Patent ID: 6389917
Filing Date: 2002-05-21
Classification: B60N,F16D,Y10T

Abstract:
In a safety device for a gear unit (15) driven by a drive mechanism (21), havinga drive element (24) and a power takeoff element (14), a torque-transmitting gear member (25) between the drive element (24) and the power takeoff element (14), a rated breaking point (33) embodied as a cross-sectional weakening between the hub (28) and the circumference of the wheel disk (32) of the gear member (25), and a silent ratchet (47), with which upon a separation of the rated breaking point (33) the severed gear part (27) can be clamped firmly at least indirectly on a housing (18) of the gear unit (15), the improvement wherein, on the drive side of the rated breaking point (33), at least one axially upward-protruding, radially deflectable rib (39) is formed onto the wheel disk (32); on the power takeoff side of the rated breaking point (23), at least one eccentric cam member (45) is formed onto the wheel disk (32) or the hub (28); the cam member (45) located on the same side of the wheel disk (32) next to the rib (39) is offset circumferentially from the rib (39) and has a maximum radial length that is greater than the radial spacing of the rib (39) from the axis (36) of the gear member (25); the rib (39) and the cam member (45) are embraced with slight radial play by the wall (41) of a circular-cylindrical recess (40) of a housing (18) that is nonrotatable relative to the gear member (25); and the gear unit (15) is embodied as self-locking on the drive side.