Automatic Compensation Mechanism for Drum Brake Backlash

Abstract

The invention provides an automatic compensation mechanism for a brake clearance of a drum brake. The automatic compensation mechanism comprises an adjusting threaded rod and a support rod, wherein one end of the adjusting threaded rod is provided with an external screw thread and is screwed with an adjusting ratchet wheel to extend into an inner chamber of the seaport rod, an adjusting gasket is arranged between the adjusting ratchet wheel and the support rod, the inner chamber of the seaport rod is internally provided with an adjusting spring, one end of the adjusting spring is contacted with the bottom of the inner chamber, the other end of the adjusting spring is contacted with the end face of the adjusting threaded rod, one end of an adjusting shrapnel is fixedly connected with the bottom of the support rod, the other end of the adjusting shrapnel is provided with a ratchet wheel top piece, the ratchet wheel top piece is contacted with the adjusting ratchet wheel, an rotation angle of the adjusting ratchet wheel can be shifted, the whole adjusting gasket is L-shaped, one end of the adjusting gasket is hollowly sleeved on the adjusting threaded rod, and the other end of the adjusting gasket is contacted with the adjusting shrapnel to keep a pretightening force. According to the automatic compensation mechanism, the inner chamber of the support rod is selected to be provided with a small compression spring to drive the mechanism to run and realize the self-adjusting due to the force analysis of the mechanism on the basis of a conventional self-adjusting mechanism, so that the automatic compensation mechanism has the advantages of being more compact in structure, light in weight, and easier to machine and install.

Description

technical field [0001] The invention belongs to the technical field of drum brakes for automobiles, and in particular relates to an automatic compensation mechanism for braking gaps of drum brakes. Background technique [0002] At present, the hydraulic brakes used on vehicles generally include floating brake calipers and leading shoe drum brakes. The gap compensation mechanism of the brake calipers is realized through the deformation and retraction of the piston seal ring. In all drum brakes In the self-adjusting mechanism of the type brake, there are usually one or more springs that fix and drive the self-adjusting mechanism to operate. When moving, the self-adjusting mechanism will produce relative position changes with the opening movement of the brake shoe. At this time, the self-adjusting spring will drive the dial to move in the direction of gap replenishment, so as to achieve the purpose of self-adjustment. The spring of the external buckle is usually made into a st...

AI Technical Summary

Problems solved by technology

The spring of the external buckle is usually made into a strange shape that bends and folds due to the problem of space layout, and the processing cost is high. Moreover, because the force direction of the spring is usually inconsistent with the driving force direction of the self-adjusting mechanism, the utilization rate of the spring force is low. Low, the spring design needs to be increased, the spring mass is much larger than in this structure, and the material cost is also high

In addition, the external spring is usually a tension spring, which needs a hook to be attached to the hole, so the matching parts such as the brake shoe spoke plate, the self-adjusting mechanism support rod, etc. must be drilled. Not only the process is many, but also the processing is often difficult due to the limited space. , so it is necessary to improve

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