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Basic dimensions and tolerance requirements for tapered roller bearings

The precision design of tapered roller bearing mainly includes the dimensional accuracy, shape and position tolerance, surface roughness and so on.

1. Tolerance level

Tapered roller bearings are classified into five grades according to the tolerance and rotation accuracy of the basic dimensions of their inner and outer rings: their names and codes from lowest to highest are ordinary /PO, advanced /P6/P6x, precision /P5, ultra-precision /P4 and most precision /P2(GB/T272-1993). For ordinary grade bearings, the tolerance grade code (GB307.3-1984) is generally not marked on the bearing type.

2. Tolerance zone

● The tolerance zone of any size is determined by two factors: the width of the tolerance zone and the position of the tolerance zone, and the tolerance zone of tapered roller bearings is no exception.

● The characteristics of bearing inner and outer diameter tolerance belts are: all tolerance belts are unidirectional offset below the zero line, that is, the upper deviation is 0, the lower deviation is negative.

3. Basic size and tolerance requirements of tapered roller bearings

1) Basic size: The basic size of tapered roller bearings refers to the inner diameter d, outer diameter D and bearing width B of tapered roller bearings.

2) Matching size of bearings: Because the inner and outer rings of bearings are thin-walled structures, they are easy to be deformed during manufacturing and storage, but can be corrected after assembly. Some deformation is allowed for ease of manufacture.

In order to ensure the fit nature of bearings and binding parts, only the average diameter of inner and outer rings in their single plane is limited, that is, the fit size of bearings.

3) Size manufacturing tolerance: the national standard has two kinds of provisions on the bearing inner diameter and outer diameter size tolerance. One is to specify the allowable deviation of the maximum and minimum of the inner and outer diameter size, namely, the single inner and outer diameter deviation, whose purpose is to limit the amount of deformation; Second, the average deviation of the maximum and minimum values of the actual size of the inner and outer diameter is specified, that is, the average deviation of the inner and outer diameter of a single plane, which is used for the matching of bearings. Both should conform to national standards.

4) The rotation accuracy of tapered roller bearings: refers to the radial runout tolerance of the inner and outer rings of bearings; The end face run-out tolerance of the inner and outer ring of the bearing is the end face of the inner hole axis.


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