The commonly used lubricants are lubricating oil and grease. When the peripheral speed of the shaft is less than 4~5m/s, grease is generally used. The advantages of grease lubrication are: the sealing structure is simple, the grease is not easy to lose, it is not affected by the temperature, and the grease can be added for a long time. However, the amount of grease filled into the bearing should be appropriate, generally filling 1/3~1/2 of the bearing cavity. When there is lubricating oil where the bearing is installed, if there is oil for lubricating the gear in the reducer, or the whole machine has a centralized oil supply device, lubricating oil can also be used to lubricate the bearing. The grade of lubricating oil should be selected according to the requirements of main parts, and the amount of lubricating oil should be appropriate. When oil immersion lubrication is used, the height of the oil level should not exceed the centerline of the lowermost rolling element of the bearing. When splash lubrication is used, the peripheral speed of the splash oil parts should not be lower than 3m/s to ensure a sufficient concentration of oil mist.

Solid lubricants

There are many substances that can be used as solid lubricants, including metals, metal compounds, inorganic substances, organic substances, etc. Among them, molybdenum disulfide and graphite lubricants are the most commonly used. Molybdenum disulfide lubricant is a powder with a lead gray to black luster, which is characterized by good lubricity, adhesion, temperature resistance, pressure and wear resistance, oxidation resistance and chemical corrosion resistance. Equipment working at high speed, high temperature, high load, low temperature and chemically corrosive environment has excellent lubricating effect.