关键词: 机械式驻车制动；操作手柄；手刹；锁止失效；卡爪

Abstract: This article briefly describes the working principle of the mechanical parking brake system in automobiles. By analyzing the causes of faults in the operation handle at zero kilometers and at the user end, and proposing solutions, the aim is to reduce the occurrence of such faults. Meanwhile, a detailed analysis of the failure mode of the operation handle lock failure is conducted, and it is concluded that the main cause is the damage of the tooth plate and the claw. Through arguments at three levels: design prevention, manufacturing improvement, and assembly guarantee, specific improvement plans are proposed for material selection, size design and control, and surface heat treatment of the parts. The research methods and improvement measures in this article have practical reference significance for the prevention of similar failure modes in similar products.

Key words: mechanical parking brake; operating handle; handbrake; lock failure; pawl