Cavitation-free gear pump

Details Cavitation-free gear pump Cavitation-free gear pump

1998-03-13

2000-09-26

Denion, Thomas

Rotary expansible chamber devices

Interengaging rotating members

F01C 108

Patent

active

061235334

ABSTRACT:
A positive displacement gear pump useful for pumping hydraulic fluid includes a drive gear and an idler gear. In a first embodiment, the drive gear has symmetrical teeth, whereas the idler gear has asymmetrical teeth. The asymmetrical teeth of the idler gear include working surfaces which have a profile corresponding to the profile of the working and non-working surfaces of the drive gear, but have a non-working surface which has been relieved so as to be substantially flat. Consequently, in the zone of the pump where the gears mesh, a large backlash is created which substantially prevents bubble formation. In a second embodiment, the drive gear, as well as the idler gear, have non-contact surfaces which are substantially flat to create even a larger backlash for relieving cavitation when the teeth are made wider in the axial direction. By preventing bubble formation, cavitation which occurs at high pump speeds is substantially eliminated, thus avoiding pump damage which results from cavitation.

REFERENCES:
patent: 171651 (1876-01-01), Crocker
patent: 1633793 (1927-06-01), Porst
patent: 2601004 (1952-06-01), Cintron
patent: 2845031 (1958-07-01), Guibert
patent: 3439625 (1969-04-01), Warne
patent: 3981646 (1976-09-01), Bottoms
patent: 4233003 (1980-11-01), Jeng
patent: 5145349 (1992-09-01), McBurnett

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