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Max R North, 98Scottsdale, AZ
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Us Patents
Fixed Displacement Pump With Variable Capacitance Flow Regulator
US Patent:
4388052, Jun 14, 1983
Filed:
Mar 26, 1981
Appl. No.:
6/247667
Inventors:
Eugene L. Falendysz - Racine WI
Eldon M. Brumbaugh - Racine WI
Max R. North - Racine WI
Eldon M. Brumbaugh - Racine WI
Max R. North - Racine WI
Assignee:
J. I. Case Company - Racine WI
International Classification:
F04B 3900
F04B 2300
F16L 5504
F04B 2300
F16L 5504
US Classification:
417540
Abstract:
A fixed displacement pump including a variable capacitance flow regulator for absorbing the excess fluid flow from the pump which is not required by a hydraulic system. The variable capacitance flow regulator, in a hydraulic embodiment, includes a pair of pistons slidably movable within a housing for independent movement relative to each other. The fluid pressure in the hydraulic system is communicated to a first of the pistons to bias it to various positions within the housing depending upon the pressure level in the hydraulic system. The second or varibale capacitance piston is acted upon by the fluid pressure in the pump discharge chamber, and when the pressure in the hydraulic system exceeds the spring pre-load against the first piston, the first piston will be displaced away from the second piston. This will permit the second piston to move toward and away from the first piston in response to fluid pressure against it from the pump discharge chamber, thereby absorbing the fluid displacement from the pump. In a mechanical embodiment, the present invention includes a fixed displacement pump piston connected to a variable capacitance piston by a rocker arm that is pivotal about a movable pivot point.
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