Take the engine as an example to illustrate the role of lubricating oil
When the engine is running, dry friction will occur if some friction parts are not properly lubricated. Practice has proved that the heat generated by dry friction in a short period of time is enough to melt the metal, causing damage or even seizure of the parts (this is the main reason why many cars with water leakage or oil leakage have cylinder pulling, axle holding and other failures). Therefore, the friction parts in the engine shall be well lubricated. When the lubricating oil flows to the friction part, it will adhere to the friction surface to form an oil film, reducing the resistance between friction parts. The strength and toughness of the oil film is the key to play its role in lubrication.
2. Cooling action
Only a small part of the heat generated by fuel combustion in the engine is used for power output, friction resistance consumption and drive of auxiliary mechanism; Most of the remaining heat will be taken away by the cooling medium in the engine in addition to being discharged into the atmosphere with the exhaust gas. Excess heat in the engine is discharged from the engine body, otherwise the engine will burn out due to excessive temperature. On the one hand, this is accomplished by the engine cooling system, and on the other hand, the lubricating oil absorbs heat from the surfaces of cylinders, pistons, crankshafts, etc. and then takes it to the oil pan for emission.
3. Washing action
The engine will produce a lot of dirt during operation. For example, sand and dust brought by inhalation of air, carbon deposit formed after combustion of mixed gas, colloidal substances generated after oxidation of lubricating oil and lubricating oil, metal chips generated by friction between parts, etc. These dirt will adhere to the friction surface of the machine parts. If they are not cleaned, they will increase the wear of the machine parts. In addition, a large amount of gum will cause the piston ring to stick and cause the engine to not operate normally. Therefore, the dirt shall be cleaned in time. This cleaning process is completed by circulating lubricating oil in the body.
4. Sealing effect
There are certain clearances between the cylinder and piston, piston ring and ring groove, and between the valve and valve seat of the engine, so as to ensure that there is no jamming between the motion pairs. However, these clearances can cause poor cylinder sealing, and the result of combustion chamber leakage is to reduce cylinder pressure and engine output power. The oil film formed by the lubricating oil in these gaps ensures the tightness of the cylinder, maintains the cylinder pressure and engine output power, and prevents the exhaust gas from flowing downward into the crankcase.
5. Antirust effect
When the engine is running or stored, the moisture in the atmosphere, lubricating oil, fuel and the acid gas generated by combustion will cause corrosion and rust to the parts, thus increasing the damage to the friction surface. The oil film formed by lubricating oil on the surface of the parts can prevent the parts from directly contacting with water and acid gas, and prevent corrosion and rust.
6. Remove impact load
At the end of the compression stroke, the mixture starts to burn and the cylinder pressure rises sharply. At this time, the lubricating oil in the bearing clearance will ease the impact load on the piston, piston pin, connecting rod, crankshaft and other parts, so that the engine can work stably, and prevent the metal from contacting directly to reduce wear.
The above is a detailed introduction of Jinan lubricating oil manufacturers. I hope it will be helpful to you. If you have any questions, please contact us. We will provide you with our attitude https://www.smxnykj.com/