Dual-hydraulic drum type braking device

Abstract

The invention discloses a dual-hydraulic drum type braking device which comprises a brake disc sleeved with a hub. A left brake shoe and a right brake shoe are symmetrically arranged in the brake disk. The top end of the left brake shoe and the top end of the right brake shoe are connected through an upper telescopic hydraulic cylinder. The bottom end of the left brake shoe and the bottom end of the right brake shoe are connected through a lower telescopic hydraulic cylinder symmetrical to the upper telescopic hydraulic cylinder. The upper end of the left brake shoe and the upper end of the right brake shoe are connected with the two ends of an upper extension spring respectively. The lower end of the left brake shoe and the lower end of the right brake shoe are connected with the two ends of a lower extension spring respectively. By arranging the upper telescopic hydraulic cylinder and the lower telescopic hydraulic cylinder which are symmetrical to each other at the top ends and the bottom ends of the left brake shoe and the right brake shoe, during braking, the upper ends and the lower ends of the left brake shoe and the right brake shoe are moved outwards at the same time, the contact area of the brake shoes and the hub is large, the concentration of friction force in the braking process is reduced, the problem that the brake shoes dissipate heat in an excessive concentrated mode when the friction force is excessively concentrated is solved, and durability of the brake shoes is improved.

Description

technical field [0001] The invention relates to the technical field of vehicle brakes, in particular to a dual hydraulic drum brake device. Background technique [0002] The braking system of the vehicle now basically uses disc brakes and hydraulic drum brakes. The hydraulic drum brake system uses a two-way acting two-stage telescopic cylinder to control the brakes. The two-way acting two-stage telescopic cylinder is installed on the brake shoe. The upper end of the brake shoe is used to realize the braking function by controlling the movement of the hydraulic rod of the double-acting two-stage telescopic cylinder. At this time, the effective area of ​​the brake shoe for braking is quite limited, and only the upper end of the brake shoe is used. The lower part is equivalent to not being used, and the lower part is only partially used after the upper part of the brake shoe is worn. For example, the Chinese invention patent with the publication number CN101799051A, which make...

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Problems solved by technology

For example, the Chinese invention patent with the publication number CN101799051A, which makes the friction force during the braking process all concentrate on the upper part of the brake shoe. If the friction force is too concentrated, it may cause the brake shoe to be too concentrated and heat during the sudden braking process. Affects the braking effect of brake shoes

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