The outer diameter surface of this kind of bearing is directly used as a roll, so the outer ring wall thickness is much thicker than the general bearing, the bearing bears a large load, and a plurality of bearings are assembled on a shaft for use, and the bearing is required to have a very high accuracy (P4 grade or higher), especially in the same group of bearings, the radial runout of the outer ring and the wall thickness of the bearing section must be controlled within a very small range.
The structural forms of backing bearing include cylindrical roller bearings, tapered roller bearings and needle roller bearings, and the structural form of cylindrical roller bearings is used in most occasions.
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