JPH06207631A - Inner shim attaching structure in disc brake - Google Patents

Abstract

PURPOSE:To provide a multifunction inner shim capable of restraining generation of noise in braking and in non-braking phase, being assembled easily, and improving the reduction of the number of parts. CONSTITUTION:In a shim to be interposed between the inner pad 50 and the piston of a disk brake, an anti-rattle part 62 formed on the main body part 61 of the shim 60 is interposed between the torque receiving part of a carrier and the torque transmitting part 53 of the inner pad 50, and at least one lengthened part 63 extended outward from the upper part of the shim main body part 61 is brought in elastically contact with the inner surface of the carrier, thereby the torque receiving part of the carrier and the torque transmitting part 53 of the inner pad 50 are elastically supported. Moreover a holding part 64 formed on the main body part 61 of the inner shim 60 is engaged with a groove on the piston top end and elastically attached thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shim structure for mounting an inner shim in a disc brake.

[0002]

2. Description of the Related Art In a disc brake, a shim inserted between a piston in a cylinder hole formed in a caliper and a back metal of an inner pad facing the caliper cannot have any other function added to the original function of the shim. Are known. For example, in JP-A-57-167538, an impact damping piece is formed integrally with a shim to prevent impact noise between a torque receiving portion of a carrier and a torque transmitting portion of a friction pad, which is generated during braking. It is disclosed. It is also known that, for example, a wear warning piece is formed integrally with a shim, and when the friction material of the friction pad reaches the wear limit, the wear warning piece that abuts the rotor vibrates to notify the friction pad replacement time. There is.

[0003]

The above-mentioned conventional shim has the following problems.

<a> In the shim integrally formed with the shock-damping piece, the friction pad is not restricted in the rotor circumferential surface direction when the brake is not applied, so that the rattle noise accompanying the vibration of the vehicle is surely generated. Cannot be prevented. In addition to requiring a separate elastic grip to press the friction pad toward the center of the rotor, the elastic claw formed on the shim for attaching to the back metal of the friction pad exerts unreasonable force and deforms the elastic claw. It may be broken or damaged.

<B> When assembling the caliper or replacing the pad, there was no shim having a holding portion or the like that can be mounted on the pad with one touch by rotating the caliper with one guide pin supporting the caliper as a fulcrum. .

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an inner shim mounting structure for the following disc brake. Inner shim mounting structure for disc brakes that can suppress the generation of noise during braking. Inner shim mounting structure for disc brakes that can be easily mounted on friction pads. Inner shim mounting structure for disc brakes that prevents friction pad dragging when the brakes are released. Inner shim mounting structure for disc brakes that reduces the number of components.

[0007]

According to the present invention, a caliper that straddles a part of the outer circumference of a disk rotor is slidably arranged in a rotor axial direction on a carrier fixed to a non-rotating member of a vehicle by a pair of guide pins. Between the pistons in the cylinder hole formed in the caliper and the inner pad backing metal facing the pistons, by engaging both ends of the pair of friction pads in the circumferential direction with the carrier in a state of allowing sliding in the rotor axial direction. In a disc brake having a shim inserted in, from the body portion of the shim attached to the back surface of the inner pad backing metal,
At least one of the anti-rattle parts extending from both ends in the circumferential direction to form an anti-rattle part interposed between the torque receiving part of the carrier and the torque transmitting part of the friction pad is provided to extend outward from the upper part of the shim body part. By elastically contacting the extension portion with the inner surface of the caliper, the inner pad is elastically supported by the torque receiving portion of the carrier, and the piston passes when the caliper is rotated with one of the pair of guide pins as a fulcrum. The inner shim mounting structure in the disc brake is characterized in that a holding portion is formed to allow a portion of the shim body portion to be cut and raised toward the piston side and to engage with the groove at the piston tip. .

[0008]

【Example】

<A> Overall Structure of Disc Brake FIG. 2 shows a plan view of the disc brake, and FIG. 3 shows a central sectional view of the disc brake. The carrier 10 has torque receiving portions 11, 11 formed at both ends thereof, and is fixed to a non-rotating member (not shown) of the vehicle. The caliper 20 includes a hydraulic pressure actuating unit 21 and a reaction unit 22 which is located across the disc rotor A so as to face the hydraulic pressure actuating unit 21.
And a mechanical actuating device part 23 located behind the hydraulic actuating device part 21. The caliper 20 is supported by a pair of guide pins 30 and 31 fixed to the torque receiving portions 11 and 11 of the carrier 10. A piston 32 is slidably fitted in a cylinder hole 24 formed in the caliper 20 to form a hydraulic operating unit 21. Piston 3
A pair of friction pads 40 and 50 that press the both side surfaces of the rotor A by means of 2 and the reaction portion 22 for braking allow sliding between the torque receiving portions 11 and 11 of the carrier 10 in the axial direction of the rotor A. It is placed in a horizontal position. Inner pad 5
An inner shim 60, which will be described later, is provided between 0 and the piston 32.
Has been inserted.

<B> Inner Shim As shown in FIGS. 1 and 4, the inner shim 60 includes a main body 61 having substantially the same shape as the back metal 51 of the inner pad 50, and a carrier extending from the main body 61 at both circumferential ends. A pair of anti-rattle parts 62, 62 inserted between the torque receiving parts 11, 11 of 10 and the concave torque transmitting parts 53, 53 of the inner pad 50, and extending outward from the upper part of the main body part 61. The extended portions 63, 63 and a part of the main body portion 61 are attached to the piston 32.
Holding portions 64, 64 that are cut and raised to the side to engage with the groove 33 at the tip of the piston 32, and a wear warning piece 6 that is bent toward the rotor A side from the main body portion 61 and extends to the wear limit position of the friction material 52.
It consists of 5,65. The main body 61 is attached to the back surface of the inner pad 50 backing metal 51 by various methods. As an example thereof, a connecting claw 67 bent from the main body portion 61 toward the pad 50 side in a substantially L shape is elastically contacted with the side surface of the pad 50, and the connecting holes 68, 68 formed at appropriate positions of the main body portion 61 are backed. The projections 54, 54 projecting from 51 are inserted, and the projections 54, 54 are caulked and fixed. In addition to the above, the mounting means of the inner shim 60 may be a plurality of connecting claws only, or may be only caulked and fixed by a protrusion, or may be attached so as to be movable relative to the back metal of the pad. The anti-rattle section 62 is
Hanging part 62a along the torque receiving portion 11 of the carrier 10.
And below the hanging part 62a, the hanging part 62a and the main body 6
1 and an upper surface portion 62c which is bent above the hanging portion 62a and contacts the upper surface of the torque receiving portion 11, and the tip of the extension portion 63 is elastically contacted with the inner surface of the caliper 20. By doing so, the pad 5 to which the shim 60 is attached
0 is pushed downward, and the anti-rattle portion 62 is tilted in the circumferential direction of the rotor A with the contact point between the torque receiving portion 11 and the hanging portion 62a as a fulcrum. Although a pair of extension portions 63 are formed on both sides in the present embodiment, they may be provided at one location in the center or at three locations or more. The holding parts 64 and 64 are provided with the inner shim 60 and the piston 32.
It is a portion for engaging with the groove 33 at the tip, and is formed by cutting and raising a part of the main body 61 toward the piston 32 side.
In the present embodiment, the case where the pair of holding portions 64, 64 are formed in an arc shape will be described. Any shape may be used as long as it allows passage of the piston groove 33 when the caliper 20 is rotated around the fulcrum and can engage with the groove 33 at the tip of the piston 32. Reference numeral 34 indicated by a chain double-dashed line in FIG. 4 is, for example, one guide pin 3 in FIG.
Piston 3 when the caliper 20 is rotated about 0 as a fulcrum
The locus of 2 is shown. Further, as shown in FIG. 7, the piston groove 33 is formed such that the tip end side thereof is tapered to facilitate the accommodation of the holding portion 64, and the holding portion 64 can be elastically attached along the tapered surface. As shown in FIG. 6, the wear warning piece 6
5 is formed by bending from the body portion 61 to the rotor A side,
The warning sound becomes clearer when the loop 65a is formed from the main body portion 61 to the side opposite to the rotor and extended to the wear limit position.

[0011]

[Action]

<A> Assembly operation of inner shim The inner shim 60 has a connecting claw 67 at the upper center of the main body 61.
Is elastically contacted with the side surface of the pad 50, the connecting holes 68, 68 of the main body 61 are fitted into the protrusions 54, 54 of the backing plate 51, and the protrusions 54, 54 are caulked to be attached to the backing plate 51. The inner pad 50 carries and moves with the inner shim 60 attached.

<B> Assembling the caliper When assembling the caliper 20 or replacing the pad,
The pinton 32 in the cylinder hole 24 formed in the caliper 20 is moved to the inner shim 6 only by rotating the caliper 20 around the one guide pin 30 that supports the caliper 20.
Holding portions 64, 64 formed by cutting and raising the body portion 61 of 0.
You can move in and out freely.

<C> During non-braking The inner shim 60 assembled to the disc brake has the extension portion 63 whose tip tip elastically contacts the inner surface of the caliper 20.
The entire inner pad 50 is pushed downward to tilt the anti-rattle parts 62, 62 in the rotor A circumferential direction. Therefore, the caliper 20 and the inner pad 50 caused by the vibration of the vehicle
The rattle noise can be effectively prevented.

<D> During Braking When braking is performed when the vehicle moves forward or backward, the pads 40 and 50 are pressed against the rotating rotor A, and the rotation of the rotor A is braked by the frictional resistance. At this time, the anti-rattle portion 62 of the inner shim 60, which is mounted on the torque transmission portion 53 of the inner pad 50, has the torque receiving portion 11 of the carrier 10.
Slide smoothly. Normally, a shim is made of a stainless steel plate in order to have anti-rust property and spring property, so that the sliding part is also prevented from being rusted. Further, during braking, as shown in FIG. 5, the torque transmission portion 53 of the inner pad 50 and the inner shim 60 are
Since a gap is formed between the anti-rattle parts 62, the inner pad 50 moves in a direction to eliminate the gap while deforming the anti-rattle part 62. As a result, the torque transmission portion 53 of the inner pad 50 becomes
Collision noise at the time of collision with the torque receiving portion 11 of 0 is prevented. When the braking is released, the holding portion 6 of the inner shim 60 is released.
Since the inner pad 50 is elastically attached to the piston 32 at 4, the inner pad 50 is reliably separated from the rotor A, and dragging or the like is prevented.

[0016]

Since the present invention is as described above, the following effects can be obtained.

<B> Since the body of the inner shim attenuates the vibration of the pad due to braking and transmits it to the piston,
Squeaking and judder can be prevented.

<B> Since the anti-rattle part is inserted between the torque receiving part of the carrier and the torque transmitting part of the friction pad, the sliding of the pad in the axial direction becomes smooth, and the rust of the sliding part is rusted. It can also prevent sticking.

<C> By elastically contacting the tip of the extension with the inner surface of the caliper, the entire pad to which the shim is attached is pushed downward, and the anti-rattle portion is tilted in the rotor circumferential direction. It is possible to prevent the generated shock noise between the torque receiving portion of the carrier and the torque transmitting portion of the pad, and also to prevent the rattle noise during non-braking.

<D> Since the inner pad is locked to the piston by the holding portion, the inner pad can be reliably separated from the rotor when the brake is released, and drag and the like can be prevented. or,
When the caliper is assembled, or when the pad is replaced by rotating the caliper with one guide pin as a fulcrum and assembled, the holding portion can be attached to the piston with one touch. Furthermore,
It is possible to prevent the inner pad from falling off due to vibration caused by transportation before assembling to the vehicle.

<E> When the friction material reaches the wear limit, the tip of the wear warning piece comes into contact with the rotating rotor.
A sliding noise is emitted to warn the wear limit.

<F> By integrating the shims having these functions, the number of parts is reduced, and it is possible to prevent forgetting to assemble parts having each function, erroneous assembly, falling out, etc., and improve the assembling property. .

[Brief description of drawings]

1] Assembly drawing of inner shim and inner pad

FIG. 2 is a plan view of the disc brake.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a rear view of the inner pad as viewed from the side of the caliper hydraulic actuator.

FIG. 5 is a partially enlarged view of the inner pad.

6 is a sectional view of VI-VI in FIG.

7 is a sectional view taken along line VII-VII in FIG.

Claims (3)

[Claims] 1. A carrier fixed to a non-rotating member of a vehicle is provided with a caliper straddling a part of the outer circumference of a disk rotor so as to be slidable in a rotor axial direction by a pair of guide pins, and a pair of frictions is provided on the carrier. A disk having a shim inserted between a piston in a cylinder hole formed in the caliper and an inner pad back metal facing the piston, by engaging both ends of the pad in the circumferential direction in a state of allowing sliding in the axial direction of the rotor. In the brake, an anti-rattle that extends from the main body of the shim attached to the back surface of the inner pad backing to both ends in the circumferential direction and is interposed between the torque receiving portion of the carrier and the torque transmitting portion of the friction pad. At least one part that extends outward from the upper part of the shim body part
By elastically contacting the two extension parts with the inner surface of the caliper,
The inner pad is elastically supported by the torque receiving portion of the carrier, and the piston is allowed to pass when the caliper is rotated about one of the pair of guide pins as a fulcrum. An inner shim mounting structure for a disc brake, characterized in that a holding portion is formed by cutting and raising a part of the piston toward the piston and engaging with a groove at the tip of the piston. 2. The anti-rattle part of the shim has a hanging part along the torque receiving part of the carrier, a lower surface part connecting the hanging part and the shim body part below the hanging part, and an upper part of the hanging part. The inner shim mounting structure for a disc brake according to claim 1, further comprising: 3. The at least one wear warning piece extending from the main body of the shim to the rotor side so as to extend to the wear limit position of the friction material is formed. Inner shim mounting structure for disc brakes.