Gear ring pump having a housing wall with a hollow cone recess

Details Gear ring pump having a housing wall with a hollow cone recess Gear ring pump having a housing wall with a hollow cone recess

2000-08-25

2001-08-28

Vrablik, John J. (Department: 3748)

Rotary expansible chamber devices

Grooved abutting cylinder-rotating member end surfaces

C418S171000

Reexamination Certificate

active

06280167

ABSTRACT:

PRIOR ART
The invention is based on a gear pump which is driven by an electric drive motor.
One such gear pump is already known (German Patent Disclosure DE 22 49 395 A1), whose second wall of the housing is provided with countersunk features of appropriate outline that are axially opposite both the crescent-shaped intake opening and the crescent-shaped pressure opening of the first side wall. The countersunk features, embodied with sharp edges, have a bottom extending parallel to the end face toward the gear wheel of the side wall and the countersunk features have walls protruding upward at a right angle. The purpose of the countersunk features is to compensate for axial forces engendered by the fluid to be pumped and exerted by the intake opening and in particular by the pressure opening on the gear ring, and to improve the running properties and the wear performance of the gear pump. However, the countersunk features can be produced only at relatively great expense and are designed unfavorably from the standpoint of lubrication technology.
ADVANTAGES OF THE INVENTION
The gear pump of the invention has an advantage over the prior art that on the one hand the countersunk feature can be created by metal-cutting machining using a simple tool, and on the other, a load-bearing film of fluid from the countersunk feature can favorably form between the gear ring and the second side wall of the housing, which considerably improves the wear resistance of the gear pump.
Expedient features and refinements of the gear pump of the invention are set forth hereinafter.


REFERENCES:
patent: 2872872 (1959-02-01), Quintilian
patent: 4968233 (1990-11-01), Nakayoshi et al.
patent: 2249395 (1973-06-01), None

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