Motors: expansible chamber type – Working member position responsive motive fluid control – Working member controls relatively movable inlet valve
Patent
1984-09-20
1986-12-09
Garrett, Robert E.
Motors: expansible chamber type
Working member position responsive motive fluid control
Working member controls relatively movable inlet valve
F15B 13042
Patent
active
046273280
ABSTRACT:
A hydraulic controlling and actuating system has a hydraulic source having a high-pressure side and a low-pressure side and a hydraulic actuator connected to a controlled element and having one compartment pressurizable for moving the element into one of its end positions and another compartment pressurizable for moving the element into the other of its end positions. A control valve for this arrangement has source-side ports connected to the high- and low-pressure sides, respective valve-side ports connected to the actuator compartments, and a valve body displaceable from a center position interconnecting and permitting flow freely between all of the ports into two opposite end positions in one of which the high-pressure source-side port is connected to the one actuator compartment and the low-pressure source-side port is connected to the other actuator compartment and in the other of which the low-pressure port is connected to the one actuator compartment and the source-side port is connected to the other actuator compartment. The valve is so constructed and arranged that on displacement between either end valve position and the center valve position the flow through the valve between the source and the actuator is smoothly and regularly varied from maximum flow in the end valve positions to no flow in the center valve position. A link connected between the actuator and the valve displaces the valve body as the element nears a one of its end positions on displacement therebetween from the respective end valve position to the center valve position.
REFERENCES:
patent: 917917 (1909-04-01), White
patent: 1001821 (1911-08-01), Coffield
patent: 2109162 (1938-02-01), Boehle
patent: 3374713 (1968-03-01), Broughton
patent: 4207803 (1980-06-01), Gottling
"Systematik der Hydraulischen Widerstandsschaltungen", Chapter 5.
Article by Lang et al, "Hydraulische Lenkung . . . ", ATZ Automobiltechnische Zeitschrift (6/1974).
F and D Findeisen, Olhydraulik (Springer-Verlag, 6/1978), pp. 136-138.
Durr et al., Hydraulische Antriebe (Carl Hanser Verlag, 6/1958), pp. 148, 149.
Dubno Herbert
Garrett Robert E.
Maschinenfabrik Walter Scheele GmbH & Co. KG
Ross Karl F.
Williamson Mark A.
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