Hub-pulley assembly having a rotationally disengageable pulley

摘要

A hub-pulley assembly (6; 40; 70; 100; 120) comprising a hub (21) adapted to be connected to a rotational member of a motor vehicle and having an axis (A), a pulley (22) adapted to cooperate with a drive belt (5) and driving means (25; 44; 33, 34; 101; 122) arranged between the hub (21) and the pulley (22). The driving means (25; 44; 33, 34; 101; 122) comprise bidirectional disengagement means (33, 34; 101) which allow a relative rotation between the hub (21) and the pulley (22) in both directions.