self boosting drum brake

Abstract

The invention discloses a self-energizing drum brake which comprises a first shoe plate, a second shoe plate, a parking pull arm, a wheel cylinder and a supporting block. Both the wheel cylinder and the supporting block are arranged between the first shoe plate and the second shoe plate. The two ends of the wheel cylinder abut against the first ends of the first shoe plate and the second shoe plate correspondingly. The two ends of the supporting block abut against the other ends of the first shoe plate and the second shoe plate correspondingly. The self-energizing drum brake is characterized in that the self-energizing drum brake further comprises an energizing arm and an energizing supporting rod; the end, abutting against the wheel cylinder, of the second shoe plate is provided with a kidney-shaped mounting hole; the parking pull arm and the energizing arm are arranged on the two sides of the second shoe plate correspondingly, and one ends of the parking pull arm and the energizing arm are hinged through a first pin roll mounted in the kidney-shaped mounting hole; the other end of the energizing arm abuts against the energizing supporting rod, and the other end of the energizing supporting rod is hinged to the end, close to the supporting block, of the first shoe plate; and the energizing arm is further hinged to the second shoe plate through a second pin roll. By adoption of the self-energizing drum brake, the problem that the parking torque is insufficient when a leading shoe and trailing shoe drum brake is used for parking can be effectively solved.

Description

technical field [0001] The invention relates to a brake, in particular to a self-energizing drum brake. Background technique [0002] At present, in the field of commercial vehicles and economical passenger vehicles, drum brakes are still widely used on the rear wheels; due to factors such as space and cost, it is common practice to integrate the parking mechanism into the driving drum brakes. The use of the same set of brakes saves a lot of cost, and at the same time, because the actuating mechanisms for parking and driving in the brakes are separated, independent safety is ensured. [0003] Among the drum brakes commonly used in the prior art, the performance of the leading shoe drum brake is better, and its structure is as follows: figure 1 As shown, its characteristic is that each of the two brake shoes has a fixed fulcrum 100, and when one shoe is opened under the action of the driving force of the wheel cylinder 200, the rotation direction is consistent with the rotat...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a self-energizing drum brake to solve the deficiencies in the prior art, which can effectively solve the problem of insufficient parking torque when the drum brake is parked with a leading shoe

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