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US 7,610,935 B2Granted
Fluid controller
AssigneeSauer-Danfoss ApS
InventorNiels Arbjerg
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AssigneeSauer-Danfoss ApS
InventorNiels Arbjerg
Estimating the term…
The invention provides a fluid controller, e.g. for a hydrostatic power steering. The controller comprises a cylindrical valve member cooperating with a housing to define at least one fluid path from a pressure source to a steering cylinder. The valve member is rotatable in the housing and comprises a sleeve and a spool, wherein the spool is rotatable within the sleeve. The fluid flow is metered by a flow meter, and the valve member comprises a plurality of meter ports communicating the fluid between the valve member and the flow meter. To obtain less friction between the sleeve and the housing and between the sleeve and the spool, the meter ports are grouped in two groups in which groups the ports are in mutually fluid communication.
A fluid controller operable to control a flow of a fluid from a source of pressurized fluid to a pressure operated device, the controller comprising:
A valve member for a fluid controller, the valve member comprising an inlet opening, a tank opening, a first control opening, a second control opening, and a plurality of meter ports, the valve member being provided for a neutral configuration and for first and second operating configurations in which operating configurations the valve member defines a path between the inlet opening and a first group of meter port and from a second group of meter port to one of the control openings and from the other control opening to the tank openings, wherein the meter ports of the first group of meter ports are in fluid communication and the meter ports of the second group of meter ports are in fluid communication.
Dependencies are inferred from the claim text.