Control means for variable displacement pump

Details Control means for variable displacement pump Control means for variable displacement pump

1982-11-08

1983-08-16

Look, Edward K.

Pumps

Condition responsive control of drive transmission or pump...

Plural pumps with individual or relative control

60447, 60449, 417218, F04B 4900

Patent

active

043988695

ABSTRACT:
A control means for a variable displacement pump (12) driven by an engine (10) and having a servo-cylinder (78) determining the displacement of the variable pump (12). A charge pump (14) is driven by the engine (10) and supplies charge pressure to the variable pump (12) through an orifice (40). Pilot conduits (42,44) on each side of the orifice (40) sense the pressure drop due to flow and relay the resulting signals to each end of a metering spool (52) in a speed control valve (46), which is arranged to control the pressure in the servo-cylinder (78). A spring (90) biases the servo-cylinder (78) toward an extreme position for the variable pump (12) and opposes the pressure directed to the servo-cylinder (78) by the speed valve (46) in order to provide a smooth transition between the extreme positions for pump displacement.

REFERENCES:
patent: 3543508 (1970-12-01), Schwab
patent: 3625637 (1971-12-01), Kiwalle et al.
patent: 3789943 (1974-02-01), Kampert et al.
patent: 3902320 (1975-09-01), Marietta
patent: 3963378 (1976-06-01), McMillan
patent: 4115033 (1978-09-01), Kleineisel et al.
patent: 4203712 (1970-05-01), Uehara

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