Electrohydraulic torque transfer device

Details Electrohydraulic torque transfer device Electrohydraulic torque transfer device

2008-05-13

2011-12-27

Bonck, Rodney (Department: 3655)

192 clutches and power-stop control

Clutch and brake

Vehicle type

C192S085480, C192S085630, C192S08200T

Reexamination Certificate

active

08083041

ABSTRACT:
A power transmission device includes an actuator having an electric motor driving a pump to supply pressurized fluid to a piston acting on a friction clutch to transfer torque between rotatable input and output members. In one instance, a valve between the pump outlet and the piston selectively traps pressurized fluid acting on the piston without continued energization of the electric motor. A gerotor may be formed from a material having a first coefficient of thermal expansion and a housing formed from a material having a second lower coefficient of thermal expansion to vary pump component clearances as the viscosity of the pumped fluid changes with changes in temperature. A method of controlling the power transmission device includes defining a correlation between pump speed, fluid temperature and fluid pressure, determining fluid temperature, determining pump speed, and rotating the pump to transfer a predetermined quantity of torque.

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