Method for linking elements to hollow shafts, preferably for producing camshafts, and resulting camshaft

Abstract

A method for the linking of components to hollow shafts, preferably for producing camshafts, is disclosed where the components, especially cam rings, are manufactured so as to generate their function-related contour, that either a hardenable material is used for this purpose which, aside from its elastic deformability, after hardening still has a permissible plastic deformability of minor extent; or that subsequently the surface of the components, particularly the contact face of the cams, is subjected to a surface-hardening process. These components together with the hollow shaft to be deformed are placed into an IHPF tool in a manner to suit the respective function, and that in a second process step through the application of the IHPF process and due to the internal pressure exerted the components are joined to the hollow shaft in a force- and form-closing manner.

1 . A method for the linking of components to hollow shafts, preferably for producing camshafts, characterized in that in a first process step the components, especially cam rings, are manufactured so as to generate their function-related contour, that a hardenable material is used for this purpose which, aside from its elastic deformability, after hardening still has a permissible plastic deformability of minor extent, that these components together with the hollow shaft to be deformed are placed into an IHPF tool in a manner to suit the respective function, and that in a second process step through the application of the IHPF process and due to the internal pressure exerted the components are joined to the hollow shaft in a force- and form-closing manner.  
   
   
       2 . A method for the linking of components to hollow shafts, preferably for producing camshafts, characterized in that in a first process step the components, especially cam rings, are manufactured so as to generate their function-related contour, that subsequently the surface of the components, particularly the contact face of the cams, is subjected to a surface-hardening process, that these components together with the hollow shaft to be deformed are placed into an IHPF tool in a manner to suit the respective function, and that in a second process step through the application of an IHPF process and due to the internal pressure exerted the components are joined to the hollow shaft in a force- and form-closing manner.  
   
   
       3 . The method for the joining of components to a hollow shaft according to  claim 1 , characterized in that the first process step of  claim 1  is combined with a process step where the components, especially cam rings, are manufactured so as to generate their function-related contour, that subsequently the surface of the components, particularly the contact face of the cams, is subjected to a surface-hardening process, that these components together with the hollow shaft to be deformed are placed into an IHPF tool in a manner to suit the respective function, and the second process step being carried out thereafter.  
   
   
       4 . The method according to  claim 1 , characterized in that through the selection of the material the cam ring and the subsequent hardening and/or the surface hardening shows/enables a permissible residual expansion of >=0.5% to be attained.  
   
   
       5 . The method according to  2 , characterized in that through the selection of the material the cam ring and the subsequent hardening and/or the surface hardening shows/enables a permissible residual expansion of >=0.5% to be attained.  
   
   
       6 . The method according to  3 , characterized in that through the selection of the material the cam ring and the subsequent hardening and/or the surface hardening shows/enables a permissible residual expansion of >=0.5% to be attained.  
   
   
       7 . A camshaft manufactured according to the method of linking of cam rings to hollow shafts in that in a first process step, the-cam rings are manufactured, so as to generate their function-related contour, from two individual rings of different material connected to each other in a force- and form-closing manner, with the material of the outer ring being hard and elastic and having a permissible residual expansion of at least 0.5%, and that of the inner ring being soft and plastically deformable, the cam rings together with the hollow shaft to be deformed are placed into an IHPF tool in a manner to suit the respective function, and wherein in a second process step through the application of an IHPF process and, due to the internal pressure exerted the cam rings are joined to the hollow shaft in a force- and form-closing manner, 
 wherein cam rings made with appropriate contours in a separate process, are mounted onto a hollow shaft by an IHPF process in a force- and form-closing manner, the cam rings consisting of two rings joined with each other in a force- and form-closing manner with the inner ring being made of soft, plastically deformable material and the outer ring being made of a hard, elastic material, characterized in that when the manufacturing process is completed, the cam rings are hardened in their function-related form; or consist of two rings joined with each other in a force- and form-closing manner.    
   
   
       8 . The camshaft of  claim 7 , wherein hardening of the cam shaft is surface-hardened;  
   
   
       9 . The camshaft according to  claim 4 , characterized in that the components are gearwheels, sprockets or similar force-transmitting functional elements that possess over a defined thickness from the root circle towards the inside the elastically deformable layer.  
   
   
       10 . A camshaft according to  claim 5 , characterized in that the components are gearwheels, sprockets or similar force-transmitting functional elements that possess over a defined thickness from the root circle towards the inside the elastically deformable layer.  
   
   
       11 . A camshaft according to  claim 6 , characterized in that the components are gearwheels, sprockets or similar force-transmitting functional elements that possess over a defined thickness from the root circle towards the inside the elastically deformable layer.