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:
Nov. 04, 2014
Filed:
Nov. 02, 2010
Masato Uozumi, Itami, JP;
Harumitsu Sasaki, Itami, JP;
Kentaro Yoshida, Itami, JP;
Sumitomo Electric Sintered Alloy, Ltd., Takahashi-shi, JP;
Abstract
An object is to meet the demands for increasing the number of teeth of a rotor in an internal gear pump while maintaining a theoretical discharge amount by using an equivalent body configuration so as to enhance the pump performance relating to discharge pulsation due to the increased number of teeth. In a pump rotorformed by combining of an inner rotor () having N teeth and an outer rotor () having (N+1) teeth and disposing the rotors eccentrically relative to each other, the relational expression φD<1.7·sin(π/180)/sin {π/(180·)} is satisfied, φDbeing a maximum value of a working pitch diameter of the inner rotor () and the outer rotor (), and a working position (G) of the inner rotor () and the outer rotor () is always located rearward of an eccentric axis (CL) in a rotating direction of the rotor.