JPH11264429A - Brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce brake squeal by arranging a vibration absorbing body composed of an alpha gel substance which is sealed inside a rim having a brake shoe attached thereto or a rear plate of a brake pad. SOLUTION: An anchor engagement part 13 is opened in one end side of a web 3b and an engagement 7a of a wheel cylinder 7 is opened in the other end side of the web 3b. A vibration absorbing body 20 is mounted in the other and side of a web 3. The vibration absorbing body 20 having an alpha gel substance 21 sealed in a holding body 23 is arranged across the web 3b. The vibration absorbing body is composed of a packing plate side vibration absorbing body 20a attached to the web 3b in the packing plate side and a drum side vibration absorbing body 20b attached to the web 3b in the drum side and the packing plate side vibration absorbing body 20a and the drum side vibration absorbing body 20b are connected to each other by a hole 25 in the web 3b. This constitution can prevent the generation of the brake squeal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device, and more particularly, to a reduction in vibration or brake squeal during braking of a brake shoe of a drum brake or a brake pad of a disc brake used in an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, with respect to the reduction of vibration or brake squeal generated when a vehicle is being braked, see Japanese Patent Application Laid-Open No. Hei 8-1.
Many publications such as 28470 are presented. According to the publication, the technology disclosed in JP-A-3-288028 is
This is a prior application of Japanese Patent Application Laid-Open No. 8-128470, in which a restraining member is attached to the inner surface of the rim of the brake shoe via a friction member in order to prevent the vibration of the brake shoe. Further, the technique disclosed in Japanese Utility Model Laid-Open No. 3-84436 prevents vibration of a brake shoe by attaching a weight to the inner surface of a rim.

According to Japanese Patent Application Laid-Open No. 8-128470, it is found that the main cause of brake squeal is caused by the vibration of the brake shoe, and the brake shoe is vibrating in the radial direction. Was. For this reason, in Japanese Patent Application Laid-Open No. 8-128470, as shown in FIG.
A hollow cylindrical rod 77 is erected on an inner surface of a rim 75 on which a lining 73 that generates a braking force by frictional resistance pressed against the drum 71 is mounted.
A weight 81 is attached to the base 7 via a ring-shaped elastic body 79. When the mass of the weight 81 is m and the spring constant of the elastic body is k, the natural vibration frequency of the weight attached via the elastic body,

It is described that f ₀ = (1 / (2π)) √ (k / m) is set to be lower than the squeezing frequency f _S due to lining. Regarding the disc brake, the same applicant as the above-mentioned Japanese Patent Application Laid-Open No. 8-128470 discloses the same thing in Japanese Patent Application Laid-Open No. 8-128473.

[0004]

However, Japanese Unexamined Utility Model Publication No. Hei 3-84436 and Japanese Unexamined Patent Publication No. Hei 8-128 are disclosed.
According to JP-A-470, as described in the publication,
In general, the brake squeal frequency is not a uniform frequency but a state in which a plurality of frequencies are mixed. For this reason, it is effective when the natural frequency of the weight coincides with the place where the squeal frequency f _S due to the lining is reduced.
There may be a displaced squeal frequency f _S by lining,
At that time, there is a problem that the effect is small.

The present invention focuses on the above-mentioned conventional problems, and relates to a brake device. In particular, the present invention absorbs vibration during braking of a brake shoe of a drum brake used for an automobile or the like or a brake pad of a disc brake, The purpose is to reduce brake squeal.

[0006]

According to the present invention, there is provided a brake device for braking a wheel or the like on an inner surface of a rim on which a brake shoe is mounted or on a back plate of a brake pad. And a vibration absorber made of an alpha-gel substance sealed in a holder. The vibration absorber may be disposed on the toe side in the case of a brake shoe in a drum brake, or on the reversing side or in the center of a brake pad in a disc brake.

[0007]

According to the above construction, during braking or when braking is released, the vibration generated in the brake shoe or the brake pad is absorbed by the vibration absorber attached to the inner surface of the rim or the back plate, and the brake shoe or the brake pad is absorbed. To prevent vibration. The brake squeal caused by this vibration is prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of a brake device according to the present invention will be described with reference to the drawings. FIG.
2 shows a partial side view of the drum brake of the first embodiment. In FIG. 1, a pair of arcuate brake shoes 3 are supported on a backing plate 5 inside a drum connected to wheels (not shown) and rotated, and each upper end of the brake shoes 3 has a piston. It engages with the provided wheel cylinder 7 and is pressed by the wheel cylinder 7 to generate a braking force due to frictional resistance.
The lower end of each of the brake shoes 3 is engaged with an anchor 9. The brake shoe 3 includes an arc-shaped rim 3a, an arc-shaped web 3b fixed inside the arc-shaped rim 3a, and a lining 3c fixed outside the arc-shaped rim 3a. Further, a spring 11 is attached to the web 3b.

FIG. 2 shows a view of the brake shoe, and FIG.
2A is a side view of the brake shoe, and FIG. 2B is a front view of the brake shoe. In FIG. 2, as described above, the engagement portion 13 of the anchor 9 is provided at one end (anchor side) of the web 3 b, and the engagement of the wheel cylinder 7 is provided at the other end (toe side) of the web 3 b. The part 7a is open. A vibration absorber 20 is attached to the other end (toe side) of the web 3b. The vibration absorber 20 has a structure in which the alpha-gel substance 21 is formed of a holding member 23 made of a thin plate material.
And the vibration absorber 2 on both sides of the web 3b.
0 is provided. The vibration absorber 20 includes a backing plate-side vibration absorber 20a attached to the wall surface of the backing plate-side web 3b, and a drum-side vibration absorber 20b attached to the drum-side web 3b. The backing plate-side vibration absorber 20a and the drum-side vibration absorber 20b are connected by a hole 25 in the web 3b. The alpha-gel substance 21 of the vibration absorber 20 is a colorless and transparent gel-like substance based on silicon, having a penetration of 50 to 200, and shock-absorbing over a wide frequency range (for example, 100 to 10K). Those having extremely high characteristics for preventing vibration and vibration are used.

Next, the operation of the above configuration will be described. When the brake oil pressure is introduced into the wheel cylinder 7 during operation of the drum brake, the piston in the wheel cylinder 7 operates in the Z direction in FIG. 1, and the piston rotates the pair of brake shoes 3 around the anchor 9. Then, the lining 3c is pressed against the inner circumference of the rotating drum to brake it. At this time, the brake shoe 3 is strongly pressed against the anchor 9, and it takes a few seconds for the drum to stop. At this time, various movements of the brake shoe 3 occur, causing resonance and noise. At this time, the vibration absorber 20 mounted on the web 3b prevents the occurrence of vibration and the occurrence of brake squeal.

When the web 3b tries to generate the lateral vibrations shown in the drawing alternately on the backing plate side and the drum side, the vibrations are prevented by the vibration absorber 20 (alpha-gel substance 21). Also, when the brake shoe 3 separates from the backing plate and tries to move to the drum side, it is attenuated against the wall of the web 3b by the alpha-gel substance 21 of the vibration absorber 20a on the backing plate side to prevent the occurrence of brake squeal. Also, when the brake shoe 3 moves from the drum side to the backing plate side, it is attenuated against the wall of the web 3b by the alpha-gel substance 21 of the drum-side vibration absorber 20b to prevent the occurrence of brake squeal. Further, the brake shoe 3 during braking has a large behavior in the lateral and rotational directions while slightly vibrating in the lateral and rotational directions.
a, 20b attenuates this actuation. Thereby, occurrence of brake squeal is prevented.

Next, the disc brake will be described with reference to the plan view of FIG. 3 and the front view of FIG. 3 and 4, the disc brake includes a caliper 32 straddling the rotor 30 and a support 34 attached to the vehicle body.
A pair of left and right parallel guide pins 3 supported by
Guided by 6, 38, it is movable along the axial direction of the rotor. A hydraulic cylinder 40 is provided on the inner side of the caliper 32, so that the inner pad 42 can be pressed against the inner surface side of the rotor 30. The outer pad 46 is pressed against the outer surface side of the rotor 30 by the outer caliper claw 44 by the movement of the caliper 32 due to the reaction force from the inner pad 42.

The support 34 is provided so as to straddle the rotor 30. One side 34a of the support 34 is disposed to face the inner surface of the rotor 30. The support 34 is fixed to the vehicle body by mounting bolts 48. Reference numeral 34b is disposed facing the outer surface of the rotor 30. The mounting positions of the guide pins 36 and 38 are set outside the peripheral edge of the rotor 30. The support 34 has an inner pad 42 and an outer pad 46 mounted thereon, so that the inner pad 42 and the outer pad 46 can be moved in the axial direction of the rotor, and can support rotational torque caused by braking.

FIG. 5 is a front view of the inner pad 42, FIG. 6 is a front view of the outer pad 46, and FIG. 7 is a side view of FIG. As shown in FIG. 5, the inner pad 42 includes a lining 51 having a substantially fan-shaped outer shape and a back plate 53a having substantially the same shape. On the opposite side of the back plate 53a to which the lining 51 is attached, and below the inflow side of the rotor 30, a vibration absorber 60
Of the inner vibration absorber 60a.

As shown in FIG. 6, the outer pad 46 includes a lining 51 having a substantially fan-shaped outer shape and a back plate 53b having substantially the same shape. Also,
The outer-side vibration absorber 60b of the vibration absorber 60 is mounted below the lining 51 on the back plate 53b to which the lining 51 is mounted. Although not shown, the outer vibration absorber 60b is configured similarly to the inner vibration absorber 60a. This vibration absorber 60
Is, as in the previous embodiment, the alpha-gel substance 21
The back plate 53 is enclosed in a holder 63 made of a thin plate material. The alpha gel substance 21 of the vibration absorber 60 is a colorless and transparent gel substance based on silicon,
The penetration is 50 to 200, and a wide range of frequencies (for example,
100 to 10K), which have extremely high characteristics in absorbing shock and preventing vibration.

In the above description, the vibration absorber 60 is provided at a location where the brake pad is likely to vibrate. For example,
The inner pad 42 may be provided at a portion protruding from the piston on the reciprocating side, or the outer pad 46 may be provided at a portion where there is no pressing due to the rigidity of the caliper 32 at the center inner periphery. Further, it may be attached to either the surface of the back plate 53 to which the pad is attached or the opposite surface.

Next, the operation of the above configuration will be described. The braking during the forward movement of the vehicle is performed by pressing the inner pad 42 against the rotor 30 with the inner pressing force Wi by the hydraulic cylinder 40 provided on the inner side of the caliper 32, and moving the caliper 32 due to the reaction force from the inner pad 42. The outer pad 46 is pressed against the rotor 30 with the outer pressing force Wo by the outer caliper claw 44 to perform braking.

At this time, the brake pads 42 and 46 pinch the rotor 30 to rotate integrally with the rotor 30, and at this time, a rotational moment Mf is applied to the brake pads 42 and 46.
Is generated, and a couple is generated on the brake pads 42 and 46 so as to rotate around the pinching portions. At the time of braking while the vehicle is moving forward, the rotation moment Mf is generated by the rotation of the rotor 30. Therefore, even when the braking is to be released, the turning-in sides of the brake pads 42 and 46 are entangled by this rotation moment Mf, The drag on the inflow side increases. At this time, the brake pads 42 and 46
Vibration is about to occur in a direction approaching the rotor or away from the rotor. This vibration is caused by the back plate 5
The vibration absorber 60 attached to 3 prevents the back plate 53 from vibrating, and prevents brake squeal. Vibration in the direction approaching the rotor is caused by the alpha
The gel substance 21 hits the wall of the back plate 53 to prevent vibration. Further, the vibration in the direction away from the rotor is caused by the fact that the alpha-gel substance 21 is applied to the wall 6 of the holder 63 made of a thin plate material.
Vibration is prevented at 3a.

[0019]

Since the present invention is constructed as described above, vibrations generated in the brake shoes or the brake pads during braking or when braking is released are prevented. As a result, generation of noise and squeal from the brake shoes or brake pads is prevented. In addition, since it is possible to suppress heat generated when contact is made while vibrating,
The durability and reliability of the brake device can be improved.

[Brief description of the drawings]

FIG. 1 shows a partial side view of a drum brake according to the invention.

2 shows a view of the brake shoe according to the invention, FIG.
2A shows a side view, and FIG. 2B shows a front view.

FIG. 3 shows a plan view of the disc brake of the present invention.

FIG. 4 shows a front view of the disc brake of the present invention.

FIG. 5 shows a front view of the inner pad of the present invention.

FIG. 6 shows a front view of the outer pad of the present invention.

FIG. 7 shows a side view of the brake pad of the present invention.

FIG. 8 is a partial side view of a conventional drum brake.

[Explanation of symbols]

 Reference Signs List 3 brake shoe 3a rim 3c lining 5 backing plate 7 wheel cylinder 9 anchor 20 vibration absorber 20a backing plate side vibration absorber 20b drum side vibration absorber 21 alpha / gel substance 30 rotor 32 caliper 34 support 40 hydraulic cylinder 42 inner pad 44 Caliper nail 46 Outer pad 51 Lining 53 Back plate 60 Vibration absorber 60a Inner vibration absorber 60b Outer vibration absorber 63 Holder

Claims (3)

[Claims] 1. A brake device for braking a wheel or the like, comprising an alpha-gel substance sealed in a holder on the inner surface of a rim (3a) of a brake shoe (3) or a back plate (53) of a brake pad. Vibration absorber (20, 6
0) A brake device characterized by being disposed. 2. The brake device according to claim 1, wherein the vibration absorber (20) is disposed on a toe side of a brake shoe of a drum brake. 3. The brake device according to claim 1, wherein the vibration absorber (60) is provided on a reversing side or a center portion of a brake pad of a disc brake.