Pistons and piston assemblies for internal combustion engines

A piston assembly for an internal combustion engine, the piston assembly comprising:

• a piston that is movable along a cylinder bore of the internal combustion engine, the piston including an upper portion and a lower portion, the upper portion of the piston including a crown facing the cylinder bore;
• and
• a piston pin extending along a longitudinal axis transversely to the piston, the piston pin being coupled to the piston below the crown, wherein the piston pin includes an outer surface extending around the longitudinal axis, the outer surface having a non-circular shape so that gaps for receiving fluid are created between the piston pin and the upper portion of the piston in response to the piston moving longitudinally in the cylinder bore.

A piston cooling arrangement for an internal combustion engine, the piston cooling arrangement comprising:

• a piston configured to reciprocally move in a cylinder bore of the internal combustion engine, the piston including:
• at least one inlet port for fluid and at least one outlet port for fluid, wherein the at least one inlet port is configured to direct fluid flowing into the piston from a first trajectory to a second trajectory.