Rotary expansible chamber devices – Working chamber surface expressed mathematically
Patent
1985-05-08
1987-06-16
Vrablik, John J.
Rotary expansible chamber devices
Working chamber surface expressed mathematically
418166, 418171, 74462, 74804, F04C 210, F16H 5508
Patent
active
046733426
ABSTRACT:
A rotary pump device and an inner gear rotor therefore in which the inner gear rotor has a outer peripheral profile surface whose cross section perpendicular to its central axis is in the form of an inner envelope curve derived by moving a locus circle on an epitrochoidal curve. If the epitrochoidal curve is defined by a base circle of diameter A, a rolling circle of diameter B and an eccentricity of length e, and the locus circle has a diameter C, the inner rotor therefor having an eccentricity ratio f.sub.e =e/B, a locus circle ratio f.sub.c =C/B and a base circle ratio n=A/B, the ratios f.sub.e, f.sub.c and n are selected so as to make the inner envelope curve smooth without any edge portions by selecting the ratios to have values such that f.sub.c /K.sub.i .ltoreq.1.1, wherein K.sub.i =(n+1).times..vertline.1-2f.sub.e .vertline.. The inner gear rotor is rotatable in an outer gear rotor having circularly arched radially inwardly extending teeth.
REFERENCES:
patent: 2965039 (1960-12-01), Morita
patent: 4504202 (1985-03-01), Saegusa
patent: 4518332 (1985-05-01), Saegusa
Sumitomo Electric Industries Ltd.
Vrablik John J.
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