And bearing with the shaft or bearing bore tolerance level and bearing accuracy. P0-level precision bearings with shaft tolerance class generally IT6 bearing hole is generally IT7 and. Rotation accuracy and smooth operation with higher requirements for the occasion (such as electric motors), should be selected axis is IT5 bearing hole for IT6.
The choice of the tolerance zone
The equivalent radial load P is divided into several cases of the "light" and "normal" and "heavy" load, rated with the bearing dynamic load rating C relationship:
≤ 0.12C heavy load, light load P ≤ 0.06C normal load 0.06C <0.12C <P
1) shaft tolerance zone
Shaft tolerances to install the bearings and angular contact bearings with reference to the corresponding tolerance zone table. Most cases, the axis and radial loads in the same direction, that is the occasion of the bearing inner ring relative to the load direction of rotation, generally should be selected transition or interference fit. Stationary axis and radial load the same direction, the bearing inner ring is stationary relative to the load direction occasions, the choice of transition, or a small clearance fit (too big the gap is not allowed).
2) the shell hole tolerance zone
The tolerance of the shell hole to install the bearings and angular contact bearings with reference to the corresponding tolerance zone table. Note should be avoided for the load to swing or rotate the outer ring, the gap with the choice. The equivalent radial load size also affects the outer ring with the choice.
3) bearing structure choice of the form
Rolling bearing of the bearing seat, unless there are special needs, and more generally the overall structure, split bearing is difficult in the assembly, or the advantage of convenience in the assembly to become the main consideration when using, but it can not be applied to the tight fit or more sophisticated co-ordination, such as K7 and with tighter than K7, and if the tolerance class IT6 or more precision bore, shall be split bearing.


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