| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic transmission for a hybrid vehicle, capable of miniaturizing an electric oil pump, while stably supplying a hydraulic pressure by use of the electric oil pump during EV mode driving.SOLUTION: An automatic transmission includes: a regulator valve 51 for adjusting line pressure; first oil passages a3-a5, d1-d2, f1 for supplying line pressure to a hydraulic servo 61 for engaging/disengaging a clutch C-1; second oil passages c1-c5 for supplying the hydraulic pressure discharged from the regulator valve 51 to a lubrication circuit 46 via an oil cooler 45; and third oil passages b2-b3, c4-c5 that connect to the second oil passages to supply the hydraulic pressure generated in an electric oil pump 32 to the lubrication circuit 46. A first check ball valve 43 is provided for preventing the hydraulic pressure from flowing back from a junction X to the oil cooler 45, to prevent a large amount of oil from flowing into the oil cooler 45 when the hydraulic oil is supplied from the electric oil pump 32 to the lubrication circuit 46. |
