Patent ID: 11885398
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B  Y | IPC F

Claim 0:
1. 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.