How to choose the steel roller bearings correctly?

Steel roller bearings is a kind of rolling bearing, and it is one of the parts widely used in modern machinery. It relies on the rolling contact between the main components to support the rotating parts. Roller bearings are now mostly standardized. steel roller bearings have the advantages of small starting torque, high rotation accuracy, and convenient selection.

steel roller bearings are divided into ball bearings and roller bearings according to the rolling force.
Roller bearings rely on the rolling contact between the main parts to support the rotating parts. Different roller bearings can withstand different radial and axial forces. When choosing roller bearings, the choice should be made according to specific working conditions.

steel roller bearings mainly include spherical roller bearings, thrust spherical roller bearings, tapered rollers and cylindrical roller bearings, etc.

When selecting bearings, the main considerations are as follows:
Bearing load
The size, direction and nature of the load on the steel roller bearings are the main factors for selecting the bearing.
When selecting the bearing according to the size of the load, compared to the point contact of the ball bearing, the main elements in the roller bearing are in line contact, which is easy to bear the load and the deformation after the load is small.
When selecting bearings according to the load direction, for pure axial loads, thrust bearings are generally selected. For larger axial force, choose thrust roller bearings.

Choose thrust ball bearings for smaller axial forces. For pure radial loads, deep groove ball bearings, cylindrical roller bearings or needle bearings are generally used. When bearing a radial load while still bearing a small axial load, deep groove ball bearings or tapered roller bearings can be selected; when the axial load is large, angular contact balls with larger contact angles can be selected Bearing or tapered roller bearing.

Bearing speed
Under normal circumstances, the speed will not have any effect on the choice of bearing type, but when the speed is large, the speed should be included 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, ball bearings are given priority.
(2) In the case of the same inner diameter, the smaller the outer diameter, the smaller the rolling elements, so the centrifugal force added to the outer ring by the rolling elements is smaller, so it is more suitable for working at high speeds. According to the properties given in Table 1, needle roller bearings are more suitable for working at high speeds. 
Bearing's self-aligning performance
When the center line of the shaft does not coincide with the center line of the bearing seat and there is an angular error, or when the shaft is bent or inclined due to force, the axis of the inner and outer rings of the bearing will be deflected. At this time, a self-aligning bearing with a certain degree of self-aligning performance or an outer spherical ball bearing with a seat should be used.

steel roller bearings are most sensitive to the deflection of the bearing, and the load carrying capacity of this type of bearing under deflection 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 type of bearing should be avoided as much as possible. 
Bearing installation and removal
When the steel roller bearings seat has no split surface and components must be installed and removed in the axial direction, bearings with separable inner and outer rings (such as N0000, NA0000, 30000, etc.) should be preferred.

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