KR20090087181A

KR20090087181A - Brake

Info

Publication number: KR20090087181A
Application number: KR1020080012472A
Authority: KR
Inventors: 최재영
Original assignee: 주식회사 만도
Priority date: 2008-02-12
Filing date: 2008-02-12
Publication date: 2009-08-17

Abstract

A brake is provided to rapidly cool the piston heated by friction heat in braking by forming an air flow channel in a piston. A brake is composed of a disk, a pad plate, and a piston(70). The disk is rotated with a wheel of a vehicle. The pad plate is equipped with a friction pad contacting with the disk. The piston pressurizes the pad plate, and has an air flow channel(71). The external air is flowed into the piston through the air flow channel.

Description

Brake {BRAKE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle brake, and more particularly, to a disk brake in which a piston structure is improved to improve a heat radiation effect.

In general, a vehicle brake is divided into a drum brake and a disc brake. Among these, the disc brake strongly presses the disk-shaped disk rotating together with the wheels with pads on both sides to obtain braking force.

1 shows an example of a conventional disc brake.

As shown in FIG. 1, a conventional disc brake 1 is fixed to a vehicle body with a caliper housing 3 provided with a piston 2 so as to move forward and backward by braking hydraulic pressure, and the caliper housing 3 is slidably coupled thereto. And a disk 6 which rotates with the wheel while a part of the outer circumference is inserted between the carrier 9 and the pad plates 4 and 5.

One side of the caliper housing 3 is provided with a cylinder 3a in which braking hydraulic pressure is transmitted and the piston 2 is installed to move forward and backward. The other side of the caliper housing 3 is integrally provided with a finger portion 3b extending downward to surround the outer pad plate 5 described later. The finger portion 3b keeps the pad 5a of the outer pad plate 5 close to the disk 6 during braking.

In addition, a seal 7 is installed between the inner circumference of the cylinder 3a and the outer circumference of the piston 2 to apply a restoring force to the piston 2, and an elastic material to prevent the inflow of foreign substances at the inlet of the cylinder 3a. The booth 8 provided with is arrange | positioned.

On the other hand, the carrier 9 is bolted to the knuckle of the vehicle body, and a pair of pad plates 4 and 5 to which the pads 4a and 5a are attached is slidably installed in the carrier. The pad plates 4 and 5 are inner pad plates 4 arranged to be in direct contact with the tip of the piston 2 to receive pressure directly, and outer pad plates 5 arranged to be in contact with the inner surface of the finger portion 3b. ).

When the driver steps on the brake pedal (not shown) while driving the vehicle having the disc brake configured as described above, a braking hydraulic pressure is formed in the master cylinder (not shown) and transferred to the cylinder 3a, whereby the piston 2 moves forward. do.

When the piston 2 is advanced, the pad 4a attached to the inner pad plate 4 is instantaneously pressed onto one side of the disk 6. In addition, since the braking hydraulic pressure remains in the cylinder 3a, the caliper housing 3 itself moves in the opposite direction of the piston 2, whereby the pad 5a attached to the outer pad plate 5 has the disk 6 It is pressed against the other side of) and acts as a brake.

Then, when the driver releases the brake pedal, the braking hydraulic pressure is released to restore the piston 2, and the pads 4a and 5a are also separated from the disk 6 again to the initial state of the disk brake.

However, in the conventional brake as described above, there is a problem that the brake oil is heated as the frictional heat between the disk 6 and the pad 4a is transferred to the brake oil as it is via the piston 2 without a separate cooling process during the braking action. . If the brake oil is heated, the braking force may be lowered in extreme situations in which the brake is continuously operated, which may cause a danger.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a vehicle brake that can quickly cool a piston heated by frictional heat during braking.

In the brake according to the present invention for achieving the above object is a brake having a disk that rotates with the wheel of the vehicle, a pad plate is attached to the friction pad friction with the disk, and a piston for pressing the pad plate, The piston may include an air flow channel formed to allow external air to flow into the piston.

The air flow channel may include an air flow groove formed at an end portion of the piston in contact with the pad plate.

The piston may further include a heat dissipation structure for widening the heat exchange area with the air introduced into the piston.

The heat dissipation structure may include a heat dissipation groove or a heat dissipation protrusion formed on the inner surface of the piston.

According to the present invention, the piston heated by frictional heat during braking is rapidly cooled by the air introduced into the piston. Therefore, it is possible to prevent the brake oil from being overheated by the heat transferred from the piston, thereby reducing the braking performance, thereby improving the operation reliability of the brake.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. 2 and 3 are exploded perspective and sectional views showing the configuration of the brake according to the invention, Figure 4 is a perspective view showing the piston in the brake according to the invention.

2 and 3, the brake 10 is applied to both sides of the disk 20 to pressurize both sides of the disk 20 and the disk 20 to rotate together with the wheels of the vehicle to perform braking. Caliper housing 60 and piston 70 for pressurizing the first and second pad plates 30, 40 and the first and second pad plates 30, 40 with friction pads 31, 41, respectively. ), A carrier 80 for supporting the first and second pad plates 30 and 40 and the caliper housing 60.

The carrier 80 supports the first and second pad plates 30 and 40 so that they can retreat toward both sides of the disk 20. In addition, the carrier 80 supports the caliper housing 60 to advance and retreat in the direction in which the first and second pad plates 30 and 40 are pressed.

The caliper housing 60 includes a cylinder portion 61, an extension portion 62 extending from the cylinder portion 61 toward the second pad plate 40, and an extension portion so as to support the rear surface of the second pad plate 40. A finger portion 63 extending from 62. The caliper housing 60 includes a cylinder portion 61, an extension portion 62, and a finger portion 63 integrally.

The piston 70 is installed in the cylinder portion 61 so as to pressurize the first pad plate 30 so as to be able to move forward and backward. The piston 70 advances toward the first pad plate 30 by the pressure of the brake oil supplied into the cylinder portion 61 to press the first pad plate 30. Detailed description of the piston 70 will be described later.

Support jaws 32 and 42 are provided on both sides of the first and second pad plates 30 and 40 so as to be supported on both sides of the carrier 80 so as to be retractable, and on both sides of the carrier 80. Guide surfaces 81 are provided to support the jaws 32 and 42.

The caliper housing 60 moves forward and backward in a braking direction by supporting two guide rods 90 respectively provided on both sides so as to be able to move forward and backward on both sides of the carrier 80. Guide holes 82 are formed on both sides of the carrier 80 so as to be slidably supported, and coupling holes through which the guide rod 90 penetrates on both sides of the caliper housing 60 are formed. 64 is formed.

When the disc brake is supplied with high pressure brake oil into the cylinder 61, as shown in FIG. 3, the piston 70 moves in the direction of arrow A to press the friction pad 31, and the caliper housing ( The finger portion 63 presses the friction pad 41 as the 60 moves in the arrow B direction. That is, the piston 70 and the caliper housing 60 move in opposite directions to press the two friction pads 31 and 41 to brake the disk 20.

When braking is performed as described above, friction heat is generated between the friction pad 31 and the disk 20, and the friction heat is transferred to the brake oil inside the cylinder part 61 via the first pad plate 30 and the piston 70. Delivered. Accordingly, the present invention allows the piston 70 to be cooled quickly to prevent overheating of the brake oil.

As shown in FIGS. 3 and 4, the piston 70 has a cylindrical shape with one end 70a open, and one end 70a of the open piston 70 is connected to the first pad plate 30. It is installed to contact. One end portion 70a of the piston 70 is exposed to the outside of the cylinder portion 61.

The piston 70 has an air flow channel 71 formed to allow external air to flow into the piston 70. Air introduced into the piston 70 through the air flow channel 71 exchanges heat with the piston 70 to cool the piston 70.

The air flow channel 71 may be composed of air flow grooves 71a formed at one end of the piston 70. The air flow grooves 71a are disposed at regular intervals in the circumferential direction at one end of the piston 70.

In addition, the piston 70 has a heat dissipation structure 72 formed to widen the heat exchange area to effectively exchange heat with the air introduced therein. The heat dissipation structure 72 may be composed of a plurality of heat dissipation grooves 72a and heat dissipation protrusions 72b formed on the inner surface of the piston 70. The heat dissipation grooves 72a and the heat dissipation protrusion 72b are alternately disposed along the longitudinal direction of the piston 70.

As described above, in the present invention, the air is communicated to the inside of the piston 70, thereby rapidly cooling the piston 70, thereby preventing overheating of the brake oil due to frictional heat generated during braking.

1 shows a conventional disc brake.

2 and 3 are an exploded perspective view and a cross-sectional view showing the configuration of the brake according to the present invention.

Figure 4 is a perspective view of the piston in the brake according to the invention.

Explanation of symbols on the main parts of the drawings

10 brake 20 disc

30, 40: pad plate 31, 41: friction pad

70: piston 71: air flow channel

71a: Air flow groove 72: Heat dissipation structure

72a: heat dissipation groove 72b: heat dissipation protrusion

Claims

A brake comprising a disk rotating with a wheel of a vehicle, a pad plate having a friction pad friction with the disk, and a piston for pressing the pad plate.

And the piston includes an air flow channel formed to allow external air to flow into the piston.

The method of claim 1,

And the air flow channel includes an air flow groove formed at an end portion of the piston contacting the pad plate.

The method according to claim 1 or 2,

The piston further comprises a heat dissipation structure for extending the heat exchange area with the air introduced therein.

The method of claim 3,

The heat dissipation structure is a brake, characterized in that it comprises a heat dissipation groove or a heat dissipation protrusion formed on the inner surface of the piston.