Patent ID: 7338403

Claim:
A power transmission device comprising: a rotary input member adapted to receive drive torque from a source of drive torque; a rotary output member adapted to transmit drive torque to an output device; a main clutch operably disposed between said input and output members; a ballramp unit having a first cam member engageable with said main clutch, a second cam member, and rollers disposed between said first and second cam members; a pilot clutch operably disposed between said input member and said second cam member; a clutch operator assembly including a mode fork having a first segment engageable with said pilot clutch and a second segment engaging a cam surface on a rotary cam; an electric motor for driving said rotary cam such that rotation of said rotary cam in a first direction causes pivotal movement of said mode fork into engagement with said pilot clutch while rotation of said rotary cam in a second direction causes pivotal movement of said mode fork to disengage said pilot clutch; and a control system for adaptively controlling actuation of said electric motor.