| 摘要 |
PURPOSE:To reduce influence of voltage fluctuation by constructing an actuator for operating one movable member of control valve with a hydraulic piston, a spool valve and a solenoid valve. CONSTITUTION:Upon turning off of a solenoid valve 55 through a speed change ratio controller, the sleeve 22 of a control valve 20 is moved to the left while following a hydraulic piston 40. Consequently, the hydraulic pressure in cylinder chambers 7, 10 will increase to move the left supporter 6 downward while the right supporter 6 upward. As a result, the direction of force to be applied to a power roller 4 will change to transfer the troidal speed change section 1 to the speed increase side. In this way the troidal speed change section 1 is controlled to the desired speed change ratio which is sustained. |
