Powertrain for a motor vehicle

A powertrain for an all-wheel drive motor vehicle having a drive unit generating drive torque and a primary axle having a primary axle differential receiving drive torque from the drive unit and a pair of primary axleshaft drivingly connecting the primary axle differential to a pair of primary wheels, the powertrain comprising:

• a torque diversion device arranged at the primary axle and having an input shaft driven by a primary differential cage associated with the primary axle differential, an output pinion shaft, and a first clutch operable in a first mode to disconnect said output pinion from driven connection with said input shaft and operable in a second mode to releaseably connect said output pinion to said input shaft for transferring a portion of the drive torque generated by the drive unit to said output pinion;
• a torque transfer device drivingly connected to said output pinion;
• and
• a secondary axle adapted to drive a pair of secondary wheels and including an input pinion shaft drivingly connected to said torque transfer device, a ring gear driven by said input pinion shaft, a secondary axle differential, a pair of secondary axleshafts connecting said secondary axle differential to said secondary wheels, a second clutch operably disposed between said ring gear and said secondary axle differential, and a third clutch operably disposed between said secondary axle differential and one of said secondary axleshafts.

A powertrain for an all-wheel drive motor vehicle having a drive unit generating drive torque, the powertrain comprising:

• a primary axle including a primary differential and a pair of primary axleshafts, said primary differential having a primary differential cage and a pair of primary differential output gears driven by said primary differential cage, said primary axleshafts interconnecting said primary differential output gears to a pair of primary wheels;
• a torque diversion device arranged at said primary axle and having an input shaft driven by said primary differential cage, an output pinion shaft, and a first clutch operable in a released mode to inhibit the transfer of drive torque between said input shaft and said output pinion shaft and operable in an engaged mode to permit the transfer of drive torque from said input shaft to said output pinion shaft;
• a torque transfer device driven by said output pinion shaft;
• and
• a secondary axle having an input pinion shaft driven by said torque transfer device, a ring gear driven by said input pinion shaft, a secondary differential, a pair of secondary axleshafts drivingly connected to a pair of secondary wheels, a second clutch, and a third clutch, said secondary differential having a secondary differential cage driving a pair of secondary differential output gears which are drivingly coupled to said secondary axleshafts, said second clutch being operably disposed between said ring gear and said secondary differential cage to control the transfer of drive torque therebetween, and said third clutch being operably disposed between said secondary differential cage and one of said secondary axleshafts to control torque transfer therebetween.