Patent ID: 7337886

Claim:
A power transfer device for use in a motor vehicle having a powertrain and first and second drivelines, comprising: a differential having an input driven by the powertrain, a first rotary output coupled to the first driveline and a second rotary output coupled to the second driveline; a friction clutch operably disposed between any two of said input and said first and second rotary outputs; a clutch actuator for applying a clutch engagement force to said friction clutch, said clutch actuator including an operator mechanism having a first actuator plate rotatable about an axis and having a set of first grooves and an arm segment with a cam surface formed thereon, a second actuator plate having a set of second grooves, and balls disposed in aligned pairs of said first and second grooves, and a piston assembly including a follower engaging said cam surface such that movement of said piston assembly between first and second positions causes corresponding relative angular movement between said first and second actuator plates so as to cause corresponding axial movement of said second actuator plate relative to said friction clutch; and a power-operated drive mechanism for controlling movement of said piston assembly.