Internal gear pump including a crescent

Details Internal gear pump including a crescent Internal gear pump including a crescent

2007-07-02

2009-12-01

Denion, Thomas E (Department: 3748)

Rotary expansible chamber devices

Moving cylinder

Rotating

C418S169000, C418S171000

Reexamination Certificate

active

07625192

ABSTRACT:
To provide an internal gear pump capable of preventing small vibrations due to pressure differences at the outlet port side of a crescent disposed between the outer rotor and the inner rotor, so that fatigue failure does not occur in the crescent over a long time period, whereby the durability can be increased. The internal gear pump includes a rotor unit, in which an inner rotor is disposed within an outer rotor on the inner peripheral side and a crescent is disposed in the gap between the inner rotor and the outer rotor, the rotor unit being housed in a pump casing. Outer cells are formed by the crescent and the outer rotor. Inner cells are formed by the crescent and the inner rotor. Linking of the outer cells and the outlet port, and linking of the inner cells6and the outlet port, start substantially simultaneously.

REFERENCES:
patent: 2774309 (1956-12-01), Stoyke et al.
patent: 3676027 (1972-07-01), Molly
patent: 3785756 (1974-01-01), Langenderfer
patent: 4155686 (1979-05-01), Eisenmann et al.
patent: 4386892 (1983-06-01), Stich et al.
patent: 5032069 (1991-07-01), Parsons
patent: 5360325 (1994-11-01), Henry et al.
patent: 5660531 (1997-08-01), Merkle et al.
patent: 6089841 (2000-07-01), Meernik et al.
patent: 6817843 (2004-11-01), Leising et al.
patent: 50-48353 (1975-04-01), None
patent: 54-30506 (1979-03-01), None
patent: 54-63409 (1979-05-01), None
patent: 58-158183 (1983-10-01), None
patent: 59-131787 (1984-07-01), None
Japanese Office Action dated Aug. 4, 2009 with English-language Translation.

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