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:
Feb. 21, 2012
Filed:
Sep. 07, 2006
Jens Hoppe, Erlangen, DE;
Andreas Rohr, Heroldsbach, DE;
Jens Hoppe, Erlangen, DE;
Andreas Rohr, Heroldsbach, DE;
Schaeffler Technologies GmbH & Co. KG, Herzogenaurach, DE;
Abstract
A control valve for a hydraulic adjuster for the camshaft of an internal combustion engine is provided, wherein an actuator acts on a pressure part () embedded in a control piston (). In order to prevent the piston () from being blocked in the valve housing by the expansion thereof caused by the pressure part embedment, the pressure part () and/or the control piston () is/are provided with radial recesses () in the embedment area () which make it possible to limit joining forces and the resulting radial expansion of the piston (). Alternatively or in addition, the external surface of the control valve () has a reduced cross-section in the embedment area ().