Variable mechanical valve timing mechanism having an adjusting device

Abstract

A variable mechanical valve timing mechanism for adjusting the stroke of gas exchange valves in a reciprocating-piston internal combustion engine, having a plurality of cams ( 5 ) which are fastened to a camshaft ( 4 ), having a plurality of gas exchange valves ( 1 ) and valve actuating elements ( 2 ), having adjusting units which have a plurality of adjusting elements ( 7 ) which are fastened to at least one rotatable adjusting shaft ( 6 ), having transmission apparatuses which comprise transmission elements ( 8 ), the transmission elements ( 8 ) being operatively connected to the cams ( 5 ), to the valve actuating elements ( 2 ) and to the adjusting elements ( 7 ) directly or with the interconnection of transmission members (adjusting rollers, cam rollers), and having at least one adjusting device on the rotatable adjusting shaft ( 6 ), the adjusting shaft/shafts ( 6 ) and adjusting elements ( 7 ) being configured and arranged in such a way and/or the number and position of the adjusting devices (adjusting levers 10 ) being selected in such a way that all of the gas exchange valves ( 1 ) have substantially the same stroke adjustment in relation to one another.

1 . A variable mechanical valve timing mechanism for adjusting the stroke of gas exchange valves in a reciprocating-piston internal combustion engine, having a plurality of cams ( 5 ) which are fastened to a camshaft ( 4 ), having a plurality of gas exchange valves ( 1 ) and valve actuating elements ( 2 ), having adjusting units which have a plurality of adjusting elements ( 7 ) which are fastened to at least one rotatable adjusting shaft ( 6 ), having transmission apparatuses which comprise transmission elements ( 8 ), the transmission elements ( 8 ) being operatively connected to the cams ( 5 ), to the valve actuating elements ( 2 ) and to the adjusting elements ( 7 ) directly or with the interconnection of transmission members (adjusting rollers, cam rollers), and having at least one adjusting device on the rotatable adjusting shaft ( 6 ), characterized in that the adjusting shaft/shafts ( 6 ) and adjusting elements ( 7 ) are configured and arranged in such a way and/or the number and position of the adjusting devices (adjusting levers  10 ) are selected in such a way that all of the gas exchange valves ( 1 ) have substantially the same stroke adjustment in relation to one another.  
   
   
       2 . A variable mechanical valve timing mechanism of  claim 1 , wherein a plurality of adjusting devices (adjusting levers  10 ) are provided along an adjusting shaft ( 6 ), preferably uniformly distributed.  
   
   
       3 . A variable mechanical valve timing mechanism of  claim 1 , wherein the adjusting shaft ( 6 ) is subdivided into a plurality of sectional shafts ( 12 ), and each sectional shaft ( 12 ) is assigned an adjusting device (adjusting lever  10 ).  
   
   
       4 . A variable mechanical valve timing mechanism of  claim 1 , wherein the adjusting device (adjusting lever  10 ) is arranged centrally on the adjusting shaft ( 6 ) or the sectional shafts ( 12 ).  
   
   
       5 . A variable mechanical valve timing mechanism of  claim 1 , wherein, starting from the adjusting device or devices (adjusting lever  10 ), the section modulus is varied along the adjusting shaft ( 6 ) or sectional shafts ( 12 ) in such a way that all the adjusting elements ( 7 ) have substantially the same adjusting angle.  
   
   
       6 . A variable mechanical valve timing mechanism of  claim 1 , wherein the adjusting cams ( 9 ) of the adjusting elements ( 7 ) and/or the angular positions of the adjusting elements ( 7 ) on the adjusting shaft ( 6 ) or sectional shafts ( 12 ) are modified in order to attain an identical stroke adjustment of the gas exchange valves ( 1 ) in relation to one another.