JP2003148527A - Bearing device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a disk rotor to exhibit a prescribed brake performance even if it tilts toward brake pads in a bearing device for a vehicle. SOLUTION: This bearing device for the vehicle is so constituted that torque transmission bolts 8 are penetrated and fixed into through holes 14 provided in circumference of a flange 13 from the vehicle inner side to the vehicle outer side and an elastic ring 17 allowing the disk rotor such an attitude change as to follow and planarly abut on the brake pads by the clamping loads of the brake pads 7a and 7b to the disk rotor is disposed in the fitting part of the disk rotor 5 to the flange. When the disk rotor receives the clamping loads from the brake pads, it is made to follow and abut on the brake pads so as to exhibit the prescribed brake performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle bearing device in which a disc rotor of a disc brake device is mounted on a side face of a hub wheel on a vehicle outer side of a radially outward flange.

[0002]

2. Description of the Related Art FIG. 5 is a vertical cross-sectional view of a conventional vehicle bearing device, and FIG. 6 is a diagram used to explain the behavior of a disk rotor and a brake pad during brake operation. In FIG. 5, reference numeral 1 denotes the entire vehicle bearing device. 2 is a hub wheel, 3 is a rolling bearing, 4 is a drive shaft,
5 is a disc rotor, 7a and 7b are brake pads,
8 is a bolt and 9 is a nut.

The brake pads 7a, 7b are attached to the vehicle body side such as calipers and knuckles in a posture of facing both side surface regions of the disk rotor 5. Also,
Through holes 14 are provided at several circumferential positions of a radially outward flange 13 provided on the outer peripheral surface of the hub wheel 2. The bolt 8 is fitted and fixed in the through hole 14. In this case, the serrations 8 b of the bolt 8 are bite into the circular inner peripheral surface of the through hole 14.

The disk rotor 5 is fixedly fixed to the flange 13 by tightening a nut 9 screwed on the penetrating end of the bolt 8 in a state where the disk rotor 5 is closely attached to the vehicle outer side surface of the flange 13. .

When the brake is operated, both brake pads 7a and 7b are brought into pressure contact with the disk surface of the disk rotor 5 during rotation and at the start of rotation, so that the brake is applied.

[0006]

By the way, in the case of the conventional vehicle bearing device, the hub bolt 8 is pierced by the serration 8b of the hub bolt 8 with respect to the circular inner peripheral surface of the through hole 14 of the flange 13. When it is fitted into the flange 13, a force is applied to the peripheral area of the bolt through hole 14 in the flange 13 so as to bulge in the fitting direction.

Such an acting force is slightly different for each peripheral region of each of the bolt through holes 14 at several places on the circumference. Therefore, although the disk rotor mounting surface of the flange 13 is minute, its flatness is lowered.

As a result, the adhesion of the disc rotor 5 to the flange 13 is reduced, and the disc rotor 5 is moved to the position shown in FIG.
As exaggeratedly shown, the posture may be inclined with respect to the brake pads 7a and 7b. In this case, when both brake pads 7a and 7b move from the solid line position to the virtual line position due to the brake operation, the brake pad 7
Since a and 7b do not come into full contact with the disc rotor 5 and are in a one-sided contact state, brake squeal is generated or braking performance is deteriorated.

In order to solve such a problem, the applicant of the present invention improves the flange structure in, for example, Japanese Patent Application No. 2000-232874 so that the disc rotor 5 is not tilted with respect to the brake pads 7a, 7b. Have already filed several applications.

The present invention is different from the invention filed by the applicant of the present application, and it is assumed that the disk rotor 5 is the brake pad 7
Even if the posture is inclined with respect to a and 7b, the brake pad contact surface of the disc rotor 5 is made to follow the postures of the brake pads 7a and 7b when the brake is operated. It is designed to demonstrate braking performance.

[0011]

SUMMARY OF THE INVENTION The present invention is a bearing device for a vehicle, wherein a disc rotor of a disc brake device is attached to a vehicle outer side surface of a radially outward flange provided on a hub wheel. A through hole along the axial direction is provided at several places on the circumference of the flange, and a torque transmitting bolt for the disk rotor penetrates through the through hole from the vehicle inner side to the vehicle outer side. At the position where the disc rotor is attached to the flange, the posture change allowance is allowed to allow the disc rotor to be brought into surface contact with the brake pad by the sandwiching load of the brake pad to the disc rotor. Means are provided.

In this embodiment, this attitude change permitting means is
As the elastic body, either one of the elastic ring and the elastic cylindrical body or a combination of both, and in some cases, a nut is further included, but not limited to these. For example, it may be an elastic body that is fixed, adhered or adhered to either or both of the vehicle outer side surface of the flange and the vehicle inner side surface of the inner diameter side of the disc rotor, and only rubber or resin is used as the elastic body. Alternatively, a member made of a metal material may be used as long as it has a function of permitting a posture change, and all of them are included.

According to the present invention, the disc rotor is not rigidly fixed to the flange, but is disposed such that its posture can be changed by the posture change permitting means. As a result, even if the mounting posture of the disc rotor with respect to the flange is inclined with respect to the posture of the brake pad, if the brake pad is pinched from both sides of the disc rotor during brake operation, the disc rotor will be pinched by the brake pad. You will be imitated by the posture in which the brake pad and the entire surface are contacted. This makes it possible to prevent so-called brake squeal and deterioration of brake performance.

In this case, when the attitude changing permitting means is constituted by an elastic body interposed between the flange and the disk rotor in a state where the flange and the disk rotor are spaced apart from each other, vibration from the flange to the disk rotor is generated. Therefore, the natural frequency of the entire vehicle bearing device can be reduced outside the so-called brake squeal frequency range. Further, even if the machining accuracy of the bolts and nuts is lowered, the braking performance can be maintained in a required state, so that the machining cost can be reduced.

In the present invention, it is preferable that the posture change permitting means is inserted in a state in which the posture changing permitting means is compressed in the axial direction and partially protrudes from the expanded diameter portion provided on the vehicle outer side of the through hole of the flange. A first member, a second member that is inserted into the through hole of the disc rotor in a state where a part thereof protrudes toward the vehicle outer side, and the second member that is screwed on the protruding end side of the bolt Compress the member in the axial direction,
It may be configured by a nut that couples the disk rotor to the flange in a separated state.

[0016]

DETAILED DESCRIPTION OF THE INVENTION The details of the present invention will be described below based on the embodiments shown in the drawings. The vehicle bearing device of this embodiment is applied to a vehicle.

1 to 4 show an embodiment of the present invention. FIG. 1 is a vertical cross-sectional view of a vehicle bearing device of an embodiment, FIG. 2 is an exploded perspective view showing the hub bolt shown in FIG. 1 and parts assembled to the hub bolt in an enlarged manner, and FIG.
An enlarged view of the main part around the hub bolt shown in FIG.
FIG. 4 is a diagram used for explaining the behavior of the disc rotor and the brake pad during the brake operation. Note that FIG.
The right side is the vehicle inner side and the left side is the vehicle outer side.

First, referring to FIGS. 1 to 3, 1 is
Vehicle bearing device, 2 is a hub wheel, 3 is a double row rolling bearing, 4 is a drive shaft, 5 is a disc rotor, 6 is a knuckle, 7a and 7b are brake pads,
8 is a hub bolt, 9 is a nut, and 10 is a wheel.

The vehicle bearing device 1 includes a hub wheel 2 and
A double row rolling bearing 3 is fitted on the hub wheel 2. The drive shaft 4 is inserted and coupled to the center hole 2a of the hub wheel 2 so as to be integrally rotatable in the circumferential direction.

The double-row rolling bearing 3 includes one inner ring 3a having a single track fixed to the outer circumference of the hub wheel 2 by a small diameter, and a single outer ring 3b having two rows of track grooves. A plurality of balls 3c, 3c arranged in a row and two crown-shaped cages 3d, 3d are provided, and the large diameter outer peripheral surface of the hub wheel 2 is the other inner ring. Further, the flange 12 radially outward with respect to the outer peripheral surface of the outer ring 3 b of the double row rolling bearing 3.
Is provided, and the knuckle 6 which is a part of the vehicle body is attached to the flange 12.

A radially outward flange 13 for mounting the disc rotor 5 and the wheel wheel 10 is provided on the vehicle outer side end of the large diameter outer peripheral surface of the hub wheel 2.

Bolt through holes 14 are provided at several circumferential positions of the flange 13 along the axial direction. Also,
Bolt insertion holes 15 along the axial direction corresponding to the bolt through holes 14 are also provided at several circumferential positions on the inner diameter side of the disk rotor 5. Furthermore, the wheel wheel 10
Also, at several places around the circumference, bolt insertion holes 16 are provided corresponding to the holes 14 and 15 along the axial direction.

In the present embodiment having the above-mentioned structure, the bolt through holes 14 provided at several circumferential positions of the flange 13 are provided with
A bolt 8 for transmitting torque to the disc rotor 5 is fixed in a state of penetrating from the vehicle inner side toward the vehicle outer side, and a mounting load of the brake pad on the disc rotor 5 is applied to a mounting portion of the disc rotor 5 on the flange 13. The elastic ring 17 is provided as a posture change permitting means for permitting the posture change so that the disc rotor 5 is brought into surface contact with the brake pads 7a and 7b, and the characteristic thereof will be described in detail below. .

That is, the bolt through hole 1 of the flange 13
In the opening 4 of the vehicle outer side surface 13a, the diameter 4 is expanded to form the expanded diameter portion 13b. The flange 13 portion of the expanded diameter portion 13b serves as a disk rotor mounting portion, and a part of the expanded rubber portion 13b protrudes toward the vehicle outer side while being compressed in the axial direction with respect to the expanded diameter portion 13b. An elastic ring 17 consisting of is fitted. The elastic ring 17 has a bolt through hole 17a corresponding to the outer diameter of the bolt 8 as a first member that constitutes the posture change allowing means.

In the disc rotor 5, the vehicle inner side surface 5a on the inner diameter side is separated from the vehicle outer side surface 13a of the flange 13 by the protrusion thickness of the elastic ring 17 via the elastic ring 17. As a result, the flange 13 is placed in a floating state with respect to the disk rotor mounting portion.

The elastic ring 17 is provided between the vehicle inner side surface 5a of the disc rotor 5 and the disc rotor mounting portion of the flange 13 by tightening a nut 9 screwed to the vehicle outer side protruding portion 8a of the hub bolt 8. Is in an elastically compressed state. In this case, the nut 9
It is a member that constitutes a part of the posture change permitting means.

A cylindrical float collar 18 is inserted into the hub bolt portion between the inner end surface 9a of the nut 9 and the vehicle outer side surface 5b on the inner diameter side of the disk rotor 5.

The cylindrical float collar 18 has an elastic cylindrical body 1 as a second member which constitutes a posture change permitting means.
9 is attached. The elastic cylindrical body 19 includes a vehicle outer side large diameter portion 19a and a vehicle inner side small diameter portion 19b.

Large outer diameter portion 19 of the elastic cylinder 19 on the vehicle outer side
In a natural state before tightening the nut 9, one end side is longer than the wall thickness of the wheel wheel 10 in the vehicle inner side direction from the float collar 18 in a state in which one end side is inserted and fitted into the float collar 18 and attached. It is projected in the state. In addition, this vehicle outer side large diameter portion 19
The protruding state of a is not shown.

The vehicle inner side small diameter portion 19b of the elastic cylindrical body 19 is made longer in the axial direction than the hole length of the bolt insertion hole 15 of the disk rotor 5 in the natural state before tightening the nut 9. The natural state of the vehicle inner side small diameter portion 19b is not shown.

Therefore, when the nut 9 is tightened while the float collar 18 is inserted between the inner end surface 9a of the nut 9 and the vehicle outer side surface 5b on the inner diameter side of the disc rotor, the wheel wheel 10 is floated. Outer side surface 5b of the collar 18 and the disk rotor 5 on the vehicle outer side
The vehicle outer side large diameter portion 19a of the elastic cylindrical body 19 is held in a compressed state.

The small diameter portion 19b on the vehicle inner side of the elastic cylindrical body 19 has a bolt insertion hole 15 in the disk rotor 5.
And is compressed into the elastic ring 17 in a pressure contact state.

In the case of the present embodiment having the above configuration,
Elastic ring 17 with nut 9 tightened
Between the vehicle outer side surface 13a of the flange 13 and the vehicle inner side surface 5a of the disc rotor 5 is compressed into a state in which it can be elastically deformed according to a required external force applied to the brake pad contact surface of the disc rotor 5. ing.

Next, the vehicle outer side surface 1 of the flange 13
Depending on how the disc rotor 5 is attached to 3a,
The brake pad contact surface of the disc rotor 5 is shown in FIG.
As shown by the solid line, it is assumed that the brake pads 7a and 7b are inclined to the left, for example. When both brake pads 7a and 7b are moved in the directions indicated by arrows Pa and Pb in the drawing during braking, the disc rotor 5 is sandwiched between both brake pads 7a and 7b and sandwiched between both brake pads 7a and 7b. Receive a load.
At this time, since the posture of the disc rotor 5 can be changed by the elastic ring 17, the posture thereof is sequentially changed in the direction shown by the one-dot chain line and the two-dot chain line, and the brake pad 7a of the disc rotor 5 is changed. , 7b, and their postures are corrected so as to come into contact with them. As a result, both brake pads 7a and 7b can be applied to the disc rotor 5 with the same pressure contact force, and the required braking performance can be exhibited.

Therefore, according to the present embodiment, the serration 8b of the bolt 8 is bitten into the circular inner peripheral surface of the bolt through hole 14, and the disc rotor 5 is braked for the reason described in the prior art. Pads 7a, 7
Even if the posture is inclined with respect to b, the brake pad contact surface of the disc rotor 5 is made to follow the postures of the brake pads 7a and 7b during the braking operation, and the desired braking performance is obtained. Can be demonstrated.

The bearing device for a vehicle of the present invention is not limited to the above-described vehicle bearing device, and in other machines and devices, a vehicle outer side surface of a radially outward flange provided on the hub wheel. On the other hand, the invention can be applied to all vehicle bearing devices to which the disc rotor of the disc brake device is attached.

[0037]

As described above, according to the present invention,
At the mounting portion of the disc rotor with respect to the radially outward flange provided on the hub wheel, the posture change permitting means for causing the disc rotor to face the surface by following the brake pad with the sandwiching load by the brake pad is provided. Even if the disc rotor is in an inclined posture with respect to the brake pad, the disc rotor is made to face the surface by following the brake pad, and the desired braking performance can be exhibited.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a bearing device for a vehicle according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of each component forming the main part of FIG.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a diagram used to explain the behavior of a disc rotor and a brake pad in FIG.

FIG. 5 is a vertical sectional view of a conventional vehicle bearing device.

FIG. 6 is a diagram used to explain the behavior of the disc rotor and the brake pad in FIG.

[Explanation of symbols]

1 Vehicle bearing device 2 hub wheels 3 Double row rolling bearing 4 drive shaft 5 disk rotor 7a, 7b Brake pad 8 volt 8b serration 9 nuts 10 wheel wheel 14 bolt through hole 15 bolt insertion hole 17 Elastic Ring 18 float color 19 Elastic cylinder

Claims (3)

[Claims] 1. A bearing device for a vehicle, in which a disc rotor of a disc brake device is attached to a vehicle outer side surface of a radially outward flange provided on a hub wheel, wherein the flange is provided at several circumferential positions. A through hole is provided along the axial direction, and a torque transmitting bolt for the disc rotor is fixed to the through hole in a state of penetrating from the vehicle inner side toward the vehicle outer side. At the mounting portion of the disc rotor with respect to, the posture change permitting means for permitting the posture change so that the disc rotor is brought into surface contact with the brake pad by the sandwiching load of the brake pad with respect to the disc rotor is provided. A bearing device for a vehicle characterized by the above. 2. The vehicle bearing device according to claim 1, wherein the attitude change allowing means is an elastic body interposed between the flange and the disc rotor in a state where the two are separated from each other. A bearing device for a vehicle characterized by the above. 3. The vehicle bearing device according to claim 1, wherein the attitude change allowing means is compressed in an axial direction with respect to an enlarged diameter portion provided on the vehicle outer side of the through hole of the flange. A first member that is fitted in a state where a part thereof projects, a second member that is fitted in a state where a part of the disk rotor projects toward the outer side of the through hole of the disk rotor, and a projecting end side of the bolt. A nut that is screwed to compress the two members in the axial direction and couples the disc rotor to the flange in a separated state.
A bearing device for a vehicle characterized by the above.