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. 12, 2021
Filed:
May. 30, 2018
Subaru Corporation, Tokyo, JP;
Shinya Horie, Tokyo, JP;
Katsuyuki Namiki, Tokyo, JP;
Atsushi Fujie, Tokyo, JP;
Makoto Saito, Tokyo, JP;
SUBARU CORPORATION, Tokyo, JP;
Abstract
An internal gear pump includes an outer rotor, an inner rotor, and a pump housing. The inner rotor is rotatably disposed inside the outer rotor having internal teeth, forms pump chambers between the outer rotor and the inner rotor, and has external teeth. The pump housing has an inhalation port, a discharge port, and a first notch formed within a first land surface that extends from an end of the inhalation port to an end of the discharge port. The first notch is formed along a projection trajectory obtained by projecting a trajectory of chip points on the first land surface, where each chip point is a middle point between a corresponding one of the internal teeth and a corresponding one of the external teeth at a location at which the internal and external teeth substantially face each other above the first land surface and are closest to each other.