GB/T 299-2023Rolling bearings—Double-row tapered roller bearings—Boundary dimensions (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".

This document replaces GB/T 299-2008 "Rolling bearings - Double row tapered roller bearings - Boundary dimensions". Compared with GB/T 299-2008, in addition to editorial changes, the main technical changes are as follows:

a) ADD the terms and definitions (see Clause 3);

b) ADD the symbol and values of the contact angle of bearings (see Clause 4, Table 1 to Table 8, Table A.1 to Table A.4);

c) ADD the identification code (see Clause 5);

d) ADD the ISO dimension series code corresponding to the series 22 bearings (see Table 7);

e) ADD the minimum single inner ring back face chamfer dimension rs min of some bearings (see Table A.1 to Table A.4).

1 Scope

This document specifies the boundary dimensions of double-row tapered roller bearings (hereinafter referred to as "bearings") that comply with GB/T 273.1-2023.

This document applies to the design and user selection of double-row tapered roller bearings with double raceway outer rings.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 272 Rolling bearings - Identification code

GB/T 273.1-2023 Rolling bearings - Boundary dimensions general plan - Part 1: Tapered roller bearings

GB/T 274-2023 Rolling bearings - Chamfer dimension - Maximum values

GB/T 6930 Rolling bearings - Vocabulary

3 Terms and definitions

For the purpose of this document, the terms and definitions defined in GB/T 6930 apply.

4 Symbols

The following symbols apply to this document.

Unless otherwise specified, the symbols shown in Figure 1 and the values shown in Tables 1 to 8 and Tables A.1 to A.4 all represent nominal dimensions. B: width of a single inner ring; B1: width of bearing; C2: width of double raceway outer ring;

6 Marking

Double-row tapered roller bearings are marked in the order of "rolling bearing", bearing code and standard number. Example:

A double-row tapered roller bearing, with dimension series 21 and a nominal bore diameter of 180 mm, complying with the provisions of GB/T 299-2023 is marked as: Rolling bearing 352136 GB/T 299-2023

7 Boundary dimensions

The boundary dimensions of bearings shall comply with the provisions of Tables 1 to 8.

The meaning of ISO dimension series code shall comply with the provisions of GB/T 273.1-2023.

The maximum single chamfer dimensions corresponding to rs min and r1s min in Tables 1 to 8 shall comply with the provisions of GB/T 274-2023.

The boundary dimensions of other dimension series bearings specified in GB/T 273.1-2023 shall comply with the provisions of Annex A. […]