Valve Drive for an Internal Combustion Engine

Abstract

A valve drive for an internal combustion engine has a first camshaft which is rotatably mounted in a first and a second camshaft bearing and which includes at least one cam with a first cam curve and a second cam curve that differs from the first cam curve, wherein a gas exchange valve can be actuated by the first or the second cam curve. A camshaft section is provided, by which the cam can be moved by an actuator such that the gas exchange valve can be actuated either via the first or the second cam curve. The first camshaft and the cam have a fixed position relative to each other. The first camshaft can be axially moved in the first and the second camshaft bearing.

What is claimed is: 
     
         1 . A valve drive for a cylinder head of an internal combustion engine, comprising:
 a first camshaft mounted rotatably in a first and a second camshaft bearing, wherein   the first cam shaft has at least one cam with a first cam lobe and a second cam lobe which is different than the first cam lobe, a gas exchange valve being actuatable by way of the first or the second cam lobe,   the first camshaft has a camshaft section by way of which the cam is displaceable via an actuator such that the gas exchange valve is actuatable via either the first or the second cam lobe,   the first camshaft and the cam have a fixed position with respect to one another, and   the first camshaft is displaceable axially in the first and the second camshaft bearing.   
     
     
         2 . The valve drive according to  claim 1 , wherein
 the cam and the camshaft are in one piece and are made from the same material.   
     
     
         3 . The valve drive according to  claim 1 , wherein
 the cam is joined or shrunk-fit onto the camshaft.   
     
     
         4 . The valve drive according to  claim 1 , wherein
 the camshaft is hollow.   
     
     
         5 . The valve drive according to  claim 1 , further comprising:
 a second camshaft mounted rotatably in a third and a fourth camshaft bearing and arranged in parallel with respect to the first camshaft;   a first spur gearwheel arranged radially around the first camshaft;   a second spur gearwheel arranged radially around the second camshaft; and   a third spur gearwheel by which the first spur gearwheel and the second spur gearwheel are operatively connected to one another.   
     
     
         6 . The valve drive according to  claim 1 , wherein
 the first camshaft has a plurality of cams each having two cam lobes, and   the first camshaft is provided for at least two cylinders of the internal combustion engine which are arranged inline.