| 摘要 |
PURPOSE:To make a hydraulic controller lighter and smaller by a method wherein valves shift control valves are employed so that the operation of three shift valves are operated with two solenoid valves. CONSTITUTION:As spools 59 and 60 of two solenoid valves 37, 38 move to the right, first - third distribution control oil paths 51-49 communicates with an oil drain path 48 to obtain the first speed shift. When the solenoid valve 37 is driven, a first hydraulic feed path 52 communicates with the first distribution control oil path to obtain the second speed shift. When both the solenoid valves 37 and 38 are driven, the first hydraulic feed path 52 cmmunicates with the first and second distribution control oil paths to obtain the third speed shift. When the solenoid valve 38 alone is driven, the first hydraulic feed path 52 communicates with all of the first - third distribution control paths 51-49 to obtain the fourth speed shift. |
