The impact of rotational speed on the lifespan and noise of bearings

The impact of rotational speed on the lifespan and noise of bearings!

Bearing speed is one of the most important factors affecting bearing temperature rise. The maximum allowable speed of the bearing, also known as the limit 

speed, decreases as the diameter and width series of the bearing increase. The bearing sample or design manual lists the maximum allowable speed nlim values 

for various types and sizes of bearings. The test conditions are equivalent dynamic load P<=0.1C (C is the basic rated dynamic load), normal cooling conditions, 

and the maximum allowable speed when the bearing has a 0-level tolerance. However, since the maximum speed is mainly limited by the temperature rise during 

operation, it cannot be assumed that the maximum speed in the sample is an absolute limit that cannot be exceeded.

From the requirements of working speed for bearings, the following points can be determined:

1. Ball bearings have higher ultimate speed and rotational accuracy than roller bearings, so they should be preferred for high-speed applications.

2. Under the same inner diameter, the smaller the outer diameter, the smaller the rolling element, and the centrifugal inertia force exerted by the rolling element on 

the outer raceway during operation is also smaller, making it suitable for working at higher speeds. Therefore, at high speeds, it is advisable to use bearings with 

smaller outer diameters within the same diameter series. If a smaller outer diameter bearing cannot meet the required load-bearing capacity, the same bearing 

can be installed in parallel, or a wide series bearing can be considered.

3. The material and structure of the cage have a significant impact on the bearing speed. Solid retainers allow for higher rotational speeds than stamped retainers, 

while bronze solid retainers allow for higher rotational speeds.