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:
Sep. 14, 1999
Filed:
Apr. 27, 1998
Dieter Kraxner, Wurmberg, DE;
Dietmar Schwarzenthal, Ditzingen, DE;
Joachim Gruenberger, Sachsenheim, DE;
Dr. Ing. H.C.F. Porsche AG, , DE;
Abstract
An internal-combustion engine valve gear has at least two adjacent stroke transmitting elements which, by way of a hydraulically displaceable coupling element, in a coupled position can be displaced with respect to one another and, in the uncoupled position, can be displaced independently of one another. The stroke transmitting elements interact with the cam of a camshaft having different cam paths which interact with different stroke courses with the stroke transmitting elements. In order to avoid undefined switching conditions in the operation of the internal-combustion engine and, during each switching operation have sufficient time for the displacement of the coupling element, this coupling element interacts with a locking element which locks and unlocks the coupling element as a function of the cam path.