What is the role of the piston ring

The role of the piston ring is very important, there are four main aspects:

1. Sealing: The piston ring can seal the gas, prevent the gas from the combustion chamber from leaking to the crankcase, control the gas leakage to a minimum, and improve the thermal efficiency of the engine. Air leakage will not only cause the power of the engine to drop, but also affect the quality of the oil. The gas ring is the main component to achieve this function.

2. Oil control: The piston ring can adjust the oil, scrape the excess lubricating oil from the cylinder wall, and form a thin oil film on the cylinder wall to ensure the normal lubrication of the piston, piston ring and cylinder. The oil ring is the main component to achieve this function. Modern high-speed engines pay special attention to the role of piston ring control oil film.

3. Thermal conductivity: The piston ring can conduct the heat of the piston to the cylinder liner for cooling. According to statistics, 70% to 80% of the heat at the top of the piston is transferred to the cylinder wall through the piston ring and dissipated.

4. Support: The piston ring can support the piston, keep the movement of the piston in the cylinder, reduce frictional resistance, prevent the piston from directly contacting the cylinder wall, and avoid piston knocking.