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:
Aug. 25, 2009
Filed:
May. 10, 2006
Lars Pfutzenreuter, Werdohl, DE;
Lars Pfutzenreuter, Werdohl, DE;
AFT Atlas Fahrzeugtechnik GmbH, Werdohl, DE;
Abstract
A device for variably setting the control times of gas exchange valves of an internal combustion engine is provided having a hydraulic actuator () with two reciprocally operating pressure chambers () and with a pressure medium supply device () for supplying and withdrawing pressure medium to or from the pressure chambers (). The device () also includes at least one rotation angle limiting device () that in an unlocked state does not limit the phasing of the output element () in reference to the input element () but, in a locked state, limits it to a defined angular range or to a defined angle, with the rotation angle limiting device () being switched from the locked to the unlocked state by pressure medium being supplied. A control line () is provided for supplying and withdrawing pressure medium to or from the rotation angle limiting devices (), with the control line () not communicating with the pressure medium supply device (). A control valve () controls the supply and withdrawal of pressure medium to and from the control line (). The control valve () comprises a hydraulic actuating mechanism () that is subjected to the action of pressure medium from the pressure medium supply device ().