Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1992-12-17
1994-05-24
Look, Edward K.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60426, 60428, 91518, F16D 3102
Patent
active
053137957
ABSTRACT:
The invention is an improvement in a control system having first, second and third sources of fluid at differing pressures. The improvement comprises a tripath pressure selector network connected to the first and second sources. A pressure-sensing device connects the network and the third source when the third source is at a predetermined minimum pressure. The invention has particular utility in mobile construction machinery having, e.g., steering, implement and brake hydraulic circuits, at differing pressures. In one embodiment, the third source is a brake hydraulic circuit. The improvement helps assure that adequate pilot pressure is available for a "downstream" pilot control valve.
REFERENCES:
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patent: 3129781 (1964-04-01), Stein
patent: 3918847 (1975-11-01), Junck et al.
patent: 4065228 (1977-12-01), McMillan
patent: 4473090 (1984-09-01), Uehara et al.
patent: 4517800 (1985-05-01), Karakama et al.
patent: 4633666 (1987-01-01), Karakama
patent: 4648466 (1987-03-01), Baker et al.
patent: 4825659 (1989-05-01), Huydts
Graphic Symbols for Fluid Power Diagrams, p. 12 Oct. 1967.
Case Corporation
Look Edward K.
Ngyyen Hoang
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