KR101694054B1

KR101694054B1 - Drum brake for vehicle

Info

Publication number: KR101694054B1
Application number: KR1020150126738A
Authority: KR
Inventors: 조희진
Original assignee: 현대자동차주식회사
Priority date: 2015-09-08
Filing date: 2015-09-08
Publication date: 2017-01-06

Abstract

The brake shoe includes a brake drum rotated together with a wheel of an automobile and a trailing shoe and a leading shoe disposed to face each other inside the brake drum. The brake shoe operates forward and backward in the inner peripheral direction of the brake drum. And a wheel cylinder integrally provided at an anchor connected to each other at positions where the shoe and the leading shoe are opposed to each other, wherein the brake shoe is installed along the width direction on the inner surface of the trailing shoe and the leading shoe And a groove groove formed at an upper end of the trailing shoe adjacent to the anchor and at a lower end of the leading shoe.

Description

[0001] DRUM BRAKE FOR VEHICLE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automotive drum brake, and more particularly, to an automotive drum brake capable of optimizing a damping ratio.

Generally, the brake system of a vehicle acts to decelerate or stop a traveling vehicle. This is because a hydraulic braking device that brakes the hydraulic pressure generated by the operation of the brake pedal or a large braking force An exhaust brake to be used when necessary, or an air brake to generate braking force using the pressure of compressed air.

Among the hydraulic brakes, the brake mechanism that generates the braking force by receiving the hydraulic pressure from the master cylinder is structurally divided into a drum brake and a disk brake, and the operation of the drum brake will be described next. Respectively.

First, when the driver depresses the brake pedal, the drum brake applies the hydraulic pressure generated in the master cylinder to the wheel cylinder constituting the drum brake.

Then, when the piston inside the wheel cylinder is pushed outward to push the brake shoe, which is in contact with the piston, in the drum radial direction to seat the brake shoe on the drum, the brake lining padded on the brake shoe generates a friction force with the drum The braking force is generated.

At this time, the brake shoe provided on the right and left sides in the drum is fixed to the drum through the spring to return to the initial position. Here, the brake shoe has a structure in which the surface pressure of the piston on the anchor side is high and the surface pressure is decreased on the cylinder side I have.

Therefore, it is important that the drum brake be provided with a brake shoe to which the damping effect is applied according to the unstable surface pressure distribution when the braking force is generated, so that the damping ratio is optimized.

Korean Patent Publication No. 10-2009-0008672 (2009.02.22.).

An object of the present invention is to provide an automotive drum brake capable of optimizing a damping ratio by applying an asymmetric groove groove having a different size to a region having a large surface pressure and a small region with respect to a brake shoe.

The drum brake for an automobile according to the present invention includes a brake drum rotated together with a wheel of an automobile and a trailing shoe and a leading shoe disposed to face each other inside the brake drum, A brake shoe, and a wheel cylinder integrally provided on an anchor connected to the trailing shoe and the leading shoe, respectively, wherein the brake shoe is integrally formed with the trailing shoe and the leading shoe, And a groove groove formed at an inner side of the trailing shoe adjacent to the anchor and formed at a lower end of the leading shoe.

According to another aspect of the present invention, there is provided an automotive drum brake comprising a trailing shoe and a first longitudinal groove formed along an inner surface of the leading shoe in a longitudinal direction, And a second flute formed on an inner surface of the leading shoe and spaced apart from the first flute, the second flute being disposed adjacent to an inner side of the brake drum.

The second flutes may have an inner width and a depth greater than the first flutes.

Here, the first longitudinal groove and the second longitudinal groove are formed so that the inner width and the depth gradually increase from the wheel cylinder side toward the anchor side.

On the other hand, the groove groove is formed such that its inner width and depth gradually increase from the outer side to the inner side of the brake drum.

The present invention has the effect of optimizing the damping ratio of the drum brake by applying an asymmetric groove groove having a different size to a region having a large surface pressure and a small region with respect to the brake shoes.

Further, the present invention has the effect of improving the noise of the drum brake by relatively increasing the inner width and depth of the groove groove in a region where the surface pressure is small in the region where the surface pressure is large.

1 is a view showing a lateral pressure distribution of an automotive drum brake according to an embodiment of the present invention.
2 is a view showing a longitudinal pressure distribution of a drum brake for a vehicle according to an embodiment of the present invention.
3 is a view showing an installation position of a groove groove of a drum brake for a vehicle according to an embodiment of the present invention.
4 is an enlarged view of a groove groove formed in a trailing shoe of an automotive drum brake according to an embodiment of the present invention.
5 is a view showing a first longitudinal groove and a second longitudinal groove of an automotive drum brake according to an embodiment of the present invention.

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

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

It should be understood, however, that the present invention is not limited to the embodiments disclosed herein but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a view showing a lateral pressure distribution of a car drum brake according to an embodiment of the present invention, and FIG. 2 is a view showing a longitudinal pressure distribution of a car drum brake according to an embodiment of the present invention.

First, a car drum brake according to the present invention includes a brake drum 100, a brake shoe 200, and a wheel cylinder 300.

The brake drum 100 rotates together with the wheels of the automobile.

The brake shoe 200 includes a trailing shoe 210 and a leading shoe 220 which are provided on a back plate 10 fixed to an axle and installed inside the brake drum 10 to face each other.

The brake shoe 200 is operated forward and backward in the inner circumferential direction of the brake drum 100 by the elastic spring 20 connecting the trailing shoe 210 and the inner surface of the leading shoe 220.

The wheel cylinder 300 is integrally formed with an anchor 400 connected to the trailing shoe 210 and the leading shoe 220 at opposite positions.

Here, as shown in FIG. 1, in the automotive drum brake, the lateral pressures acting on the trailing shoe 210 and the leading shoe 220 are differently distributed due to an increase in contact rigidity.

That is, the trailing shoe 210 and the leading shoe 220 have a structure in which the surface pressure on the side of the anchor 400 is high and the surface pressure is reduced toward the wheel cylinder 300. This is because the instability of the surface pressure distribution causes the braking noise .

To this end, in the present embodiment, groove grooves H are provided in the trailing shoe 210 and the leading shoe 220, respectively, so that the surface pressure distribution can be stabilized.

The groove groove H is provided along the width direction on the inner surfaces of the trailing shoe 210 and the leading shoe 220 and is formed so as to be parallel to the upper end of the trailing shoe 210 adjacent to the anchor 400, Respectively.

This is to improve the structure in which the surface pressure of the trailing shoe 210 and the leading shoe 220 is high on the side of the anchor 400 and decreases on the side of the wheel cylinder 300. That is, 400 to improve the damping ratio of the drum brake according to the present invention and to improve the noise.

Meanwhile, as shown in FIG. 2, in the automotive drum brake, longitudinal pressure acting on the trailing shoe 210 and the leading shoe 220 is distributed differently due to an increase in contact rigidity.

That is, in the brake shoe 200, since the contact rigidity increases toward the inner side of the brake drum 100, the surface pressure is increased, and the structure is disadvantageous to braking noise due to unstable surface pressure distribution.

A detailed description will be given later on with reference to FIG. 3 to FIG. 5 to stabilize the surface pressure distribution in the longitudinal direction acting on the trailing shoe 210 and the leading shoe 220.

FIG. 3 is a view showing an installation position of a groove groove of an automotive drum brake according to an embodiment of the present invention. FIG. 4 is a perspective view showing a groove groove formed in a trailing shoe of an automotive drum brake according to an embodiment of the present invention. FIG.

3, the brake shoe 200 has a groove groove H formed at the upper end of the trailing shoe 210 adjacent to the anchor 400 and at the lower end of the leading shoe 220, respectively.

The groove groove H is formed so as to have an inner width and a depth larger toward the inner side from the outer side of the brake drum 100.

In the case of the drum brake according to the present invention as described above with reference to FIG. 2, since the contact rigidity increases toward the inner side of the brake drum 100 to increase the surface pressure, The width and depth of the groove H are made different from each other so that the surface pressure distribution becomes uniform.

4, the groove groove H is formed at one end coupled to the back plate 10 so as to extend in the width direction of the brake drum 100 toward the inside of the brake drum 100. In other words, as shown in FIG. 4, So that the pressure inside the brake drum 100 applied with a relatively high pressure can be dispersed.

Accordingly, the groove groove H according to the present embodiment can increase the damping ratio of the automotive drum brake, and as a result, can effectively improve the noise.

5 is a view showing a first longitudinal groove and a second longitudinal groove of an automotive drum brake according to an embodiment of the present invention.

As shown in FIG. 5, the automotive drum brake further includes a first flute 500 and a second flute 600.

First, the first flute 500 is formed along the longitudinal direction at the inner surface of the trailing shoe 210 and the leading shoe 220, and is installed adjacent to the outer side of the brake drum 100.

The first flutes 500 are preferably formed as a pair on the inner surfaces of the trailing shoe 210 and the leading shoe 220, but may be set as needed.

The second vertical groove 600 is formed on the inner surface of the trailing shoe 210 and the leading shoe 220 so as to be spaced apart from the first vertical groove 500 and is disposed adjacent to the inner side of the brake drum 100.

The second vertical grooves 600 are formed in the same pair as the first vertical grooves 500 and have a larger inner width and a larger depth than the first vertical grooves 500.

This is because the inner side of the brake drum 100 is a region where the surface pressure is larger than the outer side so that the inner width and the depth of the second flute 600 are relatively increased to disperse the pressure against the inside of the brake drum 100 to be.

The first vertical groove 500 and the second vertical groove 600 are formed so that the inner width and the depth gradually increase toward the anchor side 400 from the wheel cylinder 300 side.

1, the surface pressure of the drum brake on the side of the anchor 400 is high and the surface pressure on the side of the wheel cylinder 300 is low, as shown in FIG. 1. In other words, in the case of the first vertical groove 500 and the second vertical groove 600, The inner width and depth of the first vertical groove 500 and the second vertical groove 600 located on the anchor side 400 are made larger than those of the wheel cylinder 300 so that the lateral direction of the drum brake 300 It is possible to make the surface pressure distribution to be constant.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many modifications may be made thereto, It will be understood that all or some of the elements (s) may be optionally constructed in combination. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: back plate 20: elastic spring
100: Brake drum 200: Brake shoe
210: trailing shoe 220: leading shoe
300: Wheel cylinder 400: Anchor
500: first vertical groove (600): second vertical groove
H: groove groove

Claims

A brake drum rotating with the wheels of the vehicle;
A brake shoe including a trailing shoe and a leading shoe disposed opposite to each other in the brake drum, the brake shoe moving forward and backward in an inner peripheral direction of the brake drum; And
And a wheel cylinder integrally formed with the anchors connected to the trailing shoe and the leading shoe,
The brake shoes (1)
And a groove groove formed in an inner side surface of the trailing shoe and the leading shoe, the groove being formed at an upper end of the trailing shoe and a lower end of the leading shoe adjacent to the anchor,
A first vertical groove formed along the longitudinal direction at an inner surface of the trailing shoe and the leading shoe, the first vertical groove being provided adjacent to an outer side of the brake drum; And
And a second vertical groove formed on an inner surface of the trailing shoe and the leading shoe so as to be spaced apart from the first vertical groove and adjacent to an inner side of the brake drum. .

delete

The method according to claim 1,
The second vertical groove
And an inner width and a depth of the inner circumferential surface are larger than an inner circumferential width and a depth of the first circumferential groove.

Claim 1:
Wherein the first flutes and the second flutes are formed in a substantially rectangular shape,
And an inner width and a depth are gradually increased gradually from the wheel cylinder side toward the anchor side.

The method according to claim 1,
The groove groove
Wherein an inner width and a depth of the brake drum are gradually increased from the outer side toward the inner side of the brake drum.