Motors: expansible chamber type – Differential – Motive fluid constantly applied to one working member face
Patent
1979-04-05
1981-03-17
McCarthy, Edward J.
Motors: expansible chamber type
Differential
Motive fluid constantly applied to one working member face
13759617, F15B 1517
Patent
active
042560179
ABSTRACT:
A doser type hydraulic actuator includes a pair of unequal area pistons on a common shaft which are moved incrementally by injecting into or removing from a control pressure chamber metered quantities or doses of fluid. Doses are metered by timed openings of solenoid valves connecting the control pressure chamber to supply or return pressure sources. Special valve means are provided for moving the actuator piston to a preferred position in the event of control system failure, and means are included for administering very small doses consistently without recourse to special extra fast response solenoid valves.
REFERENCES:
patent: 2625136 (1953-01-01), Moog
patent: 2650609 (1953-09-01), Herbst
patent: 2999482 (1961-09-01), Bower
patent: 3279323 (1966-10-01), Asche
patent: 3382769 (1968-05-01), Raider
patent: 3618469 (1971-11-01), Wills
patent: 3763744 (1973-10-01), Fournell
patent: 4007361 (1977-02-01), Martin
United Technologies Corporation Publication NAS CR 135135 PWA-5471, Dec. 1976, by D. M. Newirth and E. W. Koenig, "Analysis and Design of Digital Output Interface Devices for Gas Turbine Electronic Controls."
Air Equipment Report entitled "Design and Development of a Digital Input Flight Servocontrol," 10/2/77.
McCarthy Edward J.
McCormick Jr. Leo H.
Smith Robert C.
The Bendix Corporation
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