| 摘要 |
PURPOSE:To provide always a proper steering reaction by providing an electromagnetic valve having a variable throttle path responsive to engine speed on the way of the return side circuit of a control valve operatively changed over on the basis of the input rotation of a steering wheel to increase or decrease the steering reaction in response to vehicle speed. CONSTITUTION:A control valve 21 pivots a yoke 30 through a pinion shaft 29 by the input rotation of a steering wheel to supply oil discharged from a pump P to a hydraulic cylinder by changing over and displacing a valve sleeve 27 through a drive lever 28. In a return side circuit 57 of the valve 21 is interposed an electromagnetic valve 33 having a valve 35 having a valve spool 37 inserted into a valve hole 36. The valve spool 37 has annular recesses 44-46, and an annular convex portion 49 defining both recesses 45, 46 is provided with a slant surface 50 forming a throttle path 52 between said portion 49 and an annular convex portion of the valve hole 36. Thus the upstream side of the throttle path 52 communicates to reaction oil chambers 32A, 32B through circuits 55, 56. |
