Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – One path includes restriction
Patent
1991-11-12
1992-11-24
Denion, Thomas E.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
One path includes restriction
91 51, 91444, 91454, 91459, F15B 1304
Patent
active
051653206
ABSTRACT:
Disclosed is an arrangement that includes a piston cylinder unit having pressure chamber in which fluid acts in opposition to a spring piston combination, a pressure generator and a fluid conduit extending between a tank and the tank. A first and a second valve are connected in series between the pressure generator and tank with the pressure chamber being in fluid communication with the connection between the valves. In known arrangements of the above type there is dead play wherein not every control signal corresponds to a defined position of the piston in the cylinder. However as disclosed herein the setting accuracy is improved by a throttle in parallel with valve that is fluidly connected between the pressure chamber and the piston cylinder unit. Also third and fourth valves may be connected in series between the pressure generator and tank and have a fluid connection between the third and fourth valves to the unit pressure chamber that is opposite the first chamber to provide a bridging circuit.
REFERENCES:
patent: 3045650 (1962-07-01), Ambrosini
patent: 3430540 (1969-03-01), Linz
patent: 3763744 (1973-10-01), Fournell et al.
patent: 4066103 (1978-01-01), Tondrup
patent: 4106390 (1978-08-01), Kodairo et al.
patent: 4211256 (1980-07-01), Sturtz
patent: 4416187 (1983-11-01), Mystrom
patent: 4773300 (1988-09-01), Klatt et al.
patent: 4870892 (1989-10-01), Thomsen et al.
Danfoss A/S
Denion Thomas E.
Easton Wayne B.
Lopez F. Daniel
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