| 摘要 |
PURPOSE:To make a manual torque gear producing pressure characteristic at high-speed driving into the ideakustic one, by constituting the pressure oil divided to the side of a reaction chamber by a flow dividing control valve to be controlled with each action of a solenoid relief valve and a variable throttle valve according to a car speed. CONSTITUTION:A flow rate Q0 of pressure oil to be discharged out of a feed pump 60 is controlled to a constant flow rate Q by a flow control valve 61, and this flow is divided to both sides of a servo valve 30 and a reaction chamber 56 by a flow divind control valve 65. In a state of a car speed being low, a maximum current is fed to a solenoid relief valve 70 via a control circuit 81 where a car speed signal V is inputted, setting relief setting pressure to zero, and a variable throttle valve 100 is made to come into a state of being fully opened. And, when the car speed exceeds the specified value, the relief setting pressure of the solenoid relief valve 70 increases according to a rise in the car speed, making reaction oil pressure PR go up. With this, the setting pressure operates the variable throttle valve 100, pressurizing a plunger 54 of a reaction mechanism, it is made to work so as make operation of a steering wheel heavier. |
