Centering performance of bearing
When the bearing center line of the shaft is different from the center line of the bearing seat, there is an angle error, or the rigidity of the shaft is small due to the large distance between the two supports of the shaft, which is easy to bend or tilt under force, the self-aligning ball or self-aligning roller bearing with good self-aligning performance and outer ball bearing can be selected. This type of bearing can maintain normal operation when the shaft is slightly tilted or bent.
The quality of bearing centering performance is related to the allowable different axial degrees. The greater the value of different axial degrees, the better the centering performance.
Rigidity of bearing
The rigidity of bearing refers to the force required for bearing to produce unit deformation. The elastic deformation of rolling bearing is very small, which can not be considered in most machines, but in some machines, such as machine tool spindle, bearing rigidity is an important factor, and cylindrical and tapered roller bearings should be selected generally. Because when these two kinds of bearings bear load, their rolling elements and raceways belong to point contact and have poor rigidity.
In addition, all kinds of bearings can also be preloaded to increase the support rigidity. For example, angular contact ball bearings and tapered roller bearings, in order to prevent shaft vibration and increase support rigidity, a certain axial force is often applied in advance during installation to make them compact with each other. In particular, it is pointed out that the preload should not be too bearing large. If it is too large, the friction and temperature rise of the bearing will increase, which will affect the service life of the bearing.
