Patent ID: 7207922

Claim:
A power train for a motor vehicle, said power train comprising: a drive unit; a gearbox with a first gearbox input shaft and a second gearbox input shaft; and a clutch device with a first multi-disk clutch arrangement, which is assigned to the first gearbox input shaft, and a second multi-disk clutch arrangement, which is assigned to the second gearbox input shaft, for transmitting torque between the drive unit and the gearbox; a pump arrangement for supplying operating fluid to the clutch arrangements for operation under the action of the operating fluid, wherein the pump arrangement or a flow-adjusting device includes at least one hydraulic valve that can be controlled by a control unit to adjust the instantaneous flow of operating fluid through a coolant circuit to the disk clutch arrangements independent of an operating state of the disk clutch arrangements, and a temperature sensing device configured to detect the temperature of the operating fluid in the coolant circuit, the control unit is designed to increase or to decrease the flow of operating fluid in the coolant circuit by operating the at least one hydraulic valve as a function of the instantaneous demand for the supply of operating medium to at least one of the clutch arrangements and in response to the temperature sensing device in such a way that the control unit decreases or interrupts the flow of operating fluid in the coolant circuit when the supply demand is low and increases the flow of operating fluid in the coolant circuit when the supply demand is high.