Lubrication plays an important role in the normal operation of machinery and equipment.

(1) Reduce friction coefficient

Adding a lubricant between two relatively frictional surfaces to form a friction-reducing layer of a lubricant film can reduce the friction coefficient, feed friction resistance, and reduce power consumption. For example, under good liquid friction conditions, the friction coefficient can be reduced by as low as 0.001. The frictional resistance at this time is mainly the low shear resistance between the molecules sliding inside the liquid lubricating film.

(2) Reduce wear

The lubricant between the friction surfaces can support the wear caused by hard abrasion, surface rust, bite welding and tearing between metal surfaces. Therefore, by supplying sufficient lubricant between the friction surfaces, good lubricating conditions can be formed, the oil film can be prevented from being damaged, and the fitting accuracy of the parts can be maintained, thereby greatly aiding wear and tear.

(3) Reduce the temperature

Lubricants can reduce the friction coefficient and support the generation of friction heat. We know that a working machine overcomes the work done by friction and converts it into heat, part of which is diffused outward from the body and part of it constantly increases the temperature of the machine. The centralized circulation lubrication system using liquid lubricant can take away the heat generated by friction, reduce the temperature, and make the machine control to operate within the required temperature range.

(4) Prevent corrosion and protect metal surfaces

Mechanical surface, there is no way to avoid contact with the surrounding medium (such as air, moisture, water vapor, corrosive gas and liquid, etc.) to make the metal surface of the machine rust, corrosion and damage. Corrosive wear in high temperature workshops and chemical plants in metallurgical plants appears severe.

(5) Cleaning and washing effect

The abrasive particles or foreign media generated by the friction pair during movement will accelerate the friction surface and wear. By using the fluidity of the liquid lubricant, the abrasive particles between the friction surfaces can be taken away, thereby reducing abrasive wear. In pressure circulation systems, flushing action. Process lubricants are used in cold rolling, hot rolling and cutting, grinding, drawing and other processing processes. In addition to cooling and cooling, it also has a good rinsing effect, preventing the surface from being scratched by solid impurities and making the finished product (steel ) The surface has better quality and surface roughness. For example, a suspension and dispersion additive is added to the lubricating oil used in the cylinder of an internal combustion engine, so that the gel and coke formed in the oil are washed from the cylinder wall and dispersed into small particles and suspended in the oil, along with the circulating oil filter Filtration to keep the oil clean, reduce cylinder wear and increase oil change intervals.

(6) Sealing effect

For the cylinders and pistons of steam engines, compressors, internal combustion engines, etc., the lubricating oil can play a role of lubricating and reducing wear, and it can also increase the sealing effect so that it does not leak air during operation and increase work efficiency.

Grease has a role in forming a seal, and can prevent water or other dust and impurities from entering the friction pair. For example, the use of grease-coated oil-filled packing can not only have a good lubrication effect on the seal of the pump shaft head, but also can prevent leakage and dust impurities from entering the pump body and play a good sealing role.

In addition, lubricants have the effect of reducing vibration and noise.