发明申请
- 专利标题： Control Valve Assembly for Electro-Hydraulic Steering System
- 专利标题（中）： 电动液压转向系统的控制阀组件
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申请号： US12039599申请日： 2008-02-28
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公开(公告)号： US20090218161A1公开(公告)日： 2009-09-03
- 发明人: John Michael Cadman , Nathan Harold French , Wade Leo Gehlhoff , Robin Francis Ireton
- 申请人： John Michael Cadman , Nathan Harold French , Wade Leo Gehlhoff , Robin Francis Ireton
- 申请人地址： US OH Cleveland
- 专利权人： EATON CORPORATION
- 当前专利权人： EATON CORPORATION
- 当前专利权人地址： US OH Cleveland
- 主分类号： B62D5/09
- IPC分类号： B62D5/09 ; G05D11/02 ; B62D5/065
摘要：
A steering system includes a fluid pump and an electro-hydraulic steering circuit in selective fluid communication with the fluid pump. The electro-hydraulic steering circuit defines a first flow path having a first proportional valve and a first load-sense passage in selective communication with the first proportional valve. The first proportional valve includes a closed position. A hydrostatic steering circuit is in selective fluid communication with the fluid pump and defines a second flow path having a second proportional valve and a second load-sense passage in selective fluid communication with the second proportional valve. The second flow path is in a parallel flow configuration with the first flow path. An isolation valve is disposed in the first flow path in series with the first proportional valve. The isolation valve includes a closed position and is piloted to the closed position by fluid communicated through the second load-sense passage.
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