Ceramic bearing clearance standard

 

Ceramic bearings offer several benefits over traditional steel bearings, making them popular choices in various applications, particularly those that demand high performance.

 

Ceramic bearings come in many variations, typically full ceramic bearings, ceramic with PEEK or PTFE cages, and hybrid ceramic. Hybrid ceramic bearings consist of ceramic and stainless steel components. Ceramic materials that are frequently used are Zirconia (ZrO2) and Si3N4 (Silicon Nitride) or otherwise recognised as black ceramic bearings.

 

The clearance standard of ceramic bearings is the same as that of ordinary bearings, which is mainly divided into radial clearance and axial clearance. Radial clearance refers to the amount of movement of the other ring relative to the fixed ring from one extreme position to the other extreme position in the radial direction when there is no load; Axial clearance refers to the amount of movement of the other ring from one extreme position to another relative to the fixed ring from one extreme position to another when there is no load.

 

The clearance standard of ceramic bearings is the same as that of ordinary bearings, and the selection of clearance mainly considers the following aspects:

 

Influence of fit: the fit between the inner ring of the bearing and the shaft, and the fit between the outer ring and the bore of the housing will affect the size of the clearance. An interference fit causes the clearance to decrease, while a gap fit increases the clearance.

 

Effect of temperature: The bearing generates heat during operation, which causes the internal temperature to rise, which in turn causes the shaft, housing and bearing parts to expand, which also affects the size of the clearance.

 

Effect of load: When the bearing is subjected to load, it will produce elastic deformation, which will affect the size of the clearance.

 

The specific clearance standard can be determined by consulting the relevant national standards or the technical information provided by the manufacturer. For example, C0 indicates the standard clearance, and C2, C3, C4, C5, etc., indicate a clearance grade that is slightly smaller or larger than the standard clearance.

 

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