| 摘要 |
PURPOSE:To enable the hydraulic characteristic of a power cylinder to be suit ably changed in accordance with an external signal, by controlling a pressure difference between right and left pressure oil chambers in the power cylinder connected to a hydraulic bridge circuit. CONSTITUTION:The first variable throttles 1R, 1L, 2R, 2L, constituted of vari able orifices, are inserted interposingly in flow paths L1, L2 and L3, L4 in a bridge circuit. Inserting variable throttles 3R, 3L to be interposed in series to the variable throttles 2R, 2L in their downstream side in the flow paths L3, L4, connection points CC1, CC2 between the variable throttles 3R, 3L and 2R, 2L are respectively connected to input sides of an external control unit 16. The variable throttles 1L, 1R, 2L, 2R, 3L, 3R are constituted so as to operate being associated with the steering action of a steering 15 and so as to change in the direction of reducing the throttling area corresponding to steering torque T. The external control unit 16 has a variable throttle so as to control the throttle opening by a signal from a car speed sensor 22. |
