Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1982-02-03
1984-06-19
Hershkovitz, Abraham
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60452, F16D 3102
Patent
active
044547161
ABSTRACT:
A hdydrostatic load sense vehicle steering system which directs fluid from a source to a hydrostatic steering circuit that includes a steering controller, and to an auxiliary circuit. Fluid control means responds to fluid pressures in a pilot circuit to direct priority flow to the steering circuit and excess flow to the auxiliary circuit. The pilot circuit includes a first pilot conduit that communicates with a load sense port of the steering controller. The steering controller controls fluid pressures in the pilot circuit in accordance with the condition of the steering circuit. A second pilot conduit communicates a pressure signal in accordance with the condition of the auxiliary circuit to the fluid control means. The second pilot conduit also communicates through a bleed orifice with the load sense port of the steering controller. When the controller is in neutral, it directs the pilot fluid from its load sense port to a reservoir. When the controller moves away from neutral, it restricts pilot flow to the reservoir to provide a pressure signal in the pilot circuit that indicates a need for flow and pressure in the steering circuit.
REFERENCES:
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patent: 3979908 (1976-09-01), Alderson
patent: 3996742 (1976-12-01), Goff
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patent: 4336687 (1982-06-01), Morgan
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Hydrostatic Load Sense System Shown by Drawing #OM-570-8-563 of Control Concepts, Inc., Newton, Pa.
"Flow Controls Keep Hillside Combine Level", by Yohn, Coleman, Enzmann. From 11/75, Hydraulics and Pneumatics, Magazine.
U.S. Patent Application 06/243,497, Drawings.
Hershkovitz Abraham
Moritz Scott L.
TRW Inc.
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