Joined multiple cam comprising individual prefabricated cams

Abstract

A joined prefabricated individual cam ( 1, 2 ), comprising multiple cams for an adjustable camshaft in particular for an internal combustion engine of a motor vehicle, whereby the camshaft has two shafts mounted concentrically one inside the other, namely an inner shaft and an outer shaft, and the joined multiple cam is fixedly pinned to the inner shaft via radial openings provided in the outer shaft with a rotatable bearing on the outer shaft, should be easy and inexpensive to manufacture. To this end, such a multiple cam is characterized in that at least one prefabricated individual cam ( 1, 2 ) is placed as a cam ring on the outside circumference of a carrier pipe ( 3 ″) at an axial distance from the neighboring individual cams ( 1, 2 ) and is fixedly connected to this carrier pipe ( 3 ″) at a predetermined angle of rotation and axial distance assignment.

1 . A joined prefabricated individual cam comprising multiple cams for an adjustable camshaft in particular for an internal combustion engine of a motor vehicle, whereby the camshaft has two shafts mounted concentrically one inside the other, namely an inner shaft and an outer shaft, and the joined multiple cam is fixedly pinned to the inner shaft through radial openings provided in the outer shaft with a rotatable bearing on the outer shaft, 
 wherein    at least one prefabricated individual cam ( 1 ,  2 ) is placed as a cam ring on the outside circumference of a carrier pipe ( 3 ) at an axial distance from a neighboring individual cam ( 1 ,  2 ) and is fixedly connected to this carrier pipe ( 3 ) in a predetermined angle of rotation and axial distance assignment.    
   
   
       2 . The joined multiple cam according to  claim 1 , 
 wherein    the at least one individual cam ( 1 ,  2 ) is placed on a circular cylindrical circumferential area of the carrier pipe ( 3 ).    
   
   
       3 . The joined multiple cam according to  claim 1 , 
 wherein    the carrier pipe ( 3 ) is designed and manufactured in one piece with the individual cam ( 1 ,  2 ).    
   
   
       4 . The joined multiple cam according to  claim 1 , 
 wherein    an axial distance between two individual cams ( 1 ,  2 ) is defined by a ring collar ( 5 ) provided axially on the carrier pipe ( 3 ).    
   
   
       5 . The joined multiple cam for an adjustable camshaft according to  claim 1 , 
 wherein    the carrier pipe ( 3 ) has at least one radial opening for pinning the multiple cam to an inner shaft of the adjustable camshaft, said radial opening being situated outside of the circumferential areas taken up by the individual cams ( 1 ,  2 ).    
   
   
       6 . The joined multiple cam according to  claim 1 , 
 wherein    the axial distances between the individual cams ( 1 ,  2 ) are maintained by spacer rings ( 8 ) placed on the carrier pipe.    
   
   
       7 . The joined multiple cam according to  claim 1 , 
 wherein    pins ( 4 ) that can be inserted into the carrier pipe ( 3 ) to pin it to the inner shaft of an adjustable camshaft exert axial and/or rotational angle fixation functions simultaneously for at least one of the individual cams ( 1 ,  2 ) in the inserted state.    
   
   
       8 . The joined multiple cam according to  claim 1 , 
 wherein    the ring collar ( 5 ) of the carrier pipe ( 3 ) is an area created on the carrier pipe ( 3 ) by an internal high-pressure shaping process.    
   
   
       9 . The joined multiple cam according to  claim 1 , 
 wherein    the carrier pipe ( 3 ) has a larger inside diameter in comparison with axially neighboring areas in its at least one pinned area.    
   
   
       10 . The joined multiple cam according to  claim 1 , 
 wherein    two neighboring individual cams ( 1 ,  2 ) each have an integrally molded partial piece of the carrier pipe ( 3 ), whereby these partial pieces are telescoped into one another when the individual cams ( 1 ,  2 ) are joined.    
   
   
       11 . The joined multiple cam according to  claim 1 , 
 wherein    at least one part of the individual elements is joined together by at least one or a combination of several of the following types of joining, namely a press fit, a weld, a glued joint, a soldered joint or a form-fitting connection.