Patent ID: 6383109
Filing Date: 2002-05-07
Classification: B60K,F16H

Abstract:
A drive unit for driving a second driven axle of an all-wheel drive vehicle with a hydraulic coupling, comprising a driven case and two half shafts, which can each be connected to the driven case by a friction clutch, the friction clutch being operatively connected to a hydraulic positive displacement machine that operates when a rotational-speed difference occurs between the case and the half shaft, the positive displacement machine has a first and a second rotor which can rotate in a case, whereina) the half shafts are connected to one another by a three-member averaging transmission comprising a first and a second member each drivingly connected to one half shaft and a third member which rotates at a rotational speed which is the average of the rotational speeds of the first and the second member, b) the first rotor of the hydraulic positive displacement machine is drivingly connected to the third member of the averaging transmission and which is operatively connected to both friction clutches.