| 摘要 |
PURPOSE:To enable the reverse motion of a vehicle despite the lock-up of a shift valve or the like, by connecting the downstream side of an oil passage to a oil pressure source not through the shift valve when the transmission of the vehicle is in reverse position. CONSTITUTION:The transmission comprises a third-speed forward driving system 4 including a hydraulic clutch 3 provided on an input shaft 1a coupled to an engine through a torque converter 2, a second-speed forward driving system 6 including a hydraulic clutch 5, a first-speed forward driving system 8 including a hydraulic clutch 7 provided on an output shaft 1b, and a backward driving system 9, which is provided in parallel with said system 6 to jointly use the clutch 5. A manual valve 16 is installed in the oil passage, which connects the shift valve 18 to the clutch 5. When the transmission is in reverse position, the manual valve 16 disconnects the shift valve 18 and the clutch 5 from each other and connects the downstream side of the oil passage, which is coupled to the clutch 5, to the oil pressure source 19 not through the shift valve 18. |
