Why is the transition fit between the bearing and the shaft?

The inner ring of the bearing usually rotates together with the shaft, which prevents the mating surface of the inner ring and the journal from sliding relative to each other and causes wear and affects the working performance of the bearing, thus requiring a certain interference between the mating surfaces.
Since the inner and outer rings of the bearing are thin-walled parts, if the interference is too large, it is easy to deform.
So adopt a transitional fit.

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