Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1990-07-02
1991-04-16
Smith, Leonard E.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
417222, 417270, 91505, F04B 4900, F04B 130, F01B 1304
Patent
active
050078054
ABSTRACT:
Reversible, variable displacement, hydraulic devices are useful in transmitting power from an engine to a driven device. The hydraulic components of such devices are generally quite bulky and difficulty to center to swash plate thereof. The subject device includes a pair of servo valves adjustably disposed within a case for individually controlling the flow of actuating fluid to and from a pair of hydraulic servo actuators. A servo feedback mechanism is provided to mechanically move a valve spool of one of the servo valves to a position for exhausting fluid from one of the servo actuators as the spool of the other servo valve is moved to a position for directing actuating fluid to the other of the servo actuators. The feedback mechanism also moves the spools substantially to their neutral position when a swash plate controlled by the servo actuators reaches a desired angular position after the other spool is first moved to the position for directing actuating fluid to the other servo actuator. The feedback mechanism is compact and cooperates with the adjustability of the servo valves so that centering of the swash plate is simplified.
REFERENCES:
patent: 3643550 (1972-02-01), Lease
patent: 4028010 (1977-06-01), Hopkins
patent: 4205590 (1980-06-01), Stegner
patent: 4248137 (1981-02-01), Caruso
patent: 4379389 (1983-04-01), Liesener
patent: 4381646 (1983-05-01), Ruseff et al.
patent: 4466337 (1984-08-01), Eiler
patent: 4478136 (1984-10-01), Heiser et al.
Pages 20-23 of a Technical Description, dated 1983 and published by Linde Hydraulic.
Goade James C.
Werner Claude H.
Caterpillar Inc.
Grant John W.
Savio, III John A.
Smith Leonard E.
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