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GBZ3480.22-2024: Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity
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Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity
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GB/Z 3480.22-2024
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Basic data | Standard ID | GB/Z 3480.22-2024 (GB/Z3480.22-2024) | | Description (Translated English) | Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity | | Sector / Industry | National Standard | | Classification of Chinese Standard | J17 | | Classification of International Standard | 21.200 | | Word Count Estimation | 42,462 | | Date of Issue | 2024-04-25 | | Date of Implementation | 2024-11-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GBZ3480.22-2024: Calculation of load capacity of spur and helical gears - Part 22: Calculation of micropitting load capacity
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GB /Z 3480:22-2024: Calculation of load capacity of spur and helical gears Part 22: Calculation of load capacity due to micropitting
ICS 21:200
CCSJ17
Guiding technical documents of the People's Republic of China on national standardization
Calculation of load capacity of spur and helical gears
Part 22: Calculation of micropitting load-bearing capacity
(ISO /T S6336-22:2018,IDT)
Released on 2024-04-25
2024-11-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms, definitions, symbols and units 2
3:1 Terms and Definitions 2
3:2 Symbols and units 2
4 Micropitting 5
5 Basic formula 6
5:1 General 6
5:2 Safety factor against micropitting (Sλ) 6
5:3 Local film thickness ratio (λGF,Y) 6
5:4 Allowable film thickness ratio (λGFP) 7
5:5 Recommendations for the minimum safety factor against micropitting (Sλ,min) 8
6 Material parameters (GM) 9
6:1 Overview 9
6:2 Composite elastic modulus (Er) 9
6:3 Compressive-viscosity coefficient at bulk temperature (αθM) 9
7 Local velocity parameter (UY) 10
7:1 Overview 10
7:2 Sum of tangential velocities (v∑,Y) 10
7:3 Dynamic viscosity at bulk temperature (ηθM) 10
8 Local load parameters (WY) 11
8:1 Overview 11
8:2 Local Hertzian contact stress (pdyn,Y,A) obtained by method A 11
8:3 Local Hertzian contact stress (pdyn,Y,B) obtained by method B 12
9 Local sliding parameter (SGF,Y) 12
9:1 Overview 12
9:2 Compressive-viscosity coefficient at local contact temperature (αθB,Y) 13
9:3 Dynamic viscosity at local contact temperature (ηθB,Y) 13
10 Definition of contact point Y on the contact path 14
11 Load sharing factor (XY) 16
11:1 Overview 16
11:2 Spur gears without profile modification 16
11:3 Spur gears with profile modification 17
11:4 Local support factor (Xbut,Y) 19
11:5 Helical gears with εβ≤0:8 and no tooth profile modification 20
11:6 Helical gears with εβ≤0:8 and modified tooth profile 20
11:7 Helical gears with εβ≥1:2 and no tooth profile modification 21
11:8 Helical gears with εβ≥1:2 and modified tooth profile 21
11:9 Helical gears with 0:8< εβ< 1:2 23
12 Local contact temperature (θB,Y) 23
13 Local flash temperature (θfl,Y) 23
14 Body temperature (θM) 24
14:1 Overview 24
14:2 Average friction coefficient (μm) 24
14:3 Load loss factor (Hv) 26
14:4 Tooth tip trim coefficient (XCa) 26
14:5 Lubrication factor (XS) 28
Appendix A (Informative) Calculation of the allowable film thickness ratio for oil products with micropitting test results based on FVA-Information Sheet 54/7 29
Appendix B (Informative) Reference value of λGFP 31
Reference 33
Foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents"
Drafting:
This document is part 22 of GB/T 3480 "Calculation of load capacity of spur and helical gears": GB/T 3480 has published the following
part:
--- Part 1: Basic principles, overview and general influence coefficients;
--- Part 2: Calculation of tooth surface contact strength (pitting);
--- Part 3: Calculation of gear tooth bending strength;
--- Part 4: Calculation of tooth surface fracture load capacity;
--- Part 5: Strength and quality of materials;
--- Part 6: Calculation of service life under variable load conditions;
--- Part 22: Calculation of micropitting load-bearing capacity:
This document is equivalent to ISO /T S6336-22:2018 "Calculation of load capacity of spur and helical gears Part 22: Micropitting load capacity
Capacity Calculation", the document type was adjusted from ISO technical specifications to my country's national standardization guiding technical documents:
The following minimal editorial changes were made to this document:
---Added the mention of formula (3) to formula (5) in the text:
Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:
This document is proposed and coordinated by the National Technical Committee for Gear Standardization (SAC/TC52):
This document was drafted by: Zhengji Institute (Zhengzhou) Transmission Technology Co:, Ltd:, Zhejiang Shuanghuan Transmission Machinery Co:, Ltd:, Chongqing Gearbox
Co:, Ltd:, Northwestern Polytechnical University, Chongqing University, Henan University of Science and Technology, Shaanxi Fast Gear Co:, Ltd:, Nanjing High Speed Gear
Manufacturing Co:, Ltd:, Zhengzhou Machinery Research Institute Co:, Ltd:, Guizhou Qunjian Precision Machinery Co:, Ltd:, Wenling Minghua Gear Co:, Ltd:, Taiyuan
University of Science and Technology, Hunan University, Zhejiang Great Wall Mixing Equipment Co:, Ltd:, Chongqing Nanyan Industrial Group Longjian Machinery Manufacturing Co:, Ltd:, Guangdong
Jinli Intelligent Transmission Technology Co:, Ltd: and Jiangyin Tiancheng Mechanical Equipment Co:, Ltd:
The main drafters of this document are: Wang Wei, Wang Zhigang, Dong Meizhu, Cheng Xiangdong, Zhao Ning, Hou Shengwen, Yu Yong, Liu Huaiju, Li Haixia, Zhang Peng, Xu Wenbo,
Gu Ruijie, Yang Jianjun, He Aimin, Cao Zhigang, Jing Daiyun, Fan Ruili, Guo Qingqing, Zhi Yanfeng, Yan Lingming, Wang Xiaoyi, Yang Zhen, Zhang Lei, Guan Hongjie,
Lubing Shi, Linlin Sun, Boyu Zhang, Bingyang Wei, Hua Zhong, Zhongkui Sun, Pengliang Zhou, Wenliang Wang, Ruiliang Zhang, Changjiang Zhou, Zehua Lu, Liang Wu, Jian He,
Li Dongyang:
Introduction
GB/T (Z) 3480 "Calculation of load capacity of spur gears and helical gears" is widely used in my country's gear industry:
The calculation system of the load-bearing capacity of involute cylindrical gears in my country will help my country's gear products to fully keep pace with international standards:
GB/T (Z) 3480 mainly stipulates the calculation of the load capacity of involute spur gears and helical gears:
The standard is divided into 11 parts, each of which is interrelated and independent, and together constitutes a relatively complete calculation framework:
According to different research objects and calculation methods, GB/T (Z) 3480 is planned to consist of 11 parts:
--- Part 1: Basic principles, overview and general influence factors: The purpose is to establish the load capacity of involute spur gears and helical gears:
The basic principles of force calculation are given, and the values of general influence coefficients and some correction coefficients are given:
--- Part 2: Calculation of tooth surface contact strength (pitting): The purpose is to give the tooth surface contact strength (pitting) based on Hertz contact theory:
The calculation method of erosion) and the values of some correction coefficients:
--- Part 3: Calculation of gear tooth bending strength: The purpose is to give a calculation method for the tooth surface bending strength based on the cantilever beam theory and
The values of some correction coefficients:
--- Part 4: Calculation of tooth surface fracture load capacity: The purpose is to describe a method developed in recent years to assess the risk of tooth surface fracture:
method:
--- Part 5: Strength and quality of materials: The purpose is to give the technical requirements of different material quality grades and the influence of gear tooth surface joints:
The main factors and allowable values of contact strength limit and tooth root bending strength limit:
--- Part 6: Calculation of service life under variable load conditions: The purpose is to give the calculation results of the service life under variable load conditions by Palmgren-Miner
The calculation method of the equivalent value of variable load is based on the law:
--- Part 20: Flash temperature method for calculation of bonding load capacity: The purpose is to describe the maximum contact temperature of the meshing tooth surface and the contact temperature
Variations along the contact path:
--- Part 21: Accumulated temperature method for calculation of bonding load capacity: The purpose is to describe the weighted contact temperature of the meshing tooth surface along the contact path
average value:
--- Part 22: Calculation of micropitting load carrying capacity: The purpose is to describe the minimum oil film thickness model of a specific lubricant in the gear contact area:
Type, in order to evaluate the gear's ability to resist micropitting:
--- Part 30: Calculation examples based on GB/T 3480:1, 2, 3, and 5:
Reference examples for GB/T 3480:2, GB/T 3480:3 and GB/T 3480:5 series standards:
--- Part 31: Calculation example of micropitting load carrying capacity: The purpose is to provide a reference example based on GB /Z 3480:22:
The names of the various parts and their ISO correspondence are shown in Table 1:
Table 1 Parts of the GB/T 3480 series (status as of the publication date of this document)
Calculation of load capacity of spur and helical gears
ISO file types are converted into Chinese standardized file types
ISO ISO /TS ISO /TR GB/T GB /Z
Part 1: Basic principles, overview and general influence coefficients √ √
Part 2: Calculation of tooth surface contact strength (pitting) √ √
Part 3: Calculation of gear tooth bending strength √ √
Part 4: Calculation of tooth surface fracture load capacity √ √
Part 5: Strength and quality of materials √ √
Table 1 Parts of the GB/T 3480 series (status as of the publication date of this document) (continued)
Calculation of load capacity of spur and helical gears
ISO file types are converted into Chinese standardized file types
ISO ISO /TS ISO /TR GB/T GB /Z
Part 6: Calculation of service life under variable load conditions √ √
Part 20: Calculation of the load capacity of glued gears (also applicable to bevel gears
and hypoid gears)---Flash temperature method
(Partially replaces: GB /Z 6413:1-2003)
√ ×
Part 21: Calculation of the load capacity of glued gears (also applicable to bevel gears
and hypoid gears)---Accumulated temperature method
(Partially replaces: GB /Z 6413:2-2003)
√ ×
Part 22: Calculation of micropitting load capacity √ √
Part 30: Application of Parts 1, 2, 3 and 5 of GB/T 3480
Calculation Example
√ ×
Part 31: Calculation example of micropitting load bearing capacity √ ×
Note: “√” indicates that it has been published, and “×” indicates that it has not been published:
Calculation of load capacity of spur and helical gears
Part 22: Calculation of micropitting load-bearing capacity
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 (εαn) 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)
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