| 摘要 |
PURPOSE:To improve the responsiveness of speed change by producing oil pressures in first and second lines by means of first and second pressure regulating valves and feeding a working fluid to one of primary side and secondary side hydraulic actuators by the pressure difference between the oil pressures while discharging the working fluid from the other. CONSTITUTION:A working fluid from an oil pressure source 74 is set into an oil pressure in a first line oil passage 80 and an oil pressure in a second line oil passage 82 lower than that in the first line oil passage 80 by means of a first pressure regulating valve 100 and a second pressure regulating valve 102 respectively. And, the working fluid is fed into one of primary side and secondary side hydraulic actuators 70, 72 for varying the effective diameter of a movable pulley while being discharged from the other, with its flow rate being controlled by a flow control valve 264 in accordance with the operation of a speed change directional selector valve 262, being driven by means of the pressure difference in oil pressure between the first and second lines. Thereby, a large thrust ratio varying range of both actuators can be obtained, to eliminate the lowering of responsiveness and drivability while reducing the power loss of a hydraulic pump.
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