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:
Jun. 03, 1986
Filed:
Sep. 17, 1985
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Aisin Seiki Kabushiki Kaisha, Aichi, JP;
Abstract
This internal gear pump has: a pump housing formed with a rotor receiving cavity which has a cylindrical circumferential inner wall surface; an outer rotor formed with a generally cylindrical outer surface which fits closely and coaxially in the cylindrical circumferential inner wall surface of the rotor receiving cavity and is rotatable around their mutual central axis within the pump housing, and which is further formed with an inner cavity the defining surface of which is formed with a plurality of internally facing teeth; and an inner rotor, somewhat smaller than the inner cavity of the outer rotor, which is formed with a plurality of externally facing teeth which mesh and cooperate with the internally facing teeth of the outer rotor. A pumping chamber is defined between the outer surface of the inner rotor and the inner surface of the outer rotor between the mutually meshing teeth thereof. An aperture is formed in the pump housing to define an intake plenum, and this aperture opens to define an intake port structure through several portions of the circumferential inner wall surface of the rotor receiving cavity, at least one remaining portion of the circumferential inner wall surface of the rotor receiving cavity intervening between separate such several portions of the circumferential wall surface of the rotor receiving cavity which are removed to allow the intake port structure to open therethrough.