GB/Z 3480.21-2025Calculation of load capacity of spur and helical gears - Part 21: Calculation of scuffing load capacity - Integral temperature method (English PDF)
直齿轮和斜齿轮承载能力计算 第21部分：胶合承载能力计算 积温法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 3, 2025
Implementation date
December 3, 2025
Scope
GB/Z 3480.21-2025 is the English-translated version of 直齿轮和斜齿轮承载能力计算 第21部分：胶合承载能力计算 积温法.
GB/Z 3480.21-2025 is the Chinese standard "Calculation of load capacity of spur and helical gears - Part 21: Calculation of scuffing load capacity - Integral temperature method".
Its scope clause reads: This document describes in detail the accumulated temperature method for calculating the scuffing capacity of cylindrical gears. Its clauses include terms and definitions, symbols and units.
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Document preview — GB/Z 3480.21-2025
National Standard of the People's Republic of China
- ICS
- 21.200
- Classification
- J 17
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- Introduction
- 1.Scope
- 2 Normative References
- 3.Terms and Definitions, Symbols and Units
- 3.1 Terms and Definitions
- 3.2 Symbols and Units
- 4.Scope of Application 5.
- 4.1 Overview
- 4.2 Adhesion damage
- 4.3 Accumulated Temperature Criterion
- 5 Impact Factor
- 5.1 Average coefficient of friction µmC
- 5.2 Running-in coefficient (XE)
- 5.3 Thermal flash coefficient (XM)
- 5.4 Pressure Angle Coefficient (Xalphabeta)
- 6.Calculate
- 6.1 Cylindrical Gear
- 6.2 Accumulated temperature of adhesive bonding.
- Appendix A (Informative) Example
- Appendix B (Informative) Adhesion Temperature Related to Contact Time
- References
1 Scope
This document describes in detail the accumulated temperature method for calculating the scuffing capacity of cylindrical gears.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
Note. GB/T 1356-2001 Standard basic rack tooth profile for cylindrical gears for general and heavy machinery (idtISO 53.1998)
ISO 1122-2 Gears - Terms and definitions - Part 2.Definitions of worm gear geometry
Note. GB/T 3374.2-2011 Gear terminology and definitions - Part 2.Definition of worm gear geometry (ISO 1122-2.1999, IDT)
ISO 1328-1 Cylindrical gears - ISO tooth surface tolerance classification system - Part 1.Definition and permissible values of tooth surface deviations (Cylindrical)
Note. GB/T 10095.1-2022 Cylindrical gears - ISO tooth surface tolerance classification system - Part 1.Definition and permissible values of tooth surface deviations (ISO 1328-1.
2013, IDT)
3 Terms and definitions, symbols and units
3.1 Terms and Definitions
The terms and definitions defined in ISO 1122-2 apply to this document.
3.2 Symbols and Units
The symbols used in this document are shown in Table 2.
Table 2 Symbols and Units
Symbolic description of units a Center distance (mm)
BM thermal contact coefficient N/(mm·s1/2·K) b. Tooth width, take the smaller value between the small and large gears (mm).
Weighting coefficients C1, C2, C2H -
Ca Nominal tooth tip trimming amount (µm) […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 35 pages — is available in the English PDF.
Referenced standards
Normative references
ISO 1122-2 · ISO 1328-1
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Related Standards
GB/Z 3480.22-2024 — Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity
GB/Z 3480.20-2025 — Calculation of load capacity of spur and helical gears - Part 20: Calculation of scuffing load capacity - Flash temperature method
GB/Z 3480.31-2025 — Calculation of load capacity of spur and helical gears - Part 31: Calculation examples of micropitting load capacity
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