Oscillating lever in a valve train of an internal-combustion engine

Abstract

A rocker or swing arm in a valve train of an internal combustion engine has a bearing bore pivotally supporting the arm on a hollow axis located in a fixed position in the engine. The valve train has a camshaft with cams for causing the arm to pivot. A hydraulic valve lash compensation element that acts on the tappet of a gas exchange valve connects to the arm. A supply line is arranged in the arm, and a radial opening connecting the hollow interior space of the axis to the supply line is arranged in the axis in the region of the arm to deliver hydraulic means through the hollow axis to the lash compensation element. According to the invention, a A labyrinth seal (35) surrounding the hollow axis without contact is arranged on the arm at each axial end of the bearing bore. The bearing space of the arm is laterally sealed by this means.

1 . Rocker arm or swing arm in a valve train of an internal combustion engine, having a bearing bore ( 27 ) by means of which the arm is supported in a pivoting manner on a hollow axis located in a fixed position in the engine, characterized in that a labyrinth seal ( 35 ) surrounding the hollow axis without contact is arranged on the arm ( 26 ) at each axial end of the bearing bore ( 27 ), by which means the bearing space of the arm ( 26 ) is laterally sealed. 
     
     
         2 . Arm according to  claim 1 , characterized in that the valve train has a camshaft with cams for producing the pivoting motion of the arm ( 26 ), with a hydraulic valve lash compensation element ( 28 ) that is connected to the arm ( 26 ) and that acts on the tappet of a gas exchange valve, wherein a supply line ( 33 ) is arranged in the arm ( 26 ), and a radial opening connecting the hollow interior space of the axis to the supply line ( 33 ) is arranged in the axis in the region of the arm ( 26 ), in order to deliver hydraulic means through the hollow axis to the valve lash compensation element ( 28 ). 
     
     
         3 . Arm according to  claim 2 , characterized in that it has a roller bearing ( 31 ) in its bearing bore ( 27 ) with which it is supported on the hollow axis in a pivoting manner. 
     
     
         4 . Arm according to  claim 3 , characterized in that the roller bearing ( 31 ) is of single-row design. 
     
     
         5 . Arm according to  claim 3 , characterized in that the roller bearing ( 31 ) is of multi-row design. 
     
     
         6 . Arm according to  claim 5 , characterized in that the roller bearing ( 31 ) is of double-row design with a cage ( 30 ) guiding the rollers ( 32 ), in the center of which cage is located at least one transfer opening ( 34 ) for hydraulic means connected to the radial opening of the axis. 
     
     
         7 . Arm according to  claim 2 , characterized in that it is implemented as a rocker arm in which the valve lash compensation element ( 28 ) is located at one end and the bearing bore ( 27 ) is located in the center region. 
     
     
         8 . Arm according to  claim 2 , characterized in that it is implemented as a swing arm in which the valve lash compensation element ( 28 ) is located at one end and the bearing bore is located at the other end. 
     
     
         9 . Arm according to  claim 2 , characterized in that a mechanical arm insert ( 29 ) or arm adjusting screw is connected to the arm ( 26 ) at one end.