotates. The width is regulated within a standard value, and the standard value is set to 30 μm or less. Here, the outer side refers to the outer side in the width direction of the vehicle body when the wheel bearing device is assembled to the vehicle body.

As described above, by inclining the wheel mounting flange 15 toward the outer side, one side of the brake rotor 40 abuts against the mounting surface 15a of the wheel mounting flange 15 as shown in FIG. Rotor 40
When a wheel 41 of the wheel is abutted against the other side surface and the wheel nut 19 is tightened to a specified torque, the wheel mounting flange 1
5 is elastically deformed, and the outer peripheral portion of the brake rotor mounting surface 15 a strongly contacts one side surface of the brake rotor 40. Therefore, the brake rotor 40 is mounted on the brake rotor mounting surface 15.
a. The outer peripheral portion of the abutting surface against the a.a is stably supported, and the runout width during rotation of the brake rotor mounting surface 15a to which the brake rotor 40 is mounted is regulated within the standard value of 30 μm or less. In addition, the run-out of the braking surface 40a during rotation of the brake rotor 40 can be reduced, and the occurrence of brake judder can be suppressed.

Here, the inclination angle θ of the wheel mounting flange 15
Is larger than necessary, the wheel nut 19 is tightened to the specified torque, and the brake rotor 40 and the wheel 41 are tightened.
Is fixed, the amount of elastic deformation of the wheel mounting flange 15 is small, and the entire brake rotor mounting surface 15a of the wheel mounting flange 15 cannot be brought into close contact with one side surface of the brake rotor 40. As a result, the surface of the braking surface 40a of the brake rotor 40 during rotation cannot be suppressed. Therefore, the inclination angle θ of the wheel mounting flange 15 is preferably equal to or less than 20 ′.

If the flatness and the circumferential flatness of the outer peripheral portion of the brake rotor mounting surface 15a of the wheel mounting flange 15 exceed 30 μm, the runout of the braking surface 40a increases when the brake rotor 40 rotates, and the brake judder Cannot be suppressed. Therefore, the flatness and the circumferential flatness of the outer peripheral portion of the brake rotor mounting surface 15a are preferably set to 30 μm or less.

In order to reduce the runout width of the braking surface 40a of the brake rotor 40, the flatness and circumferential flatness of the abutment surface of the brake rotor 40 with respect to the wheel mounting flange 15 are set to 30 μm or less. The surface runout width of the surface 40a is set to 50 μm or less. In this manner, the brake rotor mounting surface 15a of the wheel mounting flange 15, the abutment surface of the brake rotor 40 against the wheel mounting flange 15, and the braking surface 40a of the brake rotor 40
By controlling the surface runout width within the standard value, the occurrence of brake judder can be almost completely prevented.

In the first embodiment, a nut 21 is screw-engaged with a screw shaft 14d provided on the outer joint member 14, and the hub wheel 12 and the track member 13 are axially moved by tightening the nut 21. Press the rolling element 31 and the rolling surface 3,
The preload is applied between the 16 and 20.
2 is extended in the axial direction, and the end protruding outward from the end face of the track member 13 is swaged,
The hub wheel 12, the track member 13 and the shaft are not separated, and
A preload may be applied between the rolling element and the rolling surface.

3 to 6 show other examples of the wheel bearing device according to the present invention.

FIG. 3 shows a second embodiment, which shows a wheel bearing device for driving wheels. This wheel bearing device is different from the wheel bearing device shown in FIG. 1 only in the configuration of the inner member 11.
For this reason, the same components are denoted by the same reference numerals and description thereof will be omitted.

The inner member 11 comprises a hub wheel 51 and an outer joint member 52 of a constant velocity universal joint. A wheel mounting flange 53 and a rolling surface 54 are formed on the outer periphery of the hub wheel 51. The hub wheel 51 is provided with a spline hole 55.

The outer joint member 52 has a spline shaft 52b at the closed end of the mouth portion 52a, and a rolling surface 56 is formed on the outer peripheral surface of the shoulder portion 52c of the mouth portion 52a. The spline shaft 52b is fitted in a spline hole 55 of the hub wheel 51.

Between the rolling surface 54 formed on the hub wheel 51 and one rolling surface 3 of the outer member 1, and between the rolling surface 56 formed on the outer joint member 52 and the other rolling of the outer member 1. The rolling element 31 is incorporated between the surfaces 3, and a preload is applied between the rolling element 31 and the rolling surfaces 3, 54, 56 by caulking the end of the spline shaft 52 b. In addition, the hub wheel 51 and the outer joint member 52 are not separated in the axial direction by the caulking. Reference numeral 57 denotes a caulking portion.

Also in the above embodiment, the wheel mounting flange 53 formed on the hub wheel 51 is inclined toward the outer side, and the inclination angle θ is set to 20 ′ or less.
In addition, the runout of the brake rotor mounting surface 53a of the wheel mounting flange 53 is regulated within a standard value of 30 μm or less,
The flatness and circumferential flatness of the outer peripheral portion are set to 30 μm or less. The flatness and circumferential flatness of the abutment surface of the brake rotor 40 mounted on the wheel mounting flange 53 are 3
0 μm or less, and the runout width of the braking surface of the brake rotor 40 is within a standard value of 50 μm or less.

FIG. 4 shows a third embodiment, which shows a wheel bearing device for driving wheels. In this embodiment and the wheel bearing device shown in FIG. 3, a bearing portion 58 having a larger diameter than the spline shaft 52 b is formed at the base of the spline shaft 52 b of the joint member 52 outside the constant velocity universal joint. Bearing part 5
8 in that a rolling surface 60 is provided on the outer periphery of a raceway member 59 press-fitted to the wheel 8, and the wheel mounting flange 53 formed on the hub wheel 51 is inclined to the outer side by 20 ′ or less,
The brake rotor mounting surface 5 of the wheel mounting flange 53
It is the same that the surface runout of 3a is regulated within a standard value of 30 μm or less, and the flatness and circumferential flatness are regulated to 30 μm or less.

Also in the above embodiment, the flatness and circumferential flatness of the abutment surface of the brake rotor 40 mounted on the wheel mounting flange 53 are restricted to 30 μm or less, and the runout of the braking surface of the brake rotor 40 is controlled. 50 μm width
It is within the following standard values.

FIG. 5 shows a fourth embodiment, and shows a wheel bearing device for a non-driving wheel. This wheel bearing device is different from the wheel bearing device shown in FIG. 1 only in the inner member 11. The inner member 11 includes a wheel mounting flange 62 and a single row of rolling surfaces 6.
3 comprises an axle 61 having an outer periphery 3 and a track member 64 having a single row of rolling surfaces 65 on the outer periphery.

A small diameter shaft portion 61a is formed at the end of the axle 61, and a track member 64 is press-fitted into the small diameter shaft portion 61a. A screw shaft 61b is formed at the tip of the small-diameter shaft portion 61a, and the nut 66 engaged with the screw shaft 61b is screwed.
The axle 61 and the track member 64 are maintained in an assembled state by the tightening of the rolling element 31 and the rolling surfaces 3, 63, 6
A preload is applied between five.

Also in the fourth embodiment, the axle 6
The wheel mounting flange 62 provided at 1 is inclined so as to incline toward the outer side, and the inclination angle θ is within 20 ′. The runout of the brake rotor mounting surface 62a of the wheel mounting flange 62 is regulated within a standard value of 30 μm or less, and the flatness and circumferential flatness of the outer peripheral portion are set to 30 μm or less. The flatness and circumferential flatness of the abutment surface of the brake rotor 40 mounted on the wheel mounting flange 62 with respect to the wheel mounting flange 62 are also set to 30 μm or less. Further, in a mounting state in which the brake rotor 40 and a wheel (not shown) of the wheel are fastened to the wheel mounting flange 62, the runout width of the braking surface 40a of the brake rotor 40 is specified to be 50 μm or less.

FIG. 6 shows a fifth embodiment, showing a wheel bearing device for non-driving wheels. This wheel bearing device includes a pair of track members 71 mounted on an axle inside an outer member 70.
a and 71b are incorporated, and the rolling elements 31 are incorporated between a rolling surface 72 formed on the outer periphery of each of the track members 71a and 71b and a double row of rolling surfaces 73 provided on the inner periphery of the outer member 70. The outer member 70 is rotatably supported.

A wheel mounting flange 74 is formed on the outer periphery of the outer member 70, and the wheel mounting flange 74 is provided with a brake rotor 40 and a hub bolt 75 for mounting the wheel.

Also in the above embodiment, the wheel mounting flange 74 is inclined toward the outer side, and the inclination angle θ is set to 2
It is within 0 '. Further, the runout of the brake rotor mounting surface 74a of the wheel mounting flange 74 is regulated within a standard value of 30 μm or less, and the flatness and circumferential flatness of the outer peripheral portion are set to 30 μm or less. The flatness and circumferential flatness of the abutment surface of the rotor 40 with respect to the wheel mounting flange 74 are set to 30 μm or less. Further, in a mounting state in which the brake rotor 40 and the wheels of the wheels not shown are fastened to the wheel mounting flange 74, the braking surface 40 of the brake rotor 40 is
The surface runout width a is specified to be 50 μm or less.

[0047]

As described above, in the wheel bearing device according to the present invention, the brake rotor and the wheel mounting flange on which the wheel is mounted are inclined toward the outer side, so that the brake rotor abuts on the wheel mounting flange. By superimposing the wheel on the wheel and tightening the nut screw-engaged with the hub bolt with the specified torque, the wheel mounting flange is elastically deformed and the outer periphery strongly touches the side surface of the brake rotor, making the brake rotor extremely stable. The brake rotor can be mounted well, and the runout width of the brake rotor mounting surface of the wheel mounting flange is regulated within the standard value, so that the runout width of the brake surface of the brake rotor can be reduced.

Further, by regulating the flatness of the brake rotor mounting surface of the wheel mounting flange within the standard value, it is possible to suppress the surface runout width of the braking surface of the brake rotor to a low value, thereby suppressing the occurrence of brake judder. can do.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of a wheel bearing device according to the present invention.

2 is a longitudinal sectional front view showing a state where a brake rotor and a wheel are mounted on a brake rotor mounting surface of the wheel bearing device shown in FIG. 1;

FIG. 3 is a longitudinal sectional front view showing a second embodiment of the wheel bearing device according to the present invention;

FIG. 4 is a longitudinal sectional front view showing a third embodiment of the wheel bearing device according to the present invention;

FIG. 5 is a longitudinal sectional front view showing a fourth embodiment of the wheel bearing device according to the present invention;

FIG. 6 is a longitudinal sectional front view showing a fifth embodiment of the wheel bearing device according to the present invention.

FIG. 7 (I) is a perspective view showing a measurement state of a circumferential flatness of a wheel mounting flange, and FIG. 7 (II) is an explanatory view in a case where the circumferential flatness is measured from the measurement result.

FIG. 8 is a longitudinal sectional front view showing a conventional wheel bearing device.

[Explanation of symbols]

 Reference Signs List 1 outer member 3 rolling surface 11 inner member 12 hub wheel 12b small diameter portion 13 track member 15 wheel mounting flange 15a brake rotor mounting surface 16 rolling surface 20 rolling surface 31 rolling element 40 brake rotor 40a braking surface 51 hub wheel 52 Outer joint member 52b Spline shaft 53 Wheel mounting flange 54 Rolling surface 55 Spline hole 56 Rolling surface 58 Bearing portion 59 Track member 62 Wheel mounting flange 62a Brake rotor mounting surface 70 Outer members 71a, 71b Track member 72 Rolling surface 73 Rolling surface 74 Wheel mounting flange 74a Brake rotor mounting surface

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akira Torii 1578 Higashikaizuka, Iwata-shi, Shizuoka F-term (reference) 3N058 AA43 AA53 BA51 CB17 CB30 CD38 FA01

Claims (13)

[Claims] 1. An outer member having a plurality of rows of rolling surfaces on an inner periphery, an inner member having a rolling surface opposed to each of the rolling surfaces on an outer periphery, and an inner member embedded between the opposed rolling surfaces. A wheel bearing device comprising a double row rolling element, a wheel mounting flange provided on one of the outer member and the inner member, and an outer side surface of the wheel mounting flange being a mounting surface of a brake rotor. The wheel bearing device according to any one of claims 1 to 3, wherein the wheel mounting flange is inclined toward an outer side, and a runout width of the wheel mounting flange at the time of rotation of a brake rotor mounting surface is regulated within a standard value. 2. The inclination angle of the wheel mounting flange is 20 '.
The wheel bearing device according to claim 1, wherein: 3. The wheel bearing device according to claim 1, wherein the standard value is 30 μm or less. 4. The wheel bearing device according to claim 1, wherein a flatness of an outer peripheral portion of the wheel mounting flange on a brake rotor mounting surface is set to 30 μm or less. 5. The wheel bearing device according to claim 1, wherein a circumferential flatness of an outer peripheral portion of the wheel mounting flange on a brake rotor mounting surface is 30 μm or less. 6. The wheel bearing device according to claim 1, wherein the wheel mounting flange is provided on an inner member. 7. The inner member has a wheel mounting flange, and is press-fitted into a hub wheel having one rolling surface formed directly on the outer periphery and a small-diameter portion formed at an end of the hub wheel. 2. A track member having another rolling surface formed on an outer periphery thereof.
The wheel bearing device according to any one of claims 1 to 6. 8. The hub member in which the inner member has a wheel mounting flange and one rolling surface is formed directly on the outer periphery, and the other rolling surface is formed directly on the outer periphery of the shoulder. 7. An outer joint member of a speed universal joint, wherein a spline shaft provided in the outer joint member is fitted into a spline hole formed in a hub wheel to connect the hub wheel and the outer joint member. The wheel bearing device according to any one of the above. 9. A hub wheel in which the inner member has a wheel mounting flange and one rolling surface is directly formed on the outer periphery, and a track member having the other rolling surface formed directly on the outer periphery; An outer joint member of a constant velocity universal joint having a bearing portion into which the raceway member is fitted, and a spline shaft formed at a tip of the bearing portion; and forming a spline shaft of the outer joint member on a hub wheel. The wheel bearing device according to any one of claims 1 to 6, wherein the hub wheel and the outer joint member are connected to each other by fitting into the formed spline hole. 10. The wheel bearing device according to claim 1, wherein the wheel mounting flange is provided on an outer member. 11. The wheel bearing device according to claim 1, wherein a brake rotor is mounted on the wheel mounting flange. 12. The wheel bearing device according to claim 11, wherein a runout width of the brake surface of the brake rotor during rotation is regulated within a standard value. 13. The wheel bearing device according to claim 12, wherein a standard value of the surface runout width is set to 50 μm or less.