Due to the existence of clearance in cylindrical roller bearings, under the action of load, the inner and outer rings will move relative to each other, which will reduce the rigidity of cylindrical roller bearings, cause radial and axial vibration of the shaft, and affect the working accuracy and life of the machine. Influence. In order to reduce this kind of vibration, for high-precision and high-speed mechanical equipment, the method of preloading is often used when installing cylindrical roller bearings, that is, a certain load (radial or axial) is given to the cylindrical roller bearings in advance during installation. , Eliminate its original clearance, and make the cylindrical roller bearing body and inner and outer rings elastically deformed, thereby preventing relative movement between the inner and outer rings during operation. 1. Cleanliness seriously affects the vibration level of the bearing, especially the vibration in the high frequency band is more significant. Bearings with high cleanliness have low vibration velocity values. 2. The impact on noise. The effect of dust in bearing grease on noise has been tested, and it has been proved that the more dust there is, the greater the noise will be. 3. The impact on lubrication performance The decline of bearing cleanliness not only affects the formation of lubricating oil film, but also causes the deterioration of lubricating grease and accelerates its aging. 1. The purpose of preloading Preload the cylindrical roller bearing of the main shaft, so that the original clearance of the ball and the raceway is eliminated and a certain elastic deformation is formed. When the external load is applied, the cylindrical roller bearing already has a certain rigidity. Cylindrical roller bearings installed in opposite directions will not create a gap between the ball and the raceway due to external loads, thereby improving the rotation accuracy of the main shaft, strengthening the rigidity of the main shaft and increasing the service life, while reducing noise. 2. The principle of preloading The size of the preload is generally determined according to the size of the working load, the rotation accuracy of the spindle and the speed. 1. If the spindle load is small, the rotation accuracy is high and the speed is low, a larger preload is desirable. 2. If the working load is large and the speed is high, it is easy to heat and expand, so a small preload should be selected.  

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