Fluid system having dual output controls

Details Fluid system having dual output controls Fluid system having dual output controls

1992-06-03

1993-06-29

Bertsch, Richard A.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60452, 60468, F04B 126

Patent

active

052228703

ABSTRACT:
The flow changing response of fluid systems having variable displacements pumps are greatly effected by the inertia of the displacement changing mechanisms, such as, the swashplate and at least half of the fluid pumping piston assemblies. In the present invention, a fluid system is provided which has a first flow changing mechanism operable to maintain a relatively constant pressure differential across a variable orifice device in a valve mechanism to change the flow of the fluid being delivered from the fluid pump to the fluid system. Simultaneously therewith, a second flow changing mechanism having a fast acting bypass mechanism acts in parallel with the first flow changing mechanism to more quickly bypass fluid being delivered from the fluid pump to the fluid system thus eliminating pressure spikes in the fluid system. The second flow changing mechanism is operable to establish a second larger differential pressure across the variable orifice device. Therefore the first flow changing mechanism normally has priority over the second flow changing mechanism.

REFERENCES:
patent: 3820920 (1974-06-01), Klimaszewski et al.
patent: 4107924 (1978-08-01), Dezelan
patent: 4379389 (1983-04-01), Liesener
patent: 4383412 (1983-05-01), Presley
patent: 4518322 (1985-05-01), Nonnenmacher
patent: 4523430 (1985-06-01), Masuda
patent: 4892465 (1990-01-01), Born et al.
patent: 5094597 (1992-03-01), Takai et al.
patent: 5129230 (1992-07-01), Izumi et al.

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