Patent ID: 7412951

Claim:
A valve gear for load-change valves of a four-stroke internal combustion engine having a cylinder head, in which the load-change valves are held in a closed position by spring force, the valve gear comprising: a pivot lever connected to the load-change valve; a cam connected to the cylinder head and having a lifting curve, the cam contacting the pivot lever and rotating to move the pivot lever to open a load-change channel during a first work cycle; an intermediate element engaged by the cam, an engagement region of said intermediate element being positioned on the cam so that the intermediate element is moved by the lifting curve of the cam during rotation of the cam, and adjusts the pivot lever, to open the load-change valve during a second work cycle, wherein the load-change valve is opened to a lesser degree during said second work cycle than during said first work cycle; and an element that can pivot in the cylinder head and is adjustable in its position, said element engaging the cam and the pivot lever, and prismatically guiding the intermediate element, so that a stroke movement of the cam for opening the load-change valve via the pivot lever can be adjusted.