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Wedge actuating drum type brake

A drum brake and actuation technology, applied in the direction of hydraulic drum brake, drum brake, brake type, etc., can solve the troublesome task of disassembling the hub and brake drum assembly, uneven wear of the lining, and the inability of the piston 42 full use of

Inactive Publication Date: 2003-09-17
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, only one lining needs to be replaced frequently due to the uneven wear of the two linings
In addition, the dismantling task of the wheel hub and brake drum assembly is cumbersome when changing the lining
[0011] In addition, in the slave shoe 30, the force of the piston 42 cannot be fully utilized due to the drop in expansion force, thereby reducing the overall performance of the drum brake

Method used

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  • Wedge actuating drum type brake
  • Wedge actuating drum type brake
  • Wedge actuating drum type brake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Such as image 3 As shown, when forming the two slopes 41 and 42 of the support wedge 43 , the inclination angle on the side of the trailing shoe 30 is larger than that on the side of the leading shoe 20 .

[0021] Such as Figure 4 As shown, the inclination angles θ1 and θ2 with respect to the axis of the wedge 43 are made θ1<θ2, and the inclination angles of the end faces of the two pistons 41 and 42 are also different to correspond to the inclination angle of the wedge 43 .

[0022] Balls 44 and 45 are placed between wedge 43 and pistons 41 , 42 as in conventional techniques.

[0023] As mentioned above, in the conventional method, the forces F1 and F2 of the pistons 41 and 42 are respectively: F1=F / 2*tanθ1, F2=F / 2*tanθ2, therefore, if θ1<θ2, then F1

[0024] That is to say, if the inclination angle becomes larger, the thrust force of the pistons also becomes larger. Therefore, the thrust force of the piston 42 associated with the slave shoe 30 is greater than ...

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PUM

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Abstract

The present invention discloses a wedge actuated drum brake for a motor vehicle. A vertically descending support wedge pushes out a pair of pistons of the wheel brake cylinder, so that the leading shoe and the trailing shoe are pressed against the inner periphery of the brake drum 10 . Among them, the inclination angle of the support wedge on the slave hoof side is larger than the inclination angle on the leading hoof side, therefore, the inclination angles of the two piston end surfaces facing the supporting wedge are different, which strengthens the expansion force of the slave hoof. As a result, the leading hoof and the slave hoof The expansion force of the hoof is the same.

Description

technical field [0001] The present invention relates to a drum brake for a motor vehicle, and more particularly to a wedge-actuated drum brake in which the piston of the wheel brake cylinder is driven by a supporting wedge. Background technique [0002] Such as figure 1 As shown, the conventional drum brake includes a pair of brake shoes 20 and 30, which are hinged to the brake base plate in the drum brake 10; , 30 are pressed against the inner circumference of the brake drum 10 . [0003] The wheel cylinder 40 is provided with a pair of pistons 41 and 42 which push the brake shoes 20 and 30 toward the inner periphery of the brake drum 10 . These two pistons 41 and 42 are pneumatically or hydraulically driven, or pushed out by steel balls 44 and 45 between the two inclined surfaces of the support wedge 43 and the pistons 41 and 42 . The two inclination angles θ1 and θ2 of the support wedge are equal. On the other hand, the pistons 41 and 42 can also be pushed out by S-sh...

Claims

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Application Information

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IPC IPC(8): F16D51/24F16D51/00F16D65/14F16D65/22
CPCF16D65/22F16D2121/14F16D2125/66F16D51/00
Inventor 全钟哲
Owner HYUNDAI MOTOR CO LTD
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