Patent ID: 6286643
Filing Date: 2001-09-11
Classification: F16D

Abstract:
A parking brake mechanism in a drum brake, the drum brake being a duo-servo type drum brake including: a link type shoe drive mechanism in which a shoe operating force applied to an input lever is transmitted to a primary shoe and a secondary shoe, which are arranged in a drum with being opposed to each other, so that the brake shoes are pressed against the drum and a pushing force of each of the primary shoe and the secondary shoe to the drum is controlled according to an anchor reaction force acting on an anchor pin; and an operating force generator for service brake for applying a shoe operating force to the input lever via a swinging lever swung according to a braking operation,said parking brake mechanism comprising:a parking lever pivotally supported by one of the primary shoe and the secondary shoe, said parking lever including a link drive section provided at an end thereof for transmitting the shoe operating force to the input lever at the time of swinging said parking lever,wherein each of the primary shoe and the secondary shoe is pressed against the drum via the shoe drive mechanism when the parking lever is swung.