| 摘要 |
PURPOSE:To enable steering without being affected by a road surface condition by introducing pressure oil into a hydraulic reaction chamber from the upper course side of the control valve of a pressure oil feeding passage leading to a power cylinder via a fixed throttle, installing a reaction pressure control valve midway in the fed oil return passage from said hydraulic reaction chamber. CONSTITUTION:A valve spool 14 which is connected to a pinion shaft 28 which is interlocked with a handling operation, via a swinging lever 30, is incorporated in a control valve 10. Hydraulic reaction chambers 32A, 32B are formed on the both end parts of a spool inserting hole in a valve housing 12, and the both chambers 32A, 32B are connected to each other via a connecting passage 38. This connecting passage 38 is connected to an annular groove 24 which is formed being faced to a pump port 16 having a fixed orifice 40. The connecting passage 38 is branched off at the center part, an oil return passage 42 to a tank T is extended from this branched part, and a pressure control valve 50 is interposed in this oil return passage 42. This valve 50 has a variable throttle part 56 which is slidably displaced by means of a proportional solenoid 52, to carry out a control in accordance with a car speed and a steering angle. |
