This drum brake is enacted as research project in order to promote its actual output brake torque, which not only meets society demands but also improves the brake safety of heavy duty trucks of manufactured produce and service vehicles.

• 本文即以此种制动器为研究对象,以提高其实际输出制动力矩为研究目的,既满足社会的现实需要又提高现生产和现使用的重型载货车的制动安全性。