Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1980-07-15
1982-07-06
Spiegel, H. Jay
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60421, 60422, 60426, 60430, 91516, 91517, 91518, 91532, 137101, 137114, F15B 102, G05D 1103
Patent
active
043376207
ABSTRACT:
A system is disclosed for controlling the flow of fluid from a pair of pumps (15,15') to a steering system (11) and a pair of auxiliary load circuits (13,13'). The steering system includes valving (43) defining a variable flow control orifice (45), and the steering system normally operates with a pressure differential X across the variable orifice, and provides load pressure signals (47,49,49',53,53') representative of demand for fluid by the steering system. Fluid flow from the pumps is controlled by a pair of priority flow control valves (21,21') including a pair of valve members (27,27') each of which is biased by a spring (29,29') toward a position permitting flow to the steering system. The spring (29) exerts a biasing force equivalent to the pressure differential X while the spring (29') exerts a biasing force equivalent to a pressure differential Y, which is less than X. When the output of the pump (15) is unable to maintain the pressure differential X across the flow control orifice, the differential across the orifice drops to Y, at which point the valve member (27') is biased by the spring (29') to permit flow from the pump (15') to the steering system.
REFERENCES:
patent: 3279558 (1966-10-01), Allen et al.
patent: 3455210 (1969-07-01), Allen
patent: 3463261 (1969-08-01), Runkle et al.
patent: 3952511 (1976-04-01), Turner
patent: 4002220 (1977-01-01), Wible
patent: 4015681 (1977-04-01), Shore et al.
patent: 4044786 (1977-08-01), Yip
patent: 4192337 (1980-03-01), Alderson et al.
Eaton Corporation
Grace C. H.
Kasper L. J.
Spiegel H. Jay
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