Detail of JB/T 5389.1-2005

Introduction of JB/T 5389.1-2005

1. Scope This Part specifies the main structural type, designation method, –boundary dimension and technical specification of four row cylindrical roller bearings for rolling mills (hereafter simply referred to as bearings). This Part is applicable to production, inspection and user design, type selection and acceptance of bearings. 2. Normative References The following normative documents contain provisions which, through reference in this part of JB/T 5389, constitute provisions of this standard. For dated references, subsequent amendments (excluding amending errors in the text) to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative documents referred to applies. GB/T 272-1993 Rolling bearing—Identification code GB/T 307.2-2005 Rolling Bearings - Measuring and Gauging Principles and Methods (ISO 1132-2:2001, Rolling Bearings - Tolerances - Part2: Measuring and Gauging Principles and Methods, MOD) GB/T 3203-1982 Carburizing Bearing - Steel Technical Specification GB/T 4199-2003 Rolling Bearings - Tolerances - Definitions ISO 1132-1:2000, Rolling Bearings-Tolerances - Part1: Terms and Definitions, MOD); GB/T 7811-1999 Rolling Bearings - Symbols for Quantities; GB/T 8597-2003 Rolling Bearings - Rustproof Packaging GB/T 18254-2002 High-carbon Chromium Bearing Steel JB/T 1255-2001 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel JB/T 2974-2004 Rolling Bearings - Identification Code-Supplemental Regulations JB/T 3573-2004 Rolling Bearings-Measurement Method for Radial Clearance JB/T 3574-1997 Rolling Bearings - Product mark JB/T 8881-2001 Rolling Bearing Parts - Carburizing Heat Treatment Technical Specification JB/T 8921-1999 Inspection Rules for Rolling Bearings and Its Commercial Parts 3. Symbols For the purpose of this Part, the following symbols and those given in GB/T 7811 and GB/T 4199 apply. di: the nominal diameter of inner ring raceway Vdisp: the variation of inner ring raceway diameter in a single plane △dis: the diameter deviation of inner ring raceway D1mpmax-D2mpmin: the difference between the maximum mean outside diameter and minimum mean outside diameter of the same bearing outer ring d1pmax-d2mpmin: the difference between the maximum mean inner diameter and minimum mean inner diameter of the same bearing inner ring dimp-dimp': the difference between the average diameter of inner ring raceway both ends E: the nominal width of inner ring raceway Li: the straightness of inner ring raceway r: the nominal chamfer of inner ring r1: the nominal chamfer of outer ring r1smin: the smallest single chamfer dimension of outer ring Sdi: the verticality of inner ring raceway to benchmark end face 4 Main Structural Types See Figure 1~Figure 3. 5 Designation 5.1 Constitution of designation Bearing -desigantion consists of type code, dimension code and Suffix Code, and its arrangement sequence is as follows: Type Code Dimension Code –SuffixCode 5.2 Type Code Type codes consist of Latin capital letters and represent the constructional features of bearings. See Table 1. Table 1 Type Codes

Contents of JB/T 5389.1-2005

Contents Foreword I 1. Scope 2. Normative References 3. Symbols 4 Main Structural Types 5 Designation 5.1 Constitution of Code 5.2 Type Code 5.3 Dimension Code 5.4 Suffix Code 5.5 Mark Example 6. Boundary Dimension 7. Technical Requirements 7.1 Tolerance 7.2 Clearance 7.3 Material and Heat Treatment Others 8. Inspection Methods 9. Inspection Rules 10. Marking, Rustproof and Packaging Appendix A (Normative) Technical Requirements for Commercial Bearing Inner Ring A.1 Structural Type of Inner Ring of Commercial Bearing A.2 Code of Inner Ring of Commercial Bearing A.3 Boundary Dimension of Inner Ring of Commercial Bearings A.4 Tolerance of Inner Ring of Commercial Bearing Appendix B (Normative) Recommended Value of Oil Hole Dimension of Outer Ring B.1 Structural Type of Oil Gallery of Outer Ring B.2 Oil Gallery Dimension of Outer Ring