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. 09, 2014
Filed:
Oct. 07, 2009
Roman Kern, Forchheim, DE;
Reinhard Koch, Wachenroth, DE;
Roman Kern, Forchheim, DE;
Reinhard Koch, Wachenroth, DE;
Schaeffler Technologies GmbH & Co. KG, Herzogenaurach, DE;
Abstract
A hydraulic tensioning device () for a flexible drive element, particularly for a chain or a belt, is provided, and includes a housing () that has a cylindrical inner surface () at least in some regions, a piston () is arranged in the housing () in an axially displaceable manner, and an inner chamber () is formed by the housing () and the piston () for receiving hydraulic fluid. At least one vent hole () is integrated in the housing () and/or in the piston () is in contact with the surroundings (U). In order to provide a reliably ventilated system that has a simple design and that can be implemented in a cost-effective manner, a sealing element () is arranged in a region of the vent hole (), and the sealing element is permeable to gas but not to hydraulic fluid.