JPS5922347Y2 - Brake noise prevention device for disc brakes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing unpleasant braking noise caused by frictional vibration of a friction pad due to sliding contact with a brake disk during braking in a brake.

A brake noise prevention device that has been widely used in the past includes interposing a shim plate having a different natural frequency from the back metal between the back metal of the friction pad and a pressing member such as a piston that presses the back metal. Some shim plates suppress friction pad vibration and brake caliper resonance to prevent braking noise, but in reality, even these do not provide a satisfactory soundproofing effect. By the way.

One of the reasons for this is that it is difficult for the shim plate to suppress vibrations at the end of the backing metal of the friction pad, so the vibration at that end is transmitted to the support member that slidably supports the backing metal of the friction pad. can be mentioned.

Therefore, the present invention is designed to further absorb vibrations at the end of the backing metal of the friction pad and prevent the vibration from being transmitted to the supporting member of the backing metal. It is an object of the present invention to provide the above-mentioned device that does not cause a rubbing phenomenon.

The present invention also includes a brake disc, a pair of friction pads disposed on both sides of the brake disc, and a support portion that supports each end of these friction pads so as to be slidable in the direction of the rotational axis of the brake disc. , a brake caliper configured to press the rear surface of each intermediate portion of the friction pad toward the brake disk, and a shim plate having a natural frequency different from that of the back metal is attached to the back surface of the back metal of the friction pad. In the disk brake, the intermediate portions of the backing metal and the shim plate are brought into close contact with each other, and a groove opening toward the support portion is formed between the end portions of the backing metal and the shim plate, and the groove is provided with the groove. It is characterized in that an elastic member is attached to the support part in a compressed state.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. The illustrated example is an automobile disc brake, and the wheel (
A bracket 1-B supporting a brake caliper C is disposed adjacent to one side of the brake disc D, which rotates with the brake disc D (not shown).

This bracket B is fixed to the vehicle body (not shown) using the mounting holes 1, 1 at the bottom.

Bracket) B has two arm parts 2, 2 lined up at a constant interval in the rotational direction of the brake disc D, and these arms have an inverted U-shape at the tip so as to straddle the outer circumference of the brake disc D from left to right. It is bent (Fig. 3).

Two pairs of rectangular guide rails 3, 3; 3' are arranged on opposing surfaces of both arm portions 2, 2 and sandwich the brake disk D.
, 3' are integrally protruded, and these guide rails 3
．． 3; Between each of 3' and 3', brake disc D
A pair of friction pads P are arranged on both sides of the brake disk P, and the backing metals 4, 4 of P are slidably inserted in the direction of the rotational axis of the brake disk D, and the ears 4a at both ends of the backing metals 4, 4 are inserted.
4a on the upper surface of the corresponding guide rail.

A shim plate 5 made of a steel plate or the like having a different natural frequency from the friction pad P is closely attached to the back of the intermediate portion of each back metal 4, and the attachment is done by caulking as usual.
Use means such as welding.

Both ends 5a of the shim plate 5 face the guide rails.

5a are bent so as to separate from the back metal 4,
A concave groove 6°6 is formed between each end of the shim plate 5 and the back metal 4,
These grooves 6, 6 are filled with elastic members 7, 7 made of rubber, synthetic resin, etc.
attached by molding, filling, inserting, or other means.

Each elastic member 7 is formed so that its surface slightly protrudes outward from the end face of the back metal 4 in its free state, and therefore, the elastic member 7 normally comes into contact with the end face of the corresponding guide rail in a compressed state. ing.

The brake caliper C has first and second arm portions 80, 8□ that straddle both the friction pads P, P on the left and right, and the first arm portion 8 is equipped with a known brake mask cylinder operated by a brake pedal. (not shown), and a piston 10 that presses the middle part of the back surface of one of the friction pads P is slid therein.

On the other hand, the second arm portion 8□ is brought into contact with the back of the other friction pad P.

In addition, the first arm portion 8 has ear portions 11° 11 at both its front and rear ends.
are provided protrudingly, and sliding pins 12 and 12 parallel to the axis of rotation of the brake disk D are fixed to these with bolts 13 and 13, and correspondingly both arms 2 of the bracket H are attached.
, 2. The sliding pin 12 is inserted into the support hole 14.14 provided at the upper end of the 2.
．． 12 is slidably inserted.

Next, to explain the operation of this embodiment, when pressure oil is supplied from a brake mask cylinder (not shown) to the hydraulic cylinder 9 by operating the brake pedal, the piston 10, which moves forward due to the oil pressure, moves to one side via the shim plate 5. The friction pad P is pressed against one side of the brake disk D, and at the same time, the reaction force causes the brake caliper C to slide against the piston 10 while sliding the sliding pin 12.12 into the support hole 14.14. direction, the second arm 8□ pushes the other friction pad P through the shim plate 5 and presses it against the other side of the brake disc D, thus causing the pair of friction pads P, P to act as a brake. It rubs equally on both sides of the disk D to stop its rotation.

During this time, the braking torque that the friction pads P, P receive from the brake disc D is received by the guide rails 3, 3' located on the rotational direction side of the brake disc D.

Therefore, if each friction pad P generates vibration due to sliding friction with the brake disc D, the vibration is suppressed by the shim plate 5 which is in close contact with the back surface of the friction pad P and has a different natural frequency from the shim plate 5. At the same time, the end of the back metal 4, the end of the shim plate 5, and the guide rails 3, 3; 3',
The elastic members 7 that engage with the three members 3' absorb vibrations of the friction pad P, particularly at the ends, and also promote the vibration suppressing effect of the shim plate 5.

Therefore, the vibrations of the friction pads P, P are prevented from being transmitted to the brake caliper C and the bracket (B), and their resonance phenomenon is prevented.

Furthermore, when the elastic member 7 is subjected to braking torque, it compressively deforms so as to escape into the groove 6, so it is not subjected to excessive compressive load and has high durability.

The present invention can also be applied to a type of disc brake in which the bracket B in the above embodiment is omitted by directly supporting the pair of friction pads P, P on both arms 8□, 8□ of the brake caliper C. In this case, it goes without saying that the elastic members 7, 7 are brought into contact with the pad support portion of the brake caliper C.

As described above, according to the present invention, the brake disk and
a pair of friction pads disposed on both sides of the brake tooth disk; a support portion that supports each end of the friction pads so as to be slidable in the direction of the rotational axis of the brake tooth disk;
A brake caliper configured to press the back surface of each intermediate portion of the friction pad toward the brake task disk, and a shim plate having a different natural frequency from the back metal attached to the back surface of the back metal of the friction pad. In the brake, while the middle parts of the backing metal and the shim plate are brought into close contact with each other, a groove is formed between each end of the backing metal and the shim plate, and the groove is opened toward the supporting part. Since the elastic member that contacts the support part in a compressed state is attached, when the friction pad generates frictional vibration due to sliding contact with the brake disc during braking, vibrations are generated from the shim plate that is in close contact with the back surface of the pad and which has a different natural frequency. The elastic member acts to suppress the frictional vibrations, and at the same time elastically engages with the end of the back metal, the end of the shim plate, and the pad support. It is possible to effectively absorb and attenuate vibrations to promote the vibration suppressing effect of the shim plate, thereby significantly reducing the vibrations of the entire friction pad, and transmitting the vibrations to supporting parts such as brackets. can effectively suppress the resonance phenomenon of the support part,
It is possible to suppress the generation of unpleasant braking noise.

In particular, while the middle parts of the pad back metal and the shim plate are brought into close contact with each other, grooves for attaching the elastic member are formed between the ends of the back metal and the shim plate. Although the elastic member is interposed, the strong braking force applied to the pad back metal by the brake caliper through the middle part of the shim plate does not act on the elastic member, and therefore the elastic member is not subject to excessive compression. It is highly durable as it does not receive loads, and the relative distance in the axial direction between the pad backing metal and the shim plate can be kept constant at all times due to the fact that their middle parts are in close contact with each other. It is possible to prevent the so-called rubbing phenomenon of the friction pad from occurring.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of a disc brake equipped with the device of the present invention, and Figs. 2 and 3 are II of Fig. 1.
-II line and III-III line sectional view. 4...Backing metal, 5...Shim board, 5a...
・・・The end part, 6... Concave groove, 7...
- Elastic member, B... Bracket as a support part, C... Brake caliper, D... Brake disc, P... Friction pad.

Claims (1)

[Scope of utility model registration request] A brake disc, a pair of friction pads disposed on both sides of the brake disc, a support part that supports each end of these friction pads so as to be slidable in the direction of the rotational axis of the brake disc, and The brake caliper is provided with a brake caliper configured to press a rear surface of each intermediate portion toward the brake disc, and a shim plate having a natural frequency different from that of the back metal is attached to the back of the back metal of the friction pad. While the intermediate portions of the backing metal and the shim plate are brought into close contact with each other, a groove opening toward the supporting portion is formed between each end of the backing metal and the shim plate, and the supporting portion is compressed into this groove. A braking noise prevention device for disc brakes, which is equipped with an elastic member that comes into contact with the brake.