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. 21, 2014
Filed:
Aug. 04, 2009
Masato Uozumi, Itami, JP;
Harumitsu Sasaki, Itami, JP;
Kentaro Yoshida, Itami, JP;
Yuichirou Egami, Takahashi, JP;
Masato Uozumi, Itami, JP;
Harumitsu Sasaki, Itami, JP;
Kentaro Yoshida, Itami, JP;
Yuichirou Egami, Takahashi, JP;
Sumitomo Electric Sintered Alloy, Ltd., Takahashi-shi, JP;
Abstract
A gear pump rotor is provided including a combination of an inner rotor and an outer rotor whose numbers of teeth are different by one, and the discharge amount of the pump is increased by an increase of the tooth depth. At least one of an addendum curve and a dedendum curve of an inner rotor is formed by a locus of one point on formation circles that satisfy moving conditions that the formation circles move from moving start points to moving end points while changing the distances from an inner rotor center to the centers of the formation circles. The centers of the formation circles move by a distance in the radial direction of a base circle, and the formation circles rotate by an angle at a constant angular velocity in the same directions of the moving directions of the formation circles.