Power transmission device for vehicle

A power transmission device for a vehicle, comprising:

• an input shaft rotated by a prime mover mounted on the vehicle;
• an output shaft outputting rotation to a traveling device of the vehicle;
• a planetary continuously variable transmission mechanism disposed between the input shaft and the output shaft, and changing speed of a rotation on an input shaft side and transmitting power to an output shaft side;
• a direct connecting mechanism transmitting the rotation on the input shaft side to the output shaft side by bypassing the planetary continuously variable transmission mechanism;
• and
• an idler element mechanically connecting an output side of the planetary continuously variable transmission mechanism and an output side of the direct connecting mechanism, wherein
• the direct connecting mechanism is provided with a first clutch disposed between the input shaft and the idler element, and
• the planetary continuously variable transmission mechanism comprises:
• a planetary gear mechanism connected to the input shaft side;
• a second clutch disposed on an output side of the planetary gear mechanism;
• a hydraulic pump connected to the output side of the planetary gear mechanism via the second clutch;
• a hydraulic motor connected to the hydraulic pump via a pair of main lines;
• a third clutch disposed between the hydraulic motor and the idler element or the output shaft;
• and
• a communication valve capable of switching between a communicating state and a blocking state between the pair of main lines.