KR20100023666A

KR20100023666A - Disc brake

Info

Publication number: KR20100023666A
Application number: KR1020080082551A
Authority: KR
Inventors: 김홍기
Original assignee: 주식회사 만도
Priority date: 2008-08-22
Filing date: 2008-08-22
Publication date: 2010-03-04

Abstract

PURPOSE: A disk brake is provided for a convex surface of a concavo-convex back plate which is coated with elastic material to function as a shim, so the separate installation of the shim is unnecessary. CONSTITUTION: A disk brake comprises a friction material(43) and a back plate(42). The friction material and the back plate are attached to each other. A concavo-convex part is formed on both sides of the back plate. A concavo-convex part is formed on one side of the back plate. The back plate is forged.

Description

DISC BRAKE}

The present invention relates to a disc brake, and more particularly, to a disc brake having an improved back plate shape so as to enhance shear strength of a brake pad, reduce production cost, and eliminate the need for separate installation of shims.

In general, a brake mounted on a vehicle is a device for decelerating, stopping or maintaining a stopped state of a vehicle, and includes a drum brake and a disc brake. Disc brake is to obtain a braking force by pressing the disk-like disk that rotates with the wheel instead of the drum with a pad on both sides, the structure is as follows.

1 is a side cross-sectional view schematically showing a conventional disc brake.

As shown in FIG. 1, a conventional disc brake has a caliper housing 1 having a piston 2 embedded therein so as to move forward and backward by braking hydraulic pressure, and fixed to a vehicle body, and both ends of the caliper housing 1 are guide rods (not shown). A carrier (not shown) slidably mounted through the) and a disk 3 rotating together with the wheel while a part of the outer circumference is inserted between the pair of back plates 4 and 5.

The caliper housing 1 is provided with a cylinder 6 on which the piston 2 is installed and a finger portion 7 which is bent to surround the outer back plate 5 so that the braking hydraulic pressure is transmitted. When acting, the pair of back plates 4 and 5 is pushed toward the disc 3 side. In addition, a seal 8 is installed inside the cylinder 6 to apply a restoring force to the piston 2, and a boot made of a rubber material to prevent foreign substances from entering the inlet of the cylinder 6. (9) is arranged.

The carrier is then mounted to the knuckle of the vehicle body via bolts, where a pair of backplates 4 and 5 are slidably installed toward the disc 3 side, respectively. The pair of pad plates 4 and 5 have an inner back plate 4 which is directly in contact with the front end of the piston 2 to receive pressure, and an outer back plate 5 which is arranged to be in contact with the inner surface of the finger portion 7. ).

Therefore, when the driver presses the brake pedal (not shown) and the braking hydraulic pressure generated from the master cylinder (not shown) is transmitted to the cylinder 6, the piston 2 moves forward in the direction of arrow A. Therefore, the friction material 4a of the inner pad plate 4 is instantaneously pressed onto one side of the disk 3 rotating together with the wheel. In addition, since there is hydraulic pressure inside the cylinder 6, the caliper housing 1 slidably mounted to the carrier moves in the direction of arrow B, whereby the finger portion 7 pushes the outer back plate 5, The friction material 5a attached thereto is pressed against the other side of the disk 3 to exert a braking force.

When the foot is released from the brake pedal, the braking hydraulic pressure acting on the cylinder 6 is released, and a pair of back plates are produced by the friction force (residual drag) of the disk 3 and the friction materials 4a and 5a. As the piston 2 is restored together with 4 and 5, the disk 3 and the friction materials 4a and 5a are spaced apart from each other.

2 and 3, the conventional brake pad is composed of a friction material 23 in contact with the disk, a back plate 11 and 22 holding it, and a shim 21 for reducing noise. The back plates 11 and 22 support the friction material 23 and the shim 21 for reducing noise, and serve to secure rigidity of the brake pads.

Therefore, in the related art, when the brake pedal is pressed when the brake is actuated, the force for pressurizing the brake pad is largely acted, and when the shear strength or rigidity of the brake pad is weak, the friction material 23 may be damaged or the adhesive part may fall. In addition, the conventional back plates 11 and 22 have a problem in that the hole 12 is processed separately before the friction material 23 is formed.

And it was inconvenient to attach a noise reduction shim (21) to the back plate (11, 22) separately.

The present invention has been made to solve the above problems, an object of the present invention is to change the shape of the back plate to strengthen the shear strength of the brake pads, reduce the production cost, do not need to install a separate shim It is to provide a disc brake.

Disc brake according to the present invention to achieve the above object is a disc brake including a friction material and a back plate bonded to each other, the back plate is characterized in that the irregularities formed on both sides.

In addition, the back plate is characterized in that the concave-convex is formed on one surface and the concave-convex alternately with the concave-convex of the one surface on the other surface.

In addition, the convex surface of the concave-convex surface of the back plate surface which is not in contact with the friction material is characterized in that coated with an elastic material.

In addition, the back plate is characterized in that the forging process.

According to this structure, the shear strength of the entire brake pad is strengthened due to the uneven shape of the back plate surface, the hole processing is unnecessary, and the production cost required for the hole processing is reduced, and the convex surface of the uneven surface of the back plate surface is reduced. The elastic material is coated to play a role of the shim, so there is no need to install a shim separately.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a plan view of the back plate of the present invention, and FIG. 5 is a cross-sectional view taken along line II-II of FIG.

As shown in Figures 4 and 5, the brake pad of the disc brake according to the present invention is a back plate (31, 42) formed with irregularities on both sides, a friction material 43 adhered to one side of the back plate, an elastic coating It is comprised by the convex surface 32 of this backplate unevenness | corrugation.

The shape of the conventional back plate (11, 22) had a problem that the friction material is broken or torn against the external force during the brake operation, if the irregularities are formed on both sides of the back plate (31, 42), the back during the operation of the brake Shear strength and rigidity are enhanced with respect to the external forces acting on the plates 31 and 42 and the friction material 43, so that the friction material is not broken or torn.

In addition, in the related art, after the hole 12 is processed in the back plates 11 and 22, the friction material 23 is processed. However, the back plates 31 and 42 of the present invention are formed of holes. By forming the friction material 43 without the need for the machining process, the production cost and additional costs required for hole processing are reduced, and the production time is also shortened.

Unevenness on both sides of the backplates 31 and 42 may cause irregularities to be alternately formed on both sides, which makes it easier to process the backplates 31 and 42 as compared to the unevennesses on which both sides are different from each other.

Conventionally, the friction material 23 is formed in the back plates 11 and 22 processed with holes 12, and the blocking material 24 is filled in the hole 12 processing portions, and the blocking material ( 24 and a noise reduction shim 21 are attached to the upper surface of the back plate 22. However, according to the present invention, after the friction material 43 is molded, the convex surface 32 of the concave-convex surface 32 of the back plate surface which is not immediately in contact with the friction material 43 without being filled with a blocking material or having a shim attached thereto is formed. It is coated with this elastic material. Then, only the elastic coating replaces the role of the existing noise reduction shim. As the elastic material, rubber material is typically used.

The back plates 31 and 42 may be forged. Forging refers to the operation of improving the mechanical properties while simultaneously pressing and molding a metal into a desired shape or dimension by hammering it with a suitable temperature. Therefore, when the back plates 31 and 42 are forged, the mechanical properties are excellent, and the shear strength and rigidity are enhanced with respect to the external force during brake operation.

Hereinafter will be described the operation relations and effects according to the present invention.

When the driver presses the brake pedal while the vehicle is running, a braking hydraulic pressure is formed in the master cylinder, which is transmitted to the cylinder, and the piston presses the back plate 42. At this time, the friction material 43 moves together while being molded on the back plate to rub against the disk, and a pressing braking force is generated on the side of the disk.

During this braking action, a shear force acts on the friction material 43 and the back plates 31 and 42 by friction between the disk and the friction material 43, and concave and convexities of the irregularities of the back plates 31 and 42 are caused. The continuous shape makes the structure easy to withstand these external forces. That is, the external force applied to the back plates 31 and 42 and the friction material 43 is spread evenly in the concave and convex shape of the unevenness, and as a result, the shear strength of the brake pad is enhanced and the rigidity is enhanced.

In addition, the convex surface 32 of the irregularities of the back plates 31 and 42 is coated with an elastic material during braking, so that the elastic coating surface takes the role of a shim for reducing noise. .

In addition, when the back plates 31 and 42 are forged, the structure and mechanical properties are excellent, so that the shear strength and rigidity of the brake pad are further enhanced.

2 is a plan view of a conventional back plate

3 is a cross-sectional view taken along the line I-I of FIG.

Figure 4 is a plan view of the back plate of the present invention

5 is a cross-sectional view taken along the line II-II of FIG.

11: backplate 12: hole

21: shim 22: backplate

23: friction material 24: blocking material

31: back plate 32: convex surface of irregularities

41: elastic coating 42: back plate

43: friction material

Claims

A disc brake comprising a friction material and a back plate bonded to each other, wherein the back plate is a disc brake, characterized in that irregularities are formed on both sides.

The disc brake of claim 1, wherein the back plate has irregularities formed on one surface thereof, and irregularities formed alternately with the irregularities of the one surface thereof on the other surface thereof.

The disc brake according to claim 1, wherein the convex surface of the concave-convex surface of the back plate surface which is not in contact with the friction material is coated with an elastic material.

The disc brake according to claim 2, wherein the convex surface of the concave-convex surface of the back plate surface which is not in contact with the friction material is coated with an elastic material.

The disc brake according to any one of claims 1 to 4, wherein the back plate is forged.