The car is combined by tens of thousands of parts. The accuracy of the coordination between the engine parts is high, and the friction is inevitable during the work of the parts.Earthquake buffer and other functions.Lubricating oil has a huge function and has a great effect on cars. Therefore, choosing lubricating oil is an important choice. High -quality lubricant is very obvious for driving experience.
The role of lubricating oil
1. Lubrication and grinding
When the engine is running, if some friction sites do not get appropriate lubrication, dry friction will be produced.Practice has proved that the heat generated by dry friction in a short period of time is enough to melt the metal, causing damage to the parts or even stuck (many cars with water leakage or oil leakage, and the main reason for pulling the cylinder, holding axis, etc.).Therefore, the friction site in the engine must be given good lubrication.When the lubricating oil flows to the friction site, it will adhere to the surface of the friction to form a layer of oil film to reduce the resistance between the friction parts. The strength and toughness of the oil membrane are the key to exert its lubrication effect.
2. Cooling and cooling
The heat generated by fuel after combustion in the engine has only a small part for power output and friction resistance consumption and the drive of auxiliary agencies. In addition to the exhaust air to the atmosphere, most of the remaining heat will also be cooled medium bands in the engine.Take part.The excess heat in the engine must excrete the body, otherwise the opportunity will burn out due to the high temperature.On the one hand, the engine cooling system is completed, and on the other hand, it rely on lubricant to absorb heat from the surface of the cylinder, piston, crankshaft and other surfaces and bring it to the oil bottom shell.
3. Washing and cleaning
There are many dirt during engine work.Such as the sand and dust brought in the air, carbon accumulation formed after the mixed gas is burned, the glue -like material generated after lubricating oil oxidation, the friction between the parts to produce metal dandruff and so on.These dirts are attached to the friction surface of the machine parts. If it is not cleaned, it will increase the wear of the parts.In addition, a large amount of glue will cause the piston ring to stagnate, resulting in the engine that cannot operate normally.Therefore, these dirt must be cleaned in time. The cleaning process is completed by circulating in the body by lubricating oil.
4. Sealing and leakage
The engines cylinder and piston, piston ring and ring grooves, and the valve and valve seats have a certain gap, which can ensure that the motion deputy will not stagnate.However, these gaps can cause poor sealing of the cylinder. As a result, the burning chamber leakage is to reduce the pressure of the cylinder and the output power of the engine.The oil membrane formed by lubricating oil in these gaps ensures the sealing of the cylinder, maintains the pressure of the cylinder and the output power of the engine, and can prevent the exhaust gas from entering the crankshaft box down.
5. Prevent rust and corrosion
When the engine is running or stored, atmosphere, lubricating oil, water in fuel, and acidic gases generated by combustion will cause corrosion and rust to the parts, thereby increasing the damage of friction surface.The oil membrane formed on the surface of the parts can avoid direct contact with water and acidic gas to prevent corrosion and rust.
6. Shock reducing buffer
At the end of the compression stroke, the mixed gas began to burn, and the pressure of the cylinder rose sharply.At this time, the lubricating oil in the bearing gap will alleviate the impact load suffered by the piston, piston sales, connecting rods, crankshafts and other parts to make the engine work steadily, and prevent directly contact with metals and reduce wear.
Classification of lubrication oil
mineral oil
At present, the oil on the market can be simply divided into two types: mineral oil and synthetic oil due to their basic oil.The synthetic oil is divided into: all -harmony and semi -coexistence.Full synthetic motor oil is the highest level.In terms of relative synthetic oils, the strength of the basic oil is weak, and it is necessary to use the viscosity that is relatively large to the synthetic oil to meet the lubrication needs when high load.
Full synthetic engine oil
Popularly speaking, the mineral base oil is used to replace the ester or polylene class, and then mixes with the additive, which is the synthetic engine oil. Generally, the word "Synthetic" will be marked on the synthetic oil barrel.Synthetic engine oil has the characteristics of good stability and good durability, so generally speaking, the oil exchange cycle of the engine with full synthetic engine oil can be extended to 7500-10,000 kilometers.
Semi -co -formation oil
The semi -synthetic engine oil is a lubricating oil made of the three types of basic oil in the world. It is the product of purifying the hydrogenation fission technology on the basis of mineral oil.The purity of semi -synthetic oil is very close to the full synthetic oil, but its cost is slightly higher than mineral oil. It is an ideal transition product for mineral oil to synthetic oil.
The difference between lubricating oil and oil
1. Machine oil: The engine lubricating oil can play a role in lubricating and grinding, assisting cooling and cooling, sealing leak -proof, anti -corruption, and shock absorption buffer.
2. Lubricating oil: It is used on various types of cars and machinery to reduce friction and protect liquid or semi -solid lubricant of machinery and processing containers. It has the functions of lubrication, auxiliary cooling, rust -proof, cleaning, sealing and buffering.
3. Comparison analysis: The scope of the two is different. Machine oil is a kind of lubricant, but lubricating oil is not necessarily motor oil.Butter is also lubricating oil, but it is not oil.Lubricating oil is a kind of oil liquid used to reduce friction to the machine, equipment or friction.Such as gear oil, anti -abrasion hydraulic oil, etc.Oil is commonly known as engine lubricating oil.And motor oil is just a kind of lubricating oil.Its like the relationship between motor vehicles and cars.

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