Patent ID: 7249537

Claim:
A double clutch transmission for a hybrid electric vehicle having an engine and a motor, the double clutch transmission comprising: a main input shaft receiving torque from the engine; a first input shaft rotating coaxially with the main input shaft; a second input shaft rotating coaxially with the main input shaft and along an exterior circumference of the first input shaft; first and second clutches for selectively transmitting torque of the main input shaft to either the first or the second input shaft; a drive gear unit including a plurality of drive gears disposed on the first and second input shafts; a first output device including a first output shaft disposed parallel to and apart from the first and second input shafts by a predetermined distance and also including a plurality of driven gears and a first output gear thereon, such that torque of drive gears on the first and second input shafts are selectively changed and output; a second output device including a second output shaft and a reverse idle shaft disposed parallel to and apart from the first and second input shafts by predetermined distances, a plurality of driven gears, a second output gear, a reverse driven gear disposed on the second output shaft, and a plurality of reverse mediating gears disposed on the reverse idle shaft, such that torque of drive gears on the first and second input shafts are selectively changed and output; a differential gear connected to both the first output gear and the second output gear; and a motor input/output unit for selectively transmitting torque of the motor to the second input shaft through a plurality of gears and a drive gear on the second input shaft.