Piston of an internal combustion engine

A piston of an internal combustion engine, comprising:

• a piston upper part;
• a piston lower part connected to the piston upper part;
• a piston pin, which is mounted in the piston lower part and configured to connect the piston to a connecting rod of the internal combustion engine;
• at least one transfer bore
• a first cooling space formed between the piston upper part and the piston lower part for cooling oil for cooling the piston;
• a second cooling space, formed between the piston upper part and the piston lower part, connected to the first cooling space via the at least one transfer bore;
• a cooling oil conduction sleeve, configured to conduct cooling oil, conducted through a bore in the connecting rod, towards the first cooling space, wherein a guiding surface of the cooling oil conduction sleeve adjoins a support face of the piston lower part;
• and
• at least one groove circulating in a circumferential direction introduced into the guiding surface of the cooling oil conduction sleeve and/or into the support face of the piston lower part;
• and
• at least two recesses, which extend in a radial direction and penetrate the cooling oil conduction sleeve, introduced into the cooling oil conduction sleeve and configured to feed lubricating oil to a region between the cooling oil conduction sleeve and the piston lower part.