| 摘要 |
<p>1,206,060. Power steering mechanism. HELICOIL CORP. CONTROLS DIVISION. 4 Oct., 1968 [12 Oct., 1967], No. 47684/68. Heading B7H. [Also in Divisions F2 and G3] A servo-valve for the power steering mechanism of a vehicle comprises a spool valve 14, and a ceramic bimorf 42. The pressure on the spool 14 is controlled on the one side by the spring 28 and on the other by the size of the orifice 26. An electrical input impressed on the piezo-electric bimorf 42 causes a displacement of part 44 and hence a displacement of the spool 14. The fluid input 36 is then connected to either of the output ports 38 or 40. The displacement of the spool 14 can be increased by the addition of a bellows-type hydraulic transformer (66), Fig. 2 (not shown), in which case the spool may respond via a rod (55) or a change in orifice size as in the embodiment of Fig. 1.</p> |
