Brake clearance manual adjusting arm device with umbrella tooth structures arranged at two ends of worm

Abstract

The invention discloses a brake clearance manual adjusting arm device with umbrella tooth structures arranged at two ends of a worm. Elastic material working holes with angles are arranged on two fitting surfaces of the worm as well as the front end and the back end of an adjusting arm shell; the umbrella tooth structures at two ends of the worm fit with the elastic material working holes; self-locking is performed on the umbrella tooth structures of the worm by the elastic material at two ends of the shell; and since rigid hardness of the worm is higher than hardness of the adjusting arm shell, for a rack of the umbrella tooth structures on the worm and fitting surfaces of the adjusting arm shell, in an impact process of braking force and reverse braking force, the fitting surfaces of the adjusting arm shell is impacted by the toothed rack of the umbrella tooth structures on the worm to form a gear groove symmetrical with the toothed rack of the umbrella tooth structures. The brake clearance manual adjusting arm device has the advantages of long service life, quick braking, rapid return and convenience in adjustment; assembly is free of restraint on a braking force direction; synchronous motion of the adjusting arm shell and a turbine is implemented; frequent changing is avoided; and sensitivity, reliability and safety of a brake system are further improved.

Description

technical field [0001] The invention relates to a braking gap manual adjustment arm device with bevel tooth structures arranged at both ends of a worm in an automobile braking system. Background technique [0002] In the existing automobile brake system, the automobile brake adjustment arm is mainly composed of the adjustment arm housing, the worm gear, the worm and other components. By adjusting the worm to rotate the worm gear, the cam is driven to rotate, and the redundant friction between the friction lining and the brake drum is eliminated. Clearance, in order to achieve the best braking effect, the adjustment arm is also responsible for the transmission of braking torque, braking and return functions, so it is required to be self-locking during the work process, and requires a relatively high service life. However, the existing adjusting arm generally adopts the self-locking of the adjusting shaft, and its service life is very short. The internal worm gear, worm and lo...

AI Technical Summary

Problems solved by technology

However, the existing adjusting arm generally adopts the self-locking of the adjusting shaft, and its service life is very short. The internal worm gear, worm and locking device mechanisms often fail to self-lock, resulting in the inability of the worm gear and the brake adjusting arm housing to move synchronously. When the vehicle is braking, it will not stop in time after deceleration, and it will not be able to fully return to its position at the end of braking. This will cause hidden dangers in driving. Therefore, this part must be replaced frequently, resulting in unnecessary waste

The self-locking failure is mainly caused by the following factors: In the existing automobile brake system, the automobile brake adjustment arm is mainly composed of the adjustment arm housing, the turbine, the worm and other components. The diameter of the circle and the pressure angle of the helix are the same. During the process of overlapping the transmission torque of the two, due to the frequent reciprocating braking impact of the worm on the turbine, the turbine will have a reverse thrust on the adjustment shaft, causing the adjustment shaft to rotate backwards, making the brake clearance Larger, longer braking distance, braking failure

Its reverse rotation force is irresistible to the general shaft type "locking" device, which will destroy the shaft type "locking" device in a short time

Automobile manufacturers have been researching this problem for a long time, and there have been several "locking" devices with different structures on the market. The basic "locking" object is the adjustment shaft, so that the adjustment shaft cannot rotate backwards during the braking process of the car. , but during the braking process, due to the severe impact of the braking reverse thrust of the turbine on the worm and the adjustment shaft, frequent reciprocation, damage to the locking device on the adjustment shaft, and even directly damage the housing of the adjustment arm

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