Self-adjustable servo type service drum brake with parking function

Abstract

The invention discloses a self-adjustable servo type service drum brake with parking function. A parking brake device is additionally arranged on a self-adjustable servo type drum brake assembly, according to the parking brake device, a parking pull arm is hinged to a through hole formed in the upper part of a rear tendon of a rear brake shoe assembly through a pull arm pin, and is fixed and limited through a retainer ring at a hinge joint of the through hole; and grooves are formed in the middle of the parking pull arm and the middle of a front tendon of a front shoe assembly, the two ends ofa parking push plate are correspondingly arranged at the middle of the parking pull arm and the groove in the middle of the front tendon of the front shoe assembly, one end of a parking inhaul cableis connected to the lower end of a brake pull arm, and the other end of the parking inhaul cable penetrates through a brake bottom plate assembly to be connected to a hand brake end of a vehicle chassis. According to the self-adjustable servo type service drum brake with the parking function, a vehicle with a servo type drum brake can realize manual parking, the cost for independently developing aparking device is saved, and the reliability is high.

Description

technical field [0001] The invention relates to a hydraulically actuated self-energizing drum brake with gap self-adjusting function, in particular to a self-energizing drum brake requiring hand braking for parking. Background technique [0002] Hydraulic self-energizing drum brakes are mostly used on engineering vehicles and trailers with heavy loads and slow speeds. The brakes are required to be effective and stable. Self-energizing drum brakes with clearance self-adjusting functions can well meet the requirements. Vehicle use requirements. [0003] However, the working environment of conventional engineering vehicles or trailers is relatively harsh. It may be on steep mountain roads or on uneven construction sites. High dynamic efficiency and good reliability. However, the mechanical parking (handbrake) device of this type of car is often realized by a separate device, which will lead to: [0004] 1. The cost is relatively high: the separate design of the mechanical pa...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the waste of resources and costs caused by the separate design of the hand parking brake device in the prior art, the purpose of the present invention is to propose a self-adjustable self-energizing driving drum brake with a parking function. The self-energizing drum brake is added with a mechanical brake device on the basis of the conventional service braking function, so that vehicles using self-energizing drum brakes can directly use a set of brakes to realize driving and braking at the same time. There are two functions of parking, and the direct use of this structure for parking will not affect the original service brake, which can save cost and space

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