Device for variably adjusting the valve timing of gas exchange valves of an internal combustion engine

Abstract

A device for variably adjusting valve timing of gas exchange valves of an internal combustion engine which has an input element an output element and a camshaft. The input element can be brought into driving connection with a crankshaft. The output element is non-rotationally connected to the camshaft and swivelable in relation to the input element. At least one first pressure chamber is provided. A phase position between the output and input element is modifiable by supplying a pressure medium to or discharging a pressure medium from the pressure chamber. An axial lateral face of the camshaft rests against an axial lateral face of the output element. The camshaft has at least one first pressure medium line with a first opening on the axial lateral face. The output element has at least one second pressure medium line with a second opening, axially opposite the first opening, on the axial lateral face.

1 . A device for variably adjusting a valve timing of gas exchange valves of an internal combustion engine, comprising:
 a drive element; an output element; and a camshaft,   it being possible for the drive element to be brought into a drive connection with a crankshaft of the internal combustion engine,   the output element being connected fixedly to the camshaft so as to rotate with the camshaft and being arranged pivotably with respect to the drive element,   at least one first pressure chamber being provided,   a phase relation between the output element and the drive element being variable as a result of a feeding of pressure medium to or a discharge of pressure medium from the first pressure chamber,   an axial side face of the camshaft bearing against an axial side face of the output element,   the camshaft having at least one first pressure medium line with a first opening on an axial side face,   the output element having at least one second pressure medium line with a second opening on an axial side face and opening into the first pressure chamber, and   the first opening lying axially opposite the second opening,   wherein a throughflow area of the first or the second opening (larger opening) is of larger configuration than a throughflow area of the pressure medium line of the other opening.   
     
     
         2 . The device as claimed in  claim 1 , wherein the throughflow area of the first opening is of larger configuration than the throughflow area of the second pressure medium line and in that the throughflow area of the second opening is of larger configuration than the throughflow area of the first pressure medium line. 
     
     
         3 . The device as claimed in  claim 1 , wherein the throughflow area of the first or the second opening (larger opening) is of larger configuration than the throughflow area of the other opening. 
     
     
         4 . The device as claimed in  claim 3 , wherein an extent of the larger opening in a radial direction of the camshaft is larger than an extent of the other opening in the radial direction of the camshaft. 
     
     
         5 . The device as claimed in  claim 3 , wherein the extent of the larger opening in the circumferential direction of the camshaft is larger than the extent of the other opening in the circumferential direction of the camshaft. 
     
     
         6 . The device as claimed in  claim 1 , wherein the larger opening has a funnel-shaped extension to the side face of the component which lies opposite. 
     
     
         7 . The device as claimed in  claim 1 , wherein the larger opening is configured as a groove. 
     
     
         8 . The device as claimed in  claim 1 , wherein the output element or the camshaft has a positively locking means and the other component has a mating positively locking element for receiving the positively locking element, the positively locking element being configured in one piece with the respective component. 
     
     
         9 . The device as claimed in  claim 6 , wherein the positively locking element is formed on the output element and is configured as a local axial elevation.