KR20160141434A

KR20160141434A - Disc brake

Info

Publication number: KR20160141434A
Application number: KR1020150077082A
Authority: KR
Inventors: 송기배
Original assignee: 주식회사 만도
Priority date: 2015-06-01
Filing date: 2015-06-01
Publication date: 2016-12-09

Abstract

Disclosed is a disc brake. According to an embodiment of the present invention, the disc brake includes: a pair of pad plates separately pressurized to both sides of a disc rotating with a wheel; a carrier combined with a vehicle body, and including a slide groove to insert protruding parts, formed on both sides of the pad plates, in order to enable the pad plates to move forward and backward; and a caliper housing installed in the carrier to be movable, and operating the pad plates. A through hole is formed in each of the protruding parts in forward and backward directions of each of the pad plates. The disc brake includes a return spring installed in the through hole to provide elastic force in a direction in which the pad plates get away from each other.

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 which is coupled to the vehicle body and supports the pair of pad plates so as to be slidable at a predetermined interval, and a pair of pad plates The caliper housing being slidably coupled to the carrier.

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.

On the other hand, a return spring is installed on a pair of pad plates for returning the original position of the pair of pad plates to the disk brake after the braking operation. The disc brake provided with the return spring is disclosed in Japanese Utility Model Laid-Open Publication No. 05-012772. According to the disclosed document, there is provided a retraction spring that forms a hole at the upper end of a pair of pad plates and is fitted in the holes to provide an elastic force to the pad plate. The retraction spring is disposed between the pad plate and the upper part and the caliper housing.

However, since the retraction spring is provided on the upper portion of the pad plate to provide an elastic force for returning, the moment about the sliding position of the pad plate is formed. That is, the pad plate rotates about the sliding direction in which the pad plate moves back and forth in the horizontal direction, and the pad is unevenly worn. Thus, noise is generated during braking.

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. That is, since there is no separate fixing member for fixing the retraction spring, there is a problem that the function of returning the pad plate is lost when the retraction spring is released, resulting in a vehicle safety accident.

JP Public utility model public evaluation 05-012772 (February 19, 1993)

The disc brake according to an embodiment of the present invention provides a resilient force to return the pair of pad plates to the sliding portion of the pad plate, thereby preventing the pad from being unevenly worn.

In addition, the disc brake according to an embodiment of the present invention can prevent a deviation of a return spring that provides an elastic force to a pair of pad plates, thereby making it possible to perform a stable braking action.

According to an aspect of the present invention, a pair of pad plates, which are respectively pressed on both sides of a disk rotating together with a wheel, and protrusions formed on both sides of each pad plate so as to be movable forward and backward, And a caliper housing movably mounted on the carrier and operating the pair of pad plates, wherein each of the protrusions is formed with a through hole in a retracting and retracting direction of each pad plate And a return spring installed on the through hole to provide an elastic force in a direction in which the pair of pad plates are separated from each other.

The return spring may include a pair of rods inserted into the through holes of the facing projecting portions, respectively; A pair of pressing portions which are bent from the pair of rods and are pressed by the projections in accordance with the forward and backward movement of the pad plate; And a connecting portion connecting the pair of pressing portions.

Further, a bent portion may be formed between the pressing portion and the rod to prevent the pushing portion from being stably inserted into the through-hole.

The pair of pressing portions may be disposed between the pair of pad plates.

Also, a pad spring interposed between the carrier and the pair of pad plates for supporting the pair of pad plates so as to be slidable is provided, and the release spring is provided on the pad spring to prevent the return spring from being separated .

In addition, the release preventing portion may be formed by bending a portion of the pad spring that is formed by cutting a part of the pad spring.

In addition, the separation preventing portion may be provided at the upper end of the return spring and may support the upper side of the return spring.

The disc brake according to an embodiment of the present invention can prevent the pads from being unevenly provided by providing a resilient force to return the pair of pad plates to the sliding portion of the pad plate. Accordingly, the braking noise generated during the braking operation can be reduced, and the life of the pad provided on the pad plate can be improved.

In addition, the return spring can be stably fixed by providing the release spring in the pad spring so as to prevent the return spring from coming off. Accordingly, the pair of pad plates can be smoothly returned to the original position, .

In addition, the return spring is prevented from being released, the service life of the return spring is improved as compared with the conventional case, and the unnecessary cost of the user can be reduced.

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;
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a disc brake, and more particularly,
3 is a partial perspective view showing a state in which a return spring provided in a disc brake according to a preferred embodiment of the present invention is supported by a pad spring.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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

A disc brake 10 according to an embodiment of the present invention includes a pair of pad plates 21 and 22 for pressing both sides of a disc D rotating together with a wheel (not shown) A carrier 30 in which the first and second pad plates 21 and 22 are provided so as to be movable forward and backward, a caliper housing 40 movably installed in the carrier 30 for operating the pair of pad plates 21 and 22, The pad spring 50 and the pair of pad plates 21 and 22 interposed between the carrier 30 and the pad plates 21 and 22 and the pair of pad plates 21 and 22 are slidably moved in the direction And a return spring (60) for providing an elastic force.

A friction pad 23 is attached to the inner surface of the pair of pad plates 21 and 22 so as to be frictionally engaged with the disk D. The pad plates 21 and 22 The projecting portion 24 is formed to support the sliding movement of the wiper blade. At this time, the pair of pad plates 21 and 22 are made of an inner pad plate 21 arranged to be in contact with the piston 41, which will be described later, and an outer pad plate 22 arranged in contact with a fingering 42, Respectively. The protrusion 24 of the pair of pad plates 21 and 22 is formed with a through hole 25 in which a return spring 60 is installed. The through holes 25 are formed in the advancing and retreating directions of the pair of pad plates 21 and 22. The coupling structure in which the return spring 60 is provided in the through hole 25 will be described below again.

The carrier 30 is engaged with a knuckle (not shown) of the vehicle body so as to be positioned on one side of the outer periphery of the disk D. Slide grooves 34 are formed in the inner side portions of the carrier 30 at positions corresponding to the projections 24 formed on both side surfaces of the pair of pad plates 21, At this time, each slide groove 34 is formed in front of and behind the carrier 30 so that a pair of pad plates 21 and 22 are respectively installed. That is, as shown in the drawing, the slide grooves 34 formed on both side portions of the carrier 30 are spaced apart from each other by a predetermined distance, and the disk D is opened to be smoothly inserted and positioned at the center thereof.

The projecting portion 24 is engaged with the slide groove 34 so that the pair of pad plates 21 and 22 slide along the slide groove 34 of the carrier 30. That is, when each of the pad plates 21 and 22 is advanced and retreated along the slide groove 34, the friction pads 23 are brought into close contact with both sides of the disk D, thereby generating a braking force.

The caliper housing 40 is movably installed in the carrier 30 as the guide rods 45 provided at both ends thereof are inserted into guide holes 35 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 21 can be moved forward and backward and a fingering 42 for pressing the outer pad plate 22 do.

A piston (41) is provided in the cylinder (43) so as to be movable forward and backward. The piston 41 presses the inner pad plate 21 while advancing when a braking oil pressure is applied to the cylinder 43.

The pad spring 50 is mounted on the carrier 30 and supports the pair of plates 21 and 22 to slide. That is, the pad springs 50 are formed as a pair and are respectively installed at both inner ends of the carrier 30 to support both sides of the pair of pad plates 21 and 22, respectively. The pad spring 50 is formed by bending a plurality of times so as to have a shape corresponding to the inner surface of the carrier 30 and is in close contact with the inner surface of the carrier 30, To support the lower ends of the plates (21, 22). The pad spring 50 is provided with a separation preventing portion 55 for preventing the return spring 60, which will be described later, from being separated from the pad plates 21 and 22. The departure prevention portion 55 will be described below again.

The pad plates 21 and 22 of the disk brake 10 having the above structure are provided with elastic forces on the pad plates 21 and 22 so that the pad plates 21 and 22 are smoothly returned A return spring 60 is provided.

The return spring 60 is inserted into the through hole 25 formed in the projection 24 of each of the pad plates 21 and 22 so that the pair of pad plates 21 and 22 are connected to each other Thereby providing an elastic force so as to move in a direction away from the center. 2, the return springs 60 are provided at both ends of the pair of pad plates 21 and 22, which are formed as a pair.

More specifically, the return spring 60 is provided on the protruding portion 24 formed on both sides of the pair of pad plates 21 and 22 so that the pair of pad plates 21 and 22 are moved in a direction away from the disc D So as to be elastically supported. The return spring 60 includes a pair of rods 61 inserted into the through holes 25 of the protruding portion 24 facing each other and a pair of pressing portions 63 bent and extended from the pair of rods 61 And a connecting portion 65 for connecting the pair of pressing portions 63 with each other. The return spring 60 may be formed of a single body having a predetermined length and may be bent a plurality of times.

The length of the rod 61 corresponds to the length of the through hole 25 or the length of the through hole 25 is set to be the same as the length of the through hole 25, Can be formed longer. This is to prevent the rod 61 from coming off the through hole 25 when the pad plates 21 and 22 are operated. The diameter of the rod 61 may be smaller than the diameter of the through-hole 25.

A pair of pressing portions 63 extend from the respective rods 61 in the vertical direction so as to contact the pad plates 21 and 22. Further, a pair of pressing portions 63 are provided so as to be disposed between the pair of pad plates 21, 22. This is to allow the pad plates 21, 22 to be pressed by the pad plates 21, 22 when moving back and forth. That is, the pressing portion 63 is elastically deformed as it is pressed by the pad plates 21 and 22, and when the pad plates 21 and 22 return to their original positions, Direction.

The supporting portion 62 is formed between the pressing portion 63 and the rod 61 so as to be in contact with the protruding portion 24 so that the pressing portion 63 is stably pressed. At this time, the support portion 62 is shown as being bent in the horizontal direction orthogonal to the pressing portion 63, but it is not limited thereto, and it may be bent in any direction as long as it can come into contact with the pad plates 21, 22. The support portion 62 is provided to be bent between the rod 61 and the pressing portion 63 to prevent the rod 61 from being caught in the through hole 25 when the pad plates 21 and 22 are moved back and forth. .

The connecting portion 65 is formed so that a portion connected to the pressing portion 63 is bent so that a bending moment due to the elastic deformation of the pressing portion 63 is minimized so that a pair of pressing portions 63 are connected.

It is obvious that the return spring 60 is installed so as not to interfere with the disc D positioned between the pair of pad plates 21 and 22 during the elastic deformation according to the operation of the pad plates 21 and 22.

According to an embodiment of the present invention, the return spring 60 is prevented from being separated from the pad plates 21 and 22 by the separation preventing portions 55 provided on the pad springs 50. More specifically, referring to FIG. 3, the release preventing portion 55 is formed by bending a cut portion of a part of the pad spring 50. The release preventing portion 55 is provided at the upper end of the return spring 60, that is, at the upper end of the connecting portion 65 to support the upper side of the connecting portion 65. Although the release preventing portion 55 is shown as having a hook shape to enclose a part of the connection portion 65, the release preventing portion 55 is not limited to this, The number and the shape of the separation preventing portions 55 can be freely changed if they are provided on the upper side and are formed to support the connecting portions 65. [

As a result, since the upper end of the return spring 60 is supported by the release preventing portion 55 and the rod 61 located at the lower end of the return spring 60 is inserted and supported in the through hole 25, 60 are prevented from being released. That is, even if the amount of deformation of the return spring 60 increases as the travel distance of the pad plates 21 and 22 increases due to wear of the friction pad 23, the return spring 60 is disengaged from the pad plates 21 and 22 Is prevented.

The operation of the return spring 60 according to the operation state of the disc brake 10 according to the preferred embodiment of the present invention will now 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 41 presses the inner pad plate 21 toward the disk D side. When the friction pad 23 of the inner pad plate 21 is brought into close contact with one side surface of the disk D, the caliper housing 40 is moved in the direction opposite to the moving direction of the piston 41 by the reaction force of the advancement of the piston 41 It is pushed. At this time, the fingering member 42 pulls the outer pad plate 22 toward the other side of the disk D so that the friction pad 23 of the outer pad plate 22 contacts the friction pad 23 of the inner pad plate 21 A braking force is generated while being closely attached to the disc D.

At this time, the return spring 60 mounted on the protrusion 24 formed on both sides of the pair of pad plates 21 and 22 elastically deforms to provide an elastic force to the pad plates 21 and 22. That is, when the braking oil pressure applied to the cylinder 43 is removed, the piston 41 is retracted in the direction opposite to the disk D and the caliper housing 40 is returned to the original position, (D). Accordingly, the pair of pad plates 21 and 22 are smoothly returned to their original positions by the elastic force generated by the return spring 60.

Even if the return spring 60 is elastically deformed, the return spring 60 is prevented from being detached from the pad plates 21 and 22 as it is supported by the separation preventing portion 55 of the pad spring 50 fixed to the carrier 30.

As a result, in the disc brake 10 according to the embodiment of the present invention, the return spring 60 is provided so as to receive the elastic force in a direction in which the pair of pad plates 21 and 22 are moved away from each other, . Particularly, a position for providing a returning elastic force of the pad plates 21 and 22 is formed between the pair of pad plates 21 and 22 in the vicinity of the sliding portion of the pad plates 21 and 22, that is, Accordingly, it is possible to prevent the friction pads 23 from being unevenly worn by minimizing the size of the moment that the pad plates 21 and 22 rotate, and to prevent noise and vibration from occurring.

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 brake 21, 22: Pad plate
24: protrusion 25: through hole
30: carrier 40: caliper housing
50: Pad spring 55:
60: return spring 61: rod
63: pressing portion 65:

Claims

A pair of pad plates which are respectively pressed on opposite sides of a disk rotating together with the wheel, a carrier having a slide groove formed in both sides of the pad plate so that the pair of pad plates can move forward and backward, And a caliper housing movably mounted on the carrier and operating the pair of pad plates,
A through hole is formed in each of the protrusions in a retracting direction of each pad plate,
And a return spring installed on the through hole to provide an elastic force in a direction in which the pair of pad plates are separated from each other.

The method according to claim 1,
The return spring,
A pair of rods respectively inserted into the through holes of the opposed protrusions;
A pair of pressing portions which are bent from the pair of rods and are pressed by the projections in accordance with the forward and backward movement of the pad plate; And
And a connecting portion connecting the pair of pressing portions.

3. The method of claim 2,
Wherein the support portion is formed with a bent portion between the pressing portion and the rod so as to press the pressing portion stably against the protrusion and to prevent the rod from being pinched in the through hole.

3. The method of claim 2,
And the pair of pressing portions are arranged to be disposed between the pair of pad plates.

The method according to claim 1,
A pad spring interposed between the carrier and the pair of pad plates to slidably support the pair of pad plates is provided,
Wherein the pad spring is provided with a release preventing portion to prevent the return spring from being released.

6. The method of claim 5,
Wherein the release preventing portion is formed by bending a portion of the pad spring that is cut by cutting a part of the pad spring.

6. The method of claim 5,
And the release preventing portion is provided at an upper end of the return spring and is provided to support the upper side of the return spring.