The pre-tightening of the bearing means that after the bearing is installed on the bearing seat and the shaft, certain measures are taken to cause a certain amount of pre-deformation between the rolling elements in the bearing and the inner and outer rings, so as to keep the inner and outer rings in a tight position. state.

The most important functions of bearing preload include: reducing noise, compensating for wear during operation, improving the accuracy of shaft guidance, improving rigidity, and prolonging working life.

Compensate for wear during operation. The bearing will increase the clearance due to wear during operation. This situation can be compensated by preload. Improve rigidity. The rigidity of a bearing refers to the ratio of the force acting on the bearing to its elastic deformation. Imported bearings that are preloaded have less elastic deformation caused by loads within a certain range than bearings that are not preloaded.

To reduce noise, the smaller the working clearance of the bearing, the better the guidance of the rolling elements in the no-load zone, and the lower the noise of the bearing during operation. Extended working life, in some applications, the preload of the bearing arrangement can improve the reliability of operation and extend the working life. Proper preload can make the load distribution in the bearing more even, so it can have a longer working life.