Automobile braking gap automatic regulating arm

Abstract

An automatic brake gap adjustment arm for automobiles, the upper end of the adjustment arm body is hinged with a connecting fork through a pivot pin, one end of the connecting fork is threadedly connected with an automobile brake cylinder, and the other end is connected with an adjusting rod with a pivot pin; The arm body is equipped with a worm gear and a worm, and the spline shaft hole of the worm gear matches the spline of the automobile S-shaped camshaft; the worm is equipped with a thrust ring, a limited anti-reverse overrunning coupling, a spacer, a return spring, a driven ring, The shifting block is provided with a conjugated sawtooth-shaped end face on the driven ring and the shifting block respectively, and the end faces of the two parts match together to form a saw-tooth-shaped end face jaw-type one-way clutch; a notch is provided on the adjustment rod, The notch is matched with the radial boss of the shifting block. The invention is used for the automatic compensation of the brake gap of the automobile, and has the characteristics of low cost, compact structure, reliable action and long service life.

Description

technical field [0001] The invention relates to the technical field of brakes that transmit rotational motion, in particular to a mechanical tension adjustment device for automatically adjusting excessive gaps in one direction in automobile brakes. Background technique [0002] During the driving process of the car, due to wear and tear, the gap between the brake drum and the brake shoe is constantly increasing, resulting in an increase in the braking distance, prolonging the braking lag time, and reducing the braking sensitivity; Different wheel braking clearances will make the braking force of the two wheels uneven. When the car brakes, deviation and tail swinging will occur, which will affect driving safety. In order to solve this problem, many people have designed various automatic adjustment devices. , such as China's utility model patents CN2329807Y and CN2470607Y have proposed the technical scheme of the automatic adjustment of the brake clearance of the automobile. T...

AI Technical Summary

Problems solved by technology

[0002] During the driving process of the car, due to wear and tear, the gap between the brake drum and the brake shoe is constantly increasing, resulting in an increase in the braking distance, prolonging the braking lag time, and reducing the braking sensitivity; Different wheel braking clearances will make the braking force of the two wheels uneven. When the car brakes, deviation and tail swinging will occur, which will affect driving safety. In order to solve this problem, many people have designed various automatic adjustment devices. , such as China's utility model patents CN2329807Y and CN2470607Y have proposed the technical scheme of the automatic adjustment of the brake clearance of the automobile. The former adopts the adjustment main transmission gear coaxial with the worm gear. , the control pin is fixed on the car camshaft bracket; the main transmission gear meshes with the intermediate wheel, and there are active helical gears and booster springs coaxial with the intermediate wheel; the active helical gear meshes with the passive helical gear, and the passive helical gear and the worm are the same shaft, a clutch spring is arranged on the same shaft to form a one-way overrunning clutch; when the brake gap becomes larger due to shoe wear, the brake rotation angle exceeds the limit gap range set by the control hole, the main transmission gear is positioned, When the brake returns to the position, the relative rotational displacement is eliminated, and the brake clearance increased due to wear is adjusted through the clutch spring to achieve the purpose of automatically adjusting the shoe clearance

In this technical solution, because the one-way overrunning clutch is arranged at the rear of the entire transmission chain, that is, it is coaxial with the large worm, the torque it receives is large, and the component volume is also large; and the detection and perception is carried out by the gap between the control hole and the control pin And compensation, the accuracy is poor, because of the mechanical wear of holes and pins caused by frequent braking during the operation of the car, it is difficult to ensure correct adjustment; in view of the above problems, the designer once proposed a one-way overrunning clutch set in the entire transmission chain The front part makes it smaller in size, compact in structure, less in torque, reduces wear of parts, and operates accurately and reliably. It is a technical solution for the automatic adjustment device of automobile brake clearance, and has applied for a patent to the country (application number: 02155128.6). The technical effect of the scheme is better, but the processing is difficult and the cost is high; both technical schemes need to set a fixed reference point on the car, which increases the complexity of design and installation; the latter patent (notification number CN2470607Y) is approved by The worm gear transmission system in the body is equipped with a stop spring on the outer diameter of the worm tail, and a clutch spring is also installed at the front of the worm, forming two sets of one-way couplers with opposite directions; gears are connected to the worm shaft, The gear rack connected with the brake chamber constitutes the transmission rod system; when there is excessive clearance between the brake shoes and drums of the automobile, it can be adjusted during the braking process; because it is during the braking process, the adjustment arm adjusts the clearance. To bear a large load, the parts are easily damaged, which affects the life of the product

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