KR20170019833A - Disc brake - Google Patents

Abstract

Disclosed is a disc brake, capable of reducing noise due to operation of a pad plate and preventing one-sided wear of a friction pad. According to an aspect of the present invention, the disc brake includes: a pair of pad plates having a protrusion unit on both sides, wherein a friction pad for pressurizing a disc is attached to the pair of pad plates; a carrier fixed to a vehicle body and having a slide groove in which the protrusion unit is inserted into both sides so that the pair of pad plates is supported; a caliper housing connected to the carrier to slide; a pad spring installed between the carrier and the pair of pad plates and supporting the pair of pad plates to slide; and a clip member installed in the protrusion unit and providing elasticity in order for the pair of pad plates to be separated from the disc.

Description

Disc brake

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a disc brake, and more particularly, to a disc brake for forcibly returning a pad plate to an original position by using an elastic force upon releasing a brake.

In general, a disk brake mounted on a vehicle is a device for decelerating, stopping, or stopping an automobile while driving, and is a device for strongly pressing a disk-shaped disk rotating together with a wheel from both sides to obtain a braking force.

Such a disc brake includes a pair of pad plates to which friction pads are attached, a carrier coupled to the vehicle body and having a pair of pad plates spaced apart from each other by a predetermined distance to be slidably supported, and a pair of pad plates And a pad spring interposed between the carrier and the pair of pad plates for slidably supporting the pair of pad plates.

The rear portion of the caliper housing is provided with a cylinder provided with a piston, and the front portion is provided with a formed finger portion bent downward. When the braking hydraulic pressure is supplied through the rear portion of the caliper housing, the piston provided on the cylinder pushes the pad plate on one side, and the finger portion provided on the front portion pushes the other pad plate toward the disk. Accordingly, a pair of pad plates presses the disk from both sides to perform braking.

In order to return the disk brake to its original position after a braking operation, a pair of pad plates is provided with a retraction spring. The disc brake with the retraction spring is disclosed in Laid-Open Publication No. 2014-0067202. According to the disclosed document, a pair of pad plates is provided with a coupling step at an upper end thereof, and a retraction spring provided at the coupling step to provide an elastic force to the pad plate. The retraction spring is disposed between the pad plate and the upper portion and the caliper housing.

However, since the retraction spring is provided on the upper portion of the pad plate, the manufacturing cost is increased due to the machining of the coupling jaws for installing the retraction spring, and the installation is difficult.

In addition, the retraction spring is provided in a state of being inserted into the pad plate, and thus, there is a problem that the retraction spring is detached due to external impact, vibration and excessive bending moment.

Further, as the braking action is repeated, the friction pad attached to the pad plate is consumed by friction with the disk, so that the retraction spring is plastic-deformed, so that the load capable of maintaining the interval between the disk and the friction pad is reduced There is a problem that a drag phenomenon occurs.

On the other hand, when the pad spring and the pad plate come into contact with each other during the braking operation, there is a problem that a perfect noise and squeal noise due to friction between metals occur.

Published Patent Publication No. 10-2014-0067202 (Apr.

The disc brake according to an embodiment of the present invention not only restores the pad plate to the original position through the elastic force of the pad clip installed on the pad plate, but also reduces the noise generated during the braking operation.

According to an aspect of the present invention, there is provided a magnetic disk drive comprising: a pair of pad plates having friction pads for pressing a disk and protrusions formed on both sides; A carrier fixed to a vehicle body and formed with slide grooves on both sides of which the protrusions are fitted to support the pair of pad plates; A caliper housing slidably coupled to the carrier; A pad spring interposed between the carrier and the pair of pad plates to slidably support the pair of pad plates; And a clip member installed on the protrusion to provide an elastic force in a direction in which the pair of pad plates are away from the disc.

In addition, the projecting portion may have a coupling groove formed on the front side and the rear side in the direction in which the pad plate is moved, and the clip member may include a mounting portion that is fitted in the coupling groove, And a return unit.

In addition, the mounting portion may be provided with a hook formed so as to surround the side surface of the protrusion and bent at both ends thereof to fit into the coupling groove.

The pad spring may have a pad attaching portion corresponding to a portion where the projection and the slide groove are coupled, and the pad attaching portion may be formed with an inclined portion having a slope corresponding to the return portion.

The carrier may have a seating groove corresponding to the inclined portion and having the inclined portion inserted therein.

The disk brake according to an embodiment of the present invention has an effect of preventing the drag phenomenon by forcibly returning the pad plate to the original position due to the clip member installed on the projection of the pad plate.

In addition, the function of centering the pad plate by the self-load of the clip member can prevent uneven wear of the friction pad due to the braking action, and also reduce noise caused by operation of the pad plate.

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.
1 is an exploded perspective view showing a disc brake according to a preferred embodiment of the present invention.
2 is a perspective view illustrating a clip member of a disc brake according to a preferred embodiment of the present invention.
3 is a partial plan view showing a state in which a clip member provided on a disc brake is installed on a pad plate according to a preferred embodiment of the present invention.
4 is a perspective view illustrating a pad spring included in a disc brake according to a preferred embodiment of the present invention.
5 is a partial perspective view illustrating a state in which a pad plate provided with a clip member provided on a disc brake is installed on a pad spring according to a preferred embodiment of the present invention.
6 is a partial cross-sectional view illustrating a state in which the clip member is elastically deformed as the pad plate of the disc brake is operated according to a preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

1 is an exploded perspective view showing a disc brake according to a preferred embodiment of the present invention.

Referring to the drawings, a disc brake 100 according to an embodiment of the present invention includes a pair of pad plates 20 for pressing both sides of a disc 10 rotating together with a wheel (not shown) A carrier 40 having pad plates 20 spaced apart from each other by a predetermined distance so as to be able to move back and forth toward the disk 10 and a carrier 40 for pressing the pair of pad plates 20 against the disk 10. [ A pair of pad springs 20 which are interposed between the carrier 40 and the pair of pad plates 20 to slidably support the pair of pad plates 20, (60) and a pair of pad plates (20) to provide an elastic force in a direction away from the disk (10).

A friction pad 21 is attached to one side of the pair of pad plates 20 and a protrusion 22 is formed on both side ends of the pad plate 20. At this time, the pair of pad plates 20 are divided into an inner pad plate 20 arranged to be in contact with the piston 51, which will be described later, and an outer pad plate 20 arranged in contact with a fingering 52, . The protrusion 22 of each pad plate 20 is formed with a coupling groove 23 for installing the clip member 30. The engaging grooves 23 are formed on the front and rear sides, respectively, in the direction in which the pad plate 20 is moved. The structure in which the clip member 30 is provided in the coupling groove 23 will be described below.

The clip member 30 is provided on each of the protrusions 22 and serves to provide an elastic force in a direction in which the pair of pad plates 20 are separated from the disk 10. [ 2 and 3, the clip member 30 includes a mounting portion 32 fitted to the coupling groove 23 and a return portion 34 of a free end extending from the mounting portion 32 by bending do.

The mounting portion 32 is formed so as to surround the side surface of the protruding portion 22. For example, the mounting portion 32 is formed to have a so-called 'C' shape. The mounting portion 32 is inclined at a predetermined angle in a direction in which both ends of the mounting portion 32 are stably installed on the protruding portion 22. Both ends of the mounting portion 32 are installed by pressing the front side and the rear side of the projecting portion 22. At this time, both ends of the mounting portion 32 are provided with a locking portion 33 which is bent to be engaged with the coupling groove 23. Accordingly, the clip member 30 moves together with the pad plate 20 as the mounting portion 32 is stably installed on the protruding portion 22.

The return portion 34 is formed by extending one end of the mounting portion 32 by bending. The return portion 34 has a slope in a direction away from the projecting portion 22, that is, in a direction toward the inner side surface of the carrier 40. The return portion 34 provides the elastic force restoring force to the pad plate 20 as the pad plate 20 is pressed and elastically deformed when the pad plate 20 is moved. The operation of returning the pad plate 20 to the original position through the clip member 30 will be described below again.

Referring again to FIG. 1, the carrier 40 is fixed to a knuckle (not shown) of the vehicle body so as to be positioned on one side of the outer periphery of the disk 10. A slide groove 42 is formed at a position corresponding to the projection 22 of the pair of pad plates 20 on both inner sides of the carrier 40. A coupling step 43 is formed on the upper side of the slide groove 42 . In addition, guide holes 45 are formed on both sides of the upper portion of the carrier 40. At this time, each slide groove 42 is formed in front of and behind the carrier 40 so that a pair of pad plates 20 are respectively installed. That is, as shown in the drawing, the slide grooves 42 formed on both sides of the carrier 40 are spaced apart from each other by a predetermined distance, and the disk 10 is opened to be smoothly inserted and positioned at the center thereof.

The projections 22 are inserted into the slide grooves 42 so that the pair of pad plates 20 are slid along the slide grooves 42 of the carrier 40. That is, when each pad plate 20 is advanced and retreated along the slide groove 42, the friction pads 21 are brought into close contact with the both side surfaces of the disk 10, and a braking force is generated.

According to an aspect of the present invention, the slide groove 42 is formed with a seating groove 44 into which an inclined portion (see '64' in FIG. 4) of the pad spring 60 to be described later is inserted. The seating groove 44 is formed to have a shape corresponding to the inclined portion 64. The structure in which the inclined portion 64 is provided in the seating groove 44 will be described below again.

The caliper housing 50 is slidably installed in the carrier 40 as the guide rods 55 provided at both ends thereof are inserted into the guide holes 45 provided at both ends of the carrier 40. The caliper housing 50 includes a cylinder 53 in which a piston 51 for pressing the inner pad plate 20 can be moved forward and backward and a fingering 52 for pressing the outer pad plate 20 do.

A piston (51) is provided on the cylinder (53) so as to be movable forward and backward. The piston 51 moves forward when the braking oil pressure is applied to the cylinder 53 and presses the inner pad plate 20 so that the caliper housing 50 is moved by the reaction force and the fingering 52 moves to the outer pad plate 20 To the disk 10 side. Accordingly, the braking force is generated as the pair of pad plates 20 press the disk 10.

Each pad spring 60 is mounted on the carrier 40 to support a pair of pad plates 20 to be slid. 4, the pad spring 60 includes an upper contact portion 61, a pair of engagement portions 63 connected to both sides of the upper contact portion 61 so as to be symmetrical to each other, And a pair of pad attaching portions 65 connected to the engaging portions 63. At this time, the pad spring 60 is formed of a single body and is bent a plurality of times.

The upper close contact portion 61 is in close contact with one side of the upper portion of the carrier 40 and the upper side of the upper close contact portion 61 is protruded outward so as to face the carrier 40.

The engaging portion 63 is formed by bending the engaging jaw 43 so that the engaging jaw 43 is engaged with the engaging jaw 43 of the carrier 40. At this time, the engaging portion 63 is provided at the upper end of the protruding portion 22 of the two pad plates 20.

The pad attaching portion 65 is formed by bending the protruding portion 22 of the pair of pad plates 20 so as to be fitted into the slide groove 42. That is, the protrusions 22 of the pair of pad plates 20 are inserted into the pad mounting portions 65. The pad mounting portions 65 support the lower portions of the protrusions 22, that is, the lower ends of the pad plates 20, . The support portion 67 functions as a bottom surface of the pad mounting portion 65 and is bent in a direction perpendicular to the inner surface of the pad mounting portion 65 to support the load of the pad plate 20. The pair of pad plates 20 are smoothly moved by the pad spring 60.

According to an aspect of the present invention, the pad mounting portion 65 is formed with an inclined portion 64 having a slope corresponding to the return portion 34 of the clip member 30 provided on the protruding portion 22. When the pad plate 20 is mounted on the pad spring 60, the protrusion 22 is inserted into the pad mounting portion 65 and supported so that the return portion 34 of the clip member 30 is supported by the inclined portion 64 So as to be in surface contact with each other (see Fig. 5). At this time, the return portion 34 is disposed in a state in which the inclination is not changed through the inclined portion 64. This state is a state in which no braking operation has occurred.

As the slope portion 64 is formed in the pad spring 60 as described above, the carrier 40 has the seating groove 44, which corresponds to the slope portion 64 and is installed with the slope portion 64 inserted therein, . That is, the seating groove 44 formed in the slide groove 42 is formed at a position corresponding to the inclined portion 64 formed in the pad mounting portion 65 of the pad spring 60. Accordingly, when the pad spring 60 is mounted on the carrier 40, the pad spring 60 is stably fixed to the inner surface of the carrier 40.

The braking operation state will now be described with the disc brake 100 having the above structure.

The return portion 34 of the clip member 30 provided on the protrusion 22 is provided on the inclined portion of the pad spring 60 64 so as to be in surface contact with each other. That is, as shown in FIG. 6 (a), the clip member 30 supports the pad plate 20 without being elastically deformed.

In this state, the piston 51 is advanced by the braking oil pressure and the clip member 30 moves together with the pad plate 20 when the pad plate 20 is pressed. At this time, as shown in FIG. 6 (b), the return portion 34 of the clip member 30 moves along the inclined portion 64 and is compressed to generate an elastic force. Accordingly, when the brake is released, the pad plate 20 smoothly returns to its original position due to the resilient restoring force of the return portion 34. Therefore, a drag phenomenon can be prevented. The clip member 30 is provided to provide an elastic force in the direction of the center of the pad plate 20 on both sides of the pad plate 20 so that the center of the pad plate 20 is prevented from being twisted, An effect of reducing the uneven wear due to the friction with the disk 10 can be obtained. In addition, the effect of reducing the perfect noise, the squeegee noise, and the like caused by the movement of the pad plate 20 occurs.

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: Disk 20: Pad plate
30: clip member 32:
34: Return unit 40: Carrier
42: slide groove 44: seat groove
50: caliper housing 60: pad spring
64: inclined portion 65: pad mounting portion
100: Disc brake

Claims (5)

A pair of pad plates to which a friction pad for pressing the disk is attached and protrusions are formed on both sides;
A carrier fixed to a vehicle body and formed with slide grooves on both sides of which the protrusions are fitted to support the pair of pad plates;
A caliper housing slidably coupled to the carrier;
A pad spring interposed between the carrier and the pair of pad plates to slidably support the pair of pad plates; And
And a clip member installed on the protrusion to provide an elastic force in a direction in which the pair of pad plates are away from the disc. The method according to claim 1,
Wherein the protrusions are formed with coupling grooves on the front and rear sides in the direction in which the pad plate is moved,
Wherein the clip member includes a mounting portion that is fitted to the coupling groove and a return portion that is bent from the mounting portion and has a tilt in a direction away from the protruding portion. 3. The method of claim 2,
Wherein the mounting portion is provided with a hook portion which is formed to surround the side surface of the protrusion and has both ends bent so as to be inserted into the coupling groove. 3. The method of claim 2,
Wherein the pad spring has a pad mounting portion corresponding to a portion where the projection and the slide groove are coupled,
And a slope portion having a slope corresponding to the return portion is formed on the pad mounting portion. 5. The method of claim 4,
Wherein the carrier has a seating groove corresponding to the inclined portion and having the inclined portion inserted therein.

Images