Hydraulic control for variable displacement pumps

Details Hydraulic control for variable displacement pumps Hydraulic control for variable displacement pumps

1977-02-24

1977-12-27

Geoghegan, Edgar W.

Pumps

Condition responsive control of drive transmission or pump...

417216, 60428, 60449, 60486, F04B 4900

Patent

active

040652289

ABSTRACT:
A hydraulic system for controlling the displacement of a plurality of variable displacement pumps driven by a single prime mover including a source of pilot fluid under pressure including a fixed displacement pump adapted to be driven by the prime mover proportional to the speed thereof, a double-piloted, underspeed valve having an inlet and an outlet, the outlet being adapted to be connected to the variable displacement pumps for controlling displacement thereof, a conduit connecting one of the pilots to the source, an additional conduit, including a flow restricting device, connecting the other of the pilots to the source, and a summing valve having ports adapted to be connected to respective ones of the pumps, a port connected to the second conduit and a port connected to the inlet of the underspeed valve.

REFERENCES:
patent: 3543508 (1970-12-01), Schwab
patent: 3732036 (1973-05-01), Busby et al.
patent: 3841795 (1974-10-01), Ferre et al.
patent: 3963378 (1976-06-01), McMillan
patent: 4008004 (1977-02-01), Shaw

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