Power transmission apparatus for vehicle

A power transmission apparatus for a vehicle, comprising:

• a first input shaft fixedly connected to an output side of an engine;
• a second input shaft formed of a hollow shaft, disposed on an outer circumference of the first input shaft without rotation interference to overlap the first input shaft, and selectively connected to the first input shaft through a first clutch;
• a third input shaft formed of a hollow shaft, disposed on an outer circumference of the second input shaft without rotation interference to overlap the second input shaft, and selectively connected to the first input shaft through a second clutch;
• a transmitting shaft disposed on the peripheral circumference of the first input shaft without rotation interference to correspond to a front side of the second input shaft;
• a central shaft disposed in parallel with the first input shaft in a state in which the central shaft is spaced apart from the first input shaft by a predetermined interval;
• a fixed transmission selectively shifting an input torque depending on the respective gear ratios of three change gear trains disposed between the second and third input shafts, the transmitting shaft, and the central shaft and each having drive gears and driven gears externally connected to each other and outputting the shifted torque through the central shaft and the transmitting shaft;
• a composite transmission including one planetary gear set having a sun gear fixedly connected to one side of the transmitting shaft, a planetary carrier selectively connected to the first input shaft connected through a third clutch, and a ring gear selectively connected to the central shaft to shift input torques and output the shifted torque;
• and
• an output shaft disposed in parallel with the first input shaft in a state in which the output shaft is spaced apart from the first input shaft by a predetermined interval and outputting the torque transferred from the composite transmission to a final reduction gear.