Located in the groove below the compression ring, this critical sealing component controls oil film thickness and regulates oil supply between the piston and cylinder wall.

• Sealing: Prevents leakage of combustion gases and lubricating oil
• Lubrication: Forms protective oil film to reduce friction and wear
• Guidance: Ensures stable and precise piston movement
• Heat Dissipation: Transfers heat from piston to cylinder wall
• Contamination Prevention: Blocks impurities from entering critical engine areas

Positioned in the top groove of the piston, this primary sealing component prevents high-temperature, high-pressure gas leakage into the crankcase or cooling system.

Piston rings feature multiple closely connected rings with specialized structures including oil rings, oil control rings, and spiral grooves. Each configuration serves distinct functions in cylinder sealing, heat conduction, and lubrication.