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:
Mar. 21, 1995
Filed:
Dec. 07, 1992
Peter Peiz, Heidenheim, DE;
Franz Arbogast, Heidenheim, DE;
J. M. Voith GmbH, Heidenheim, DE;
Abstract
The invention is directed to a sickleless internal gear pump including an internal ring gear and a pinion meshing with the ring gear. The internal ring gear and pinion having a common width and a plurality of teeth extending across the width. Each tooth has a tooth head with an involute profile. Each ring gear tooth includes a tooth head having a slot therein. The ring gear has a plurality of radial ports. A housing rotatably carries the internal ring gear and the pinion, and includes a suction port, a pressure port and an axial expanse corresponding to the teeth width. A plurality of sealing elements are respectively disposed in the ring gear tooth head slots. The sealing elements are radially movably disposed in the slots, and each sealing element defines an end face of the tooth head. The end face has an exterior profile corresponding to the involute profile. Each sealing element comprises a stop surface and a fixed stop. Each slot has a shape corresponding to and coacting with the stop surface and the fixed stop for limiting the radial movement of the sealing elements.