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Why cylindrical roller bearings only bear radial loads?

Source:  skf bearing  Time:  2021-07-26

Cylindrical roller bearings are generally only used to bear radial loads. Only single-row bearings with ribs on the inner and outer rings can bear smaller directional axial loads or larger gap axial loads.


What is bearing load?


Bearing load is the load received by the bearing during use, including lateral load and longitudinal load.


Bearing radial load and axial load


Radial load refers to the load whose acting direction is perpendicular to the axis of the bearing.


Axial load refers to the direction along the axis bai of the shaft, and the radial direction perpendicular to it is the radial direction of du along the shaft. Therefore, the zhi axial load of the bearing refers to the load generated in the dao axis direction of the bearing. Generally speaking, it is the force that pushes the inner ring of the bearing out of the outer ring.

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The relationship between bearing and load direction:


Under normal circumstances, for pure radial load requirements, deep groove ball bearings or cylindrical roller bearings can be selected. If it is a thrust ball bearing, then it is only suitable for bearing a moderate amount of pure axial load. Moreover, one-way thrust ball bearings can only withstand bearing loads from one direction.


If it is a two-way thrust ball bearing, or a two-way thrust angular contact bearing, then it can withstand the axial load in two directions. For example, if the bearing is subjected to combined radial and axial loads, then angular contact ball bearings or tapered roller bearings are usually used. And if it is a four-point contact ball bearing and a two-way thrust angular contact ball bearing, then it can withstand the combined load in both directions with the advantage of the bearing load.


However, if the bearing load in the combined load is relatively large, then the thrust bearing is only used to bear the axial load, and is not related to the radial load. If a suitable single-row radial ball bearing or a four-point contact ball bearing is used to bear the axial load, then an appropriate radial clearance should be maintained between the outer ring and the seat hole.


If the load is off the center of the bearing, it may cause overturning moment. According to stainless steel bearing manufacturers, double row ball bearings can withstand overturning moments. However, it is recommended that you choose paired angular contact balls or paired tapered roller bearings. Face-to-face type, back-to-back type is better. Of course, cross tapered roller bearings can also be selected.