Patent ID: 7380536

Claim:
Combustion bowl ( 4 , 4 ′, 12 , 16 , 18 - 22 ) in the crown ( 1 , 13 ) of a piston ( 2 , 2 ′, 14 ) for a diesel engine, having a ring-shaped cooling channel ( 9 ) disposed in the radially outer edge region of the piston ( 2 , 2 ′, 14 ) on the piston crown side, whereby the combustion bowl ( 4 , 12 , 16 , 18 - 22 ) as well as its bowl neck ( 5 , 11 , 26 ) are disposed outside of the center relative to the longitudinal piston axis ( 3 ), wherein an undercut ( 8 , 8 ′, 38 ), which extends radially outward and non-uniformly relative to the bowl neck ( 5 , 11 , 26 ) toward the cooling channel ( 9 ), is formed into at least a part of the radially outer edge region of the combustion bowl ( 4 , 12 , 16 , 18 - 22 ), to such an extent that the entire radially outer edge region of the combustion bowl ( 4 , 12 , 16 , 18 - 22 ) is disposed sufficiently close to the cooling channel ( 9 ) for a cooling effect of the cooling channel ( 9 ) on the combustion bowl ( 4 , 12 , 16 , 18 - 22 ).