Patent ID: 8308590
Filing Date: 2012-11-13
Classification: F16D,F16F,F16H

Abstract:
1. A pulley-hub assembly comprising a hub adapted to be connected to a rotational member of a motor vehicle and having an axis (A), a pulley adapted to cooperate with a drive belt, at least one relief member radially arranged with respect to said axis (A) and carried by one of said hub and pulley, and a bidirectional disengagement structure which allow a relative rotation between said hub and said pulley in both directions, wherein said bidirectional disengaging structure comprises at least a first abutting area and a second abutting area carried by the other of said hub and pulley and spaced in a circumferential direction to delimit a respective hollow space accommodating with circumferential clearance said at least one relief member, said first abutting area defining a first stop position in which said hub and said pulley are coupled in a first direction of rotation, and said second abutting area defining a second stop position in which said hub and said pulley are coupled in a second direction of rotation opposite said first direction of rotation, said hub-pulley assembly further including a viscous friction material contained inside said hollow space and cooperating between said hub and said pulley.