Camshaft adjuster for an internal combustion engine

Abstract

In a camshaft adjuster for an internal combustion engine, having a hydraulic control piston for controlling an adjusting unit for the angular adjustment of a camshaft relative to a crankshaft, the control piston is supported in a separate guide sleeve received in an opening in the camshaft by a press-fit.

1 . A camshaft adjuster for an internal combustion engine, having a hydraulic valve with a control piston ( 10 ) for controlling an adjusting unit for the angular adjustment of the camshaft ( 16 ), said control piston ( 10 ) being supported in a separate guide sleeve, said guide sleeve ( 11 ) being pressed into a cylindrical axial opening of said camshaft ( 16 ).  
   
   
       2 . A camshaft adjuster as claimed in  claim 1 , wherein the guide sleeve ( 11 ) has control edges which are formed by openings ( 12 ,  13 ,  14 ,  15 ) in the guide sleeve ( 11 ).  
   
   
       3 . A camshaft adjuster as claimed in  claim 1 , wherein at least one channel ( 47 ,  48 ,  53 ) is formed in the guide sleeve ( 11 ) at at at least one interface ( 17 ,  54 ,  55 ,  56 ) between the guide sleeve ( 11 ) and the camshaft ( 16 ).  
   
   
       4 . A camshaft adjuster as claimed in  claim 1 , wherein the control piston ( 10 ) is held captively in the guide sleeve ( 11 ) via a securing element ( 18 ).  
   
   
       5 . A camshaft adjuster as claimed in  claim 4 , wherein a spring ( 19 ) which acts on the control piston ( 10 ) is arranged in the guide sleeve ( 11 ).  
   
   
       6 . A camshaft adjuster as claimed in  claim 5 , wherein the position of the control piston ( 10 ) is determined by the equilibrium of forces between the force of the spring ( 19 ) and the counteracting magnetic force.  
   
   
       7 . The camshaft adjuster as claimed in  claim 1 , wherein the guide sleeve ( 11 ) is held by means of a press joint produced by a thermal shrinking process.