Patent ID: 8388486

Claim:
A vehicle drive train for transferring torque to first and second sets of wheels, the drive train comprising: a first driveline being adapted to transfer torque to the first set of wheels and including a first power disconnection device; a second driveline being adapted to transfer torque to the second set of wheels and including a differential gearset having a pair of pinion gears in meshed engagement with a pair of side gears, one of the side gears being coupled to a second power disconnection device; a hypoid gearset positioned within the second driveline in a power path between the first and second power disconnection devices, wherein the hypoid gearset is selectively disconnected from being driven by either of the first driveline and the second driveline when the first and second power disconnection devices are operated in a disconnected, non-torque transferring mode, wherein the second power disconnection device includes an active multi-plate clutch having a first set of clutch plates fixed for rotation with the differential gearset output, the clutch further including a second set of clutch plates fixed for rotation with an output shaft adapted to transfer torque to one of the wheels of the second set of wheels; and a valve operable to limit a flow of coolant to the multi-plate clutch when the second power disconnection device operates in the disconnected mode.