Patent ID: 8904977
Filing Date: 2014-12-09
Classification: F01L

Abstract:
1. A valve drive device for switching the stroke of gas exchange valves of an internal combustion engine comprising: at least one camshaft configured, at least in part, as a hollow shaft; at least one cam unit including at least two different cams disposed on the at least one camshaft so as to be rotationally engaged and axially displaceable with respect thereto; at least one adjustment sleeve disposed so as to be rotationally engaged on an adjustment shaft and so as to be rotatable and axially displaceable inside the at least one camshaft, the at least one adjustment sleeve including thereon a closed adjustment contour extending about a circumference of the at least one adjustment sleeve and being operatively connected to the at least one cam unit through an adjustment clearance in the at least one camshaft via a first coupling element configured to permanently engage in the adjustment contour; and a further coupling element configured to permanently engage in the adjustment contour and connect to the at least one camshaft so as to be fixed in position.