Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1985-12-12
1987-12-08
Croyle, Carlton R.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
417219, 60447, F04B 106
Patent
active
047116161
ABSTRACT:
A control apparatus for a variable displacement pump includes a variable displacement pump having an inlet port and a discharge port driven by an external engine. A piston assembly is provided for varying the amount of displacement of the pump. The control apparatus further includes a switching valve for switching operational fluid which is to be applied to and operates the piston assembly, an additional pump a control pressure a magnitude of which is proportional to the rotational speed of the external engine, a balance piston for transducing the control pressure from the additional pump into a force and for applying the force to one end of the switching valve. A discharge line is provided connecting the discharge port of the variable displacement pump with an external load, and a pilot line is branched off from the discharge line into the switching valve for applying a pressure in the discharge line to the other end of the switching valve.
REFERENCES:
patent: 2630681 (1953-03-01), Ferris
patent: 3708250 (1973-01-01), Thumm
patent: 3935706 (1976-02-01), Stevens
patent: 3985472 (1976-10-01), Virtue et al.
patent: 4032260 (1977-06-01), Bosch
patent: 4080979 (1978-03-01), Hein
patent: 4132506 (1979-01-01), Dantlgraber
patent: 4245962 (1981-01-01), Uehara et al.
patent: 4292805 (1981-10-01), Acheson
patent: 4398869 (1983-08-01), Kirkham et al.
patent: 4480438 (1984-11-01), Breeden
patent: 4509902 (1985-04-01), Knodel et al.
Abe Taizou
Tsukahara Kenji
Croyle Carlton R.
Neils Paul F.
Nippondenso Co. Ltd.
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