| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving-force transmission system in which a motor-operated pump is downsized, and supply of working fluid to a forward friction element part is surely stopped. SOLUTION: A 1st check valve 24 is provided on the outlet side of an oil pump 20 whose operation is stopped in idle-stop time. The working fluid delivered from the motor-operated pump 21 actuated in idle-stop time is shut off by the 1st check-valve 24, and the working fluid does not flow into the oil-pump 20 and a hydraulic circuit 50. Thus, it suffices for the motor-operated pump 21, if it is capable of delivering the working fluid in a quantity required for maintaining the engagement of a forward clutch 31. Consequently, the motor-operated pump 21 can be downsized. The working fluid delivered from the pump 21 is supplied to the forward clutch 31 through a manual valve 32 and a hydraulic control 10. When engagement with the forward clutch 31 is not needed, supply of working fluid to the forward clutch 31 is surely stopped. COPYRIGHT: (C)2005,JPO&NCIPI |
