Patent ID: 8661965
Filing Date: 2014-03-04
Classification: F02F

Abstract:
1. Piston ( 10 , 110 , 210 , 310 ) for an internal combustion engine, having a first piston component ( 11 ) and a second piston component ( 12 ), which are connected with one another by a friction welding method, and which jointly form a circumferential cooling channel ( 23 ) that is open toward the second piston component ( 12 ), whereby the first piston component ( 11 ) forms at least a part of a piston crown ( 13 ) as well as an outer circumferential wall ( 34 ) of the cooling channel ( 23 ), wherein the piston ( 10 , 110 , 210 , 310 ) has a combustion chamber bowl ( 16 ), wherein the first piston component ( 11 ) forms a wall ( 16 ′) of the combustion chamber bowl ( 16 ), which makes a transition into the piston crown ( 13 ), wherein the second piston component ( 12 ) forms a crown region ( 16 ″) of the combustion chamber bowl ( 16 ), wherein a joining seam ( 27 ) formed by means of said friction welding method is disposed in a region of the combustion chamber bowl ( 16 ), wherein the outer circumferential wall ( 34 ) of the cooling channel ( 23 ) has a circumferential projection ( 32 ) below the piston crown ( 13 ), said projection ( 32 ) being provided with a circumferential guide surface ( 33 ) for coolant, directed radially inward, said projection ( 32 ) being disposed opposite from said joining seam ( 27 ) within the circumferential cooling channel ( 23 ), and said projection ( 32 ) being disposed above said joining seam ( 27 ) in a cylinder axis direction.