A torque transfer mechanism having a multi-plate friction clutch connecting a pair of rotary members and a 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/US7004873?utm_source=gb-gplus-sharePatente US7004873 - Transfer case with electrohydraulic clutch actuator
Transfer case with electrohydraulic clutch actuator
