1. Lubrication and anti-friction: There is rapid relative sliding between the piston and the cylinder, and between the main shaft and the bearing bush. To prevent the parts from wearing too fast, it is necessary to establish an oil film between the two sliding surfaces. The oil film of sufficient thickness separates the surfaces of the relatively sliding parts, so as to achieve the purpose of reducing wear.
2. Cooling and cooling: The oil can bring heat back to the oil tank and then radiate to the air to help the water tank cool the engine.
3. Cleaning and cleaning: Good engine oil can circulate the carbides, sludge, and wear metal particles on engine parts back to the engine oil tank. The flow of lubricating oil washes away the dirt on the working surface of the parts.
4. Sealing and anti-leakage: The oil can form a sealing ring between the piston ring and the piston to reduce gas leakage and prevent external pollutants from entering
5. Anti-rust and anti-corrosion: Lubricating oil can absorb the surface of the parts to prevent the contact of water, air, acidic substances and harmful gases with the parts.
6. Vibration damping and buffering: When the engine cylinder port pressure rises sharply, the load on the piston, piston chips, connecting rod and crankshaft bearing is suddenly increased. This load is transmitted and lubricated by the bearing, so that the impact load is buffered. .