The Meaning of the Preload of Crossed Roller Bearings


What is the preload of crossed roller bearings? Generally, rolling bearings have a certain clearance under working conditions. However, in order to achieve a specific purpose, when the cross roller bearing is assembled, apply a certain internal load through adjustment of the clearance to achieve negative clearance. This method is called preload.

What are the benefits of preload of crossed roller bearings?

1.Improve the Rotation Accuracy

After the bearing is pre-loaded, the internal clearance is eliminated, and each rolling element is subjected to a certain preload, so that the cross roller ring is supported from all directions. Therefore the running accuracy is improved, and the shaft will be positioned correctly in the axial and radial directions.

2. Increase Stiffness

The contract between the rolling element and the raceway is elastic contact. The rolling element can be regarded as a spring. Bearings with clearance are supported by only a few springs in the direction of force. But the pre-loaded cross roller bearings are spring-loaded in all directions and have a certain amount of preload. The number of rolling elements under load is greater than that when there is a clearance, so the stiffness can be improved.

3.Extend Bearings Service Life

After pre-load, the number of cylindrical rollers under load is increased, so the load on each roller is reduced. At the same time, the load can be evenly distributed on each rolling element, so the life of the bearing can be extended.

4.Improve the Bearing’s Damping and Reduce Noise

Preload makes a stable oil film between the rollers and the raceways of crossed roller bearings. This will improve the damping between the rolling elements and the raceways, and can improve the dynamic characteristics of the support structure and reduce noise.

5.Compensate for Wear During Operation

The bearing will increase the clearance due to wear during operation. This situation can be compensated by preload of crossed roller bearings


  • Colette 2020-04-21 at 17:49

    Do u have high precision crossed roller bearing, used in harmonic drive? P2 class?

    • tbbbearing 2020-04-23 at 14:29

      Yes, we have experience upon this field. Our sales department will be in contact with you, Colette

  • Bob Hope 2020-04-26 at 17:18

    Wow, please inform me your range of product size of crossed roller bearing, I am interested of this product.

    • tbbbearing 2020-04-27 at 11:23

      Bob, our cross roller bearing size range from ID 100-2460mm, OD 280-2800mm. May I know which items are you interested in please?

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