JP2001336555A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake capable of preventing clonking sound with a simple structure and maintaining clonking sound preventive effect over the long term. SOLUTION: An anti-squeal part 7a abutting on a pad back plate 6 and pressed by a piston 10 and an anti-clonk part 7b provided between the pad back plate 6 and a torque receiving surface 3aa, producing resilient force by deformation caused by approach of the pad back plate 6 to a torque receiving surface 3aa are provided in a shim 7 arranged between the pad back plate 6 and the piston 10.

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 as a vehicle wheel brake.

[0002]

2. Description of the Related Art In a disk brake used as a wheel brake of a vehicle, a pad back plate and a non-rotating portion of a vehicle body are provided for the purpose of absorbing a manufacturing error and preventing the pad from being twisted in a thickness direction. 1 mm between the torque receiving member provided and receiving the braking torque via the pad back plate.
A weak gap is provided. For this reason, the pad back plate abuts against the torque receiving member at the time of braking, and an abutment sound called a so-called clonting sound (clicking sound) is generated, which gives the driver discomfort.

For this reason, an anti-squeal shim provided between the pad back plate and the piston and having substantially the same shape as the pad back plate for preventing brake squeal is extended to the torque receiving member side and is wrapped around. Function as a cushioning member against the contact between the pad back plate and the torque receiving member,
A method for reducing the impact sound has been proposed (Japanese Patent Laid-Open No. 8-1).
35699).

[0004]

It is said that minute vibrations in the direction of rotation of the disk rotor that occur between the disk rotor and the pad lining during braking are the causes of brake squeal. The anti-squeal shim is provided with a rubber coating over the entire contact surface with the pad back plate and the contact surface with the piston.

[0005] Therefore, in the configuration as in the prior art described above, in which the anti-squeal shim is extended to the torque receiving member side and wrapped around to provide a cushioning member against an abutment between the pad back plate and the torque receiving member, the braking is repeated. In addition, due to the contact between the pad back plate and the anti-squeal shim (cushioning member) or the contact between the torque receiving member and the anti-squeal shim (cushioning member), the coated rubber is peeled off in a short time, and the cushioning effect is reduced. It will be spoiled in a short time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is a technical object of the present invention to provide a disk brake which can prevent a cronk sound with a simple structure and can maintain a clonk sound prevention effect for a long period of time. It is assumed that.

[0007]

According to a first aspect of the present invention, there is provided a disk rotor rotating integrally with a wheel, a pad lining pressed against the disk rotor, and the pad lining. A pad comprising a pad back plate for holding, a piston for pressing the pad toward the disk rotor, a shim disposed between the pad back plate and the piston, and a housing for accommodating the piston. A disc brake comprising: a caliper having a cylinder bore; and a torque receiving member provided on a non-rotating portion of the vehicle body and receiving a braking torque generated by sliding contact between the pad and a disk rotor via the pad. An anti-squeal portion that abuts against the pad back plate and is pressed by the piston; A disc brake provided between the pad and the torque receiving member, and an anti-cronk portion that generates a resilient force by deformation of the pad due to approach to the torque receiving member. did.

According to the first aspect of the present invention, an anti-cronk portion is provided by extending a part of the shim to extend between the pad back plate and the torque receiving member to provide an anti-cronk portion, and the shim is pressed by the pad back plate and the torque receiving member. A spring action is provided on the anti-cronk portion so as to generate a repelling force when performed. According to this configuration, the sudden contact of the pad back plate with the torque receiving member due to the sliding contact between the pad and the disk rotor during braking is reduced by the spring action of the anti-cronk portion,
The generation of the clonk noise is prevented. Also, due to the spring action, the contact between the pad back plate and the anti-cronk portion and the contact between the torque receiving member and the anti-cronk portion are performed after absorbing the impact energy due to the elastic deformation of the anti-cronk portion. Damage to the applied rubber is small, the rubber is hardly peeled off from the shim, and the anti-clonk noise preventing effect of the anti-cron portion is maintained for a long period of time.

Next, as set forth in claim 2, the pad back plate has a first contact portion for transmitting the braking torque to the torque receiving member via the anti-cronk portion, and the torque receiving member. And a second abutting portion that directly abuts on the shaft to transmit the braking torque to the torque receiving member.

In the invention according to claim 2, a portion of the pad back plate facing the torque receiving member has a first contact portion for transmitting a braking torque via an anti-cronk portion of the shim, and a torque receiving member for braking. And a second contact portion for directly transmitting the braking torque by directly contacting the second contact portion. According to this configuration, the sudden contact of the pad back plate with the torque receiving member in the initial stage of braking is alleviated by the spring action of the anti-cronk portion, thereby preventing the generation of a cronk sound and at the same time, the braking is continued and the anti-cronk is continued. After the portion has been elastically deformed by a predetermined amount, the braking torque is received by the contact between the first contact portion and the torque receiving member, so that a force of a predetermined value or more is not applied to the anti-cronk portion. Therefore, the durability of the anti-cronk portion is improved, and the period during which the effect of preventing the clonk noise is exerted is significantly increased.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments.

FIG. 1 to FIG. 3 show a first embodiment according to the present invention. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a projection view of FIG. 2 viewed from below. 1 to 3, a disc brake 1 sandwiches a disc rotor 2 inside a caliper 3 disposed so as to straddle the outside of the disc rotor 2 and a disc rotor 2 that rotates integrally with a wheel (not shown). A pair of pads 4 that are opposed to each other
It is composed of

The caliper 3 is formed by integrally connecting two divided pieces 3a divided outside the disk rotor 2 by connecting bolts (not shown).

A cylinder bore 9 is opposed to the divided piece 3a of the caliper 3 with the disk rotor 2 interposed therebetween. A piston 10 is accommodated in the cylinder bore 9 via a seal 11 so as to be liquid-tight and movable, and a hydraulic chamber 12 is formed between the bottom of the cylinder bore 9 and the piston 10.

The pad 4 is formed by joining a pad lining 5 to a pad back plate 6. The pad back plate 6 is in contact with a piston 10 in the caliper 3 via a shim 7. The pad 4 is suspended by positioning pins 14 inserted into pin holes provided in the pad back plate 6 so that the disk rotor 2 can move in the axial direction. In order to prevent the pad back plate 6 from interfering with the caliper 3 due to a manufacturing error, an assembly error, etc., a predetermined space is provided between the side surface 6a of the pad back plate 6 and the torque receiving surface 3aa of the caliper 3. A gap X is provided.

As shown in FIG. 2 and FIG.
The anti-squeal portion 7a is in contact with most of the back surface 6c of the pad back plate 6 at the anti-squeal portion 7a, and is extended so that the anti-cronk portion 7b goes around the side surface 6a of the pad back plate 6. As shown in FIG. 3, the anti-cronk portion 7 b is formed into a curved leaf spring shape, and contacts the side surface 6 a of the pad back plate 6 at only one point.

In order to attenuate minute vibrations in the rotational direction of the disk rotor 2 generated between the disk rotor 2 and the pad lining 5 during braking, the shim 7 is coated with a rubber coating over the entire surface including the anti-cronk portion 7b. Have been. Therefore, a braking operation is performed and the hydraulic pressure chamber 12
When hydraulic pressure is generated, the transmission of the force generated by the hydraulic pressure is performed by the piston 10, the rubber coated on the shim 7, the metal plate constituting the shim 7, the rubber coated on the shim 7, the pad back plate 6, The pad lining 5 and the disk rotor 2 are performed in this order.

That is, when the braking operation is performed, the brake fluid pressurized by a known master cylinder (not shown) is supplied to the hydraulic chamber 12, and the piston 10 presses the shim 7 and the pad back plate 6, As a result, the pad lining 5 presses the disk rotor 2 to generate a braking torque on the wheels.

At this time, the pad lining 5 and, consequently, the pad back plate 6 receive a rotational force indicated by an arrow in FIG. 2 by the braking torque. When the pad back plate 6 receives a rotational force, the side surface 6a of the pad back plate 6 rapidly approaches the torque receiving surface 3aa of the divided piece 3a of the caliper 3 serving as a torque receiving member, and the side surface 6a of the pad back plate 6 comes into contact with the torque. If there is no intervening object between the receiving surface 3aa and the side surface 6a of the pad back plate 6, the torque receiving surface 3aa will come into abutting contact, and a so-called clunk sound (clicking sound) will be generated.

However, according to the first embodiment, since the leaf spring-shaped anti-cronk portion 7b exists between the side surface 6a of the pad back plate 6 and the torque receiving surface 3aa, the torque receiving portion of the pad back plate 6 is not provided. The sudden contact with the surface 3aa is mitigated by the spring action of the anti-cronk portion 7b, and the generation of the clonk noise is prevented. Also, due to the spring action, the contact between the pad back plate 6 and the anti-cronk portion 7b and the contact between the torque receiving surface 3aa and the anti-cronk portion 7b are:
Since the impact energy is absorbed by the elastic deformation of the anti-cronk portion 7b, the rubber coated on the shim 7 is hardly damaged, and the rubber is hardly peeled off from the shim 7. Therefore, the effect of the anti-cronk portion 7 to prevent the clonk noise is maintained for a long time.

Next, a second embodiment according to the present invention will be described with reference to FIG.

In the first embodiment, a rubber-coated plate having a rectangular developed shape is formed by bending both ends of the plate to provide the anti-cronk portion 7b.
Since the anti-cronk portion 7b has a simple shape formed over the entire region in the plate width direction, the degree of freedom in designing the spring constant of the anti-cronk portion 7b is restricted to some extent.

Therefore, in the second embodiment, a notch 7 is provided between the anti-squeal portion 7a and the anti-chrome portion 7b.
By providing c, the shape of the anti-cronk portion 7b,
The dimensions can be set without being affected by the shape and dimensions of the anti-squeal portion 7a. Therefore, the width (length in the depth direction of the paper in FIG. 4) and length (length in the vertical direction in FIG. 4) of the anti-clonk portion 7b can be set irrespective of the shape and dimensions of the anti-squeal portion 7a. It is possible to provide the optimum shape and size of the anti-cronk portion 7b even when the mode of generating the clonk sound changes due to the difference in the specifications.

Next, a third embodiment according to the present invention will be described with reference to FIG.

In the third embodiment, the side surface of the pad back plate 6 is closer to the torque receiving surface 3aa than the first contact portion 6a on which the anti-cronk portion 7b is disposed and the first contact portion 6a. With the torque receiving surface 3aa.
And the contact portion 6b.

According to the structure of the third embodiment, the sudden contact of the pad back plate 6 with the torque receiving surface 3aa at the initial stage of braking is alleviated by the spring action of the anti-cronk portion 7b, and the generation of the clonk noise is prevented. After the braking is continued and the anti-cronk portion 7b is elastically deformed by a predetermined amount due to the continued braking, the braking force is received by the contact between the second contact portion 6b and the torque receiving portion surface 3aa. No force greater than the specified value is applied to. Therefore, the durability of the anti-cronk portion 7b is improved, and the period during which the effect of preventing the clonk noise is exhibited is significantly increased.

Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments, but includes various embodiments according to the principle of the present invention.

In each of the above embodiments, the respective pads 4, 4 are connected to the piston 10,
The principle of the present invention is applied to a so-called opposed cylinder type disc brake which is pressed by 10, but is not limited to this, and is applied to, for example, a single cylinder type (caliper floating type) disc brake. It is also possible.

In each of the above embodiments, the pad 4
The principle of the present invention is applied to a disc brake of a type in which is suspended by a positioning pin 14 inserted into a pin hole provided in a pad back plate 6, but the present invention is not limited to this. For example, the present invention can be applied to a disc brake of a type that receives a braking torque by inserting locking projections provided at both ends of the pad back plate 6 into recesses of a torque receiving member fixed to the vehicle body.

[0030]

According to the present invention, it is possible to provide a disk brake which can prevent the clonk noise with a simple structure and can maintain the clonk noise prevention effect for a long period of time.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a projection view of FIG. 2 as viewed from below.

FIG. 4 is a sectional view of a second embodiment of the present invention.

FIG. 5 is a sectional view of a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc brake 2 Disc rotor 3 Caliper 3a Divided piece of caliper 3 (torque receiving member) 4 Pad 5 Pad lining 6 Pad back plate 6a First contact portion 6b Second contact portion 7 Shim 7a Anti-squeal portion 7b Anti-clonk portion 9 Cylinder bore 10 Piston

Claims (2)

[Claims] 1. A pad comprising a disk rotor rotating integrally with a wheel, a pad lining pressed against the disk rotor, and a pad back plate holding the pad lining, and pressing the pad toward the disk rotor. Piston, a shim disposed between the pad back plate and the piston, a caliper having a cylinder bore for accommodating the piston, and the pad and the disc rotor provided on a non-rotating portion of the vehicle body. A disc brake including a torque receiving member that receives a braking torque generated by sliding contact through the pad, wherein the shim abuts on the pad back plate and is pressed by the piston;
A disc brake, comprising: an anti-cronk portion that is disposed between the pad and the torque receiving member and generates a resilient force due to deformation of the pad as the pad approaches the torque receiving member. 2. The pad back plate according to claim 1,
A first contact portion that transmits the braking torque to the torque receiving member via the anti-chronic portion, and a second contact portion that directly contacts the torque receiving member and transmits the braking torque to the torque receiving member. And a disc brake having: