Patent ID: 6881169

Claim:
A power transmission system for a vehicle, comprising: a power source generating a driving force of the vehicle the power source comprising an internal combustion engine and a motor/generator; and a transmission comprising: a transmission input shaft, an input gear set attached to the transmission input shaft, a transmission output shaft, an output gear set attached to the transmission output shaft, a plurality of coupling sleeves one of which selectively fixes one gear of the input gear set and the output gear set to one of the transmission input shaft and the transmission output shaft so as to establish a desired transmission ratio between the transmission input shaft and the transmission output shaft, an automatic clutch that is selectively put in one of an engaged state for connecting the transmission input shaft with an output shaft of the power source and a disengaged state for disconnecting the transmission input shaft from the output shaft of the power source to execute a shift operation of the transmission, and a bypass driveline that transmits a power of the power source to the transmission output shaft while bypassing the automatic clutch when the automatic clutch is put in the disengaged state.