Patent ID: 8602151

Claim:
A drive system for a motor vehicle comprising: a continuously driven primary axle and a selectably driven secondary axle, having a differential that acts between wheels of the secondary axle and having a torque transmission device for transmitting a drive torque to the differential, wherein the torque transmission device has a clutch and a pump, wherein the pump produces a hydraulic pressure in a first pressure chamber of the clutch when a speed difference arises between the primary axle and the secondary axle, the hydraulic pressure actuating the clutch, wherein the first pressure chamber is connected by a connecting line to a second pressure chamber that is associated with an actuating member of the differential, so that the hydraulic pressure produced by the pump also permits an at least partial locking of the differential, wherein the first pressure chamber is connected to a low-pressure chamber via a first discharge line, wherein a first control valve is arranged in a section of the first discharge line that is implemented separately from the connecting line, and wherein the second pressure chamber is connected to the low-pressure chamber via a second discharge line, wherein a second control valve is arranged in a section of the second discharge line that is implemented separately from the connecting line, wherein a passive pressure reduction member is located in the connecting line between the first pressure chamber and the second pressure chamber, in the first discharge line, or in the second discharge line.