The Function Of The Lubrication System

The function of the lubrication system is to deliver a quantitative amount of clean lubricating oil to the surface of each moving part. The specific functions are as follows.

1. Lubrication lubricates the surface of moving parts, reduces frictional resistance and wear, and reduces the power consumption of the engine spare parts.

2. Cleaning action The oil circulates continuously in the lubrication system to clean the friction surface and take away the wear debris and other foreign objects.

3. Cooling effect The oil circulating in the lubrication system can also take away the heat generated by friction and play a cooling role.

4. Sealing action Forming an oil film between moving parts (such as pistons and cylinders) can improve their tightness and help prevent air or oil leakage.

5. The anti-corrosion effect forms an oil film on the surface of the parts, which protects the surface of the parts and prevents corrosion and rust.

6. Hydraulic action lubricating oil can also be used as hydraulic oil, such as hydraulic action in hydraulic tappet.

7. The buffering effect forms an oil film on the surface of the moving parts, which can absorb the impact and reduce the vibration, and play the role of shock absorption and buffering. Due to the different working conditions of the moving parts of the engine, the requirements for lubrication strength are also different, so different lubrication methods should be adopted accordingly.

1) Pressure lubrication uses an oil pump to continuously send lubricating oil with a certain pressure to the friction surface. For example, the main bearing of the crankshaft, the connecting rod shaft and the camshaft shaft bear a large load and relative movement speed, and it is necessary to transport the oil to the friction surface with a certain pressure to form an oil film to ensure lubrication. This type of lubrication is called pressure lubrication.

2) Splash lubrication The lubrication method that uses the oil droplets or oil mist splashed by the moving parts when the engine is working to lubricate the friction surface is called splash lubrication. This kind of lubrication method can lubricate the exposed cylinder wall with light load, the piston pin with relatively small sliding speed, and the cam surface and tappet of the valve train.

3) Regular lubrication Some parts in the engine auxiliary system only need to be lubricated with grease (butter) regularly, such as the permanent lubrication of engine water pump and generator shaft. In recent years, bearings containing wear-resistant lubricating materials (such as nylon, molybdenum disulfide, etc.) have been used in some engines to replace greased bearings.

The selection of engine oil should take into account the viscosity and quality of the oil. The quality of the oil directly affects the service life of the engine. After the oil has been used for a period of time, due to chemical changes caused by high temperature, it is difficult to form an oil film due to dilution and viscosity reduction, and the acid content increases to corrode the parts. In addition, the oil is mixed with metal abrasive dust, sand, dust and other impurities during use, which leads to the deterioration of the oil. . If the deteriorated oil is sent to the surface of the moving parts, it will not only fail to lubricate, but also accelerate the wear of these parts, causing the engine to not work properly. Therefore, the oil should be changed regularly.

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