| 摘要 |
PURPOSE:To prevent seizure of a clutch friction material due to excessive stroke time and also shift shock due to insufficient stroke time by supplying the oil pressure chamber of an actuator with oil pressure, which is regulated by a pressure regulator valve dependent upon the revolving speed of a rotary member. CONSTITUTION:When the oil pressure chamber 26 of a hydraulic actuator 12 is draioned, a check valve 25 moves apart from a seat 25a with centrifugal force applied to a ball 25a so as to exhaust oil from the oil pressure chamber 26. When oil pressure is supplied to this hydraulic actuator 12, a control part E outputs a comparatively low oil pressure from a pressure regulator valve 27 when the revolving speed of a rotary member 9 from a sensor N is low, as the centrifugal force applied to the ball 25a is then small, and emits a relatively high oil pressure when the revolving speed is high, and depending thereupon a line pressure is supplied to the oil pressure chamber 26 from a primary regulator valve 29 to have engagement of specified clutch C1. This will prevent seizure of a clutch friction material due to excessive stroke time and also generation of shift shock due to insufficient stroke time. |
