Valve train for an internal combustion engine

Abstract

A valve train for an internal combustion engine is provided. The valve train includes at least one rocker arm. The at least one rocker arm is mounted at a bearing. Further, the at least one rocker arm can be moved around the bearing by an actuating element. The valve train also includes at least one valve actuating element, wherein the at least one valve actuating element can be moved by the at least one rocker arm. At least one valve can be actuated by this movement of the at least one valve actuating element. A fluid element is arranged between the at least one valve actuating element and the at least one rocker arm. The fluid element comprises at least one cavity for a fluid. The volume of the fluid in the at least one cavity can be varied by moving a piston, and the at least one valve actuating element constitutes or is mounted on the piston.

1 . A valve train for an internal combustion engine, comprising:
 at least one rocker arm, wherein the at least one rocker arm is mounted at a bearing, and wherein the at least one rocker arm can be moved around the bearing by an actuating element;   at least one valve actuating element, wherein the at least one valve actuating element can be moved by the at least one rocker arm, and wherein at least one valve of an internal combustion engine can be moved by this movement of the at least one valve actuating element; and   a fluid element arranged between the at least one valve actuating element and the at least one rocker arm, wherein   the fluid element comprises at least one cavity for a fluid, and   wherein a volume of the fluid in the at least one cavity can be varied by varying a position of the at least one valve actuating element relative to the at least one rocker arm.   
     
     
         2 . The valve train for the internal combustion engine according to  claim 1 , wherein the at least one cavity is in fluid communication with a fluid supplier through a conduct. 
     
     
         3 . The valve train for the internal combustion engine according to  claim 2 , wherein the conduct is a bore arranged in the rocker arm. 
     
     
         4 . The valve train for the internal combustion engine according to  claim 2 , wherein a lubrication of the at least one bearing is provided, wherein a fluid for the lubrication of the at least one bearing is provided, which corresponds to the fluid used in the at least one cavity, and wherein the lubrication of the bearing serves as a fluid supply. 
     
     
         5 . The valve train for the internal combustion engine according to  claim 4 , wherein a piston is used as the at least one valve actuating element. 
     
     
         6 . The valve train for the internal combustion engine according to  claim 1 , wherein the volume of the fluid in the at least one cavity can be varied in a non-actuated position of the at least one valve. 
     
     
         7 . The valve train for the internal combustion engine according to  claim 2 , wherein the conduct of the at least one cavity can be closed so that the volume of the fluid in the at least one cavity can be held essentially constant in an actuated and/or during an actuating movement of the at least one valve. 
     
     
         8 . The valve train for the internal combustion engine according to  claim 1 , further comprising at least one valve bridge provided for actuating at least two valves, wherein the at least one cavity is arranged between the at least one valve bridge and the at least one valve. 
     
     
         9 . The valve train for the internal combustion engine according to  claim 2 , further comprising a conduct arranged in the at least one valve bridge to connect the at least one cavity with the fluid supplier. 
     
     
         10 . The valve train for the internal combustion engine according to  claim 9 , wherein the conduct can be closed at least partially according to a position of the at least one valve bridge. 
     
     
         11 . The valve train for the internal combustion engine according to  claim 3 , wherein the bearing has a shaft, wherein the bearing allows a rotational movement of the at least one rocker arm around the shaft, wherein a lubrication is provided between the shaft and the at least one rocker arm, and wherein the conduct connects the at least one cavity with the bearing. 
     
     
         12 . The valve train for the internal combustion engine according to  claim 1 , further comprising at least one supply-pin supplying the at least one cavity with fluid. 
     
     
         13 . The valve train for the internal combustion engine according to  claim 11 , wherein the at least one rocker arm or at least one valve bridge has at least one supply-pin plunging recess, in which the at least one supply-pin can plunge at least partially. 
     
     
         14 . The internal combustion engine, comprising the valve train according to  claim 1 . 
     
     
         15 . A method for operating the valve train according to  claim 1 , comprising:
 actuating at least one valve by at least one valve actuating element, with the at least one valve actuating element moved by at least one rocker arm; and adjusting a position of the at least one valve actuating element relative to the at least one valve by varying a volume of fluid in a fluid element, thereby automatically adjusting valve lash or automatically avoiding valve lash.