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Drum brake brake clearance automatic regulation device

An automatic adjustment device, drum brake technology, applied in the direction of the slack adjuster, etc., can solve the problems of brake pad and brake drum wear, brake pad stroke increase, contact area reduction, etc., to achieve high reliability, Elimination of brake clearance and short drive chain

Pending Publication Date: 2018-08-17
高自强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong friction between the brake pad and the brake drum during the braking process of the drum brake, the wear of the brake pad and the brake drum will reduce the contact area between the brake pad and the brake drum. Problems such as small size, increased stroke to push the brake pads to expand outward, and reduced braking force

Method used

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  • Drum brake brake clearance automatic regulation device
  • Drum brake brake clearance automatic regulation device
  • Drum brake brake clearance automatic regulation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: as figure 1 , 2 , 6 and 7, when the car brakes, the brake cylinder pushes the brake arm 2 to rotate, and drives the brake camshaft 4 to rotate, and the cam at the right end of the brake camshaft spreads the brake shoe to make the brake The disc is in contact with the brake drum to achieve the purpose of braking.

[0018] The dial in the gap automatic adjustment device is set on the brake camshaft, and the dial and the brake camshaft are connected by splines. When the brake camshaft rotates under the push of the brake cylinder, it drives the dial to rotate, and the ratchet There are symmetrical arc-shaped long grooves on the upper end surface of the disc, and two pin shafts are fixed on the contact surface between the dial and the ratchet disc, and the two pin shafts are inserted in the arc-shaped long grooves.

[0019] Under normal conditions, the moving arc length of the pin shaft in the arc-shaped long slot is the same as the arc length of the arc-shap...

Embodiment 2

[0022] Embodiment 2: On the basis of Embodiment 1, the drum brake adopts 2 brake camshafts, so that the technical scheme that 2 brake cylinders can be used to drive 2 brake camshafts to rotate can also be adopted image 3 , 4 , The technical scheme shown in 5.

[0023] The above-mentioned technical solution is to use a planar link mechanism to transmit the push of one dynamic cylinder to two brake camshafts. The specific solution is that a swing rod 12 is fixedly installed on the two brake camshafts. Between them are hinged by connecting rod 13, when the upper braking camshaft rotates, it drives the fork to rotate, and drives the fork on the lower braking camshaft and the lower braking camshaft to rotate through the connecting rod.

[0024] The gap automatic adjustment device 5 described in embodiment 1 is installed on the upper and lower brake camshafts, and its working process is the same as in embodiment 1.

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PUM

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Abstract

The invention relates to drum brakes, in particular to a drum brake brake clearance automatic regulation device which comprises a brake cylinder, a brake drum, brake feet of four feet and eight blocksinstalled in the brake drum and a cam shaft used for pushing the brake feet of four feet and eight blocks to stretch; and the cam shaft is connected with the brake cylinder and a brake arm. The drumbrake brake clearance automatic regulation device is characterized in that a clearance automatic regulation device is installed on the cam shaft in a sleeving manner, is fixed on a drum brake chassisand is formed in a ratchet wheel mechanism. The technical scheme of the invention has the characteristics of simple structure, short transmission chain, high reliability of structure and the like andcan effectively ensure the brake stability and the brake reliability of the drum brake.

Description

Technical field [0001] The invention relates to a drum brake, in particular to an automatic adjustment device for a brake gap of a drum brake. Background technique [0002] Drum brakes are widely used in some economical cars and heavy vehicles due to their relatively simple structure, low cost, and large braking force. Because the drum brake utilizes the frictional force produced by the inner cylindrical surface of the brake drum when the brake pad expands outward to decelerate the wheel to achieve the purpose of braking. At present, there are mainly two forms of outward expansion of the brake pads: the wheel-cylinder type that pushes the brake pads to expand outward through hydraulic cylinders or cylinders, and the cam type that pushes the brake pads to expand outward through cam rotation. Due to the strong friction between the brake pad and the brake drum during the braking process of the drum brake, the wear of the brake pad and the brake drum will reduce the contact are...

Claims

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Application Information

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IPC IPC(8): F16D65/42
CPCF16D65/42
Inventor 高自强刘文华高杰高克高骞
Owner 高自强
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