SELF-ENERGIZING PUMP FOR OVERRUNNING CLUTCH

摘要

A pump includes a cam member and an armature plate received on an input s haft rotatably supported with a differential housing of a clutch. The pump a lso includes a cylinder rod slidingly received in a chamber of a master cyli nder to pressurize a hydraulic fluid. The cam member includes a ring and a b ack plate. The ring has an outer, preferably symmetrical, surface with a var iable radius defining a ramped portion for outwardly driving the cylinder ro d when the cam member is rotated either forward or backward with respect to the differential housing. A coil generates an electromagnetic field when act ivated drawing the cam member towards the armature plate such that contact f orces causes the cam member to rotate with the armature plate. A roller disc is rotatably supported at one end of the cylinder rod for rolling contact b etween the cylinder rod and the cam surface of the cam member ring.