Rotary expansible chamber devices – Trapped fluid relief – With tooth modification
Patent
1997-09-12
2000-04-11
Vrablik, John J.
Rotary expansible chamber devices
Trapped fluid relief
With tooth modification
4182065, 73261, F04C 218, G01F 308
Patent
active
060481862
ABSTRACT:
A pair of elliptic gear wheels to be installed in a metering chamber casing of positive displacement type flow meters and have a modified gear wheel and the change of gear form of an effective gearing pressure angle of an involute gear form side of long radius and of an elimination of trapping phenomenon of cycloid gear form of short radius of wheels. This pair of gear wheels has super precision measuring functions and excellent repeatability, by utilizing a computer which compensates flow rate errors instantaneously and send signals for indicating corrected values. Meshing of the pair of wheels at a top of an involute gear form on a middle portion of a pitch circle can keep meshing of the pair of wheels and a cycloid gear form side of short radius eliminates trapping phenomenon. This pair of modified gear wheels has features that metering errors caused by the trapping phenomenon between meshed gear teeth will be eliminated by an effect of the cycloid gear form and the involute gear form side of long radius keeps meshing of each coupled gear wheel.
REFERENCES:
patent: 231939 (1880-09-01), Shedd
patent: 2897765 (1959-08-01), Kitano
patent: 5454702 (1995-10-01), Weidhass
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