Power transmission system of vehicle

The car of the power transmission apparatus is disclosed. Power transmission system of a vehicle according to an embodiment of the present invention includes a first input shaft is a solid shaft made selectively connected to the main power source of the engine; Consists of a hollow shaft is arranged without rotational interference superimposed on the first input shaft a second input shaft that is selectively connected to the power source and the primary engine; First and second planetary comprised of gear set, and has four rotary shaft by mutual combination, selectively connected to the two rotating shafts, each of the four rotation axis of the first and second axis of rotation for holding each of the three rotary elements the transmission portion that works as an optional input element; The axis of rotation of the four transmission portion, the first and the secondary power source is either of the two rotational axis that is not connected to the second rotary shaft directly connected to a rotating shaft motor / generator; The axis of rotation of the four transmission portion, the first and second rotation axis and the output shaft which is directly connected to the remaining one rotation shaft is not connected to the motor / generator; And it is disposed on a portion for selectively connecting the output shaft of the engine and the first and second input shafts, and includes four control element disposed in the portion for selectively coupling the rotating shaft and the transmission housing.