Detail of GB/T 25764-2024

Introduction of GB/T 25764-2024

GB/T 25764-2024 Rolling bearings - Roller bearings for automotive transmissions 1 Scope This document specifies the code method, structural type, boundary dimensions, technical requirements, inspection rules, markings, and rustproof packaging for roller bearings used in automotive transmissions, and describes the corresponding testing methods. This document is applicable to the manufacturing of roller bearings (hereinafter referred to as "bearings") for automotive transmissions. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions 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 272-2017 Rolling bearings - Identification code GB/T 274-2023 Rolling bearings - Chamfer dimension - Maximum values GB/T 283-2021 Rolling bearings - Cylindrical roller bearings - Boundary dimensions GB/T 297-2015 Rolling bearings - Tapered roller bearings - Boundary dimensions GB/T 307.1-2017 Rolling bearings - Radial bearings - Geometrical product specification (GPS) and tolerance values GB/T 307.2-2005 Rolling bearings - Measuring and gauging principles and methods GB/T 307.3-2017 Rolling bearings - General technical regulations GB/T 959.1-2017 Specifications for retaining rings - Circlips GB/T 2828.1-2012 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 4199-2003 Rolling bearings - Tolerances - Definitions GB/T 4604.1-2012 Rolling bearings - Internal clearance - Part 1: Radial internal clearance for radial bearings GB/T 6930-2024 Rolling bearings - Vocabulary GB/T 7811-2015 Rolling bearings - Symbols for physical quantities GB/T 8597-2013 Rolling bearings - Rust proof packaging GB/T 24605-2009 Rolling bearings - Marking for products GB/T 24607-2023 Rolling bearings - Test and assessment for life and reliability GB/T 24610.3-2019 Rolling bearings - Measuring methods for vibration - Part 3: Radial spherical and tapered roller bearings with cylindrical bore and outside surface GB/T 24610.4-2019 Rolling bearings - Measuring methods for vibration - Part 4: Radial cylindrical roller bearings with cylindrical bore and outside surface GB/T 25769-2010 Rolling bearings - Measuring methods for radial internal clearance GB/T 28268-2012 Rolling bearings - Specifications of pressed cages GB/T 32333-2015 Rolling bearings - Measuring methods and specifications for vibration (acceleration) GB/T 33624-2017 Rolling bearings - Test and assessment methods for cleanliness GB/T 34891-2017 Rolling bearings - Parts made from high-carbon chromium bearing steels - Specifications for heat treatment JB/T 6641-2017 Rolling bearings - Residual magnetism and its assessment method JB/T 7048-2011 Rolling bearings - Engineering plastic cages - Specification JB/T 7051-2006 Rolling bearing parts - Methods for the measurement and assessment of surface roughness JB/T 7363-2023 Rolling bearings - Parts made from carbonitriding - Specifications for heat-treatment JB/T 8236-2023 Rolling bearings - Internal clearances and adjusting methods for double-row and four-row tapered roller bearings JB/T 8878-2011 Rolling bearings - Drawn cup needle roller bearings - Specifications JB/T 8881-2020 Rolling bearings - Parts made from Carburizing bearing steels - Specifications for heat treatment JB/T 8922-2011 Rolling bearings-Specifications for vibration (velocity) of cylindrical roller bearings JB/T 10236-2014 Rolling bearings - Vibration(velocity) for tapered roller bearings - Specifications JB/T 10237-2014 Rolling bearings - Vibration (acceleration) for tapered roller bearings - Specifications JB/T 10336-2017 Rolling bearings - Additional specifications 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 4199-2003 and GB/T 6930-2024 apply. 4 Symbols For the purposes of this document, the symbols and abbreviations given in GB/T 4199-2003 and GB/T 7811-2015 and the following apply. C1: width of outer ring flange D1: outside diameter of outer ring flange T3: working height of tapered roller bearings with flanged outer rings Note: Refers to the distance between the back of the inner ring on the non-flange side and the inner side of the outer ring flange δ: sag amount of rolling element

Contents of GB/T 25764-2024

Contents Foreword iii 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols 5 Classification 6 Identification codes 6.1 Composition of code 6.2 Type code and size series code 6.3 Precodes and postcodes 6.4 Code example 7 Structural type and boundary dimension 7.1 Cylindrical roller bearings 7.2 Radial tapered roller bearings 8 Technical requirements 8.1 Materials and heat treatment 8.2 Tolerances 8.3 Chamfering 8.4 Rolling surface shape 8.5 Surface roughness 8.6 Clearance 8.7 Residual magnetism 8.8 Cleanliness 8.9 Vibration 8.10 Friction torque 8.11 Rotational flexibility 8.12 Appearance quality 8.13 Service life 8.14 Others 9 Examination method 9.1 Measurement of tolerances 9.2 Inspection of roller sag 9.3 Detection of chamfer 9.4 Measurement of rolling surface shape 9.5 Measurement of surface roughness 9.6 Measurement of clearance 9.7 Measurement of residual magnetism 9.8 Testing of cleanliness 9.9 Measurement of vibration 9.10 Measurement of friction torque 9.11 Check of rotational flexibility 9.12 Appearance quality inspection 9.13 Service life test 10 Inspection rules 10.1 End-of-manufacturing inspection 10.2 Acceptance inspection 10.3 Type inspection 11 Marking 12 Rustproof packaging Annex A (Informative) Technical conditions for shaft and bearing seat and bearing fit Bibliography