The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2011
Filed:
Mar. 06, 2008
Seigo Ono, Tokyo, JP;
Katsuichi Uchida, Tokyo, JP;
Seigo Ono, Tokyo, JP;
Katsuichi Uchida, Tokyo, JP;
Oval Corporation, Tokyo, JP;
Abstract
A position displacement flowmeter having a pair of non-circular gears in a rolling contact on a pitch line without slippage. The positive displacement flowmeter comprises a casing and a pair of rotors provided in the casing and rotatable around its center axes. The pair of rotors, have a tooth profile curve which is an oval pitch curve itself having a trajectory of contact points on the pitch line, and they satisfy a condition of rrK=const rdθ=rdθ, and a moving radius of the oval pitch curve is given by ri=a/(1−b cos nθi) (i=1, 2), where 'ri (i=1, 2)' is the moving radius that is a distance from a center of rotation to the oval pitch curve, 'a' is a homothetic coefficient, “b” is a flattening, “n” is a number of lobes, and “θi (i=1, 2) is a moving angle.