There are actually bearings on all kinds of machinery and equipment. China ball bearing manufacturer has a lot of types and classifications of bearings, but in order to better apply bearings, it is very important to understand its related knowledge. Let's take a look at the bearings. What is the clearance and how to choose it!
Bearing clearance refers to the amount of movement when the bearing is not installed on the shaft or bearing box, and one of the inner or outer rings is fixed, and then the unfixed side moves radially or axially. According to the moving direction, it can be divided into radial clearance and axial clearance. The size of the clearance during operation (called working clearance) has an impact on the rolling fatigue life, temperature rise, noise, vibration and other properties of the bearing. When measuring the bearing clearance, in order to obtain a stable measurement value, a specified measurement load is generally applied to the bearing. Therefore, the obtained measured value is larger than the real clearance (called theoretical clearance), which increases the amount of elastic deformation caused by the measured load. But for roller bearings, since this amount of elastic deformation is small, it can be ignored Excluding. The internal clearance of the bearing before installation is generally expressed as the theoretical clearance.
The amount of expansion or contraction of the ferrule caused by interference fit when the bearing is installed on the shaft or in the housing is subtracted from the theoretical clearance, which is called "installation 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 bearing is installed with the clearance when placed under a certain load on the machine, that is, the effective clearance plus the elastic deformation caused by the bearing load, so as to be called "working clearance". When the working clearance is slightly negative, the bearing The fatigue life is the longest, but the fatigue life decreases significantly with the increase of the negative clearance. Therefore, when selecting the bearing clearance, it is generally advisable to make the working clearance zero or slightly 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., and a specific analysis must be made according to the operating conditions. .
About the content of how to choose the bearing clearance of custom roller bearings manufacturer, the editor has introduced it to you in great detail, I hope it can help you!