What should be paid attention to in bearing inspection

1.Bearing quality

First, check whether there is any bad condition such as deterioration, agglomeration, impurities, etc., which is an important basis for judging the cause of bearing damage.

Secondly, check the bearing for seizure and wear; check the surface finish of the bearing inner and outer rings, rolling elements and cages, as well as cracks, rust, peeling, pits, overheating and other defects, and measure whether the bearing clearance exceeds the standard; check If there is any wear, pits or peeling on the shaft sleeve, the bearing should be replaced with a new one.

2.Bearing fit

When the bearing is installed, the cooperation between the bearing inner diameter and the shaft and the outer diameter and the housing is very important. When the fit is too loose, the mating surface will cause relative sliding, which is called creep.

Once the creep occurs, it will wear the mating surface, damage the shaft or the shell, and the wear powder will invade the inside of the bearing, causing heat, vibration and damage.

When the interference is too large, the outer diameter of the outer ring becomes smaller or the inner diameter of the inner ring becomes larger, reducing the internal clearance of the bearing.

In order to select a bearing suitable for the application, various factors such as the nature, size, temperature conditions of the bearing load, and the rotation of the inner and outer rings must be considered.

3.Adjustment of bearing clearance

If the bearing clearance is too small, the grease will cause the bearing to heat up due to the excessive shear friction loss in the clearance. At the same time, if the clearance is too small, the amount of oil will be reduced, and the heat generated by friction will not be taken away, which will further increase the temperature rise of the bearing. .

However, if the clearance is too large, it will change the dynamic characteristics of the bearing and cause the rotor to run unstable. It is therefore necessary to select a verified bearing clearance for different equipment  and  conditions  use.