English
Español
Deutsch
Selecting bearings from rigidity, vibration and noise, and axial movement
Author:admin Date:2023-05-06
As an essential and important component in mechanical products, bearings play an important role in supporting the rotating shaft. Rolling bearings have their own structural characteristics and performance advantages and disadvantages. When selecting them, it is necessary to consider the actual situation comprehensively. So, how can we purchase suitable rolling bearings?
1. Select according to rigidity
Under the same size, the stiffness of roller bearings is greater than that of ball bearings. In most applications, rigidity issues do not need to be considered. Only in situations where high rotational accuracy is required, such as spindle bearings, thin plate rolling mills, and other bearings, stiffness is required. For selected bearings, especially angular contact bearings and bearings with tight sleeves, the stiffness of the bearings can also be improved by appropriate preloading.
2. Selected according to vibration and noise
For working conditions requiring low vibration and noise, low-noise bearings such as Deep Groove Ball Bearing, cylindrical roller bearings and tapered roller bearings can be selected. Among them, Deep Groove Ball Bearing has the lowest vibration and noise limits.
3. Select according to axial movement
In the support of the shaft, usually one end of the shaft uses a positioning bearing to limit the free travel of the shaft, and the other end uses a free moving bearing to compensate for the axial elongation or shortening caused by thermal expansion of the shaft in use. Positioning bearings should be Deep Groove Ball Bearing, double row or paired angular contact ball bearings, or two-way thrust bearings that only bear axial load to achieve axial limit. Floating bearings usually use NU and N cylindrical roller bearings without ribs in inner or outer rings, or NJ cylindrical roller bearings or needle roller bearings. If Deep Groove Ball Bearing, self-aligning roller bearing and other inseparable bearings are used, clearance fit shall be used for the fit of inner ring or outer ring.
1. Select according to rigidity
Under the same size, the stiffness of roller bearings is greater than that of ball bearings. In most applications, rigidity issues do not need to be considered. Only in situations where high rotational accuracy is required, such as spindle bearings, thin plate rolling mills, and other bearings, stiffness is required. For selected bearings, especially angular contact bearings and bearings with tight sleeves, the stiffness of the bearings can also be improved by appropriate preloading.
2. Selected according to vibration and noise
For working conditions requiring low vibration and noise, low-noise bearings such as Deep Groove Ball Bearing, cylindrical roller bearings and tapered roller bearings can be selected. Among them, Deep Groove Ball Bearing has the lowest vibration and noise limits.
3. Select according to axial movement
In the support of the shaft, usually one end of the shaft uses a positioning bearing to limit the free travel of the shaft, and the other end uses a free moving bearing to compensate for the axial elongation or shortening caused by thermal expansion of the shaft in use. Positioning bearings should be Deep Groove Ball Bearing, double row or paired angular contact ball bearings, or two-way thrust bearings that only bear axial load to achieve axial limit. Floating bearings usually use NU and N cylindrical roller bearings without ribs in inner or outer rings, or NJ cylindrical roller bearings or needle roller bearings. If Deep Groove Ball Bearing, self-aligning roller bearing and other inseparable bearings are used, clearance fit shall be used for the fit of inner ring or outer ring.
