Internal combustion engine and camshaft thereof

Abstract

Cams are formed on a camshaft that correspond to intake valves so that intake flow of an internal combustion engine may be improved. The cams each have a cam lobe and the lobes of different cams are formed in different shapes.

1 . A camshaft structure for an internal combustion engine, comprising: 
 a plurality of cams including a first and a second cam to respectively drive a first and a second intake valve arranged for a cylinder, wherein first and second cam lobes of said first and said second cams are formed in different shapes.    
   
   
       2 . The camshaft structure according to  claim 1 , wherein said first and second cam lobes are offset from each other on their principal axes by their offset angle settings.  
   
   
       3 . The camshaft structure according to  claim 2 , wherein said offset angle is less than about 60 degrees.  
   
   
       4 . An internal combustion engine, comprises: 
 at least one cylinder;    at least a first and a second intake valve arranged for said one cylinder; and    a camshaft provided with a plurality of cams that include a first and a second cam to respectively drive the first and the second intake valves, wherein first and second cam lobes of said first and second cams are formed in different shapes.    
   
   
       5 . The internal combustion engine according to  claim 4 , wherein said first and second cam lobes are offset from each other on their principal axes with their offset angle settings.  
   
   
       6 . The internal combustion engine according to  claim 5 , wherein said offset angle is less than about 60 degrees.  
   
   
       7 . A camshaft for an internal combustion engine, comprising: 
 a generally linear shaft having a length and a width; and    at least two intake cams coupled with said generally linear shaft, said at least two intake cams configured and dimensioned to operate independent intake valves of a particular cylinder, wherein said at least two intake cams include cam lobes and said cam lobes are of different shapes from each other.    
   
   
       8 . The camshaft of  claim 7 , wherein said different shape is an offset of rotation about a longitudinal axis of said generally linear shaft.  
   
   
       9 . The camshaft of  claim 8 , wherein said offset is about 60 degrees or less.  
   
   
       10 . The camshaft of  claim 7 , further comprising a plurality of intake cams configured and dimensioned to operate a plurality of independent intake valves of the particular cylinder.