Power transmission device for vehicle
AssigneeHitachi Construction Machinery Co., Ltd.
InventorsHiroki Ueno, Takuma Koinuma
Life of this patent
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Abstract
A transmission (21) as a power transmission device for a vehicle comprises an input shaft (22), an output shaft (23), and a planetary continuously variable transmission mechanism (31). The planetary continuously variable transmission mechanism (31) comprises a planetary gear mechanism (32), a pump side clutch (33), a hydraulic pump (36), a hydraulic motor (38), and a motor side clutch (40). The hydraulic pump (36) and the hydraulic motor (38) are connected via a pair of main lines (37A, 37B). When the transmission (21) is switched from a traveling state to a neutral state, at least one clutch (33, 40) of the pump side clutch (33) and the motor side clutch (40) is released.
Claims8
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.
Dependencies are inferred from the claim text.