Patent ID: 8863719

Claim:
Pin bosses ( 1 ) of a piston ( 2 ) for an internal combustion engine, each pin boss having a pin bore ( 3 ) with bore axis ( 13 ), for mounting a piston pin ( 14 ), the pin bore having an inner region extending toward an inside surface of the pin boss and an outer region extending toward an outside surface of the pin boss, wherein the inner regions ( 16 ) of the pin bores ( 3 ), seen in the direction of the bore axis ( 13 ), have regions ( 11 , 12 ) on both sides of the zenith ( 4 ), which have a greater distance from the bore axis ( 13 ) than the zenith ( 4 ) and an equator that lies between the zenith and a nadir of the pin bore ( 3 ), the zenith ( 4 ) of the pin bore ( 3 ) has a lesser distance from the bore axis ( 13 ) in the inner region ( 16 ) of the pin bores ( 3 ) than the nadir ( 5 ) of the pin bores ( 3 ) in said inner region, the outer regions ( 17 ) of the pin bores ( 3 ), seen in the direction of the bore axis ( 13 ), are configured to be longer in a horizontal direction than in a vertical direction, with regard to the vertical piston axis ( 7 ), the inner regions ( 16 ) of the pin bores ( 3 ) make a constant transition into the outer regions ( 17 ) of the pin bores ( 3 ) and the nadir ( 5 ) of the inner regions ( 16 ) of the pin bores ( 3 ), seen in the direction of the bore axis ( 13 ), is configured to be longitudinally oval in the direction of the piston axis ( 7 ).