Patent ID: 11859703
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  E  B | IPC E  F

Claim 0:
1. A power transmission device for a vehicle, comprising:
an input shaft rotated by a prime mover mounted on a vehicle;
an output shaft outputting rotation to a traveling device of the vehicle; and
a planetary continuously variable transmission mechanism disposed between the input shaft and the output shaft and changing speed of a rotation on the input shaft side and transmitting power to the output shaft side, wherein
the planetary continuously variable transmission mechanism comprises:
a planetary gear mechanism connected to the input shaft side;
a first 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 first clutch;
a hydraulic motor connected to the hydraulic pump via a pair of main lines;
a second clutch disposed between the hydraulic motor and the output side of the planetary gear mechanism; and
a controller controlling connection and release of the first clutch and the second clutch, wherein
when the controller is switched from a traveling state capable of transmitting the power from the prime mover to the traveling device to a neutral state of cutting off or restricting transmission of the power from the prime mover to the traveling device, the controller releases at least one clutch of the first clutch and the second clutch.