Wheel brake device

Abstract

The invention discloses a wheel brake device. The wheel brake device comprises a brake bottom plate. The top end of the brake bottom plate is in shaft connection with a swinging frame through a rotary shaft. The top end of the swinging frame is fixedly connected with a brake air chamber. A push rod of the brake air chamber is hinged to the upper end of a rocking arm. The lower end of the rocking arm is fixedly connected with a cam through a connecting shaft penetrating the swinging frame. The two ends of the connecting shaft are correspondingly and fixedly connected with the cam and the rocking arm through splines. The connecting shaft is rotationally connected with the swinging frame through a bearing. The cam, the connecting shaft, the swinging frame, the brake air chamber, the push rod and the rocking arm jointly form a suspended swinging frame mechanism. The whole suspended swinging frame mechanism can swing with the rotary shaft as the center. The lower end of the brake bottom plate is fixedly connected with a bearing plate through dowels. The left end and the right end of the bearing plate are correspondingly provided with semicircular through holes. The lower ends of two brake shoes are correspondingly embedded into the semicircular through holes in the left end and the right end of the bearing plate through dowels. The upper ends of the two brake shoes are matched with the cam.

Description

[0001] The application of the present invention is a divisional application of the parent application "Pneumatic drum type floating cam balance self-adjusting wheel brake". The application number of the parent application is 2016100490565, and the application date is January 25, 2016. technical field [0002] The invention belongs to the technical field of braking devices, in particular to a pneumatic drum-type floating cam balanced self-gap wheel brake. Background technique [0003] The structure of the traditional pneumatic drum brake is as follows figure 1 As shown, it includes brake air chamber a, push rod b, rocker arm c, cam e, brake bottom plate f, brake shoe h (generally, friction lining g is fixed on brake shoe h, and brake Hoof h and friction lining g are defined as one-piece, collectively referred to as brake shoe), upper return spring i, lower return spring j, shaft head k, [0004] The action of the push rod b is controlled by the brake air chamber a, the push ...

AI Technical Summary

Problems solved by technology

When the brake is working, due to structural reasons, the friction force between the leading shoe and the brake drum is increasing, while the friction force between the trailing shoe and the brake drum is decreasing, so that the braking torque of the two brake shoes Different, the wear amount of the two brake shoes will be different after a period of work, so that the gap between the two brake shoes and the brake drum is also different. When the cam drives the two brake shoes to expand outward, at the same rotation angle The gap between the brake shoe and the brake drum is also different, so that when the brake shoe with a small gap is in contact with the brake drum, the cam is pressed against and cannot continue to rotate, and the other brake shoe with a large gap Unable to contact the brake drum, the friction area is reduced, and the braking resistance is greatly weakened

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