Drive system for an all-wheel driven motor vehicle having a first and a
second driven axle (3, 9), which drive system has a
differential-speed-dependent clutch (6) for driving the second driven
axle, and an at least partially lockable differential (8) between the
wheels of the second driven axle (9). The differential-speed-dependent
clutch (6) comprises a pump (10) which, when a differential speed occurs,
produces a pressure which leads to the transmission of a torque to the
second driven axle (9). In order to ensure that the differential lock
responds in a manner coordinated neatly in terms of time and taking
account of the driving state, a connecting line (18) leads from the
delivery side (11 or 12) of the pump (10) to an actuating member (27) of
the lockable differential (8), with the result that, when a differential
speed occurs, the pressure produced by the pump (10; 67) makes it possible
to at least partially lock the differential (8) by means of a positive
locking clutch (26).
