JPH08312697A - Shim for disc brake - Google Patents

Abstract

PURPOSE: To prevent lowering of an effect to reduce the generation of noise during brake. CONSTITUTION: A shim 20 comprises a metallic sheet 22; and a low friction sheet 24. The low friction sheet 24 is a composite substance of a low friction resin 26, such as fluorine resin, and a metallic mesh 28 and has a friction factor lower than a friction factor being a middle between the friction factor of the back metal 14 of a friction pad 10 and that of the metallic sheet 22, and disposed between the back metal 14 and the metallic sheet 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake shim for preventing the generation of noise between a friction pad backing and a pressing member that presses the pad against the rotor, which is generated during braking of the disc brake.

[0002]

2. Description of the Related Art In a disc brake, friction pads arranged on both sides of a rotor are pressed and held against a rotor surface by a hydraulic device or the like to obtain a braking force. The friction pad is composed of a friction material and a back metal that holds the friction material, and the back surface of the back metal is pressed by a pressing member such as a metal caliper claw or piston so that the friction material comes into pressure contact with the rotor surface. It has become. However, when the friction pad is brought into pressure contact with the rotating rotor, the friction pad moves in the circumferential direction of the rotor together with the rotor, and the pressing member that presses the back metal is pulled by the friction pad and shakes, and noise due to vibration thereof is generated. Therefore, Japanese Utility Model Publication No. 1-33871 proposes a shim for preventing the generation of noise due to the shake of the pressing member.

The shim described in Japanese Utility Model Publication No. 1-33871 is made up of a stainless steel thin plate and a metal thin plate whose entire surface is coated with rubber and whose surface is coated with grease. The rubber coated metal thin plate is rubbed. The stainless steel thin plate is attached to the friction pad by being sandwiched between the back metal of the pad and the stainless steel thin plate.

[0004]

However, the above-mentioned fairness 1
The shim described in Japanese Patent No. 33871 may run out of grease after being used for a long period of time, and the effect of preventing the generation of noise due to the shake of the pressing member may be reduced, and the effect of reducing noise during braking may be reduced. Further, the shim described in Japanese Utility Model Publication No. 1-33871 requires that the surface of the thin metal plate be coated with rubber, and that the surface of the rubber be coated with grease, which increases the number of steps and increases the cost.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and provides a disc brake shim capable of preventing a reduction in noise reduction effect during braking even after long-term use. It is an object.

[0006]

In order to achieve the above object, a disc brake shim according to the present invention comprises a friction pad backing of a disc brake for pressing a friction pad against a rotor by a pressing member and the pressing member. A shim that is interposed between the metal plate attached to the friction pad backing plate and the metal plate placed between the metal plate and the backing plate, and has a friction coefficient smaller than the friction coefficient between the metal plate and the backing plate. And a low friction sheet. As the low-friction sheet, a resin having a low friction coefficient such as a fluororesin or a metal thin plate having a surface coated with a resin having a low friction coefficient such as a fluororesin can be used. The resin sheet is a metal mesh made of stainless steel or bronze, metal whiskers (whisker crystals), inorganic fibers such as glass fibers, carbon fibers or metal fibers, organic fibers such as aramid fibers, and these fibers in a cross shape. It is recommended to combine it with a reinforcing material such as the above.

[0007]

According to the present invention constructed as described above, since the low friction sheet disposed between the backing plate of the friction pad and the metal plate has a smaller coefficient of friction between them, the friction pad is pressed against the rotor by the pressing member. When braking, a smooth slip is generated between the backing of the friction pad and the low friction sheet, the pressing member that presses the friction pad is prevented from shaking, and noise due to shaking of the pressing member can be prevented. Can be reduced. Moreover, since the sheet itself has low friction, the performance does not deteriorate even after long-term use, and the noise reduction effect can be prevented from decreasing.
In particular, when the low-friction sheet is made of a resin such as fluorine, it is possible to obtain the noise damping effect of the resin itself as in the case of using the rubber sheet, and the noise can be further reduced. When the resin is combined with the reinforcing material, the low-friction sheet can be prevented from cracking even if a large compressive force is applied during braking.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a disc brake shim according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing a disc brake shim according to an embodiment of the present invention and a partial sectional view of a low friction sheet.

In FIG. 1 (1), the friction pad 10 is
It comprises a friction material 12 and a back metal 14. Friction material 12
Is attached to the front side (left side in FIG. 1A) of the backing metal 14 facing the rotor (not shown). And back metal 14
On both sides in the circumferential direction of the rotor, projections 16 for guiding and moving the friction pad 10 in the axial direction of the rotor are formed to project. The projections 16 are formed on a support (not shown) fixed to the vehicle body. The friction member 12 is fitted in the guide groove and is pressed and moved in the axial direction of the rotor by a caliper claw which is a pressing member provided on a caliper (not shown) or a piston of a hydraulic device, so that the friction material 12 is pressed against the rotor surface. There is.

A shim 20 is provided on the back side of the back metal 14. The shim 20 is composed of a metal plate 22 which is brought into contact with and pressed by a pressing member, and a low friction sheet 24 which is arranged between the metal plate 22 and the back metal 14. This low-friction sheet 24 has a back metal 14 as shown in the cross section of FIG.
A resin 26 such as a fluororesin having a coefficient of friction smaller than that between the metal plate 22 and the metal plate 22;
It has a structure in which a metal mesh (reinforcing material) 28 made of stainless steel, bronze, or the like, which is arranged inside, is combined. The metal plate 22 and the low friction sheet 24 are formed in substantially the same shape as the back metal 14. Further, claws 30 for attaching the shim 20 to the friction pad 10 are provided at appropriate upper and lower portions of the metal plate 22. Further, the back metal 14 and the low-friction sheet 24 are formed with grooves 32 and 34 for receiving the claws 30 corresponding to the claws 30 provided on the metal plate 22.
Then, by hooking the claw 30 of the metal plate 22 on the back metal 14, the friction pad 10 and the shim 20 can be integrated while the low friction sheet 24 is sandwiched between the back metal 14 and the metal plate 22. ing.

In the embodiment constructed as described above, when the friction pad 10 is pressed against the rotor by the piston of the hydraulic cylinder provided in the caliper or the caliper claw to perform the braking action, the back metal 14 and the shim 20 of the friction pad 10 are used. There is no slippage between the low friction sheet 24 and the low friction sheet 24 and the pressing member for pressing the friction pad is not shaken. It is possible to prevent the generation of noise due to the shake of the pressing member and reduce the generation of noise during braking. . Moreover, in the embodiment, since the resin sheet made of fluorine resin or the like having a small friction coefficient is used, not only the backing metal 14 and the low friction sheet 24 are smoothly slid but also noise is generated by the resin 26. It can be attenuated and the noise can be made smaller. Further, in the embodiment, since it is not necessary to apply grease unlike the conventional shim, the grease applying step can be omitted and the cost can be reduced. In addition, in the embodiment, since the low friction sheet 24 is a composite of the resin 26 and the metal mesh 28, even if a large pressing force is applied during braking, cracking does not occur and it can withstand long-term use. You can

FIG. 2 shows a cross section of another embodiment of the low friction sheet. The low-friction sheet 24 shown in FIG. 2 (1) has a structure in which glass fibers 36 are dispersed in a low-friction resin 26 such as a fluororesin to be integrated. The low-friction sheet 24 configured in this way can also obtain the same effect as that of the above-described embodiment. It should be noted that, instead of the glass fiber 36, an inorganic fiber such as carbon fiber or metal fiber, an organic fiber such as aramid fiber, or a cloth in which these fibers are crossed,
You may use a metal whisker etc. as a reinforcing material.

The low friction sheet 2 shown in FIG.
4 has a structure in which a low friction resin 26 such as a fluororesin is coated on both surfaces of a thin metal plate 38 such as stainless steel. Also in the low friction sheet 24 of this embodiment, the same effect as that of the above embodiment can be obtained. The thin metal plate 38 may be so-called punching metal provided with a large number of holes.

[0014]

As described above, according to the present invention, since the low friction sheet disposed between the backing plate of the friction pad and the metal plate has a smaller coefficient of friction between them, the friction pad is pressed by the pressing member. When the brake is pressed against the rotor by the brake, smooth sliding occurs between the backing of the friction pad and the low-friction sheet, preventing the pressing member that presses the friction pad from moving, and preventing noise from occurring due to the pressing member moving. You can
Generation of noise during braking can be reduced. Moreover, since the sheet itself has low friction, there is no deterioration in performance even after long-term use, and it is possible to prevent deterioration in the noise reduction effect. In particular, when the low-friction sheet is made of a resin such as fluorine, the resin itself has an effect of attenuating the noise, and the noise can be further reduced. When the resin is combined with the reinforcing material, the low-friction sheet can be prevented from cracking even if a large compressive force is applied during braking.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a part of a shim and a partial sectional view of a low friction sheet according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of another embodiment of the low friction sheet.

[Explanation of symbols]

 10 Friction Pad 14 Back Metal 20 Shim 22 Metal Plate 24 Low Friction Sheet 26 Resin 28, 36 Reinforcing Material (Metal Mesh, Glass Fiber) 38 Metal Thin Plate

Claims (3)

[Claims] 1. A shim for interposing between a friction pad backing of a disc brake that presses a friction pad against a rotor by a pressing member and the pressing member, and a metal plate attached to the friction pad backing, and this metal plate. And a low friction sheet disposed between the back plate and the metal plate and having a friction coefficient smaller than a friction coefficient between the metal plate and the back plate. 2. The disc brake shim according to claim 1, wherein the low friction sheet is made of resin. 3. The disc brake shim according to claim 2, wherein the low friction sheet is a composite of a resin and a reinforcing material.