Patent ID: 8721493

Claim:
A drive train system, comprising: a power transfer unit configured to selectively transfer power from a front driveshaft of a vehicle by providing an output torque through a ring gear, wherein the power transfer unit includes an input shaft, a sleeve, and a first clutch, the sleeve concentric with the input shaft, the ring gear fixedly coupled to the sleeve, the first clutch including an engaging gear coupled to the input shaft, wherein the input shaft receives torque from a first device and the first clutch is configured to selectively couple the input shaft to the ring gear when activated via direct gear-to-gear engagement between the ring gear and the engaging gear of the first clutch; a cardan shaft configured to be driven by the ring gear and configured to transfer the output torque; and a rear drive unit coupled to the cardan shaft and configured to selectively transfer the output torque received from the cardan shaft to a rear driveshaft of the vehicle, wherein the rear drive unit includes a torque shaft that is driven by the output torque received from the cardan shaft, and a second clutch that is configured to selectively transfer the output torque from the torque shaft to the rear driveshaft when activated.