Patent ID: 6041903
Filing Date: 2000-03-28
Classification: F16D

Abstract:
A hydraulic coupling for use in a motor vehicle driveline apparatus to rotatively couple first and second rotary members, the hydraulic coupling comprising:a cover assembly fixed for rotation with the first rotary member and surrounding the second rotary member to define a drum chamber;a transfer clutch located in said drum chamber and including a clutch pack having a first clutch plate fixed for rotation with said cover assembly and a second clutch plate fixed for rotation with the second rotary member;a piston housing located in said drum chamber and defining a piston chamber, a first transfer port in fluid communication with said piston chamber, and a second transfer port in fluid communication with said clutch pack;a piston disposed in said piston chamber for movement relative to said clutch pack for exerting a clutch engagement force thereon the magnitude of which is a function of the fluid pressure in said piston chamber; anda hydraulic pump located in said drum chamber and operative for delivering fluid to said first and second transfer ports in response to a speed differential between the first and second rotary members.