KR20160076678A

KR20160076678A - Parking brake

Info

Publication number: KR20160076678A
Application number: KR1020140186997A
Authority: KR
Inventors: 조준근
Original assignee: 주식회사 만도
Priority date: 2014-12-23
Filing date: 2014-12-23
Publication date: 2016-07-01

Abstract

The parking brake is started. According to an aspect of the present invention, there is provided a brake system comprising: a drum that rotates together with a wheel of a vehicle; first and second brake shoes respectively installed on both inner sides of the drum; and first and second brake shoe An operating lever mounted on a back plate coupled to the vehicle body and having an end supported by one end of each of the brake shoe, An adjuster which is disposed between the other side of the first and second brake shoe to compensate an interval between the drum and the brake shoe and an adjuster which connects the first and second brake shoes to each other when the brake is released, And a return spring for returning the brakes to the brakes, wherein the first and second brakes A parking brake may be provided that includes an elastic member coupled to each end of the other side of the shoe.

Description

Parking brake

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake, and more particularly, to a parking brake for assisting a return of a brake shoe when releasing a brake.

Generally, a parking brake is a device for stopping the vehicle from moving when parking the vehicle, and serves to prevent the wheel of the vehicle from rotating. Such a parking brake is used as a DIH (Drum In Hat) type brake device. Normally, when a hand brake or a foot brake is operated, a parking brake cable is pulled to generate a braking force. At this time, the DIH type brake is a type of brake which is used in combination with the disc brake for the rear wheel braking by hydraulic pressure when the drum brake is used as the parking brake. That is, the DIH type brake is provided with a drum brake inside a hat-shaped disk, and is disclosed in Korean Patent Publication No. 10-2010-0018306.

The DIH parking brake includes a drum that rotates together with a wheel of the vehicle, a first brake shoe and a second brake shoe which are installed inside the drum and brake the drum through friction with the inner surface of the drum, An operation lever for pushing the two brake shoes on both sides toward the inner surface of the drum when the parking cable associated with the parking lever of the driver's seat is pulled out, an anchor for contacting one end of the two brake shoes, And an adjuster disposed between the other sides.

Such a parking brake causes the two brake shoes to move outwardly toward the inner side of the drum through the operating lever, thereby frictionally raising the two brake shoes against the inner surface of the drum to generate parking force. At this time, between one end of the two brake shoe, there are provided an operation lever for pushing each brake shoe toward the inner surface of the drum so as to friction with the drum, and an anchor for supporting each brake shoe. Between the other end of the two brake shoes, Are arranged. At this time, when releasing the brake of the parking brake, the brake shoes return to their original positions by the return spring connecting the pair of brake shoes.

However, when the braking action is performed on the downhill or downhill road by using the DIH type parking brake as described above, the two brake shoes closely attached to the inner circumferential surface of the drum due to gravity due to the weight of the vehicle, However, when the braking operation is not performed smoothly, a drag phenomenon may occur which generates a residual braking force.

KR Patent Publication 10-2010-0018306 (Hyundai Motor Company) 2010. 02. 17.

The parking brake according to the embodiment of the present invention can return the two brake shoe displaced when releasing the brake so that the brake shoes can be returned to their original positions.

According to an aspect of the present invention, there is provided a brake system comprising: a drum that rotates together with a wheel of a vehicle; first and second brake shoes respectively installed on both inner sides of the drum; and first and second brake shoe An operating lever mounted on a back plate coupled to the vehicle body and having an end supported by one end of each of the brake shoe, An adjuster which is disposed between the other side of the first and second brake shoe to compensate an interval between the drum and the brake shoe and an adjuster which connects the first and second brake shoes to each other when the brake is released, And a return spring for returning the brakes to the brakes, wherein the first and second brakes A parking brake may be provided that includes an elastic member coupled to each end of the other side of the shoe.

Further, the first and second brake shoe may each have an arc-shaped rim having a lining on the outer circumferential surface thereof and a web supporting the inner circumferential surface of the rim, and the elastic member may be provided on the rim of the first and second brake shoes As shown in FIG.

Further, the elastic member may be formed in a shape of arc, and grooves may be formed at both ends to fit the rims of the first and second brake shoe.

Further, the elastic member may be fixed to the back plate.

The first and second brake shoes are deformed in accordance with a displacement of the first and second brake shoes in a direction in which the drum rotates when the brake is applied to the brake shoes, Position.

In addition, the elastic member may be made of a rubber material having an elastic force.

The parking brake according to an embodiment of the present invention allows the brake shoes to return to their original positions by the elastic restoring force of the elastic members deformed as the two brake shoes are twisted from the center during the braking action, .

Further, since the elastic member is made of a rubber material, it is possible to select the size and rubber hardness of the elastic member according to the brake characteristics of each vehicle, so that the optimum restoration force level can be determined.

In addition, since the elastic member has a damping effect of vibration, rattle noise can be prevented.

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 a plan view showing a parking brake according to a preferred embodiment of the present invention.
2 is a partial perspective view illustrating a state of engagement of an elastic member and a brake shoe provided in a parking brake according to a preferred embodiment of the present invention.
FIG. 3 is an assembled perspective view of FIG. 2. FIG.
4 is a plan view showing a general operation state in a flat ground through a parking brake according to a preferred embodiment of the present invention.
5 is a plan view showing a state in which the brake shoes are twisted from the center and the elastic members are deformed when the parking brake is braked according to a preferred embodiment of the present invention.
6 is an enlarged view of a portion A in FIG.

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.

FIG. 1 is a plan view showing a parking brake according to a preferred embodiment of the present invention, FIG. 2 is a partial perspective view showing a state of engagement of an elastic member and a brake shoe provided in the parking brake, It is a perspective view.

1 to 3, the parking brake 100 includes a back plate 102 coupled to a knuckle portion (not shown) of a vehicle body and having a dust cover 103 attached to the periphery thereof to prevent foreign matter from entering the parking brake 100 And a cylindrical drum 101 installed to rotate together with a wheel (not shown) in front of the back plate 102.

Although not shown, a disk 101 is integrally formed at one end of the drum 101 so as to exhibit a braking force when the vehicle is traveling at a predetermined speed, And a disc brake for generating a braking force is provided.

A first brake shoe 110 and a second brake shoe 120 are installed on both sides of the drum 101 so as to brak through friction with the inner surface of the drum 101.

The first and second brake shoe 110 and 120 are mounted to be operable outwardly to a back plate 102 fixed to a knuckle portion (not shown) of the vehicle so as to face the drum 101. The two brake shoes 110 and 120 are provided on the outer surfaces of the rims 111 and 121 for friction between the rims 111 and 121 bent in a semicircular shape so as to correspond to the inner surface of the drum 101 and the inner surface of the drum 101, And includes webs 113 and 123 formed on the inner circumferential surface of the rims 111 and 121 for reinforcing the attached linings 112 and 122 and the rims 111 and 121. At this time, a brake shoe supporting device 104 is installed on each of the webs 113 and 123 to support the two brake shoes 110 and 120 such that the two brake shoes 110 and 120 can advance and retreat toward the inner surface of the drum 101 by a predetermined interval .

(Not shown) for a driver's operation through a parking cable (not shown) between the ends of the two brake shoes 110 and 120 and pushes one end of the two brake shoes 110 and 120 outwardly, An operating lever 130 for causing the lining 112 and 122 provided on the shoe 110 and 120 to be in close contact with the inner circumferential surface of the drum 101 to generate a braking force and an operating lever 130 for supporting one end of the two brake shoes 110 and 120, And an adjuster 150 is disposed between the other ends of the two brake shoes 110 and 120 so that an interval between the inner surface of the drum 101 and the lining 112 and 122 is maintained at a constant value or less Respectively. The two brake shoes 110 and 120 are provided at both ends of the brake shoes 110 and 120 with return springs 160 and 160 for returning the first and second brake shoes 110 and 120 to the original position ) Is installed.

The configuration of the parking brake as described above is a commonly used DIH type parking brake, which is a well-known technology, and thus a detailed description thereof will be omitted.

The parking brake 100 according to an embodiment of the present invention includes an elastic member 170 that helps each brake shoe 110, 120 to be restored to its original position when the brake is released. These elastic members 170 are engaged with the other end portions of the first and second brake shoes 110 and 1120, respectively. That is, it is installed on the other side of the brake shoe 110, 120 opposite to the operation lever 130 that operates the two brake shoes 110, 120 outwardly. More specifically, the elastic member 170 has an arc shape and grooves 171 are formed at both ends of the elastic member 170 so that the rims 111 and 121 of the first and second brake shoes 110 and 120 are fitted. Thus, the rims 111 and 121 of the brake shoe 110 and 120 are engaged with the groove 171, respectively. Further, the elastic member 170 is fixed to the back plate 102. The elastic member 170 is made of a rubber material having an elastic force.

The elastic member 170 serves to return the first and second brake shoes 110 and 120 to their original positions. 4, when the two brake shoes 110 and 120 are outwardly operated by the operating lever 130, the other end of each brake shoe 110 and 120 is displaced by a certain amount toward the elastic member 170 And presses the elastic member 170 as it occurs. When the brake is released, the brake shoes 110 and 120 are returned to their original positions by the resilient restoring force of the elastic member 170 together with the return spring 160.

In particular, the elastic member 170 allows each brake shoe 110, 120 to move to its original position when the brake shoes 110, 120 are twisted in the direction in which the drum 101 is rotated. For example, when the vehicle is parked on an inclined road or a downhill road, the first and second brake shoes 110 and 120 are operated outward through the operation lever 130 to press the brake shoes 110 and 120 in close contact with the inner surface of the drum 101, The vehicle is pushed a certain distance in an inclined direction by the weight of the vehicle. At this time, each of the brake shoes 110 and 120 is provided in a state of being in contact with the inner surface of the drum 101, so that the brake shoes 110 and 120 are moved by a certain distance in the rotating direction of the drum 101. That is, as shown in FIG. 5, the first and second brake shoes 110 and 120 are displaced in the direction in which the drum 101 is rotated with respect to the center line C, respectively. As the drum 101 rotates in the counterclockwise direction, the second brake shoes 120 generate displacement toward the elastic member 170 and press the elastic member 170. At this time, the first brake shoes 110 are displaced in the same direction together with the second brake shoe 120 but do not press the elastic member 170 as displacement occurs in a direction away from the elastic member 170. That is, the elastic member 170 is provided in a state of being fixed to the back plate 102, so that the elastic member 170 is divided into the first and second brake shoes 110 and 120 which are displaced without being separated from the center line C, . The elastic member 170 deformed by the second brake shoe 120 as described above is shown in Fig. Accordingly, when the brake is released, the second brake shoes 120 are pushed by the resilient restoring force of the deformed portion of the elastic member 170, so that the respective brake shoes 110 and 120 are moved to their original positions. Therefore, a drag phenomenon in which the inner surface of the drum 101 and the lining are unnecessarily rubbed by the bias of the brake shoes 110 and 120 is prevented.

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.

100: parking brake 101: drum
110: first brake shoe 120: second brake shoe
130: Operation lever 140: Anchor
150: Adjustment 160: Return spring
170: elastic member 171: groove

Claims

A first brake shoe provided on both inner sides of the drum, and a second brake shoe installed on both sides of the drum to rotate the first and second brake shoe toward the inner surface of the drum when the parking cable is pulled, An operating lever that is coupled to one end of one side of the first and second brake shoes; an anchor that is attached to a back plate coupled to the vehicle body and has one end of each brake shoe supported in contact with each other; An adjuster disposed between the drum and the brake shoes for compensating an interval between the drum and the brake shoe and a return spring connecting the first and second brake shoe and returning each brake shoe to an original position upon releasing the brake, In the brakes,
And an elastic member coupled to each of the other ends of the first and second brake shoe to assist in restoring each brake shoe to its original position upon releasing the brake.

The method according to claim 1,
Wherein the first and second brake shoes each have an arc-shaped rim having a lining on an outer circumferential surface thereof, and a web supporting an inner circumferential surface of the rim,
Wherein the elastic member is coupled to an end of a rim of the first and second brake shoes.

3. The method of claim 2,
Wherein the resilient member has an arc shape and grooves are formed at both ends of the elastic member to fit rims of the first and second brake shoe.

The method according to claim 1,
And the elastic member is fixed to the back plate.

5. The method of claim 4,
Wherein the first and second brake shoes are deformed in accordance with a displacement in a direction in which the drum is rotated from the center when the brake is applied to the brake shoes and when the brake is released, And the parking brake is applied to the parking brake.

The method according to claim 1,
Wherein the elastic member is made of a rubber material having an elastic force.