Patent ID: 6315097
Filing Date: 2001-11-13
Classification: F16D

Abstract:
A hydraulic coupling for use in a driveline apparatus for a motor vehicle having a casing containing hydraulic fluid to rotatively couple first and second rotary members, the hydraulic coupling comprising:a cover assembly at least partially defining a sealed cavity;a transfer clutch operatively connectable between the first and second rotary members;a piston housing defining a piston chamber;a piston disposed in said piston chamber and actuable to engage said transfer clutch and rotatively couple the first and second rotary members;a hydraulic pump for providing a pumping action in response to relative rotation between the first and second rotary members;a fluid flow path for supplying hydraulic fluid from a supply chamber to said hydraulic pump, from said hydraulic pump to said piston chamber, and returning said hydraulic fluid from said piston chamber to said supply chamber, said fluid path generally extending within said sealed cavity;an electrically powered mover disposed in said sealed cavity and located in said flow path, said electrically powered mover regulating flow of hydraulic fluid through said fluid flow path to control the pressure in said piston chamber for actuating said piston; anda flow control module monitoring operating conditions of said motor vehicle and controlling said electrically powered mover in response to said operating conditions.