What is the main purpose of piston rings?

[LeHope]

Piston rings are primarily used to seal the combustible gas mixture in the combustion chamber and scrape off excess oil from the cylinder walls. The main functions of piston rings are: 1. Sealing function: Piston rings maintain the seal between the piston and cylinder wall, minimizing gas leakage; 2. Heat conduction function: They transfer and distribute the high heat generated by combustion to the cylinder walls, helping to cool the piston; 3. Oil control function: They scrape off lubricating oil adhering to the cylinder walls and maintain normal oil consumption; 4. Support function: As piston rings move up and down in the cylinder, they prevent direct contact between the piston and cylinder, providing support.