| 摘要 |
PURPOSE:To enhance the parking characteristic of a four wheel drive vehicle, by providing a four wheel drive transfer for automatically change-over the drive of the vehicle between its two wheel drive condition and its four wheel drive condition so that the four wheel drive condition is established when an engine is stopped. CONSTITUTION:There are provided a transfer manual valve 410 for supplying line pressure oil fed from an oil passage 6 into oil passages 7, 8 under the control of a shift lever positioned at a driver's seat and a relay valve 420. Further, there are provided an inhibitor valve 440 for changing over the coupling of C3 and B4, a third accumulator control valve 460, a shift timing valve 470, an accumulator 4 for making the engagement of a clutch C3 smooth, and hydraulic servo-mechanisms B-4, C-3, C-4 for clutches C3, C4. With this arrangement, even if the setting position of a bar 410 is positioned at any one of positions H2, H4, L4, the line pressure is discharged into the servo-mechanism C-4 for the clutch C4 when the engine is cut off, so that the four-drive condition may be established. |
