Patent ID: 8215440

Claim:
A drive train of a vehicle, comprising a primary drive train and a secondary drive train, further comprising: a primary axle which is permanently driven via the primary drive train; and a secondary axle as part of the secondary drive train; wherein the secondary axle is connectable to the primary axle via a switch-on mechanism of a switch-on device in order to allow the integration of the secondary drive train into the drive train so that the overall drive train power is transferred over both the primary axle and the secondary axle, and wherein when the secondary axle is connected to the primary axle, the secondary drive train power is conveyed via at least one side shaft couplings into side shafts of the secondary axle and is transmitted to wheels of the secondary axle the secondary drive train having a shutdown section located between the switch-on device and the at least one side shaft coupling, whereby: the switch-on mechanism and/or the side shaft couplings comprise at least one frictionally engaged coupling and when the secondary axle is disconnected from the primary axle in order to transfer the overall drive train power via the primary axle only, the shutdown section of the secondary drive train is decoupled from both the primary axle of the primary drive train and the wheels of the secondary axle.