Camshaft adjuster for an internal combustion engine

Abstract

The invention relates to a camshaft adjuster for an internal combustion engine. In camshaft adjusters, spring elements which influence the moment conditions for the positional definition and influencing of the camshaft adjuster are usually arranged so as to lie on the inside of the housing. According to the invention, a spring element ( 29 ) is arranged outside the housing ( 4 ) in a camshaft adjuster ( 1 ), a spring base point of the spring element ( 29 ) being supported via a pin ( 21 ) which penetrates the housing ( 4 ) and is connected fixedly in terms of rotation to a rotor ( 6 ).

1 . Camshaft adjuster ( 1 ) for an internal combustion engine, comprising:
 a) a driven housing,   b) an output element which can be connected fixedly in terms of rotation to the camshaft and can be rotated relative to the housing for an adjusting movement of the camshaft adjuster, and   c) a spring element which acts between the driven housing and the output element, wherein the spring element is arranged outside the housing.   
   
   
       2 . Camshaft adjuster according to  claim 1 , wherein a spring base point is supported on a supporting element which
 a) is connected fixedly in terms of rotation to the output element which is arranged in the housing, and   b) penetrates a cut-out of a wall of the housing, a relative movement between the housing and the supporting element being made possible.   
   
   
       3 . Camshaft adjuster according to  claim 2 , wherein the supporting element is supported with respect to an output element which is configured as a rotor of the camshaft adjuster in the vane cell design. 
   
   
       4 . Camshaft adjuster according to  claim 3 , wherein the supporting element is configured as a pin. 
   
   
       5 . Camshaft adjuster according to  claim 4 , wherein the pin is connected to the rotor via a press joint fit. 
   
   
       6 . Camshaft adjuster according to  claim 2 , wherein the wall of the housing has a cut-out which extends in the circumferential direction and through which the supporting element passes, making a relative rotation possible. 
   
   
       7 . Camshaft adjuster according to  claim 3 , wherein a seal is provided between the rotor and the housing in the surrounding region of the cut-out. 
   
   
       8 . Camshaft adjuster according to  claim 1 , wherein the spring element is configured with a helical torsion spring. 
   
   
       9 . Camshaft adjuster according to  claim 1 , wherein the spring element is arranged on that side of the camshaft adjuster which faces a cylinder head. 
   
   
       10 . Camshaft adjuster according to  claim 1 , wherein the spring element is arranged radially on the inside of the drive element or drive gear of the camshaft adjuster. 
   
   
       11 . Camshaft adjuster according to  claim 1 , wherein a drive element of the camshaft adjuster has a central bore or annular groove, in which the spring element is received. 
   
   
       12 . Camshaft adjuster according to  claim 1 , wherein the spring element is arranged in the axial direction between the housing and a covering. 
   
   
       13 . Camshaft adjuster according to  claim 1 , wherein the spring element has at least one hook-shaped spring base point which is hooked into the output element, the supporting element and/or the housing or a component which is connected fixedly in terms of rotation to a component of this type. 
   
   
       14 . Camshaft adjuster according to  claim 13 , wherein the spring element is supported on a stop in the radial direction in the surrounding region of a spring base point, in which radial direction the hooking of the spring base point into the output element, the supporting element or the housing is released.