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GB/Z 3480.22-2024Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity (English PDF)

直齿轮和斜齿轮承载能力计算第22部分：微点蚀承载能力计算

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

April 25, 2024

Implementation date

November 1, 2024

Scope

GB/Z 3480.22-2024 is the English-translated version of 直齿轮和斜齿轮承载能力计算第22部分：微点蚀承载能力计算.

GB/Z 3480.22-2024 is the Chinese standard "Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity".

Its scope clause reads: This document describes a method for calculating the micropitting load capacity of external cylindrical gears: The document is based on the test and observation of oil-lubricated gear transmission devices with circular linear speeds of 8m/s~60m/s: Any gear pair with suitable parameters as mentioned above: The formulas in this document are applicable to driving and driven cylindrical gears with tooth profiles conforming to ISO 53 and also to gears with an equivalent contact ratio (epsilonalphan) less than 2:5: Gears that are conjugate with other basic racks: For normal working pressure angles not greater than 25°, pitch circle helix angles not greater than 25° and pitch circle linear speeds When the speed is greater than 2m/s, the calculation results of this document are in good agreement with other methods: This document is not intended for the assessment of tooth surface damage other than micropitting types:.

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Document preview — GB/Z 3480.22-2024

National Standard of the People's Republic of China

ICS: 21.200
Classification: J 17

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and units
4 Micropitting
5 Basic formula
6 Material parameters (GM)
7 Local velocity parameter (UY)
8 Local load parameters (WY)
9 Local sliding parameter (SGF,Y)
10 Definition of contact point Y on the contact path
11 Load sharing factor (XY)
12 Local contact temperature (thetaB,Y)
13 Local flash temperature (thetafl,Y)
14 Body temperature (thetaM)
Appendix B (Informative) Reference value of lambdaGFP

1 Scope

This document describes a method for calculating the micropitting load capacity of external cylindrical gears:

The document is based on the test and observation of oil-lubricated gear transmission devices with circular linear speeds of 8m/s~60m/s:

Any gear pair with suitable parameters as mentioned above:

The formulas in this document are applicable to driving and driven cylindrical gears with tooth profiles conforming to ISO 53 and also to gears with an equivalent contact ratio (epsilonalphan) less than 2:5:

Gears that are conjugate with other basic racks: For normal working pressure angles not greater than 25°, pitch circle helix angles not greater than 25° and pitch circle linear speeds

When the speed is greater than 2m/s, the calculation results of this document are in good agreement with other methods:

This document is not intended for the assessment of tooth surface damage other than micropitting types:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document:

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to

This document:

Note: GB/T 1356-2001 Standard basic rack tooth profile for cylindrical gears for general machinery and heavy machinery (ISO 53:1998, IDT)

Note: GB/T 3374:1-2010 Gear terms and definitions Part 1: Geometric definitions (ISO 1122-1:1998, IDT)

ISO 1328-1 Cylindrical gears - ISO tooth flank tolerance classification system - Part 1: Definitions and permissible values of tooth flank deviations

Note: GB/T 10095:1-2022 Cylindrical gears ISO tooth surface tolerance classification system Part 1: Definition and allowable values of tooth surface deviation (ISO 1328-1:

2013, IDT)

ISO 6336-1 Spur and helical gears - Calculation of load capacity - Part 1: Basic principles, overview and general influence factors (Calcula- ence factors)

Note: GB/T 3480:1-2019 Calculation of load capacity of spur and helical gears Part 1: Basic principles, overview and general influence factors (ISO 6336-1:

2006, IDT)

ISO 6336-2 Calculation of load carrying capacity of spur and helical gears Part 2: Calculation of tooth contact strength (pitting)

Note: GB/T 3480:2-2021 Calculation of load capacity of spur and helical gears Part 2: Calculation of tooth contact strength (pitting) (ISO 6336-2:

2019, IDT)

GB/T 10087 | GB/T 10086 | GB/T 6404.2 | GB/Z 3480.31 | GB/Z 3480.21 | GB/Z 3480.20 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 71 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 53 · ISO 1122 · ISO 1328 · GB/T 10095 · ISO 6336

Cited by

GB/Z 3480.31-2025Calculation of load capacity of spur and helical gears - Part 31: Calculation examples of micropitting load capacity

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