Grease is a lubricant composed of base oil, thickener and additives. When choosing, you should choose a grease that is very suitable for the use conditions of the bearing. Due to different brands of grease, there will be a big difference in performance, so you must pay attention when choosing.

Commonly used greases for bearings include calcium-based grease, sodium-based grease, calcium-sodium-based grease, lithium-based grease, aluminum-based grease and molybdenum disulfide grease. The amount of grease filled in the bearing should fill 1/2-1/3 of the internal space of the bearing. It should be reduced to 1/3 at high speed. Excessive grease can easily increase the temperature of running bearings.

Grease selection

When selecting grease according to the operating temperature, the main indicators should be the dropping point, oxidation stability and low-temperature performance. The dropping point can generally be used to evaluate high-temperature performance. The actual operating temperature of the bearing should be 10-20°C lower than the dropping point. The service temperature of synthetic grease should be 20-30°C below the dropping point. When selecting grease according to bearing load, grease with small penetration should be selected for heavy loads. When working under high pressure, in addition to small penetration, it must also have high oil film strength and extreme pressure performance. When selecting grease according to environmental conditions, calcium-based grease is not easily soluble in water and is suitable for dry and less moisture-rich environments.

Bearing lubricant

Under high-speed and high-temperature conditions, oil lubrication can be used when grease lubrication is no longer suitable. Through the circulation of lubricating oil, a large amount of heat can be taken away. Viscosity is an important characteristic of lubricating oil. The viscosity directly affects the fluidity of lubricating oil and the thickness of the oil film formed between friction surfaces. The viscosity of lubricating oil at the bearing operating temperature is generally 12-15 cst. The higher the speed, the lower the viscosity, and the heavier the load, the higher the viscosity. Commonly used lubricating oils include machinery oil, high-speed machinery oil, turbine oil, compressor oil, transformer oil, cylinder oil, etc.