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What Is Bearing Load - Ball And Roller Bearing

- Dec 08, 2018 -

What is Bearing load - Ball and roller bearing

Bearing load, meaning the load that the bearing is subjected to during use, with lateral and longitudinal loads, etc.


The bearing is in use to support the rotating shaft. The shaft may be subjected to radial or axial loads. These loads will act on the bearing, such as the helical gear shaft on the gear unit. There will be axial load during the transmission. When produced, the bearing will be subjected to axial load.

Bearing axial load 

First understand the definition and difference of the axial and radial directions of the shaft. The axial direction refers to the axial direction of the shaft, and the radial direction is perpendicular to the radial direction of the shaft. Therefore, the axial load of the bearing refers to the load generated in the axial direction of the bearing. Popularly speaking, it is the force that pushes the inner ring of the bearing out of the outer ring. The order of bearing type according to the ability to withstand axial load from small to large is: cylindrical roller bearing <ball bearing <tapered roller bearing < end bearing. Among them, the cylindrical roller bearing is completely unaffected by the axial load, and the end bearing is specially subjected to the axial load.

Deep groove ball bearing

The theory of deep groove ball bearings is not affected by axial force, but it will be slightly axially applied during the actual application, because it has a certain aligning effect. After the axial force disappears, it will return to the original position. The size of the ball bearing is related to the actual working environment. The force of the ball bearing after the axial force is equivalent to the contact angle, which becomes similar to the angular contact ball bearing. This axial force is also related to the clearance of the bearing itself. The ditch radius has a great relationship. In particular, the clearance, the larger the clearance, the greater the range of movement of the steel ball in the axial position, that is, the larger the axial clearance, the greater the axial force that can be withstood, but the clearance cannot be blindly large. In short, I can tell you that this axial force is much smaller than the radial force. As for the specific calculation, because the contact angle is unpredictable, there is no way to know.

Rated static load 

The load capacity of the bearing at rest is determined by the amount of plastic deformation allowed. Plastic deformation in rolling bearings is unavoidable. If the amount of plastic deformation allowed is small, the static load capacity of the bearing is also small; if the allowable plastic deformation is large, the pits generated on the raceway will increase the noise and vibration of the bearing during operation, and the running accuracy Reduced, affecting the normal operation of the bearing.


Long-term bearing experience shows that in rolling bearings, the total plastic deformation (rolling plastic deformation plus rolling body plastic deformation) is less than one ten thousandth of the diameter of the rolling element at the point of contact between the rolling element and the raceway where the load is greatest. It does not have much impact on the normal operation of imported bearings. The bearing static load capacity determined under such plastic deformation conditions is called the rated static load and is generally expressed by C0.


The rated static load is determined under the assumed load conditions. For the radial bearing, the rated static load refers to the radial load, and the radial thrust bearing (angular contact ball bearing) refers to the load that causes the half ring raceway in the bearing to be loaded. The radial component of the thrust bearing refers to the central axial load.



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