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The choice of roller bearings?

wallpapers Low Carbon 2020-05-20
Bearing load
The size, direction, and nature of the load on the bearing are the main factors in choosing the bearing.
When selecting a bearing according to the magnitude of the load, compared with the point contact of a ball bearing, the main elements in the roller bearing are line contacts, which are easy to use for the load and the deformation after the amount is also small.
When selecting bearings according to the load direction, thrust bearings are generally chosen for pure axial loads. The more significant axial force decides thrust roller bearings. For smaller axial forces, select thrust ball bearings. For pure radial loads, deep groove ball bearings, cylindrical roller bearings or needle roller bearings are generally used. When under radial load, but also under a small axial load, you can choose deep groove ball bearings or tapered roller bearings; when the axial load is large, you can select an angular contact ball with a large contact angle bearings or tapered roller bearings.
Bearing speed
Under normal circumstances, the speed will not have any impact on the choice of bearing type, but when the rate is significant, the speed should be included in the selection criteria of the bearing.
(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 lower the rolling element, so the centrifugal force of the rolling component on the outer ring is smaller, so it is more suitable for working at high speed. According to the properties given in Table 1, needle roller bearings are ideal for working at high rates.
Alignment performance of bearings
When there is an angle error between the centerline of the shaft and the centerline of the bearing housing, or when the rod is bent or tilted by the force of the shaft, the axes of the inner and outer rings of the bearing will be skewed. At this time, self-aligning bearings or spherical ball bearings with seats with confident self-aligning performance should be used.
Roller bearings are most sensitive to the deflection of bearings. The bearing capacity of such bearings in the deflection state may be lower than that of ball bearings. Therefore, when the stiffness of the shaft and the support stiffness of the bearing seat hole are weak, or when there is a massive deflection moment, such bearings should be avoided as much as possible.
Bearing installation and removal
When the bearing housing has no split surface, and parts 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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