Fixed displacement pump with variable capacitance flow regulator

Details Fixed displacement pump with variable capacitance flow regulator Fixed displacement pump with variable capacitance flow regulator

1981-03-26

1983-06-14

Freeh, William L.

Pumps

Expansible chamber type

Having pulsation dampening fluid receiving space

138 30, 138 31, 60469, 92 133, F04B 3900, F04B 2300, F16L 5504

Patent

active

043880525

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. The movable pivot point is positioned in response to pressure in the hydraulic system or in response to a control signal that is generated by a control device such as a centrifugal governor or speed control mechanism. Movement of the rocker arm pivot point permits the variable capacitance piston to absorb the pump piston output thereby reducing output flow from the pump until the absorption volume of the variable capacitance piston substantially equals the pump piston output volume.

REFERENCES:
patent: 3230977 (1966-01-01), Mercier
patent: 3362346 (1968-01-01), Bottoms
patent: 3487855 (1970-01-01), Lautenberger
patent: 3906839 (1975-09-01), Schexnayder
patent: 3985063 (1976-10-01), Lemon
patent: 4000758 (1977-01-01), Meisenheimer
patent: 4138846 (1979-02-01), Sakakibara
patent: 4201522 (1980-05-01), Toyota

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