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
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
