KR20090078853A - Disc brake for vehicle - Google Patents

Abstract

A disc brake for vehicles is provided to restrain a guide pin from rotating to prevent a pad plate and a through-hole of a fixing part from abrasion in advance. A disc brake for vehicles includes a disc, a pad plate(11), a fixed member(20) and a guide unit. The pad plate has a pair of friction pads attached to the inner side thereof. The fixed member is fixed to a car body to support the pad plate. The guide unit guides forward and backward motion of the pad plate between the fixed member and includes a guide pin(41) and an anti-rotation fixing plate. The guide pin penetrates the pad plate and the fixed member. The anti-rotation fixing plate fixes the guide pin and prevents the guide pin from rotating when the pad plate moves.

Description

Automotive Disc Brake {DISC BRAKE FOR VEHICLE}

1 is a perspective view of a vehicular disk brake according to a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of the vehicular disk brake of FIG. 1.

3 is an exploded perspective view of a guide unit included in the vehicular disk brake of FIG. 1.

4 is a perspective view of the combination of FIG.

* Description of the symbols for the main parts of the drawings *

10: disc 11,12: pad plate

11a, 12a: first through hole 13, 14: friction pad

20: fixing member 20a: second through hole

31,32: first and second pad spring 41: guide pin

41a: coupling groove 42: anti-rotation fixing pin

42a: coupling portion 42b: elastic coupling portion

42c: hanger

The present invention relates to a disc brake for a vehicle, and in particular, to provide a disc brake for a vehicle that can prevent the rotation of the guide pin.

BACKGROUND Brake devices for vehicles such as automobiles are generally braking force generators provided for each wheel, and include rotating members such as brake rotors and brake drums rotating together with the wheels, brake pads and brake shoes driven according to the amount of brakes. A braking force generating device including the same movable member is provided, and the braking force generating device generates a frictional force as the friction material of the movable member is pressed against the rotating member, and brakes the wheel corresponding thereto. The brake having a braking function converts the kinetic energy into a thermal energy by a mechanical friction device and releases the frictional heat into the air to brake the drum. The brake includes a drum hydraulic brake and a disk hydraulic brake. Among them, the disc brake is to obtain the braking force by pressing the disk-shaped disk that rotates together with the wheel instead of the drum with the pads from both sides, and the disc brake is exposed to the air in the atmosphere, and the heat dissipation is good, and the fade phenomenon is prevented. As the braking performance is stable and there is no magnetic action, the braking force of the left and right wheels is stable, so that only one side of the brake is braked during braking. In addition, it is easy to detach from the disk even if water or mud, etc., because the disk is not deformed by heat, there is little change in the step of the brake pedal, it is easy to check and adjust and has the advantage of simple.

An example of such a vehicle disc brake is disclosed in Korean Patent Laid-Open Publication No. 10-2004-39865.

The vehicle disc brake disclosed in the above publication has a pair of pad plates disposed on both sides of the disc so as to press both sides of the disc rotating together with the wheel of the vehicle, and the outer side of the pair of pad plates except the side of the disc direction. Includes a fixing part made of a casting. The upper surface of the fixing portion is fixed to the plate spring of the return spring of the present invention is installed, the inner side of the fixing portion is installed to contact the pad plate support portion integrally connected with the leaf spring.

In addition, a guide pin is provided through the pad plate and the fixing part, and the guide pin guides the pad plate to reciprocate between the fixing parts.

However, the guide pin mounted on the vehicle disc brake disclosed in the above publication rotates to a certain degree according to the operation of the disc brake, and if the rotation is repeated for a long time, wear occurs in the guide pin holes of the pad plate and the fixing part. .

The present invention is to solve this problem, it is an object of the present invention to provide a disc brake for a vehicle that can prevent the wear of the through-hole of the pad plate and the fixing part by preventing the rotation of the guide pin.

The vehicle disc brake of the present invention for achieving this object is a disk, a pair of pad plates with a friction pad attached therein, a fixing member fixed to a vehicle body to support the pair of pad plates, and the pair In the disk brake for a vehicle comprising a guide unit for guiding the pad plate of the advancing between the fixing member, the guide unit is fixed to the guide pin and the guide pin penetrating the pad plate and the fixing member, It characterized in that it comprises an anti-rotation fixing pin to prevent the rotation of the guide pin when the pad plate is advanced.

In addition, one end of the guide pin is formed with a coupling groove for coupling with the anti-rotation fixing pin, one side of the anti-rotation fixing pin is coupled to the coupling groove and the other side is characterized in that it is elastically coupled with the fixing member. do.

In addition, the anti-rotation fixing pin is characterized in that a pair of hook portion in contact with the fixing member is provided to prevent the guide pin from rotating with respect to the fixing member.

Hereinafter, with reference to the accompanying drawings a preferred embodiment according to the present invention will be described in detail.

1 is a perspective view of a vehicular disk brake according to a preferred embodiment of the present invention, Figure 2 is a cross-sectional view showing the configuration of the vehicular disk brake of FIG.

As shown in FIGS. 1 and 2, the disc brake to which the present invention is applied includes a first pad plate 11 disposed on both sides of the disc 10 to press both sides of the disc 10 rotating together with the wheel of the vehicle. ) And a second pad plate 12, and a fixing member 20 fixed to the vehicle body of the vehicle so as to support the pad plates 11 and 12. The fixing member 20 has a structure in which the fixing part 21 of the lower side is fixed to the vehicle body, and the center part is opened up and down to allow installation of the two pad plates 11 and 12 and entry of the disk 10. It is provided with a structure.

In addition, on both sides of the fixing member 20 for pressing the two pad plates (11, 12) toward the disk 10 is provided with a conventional piston and cylinder pressing means, the two pad plates inside the fixing member (20) The carrier 28 to which the 11 and 12 are mounted is provided.

The pressurizing means includes a first cylinder 22 and a second cylinder 23 integrated with the fixing member 20, and a first pad plate by braking hydraulic pressure in the first cylinder 22 and the second cylinder 23. And a first piston 24 and a second piston 25 for pressing the 11 and the second pad plate 12 toward the disk 10. This configuration allows the two pistons 24 and 25 to move toward the disc when a predetermined amount of brake oil flows into the compression spaces 26 and 27 formed through the cylinders 22 and 23 and the pistons 24 and 25. While pressing the two pad plates (11, 12).

The first pad plate 11 and the second pad plate 12 are installed to advance and retreat toward the disk 10 in a state in which the rotation is limited to the center of the fixing member 20, and is in contact with the disk 10. On one surface of each pad plate 11, 12, ordinary friction pads 13, 14 are attached to brake the disc 10 when the pad plates 11, 12 are pressed.

In addition, the pad springs 31 and 32 for preventing shaking of the two pad plates 11 and 12 and the pad springs 11 and 12 are provided on the upper portions of the two pad plates 11 and 12, respectively. Guide units 41 and 42 are formed.

The pad springs 31 and 32 may include a first pad spring 31 and a first pad spring 31 which are supported by guide pins 41 which will be described later, so that both sides of the pad plates 11 and 12 may be shaken. The second pad screen 32 is coupled to both ends and presses both sides of each pad plate (11, 12).

The first and second pad springs 31 and 32 are formed of an elastic plate spring having a predetermined width and length. The first and second pad springs 31 and 32 are bent and coupled to guide pins 41 at both sides of the first pad spring 31. The groove-type coupling portion 42a is provided, and both ends of the second pad spring 32 are bent in a round shape to provide elastic force to the pad plates 11 and 12.

3 is an exploded perspective view of a guide unit included in the vehicular disk brake of FIG. 1, and FIG. 4 is a combined perspective view of FIG. 3.

The pair of guide units 41 and 42 formed on the first pad plate 11 and the second pad plate 12 are moved back and forth with the two pad plates 11 and 12 stabilized as shown in FIGS. 1, 3 and 4. The guide pins 41 and the rod-shaped guide pins 41 which are disposed in the advancing direction of the two pad plates 11 and 12 and support the two pad plates 11 and 12 and the guide pins 41 are fixed to the fixing member 20. It is fixed and comprises a rotation preventing fixing pin 42 for preventing the guide pin 41 from rotating when advancing and retracting the pad plate (11, 12).

At this time, the first pin hole 11a, respectively, in the upper center of the first pad plate 11 and the second pad plate 12 so that the guide pin 41 can support the respective pad plates 11 and 12 in a retractable manner. 12a) is formed, and the second through hole 20a is formed in the upper portion of the fixing member 20 to correspond to the first through holes 11a and 12a. Therefore, the guide pin 41 is fitted to pass through the first and second through holes 11a, 11b, and 20a, and both ends of the guide pin 41 are fixed to the fixing member 20.

The anti-rotation fixing pin 42 is for fixing the guide pin 41 to the fixing member 20 by coupling to one end of the guide pin 41, one end of the guide pin 41 is the anti-rotation fixing pin 42 Coupling groove (41a) is formed for coupling with, one side of the anti-rotation fixing pin 42 corresponding to the coupling portion (42a) is inserted into the coupling groove 41a is formed and the anti-rotation fixing pin 42 The other side of the) is formed with an elastic coupling portion 42b for coupling with the fixing member (20).

The anti-rotation fixing pin 42 inserts the coupling portion 42a into the coupling groove 41a, and elastically deforms the elastic coupling portion 42b to be coupled to the inside of the fixing member 20 to prevent the rotation fixing pin ( A pair of hook portions 42c connecting the coupling portion 42a and the elastic coupling portion 42b of the 42 are fixed to contact the upper end 20b of the fixing member 20.

Therefore, even when the pair of pad plates 11 and 12 are advanced along the guide pin 41 by the operation of the disc brake, the guide pin 41 is fixed to the fixing member 20 by the anti-rotation fixing pin 42. Since it does not rotate, it is possible to prevent the first and second through holes 11a, 11b, and 20a from being worn due to the rotational friction of the guide pin 41 and the first and second through holes 11a, 11b, and 20a. do.

The following describes the operation of the disc brake according to the present invention in this configuration.

When the driver presses the brake pedal and the braking hydraulic pressure of the master cylinder is supplied into the first cylinder 22 and the second cylinder 23 on both sides of the fixing member 20, the first piston 24 and the second piston ( 25 respectively advance toward the disc 10. The first pad plate 11 and the second pad plate 12 are pushed toward the disk 10 by the first piston 24 and the second piston 25 to press the surface of the disk 10 to press the disk 10. ) Is braked.

When the braking operation is terminated and the pressure inside the cylinders 22 and 23 is released, the first pad plate 11 and the second pad plate 12 are spaced apart from the surface of the disk, thereby braking the disk 10. Is released.

Therefore, even when the pair of pad plates 11 and 12 are advanced along the guide pin 41 by the operation of the disc brake, the guide pin 41 is fixed to the fixing member 20 by the anti-rotation fixing pin 42. Since it does not rotate, it is possible to prevent wear of the first and second through holes 11a, 11b, and 20a into which the guide pin 41 is inserted. In particular, since the guide pin does not rotate even when the vehicle travels on rough roads such as uneven roads, wear of the first and second through holes can be prevented.

As described in detail above, the vehicle disk brake according to the present invention is provided with an anti-rotation fixing pin to prevent the rotation of the guide pin to prevent the through-holes of the pad plate and the fixing part due to the rotation of the guide pin. It can be effective.

Claims (3)

A disk, a pair of pad plates having friction pads attached therein, a fixing member fixed to a vehicle body to support the pair of pad plates, and the pair of pad plates guide the retreat between the fixing members. In the vehicle disc brake comprising a guide unit to The guide unit further includes a guide pin penetrating the pad plate and the fixing member, and an anti-rotation fixing pin which fixes the guide pin and prevents the rotation of the guide pin when the pad plate is advanced. Car disc brakes. According to claim 1, One end of the guide pin is formed with a coupling groove for coupling with the anti-rotation fixing pin, one side of the anti-rotation fixing pin is coupled to the coupling groove and the other side is elastically coupled with the fixing member Disc brake for a vehicle, characterized in that. The disk brake of claim 1, wherein the anti-rotation fixing pin is provided with a pair of hook portions in contact with the fixing member to prevent the guide pin from rotating about the fixing member.

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