| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power steering device capable of efficiently performing filling of an operation oil. <P>SOLUTION: The power steering device is provided with a reversible pump provided with a pair of delivery port for feeding an oil pressure to both pressure chambers of a hydraulic power cylinder through first and second passages; a first one-way valve provided in the first passage and only allowing a flow of the operation oil from a reservoir tank side to the first passage side; a second one-way valve provided on the second passage and only allowing the flow of the operation oil from the reservoir tank side to the second passage side; a third one-way valve provided in the first passage and only allowing the flow of the operation oil from the first passage side to the reservoir tank side; a fourth one-way valve provided on the second passage and only allowing the flow of the operation oil from the second passage side to the reservoir tank side; a pump control means for rotating/driving the reversible pump in a direction for feeding the operation oil to the pressure chamber at the side where the reversible pump is stopped or the volume is reduced when filling work of the operation oil is performed. <P>COPYRIGHT: (C)2007,JPO&INPIT |
