Kupplung

摘要

A coupling comprises a sleeve (9) and a hub (11) rotatably disposed therein, first and second driving members (14, 15) in recesses (19, 20) of the hub and spring biased outwardly thereof to engage respective first and second supporting recesses (25, 26) in the sleeve (9), the first driving members (14) being adapted to transmit torque in one rotational direction and the second driving members (15) being adapted to transmit torque in the opposite rotational direction, the circumferential disposition of the first and second driving members and of the first and second supporting recesses being such that when the direction of torque transmission is reversed a certain amount of free rotational movement takes place between the hub and sleeve before torque transmission commences in the opposite direction. The free rotational movement may be used to facilitate the operation of coupling a drive shaft of an agricultural implement to the power takeoff shaft of a tractor. <IMAGE>