| 摘要 |
A type of drum brake for automobiles that is comprised of a brake drum, one or more brake shoes, and one or more brake cylinders. Its special characteristics are: the drum brake further comprises an ordinary gear train which comprises an annulus, one or more planetary gears and a sun gear. Here, the annulus is attached to the brake drum. The sun gear and a mounting shell of the brake shoes are attached to each other. The planetary gears are located between the annulus and the sun gear, and one or more planetary gear axles of the respective planetary gears are affixed with one or more planetary carriers. By adopting the drum brake of this invention and the ordinary gear train, when the brake is applied, the brake shoes rotate in the opposite direction relative to the moving direction of the brake drum, thereby greatly reduce the braking distance and braking time.
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