As a critical component of internal combustion engines, piston rings significantly impact engine performance and lifespan while ensuring normal operation. The primary function of piston rings is to form a seal between the piston and cylinder wall, reduce friction losses, and guide the flow of lubricating oil and coolant.

The piston ring is an essential component in diesel engines that prevents gas and lubricating oil from leaking from the cylinder pressure area to the opposite side or entering the crankcase, ensuring proper engine operation.

Piston rings are located in the grooves at the top and bottom of the piston, maintaining close contact with the cylinder wall. During operation, the piston ring forms a sealed chamber between the piston and cylinder wall through its inherent elasticity and specialized design.

Piston rings typically consist of multiple rings that connect closely on both sides. Common structures include oil rings, oil control rings, and upper/lower spiral grooves. Different ring structures perform distinct functions such as cylinder sealing, heat conduction, and lubrication.