JP2587717Y2 - Friction pad return structure for vehicle disc brake - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake used for a vehicle such as an automobile or a motorcycle. More specifically, the present invention relates to a friction pad arranged on both sides of a disk rotor so as to be movable in a disk axial direction. The present invention relates to a friction pad return structure that can be forcibly pulled back from a disk rotor when not in operation to effectively prevent uneven wear of a lining and brake squeal.

[0002]

2. Description of the Related Art As a structure for returning a friction pad, for example, Japanese Utility Model Publication No. 61-2826 and Japanese Utility Model Publication No. 60-21566.
There is one shown in Japanese Patent Publication No.

In the former technique, a return spring is formed by a substantially V-shaped base formed by bending a wire in two steps, and a locking portion formed by bending both ends of the base in the same direction. The slightly inclined portion extends in the direction away from the friction pad and is locked in the rotor groove of the caliper body, and the locking portions at both ends are formed in small holes formed on the outer surface of the friction pad in the radial direction of the disk. Mated.

[0004] In the latter technique, two pad retainers and one pad spring are combined to constitute a holding member. The pad retainer includes a locking portion attached to a back plate of a friction pad and a locking portion. There is provided a curved portion protruding from the locking portion toward the rear surface of the back plate, and a pressing plate folded from the curved portion toward the locking portion and pressed against the caliper support arm.
On the other hand, the pad spring has a loop portion that applies a spring force in the length direction to an intermediate portion, and a bent portion for engagement at both ends, and each pad retainer is placed on the disk reciprocating side of the back plate. Attachment, the locking bent portion of the pad spring is engaged with the locking hole of the pad retainer.

In these techniques, the resilient force of a return spring or a pad spring is applied to the friction pad in a direction away from the disk rotor, and the friction pad during non-braking is forcibly separated from the side surface of the disk rotor. It is designed to prevent uneven wear and brake squeal due to lining drag.

[0006]

In these arrangements, the return spring and the pad spring are displaced outwardly of the friction pad in the radial direction of the disk or on the disk reversing side of the friction pad. The force acts as an eccentric load.

For this reason, in the former type in which the return spring is mounted on the outer surface of the friction pad in the radial direction of the disk, the outer side of the friction pad in the radial direction of the disk is pushed by the return spring so as to fall on the opposite side to the disk rotor. A rotational moment is generated in the pad, and on the inner side in the radial direction of the disk, the lining approaches the disk rotor and the lining is dragged by the disk rotor.

On the other hand, in the latter type in which the holding member is attached to the disc reciprocating side of the friction pad, the disc reciprocating side of the friction pad is pushed open by the pad spring toward the anti-disc rotor side, so that a rotational moment is applied to the friction pad. Then, the disk outlet side approaches the disk rotor,
As in the former case, the disk was pulled by the disk rotor, and none of them could sufficiently prevent uneven wear of the lining or brake squeal.

The present invention has been made in view of the above circumstances, and a friction pad that can reliably withdraw the friction pad during non-braking from the side surface of the disk rotor to prevent uneven wear of the lining and brake squeal. It is intended to provide a pad return structure.

[0010]

According to the first object of the present invention, there is provided a caliper bracket fixedly mounted on a vehicle body, having a pair of caliper supporting arms extending over the outside of a disk rotor in a disk axial direction. Pad guides are provided on both caliper support arms so as to face each other, and lugs are provided on both sides of the back plate of the friction pad disposed with the disk rotor interposed therebetween. In a vehicle disk brake supported via a retainer, a disk radial outer surface of the lug is inclined so as to gradually move away from a disk axis in a direction opposite to a disk rotor, and an outer support parallel to the disk axis is mounted on the pad retainer. And a pad resilient piece inclined in such a manner as to gradually approach the disk axis in the direction of the anti-disk rotor, and the pad resilient piece is attached to the friction pad. Is brought into contact in the disc radially innermost surface, the disk radially outer surface of the ear piece,
It is supported by the outer receiving piece.

In the second invention, a pair of caliper support arms extending in the axial direction of the disk from outside of the disk rotor are extended to a caliper bracket fixedly mounted on the vehicle body, and a pad guide portion is opposed to both caliper support arms. Disc brakes for a vehicle, wherein lugs project from both sides of a back plate of a friction pad disposed with the disc rotor interposed therebetween, and the lugs are supported on the pad guides via pad retainers. In the disk radial outer surface of the lugs, and the disk radial innermost surface of the friction pad, respectively, inclined gradually away from the disk axis in the direction opposite to the disk rotor, the pad retainer, the disk shaft, A parallel outer receiving piece and a pad elastic piece are formed, and the pad elastic piece is brought into contact with the radially innermost surface of the friction pad in the disk radial direction. The disc radially outer surface of the ear piece is supported by the outer receiving piece.

[0012]

The friction pad disposed on the side of the disk rotor is held in parallel with the side surface of the disk rotor by the back surface of the back plate abutting against the piston or reaction force claw of the caliper body, and the innermost in the disk radial direction. The disk rotor side corner of the side surface is supported by the pad repelling piece of the pad retainer, and the anti-disk rotor side corner of the disk radially outer surface of the ear piece is supported by the outer retainer of the pad retainer. In addition, the elastic force of the pad elastic piece acts on the friction pad outward in the radial direction of the disk, and the friction pad is held by the pad elastic piece and the outer receiving piece without play.

[0013] The friction pad at the time of braking,
The disk moves toward the disk rotor while being pushed inward in the disk radial direction. The friction pad for which the braking operation has been released is the innermost surface of the friction pad in the radial direction of the disk, the outer surface of the lug in the radial direction of the disk, or the inclination of the pad resilient piece, and the pad rebounding outward in the radial direction of the disk. The particles are pushed back to the side opposite to the disk rotor.

When the friction pad tries to tilt due to the retraction of the piston or the reaction force claw pushing the friction pad, the inclination of the friction pad is changed to the innermost surface in the disk radial direction or the outer side of the ear piece in the disk radial direction. Due to the inclined shape of the side surface and the pad resilient pieces, the disk is located on the innermost side in the radial direction of the disk closest to the disk rotor and on the side opposite to the disk rotor with the fulcrum as a fulcrum, and does not protrude toward the disk rotor.

[0015]

1 to 5 show a first embodiment of the present invention.
It will be described based on.

The disc brake 1 includes a disc rotor 2 which rotates integrally with wheels (not shown) in the direction of arrow A when the vehicle travels, a caliper bracket 3 fixed to the vehicle body at one side of the disc rotor 2, Caliper bracket 3
The caliper body 5 is supported by the caliper support arms 3a, 3a via a pair of slide pins 4, 4 so as to be movable in the axial direction of the disc, and the inside of an action portion 5a and a reaction portion 5b of the body 5, It is composed of a pair of friction pads 6 and 6 that are opposed to each other with the disk rotor 2 interposed therebetween.

The caliper body 5 is a divided type in which a pair of caliper halves 5d and 5e are integrally connected by four connecting bolts 7, and one of the caliper halves 5d is
And the other caliper half 5e is arranged so as to straddle the reaction portion 5b disposed on the other side of the disk rotor 2 and the reaction portion 5b disposed on the other side of the disk rotor 2. The bridge portion 5c is provided.

The working portion 5a is provided with a cylinder hole 8 having an opening on the disk rotor 2 side. The cylinder hole 8 accommodates a cylindrical piston 9 having a bottom.
The cylinder hole 8 is moved in the direction of the disk rotor by the pressure liquid supplied to the hydraulic chamber 10 at the bottom of the cylinder hole. Further, vehicle body mounting arms 5f, 5f protrude from the side of the action portion 5a, and the above-mentioned slide pin 4 is mounted on a tip of each vehicle body mounting arm 5f by a mounting bolt 11, respectively. I have.

The friction pad 6 has a lining 12 that slides on the side surface of the disk rotor 2 and caliper support arms 3a, 3a.
and a metal back plate 13 held by a. On both sides of the back plate 13, ear pieces 13 for suspension are provided.
a, 13a are protrudingly provided, and the outer surface 13b in the disk radial direction of each ear piece 13a is an inclined surface which expands outward as the distance from the lining 12 increases.

The caliper supporting arms 3a, 3a straddle the outside of the disk rotor 2 in the disk axial direction from both sides of the caliper bracket 3 while sandwiching both sides of the bridge portion 5c. It is shaped to extend toward the center of the disk along the side wall of the portion 5b. The distal ends of the caliper support arms 3a, 3a are connected by a tie bar 3b to increase the rigidity of the support arms 3a, 3a to which a braking torque is applied.

Each caliper support arm 3a is provided with a guide hole 3c for accommodating the above-mentioned slide pin 4, and both caliper support arms 3a, 3a face each other on each side of the disk rotor 2. Four pad guide portions 3d are provided. The pad guide 3d has a so-called upper jaw having a projection 3e on the outer side in the radial direction of the disc. Each friction pad 6 has a lug 13a, 13a of the back plate 13.
To the pad guide portions 3d, 3 on the disk inlet side and the disk outlet side.
d is supported via a pad retainer 14 so as to be movable in the disk axial direction.

The pad retainer 14 has a pair of retainers 14a, 1 fitted on the pad guides 3d, 3d on both sides of the disk rotor on the disk inlet side or the disk outlet side.
4a, a connecting piece 14b for connecting the upper portions of the retainers 14a, 14a across the outside of the disk rotor 2, and a pad spring 1 extending to the retainers 14a, 14a.
4c and 14c.

Each retainer portion 14a has an inner receiving piece 14d and an outer receiving piece 14e facing inward and outward in the disk radial direction.
Are connected by a side piece 14f, and a wider interval than the ear piece 12a is set between the inner receiving piece 14d and the outer receiving piece 14e according to the shape of the pad guide portion 3d. When fitted to the pad guide portion 3d, the inner and outer receiving pieces 14d and 14e are disposed in close contact with the inner wall surface of the pad guide portion 3d and are arranged in parallel with the disk axis.

The pad spring 14c is provided on the inner receiving piece 1
A spring piece 14g inclined inward in the radial direction of the disc from the tip of 4d;
4h. Pad bullets 14h, 14h
When the retainer portion 14a is fitted to the pad guide portion 3d and the pad retainer 14 is assembled to the caliper support arm 3a, each of the inclined portions is inclined so as to approach the disk shaft as the distance from the disk rotor 2 increases. Is arranged.

The lugs 13a of the friction pad 6 are accommodated between the inner receiving piece 14d and the outer receiving piece 14e of the retainer part 14a fitted to the pad guide part 3d, respectively.
The radially outer surface 13b of each ear piece 13a in the disk radial direction is arranged to be inclined away from the disk axis in the direction opposite to the disk rotor.

Further, the pad elastic pieces 14h wrap around the back plate 13 in the radial direction of the disk. This pad bullet 1
4h, as described above, is inclined so as to approach the disk shaft in the direction opposite to the disk rotor, so that it comes into contact with the disk rotor side corner 13d of the innermost surface 13c of the back plate 13 in the disk radial direction, and friction occurs. The pad 6 is ejected outward in the radial direction of the disk, and the outer surface 1 of the ear piece 13a in the radial direction of the disk
In 3b, the non-disk rotor side corner 13e is supported by the outer receiving piece 14e of the retainer 14a.

In this manner, the diagonal portions of the inner and outer surfaces of the friction pad 6 in the radial direction of the disk are supported by the pad retainer 14. On the side of the action portion 5a, the back surface of the back plate 13 is attached to the front end surface of the piston 9. On the side of the reaction portion 5b, the rear surface of the back plate 13 abuts against the reaction force claw 5g.
Is held in parallel with the side surface of the disk rotor 2 to prevent rattling during running and braking.

The present embodiment is configured as described above. When the pressurized hydraulic fluid is supplied to the hydraulic chamber 10 by the braking operation of the driver, the piston 9 moves forward through the cylinder hole 8 and The friction pad 6 on the action portion 5a side is pressed against one side surface of the disk rotor 2. Next, the caliper body 5 is moved in the direction of the action portion 5a by the reaction force while being guided by the slide pins 4 and 4, and the reaction force claw 5g moves the friction pad 6 on the reaction portion 5b side to the other side of the disk rotor 2. Press At this time, on both sides of the friction pads 6 and 6, the pad elastic pieces 14h of the pad retainer 14 are pushed and opened inward in the disk radial direction by the movement of the ear pieces 13a.

On the other hand, when the above-described braking operation is released and the piston 9 and the reaction force claw 5g retreat to the positions before the start of braking,
The pad elastic pieces 14h return outward in the radial direction of the disk. Since the pad repelling piece 14h is inclined so as to approach the disk axis in the direction opposite to the disk rotor, the friction pad 6 is moved in the direction opposite to the disk rotor by the inclined surface as it returns outward in the radial direction of the disk. Go back.

Further, the friction pad 6 has a disk rotor side corner 13d and a disk rotor side corner 13d which are opposite to each other in the disk radial direction inner surface 13c of the back plate 13 and the disk radial direction outer surface 13b of the lug 13a. Since the pad 13 is supported by the pad elastic piece 14h and the outer receiving piece 14e at two points of the corner 13e, even if the piston 9 or the reaction force claw 5g is inclined backward, the inclination is the innermost surface in the disk radial direction. The portion 13c is on the side opposite to the disk rotor with the corner 13d on the disk rotor side as a fulcrum, and does not partially protrude toward the disk rotor 2.

In this embodiment, the elastic force of the pad elastic piece 14h acts on the friction pad 6 from which the braking has been released as described above to urge the friction pad 6 away from the disk rotor 2, and to urge the friction pad 6 away from the disk rotor 2. Since the friction pad 6 is prevented from protruding even partially in the direction, the friction pad 6 can be reliably pulled back from the side surface of the disk rotor 2, and uneven wear of the lining 12 and brake squeal can be effectively prevented.

FIG. 6 shows a second embodiment of the present invention. The pad elastic piece 14h of this embodiment has a rubber sheet 20 adhered to the outer surface, and has an inner receiving piece 14d and an outer receiving piece 14h. Along with 14e, it is provided in parallel with the disk axis.

On the other hand, the friction pad 6 is arranged so that the innermost surface 13c of the back plate 13 in the disk radial direction and the outer surface 13b of the lug 13a in the disk radial direction gradually move away from the disk axis in the anti-disk rotor direction. Sloped,
The innermost surface 13c in the disk radial direction has a disk rotor side corner 13d on the pad resilient piece 14h, and the outer surface 13b of the lug 13a has an anti-disk rotor side corner 13e on the outer receiving piece of the pad guide 3d. 14e are respectively supported via the rubber sheet 20.

In this embodiment, due to the high frictional force of the rubber sheet 20 adhered to the pad elastic piece 14h, the radially outer surface 13b of the rear plate 13 of the back plate 13 from which the braking is released is performed.
But do not slip to the disk rotor 2 side,
Uneven wear of the lining 12 and brake squeal can be more effectively prevented.

[0035]

According to the present invention, the friction pad at the time of release of braking is reliably pulled back from the side surface of the disk rotor by the structure described above. Even if there is a lining, the inclination is to the anti-disc rotor side with the fulcrum at the corner near the disk rotor on the innermost surface in the radial direction of the disk, and it does not protrude partially to the disk rotor side. Uneven wear and brake squeal can be effectively prevented.

Further, since the pad returning operation is performed by using the pad retainer mounted on the pad guide portion, a special member as in the related art is not required, and the economy and the assembling property are excellent.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line II of FIG. 2;

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partial sectional plan view of the disc brake showing the first embodiment of the present invention;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a perspective view of a pad retainer.

FIG. 6 is a sectional side view of a main part of a disc brake showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper bracket 3a ... Caliper support arm 3d ... Pad guide part 5 ... Caliper body 5a ... Working part 5b ... Reaction part 5g ... Reaction force claw 6 ... Friction pad 8 ... Cylinder hole 9 ... Piston DESCRIPTION OF SYMBOLS 10 ... Hydraulic chamber 12 ... Lining of friction pad 6 13 ... Back plate 13a of friction pad 6 Ear piece 13b projecting to the side of back plate 13b ... Disk outer surface of ear piece 13a in the disk radial direction 13c ... Back plate 13 Disk innermost surface 13d in the disk radial direction 13d: Disk rotor side corner of innermost surface 13c in the disk radial direction 13e: Non-disk rotor side corner of disk outer surface 13b in the disk radial direction 14: Pad retainer 14a: Retainer portion 14c: Pad spring 14d ... Inside receiving piece 14e Outside receiving piece 14f Side piece 14g Spring piece 14h Pad bullet Piece 20 ... rotational direction of the rubber sheet A ... disk rotor 2

Claims (2)

(57) [Scope of request for utility model registration] A pair of caliper support arms extending in the axial direction of the disc extending over the outside of the disc rotor on a caliper bracket fixedly mounted on a vehicle body, and pad guide portions provided on both caliper support arms so as to face each other; A disc brake for a vehicle in which ear pieces project from both sides of a back plate of a friction pad disposed with a disk rotor interposed therebetween, and the ear pieces are supported on the pad guide part via a pad retainer, The outer surface of the disk in the radial direction is gradually inclined away from the disk axis in the direction opposite to the disk rotor, and the pad retainer has an outer receiving piece parallel to the disk axis, and gradually approaches the disk axis in the direction opposite to the disk rotor. An inclined pad resilient piece, which is brought into contact with a radially innermost surface of the friction pad in the radial direction of the disc; The radially outer surface of the disk
A friction pad returning structure for a vehicle disk brake, wherein the friction pad is supported by the outer receiving piece. 2. A pair of caliper support arms extending in the axial direction of the disk over the outside of the disk rotor are provided on a caliper bracket fixedly mounted on a vehicle body, and pad guide portions are provided on both of the caliper support arms so as to face each other. A disc brake for a vehicle in which ear pieces project from both sides of a back plate of a friction pad disposed with a disk rotor interposed therebetween, and the ear pieces are supported on the pad guide part via a pad retainer, The disk radially outer surface and the disk radially innermost surface of the friction pad are inclined so as to gradually move away from the disk axis in a direction opposite to the disk rotor, and the pad retainer has an outer receiving piece parallel to the disk axis. And a pad elastic piece are formed, and the pad elastic piece is brought into contact with the radially innermost surface of the friction pad in the disk radial direction, and A friction pad return structure for a vehicle disk brake, wherein an outer surface in a radial direction of the brake is supported by the outer receiving piece.