| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power steering device capable of realizing enhancement of steering stability against kick back from a road surface and enhancement of responsiveness of steering assistance, capable of preventing a hydraulic circuit from becoming the over-load state, capable of reducing driving energy of a reversible pump and capable of preventing the circuit from becoming the over-heat state. <P>SOLUTION: A drain flow passage 9 is provided in such a state that it communicates a pump chamber of the reversible pump P with a reservoir tank RT and an orifice interposed on the drain flow passage 9 is constituted by slide clearances k1, k2 formed by both side surfaces of a driving gear and a driven gear in the reversible pump P and a slide surface of a pump head 1 and a side plate 3. A differential pressure valve 10 for allowing a flow from the pump chamber (hydraulic circuit 28) side to the reservoir tank RT side is interposed in the drain flow passage 9 between the orifice and the reservoir tank RT. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
