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And there's sliding and friction. This is not conducive to the formation of lubrication film, which can easily lead to wear. Greases with higher base oil viscosity (ISO VG 150 to 460 or higher) should be selected. Addition of anti-wear additives, NLGI 2, may also be required. 2) Speed grease should be matched with bearing speed parameters. This mainly depends on the type and proportion of thickener and base oil. The speed parameter of grease is not a material parameter, but depends on the type of bearing and the shortest running time required. Generally speaking, high speed or low starting torque rolling bearings need to choose grease with higher speed parameters. For low speed rolling bearings, the grease with lower speed parameters is recommended. 3) In order to obtain good lubrication effect and long service life, it is usually recommended to choose grease according to the temperature of the bearing in the standard operating range. The working temperature range and stability of grease at high temperature depend on the type and proportion of thickener and base oil, production quality and production process. Other factors that need to be considered include the maximum applicable temperature, dropping point (the temperature at which grease is heated under specified conditions to reach a certain fluidity, known as dropping point), and the lowest applicable temperature. 4) Load because the cone penetration of grease is related to the load that can be borne in use, the grease with small cone penetration (greater consistency) should be selected for heavy load; if it bears heavy load and impact load, the grease with extreme pressure additives, such as the grease with molybdenum disulfide, should be selected. 5) If the working environment is humid, water vapor is easy to invade the bearing. If the temperature suddenly cools and heats up, the water will condensate easily. When there are large holes in the bearing or housing, this