Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1980-09-04
1983-03-29
Look, Edward K.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
60449, 417218, 417244, F04B 4900
Patent
active
043782000
ABSTRACT:
A hydraulic system comprising a full flow supercharged variable displacement pump and a fixed displacement charge pump adapted to be driven by the same prime mover as the variable displacement pump for supplying fluid to the variable displacement pump. An orifice is provided in the supply line to the variable displacement pump, a circuit is provided from a point downstream of the orifice to tank pressure, and a feedback valve is provided in series with the circuit. The feedback valve comprises a pair of mutually and oppositely adjustable flow restrictions in series with said circuit. The restrictions are connected to the displacement varying means to vary them equally and oppositely in proportion to the movements of the displacement varying means. A speed sensing control valve is responsive to the pressure level between the two restrictions and the pressure level upstream of the orifice and is connected to the outlet of the variable displacement pump and operable to operate the displacement varying means to reduce the displacement of the pump when the pressure differential between the pressure at the outlet of the feedback means and the pressure upstream of the orifice falls below a predetermined value.
REFERENCES:
patent: 3412683 (1968-11-01), Anderson
patent: 3543508 (1970-12-01), Schwab
patent: 3625637 (1971-12-01), Kiwalle et al.
patent: 3742820 (1973-07-01), Lonnemo
Edwards Thomas L.
Lambeck Raymond P.
Look Edward K.
Vickers Incorporated
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