Patent ID: 8794208

Claim:
Piston ( 10 ) for an internal combustion engine, having a piston head ( 11 ) and a piston skirt ( 15 ) delimited by a lower skirt edge ( 18 ), wherein the piston skirt ( 15 ) has a working surface ( 16 ) assigned to its major thrust side (DS) and a working surface ( 17 ) assigned to its minor thrust side (GDS), and wherein a first zone ( 21 ) is assigned to the working surface ( 16 ) of the major thrust side (DS) and surrounded by a region ( 22 ) exposed to greater stress during operation of the internal combustion engine than the first zone ( 21 ), and wherein a second zone ( 21 ′) is assigned to the working surface ( 17 ) of the minor thrust side (GDS) and surrounded by a region ( 22 ′) exposed to greater stress during operation of the internal combustion engine than the second zone ( 21 ′), wherein the first and second zones ( 21 , 21 ′) proceed from the lower skirt edge ( 18 ), wherein the zone ( 21 ) of the working surface ( 16 ) assigned to the major thrust side (DS) and/or the zone ( 21 ′) of the working surface assigned to the minor thrust side (GDS) is provided with a coating ( 23 , 23 ′) that has grooves ( 24 , 24 ′) that run vertically proceeding from the lower skirt edge ( 18 ) in such a manner that, during operation of the internal combustion engine, lubricant oil penetrates into the grooves ( 24 , 24 ′) and the regions ( 22 , 22 ′) experience additional lubrication.