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. 17, 2012
Filed:
Sep. 21, 2006
Hisashi Ono, Okazaki, JP;
Koji Nunami, Anjo, JP;
Hisashi Ono, Okazaki, JP;
Koji Nunami, Anjo, JP;
Aisin Seiki Kabushki Kaisha, Aichi, JP;
Abstract
An oil pump rotor for use in an oil pump includes an inner rotor having (n: 'n' is a natural number) external teeth, an outer rotor having (n+1) internal teeth meshing with the external teeth, and a casing forming a suction port for drawing a fluid and a discharge port for discharging the fluid, such that in association with meshing and co-rotation of the inner and outer rotors, the fluid is drawn/discharged to be conveyed according to volume changes of cells formed between teeth faces of the two rotors. For a tooth profile formed of a mathematical curve and having a tooth addendum circle Awith a radius Rand a tooth root curve Awith a radius R, a circle Dhas a radius Rwhich satisfies Formula (1) and a circle Dhas a radius Rwhich satisfies both Formula (2) and Formula (3),  Formula (1)  Formula (2)  Formula (3)