Oil passage control device for automatic transmission

摘要

PROBLEM TO BE SOLVED: To provide an oil passage control device of an automatic transmission capable of controlling oil supply to a torque converter without increasing a physical constitution of the automatic transmission.SOLUTION: In an automatic transmission 1, an oil passage control device 13 includes a torque converter 10, a torque converter return flow oil passage Ftc for supplying an oil from an oil supply device 30 to the torque converter 10, and a lock-up clutch oil passage Flu for supplying the oil from the oil supply device 30 to a lock-up clutch 12, and further includes an oil passage opening/closing member disposed between a first member and a second member configuring a part of the torque converter return flow oil passage Ftc, the oil passage opening/closing member is formed in a state of surrounding an outer periphery of an input shaft 20, and formed into the bag shape which is expanded when a fluid is charged therein, so that it closes between the first member and the second member by being filled with the oil of the lock-up clutch oil passage Flu in engagement of the lock-up clutch 12.SELECTED DRAWING: Figure 1