Variable displacement gear pump

Details Variable displacement gear pump Variable displacement gear pump

1977-04-22

1978-06-27

Croyle, Carlton R.

Rotary expansible chamber devices

With changeable working chamber magnitude

Intermeshing rotary members

418 26, 418 30, 418170, F04C 1504, F04C 106

Patent

active

040972046

ABSTRACT:
An internal-external gear pump wherein the fluid displacement thereof is variable. The internal gear is rotatably driven by a drive shaft about a fixed axis and the external gear is rotatably driven by the internal gear about a controlled movable axis eccentric to the fixed axis. Movement of the external gear axis causes the eccentricity between the internal and external gear axes to vary, thereby resulting in a change in the depth of gear tooth mesh such that the volume of fluid displaced by the meshing teeth is varied. The position of the external gear axis is established by a control ring which rotatably supports the external gear, and is mounted in a stationary housing so as to be rotatably positionable within arcuate limits about a fixed axis eccentric to both the axes of the internal and external gears.

REFERENCES:
patent: 2948228 (1960-08-01), Ahlen
patent: 3491698 (1970-01-01), Truninger

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