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:
Dec. 28, 2010
Filed:
Jul. 18, 2007
Masakazu Kurata, Yokohama, JP;
Masakazu Kurata, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An internal gear pump has a first port opening into pumping chambers and provided at one side with respect to a first axis interconnecting a confinement portion of the pumping chambers having a maximum volumetric capacity and a deeply-meshed-engagement portion of the pumping chambers having a minimum volumetric capacity, a second port opening into the pumping chambers and provided at the opposite side with respect to the first axis, a first pressure introduction passage intercommunicating the first port and a first-port side area of a clearance space defined on an outer periphery of an outer rotor, and a second pressure introduction passage intercommunicating the second port and a second-port side area of the clearance space. The clearance space of a direction of a second axis perpendicular to the first axis is dimensioned to be greater than the clearance space of a direction of the first axis.