Patent ID: 8523734

Claim:
A multi-mode hybrid transmission for a vehicle, comprising: an input shaft to receive torque from a prime mover; a countershaft operatively connected to a final drive shaft, wherein the input shaft and the countershaft are in parallel alignment; first and second gear pairs having different gear ratios, each one of the first and second gear pairs defining a torque path and including an input gear carried by the input shaft and an output gear carried by the countershaft, wherein the output gears are supported on a sub-shaft that is rotatable relative to the countershaft; a first synchromesh clutch assembly coupled to the input shaft to selectively engage the input gear of one of the first and second gear pairs, wherein only one of the first and second of gear pairs transfers torque from the input shaft to the countershaft when engaged by the first synchromesh clutch assembly; and an electric machine including a rotor carried by the input shaft, wherein the electric machine is operable to provide supplemental torque to the countershaft during periods of reduced torque from the prime mover associated with a change in the torque path.