Piston for an internal combustion engine and method for its production

Abstract

The present invention relates to a piston ( 10, 110, 210 ) for an internal combustion engine, having a piston base body ( 11, 111, 211 ) and a piston ring element ( 12, 112, 212 ), whereby the piston base body ( 11, 111, 211 ) has at least an inner region ( 14 ) of a piston crown ( 13 ) as well as a piston skirt ( 16 ), which is provided with pin bosses ( 18 ) having pin bores ( 17 ), whereby the piston ring element ( 12, 112, 212 ) has at least an outer region ( 21 ) of a piston crown ( 13 ) having a circumferential top land ( 22 ), and a circumferential ring belt ( 23 ) provided with ring grooves ( 24 ). According to the invention, it is provided that piston base body ( 11, 111, 211 ) and piston ring element ( 12, 112, 212 ) are joined together by way of corresponding, conical joining surfaces ( 32, 33, 27, 28; 135, 136; 232, 233, 227, 228 ) configured on them. The present invention furthermore relates to a method for the production of such a piston.

1 . Piston ( 10 ,  110 ,  210 ) for an internal combustion engine, having a piston base body ( 11 ,  111 ,  211 ) and a piston ring element ( 12 ,  112 ,  212 ), whereby the piston base body ( 11 ,  111 ,  211 ) has at least an inner region ( 14 ) of a piston crown ( 13 ) as well as a piston skirt ( 16 ), which is provided with pin bosses ( 18 ) having pin bores ( 17 ), whereby the piston ring element ( 12 ,  112 ,  212 ) has at least an outer region ( 21 ) of a piston crown ( 13 ) having a circumferential top land ( 22 ), and a circumferential ring belt ( 23 ) provided with ring grooves ( 24 ), wherein piston base body ( 11 ,  111 ,  211 ) and piston ring element ( 12 ,  112 ,  212 ) are joined together by way of corresponding, conical joining surfaces ( 32 ,  33 ,  27 ,  28 ;  135 ,  136 ;  232 ,  233 ,  227 ,  228 ) configured on them. 
     
     
         2 . Piston according to  claim 1 , wherein the corresponding joining surfaces ( 32 ,  33 ,  27 ,  28 ;  135 ,  136 ;  232 ,  233 ,  227 ,  228 ) have different cone angles, as a whole or in certain regions, and/or the resulting gap is filled with a joining material. 
     
     
         3 . Piston according to  claim 1 , wherein a circumferential cooling channel is provided in the piston ring element ( 112 ). 
     
     
         4 . Piston according to  claim 1 , wherein piston base body ( 11 ,  211 ) and piston ring element ( 12 ,  212 ) jointly form a circumferential cooling channel ( 34 ,  234 ). 
     
     
         5 . Piston according to wherein the piston base body ( 211 ) and/or the piston ring element ( 212 ) has/have a locally thickened part ( 237 ,  238 ) in the region of the ends of the joining surfaces ( 232 ,  233 ,  227 ,  228 ) on the cooling channel side. 
     
     
         6 . Piston according to  claim 1 , wherein the piston crown ( 13 ) has a combustion chamber bowl ( 15 ). 
     
     
         7 . Piston according to  claim 6 , wherein the combustion chamber bowl ( 15 ) has a bowl edge ( 25 ) composed of a wear-resistant and/or temperature-resistant material. 
     
     
         8 . Piston according to  claim 1 , wherein the piston base body ( 11 ,  111 ,  211 ) is produced from a metallic material, and the piston ring element ( 12 ,  112 ,  212 ) is produced from a wear-resistant and/or temperature-resistant material. 
     
     
         9 . Method for the production of a piston ( 10 ,  110 ,  210 ) for an internal combustion engine, having a piston base body ( 11 ,  111 ,  211 ) and a piston ring element ( 12 ,  112 ,  212 ), whereby the piston base body ( 11 ,  111 ,  211 ) has at least an inner region ( 14 ) of a piston crown ( 13 ) as well as a piston skirt ( 16 ), which is provided with pin bosses ( 18 ) having pin bores ( 17 ), whereby the piston ring element ( 12 ,  112 ,  212 ) has at least an outer region ( 21 ) of a piston crown ( 13 ) having a circumferential top land ( 22 ), and a circumferential ring belt ( 23 ) provided with ring grooves ( 24 ), wherein piston base body ( 11 ,  111 ,  211 ) and piston ring element ( 12 ,  112 ,  212 ) are joined together by way of corresponding, conical joining surfaces ( 32 ,  33 ,  27 ,  28 ;  135 ,  136 ;  232 ,  233 ,  227 ,  228 ) configured on them. 
     
     
         10 . Method according to  claim 9 , wherein the corresponding joining surfaces ( 32 ,  33 ,  27 ,  28 ;  135 ,  136 ;.  232 ,  233 ,  227 ,  228 ) have different cone angles, as a whole or in certain regions, and/or the resulting gap is filled with a joining material. 
     
     
         11 . Method according to  claim 9 , wherein the piston base body ( 11 ,  111 ,  211 ) and the piston ring element ( 12 ,  112 ,  212 ) are joined together by means of gluing, welding, or soldering. 
     
     
         12 . Method according to  claim 9 , wherein the piston ring element ( 12 ,  112 ,  212 ) and/or the piston base body ( 11 ,  111 ,  211 ) has/have an axial bracing force applied to it/them during the joining process.