Patent ID: 7278390

Claim:
Pin boss ( 18 ) of a piston ( 6 ) for an internal combustion engine, having a pin bore ( 1 ) for accommodating a piston pin, which has an inside surface ( 2 ) having a non-profile-bored region ( 17 ), having an oil circulation groove ( 4 , 29 ) and a transverse groove ( 5 , 24 , 26 ), which are disposed in the non-profile-bored region ( 17 ) of the inside surface ( 2 ), whereby the transverse groove ( 5 , 24 , 26 ) lies at least approximately parallel to the longitudinal axis ( 3 ) of the pin bore ( 1 ) and has an outflow opening ( 14 , 28 ) for draining off cooling oil, on the outside of the piston, and whereby the oil circulation groove ( 4 , 29 ) is disposed circular to the longitudinal axis ( 3 ) and crosses the transverse groove ( 5 , 24 , 26 ), and having an oil supply bore ( 9 ) that opens into the oil circulation groove ( 4 , 29 ), which bore is connected with an oil inflow opening ( 13 ) disposed on the outside of the piston, by way of an oil inflow ( 10 ).