KR20110021170A - Noise reducing apparatus of brake - Google Patents

Abstract

PURPOSE: A device for reducing the noise of a brake is provided to absorb the collision energy in spite of the friction between a brake shoe and a back plate by using a spring and rubber member. CONSTITUTION: A device for reducing the noise of a brake comprises a back plate(50), a brake shoe(30), and a shoe rim(31). The back plate is combined in the axle of a vehicle. A hold-down spring is arranged in the front side of the back plate to be separated and is restored by the elastic restoring force. A plurality of shoe rims is arranged on the table side of two brake shoes and is touched with the back plate. A shock-absorbing unit absorbing the collision energy is installed on the contact area of the back plate with a shoe rim. The shock-absorbing unit is installed between the brake shoe and the back plate. The shock-absorbing unit is composed of elastic member(20) having the elastic force. The elastic member is arranged in the part in which one part is contacted with a contact unit(52) formed in the brake shoe and the back plate.

Description

 Noise reduction device for brakes {NOISE REDUCING APPARATUS OF BRAKE}

The present invention relates to a noise reduction device of a brake, in particular, having a structure that can mitigate the collision between the brake shoe and the back plate, even when a collision occurs between the back plate and the brake shoe during braking, absorbs the impact energy by absorbing the impact sound A noise reduction device of a brake for reducing.

       In general, a vehicle brake is a device that decelerates or stops the wheel's rotational speed and maintains a parking state by applying friction to the wheel to convert the rotational force of the wheel into heat energy and then releasing it to the atmosphere. It is divided into mechanical, hydraulic and pneumatic using wires, and there are drum type and disc type when the main body of the brake that generates braking force is structurally divided.

       The mechanical drum brake is a device operated by a parking cable associated with the parking brake lever, and when used as the parking brake, it can be used in combination with the disc brake for rear wheel braking by hydraulic pressure. This type is called D.I.H (Drum In Hat).

1 is an exploded perspective view illustrating a drum brake according to the prior art, FIG. 2 is a side view illustrating a drum brake according to the prior art, and FIG. 3 is a front view of the brake shoe and the back plate contacting the prior art.

Referring to Figure 1 and 2 will be described the structure and operation of the drum brake as follows.

When the driver presses the brake pedal, hydraulic pressure is generated in the master cylinder, and the hydraulic pressure is transmitted to the wheel cylinder 1 through the brake pipe, and the wheel cylinder 1 is connected to the brake shoe through an expansion mechanism such as an operating pin or a cam. Drum) to expand the brake shoe (3).

It is pressed against the inner wall of (7).

When the brake shoe 3 is compressed to the drum 7 as described above, the frictional force necessary for braking is generated through the lining 5 attached to the brake shoe 3, and thus the rotational speed of the wheel that rotates together with the drum 7. Is reduced and stopped.

Then, when the driver releases the brake pedal, the brake shoe 3 is restored to its original position by the upper and lower return springs 9 and 11 to maintain a certain air gap with the inner wall of the drum 7. .

That is, the upper and lower return springs 9 and 11 serve to maintain the outer diameter concentric circles of the brake shoe 3 so that the brake shoe 3 maintains a constant gap with the drum 7.

In addition, the brake shoe 3 is held in the rotation axis direction of the drum 7 by a hold down spring 13 installed at the center portion, and the hold down spring 13 and the upper and lower return springs. (9) (11) are all provided in the web (3b) part of the brake shoe (3).

As shown in FIG. 3, the brake shoe 3 is only supported in the rotational axis direction of the drum 7 by the hold down spring 13 installed at the center portion, so that the brake shoe 3 and the brake shoe 3 are braked. If the brake shoe 3 flows in the direction of the rotation axis of the drum 7 due to non-uniform friction between the linings 5, the flow of the upper and lower portions of the brake shoe 3 cannot be caught.

In other words, the brake shoe 3 is in line contact with the wheel cylinder 1 and the location plate 15 on the upper and lower sides, respectively, but does not have a structure for supporting the upper and lower portions of the brake shoe 3. Therefore, the upper and lower portions of the brake shoe 3 are exposed to the rotational axis direction of the drum 7 in a defenseless manner.

Accordingly, in the drum brake according to the related art, the upper and lower portions of the brake shoe 3 are shaken due to the flow in the rotational direction of the drum 7 during braking, so that the shoe rim 4 of the brake shoe 3 has a back plate ( 17), a large noise is generated by the steel-steel contact between the back plate 17 and the shrim 4.

The present invention has been made in order to solve the problems of the prior art, an object of the present invention is to provide a noise reduction device of the brake that can prevent the impact noise caused by the behavior of the shoe during the operation of the brake by installing the spring and rubber.

The noise reduction device of the brake according to the present invention for solving the above problems, and a back plate coupled to the axle of the vehicle; A pair of brake shoes disposed to be spaced apart from the front surface of the back plate and having a hold down spring installed thereon to be restored by an elastic restoring force;

A plurality of shrims arranged on the side surfaces of the two brake shoes and contacting the back plate; The contact surface of the back plate to which the shrim is in contact is configured to include a buffer means for absorbing the collision energy is installed.

The cushioning means is provided between the brake shoe and the back plate, and is made of an elastic member having an elastic force.

In addition, the elastic member is disposed in a portion in which at least one portion of the contact portion formed in the brake shoe and the back plate contact, characterized in that the tension of the elastic member is lower than the hold down spring tension of the lining.

     On the other hand, the elastic member is made of a leaf spring or a rubber material (rubber).

       The noise reduction device of the brake according to the present invention configured as described above has a structure that can alleviate the collision between the back plate and the brake shoe when the brake shoe flows in the direction of the rotational axis of the drum. Even if a collision occurs, the collision energy can be absorbed, thereby reducing the noise caused by the collision.

        Hereinafter, with reference to the accompanying drawings the structure of the noise reduction device of the brake according to a preferred embodiment of the present invention will be described in detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you.

Figure 4 is a front view showing a noise reduction device of the brake according to the invention, Figure 5 is a front view showing a noise reduction device of another brake in the present invention, Figure 6 is a noise reduction device of another brake in the present invention 7 is a front view showing an operating state according to the present invention.

The noise reduction device of the brake according to the present invention includes a back plate 50 coupled to the axle of the vehicle; A pair of brake shoes 30 disposed to be spaced apart from the front surface of the back plate 50 and having a hold down spring 13 installed thereon and restored by an elastic restoring force; A plurality of shrims (33) disposed on side surfaces of the table (31) of the two brake shoes (30) and in contact with the back plate (50); The contact portion 52 of the back plate 50 in contact with the shrim 33 is configured to include a buffer means 20 for absorbing the collision energy is installed.

The structure and operation described in the prior art will be described and the structure according to the present invention will be described in detail. The brake silencer includes the back plate 50 when the brake shoe 30 flows in the rotational axis direction of the drum 7. ) Between the brake shoe 30 and the back plate 50 on which the brake shoe 30 is mounted is provided with a cushioning means 20 that can alleviate the collision between the brake shoe 30 and the brake shoe 30. As the shock absorber 20 is installed to face the side surface of the table 31 of the brake shoe 30, the shock absorber 20 is disposed on the side surface of the table 31 when the brake shoe 30 flows in the direction of the rotation axis of the drum 7. A plurality of brake shoe rims 33 are formed.

As shown in FIG. 4, the back plate 50 is formed with an adhesive portion 52 protruding to contact the shrim 33, and the adhesive portion 52 is formed with the brake shrim 33 6. The elastic members 20 are respectively formed in the two seats to absorb the collision energy between the adhesive portion 52 and the shrim 33, respectively.

The elastic member 20 is disposed on the contact surface 52a of the contact portion 52.

The elastic member 20 is formed in the form of a leaf spring, the center portion is curved, both ends are fixed to the formed contact surface (52a) of the back plate 50.

The tension of the leaf spring 20 is preferably lower than the tension of the hold down spring (13) of the lining.

In addition, in another embodiment shown in Figure 5, the elastic member 20 is installed below the plate-shaped contact portion 52 in contact with the shrim 33. That is, by mounting the leaf spring 20 between the contact portion 52 and the back plate 50 may serve to absorb the collision energy during the flow, as shown in Figure 6 the contact portion 52 Various types of elastic members may be installed on the contact surface 52a of the rubber material having a high elasticity rubber 22 having a strong elastic force to reduce the noise by contacting the shrim 33 to reduce noise.

Looking at the operating state of the noise reduction device of the brake of the present invention made as described above are as follows.

First, in the normal state in which the brake shoe 30 does not flow in the rotational axis direction of the drum 7, the leaf spring 20 provided at the contact portion of the back plate 50 is braked as shown in FIG. It serves to support the shoe 30 in the rotation axis direction of the drum (7).

Then, the brake shoe 30 is generated by the brake braking in the direction of the rotation axis of the drum 7, so that the shrim 33 falls from the leaf spring 20 as shown in (b) and (c), and then again the plate. When the spring 20 is hit, the leaf spring 20 is pressed and pressed.

At this time, the leaf spring 20 is compressed to absorb the collision energy between the shrim 33 and the back plate 50 to prevent the noise caused by the collision to reduce the impact sound.

Thereafter, the hold down spring 13 is pushed to the brake shoe 30 while trying to recover to its original length by its elastic force, and thus the leaf spring 20 acts to push the shoe rim 33 When the brake shoe 30 returns to the normal state, the leaf spring 20 is also restored by supporting the brake shoe 30 by a restoring force.

The present invention has been described above with reference to the embodiments shown in the drawings. However, the present invention is not limited to this, and those skilled in the art to which the present invention pertains have various modifications that are equivalent to the present invention by those skilled in the art to which the present invention pertains. Alternatively, other embodiments are possible. Accordingly, the true scope of protection of the present invention should be determined by the following claims.

The noise reduction device of the brake according to the present invention is a device for reducing the impact sound colliding between the brake shoe and the back plate, and may be provided with a general elastic member and various elastic members.

1 is an exploded perspective view showing a drum brake according to the prior art,

2 is a side view showing a drum brake according to the prior art,

3 is a front view of a brake shoe and a back plate contacting each other according to the related art;

4 is a front view showing a noise reduction device of a brake according to the present invention;

5 is a front view showing a noise reduction device of another brake according to the present invention;

Figure 6 is a front view showing another noise reduction device of the brake in the present invention,

Figure 7 is a front view showing the operating state of the noise reduction device according to the present invention.

<Explanation of symbols on main parts of the drawings>

       20: elastic member 22: rubber (rubber)

       30: brake shoe 31: shrim

       50 back plate 52 contact portion

Claims (5)

A back plate coupled to the axle of the vehicle;      A pair of brake shoes disposed to be spaced apart from the front surface of the back plate and having a hold down spring installed thereon to be restored by an elastic restoring force; A plurality of shrims disposed on the side surfaces of the two brake shoes to contact the back plate; The contact surface of the back plate that the shrim is in contact with the noise reduction device of the brake comprising a buffer means for absorbing the collision energy is installed. The method according to claim 1, The damping means is provided between the brake shoe and the back plate, the noise reduction device of the brake made of an elastic member having an elastic force. The method according to claim 2, The elastic member is a noise reduction device of the brake disposed at a portion in which at least one portion is in contact with the contact portion formed in the brake shoe and the back plate The method according to claim 2,     And a tension of the elastic member is lower than a hold down spring tension of the lining.       The method according to claim 2,       The elastic member is a leaf spring or a noise reduction device of a brake of high hardness rubber (rubber).

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