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When selecting bearings, the main considerations are as follows

wallpapers News 2021-10-14
Roller bearings rely on rolling contact between the main parts to support rotating parts. Different roller bearings can withstand different radial and axial forces. When choosing roller bearings, the choice should be made according to the specific working conditions.
Roller bearings mainly include self-aligning roller bearings, thrust self-aligning roller bearings, tapered roller bearings and cylindrical roller bearings.
When selecting bearings, the main considerations are as follows:
Bearing load
The size, direction and nature of the load on bearings are the main factors in the selection of bearings.
When selecting bearings according to the size of the load, compared with the point contact of ball bearings, the main components of roller bearings are in line contact, which is easy to be used to bear the load, and the deformation after bearing is small.
When selecting bearings according to the direction of load, thrust bearings are generally selected for the pure axial load. A larger axial force selects thrust roller bearings. A smaller axial force is selected for thrust ball bearings. For pure radial load, deep groove ball bearings, cylindrical roller bearings or needle roller bearings are generally used. When under radial load at the same time, but also under small axial load, can choose deep groove ball bearings or tapered roller bearings; When the axial load is large, angular contact ball bearings or tapered roller bearings with large contact angles can be selected.
Bearing speed
In general, the speed will not have any effect on the selection of bearing type, but when the speed is large, it is necessary to include the speed in the standard of bearing selection.
(1) Compared with roller bearings, ball bearings have a higher limit speed, so in the case of high speed, priority is given to ball bearings.
(2) In the case of the same inner diameter, the smaller the outer diameter, the smaller the rolling body, so the centrifugal force added by the rolling body on the outer ring is smaller, so it is more suitable for working in the state of high speed. Needle roller bearings are more suitable for working at high speed.
The performance of bearing centering
When the centerline of the shaft does not coincide with the centerline of the bearing seat and there is an Angle error, or when the shaft is bent or tilted by force, the inner and outer ring axis of the bearing will be deflected. At this time, the self-aligning bearing or outer spherical ball bearing with the seat should be used.
Roller bearings are the most sensitive to the deflection of bearings, and the bearing capacity of such bearings in the deflection state may be lower than that of ball bearings. Therefore, when the shaft stiffness and the support stiffness of the bearing seat hole are low, or when there is a large deflection moment, the use of this kind of bearing should be avoided as far as possible.
Bearing installation and disassembly
When the bearing seat has no split surface and must be installed and disassembled along the axial direction, the bearing with separable inner and outer rings should be preferred.