Power transmission apparatus for a vehicle

A power transmission apparatus for a vehicle, comprising:

• a first input shaft for selectively receiving an input torque through a first clutch;
• a second input shaft formed as a hollow shaft, coaxially and exteriorly disposed with the first input shaft without rotational interference, and selectively receiving the input torque through a second clutch;
• first and second intermediate shafts disposed along a same axis that is in parallel with the first input shaft, the first and second intermediate shafts being selectively interconnected through a third clutch;
• a torque mediating shaft formed as a hollow shaft and coaxially and exteriorly disposed with the first input shaft;
• a preliminary shifting section receiving a torque through the first input shaft and selectively outputting a shifted torque to the first intermediate shaft;
• a compound shifting section including a planetary gear set of which a sun gear is fixedly connected with the torque mediating shaft, a planet carrier is fixedly connected with the second input shaft, and a ring gear is externally gear-meshed with the second intermediate shaft;
• and
• an output shaft disposed in parallel with the first input shaft, receiving a torque received from the compound shifting section, and transmitting the received torque to a differential,
• wherein the preliminary shifting section comprises:
• a first drive gear fixedly connected with the torque mediating shaft;
• a first driven gear fixedly connected with the first intermediate shaft and externally gear-meshed with the first drive gear;
• a second drive gear rotatably disposed on the first input shaft;
• and
• a second driven gear fixedly connected with the first intermediate shaft and externally gear-meshed with the second drive gear.