Gear pump or motor with a shaftless gear

Details Gear pump or motor with a shaftless gear Gear pump or motor with a shaftless gear

1981-05-04

1983-06-07

Vrablik, John J.

Rotary expansible chamber devices

Interengaging rotating members

418196, F01C 120, F03C 208, F04C 220

Patent

active

043868932

ABSTRACT:
In a gear pump or motor having a housing and at least two intermeshing gears, one of the gears being fixed to a rotatable shaft and the other being a shaftless gear having a plurality of gear teeth rotatable on a film of fluid in close proximity to an interior surface of the housing, the improvement being a unique tooth profile on the shaftless gear. Each gear tooth on the shaftless gear has a thick top land, preferably at least twice as thick as the top land on each gear tooth on the gear fixed to the rotatable shaft. This particular intermeshing gear tooth configuration increases the bearing surface of the shaftless gear on the film of fluid within the interior of the housing to better support the shaftless gear and thereby reduce frictional wear.

REFERENCES:
patent: 137056 (1873-03-01), Chapman
patent: 2626570 (1953-01-01), Armington et al.
patent: 2699122 (1955-01-01), Erickson
patent: 2760381 (1956-08-01), Pickles
patent: 3120190 (1964-02-01), Schmitter et al.
patent: 3286643 (1966-11-01), Andrews et al.
patent: 3297006 (1967-01-01), Marshall

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