JP2002019405A - Wheel bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel bearing device for restraining generation of a brake judder. SOLUTION: A thin film is interposed between a wheel installing flange 15 side brake rotor installing surface 15a and a brake rotor 40 side butting surface 40b for butting against this brake rotor installing surface 15a, and when installing a wheel by this thin film, a void being a deformation factor of a brake rotor 40 is filled up, and deformation of the brake rotor 40 is restrained, and the brake judder is easily and inexpensively prevented.

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. 10 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 at 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 members 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 delivered from a wheel bearing manufacturer to an automobile assembly plant of an automobile manufacturer. In an automobile assembly plant, the wheel mounting flange 1 of the wheel bearing device
A separately supplied brake rotor 40 is fixed to the side surface 15a by tightening bolts 42.

[0009]

However, if the braking surface 40a of the brake rotor 40 has a large runout after assembly, the frictional force will not be constant, and vibration and abnormal noise during braking, that is, so-called brake judder will occur. I do.

Conventionally, in order to suppress the vibration and abnormal noise caused by the runout of the braking surface 40a of the brake rotor 40, the processing accuracy of the component is conventionally increased. Processing takes time and costs increase.

Further, since the machining errors of the parts are accumulated by assembling the wheel bearing device, it is difficult to suppress the runout of the braking surface 40a of the brake rotor 40 even if the machining accuracy of each part is increased. is there.

Further, the brake rotor mounting surface 15a of the wheel mounting flange 15 and the abutment surface 40 on the brake rotor 40 side which abuts against the brake rotor mounting surface 15a.
As shown in the enlarged schematic diagram (a) of FIG. 11, b includes a swell component, and the combination of these swell components greatly affects the surface runout of the brake rotor 40.
Conventionally, in an automobile assembly plant, when assembling the wheel mounting flange 15 of the wheel bearing device delivered from a wheel bearing manufacturer and the brake rotor 40 delivered as a separate part,
Runout of Wheel Mounting Flange 15 and Brake Rotor 40
The phase adjustment is performed at the maximum and minimum positions of the surface deflection of the braking surface 40a, but such a method is extremely troublesome and the workability is poor.

When the brake rotor mounting surface 15a of the wheel mounting flange 15 and the abutment surface 40b of the brake rotor 40 which abut against this surface are abutted, a gap is formed between the two due to the waviness component. Formed so that the wheel mounting flange 15
When the brake rotor 40 and the brake rotor 40 are brought into pressure contact with each other, the brake rotor 40 is likely to be deformed, as shown by the one-dot chain line in the enlarged schematic diagram (b) of FIG.

The deformation of the brake rotor 40 that occurs when the wheel is assembled increases the deflection of the brake rotor 40 and causes brake judder.

SUMMARY OF THE INVENTION It is an object of the present invention to suppress the deformation of the brake rotor which occurs at the time of assembling the wheel, and to prevent the brake judder simply and inexpensively.

[0016]

In order to solve the above-mentioned problems, according to the present invention, there is provided an outer member having a plurality of rows of rolling surfaces 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 the mounting flange has a brake rotor mounting surface, a brake rotor mounting surface on the wheel mounting flange side and a brake rotor side abutting surface that abuts on the brake rotor mounting surface. A thin film was interposed between them (an enlarged schematic diagram shown in FIG. 4A). In FIG. 4, A indicates a thin film.

As described above, if a thin film is interposed between the brake rotor mounting surface of the wheel mounting flange and the surface of the brake rotor that comes into contact with the brake rotor mounting surface, when the wheel is assembled, the structure shown in FIG. As shown in b), the thin film fills a gap that causes deformation of the brake rotor, so that deformation of the brake rotor is suppressed.

The thin film is formed of a material softer than steel. However, a material that is too soft such as rubber is not preferable because the required rigidity of the brake rotor and the wheel is impaired. As a method of forming the thin film, for example, an age-hardening resin sheet or a coating film containing an age-hardening resin as a main component is applied to a brake that abuts a brake rotor mounting surface on a wheel mounting flange side or a wheel mounting flange. A method of bonding or applying to the abutting surface on the rotor side can be adopted.

The preferable thickness of the thin film for filling the gap, which causes the deformation of the brake rotor, is 5 to 200 μm.

The thin film may be provided on only one of the brake rotor mounting surface on the wheel mounting flange side and the brake rotor side abutting surface which abuts on the brake rotor mounting surface, or may be provided on both surfaces. You may.

By using an age-hardening resin sheet or a coating mainly composed of an age-hardening resin as the material of the thin film, the mounting rigidity of the brake rotor after mounting the wheel can be secured. .

Further, by using a thermosetting resin as a material for the thin film and providing a simple heating step on an assembly line, the mounting rigidity of the brake rotor after mounting the wheel can be ensured.

Further, the effect of suppressing the deformation of the brake rotor can be further enhanced by inclining the wheel mounting flange toward the outer side at an angle of 20 minutes 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.

That is, by inclining as described above, the brake rotor abuts against the brake rotor mounting surface of the wheel mounting flange, the wheel of the wheel is superimposed on the brake rotor, and a hub bolt and a wheel nut screw-engaged with the hub bolt. When the brake rotor and the wheel are fastened by tightening, 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 at the outer peripheral portion of the abutment surface with respect to the brake rotor mounting surface, so that the runout of the braking surface during rotation of the brake rotor 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 is small, and the inner diameter of the brake rotor is small. 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 minutes or less.

If the run-out of the brake rotor mounting surface of the wheel mounting flange exceeds 30 μm, the run-out of the brake rotor during rotation increases, which may cause brake judder. The runout of the mounting surface is preferably 30 μm or less.

The runout of the brake rotor mounting surface of the wheel mounting flange can be reduced by setting the flatness of the outer peripheral portion and the circumferential flatness of the brake rotor mounting surface of the wheel mounting flange to 30 μm or less. The run-out can be kept smaller.

Here, the flatness in the circumferential direction refers to the flatness in FIG.
As shown by, a measuring instrument B such as a dial gauge is brought into contact with the outer peripheral portion of the brake rotor mounting surface of the wheel mounting flange, and the wheel mounting flange is rotated to measure a circumferential waviness component. Figure 9 (I
As shown in I), this is the size of a dimension that minimizes the interval δ when it is developed in a plane and sandwiched between two parallel straight lines (a) and (b).

The wheel bearing device according to the present invention may be used for either driven wheels or non-driven wheels. Further, 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.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment, which shows a wheel bearing device for driving wheels. The wheel bearing device includes an outer member 1, an inner member 11, and a rolling element 3 incorporated between the two members.
Consists of one.

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

The inner member 11 includes the 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. On the outer periphery of the hub wheel 12, a wheel mounting flange 15 for mounting a wheel 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.
As shown in FIG. 7, the wheel nut 19 is screwed.
By tightening the wheel nut 19, the brake rotor 40 and the wheel 4 of the wheel are mounted on the brake rotor mounting surface 15a formed on the outer side of the wheel mounting flange 15.
1 is attached.

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 face 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 shaft 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 end. 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 brake rotor mounting surface 15 on the wheel mounting flange 15 side is used.
A thin film is interposed between a and the abutting surface 40b of the brake rotor 40 which abuts on the brake rotor mounting surface 15a.

The thin film is provided on the brake rotor mounting surface 15a on the wheel mounting flange 15 side and on the abutment surface 4 of the brake rotor 40 which abuts against the brake rotor mounting surface 15a.
0b may be provided on only one side or on both sides.

The thin film is formed of a material softer than steel. For example, an age-hardening resin sheet or a coating film containing an age-hardening resin as a main component is applied to the brake rotor mounting surface 15 a of the wheel mounting flange 15, Alternatively, it is formed by a method of bonding or applying to the abutting surface 40b of the brake rotor 40.

Further, by using an age-curable resin sheet or a coating film containing an age-curable resin as a main component as a material of the thin film, it is possible to obtain
The mounting rigidity of the brake rotor can also be secured. Specific examples of the age hardening resin include Loctite (trade name) “anaerobic acrylic adhesive” or PC
L1B (trade name) “acrylic / enamel paint (ferrocoat paint)” is available.

The brake rotor mounting surface 15 of the wheel mounting flange 15 which causes the deformation of the brake rotor 40
The upper limit of the thickness of the thin film required to fill the gap between a and the abutment surface 40b of the brake rotor 40 that abuts on the brake rotor mounting surface 15a is 200 μm.
The lower limit thickness of the thin film is determined by the brake rotor mounting surface 15.
The thickness is set to 5 μm from the surface roughness of “a”.

Further, by using a thermosetting resin as a material of the thin film and providing a simple heating step on the assembly line, the mounting rigidity of the brake rotor 40 after mounting the wheel can be ensured. . As a specific example of the thermosetting resin, bakelite (phenol resin) can be used.

The wheel mounting flange 15 formed on the hub wheel 12 is inclined toward the outer side, and the brake rotor mounting surface 15a of the wheel mounting flange 15 is provided.
Is regulated within a standard value during rotation, 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 to the outer side, one side of the brake rotor 40 abuts against the brake rotor mounting surface 15a of the wheel mounting flange 15, as shown in FIG. When the wheel 41 of the wheel is abutted against the other side surface of the brake rotor 40 and the wheel nut 19 is tightened with a specified torque, the wheel mounting flange 15 is elastically deformed, and the outer peripheral portion of the brake rotor mounting surface 15a is Hit one side strongly. For this reason, the brake rotor 40 is stably supported on the outer peripheral portion of the abutting surface with respect to the brake rotor mounting surface 15a, and the runout width of the brake rotor mounting surface 15a to which the brake rotor 40 is mounted during rotation is 30 μm. It is regulated within the following standard values, and the brake rotor mounting surface 15a and the brake rotor 4
In addition to the deformation suppressing action of the brake rotor 40 due to the thin film interposed between the brake abutment surface 40b and the zero abutment surface 40b, the runout of the brake surface 40a during rotation of the brake rotor 40 can be suppressed to be small, and the brake judder Generation can be suppressed more effectively.

Here, when the inclination angle θ of the wheel mounting flange 15 is larger than necessary, the wheel nut 19 is tightened to a specified torque to thereby brake the rotor 40 and the wheel 4.
1, 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. Becomes unstable, causing the brake rotor 40 to rotate.
Of the braking surface 40a cannot be suppressed. Therefore, the inclination angle θ of the wheel mounting flange 15 is preferably equal to or less than 20 minutes.

If the flatness of the outer peripheral portion and the circumferential flatness of the brake rotor mounting surface 15a of the wheel mounting flange 15 exceeds 30 μm, the runout of the braking surface 40a during rotation of the brake rotor 40 increases, and The occurrence of 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 the 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.
Of the braking surface 40a is set to 50 μm or less.
As described above, the brake runner mounting surface 15 a of the wheel mounting flange 15, the abutment surface of the brake rotor 40 against the wheel mounting flange 15, and the surface runout width of the braking surface 40 a of the brake rotor 40 are managed within the standard values, so that the brake is provided. The occurrence of 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.

FIGS. 5 to 8 show other examples of the wheel bearing device according to the present invention.

FIG. 5 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.

The rolling surface 54 formed on the hub wheel 51 and one rolling surface 3 of the outer member 1 and 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. Further, the hub wheel 51 and the outer joint member 52 are not separated in the axial direction by the above-described crimping. Reference numeral 57 denotes a caulking portion.

Also in the above embodiment, a thin film is interposed between the brake rotor mounting surface 53a of the wheel mounting flange 53 and the abutment surface 40b of the brake rotor 40 which abuts against the brake rotor mounting surface 53a. I have.
Further, a wheel mounting flange 53 formed on the hub wheel 51 is provided.
Is inclined to the outer side, and the inclination angle θ is 20
Minutes or less. The run-out of the brake rotor mounting surface 53a of the wheel mounting flange 53 is regulated within a standard value of 30 μm or less, and the flatness of the outer peripheral portion and the circumferential flatness 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 30 μm or less,
The runout width of the braking surface of the brake rotor 40 is 50 μm.
It is within the following standard values.

FIG. 6 shows a third embodiment, which shows a wheel bearing device for driving wheels. This embodiment and the wheel bearing device shown in FIG.
A bearing 58 having a larger diameter than the spline shaft 52b is formed at the base of the second spline shaft 52b.
The wheel mounting flange 53 formed on the hub wheel 51 is inclined toward the outer side at an angle of 20 minutes or less, and the rolling surface 60 is provided on the outer periphery of the raceway member 59 press-fitted into the wheel. The same is true in that the run-out of the brake rotor mounting surface 53a of the mounting flange 53 is restricted to a standard value of 30 μm or less, and the flatness and the flatness in the circumferential direction are restricted to 30 μm or less.

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

FIG. 7 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 an axle 61 having a wheel mounting flange 62 and a single row of rolling surfaces 63 on the outer periphery, 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.

In the fourth embodiment as well, the brake rotor mounting surface 62a of the wheel mounting flange 62,
A thin film is interposed between the abutting surfaces 40b of the brake rotor 40 that abut against the brake rotor mounting surface 62a. The wheel mounting flange 62 provided on the axle 61 is inclined so as to incline toward the outer side, and the inclination angle θ is set within 20 minutes. The wheel mounting flange 6
The runout of the brake rotor mounting surface 62a of No. 2 is 30 μm.
The flatness of the outer peripheral portion and the flatness in the circumferential direction are regulated to 30 μm or less. The 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 and the flatness in the circumferential direction 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.

In the fourth embodiment shown in FIG.
A nut 66 is screw-engaged with a screw shaft 61b provided at the tip of the small diameter shaft portion 61a, and the axle 61 and the track member 64 are pressed in the axial direction by tightening the nut 66 to roll with the rolling element 31. The preload is applied between the surfaces 3, 63 and 65, but the small diameter shaft portion 61a of the axle 61 is extended in the axial direction, and the end of the track member 64 projecting outward from the end surface is caulked to form the axle 61. The shaft and the race member 64 and the shaft may not be separated, and a preload may be applied between the rolling element and the raceway surface.

FIG. 8 shows a fifth embodiment, and shows 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 brake rotor 40 and a hub bolt 75 for wheel mounting are formed on the wheel mounting flange 74.
Is provided.

Also in the above embodiment, a thin film is interposed between the brake rotor mounting surface 74a of the wheel mounting flange 74 and the abutment surface 40b of the brake rotor 40 which abuts on the brake rotor mounting surface 74a. I have.
Further, the wheel mounting flange 74 is inclined toward the outer side, and the inclination angle θ is set within 20 minutes. Further, the runout of the brake rotor mounting surface 74a of the wheel mounting flange 74 is restricted to a standard value of 30 μm or less, the flatness of the outer peripheral portion and the circumferential flatness are set to 30 μm or less, and the wheel mounting flange 74 is mounted on the wheel mounting flange 74. Brake rotor 4
The flatness of the abutting surface and the flatness in the circumferential direction with respect to the wheel mounting flange 74 of No. 0 are 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 runout width of the braking surface 40a of the brake rotor 40 is specified to be 50 μm or less.

[0065]

As described above, in the wheel bearing device according to the present invention, between the brake rotor mounting surface of the wheel mounting flange and the brake rotor abutting surface that abuts the brake rotor mounting surface. When a thin film is interposed,
At the time of assembling the wheel, the gap which is a deformation factor of the brake rotor is filled, so that the deformation of the brake rotor is suppressed, and the brake judder can be easily and inexpensively prevented.

[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 perspective view showing a brake rotor mounting surface of the wheel bearing device and an abutting surface of the brake rotor.

FIG. 4A is an enlarged schematic view showing a state before tightening of a brake rotor mounting surface and an abutting surface of a brake rotor of the wheel bearing device according to the present invention, and FIG. 4B is an enlarged schematic diagram of the wheel bearing device according to the present invention. Enlarged schematic view showing the state after tightening of the brake rotor mounting surface and the abutment surface of the brake rotor

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

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

FIG. 7 is a longitudinal sectional front view showing a fourth embodiment of the wheel bearing device according to the present invention.

FIG. 8 is a longitudinal sectional front view showing a fifth embodiment of the wheel bearing device according to the present invention.

FIG. 9 (I) is a perspective view showing a measurement state of the circumferential flatness of the wheel mounting flange, and FIG. 9 (II) is an explanatory view of measuring the circumferential flatness from the measurement result.

FIG. 10 is a longitudinal sectional front view showing a conventional wheel bearing device.

11A is an enlarged schematic view showing a state before tightening a brake rotor mounting surface of a conventional wheel bearing device and an abutting surface of a brake rotor, and FIG. 11B is a brake rotor mounting surface of a conventional wheel bearing device. Schematic diagram showing the state after tightening of the abutment surface of the brake rotor and the brake rotor

[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 40b abutment 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

Claims (16)

[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 mounted between the opposed rolling surfaces. A wheel bearing device having a wheel mounting flange provided on one of the outer member and the inner member, and having an outer side surface of the wheel mounting flange as a brake rotor mounting surface. A wheel bearing device comprising a thin film interposed between a brake rotor mounting surface on a wheel mounting flange side and a brake rotor side abutting surface which abuts on the brake rotor mounting surface. 2. The thin film is softer than steel and has a thickness of 5-20
The wheel bearing device according to claim 1, which has a thickness of 0 µm. 3. The wheel bearing device according to claim 1, wherein the thin film is a resin sheet made of an age hardening material. 4. The wheel bearing device according to claim 1, wherein the thin film is an acrylic-enamel paint. 5. The wheel bearing device according to claim 1, wherein the thin film is an anaerobic acrylic adhesive. 6. The thin film is a coating film formed on at least the brake rotor mounting surface on the wheel mounting flange side and the abutting surface on the brake rotor side abutting on the brake rotor mounting surface. Item 6. The wheel bearing device according to any one of Items 1 to 5. 7. The wheel bearing device according to claim 1, wherein the wheel mounting flange is inclined toward the outer side at an angle of 20 minutes or less. 8. The wheel bearing device according to claim 1, wherein a run-out width of the wheel mounting flange at the time of rotation of the outer side surface is regulated within a standard value. 9. The wheel bearing device according to claim 8, wherein the standard value is 30 μm or less. 10. 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 30 μm or less. 11. A flatness in a circumferential direction of an outer peripheral portion on a brake rotor mounting surface of the wheel mounting flange is 30 μm.
The wheel bearing device according to any one of claims 1 to 10, wherein m is not more than m. 12. The wheel bearing device according to claim 1, wherein the wheel mounting flange is provided on an inner member. 13. 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.
The wheel bearing device according to any one of claims 1 to 12, comprising an inner ring having the other rolling surface formed on the outer periphery. 14. The inner member has a wheel mounting flange, and a hub wheel having one rolling surface formed directly on the outer periphery, and a other rolling surface formed directly on the outer periphery of the shoulder. 14. The wheel bearing device according to claim 1, comprising an outer joint member of a speed universal joint, wherein a hub wheel is engaged with a spline provided on the outer joint member to enable torque transmission. 15. The wheel bearing device according to claim 14, wherein a run-out width of the brake surface of the brake rotor during rotation is regulated within a standard value. 16. The wheel bearing device according to claim 15, wherein the standard value of the surface runout width is 50 μm or less.