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:
Jul. 26, 1994
Filed:
Apr. 28, 1993
Dieter Voight, Wolfsburg, DE;
Horst-Gunter Hilderts, Wolfsburg, DE;
Volkswagen AG, Wolfsburg, DE;
Abstract
A camshaft has a deactivatable cam which is selectively couplable to or releasable from the camshaft by a coupling pin which is transversely displaceable in a recess in the camshaft. To move the coupling pin between its connecting position, in which it engages a coupling recess in the cam, and its release position, in which it is retracted within the confines of the camshaft, the face of the coupling pin opposite the coupling recess forms a pressure chamber in which variable pressure is controlled by a displaceable control piston. A high pressure is applied to move the coupling pin into its connecting position and a lower pressure is applied to maintain the coupling pin in the connecting position, while a further reduced pressure is applied to retract the coupling pin into its release position.