Rotary expansible chamber devices – Working chamber surface expressed mathematically
Patent
1983-10-25
1987-04-14
Cline, William R.
Rotary expansible chamber devices
Working chamber surface expressed mathematically
F01C 100
Patent
active
046574921
ABSTRACT:
A rotary gear pump having inner and outer gear rotors of the type having respective inner and outer surfaces whose cross sections are determined utilizing the trochoidal curve, the inner gear rotor having trochoidal dimensions which either eliminate or diminish to a negligible amount the edge portion of the teeth which cause excessive wear, noise or inefficiency. In one embodiment of the invention, the dimensions of the inner gear rotor are such that C/K.sub.0 .ltoreq.1 or f.sub.c /K.sub.1 .ltoreq.1.1, where C is the rotary path diameter, K.sub.0 =(A/B+1).times..vertline.B-2e.vertline., K.sub.1 =(n+1).times..vertline.1-2f.sub.e .vertline., A is the diameter of the base circle, B is the diameter of the rolling circle, e is the eccentricity, n=A/B, f.sub.e =e/B, and f.sub.c =C/B. In accordance with a second embodiment of the invention, a comparable result can be obtained provided that the number of teeth on the inner gear rotor is equal to an integer closest to the ratio d.sub.4 /2e, wherein d.sub.4 is the minor diameter of the inner rotor.
REFERENCES:
patent: 3091386 (1963-05-01), Paschke
patent: 3117561 (1964-01-01), Bonavera
patent: 3881847 (1975-05-01), Chen
patent: 4395206 (1983-07-01), Hoffmann
J. R. Colbourne, The Geometry of Trochoid Envelopes and Their Application in Rotary Pumps, 1974.
Cline William R.
Cole Richard R.
Sumitomo Electric Industries Ltd.
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