What is bearing preload? Its purpose?

 

Bearing preload is the force that is applied to a bearing by axial adjustment relative to another bearing before a "use" load (external load) is applied, or by the formation of a "negative clearance" (internal preload) between the raceways and the rolling elements in the bearing.

 

The main purposes of bearing preload are as follows:

 

1. Improve the guiding accuracy of the bearing. Shaft guidance accuracyThe shaft supported by the preload bearing has a high guiding accuracy, because the flexing capacity of the shaft under load is limited by the preload. The preload differential bearings have high guiding accuracy and high rigidity, which also maintains an accurate and constant meshing, and the additional dynamic forces are low, resulting in low operating noise and a long service life of the meshing gears.

 

2. Improve rigidity. The stiffness of a bearing is defined as the ratio of the force exerted on the bearing to the amount of elastic deformation of the bearing. In a certain load range, the elastic deformation of the preloaded bearing is smaller than that of the unpreloaded bearing.

 

3. Low noise operation. The smaller the bearing running clearance, the better the guidance of the rolling elements in the no-load zone, and the less noisy the bearing is when it operates.

 

4. Compensation for wear and sink. During operation, the wear and settling of the bearing increases the clearance, but this can be compensated for by preloading. Compensates for wear and settling in operation, as well as extended operating life.

Extend the working life. In some cases, the coupling arrangement with preload can improve operational reliability and extend service life. Because the right amount of preload improves the load distribution of the bearing, it can increase its operating life.

 

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sales@cwlbearing.com

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