Together with the cylinder head and cylinder wall, it forms the combustion chamber. It withstands the pressure of the gas in the cylinder and transmits this force to the connecting rod through the piston pin, thereby pushing the crankshaft to rotate and causing the engine to output power. The top of the piston is usually designed according to different combustion chamber forms. For example, gasoline engines often use flat-top pistons, while diesel engines may have pits on the top of the piston to adapt to the requirements for mixture formation and combustion. The piston ring is installed in the piston ring groove and is used to seal the gap between the piston and the cylinder wall to prevent high-temperature and high-pressure gas from escaping into the crankcase, and to prevent engine oil from escaping into the combustion chamber. The piston head is the installation location of the piston rings, which is responsible for transferring the heat absorbed by the top of the piston to the cylinder and dissipating it through the cooling medium. The piston skirt serves as a guide to allow the piston to move smoothly in the cylinder.
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