JPH07103268A - Disk brake device - Google Patents

Abstract

PURPOSE:To obtain a disk brake device not to be affected by partial abrasion of a brake pad by performing chamfering of the part having a little abrasion out of the frictional surfaces of an inner pad or an outer pad. CONSTITUTION:When a disk brake device is operated, a disk rotor is pressed by surfaces other than the chambering part when pad friction surfaces 5a, 5b are new. Moreover, since an inner pad 5 is fixed to the rotational direction, the upper part of the inner pad 5 is strongly brought in pressure-contact with the disc rotor, thereby the outlet side in the rotational direction of the disc rotor of an outer pad 6 is strongly brought in pressure-contact with the disc rotor and worn. Since the surface other than the chamfering part is firstly brought in contact with the disc rotor in braking even if the pad friction surfaces 5a, 6a are partially worn, braking can be performed by increasing the area where the pads are brought in contact with the disc rotor. Accordingly, the brake squeal caused by a slight contact can be decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake device for stopping a disc rotor attached to a wheel with a pad for braking an automobile.

[0002]

2. Description of the Related Art In a disc brake device used in an automobile, a disc rotor is arranged between two brake pads, and one of the brake pads is moved in the rotational direction of the disc rotor through a mounting in which the knuckle is fixed. Some of them hold it so that the brake force is applied by pressing the two brake pads onto the disc brake.

In a disc brake device 1 shown in FIG. 5, a driving piston 3 is housed in a caliper 2, and the piston 3
A support member (claw) 4 that extends from the outer circumference of the caliper and faces the advancing direction of the piston 3 is arranged in front of the, and an inner pad 5 is arranged in front of the piston so that the support member 4 supports the outer pad 6. Inner pad 5 is mounting 7
Is made movable only in the piston sliding direction, and the mounting 7 is fixed to the knuckle. Further, the caliper 2 can be moved by a slide pin 8 provided on the mounting 7. The outer peripheral portion of the disc rotor 9 is located between the inner pad 5 and the outer pad 6. A disc brake device having such a structure is also disclosed in Japanese Patent Laid-Open No. 3-79820.

When the disc brake device 1 is actuated, the piston 3 moves to the disc rotor side, and the support member 4 of the caliper 2 moves to the disc rotor side by the slide pin 8, so that the inner pad 5 and the outer pad 6 are formed. Can be crimped onto the disc rotor 9 for braking.

[0005]

By the way, in the above-mentioned disc brake device 1, the caliper 2 is provided with the slide pin 8.
When braking, the torque applied to the inner pad 5 is received by the mounting 7 and the torque applied to the outer pad 6 is received by the slide pin 8 during braking. Therefore, as shown in FIG. 6, a rotational moment acts on the caliper 2 to cause the drag of the brake, and the pad friction surface is worn in the direction in which the force is applied.

That is, a part of the friction surface of the pad is abraded and becomes unevenly worn, and the inner pad 5 is particularly abraded at the upper portion (marked by X in the figure) of the friction surface 5a as shown in FIG. As shown in FIG. 8, the outer pad 6 is particularly worn on the outlet side (marked with X in the figure) that follows the traveling direction A of the rotation of the disk rotor 9. For this reason, the surface pressure of each pad where the wear is small is high, so that this portion may come into contact with the brake squeal during non-braking or light braking. In addition, in order to prevent uneven wear
In the publication, there is a pad in which the front and rear ends in the rotation direction of the rotor are chamfered so as to correspond to the pressing force of the claw.

An object of the present invention is to provide a disc brake device which is not affected by uneven wear of a brake pad.

[0008]

In order to achieve the above object, the present invention provides an outer pad supported by inner pads provided in the caliper and support members on the outer circumference of the caliper on both outer peripheral surfaces of a disk rotor attached to a wheel. In the disc brake device in which the inner pad and the outer pad are pressed against both sides of the disc rotor, chamfering is performed on a portion of the friction surface of the inner pad and the outer pad that is less worn. And

In the above disc brake device, of the friction surfaces of the inner pad and the outer pad, the inner pad is chamfered at the lower part of the friction surface, and the outer pad is the friction surface that abuts the inlet side in the rotational direction of the disc rotor. The feature is that the side part is chamfered.

[0010]

Since the present invention is configured as described above, when the disc brake device is slightly actuated, most of the chamfered friction surface is lightly pressed against the disc rotor. Then, a moment is applied to the caliper by the torque generated by the pulling in of the frictional force at the time of braking, and the pad friction surface is worn away by the frequent use of braking.

When braking is performed in such a situation, the pad friction surface with less wear comes into light contact with the disk rotor first, but the friction surface between the inner pad and the outer pad is less worn. Since the chamfering is performed, the other portion comes into contact with the disk rotor first and press-bonds, so that the area of contact with the disk rotor can be increased.

Particularly in the caliper floating type, the lower part of the inner pad and the side part of the outer pad which comes into contact with the inlet side of the disk rotor in the rotating direction come into contact with the disk rotor later.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the disc brake device 1
The caliper 2 is disposed so as to face the outer circumference of the disc rotor 9 attached to the wheel, the inner pad 5 and the outer pad 6 are disposed in the caliper 2, and the disc rotor 9 is interposed between them.
The outer peripheral surface of is located. Inside the caliper 2, a piston 3 is slidably provided so as to move the inner pad 5 whose rotation direction of the disc rotor 9 is fixed by a mounting 7 to the disc rotor 9 side.
The outer pad 6 is supported by a claw (support member) 4 extending from the caliper 2.

Then, the portions of the pad friction surfaces 5a, 6a of the inner pad 5 and the outer pad 6 which are less worn are chamfered. As shown in FIG. 2, the inner pad 5 has a tapered lower portion 5b of the friction plate. The outer pad 6 is chamfered to form a taper chamfer on the side portion 6b of the disk rotor 9 that faces the rotation direction A (see FIG. 3).

When the disc brake device 1 constructed as described above is operated, when the pad friction surfaces 5a and 6a are new, the disc rotor 9 is pressed by a surface other than the chamfered portion. Further, since the inner pad 5 is fixed in the rotation direction, the upper portion of the inner pad 5 is strongly pressed against the disk rotor 9, and the outlet side of the outer pad 6 in the rotation direction of the disk rotor 9 is strongly pressed and worn.

Even if the pad friction surfaces 5a and 6a wear unevenly,
During braking, the surfaces other than the chamfered portion come into contact with the disk rotor 9 first, so that the area in contact with the pads can be increased for braking. Therefore, it is possible to reduce the squeal of the brake caused by a slight contact.
In addition, also in the disc brake device 1 shown in FIG.
By chamfering the surfaces of the inner pad 5 and the outer pad 6 that are less likely to wear, brake squeal can be reduced and braking can be reliably performed.

[0017]

Since the present invention is constructed as described above, even if the inner pad and the outer pad are unevenly worn, the contact surface with the disk rotor is chamfered by chamfering during non-braking or light braking. Is maintained, braking is ensured, and brake squeal can be reduced.

[Brief description of drawings]

FIG. 1 is a development view of a disc brake device according to an embodiment of the present invention.

FIG. 2 is a perspective view of an inner pad of the disc brake device shown in FIG.

3 is a perspective view of an outer pad of the disc brake device shown in FIG. 1. FIG.

FIG. 4 is a development view of a disc brake device according to another embodiment.

FIG. 5 is a top view of a conventional disc brake device.

FIG. 6 is a top view of the disc brake device shown in FIG. 5 during operation.

7 is a perspective view of an inner pad of the disc brake device shown in FIG.

8 is a perspective view of an outer pad of the disc brake device shown in FIG.

[Explanation of symbols]

 1 disc brake device 2 caliper 5 inner pad 5a friction surface 5b lower 6 outer pad 6a friction surface 6b side 9 disc rotor

Claims (2)

[Claims] 1. An inner pad provided in a caliper and an outer pad supported by a supporting member on the outer circumference of the caliper are exposed on both outer peripheral surfaces of a disc rotor attached to a wheel, and the inner pad and the outer pad are provided on the disc rotor. In a disc brake device that is crimped on both sides, a chamfered portion of the friction surface of the inner pad and the outer pad that is less worn is chamfered. 2. Of the friction surfaces of the inner pad and the outer pad, the inner pad chamfers a lower portion of the friction surface, and the outer pad chamfers a side portion of the friction surface corresponding to the inlet side of the disc rotor in the rotation direction. The disc brake device according to claim 1, wherein the disc brake device is provided.