Actuating mechanism with an automatic adjustment for brakes, especially for juggernauts

摘要

An actuator for brakes with automatic adjustment suitable in particular for heavy duty vehicles comprises a housing (32) whose axis (A) is surrounded by a cam surface (36). A rotary member (40) is rotatable about the housing axis (A) and comprises a second cam surface (42) with which it bears on the first cam surface (36) to produce an axial displacement dependent on its rotation. A first screw member (50) is likewise rotatable about the housing axis and a second screw member (60) is formed to exert an actuating force on a brake pad. The second screw member is connected to the first screw member by a pair of threaded adjustment members (62). A reset shaft (92) is mounted in the housing (32) and permits a screwing back of the two screw members (50, 60) with respect to each other to replace the brake pad. The reset shaft (92) is disposed with lateral spacing from the housing axis (A) and is connected to one of the screw members (50) via a gearing ( 88, 90).