KR20170030813A

KR20170030813A - Disc brake

Info

Publication number: KR20170030813A
Application number: KR1020150128204A
Authority: KR
Inventors: 진성호
Original assignee: 주식회사 만도
Priority date: 2015-09-10
Filing date: 2015-09-10
Publication date: 2017-03-20

Abstract

Disclosed is a disc brake. According to an aspect of the present invention, the disc brake of the present invention comprises: a pair of pad plates to which a friction pad is attached to pressurize a disc and whose both sides have a protruding unit; a carrier which is fixated on a vehicle body and which has a slide groove, into which the protruding unit is inserted, on both sides to support the pair of pad plates and a combination bump on the top side of the slide groove; a caliper housing which is slidably combined with the carrier; and a pad spring which is placed in between the carrier and the pair of pad plates and which slidably supports the pair of pad plates. The pad spring comprises: a return unit which returns the pair of pad plates to their original position; and an abrasion detector unit which transmits a notification of when to replace the friction pad. The present invention aims to make a disc brake easy to manufacture and install by forming a return unit providing elastic force on a pad spring.

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 disc brake is used for a long period of time, the friction pad is worn, and a separate wear detection sensor is installed to inform the driver of the replacement time of the friction pad. However, the pad spring, the retraction spring and the wear detection sensor This increases manufacturing cost and assembly time.

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

The disc brake according to an embodiment of the present invention facilitates the manufacture and installation of the disc brake by forming a return portion on the pad spring that provides an elastic force to quickly return the pair of pad plates to the initial position after the braking operation.

In addition, the disc brake according to an embodiment of the present invention can reduce the manufacturing cost by integrally providing a wear detection unit for indicating the replacement timing of the friction pads in the return unit when the wear of the friction pad progresses over a certain level.

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 the vehicle body and having a slide groove in which the protrusion is fitted on both sides so as to support the pair of pad plates and a coupling protrusion formed on an upper side of the slide groove; A caliper housing slidably coupled to the carrier; And a pad spring interposed between the carrier and the pair of pad plates to slidably support the pair of pad plates. The pad spring includes a return spring for returning the pair of pad plates to an original position, And a disc brake provided with a wear detection part for indicating a replacement timing of the friction pad.

The return portion may be formed by bending and extending toward the protruding portion of the surface to which the friction pad is attached, and the abrasion detecting portion may be formed to protrude from the return portion to extend toward the disc.

In addition, the return portion and the wear detection portion may be formed integrally with the pad spring.

In addition, the projecting portion is formed with a support groove into which the return portion is inserted, and the support groove prevents the return portion from being released when the return portion is elastically deformed, and can guide the return portion.

The pad spring may include an upper contact portion which is in close contact with the upper surface of the carrier, a coupling portion which is connected to the upper contact portion to be coupled to the coupling jaw, and a coupling portion which is connected to the coupling portion, A return part connected to the guide part and supporting a lower end of the protrusion, a return part extending from the guide part to provide an elastic force in a direction away from the pair of pad plates, And a wear detection part that is bent from the return part and informs the replacement time of the friction pad.

The disc brake according to an embodiment of the present invention may prevent the drag phenomenon by providing a return portion for returning the pad plate to the original position in the pad spring for supporting the pad plate.

In addition, the abrasion detecting unit for informing the replacement timing of the friction pads is integrally provided in the return unit, thereby facilitating the manufacture and installation. Therefore, manufacturing cost can be reduced by eliminating a separate retraction spring and a wear detection sensor provided in a conventional disk brake.

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 pad spring included in a disc brake according to an embodiment of the present invention.
3 is a partial perspective view showing a state in which a pad plate is mounted on a pad spring provided in a disc brake.
4 is a partial perspective view showing an operation state of a disc brake according to a preferred embodiment of the present invention.
FIG. 5 is a view illustrating a state in which the wear detection unit provided on the pad spring contacts with the disc as the friction pad wears 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 30 having pad plates 20 spaced apart from each other by a predetermined distance so as to be retractable toward the disk 10 and a carrier 30 for pressing the pair of pad plates 20 against the disk 10, A pair of pad springs (not shown) which are interposed between the carrier 30 and the pair of pad plates 20 to slidably support the pair of pad plates 20 50).

A friction pad 21 is provided on the inner surface of the pair of pad plates 20 to frictionally contact the disk 10. Protrusions 22 are formed on both sides 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 a piston 41, which will be described later, and an outer pad plate 20 arranged in contact with a fingering 42, . The protrusion 22 of each pad plate 20 is formed with a support groove 26 for supporting a return portion 60 to be described later. The support groove 26 is formed in the protruding portion 22 of the surface to which the friction pad 21 is attached. The structure in which the return portion 60 is inserted and supported in the support groove 26 will be described below.

The carrier 30 is fixedly coupled 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. [ Slide grooves 32 are formed on both inner sides of the carrier 30 at positions corresponding to the projections 22 formed on both sides of the pair of pad plates 20, 33 are formed. In addition, guide holes 34 are provided in parallel with the slide grooves 32 on the upper both sides of the carrier 30. At this time, each slide groove 32 is formed in front of and behind the carrier 30 so that a pair of pad plates 20 are respectively installed. That is, as shown in the drawing, the slide grooves 32 formed on both sides of the carrier 30 are spaced apart from each other by a predetermined distance, and the disc 10 is opened to be smoothly inserted and positioned at the center thereof.

The projections 22 are fitted into the slide grooves 32 so that the pair of pad plates 20 are slid along the slide grooves 32 of the carrier 30. That is, when each pad plate 20 is advanced and retreated along the slide groove 32, braking force is generated while the friction pads 21 are in close contact with both sides of the disk 10.

The caliper housing 40 is slidably mounted on the carrier 30 as the guide rods 44 provided at both ends thereof are inserted into the guide holes 34 provided at both ends of the carrier 30. The caliper housing 40 includes a cylinder 43 in which a piston 41 for pushing the inner pad plate 20 can be moved forward and backward and a fingering 42 for pressing the outer pad plate 20 do.

A piston (41) is provided in the cylinder (43) so as to be movable forward and backward. The piston 41 moves forward when the braking hydraulic pressure is applied to the cylinder 43 and presses the inner pad plate 20 so that the caliper housing 40 is moved by the reaction force and the fingering 42 is moved 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 of the pad springs 50 is mounted on the carrier 30 to support the pair of pad plates 20 in a sliding manner. 2, the pad spring 50 includes an upper contact portion 51, a pair of engagement portions 53 connected to both sides of the upper contact portion 51 so as to be symmetrical to each other, A pair of guide portions 55 connected to the engaging portions 53, a tongue portion 57 connected to each guide portion 55, a return portion 60 formed by bending and extending from the guide portion 55, And a wear detection unit (61) extending from the return unit (60). At this time, the pad spring 50 is formed of a single body and is bent a plurality of times.

The upper close contact portion 51 is in close contact with one side of the upper portion of the carrier 30 and the upper side of the upper close contact portion 51 is protruded outward so as to face the carrier 30. [

The engaging portion 53 is formed by bending the engaging jaw 33 so that the engaging jaw 33 is engaged with the engaging jaw 33 of the carrier 30. At this time, the engaging portion 53 is provided at the upper end of the protruding portion 22 of the two pad plates 20.

The guide portion 55 is formed by bending the protruding portion 22 of the pair of pad plates 20 so as to be fitted into the slide groove 32. That is, the protruding portion 22 of the pair of pad plates 20 is inserted into the guide portion 55. The guide portion 55 is fixed to the bottom of the protruding portion 22, that is, (57). The tongue portion 57 functions as a bottom surface of the guide portion 55 and is bent in a direction perpendicular to the inner surface of the guide portion 55 to support the load of the pad plate 20. [ The pair of pad plates 20 are smoothly moved by the pad spring 50.

According to an aspect of the present invention, the guide portion 55 is provided with a return portion 60 to smoothly return the pad plate 20 to its original position after the braking operation. 2 and 3, the return portion 60 is formed to be symmetrical with respect to the mutually facing portions of the pair of guide portions 55, and is provided so as to be in contact with the projecting portion 22. [ More specifically, the return portion 60 is formed by bending and extending from the guide portion 55. The return portion 60 is located on the side of the disc 10 on which the friction pad 21 is attached and the protruding portion 22 of the surface on which the pad plate 20 is pressed, ). When the pad plate 20 is mounted on the pad spring 50, the protrusion 22 is inserted into the guide portion 55 and is supported in a state where the return portion 60 is inserted into the support groove 26 Respectively. At this time, the return portion 60 is in a state where it is not elastically deformed, that is, the braking operation is not generated. 4, when the pad plate 20 is pressed and moved toward the disc 10, the return portion 60 is elastically deformed in the opposite direction, that is, in a direction away from the disc 10, A restoring force is generated. Accordingly, when the brake is released, the pair of pad plates 20 is quickly returned to the original position due to the elastic restoring force of the return portion 60. As the return portion 60 is elastically deformed in the state of being inserted into the support groove 26, the return portion 60 is guided without being detached from the support groove 26 and is elastically deformed stably.

According to an aspect of the present invention, the pad spring 50 is provided with a wear detection part (not shown) that acts as a wear detection sensor to notify the replacement timing of the friction pad 21 when the friction pad 21 is worn over a certain level (61). More specifically, the abrasion detecting portion 61 extends from the return portion 60 so as to protrude toward the disk 10 side. 5, when the friction pad 21 is worn more than a certain amount, the wear detection part 61 bumps against the disk 10 during braking and generates noises, thereby causing the driver to replace the friction pad 21 . At this time, when the wear detection part 61 hits the disk 10, the wear detection part 61 receives the force from the disk 10. When the return part 60 is supported by the support groove 26 The abrasion detecting unit 61 and the return unit 60 are prevented from being separated from each other.

Meanwhile, it is possible to adjust the replacement timing of the friction pad 21 by adjusting the distance that the wear detection part 61 protrudes from the pad plate 20. That is, the longer the distance that the wear detection part 61 protrudes from the pad plate 20 becomes, the faster the replacement time becomes, and the shorter the protruding distance becomes, the slower the replacement time becomes.

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

First, the pad plate 20 before the braking operation is provided in a state of being spaced apart from the disk 10, and the return portion 60 is inserted into the support groove 26 of the projection 22 to be in contact with the disk 10. That is, as shown in FIGS. 3 and 5A, the return portion 60 supports the pad plate 20 in a state where the pad portion 20 is not elastically deformed.

In this state, the piston 41 is advanced by the braking oil pressure, and the return portion 60 is elastically deformed by the pad plate 20 when the pad plate 20 is pressed. That is, as shown in FIGS. 4 and 5 (b), the return portion 60 is elastically deformed and an elastic force is generated. Accordingly, when the brake is released, the pad plate 20 smoothly returns to its original position due to the elastic restoring force of the return portion 60. Therefore, a drag phenomenon can be prevented.

When the friction pad 21 is worn over a certain length of time by the use of the disc brake 100 for a long period of time, the wear detection part 61 collides with the disc 10 to generate noise, .

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
22: protrusion 26: support groove
30: carrier 40: caliper housing
50: Pad spring 53:
55: guide portion 57:
60: return portion 61: abrasion detecting portion
100: Disc brake

Claims

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 the vehicle body and having a slide groove in which the protrusion is fitted on both sides so as to support the pair of pad plates, and a coupling protrusion formed on an upper side of the slide groove;
A caliper housing slidably coupled to the carrier; And
And a pad spring interposed between the carrier and the pair of pad plates to slidably support the pair of pad plates,
Wherein the pad spring is provided with a return portion for returning the pair of pad plates to an original position, and a wear detection portion for indicating a replacement timing of the friction pad.

The method according to claim 1,
Wherein the return portion is formed by bending and extending toward a protrusion of a surface to which the friction pad is attached,
Wherein the abrasion detecting portion is formed to protrude from the return portion and extend toward the disc

3. The method of claim 2,
Wherein the return portion and the wear detection portion are integrally formed with the pad spring

3. The method of claim 2,
Wherein the protruding portion is formed with a support groove into which the return portion is inserted, and the support groove prevents the return portion from being released when the return portion is elastically deformed, and guides the return portion

The method according to claim 1,
Wherein the pad spring has an upper contact portion that is in close contact with the upper surface of the carrier, a coupling portion that is connected to the upper contact portion and is coupled to the coupling jaw, and a coupling portion that is connected to the coupling portion, A return portion connected to the guide portion and supporting a lower end of the protrusion, a return portion extending from the guide portion to provide an elastic force in a direction away from the pair of pad plates, And a wear detection part that is bent and extended from the friction pad to indicate the replacement timing of the friction pad.