A torque transfer mechanism having a multi-plate friction clutch connecting a pair of rotary members and an electrohydraulic clutch actuator for controlling engagement of the friction clutch. The clutch actuator includes a hydraulic pump, a hydraulically-actuated rotary operator, and a ball ramp mechanism....http://www.google.es/patents/US7278943?utm_source=gb-gplus-sharePatente US7278943 - Power transmission device with electrohydraulic clutch actuator
Power transmission device with electrohydraulic clutch actuator
