发明授权
- 专利标题： Power assist apparatus for steering system
- 专利标题（中）： 转向系统动力辅助装置
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申请号： US800176申请日： 1997-02-13
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公开(公告)号： US6035958A公开(公告)日： 2000-03-14
- 发明人: Norihiro Saita , Tatsuyoshi Maruyama , Toshinori Aihara , Tadaharu Yokota
- 申请人： Norihiro Saita , Tatsuyoshi Maruyama , Toshinori Aihara , Tadaharu Yokota
- 申请人地址： JPX Atsugi
- 专利权人： Unisia Jecs Corporation
- 当前专利权人： Unisia Jecs Corporation
- 当前专利权人地址： JPX Atsugi
- 优先权： JPX8-049571 19960213; JPX8-052658 19960216; JPX8-052659 19960216
- 主分类号： B62D5/06
- IPC分类号： B62D5/06 ; B62D5/083 ; B62D5/08
摘要：
A steering power assist apparatus is comprised of a power cylinder whose operation is controlled by the a flow rate control valve, a first control valve and a second control valve. The flow rate control valve is connected to a discharge side of a hydraulic pump and controls the amount of the hydraulic oil to be supplied to the first and second control valves according to a load pressure. The first control valve constituted by choke valves is disposed downstream of the flow rate control valve and controls the amount of the hydraulic oil supplied to the second control valve according to a steering torque. The second control valve constituted by choke valves is disposed downstream of the flow rate control valve and controls the amount of the hydraulic oil to the power cylinder according to a steering torque. The choke valves of the second control valve are fully closed after the choke valves of the first control valve are fully closed.
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