Rotary gear pump having asymmetrical convex tooth profiles

Details Rotary gear pump having asymmetrical convex tooth profiles Rotary gear pump having asymmetrical convex tooth profiles

1996-04-01

1997-11-11

Vrablik, John J.

Rotary expansible chamber devices

Moving cylinder

Rotating

F04C 210

Patent

active

056857047

ABSTRACT:
A rotary displacement pump having a rotatable gear rotor is disclosed, the gear rotor having an outer ring gear with a plurality of internal teeth engaging the external teeth on a pinion gear which is, in turn, attached to a rotatable shaft. The ring gear has an outer diameter that is approximately equal to the diameter of the root circle of the internal gear teeth such that the plurality of teeth are circumferentially spaced apart to form generally radial passageways. The ring gear has one or more annular portions connecting the plurality of internal gear teeth. Each of the internal gear teeth has a forward portion and a rear portion, measured in the direction of rotation of the ring gear, with a tooth profile having a convex forward portion with a radius R1 and a convex rear portion having a radius R2 such that R1>R2. The annular portion of the ring gear may have an outer diameter greater than that of the portion of the ring gear forming the internal gear teeth and a single such annular portion may be utilized to connect the plurality of internal teeth such that all the teeth extend from the single annular portion in cantilever fashion.

REFERENCES:
patent: 1753476 (1930-04-01), Richer
patent: 2053919 (1936-09-01), Pigott
patent: 2458958 (1949-01-01), Pigott et al.
patent: 2760438 (1956-08-01), Hill
patent: 2822760 (1958-02-01), Schirmer et al.
patent: 3361074 (1968-01-01), Eckerle
patent: 3758244 (1973-09-01), Gerber

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