The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 2014
Filed:
Jul. 26, 2011
John Michael Cadman, Eden Prairie, MN (US);
Nathan Harold French, Prior Lake, MN (US);
Wade Leo Gehlhoff, Shakopee, MN (US);
Robin Francis Ireton, Searcy, AR (US);
John Michael Cadman, Eden Prairie, MN (US);
Nathan Harold French, Prior Lake, MN (US);
Wade Leo Gehlhoff, Shakopee, MN (US);
Robin Francis Ireton, Searcy, AR (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
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.