Influence of Preload of Cylindrical Roller Bearing on Service Life

Due to the existence of clearance in bearing.com/cylindrical-roller-bearings.html' target='_blank'>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. influences. In order to reduce this vibration, for high-precision and high-speed mechanical equipment, the preloading method is often used when installing cylindrical roller bearings, that is, a certain load (radial or axial) is given to the cylindrical roller bearing in advance during installation. , eliminate its original clearance, and elastically deform the cylindrical roller bearing body and the inner and outer rings, 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 influence of dust in timken bearing grease on noise has been tested, and it has been proved that the more dust, the greater the noise. 3. Influence on lubricating performance The decrease in the cleanliness of timken bearings not only affects the formation of lubricating oil film, but also causes the deterioration of grease and accelerates its aging. First, the purpose of preloading is to preload the spindle cylindrical roller bearing, The original clearance of the ball and the raceway is eliminated and a certain elastic deformation is formed. When subjected to external loads, the cylindrical roller bearing has a certain rigidity. For cylindrical roller bearings installed in the opposite direction to the external load, it is not Due to the external load, there will be a gap between the ball and the raceway, thereby improving the rotation accuracy of the main shaft, strengthening the rigidity of the main shaft and improving the service life, and at the same time reducing noise. Second, the principle of preloading The size of the preloading load is generally determined according to the size of the working load, the rotation accuracy of the spindle and the speed of the rotation. 1. If the spindle load is small, the rotation precision is high and the rotation speed is low, a larger preload is preferable. 2. If the working load is large and the rotating speed is high, because it is easy to heat and expand, a smaller preload should be adopted.

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