What are the functions of the piston ring?

Distribute the oil splashed or sprayed on the cylinder wall evenly on the cylinder wall, and scrape off the excess oil. The scraped oil flows back to the crankcase through the gap between the piston and the cylinder liner and the drain hole of the piston oil groove

(1) Oil control function

Distribute the oil splashed or sprayed on the cylinder wall evenly on the cylinder wall, and scrape off the excess oil. The scraped oil flows back to the crankcase through the gap between the piston and the cylinder liner and the drain hole of the piston oil groove. The oil ring controls 70% to 90% of the oil, and the gas ring controls 10% to 20% of the oil.

(2) Support function

When the piston and piston ring reciprocate synchronously, the piston exerts a large positive pressure on the piston ring, that is, reciprocating inertial force. When the crank connecting rod generates side pressure on the piston and wants to make the piston yaw, the piston ring exerts a frictional reaction force on the piston due to the positive pressure, thereby supporting the piston.

(3) heat conduction function

70% of the heat on the piston is guided to the cylinder wall through the end face of the piston ring, and the channel and the second channel play a leading role in heat conduction to ensure the thermal balance of the piston.

(4) Sealing function

In the compression and work stroke, the piston ring seals the gas from top to bottom, in which the ring seals 80% to 90% of the gas, the second ring seals 10% to 20% of the gas, and the third ring is the oil ring, which seals about 5% of the gas.

When the engine oil consumption is large, you should pay attention to distinguish it. It is different from the blue smoke caused by the large sulfur content in the fuel. Pay attention to the difference in the sound of knocking the cylinder, and the phenomenon of malfunctions such as cylinder pressure drop. In particular, check whether the piston ring is broken. If there is no fracture phenomenon, check whether the technical dimensions of the piston ring are normal and judge the failure of the piston.