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Title:
IMPROVEMENT OF NONCIRCULAR GEAR AND NONCIRCULAR GEAR- TYPE FLOWMETER USING IT
Document Type and Number:
Japanese Patent JP2000346689
Kind Code:
A
Abstract:

To reduce a metering error in a small flow-rate region by reducing the leak amount of a tooth tip gap.

A noncircular gear in an oval gear-type flowmeter is formed of a continuous curve wherein its major axis parts are formed of arcs of r=a/(1-b), its minor axis parts are formed of arcs of r=a/(1+b) and parts between them are connected by oval curves of r=a/[1-b cos (πθ/θ0)] (0≤θ≤θ0) [where (a) represents a similarity factor and (b) represents a flatness degree]. Thereby, the number of teeth of a gear coming into contact with the inner wall surface of a metering chamber is increased, the leakage amount of a tooth tip gap is reduced, and a metering error can be reduced.


Inventors:
HOTTA KOJI
ONO SEIGO
Application Number:
JP1999000162644
Publication Date:
December 15, 2000
Filing Date:
June 09, 1999
Export Citation:
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Assignee:
OVAL CORP
International Classes:
G01F3/10; (IPC1-7): G01F3/10
Attorney, Agent or Firm:
高野 明近