| 摘要 |
PURPOSE:To make it possible to change the steering force of a steering wheel in accordance with physical values such as a vehicle speed and the like, by controlling a pressure control valve in accordance with instructions from a control device so that the maximum pressure of a pressure mechanism side passage may be variably controlled. CONSTITUTION:A hydraulic reaction force control device 40 is composed of a fixed restrictor valve 41 connecting between a passage 101 on the servo-valve 10 side and a passage 201 on the reaction side, an electromagnetic control valve 43 which is connected so that pressure oil from a circuit common to both second output port 315 of a flow divider control valve 30 and reaction mechanism 20 is returned to a reservoir and has an applied electrical current which is substantially proportional to the amount of the return oil, and a pressure control valve 50 which is an electromagnetic hydraulic pressure control valve for changing the set position of a spring retainer member 53 in accordance with a current applied to a solenoid 51 to flex a coil spring 55 in order to continuously change the relief pressure. With this arrangement it is possible to change the maximum pressure of the reaction mechanism side passage.
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