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GB/T 44846-2024: Calculation of load capacity for plastic gear
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Calculation of load capacity for plastic gear
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GB/T 44846-2024
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Basic data
| Standard ID | GB/T 44846-2024 (GB/T44846-2024) |
| Description (Translated English) | Calculation of load capacity for plastic gear |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J17 |
| Classification of International Standard | 21.200 |
| Word Count Estimation | 77,786 |
| Date of Issue | 2024-10-26 |
| Date of Implementation | 2025-05-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 44846-2024: Calculation of load capacity for plastic gear
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT44846-2024
ICS 21.200
CCSJ17
National Standard of the People's Republic of China
Calculation of load capacity of plastic gears
Released on October 26, 2024
Implementation on May 1, 2025
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 abbreviations 1
3.1 Terms and Definitions 1
3.2 Symbols and abbreviations 1
4 Calculation of load capacity of parallel axis cylindrical gears 9
4.1 General Principles 9
4.2 Basic parameter calculation 10
4.3 Checking the tooth temperature 11
4.4 Tooth root bending fatigue strength check 13
4.5 Check of tooth surface contact fatigue strength 28
4.6 Friction and wear verification 33
4.7 Peak load verification 35
4.8 Gear tooth deformation check 35
5 Calculation of load capacity of staggered helical gears 36
5.1 General Principles 36
5.2 Characteristic load value verification 36
5.3 Tooth root strength check 39
5.4 Tooth contact fatigue strength check 45
Appendix A (Informative) Material properties and selection of commonly used plastics 49
Appendix B (Informative) Selection of External Lubricants 59
Appendix C (Informative) Transmission Efficiency Estimation 62
Appendix D (Informative) Calculation Example 64
Reference 71
Preface
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.
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 Standardization of Gears (SAC/TC52).
This document was drafted by. Beijing University of Technology, Shenzhen Zhaowei Electromechanical Co., Ltd., Shenzhen Sanduole Intelligent Transmission Co., Ltd.,
Suzhou Xingnuoqi Technology Co., Ltd., Guangdong Desheng Intelligent Technology Co., Ltd., Zhengzhou Machinery Research Institute Co., Ltd., Zhejiang Jiezhong Technology
Co., Ltd., Dongguan Xinghuo Gear Co., Ltd., Dongguan Yujia Precision Hardware and Plastic Products Co., Ltd., Guangdong Jinli Intelligent Transmission Technology Co., Ltd.
Technology Co., Ltd., Ningbo Gree Plastic Industry Co., Ltd., Ningbo Shuanglin Auto Parts Co., Ltd., Zhongshan Yishang Gear Technology Co., Ltd.
Co., Ltd., Zhejiang Jiechang Linear Drive Technology Co., Ltd., Hunan Panco Transmission Technology Co., Ltd., Chongqing University, Zhongshan Xiangshan Transmission
Technology Co., Ltd., Guangdong Ocean University.
The main drafters of this document are. Shi Zhaoyao, Li Qing, Yu Bo, Xin Dong, Wang Zhigang, Yang Dongping, Luo Tingde, Zhou Changjiang, Sun Kun, Liu Huihua,
Tong Aijun, Sun Yongping, Wang Xiaowen, Wang Shifeng, Xu Pingjun, Zhang Guangyan, Han Yinan, Liu Huaiju, Li Ping, Dong Jianjiang, Lu Yongfang, Wang Defeng,
Gu Laifa, Han Chao, Shen Changjian, Gong Zhichao, Ding Hongyu, Li Sheng, Lu Zehua, Xia Ningwei, Li Haixia, and Fan Ruili.
introduction
Since plastic gears are quite different from metal gears in design requirements, manufacturing methods, and application areas, this document is based on the
The material properties, common failure modes, and transmission types of the gears are different (compared to metal gear transmission), with emphasis on the following aspects.
--- Considering that the strength of plastic gears is greatly affected by temperature, the tooth temperature verification method is described, and the calculation method of tooth root and tooth profile temperature is given.
formula;
--- Considering that wear is one of the main failure modes of plastic gears, the friction wear verification method is described, and the wear of some materials is given.
coefficient;
--- Considering the small elastic modulus of engineering plastics and the need to transmit power, a method for checking gear tooth deformation is described;
--- Describes the peak load verification method;
--- Considering that there are many factors affecting the transmission efficiency of plastic gears, the fluctuation range is large, and it has a significant impact on temperature rise, the transmission efficiency estimation is described.
Calculation method, and includes transmission efficiency design;
--- describes the calculation method of the load capacity of staggered helical gears (for steel-plastic paired staggered helical gears, failure is almost only
Limited to plastic gears, verification can be performed using characteristic load values, tooth root strength, and tooth surface contact fatigue);
---The failure modes and causes of plastic gears are given.
Calculation of load capacity of plastic gears
1 Scope
This document describes the calculation method for the load carrying capacity of plastic parallel-axis cylindrical gears and staggered-axis helical gears.
This document is applicable to the design and verification of gears made of semi-crystalline thermoplastic materials, whose basic tooth profile complies with GB/T 1356 or
GB/T 2362, and is.
--- Parallel shaft spur and helical cylindrical gears with a module mn ≥ 0.1 mm; or
--- Module mn ≥ 0.3mm, axis angle Σ ≤ 90° and metal worm (number of heads z1 < 6, worm basic tooth profile conforms to GB/T 10087
or GB/T 10226) paired helical gears.
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.
GB/T 1356 Standard basic rack tooth profiles for cylindrical gears for general and heavy machinery
GB/T 1357 Module of cylindrical gears for general machinery and heavy machinery
GB/T 2362 Basic tooth profile of small module involute cylindrical gears
GB/T 3374.1-2010 Gear terms and definitions Part 1.Geometric definitions
GB/T 3374.2-2011 Gear terms and definitions Part 2.Worm gear geometry definitions
3 Terms, definitions, symbols and abbreviations
3.1 Terms and Definitions
The terms and definitions defined in GB/T 3374.1-2010 and GB/T 3374.2-2011 apply to this document.
3.2 Symbols and abbreviations
The symbols in Table 1 apply to this document.
Table 1 Symbols and units
Symbolic terms or units of description
Af fracture area mm2
AG gearbox heat dissipation area m2
Aτ shear area mm2
AE meshing line length mm
a Center distance mm
ah semi-major axis of the contact ellipse (mm)
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