| 摘要 |
PURPOSE:In a flow controller where fluid is delivered from a pump through an orifice to a power steering system, to maintain the flow characteristic constant by preparing two orifices and constructing one of them with shape memory alloy which will enlarge opening under low temperature. CONSTITUTION:A spool valve 22 is inserted slidably into a containing hole 11 made through the pump housing 10 and contacted through a spring 26 against a control spool 23 inserted into a hole in an union 21. The control spool 23 is energized by a spring 27 placed between an orifice forming member 24 fitted over the outer end section of union inner hole to contact against the step 21b at the inner end. In such a flow controller, the orifice forming member 24 is formed with first orifice 24a in the center while a plurality of second orifices 24b in the circumference. A doughnut-shaped control member 35 made of shape memory alloy is secured to the orifice 24b to control such that the opening will be enlarged under low temperature. |
