Clearance of rolling bearing

Clearance of rolling bearings

Bearing clearance is bearing and roller bearing clearance between the outer shell.

The clearance of rolling bearings is divided into radial clearance and axial clearance.

Radial clearance: the amount of movement of the other ring from one extreme position to another radial position with respect to the fixed ring when one ring is fixed without load.

Axial clearance: The amount of axial movement of one ring from one extreme position to another with respect to the fixed ring when one ring is stationary in the absence of load.

 The internal clearance of bearings will have a significant impact on the performance of bearings such as service life, vibration, sound and heat, so it is very important to choose the appropriate internal clearance according to the purpose. Deep groove ball bearings are represented by ordinary radial internal clearance. The following table for deep groove ball bearing radial internal clearance. （For miniature bearing for example）

In the actual measurement, in order to obtain a stable measured value, the specified load is added, and the measured value is larger than the actual value, so the real clearance can be obtained after correction. （For miniature bearing for example）

Theoretically, when there is only negative clearance in bearing operation, the service life becomes the longest, but if the negative clearance is slightly larger, the service life will be rapidly reduced. Therefore, in general, the initial clearance is slightly larger than 0. Most micro bearings choose MC3, and general bearings choose C0.