| 摘要 |
A vehicle driving system in which a clutch is disposed between an engine output member and an automatic transmission and the clutch is used as a start clutch that is slip-controlled when a vehicle starts. When a lubricant relay valve is switched to the communicating position, oil from the pressure-regulating oil passage is supplied to the clutch via the input port, the output port, and the clutch lubricant passage. When the lubricant relay valve is switched to the cutoff position, the oil from the pressure-regulating oil passage is supplied to the clutch via the orifice and the clutch lubricant passage, the feedback pressure of the feedback port is increased, the communication rate between the pressure-regulating port and the back-pressure port is increased, and the amount of lubricant supplied from the back-pressure oil passage to the lubrication portion of the automatic transmission is increased. |
