| 摘要 |
<p>1469621 Power steering systems EATON CORP 21 Feb 1975 [28 March 1974] 7373/75 Heading B7H [Also in Division F2] In a valve assembly dividing flow from an inlet 34 between a priority flow outlet 30 connected to a power steering system, and an excess flow outlet 38 connected to auxiliary mechanism, a flow control spool 90, which is positioned according to the fluid pressures in the outlets acting on respective ends 50, 74, is provided with two series of apertures 24, 26, through both of which flow takes place to outlet 30 when the steering system is in use, and through only apertures 24 flow takes place when the auxiliary mechanism is in use. The apertures 24 are smaller than apertures 26 and with the spool maintain a constant predetermined minimum flow to the steering system when the spool has moved to the right by differential fluid outlet pressures so that the apertures 26 are covered by surface 82 of the spool bore. When the spool is positioned so that flow takes place through both series of apertures 24, 26, land 42 on the spool acts to throttle the flow to the outlet 38 and the spool moves under differential fluid outlet pressures to maintain the flow to outlet 30 at a constant predetermined maximum flow. In a modification the apertures 24 are positioned in the spool to the left of land 42.</p> |
