Precautions for Rolling Bearing Clearance on Different Situation

Bearing clearance refers to the amount of movement when the bearing is not installed on the shaft or bearing housing, and one side of the inner ring or outer ring is fixed, and then the unfixed side is moved radially or axially. According to the moving direction, it can be divided into radial clearance and axial clearance. The clearance of the bearing is very important for the use of the rolling bearing, there are positive clearance, zero clearance and negative clearance. Since the bearing clearance is so important, we must pay attention to the following points when using the bearing.

1. When the rolling bearing is running, this is called the working clearance. The size of the clearance at this time has an impact on the rotation, bearing life, temperature, noise, vibration and other properties of the bearing, which is very important.

2. When measuring the clearance of the bearing, in order to obtain a more accurate measurement value, the inspector will apply the specified load to the bearing. Therefore, the resulting measured value is larger than the theoretical clearance due to the elastic deformation. However, due to the small amount of elastic deformation, it can be ignored.

3. The internal clearance measured before the bearing is installed is generally referred to as the theoretical clearance. The clearance after subtracting the expansion or contraction of the ring due to interference fit when the bearing is installed on the shaft or in the housing is called "installation clearance" from the theoretical clearance. The clearance obtained by adding and subtracting the dimensional variation due to the temperature difference inside the bearing from the mounting clearance is called "effective clearance". The clearance when the bearing is installed on the mechanical equipment under a certain load is the effective clearance, plus the amount of elastic deformation caused by the bearing load, so it is called "working clearance".

4. When the working clearance is negative, the fatigue life of the bearing is long, but the fatigue life decreases significantly with the increase of the negative clearance. Therefore, when selecting the bearing clearance, it is generally appropriate to make the working clearance zero or positive. In addition, when the rigidity of the bearing needs to be improved or the noise needs to be reduced, the working clearance should take a further negative value, and when the bearing temperature rises sharply, the working clearance should take a further positive value, etc.

The clearance value under different circumstances is different, and it is necessary to make a specific analysis according to the conditions of use. Luoyang FV bearing, welcome your consultation.