KR20120096960A

KR20120096960A - Disc brake

Info

Publication number: KR20120096960A
Application number: KR1020110016242A
Authority: KR
Inventors: 이형재
Original assignee: 주식회사 만도
Priority date: 2011-02-24
Filing date: 2011-02-24
Publication date: 2012-09-03

Abstract

PURPOSE: A disk brake is provided to reduce vibration and noise related with a pad plate even when the shape deformation of a pad spring occurs. CONSTITUTION: A disk brake comprises a disk(10), a carrier(20), a caliper housing(40), and a pad spring(50). The disk is rotated with a wheel. The carrier comprises a pair of pad plates(31, 35) pressed on both sides of the disk. The carrier comprises a slide groove(21) fit to protrusions(32, 36) and a latching sill(22) formed in the top portion of the side groove. The caliper housing is mounted on the carrier to be movable and operates the pair of pad plates. The pad spring is installed between the pad plates. The pad spring comprises a guide part(56) for the protrusion and a coupling part(53) restricting the movement of the pad plates and supports the pad plates such that the pad plates can slide.

Description

Disc brake

The present invention relates to a disc brake, and more particularly, to a disc brake having an improved structure of a pad spring for slidably supporting the pad plate.

In general, a disc brake is a device for braking a vehicle by forcing a friction pad to press both sides of a disc rotating together with a wheel.

Conventional disc brakes are coupled to a vehicle body, and a pair of pad plates with friction pads attached thereon are provided with a carrier installed therein so as to be spaced apart from each other, and slidably coupled to the carrier so as to press the two pad plates with a disc. It includes a cylinder in which the piston is installed and a caliper housing provided with a finger on the other side.

The caliper housing is retractably coupled to the carrier by two guide rods coupled to both sides thereof, and the pair of padplates are supported by the carrier so as to retract toward both sides of the disk.

When braking a disk rotating at high speed using such a disk brake by pressure, a very large friction force is required. Therefore, the brake pad plate of the disk brake vibrates violently, and metallic joints, that is, rattle noise, are generated. Will occur. Thus, rattle noise was prevented through a pad spring between the carrier and the pair of pad plates.

1A and 1B show a state where the pad plate 2 is installed on the pad spring 1, respectively. In this case, the pad spring 1 shown in FIGS. 1A and 1B has the same function as the pad spring 1, which will be described later, having a difference in a bending shape.

Referring to the drawings, the pad spring 1 is installed on a carrier (not shown) to serve as a guide for the pad plate 2 to smoothly slide on the carrier (not shown), and also to support the pad plate 2. At the same time serves to prevent the shaking of the pad plate (2).

The pad spring 1 as described above includes a guide portion 1a into which the protrusion portions 2a protruding from both sides of the pad plate 2 are fitted, and extending from the guide portion 1a to the pad plate 2 side. And a stopper part 1b for supporting the lower part of 2a, and an engaging part 1c extending above the guide part 1a and being coupled to the carrier. At this time, the protrusion 2a of the pad plate 2 is made to be inserted into a slide groove (not shown) formed on both sides of the carrier, and the guide portion 1a of the pad spring 1 between the protrusion 2a and the slide groove. ) Is positioned so that the stopper part 1b supports the load of the pad plate 2.

On the other hand, in order to reduce noise during braking action, the movement of the pad plate 2 installed in the pad spring 1 should be limited. That is, there should be no movement in the vertical direction and the horizontal direction of the pad plate 2. Thus, as shown, the bent edges 1b are bent together with a portion of the vertical surface of the guide portion 1a (see FIG. 1A) or the entirety of the vertical surface of the guide portion 1a (see FIG. 1B) so that the bending angle ( It is formed to have alpha (alpha) '. That is, the action of the pad plate 2 is limited by making the elastic part 1b press the elastic force that is urged upward from the lower part of the protrusion 2a. That is, even if the protrusion 2a of the pad plate 2 inserted in the guide portion 1a is supported by the upper surface of the guide portion 1a and compressed by the stopper portion 1b, the pad plate 2 may be impacted. The noise (rattle noise) is made to be prevented.

However, the dimension H affecting the load generated by the pad spring 1 is influenced by the tolerance of the bending of the finger portion 1b, and when the bending angle α (α ') is increased, the pad plate ( 2) there is a disadvantage in terms of assembling in installing the pad spring (1). In addition, when the bending angle α (α ′) is reduced, it is difficult to limit the behavior of the pad plate 2, and there is a problem that noise is generated by vibration.

The present invention is to solve the above problems, by changing the shape of the pad spring can play a role of the pad spring while reducing the noise of the vibration of the pad plate and improve the assembly with the pad plate To provide a disc brake.

In order to achieve the above object, the disc brake of the present invention, a disk-shaped disk that rotates with the wheel, a pair of pad plates, which are respectively squeezed on both sides of the disk, the carrier is installed to be retractable toward the disk, A caliper housing movably mounted to the carrier and operating between the pair of pad plates and a pad spring interposed between the carrier and the pair of pad plates to slidably support the pair of pad plates. A disc brake comprising: a slide groove corresponding to protrusions formed on both sides of the pair of pad plates, and a coupling jaw formed on an upper side of the slide groove, wherein the pad spring is fitted into the slide groove. Sliding projections of the pair of pad plates A guide part supporting the support part, a crimp part extending so as to be bent from the guide part to support the lower part of the protruding part to limit the behavior of the pad plate in the vertical direction, and a coupling part extending to the upper part of the guide part to fit the engaging jaw. A groove is provided and has a coupling portion for limiting the behavior of the pad plate in the horizontal direction.

According to the present invention, the coupling part is provided on an upper portion of the guide portion in which the pair of pad plates slide, and the coupling part facing the side surfaces of the pair of pad plates is bent so as to be in line contact with the side surfaces of the pair of pad plates. A true support is formed.

In addition, the finger portion forms the bottom surface of the guide portion is bent at a right angle from the inner surface of the guide portion is formed by the end is bent.

Preferably, the pad spring further includes an upper contact portion formed to extend above the coupling portion and provided with an upper coupling piece protruding outward, and a fixing piece formed on the side of the guide portion and the coupling portion.

The disc brake according to the present invention has a bottom portion of the pad spring at the bottom of the projecting portion on which the pad plate is slid by a pad spring provided to reduce metallic joints (rattle noise) generated by vibration of the carrier and the pad plate. As a result, the vertical plate is restricted, and the upper plate is smoothly slid as the horizontal plate is restricted by the support of the coupling unit. In addition, as compared with the related art, as the bending angle of the tungsten portion supporting the lower portion of the pad plate decreases, the assemblability of the pad plate is improved.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in detail with reference to the following drawings, which illustrate preferred embodiments of the present invention, and thus the technical idea of the present invention should not be construed as being limited thereto.
1A and 1B are views illustrating a state where a conventional pad spring is installed on a pad plate.
2 is an exploded perspective view schematically showing a disc brake according to a preferred embodiment of the present invention.
3 is a perspective view showing an extract of the pad spring provided in the disk brake according to an embodiment of the present invention.
4 is a partial front sectional view showing a part of the configuration of the disc brake according to the preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

2 is a perspective view schematically showing a disc brake according to a preferred embodiment of the present invention.

Referring to the drawings, the disc brake according to the present invention is a disk 10 that rotates together with the wheel, a pair of pad plates (31) (35) which are respectively pressed on both sides of the disk 10 is installed to be retractable A caliper housing 40 movably mounted to the carrier 20 to operate the carrier 20, the pair of pad plates 31, 35, the carrier 20 and the pair of pad plates 31. A pair of pad springs 50 are disposed between the pads 35 to support the pair of pad plates 31 and 35 so as to be slidable.

The carrier 20 is coupled to a knuckle (not shown) of the vehicle body so as to be located on the outer circumferential side of the disk 10. Both inner side portions of the carrier 20 are provided with slide grooves 21 corresponding to the protrusions 32 and 36 formed on both side surfaces of the pair of pad plates 31 and 35. Coupling jaws 22 are provided at the upper portions of the slide grooves 21 at both inner sides of the carrier 20, respectively. In addition, guide holes 23 are provided at both upper portions of the carrier 20 in parallel with the slide groove 21.

Friction pads 33 and 37 which are rubbed with the disk 10 are formed on the inner side surfaces of the pair of pad plates 31 and 35, respectively, and protrusions are formed at both ends of the pad plates 31 and 35, respectively. 32) 36 are formed. In this case, the pair of pad plates 31 and 35 may include an inner pad plate 31 disposed to contact the piston 42 to be described later, and an outer pad plate 35 disposed to contact the finger unit 44 to be described later. Separated by. The pair of pad plates 31 and 35 are fitted with the protrusions 32 and 36 fitted into the slide grooves 21 of the carrier 20 so as to slide along the slide grooves 21. When each of the pad plates 31 and 35 is advanced along the slide groove 21, the friction pads 33 and 37 are brought into close contact with both sides of the disk 10 to generate braking force.

The caliper housing 40 is movably installed in the carrier 20 by a pair of guide rods 41 slidably inserted into the guide holes 23, respectively. The caliper housing 40 includes a cylinder 43 in which a piston 42 for pressing the inner pad plate 31 is removably installed, a finger portion 44 for pressing the outer pad plate 35, and a ping. And a connection 45 connecting the reject 44 and the cylinder 43.

The piston 42 is installed in the cylinder 43 so as to be able to move forward and backward. The piston 42 presses the inner pad plate 31 while moving forward when the braking hydraulic pressure is applied to the cylinder 43.

Each pad spring 50 is installed in the carrier 20 to support the pair of pad plates 31 and 35 so as to slide. More specifically, referring to FIGS. 3 and 4, the pad spring 50 is coupled to the upper contact part 51 and a pair of coupling parts 53 connected to both sides of the upper contact part 51 so as to be symmetrical to each other. ), A pair of guide parts 56 connected to each coupling part 53, and a finger portion 58 connected to each guide part 56. At this time, the close contact portion 51, the coupling portion 53, the guide portion 56 and the finger portion 58 constituting the pad spring 50 is formed integrally, it is formed bent a plurality of times.

The upper contact part 51 is a part in close contact with the upper one side of the carrier 20, the upper contact part 51 is formed by protruding the upper coupling piece 52 to the outside.

The coupling part 53 is bent to form a coupling groove 54 into which the coupling jaw 22 is fitted as a portion that is coupled to the coupling jaw 22 of the carrier 20. At this time, the coupling portion 53 is provided so as to be located on the top of the protrusions 32, 36 of the two pad plates 31, 35, the coupling portion of the position facing the side of each pad plate (31, 35) 53 is bent to make line contact with the side surfaces of the pad plates 31 and 35. That is, the coupling part 53 is provided by bending the support part 55 protruding toward the pad plates 31 and 35 so as to be in line contact with both side surfaces of each pad plate 31 and 35.

In addition, the guide portion 56 is bent so as to form a guide groove 57 corresponding to the protrusions 32 and 36 of the pair of pad plates 31 and 35 as a portion coupled to the slide groove 21. Is formed. The guide grooves 57 are inserted with protrusions 32 and 36 of a pair of pad plates 31 and 35, and the height of the guide grooves 57 can be smoothly slid. It is formed larger than the height of the projections (32, 36).

On the other hand, the fixing piece 59 is provided on the side portions of the coupling portion 53 and the guide portion 56.

According to the present invention, the finger portion 58 extends inwardly from the guide portion 56 to support the lower portions of the protrusions 32 and 36. That is, the finger portion 58 is formed by bending under the guide portion 56. Such a finger portion 58 is bent at right angles to the inner surface of the guide portion 56 with the function as the bottom surface of the guide portion 56 is bent end. Accordingly, the edge portion 58 is applied to the end of the pad plate 31, 35 load.

As shown in FIG. 4, the pad spring 50 is installed to cover the engaging jaw 22 and the slide groove 21 on the inner side of the carrier 20. The engaging jaw 22 of the carrier 20 is fitted into the engaging groove 54 of the engaging portion 53, and the guide portion 56 of the pad spring 50 is fitted into the slide groove 21 of the carrier 20. Lose. The fixing pieces 59 of the coupling portion 53 and the guide portion 56 are in close contact with the outer surface of the carrier 20 to prevent the pad spring 50 from being easily detached from the carrier 20.

In addition, the protrusions 32 and 36 of the pair of pad plates 31 and 35 are slidably inserted into the guide grooves 57 of the pad spring 50. In the state where each of the protrusions 32 and 36 is fitted into the guide groove 57, the end portion of the stop part 58 of the pad spring 50 supports one lower side of each of the protrusions 32 and 36.

Hereinafter, the operation of the disc brake and the action of the pad spring according to the preferred embodiment of the present invention will be described.

When the braking hydraulic pressure formed in the master cylinder (not shown) is transmitted to the cylinder 43 of the caliper housing 40, the piston 42 presses the inner pad plate 31 toward the disk 10. When the friction pad 33 of the inner pad plate 31 comes into close contact with one side of the disk 10, the caliper housing 40 moves in the opposite direction to the piston 42 moving direction due to the reaction force of the piston 42. Pushed. At this time, the finger portion 44 pulls the outer pad plate 35 toward the other side of the disk 10, and the friction pad 37 of the outer pad plate 35 is connected to the friction pad 33 of the inner pad plate 31. The braking force is generated while being in close contact with the disk 10 together.

On the other hand, when the braking hydraulic pressure applied to the cylinder 43 is removed, the piston 42 retreats in the opposite direction of the disk 10 and the caliper housing 40 returns to its original position, thereby providing a pair of pad plates 31 and 35. ) Withdraws from the disk 10 along the guide groove 57 of the pad spring 50.

When the operation of the disc brake 100 is repeated, the stop portion 58 of the pad spring 50 loads the protrusions 32 and 36 of the pair of pad plates 31 and 35 in an appropriate size. By elastically supporting the pair of pad plates 31, 35 so as to be able to slide smoothly.

In addition, the support part 55 formed on the coupling part 53 is in linear contact with both side surfaces of the pair of pad plates 31 and 35 to limit the movement in the lateral direction, thereby reducing the noise (rattle noise) during the braking action. Will be reduced.

As a result, the support part 55 restricts the behavior of the two pad plates 31 and 35 in the horizontal direction R, and in the lower part of the sliding protrusions 32 and 35, the stopper part 38 has two pad plates. Since the behavior in the vertical direction (T) of the (31) (35) is limited, the pair of pad plates (31) (35) can slide smoothly.

In addition, the size of the pad spring 50, which has a large influence on the load, does not receive the shape of the bent edge portion 58, so that the advantages of easy assembly of each pad plate 31 and 35 are generated. do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

10 disc 20 carrier
31, 35: a pair of pad plates 32, 36: protrusions
40: caliper housing 50: pad spring

Claims

A disk that rotates together with a wheel, a pair of pad plates each pressed onto both sides of the disk, and a carrier that is removably mounted toward the disk, and the pair of pad plates that are movably mounted to the carrier. A disc brake having a caliper housing for activating a pad and a pad spring interposed between the carrier and the pair of pad plates to slidably support the pair of pad plates.
The carrier is provided with a slide groove corresponding to the protrusions formed on both sides of the pair of pad plates and a coupling jaw formed on the slide groove,
The pad spring is inserted into the slide groove, the guide portion for slidingly supporting the protrusions of the pair of pad plates, and extends to bend from the guide portion to support the lower portion of the protrusion to support the movement of the pad plate in the vertical direction The disc brake, characterized in that it has a coupling portion for limiting the behavior of the pad plate in the horizontal direction is provided with a coupling groove extending to the upper portion of the guide portion is fitted with a coupling jaw is fitted.

The method of claim 1,
The coupling part is provided on an upper portion of the guide slides a pair of pad plate, the coupling portion facing the side of the pair of pad plate is formed with a curved support portion to be in line contact with the side of the pair of pad plate Disc brake featured.

The method of claim 1,
The stopper portion forms a bottom surface of the guide portion and is bent at a right angle from the inner surface of the guide portion, characterized in that the end is formed by bending the end.

4. The method according to any one of claims 1 to 3,
The pad spring further includes an upper close contact portion formed to extend above the engaging portion and provided with an upper engaging piece protruding outward, and a fixing piece formed on the side of the guide portion and the engaging portion.