Method of producing assembled camshafts

Abstract

A method of producing assembled camshafts from a tubular member and components slid on to same and having through-holes and outer functional faces, wherein the components are provided with through-holes which have been machined by non-chip-forming operations and on which an outer contour is preferably finish-machined; wherein the tubular member can be clamped in so as to be centred on a reference axis B; wherein the components are slid on and are centred via their outer contour on the reference axis of the clamping means of the tubular member; wherein, between the through-holes and the tubular member, a compensating and joining gap is provided and wherein; between the components and the tubular member with material being added, a material locking connection or a press fit connection is provided by expanding the tubular member.

1 . A method of producing assembled camshafts comprising providing a tubular member ( 21 ) and components slid on to same and each having a through-hole ( 33 ,  37 ) and an outer functional face ( 32 ,  36 ), said components selected from the group of at least one cam disc ( 31 ) and at least one bearing ring ( 35 ); wherein, the tubular member ( 21 ) is clamped in so as to be centred on a reference axis (B); wherein the components ( 31 ,  35 ) are slid on to the tubular member ( 21 ) by means of their through-hole ( 33 ,  37 ) and are centred via their outer contour (K 31 , K 35 ) on the reference axis (B) of the tubular member ( 21 ); wherein a joining gap ( 34 ,  38 ) is provided between the through-holes ( 33 ,  37 ) and the tubular member ( 21 ); and a material locking connection is provided between the components ( 31 ,  35 ) and the tubular member ( 21 ). 
   
   
       2 . A method according to  claim 1 , further comprising adding material to provide a material locking connection between the components ( 31 ,  35 ) and the tubular member ( 21 ). 
   
   
       3 . A method according to  claim 1 , further comprising providing the material locking connection produced in the form of an annulus at each of the axial end faces ( 29 ,  30 ;  49 ,  50 ) of the components ( 31 ,  35 ). 
   
   
       4 . A method of producing assembled camshafts from a tubular member ( 21 ) and components slid on to same and having a through-hole ( 33 ,  37 ) and an outer functional face ( 32 ,  36 ) said components selected from the group of at least one cam disc ( 31 ) and at least one bearing ring ( 35 ); wherein the tubular member ( 21 ) is clamped in so as to be centred on a reference axis (B); wherein the components ( 31 ,  35 ) are slid on to the tubular member ( 21 ) by means of their through-hole ( 33 ,  37 ) and are centred via their outer contour (K 31 , K 35 ) on the reference axis (B) of the tubular member ( 21 ); wherein a joining gap ( 34 ,  38 ) is provided between the through-holes ( 33 ,  37 ) and the tubular member ( 21 ); and thereafter, between the components ( 31 ,  35 ) and the tubular member ( 21 ), a press fit connection is provided by plastically expanding the tubular member ( 21 ). 
   
   
       5 . A method according to  claim 4 , wherein the tubular member ( 21 ) is expanded only in longitudinal portions associated with the components ( 31 ,  35 ). 
   
   
       6 . A method according to  claim 4 , wherein a form fitting connection is simultaneously produced between the components ( 31 ,  35 ) and the tubular member ( 21 ) in the region of the press fit connections. 
   
   
       7 . A method according to  claim 1 , wherein the components ( 31 ,  35 ) are provided so as to comprise through-holes ( 33 ,  37 ) produced by a non-chip forming operation. 
   
   
       8 . A method according to  claim 1 , wherein the components ( 31 ,  35 ) have functional faces ( 32 ,  36 ) which are machine-finished. 
   
   
       9 . A method according to  claim 1 , wherein the tubular member ( 21 ) has a portion of its outer face produced by a non-chip forming operation at least in the region of the components ( 31 ,  35 ), wherein said tubular member ( 21 ) is clamped in via its inner face ( 23 ) so as to be centred on its inner axis (A Zentren) and wherein said inner axis (A Zentren) forms the reference axis (B). 
   
   
       10 . A method according to  claim 1 , further comprising providing the tubular member ( 21 ) with an outer face receiving a chip-forming operation at least in the region of bearing places ( 24 ) on the outer face and a grounding operation; and wherein the tubular member ( 21 ) is clamped in via the bearing places ( 24 ) so as to be centred on its bearing axis (A Lager) and that the bearing axis (A Lager) forms the reference axis (B). 
   
   
       11 . A method according to  claim 1 , further comprising providing the components ( 31 ,  35 ) with punched-out through-holes ( 33 ,  37 ). 
   
   
       12 . A method according to  claim 1 , further comprising forming the components ( 31 ,  35 ) of materials selected from the group of sintered material and cast material with formed through-holes ( 33 ,  37 ). 
   
   
       13 . A method according to  claim 1 , further comprising providing a joining gap ( 34 ,  38 ) based on a diameter difference of at least 0.2 mm between the through-hole diameter of the components ( 31 ,  35 ) and the outer diameter of the tubular member ( 21 ) in the joining region. 
   
   
       14 . A method according to  claim 1 , further comprising forming a material locking connection from a connecting process selected from the group of laser soldering, laser welding and gluing. 
   
   
       15 . A method according to  claim 14 , wherein the group comprises the laser soldering and laser welding operation, and wherein the tempering temperature of the respective material is not exceeded by the connecting process in the functional faces ( 32 ,  36 ) of the components ( 31 ,  35 ). 
   
   
       16 . A method according to  claim 4 , wherein the plastically expanding step comprises hydraulic internal high pressure forming. 
   
   
       17 . A method according to  claim 1 , further comprising machine-finishing the functional faces ( 32 ,  36 ) of the components ( 31 ,  25 ) after the providing of the material locking connection. 
   
   
       18 . A method according to  claim 17 , wherein the machine-finishing is selected from the group of grinding and surface finishing.