| 摘要 |
PURPOSE:To prevent the speed change shock in the selection of speed change stage and easily adjust the charging time for clutch OIL pressure by selecting all the speed stages and direction stages by solenoid valves and engaging all the clutches from drain states by electric signals at speed change. CONSTITUTION:Oil is introduced into a control valve 2 from an oil pump 18 and then introduced into a torque converter 4. The oil whose pressure is adjusted by a main relief valve 24 is introduced into a pilot reducing valve 25 and an accumulator valve 21. Further, a number of solenoid valves 33-36 are controlled by a controller 15 according to the car speed. Each speed stage selecting valve 29, 30 is shifted by opening and closing each solenoid valve 33, 34, and distribution to the first - third speed of the speed clutch hydraulic pressure is carried out, and the speed change between the first - third speed is realized. While, each direction stage selector valve 31, 32 is shifted by opening and closing each solenoid valve 35, 36, and distribution to the F speed or R speed of the direction stage clutch oil pressure is carried out, and advance/ retreat selection is carried out. |
