Six functions of lubricating oil
Issuing time:2021-12-19 20:35Author:YIRUNDE GREASE
Although the key role of lubricating oil is lubrication, it has always been one post with multiple jobs, which plays a vital role in the operation of the engine. If the lubricating oil loses its effect, the engine may suffer more serious damage.
When repairing the engine, maintenance personnel sometimes find that the piston rod skirt is bruised, or that the surface of the cylinder wall is severely damaged. How can this happen? The engine speed ratio is very high when the engine is working, and the piston rod and cylinder The middle of the wall, the piston pin of the crankshaft and the middle of the engine crankshaft are closely matched. If this matched part cannot be lubricated in many ways, it will cause dry friction. The heat caused by dry friction in a short period of time is enough to melt the metal material, resulting in the destruction of parts and even jamming (piston rod engine cylinder, engine crankshaft, etc.), so it is necessary to give good lubrication to the matching parts of the engine. When the lubricating oil flows to the mating parts, it will produce a layer of slick oil on the friction surface. In order to ensure that the lubricating oil can reach the mating surface as soon as possible, the engine lubricating oil must have a certain working pressure. When the lubricating oil pressure is not enough, the oil pressure on the dashboard reminds the light festival to illuminate.
2. Sealing effect
There is a certain gap between the cylinder and piston rod of the engine, the piston and the mandrel of the engine, the cylinder and the valve seat, which can ensure that the mating parts are not easily blocked during fitness exercises, but this gap is very easy to cause the engine combustion chamber The mixed gas in the crankcase flees into the crankcase, which not only accelerates the mildew of the lubricating oil, but also continues to reduce the cylinder pressure and the power of the engine. The lubricating oil can generate floating oil in the gaps of the mating parts, and this floating oil can have a sealing effect and ensure the sealing performance of the hydraulic cylinder. Maintenance personnel sometimes encounter situations where the engine cylinder pressure is low. Some people will add a small amount of lubricating oil to the engine according to the nozzle hole, and then check the cylinder pressure. This kind of help to distinguish common faults is to use lubricating oil. The sealing function.
3. Cleanup effect
The internal office environment of the engine is extremely extreme. According to the components formed after the dust and mixed gas sucked into the engine by the intake duct are not fully incinerated, carbon deposits are generated on the cylinder and the inner wall of the cylinder. The lubricating oil is continuously oxidized by the air inside the engine, and metal oxides It is also prone to grease and carbon deposits. Carbon deposits are very harmful to the operation of the engine. It not only endangers the sufficient ignition of the mixed gas, but also causes the internal part of the engine to be too hot. A lot of jelly will cause the engine piston to stick and cause the engine to fail to operate normally. . Therefore, this waste must be removed immediately. The entire cleaning process is carried out by the circulation of lubricating oil in the human car. The lubricating oil contains detergents and wetting agents to eliminate carbon deposits, which can clean the surface of metal materials, disperse stains, and maintain the internal cleaning of the engine. When the lubricating oil is replaced, this kind of residue is discharged with the lubricating oil, so the lubricating oil will show a darker hue.
4. Refrigeration effect
When the engine is working, it will cause a lot of heat. The vast majority of this heat is brought by the circulation system of the engine refrigeration system, and part of it is sent to the engine after the lubricating oil digests and absorbs energy from the internal surfaces of the engine such as cylinders and piston rods. Released in the engine oil pan.
5. Buffering effect
When the engine starts, accelerates or the load changes greatly, the cylinder liner, the large and small ends of the crankshaft, and the crankshaft piston pin of the engine all have to bear the strong change of vibration. The lubricating oil with moderate viscosity can digest and absorb part of the impact kinetic energy. , Has the function of caching.
6. Anti-rust treatment effect
When the engine is running or placed, the moisture in the air intake and the acid gas generated by ignition will cause corrosion of metal material components such as engine pistons and piston pins. The anti-rust oil contained in the lubricating oil and other multi-effect additives with anti-rust treatment characteristics, this additive produces a neatly ordered high-density absorption layer on the surface of the metal material, and reasonably restrains the various corrosion components. Invasion.