A PISTON ARRANGEMENT FOR A CLEAN COMBUSTION ENGINE

The present invention relates to a piston arrangement (1) for a clean combustion engine (100), such as a hydrogen engine. The piston arrangement comprises - a piston (10) configured for reciprocal movement inside a cylinder (50) having a cylinder wall (52), the piston having a piston head (12) configured to face a first compartment (70) with pressurized gas, - a sealing arrangement (20) comprising at least one sealing ring (22) configured to be arranged to seal the piston to the cylinder wall and separating the first compartment from a second compartment (72), and - a water channel (14) extending from an interior of the piston to the sealing ring to provide water for lubricating the sealing ring. [0002] The piston head comprises a pumping element (30) configured to be arranged to pressurize the water in the water channel by pressurised gas in the first compartment.