What is bearing preload?

I n simple terms, bearing preload is to apply a certain pressure to the bearing when it is installed. This pressure is to make the bearing more stable and more accurate during operation. In general, bearing preload can be achieved by mechanical adjustment or spring device. So, why carry out bearing preload?

1. Improve rotation accuracy: Many precision machinery, such as CNC machine tools, medical equipment, etc., have very high rotation accuracy requirements. Proper preloading can effectively reduce the internal clearance of the bearing, thereby improving the overall rotation accuracy.

2. Extend the service life: the bearing with preload treatment can disperse the load, reduce friction and reduce wear, thus extending the service life of the bearing. In other words, save money and work.

3. Reduce noise and vibration: Pre-tightening can effectively reduce unnecessary vibration and noise, so that the equipment runs more smoothly. This is especially important for devices that require quiet operation.

Although bearing preloading has many benefits, it is not the more pressure the better. Excessive pressure will cause bearing deformation and affect the performance of the equipment. Similarly, the pressure is too small to play a pre-tightening effect, resulting in a larger gap. Therefore, the preload force needs professional calculation and debugging.

With proper bearing preloading, you can greatly improve the performance and life of mechanical equipment. Different preloading methods also need to be selected according to specific application scenarios.