Rotary bearings are machine elements that support rotating shafts accurately while providing low friction conditions. In order to maintain a stable bearing performance over a prolonged duration, appropriate bearing fit design considerations are required to avoid any negative effects ([Chart 1]) that may arise from bearings‘ rotary operation.
[Chart 1] Common Issues & Solutions
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Design Examples of Rotary Bearing Applications
The example seen in [Fig. 1] is based on “Inner race rotation/Outer race retained”.
![[Fig.1] Example - Inner race rotation : Outer race retained (loading in one direction)](https://www.misumi-techcentral.com/tt/en/lca/images/019.gif)
Selection of Bearing Fits Based on Shaft Diameter
Transition fit or interference fit is selected to ensure the shaft and the inner ring will always rotate together.
[Chart 2] Selection Example of Fits (Radial Bearings)
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Selection of Fits For Bearing Holder Bores
Clearance fit should be chosen for ease of assembly while preventing any deformation of bearings‘ outer/inner races. In general, a Clearance fit (H7) is used. In case of light loading applications (H8) can be used, or (G7) when large temperature variations are to be expected.
[Chart 3] Fit Selection Examples For Bores (Radial Bearings)
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