| 摘要 |
PROBLEM TO BE SOLVED: To obtain an adequate oil discharge amount with a mechanical oil pump while suppressing drag due to the pump drive of the mechanical oil pump to reduce energy loss, during motor travel.SOLUTION: The mechanical oil pump 36 to be rotationally driven by the rotation of an input shaft 18 is connected thereto, not via an engaging device of a forward/reverse movement switching device 16 (a forward movement clutch C1 and a reverse movement brake B1). During motor travel, the forward movement clutch C1 and the reverse movement brake B1 are both released and the mechanical oil pump 36 is rotationally driven from the side of a continuously variable transmission 20, and a variable speed ratio γ of the continuously variable transmission 20 is changed to change the oil discharge amount of the mechanical oil pump 36. Thus, the existing mechanical oil pump 36 is used to generate desired hydraulic pressure depending on a traveling condition during motor travel, e.g., so that the oil discharge amount of the mechanical oil pump 36 can be changed, if necessary, to cool motors M1, M2 and lubricate parts of a power transmission device 10. |
