Power transmission apparatus for vehicle

A power transmission apparatus for a vehicle, comprising:

• a first input shaft fixedly connected with a power source;
• a second input shaft in a form of hollow shaft coaxially disposed with the first input shaft, and configured to surround the first input shaft, the second input shaft configured to be selectively connected with the first input shaft via a first clutch;
• a third input shaft in a form of a hollow shaft coaxially disposed with the second input shaft and configured to surround the second input shaft, the third input shaft configured to be selectively connected with the first input shaft via a second clutch;
• a first output shaft disposed in parallel with the first input shaft;
• a second output shaft arranged in series to and on a same axis with the first output shaft, and selectively connected with the first output shaft;
• a first shift-stage shifting section configured to receive a torque of the third input shaft and to shift the received torque to two shifted torques, the shifted two torques being outputted to the first output shaft;
• a second shift-stage shifting section configured to receive a torque of the second input shaft and to shift the received torque to one shifted torque and one reverse torque, the one shifted torque and one reverse torque being outputted to the first output shaft;
• a compound shifting section configured to selectively receive an output torque from the first input shaft and the first output shaft and to shift the received output torque to a shifted output torque, the shifted output torque being outputted to a final reduction device through the second output shaft.