| 摘要 |
A selective all wheel drive powertrain has an engine and transaxle adapted to normally drive the front wheels of a vehicle. A transfer gear set, drive shaft, clutch and differential are connectable between the output of transaxle and the rear wheels of the vehicle to selectively provide an all wheel drive system. A pump, which supplies the fluid pressure to engage the clutch, has a pair of relatively rotatable members that are connected to rotate in unison with opposite sides of the clutch such that when the valve is operated, the clutch will be engaged. A selectively operable valve is disposed between a reservoir and the pump and controlled in actuation by the vehicle traction control system (TCS) to connect the pump to the reservoir when a loss of traction is sensed by the TCS. The clutch is effectively controlled by the selectively operable valve that supplies the fluid to the pump. The clutch is disposed in the drive path between the drive shaft and the differential with one set of clutch plates being connected to rotate with the drive shaft and another set of clutch plates being connected to rotate with the input to the differential. The pump has one member rotatable with the drive shaft side of the clutch and another member rotatable with the differential side of the clutch.
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