Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2011-07-26
2011-07-26
Silbermann, Joanne (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S417000
Reexamination Certificate
active
07984785
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.
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International Search Report and Written Opinion mailed Jun. 12, 2009.
Cadman John Michael
French Nathan Harold
Gehlhoff Wade Leo
Ireton Robin Francis
Eaton Corporation
Merchant & Gould P.C.
Silbermann Joanne
Yeagley Daniel
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