| 摘要 |
PURPOSE:To improve durability of solenoid valves, by supplying the pressure oil to an input pulley hydraulic servo directly from a hydraulic pressure source via a modulator valve not through a speed reduction ratio control valve at steady running time except up and downshift time. CONSTITUTION:A primary regulator valve 30, to which a throttle pressure changed in accordance with the opening of a throttle valve 40 is input, regulates the pressure of oil from a hydraulic pressure source 20, and the primary line pressure is output and introduced to the hydraulic servo of an input pulley 150 by a speed reduction ratio control valve 51 controlled by up and downshift solenoid valves 55, 56. Then the primary line pressure is directly supplied from the hydraulic pressure source 20 to the hydraulic servo of the input pulley 150 through an input pulley modulator valve 67 at steady running time except up and downshift time. Accordingly, the solenoid valves 55, 56 are not turned on and off at steady running or downshift maintaining time, thus durability and reliability of the solenoid valve can be improved. |
