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:
May. 17, 2005
Filed:
Sep. 07, 2001
Reinhard Pippes, Bretten-Sprantal, DE;
Reinhard Pippes, Bretten-Sprantal, DE;
Eckerle Industrie-Elektronik GmbH, Malsch, DE;
Abstract
The invention relates to an internal geared wheel pump without a filler piece, comprising a housing, an internal geared wheel () which rotates in the housing and an external geared pinion () which is rotationally mounted in the housing and which meshes with the geared wheel. The teeth of the pinion define a suction area and a pressure area in the gearing, by complete engagement with the tooth spaces of the geared wheel and by sealing contact with tooth crowns of the geared wheel in an engagement-free geared wheel area which lies approximately diametrically opposite the tooth space engagement. The toothing of the geared wheel and the pinion is an involute or cycloid toothing, the tooth crowns having a rounded peripheral surface (). The tooth crowns of the geared wheel () and/or the pinion () are asymmetrically rounded in relation to a centre line () of each tooth (), in such a way that a transition line () between the tooth face () and the peripheral surface () is located on the rear tooth face () (in the direction of rotation) for the geared wheel and on the front tooth face () (in the direction of rotation) for the pinion, closer to the tooth base than on the opposite tooth face, respectively.