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Information of dimensional data and other requirements given on the drawing for cylindrcal involute gears
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| GB/T 6443-1986 | English | 159 |
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Involute cylindrical gears. Information of the dimensional data to be given on the drawing
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Basic data
| Standard ID | GB/T 6443-2025 (GB/T6443-2025) |
| Description (Translated English) | Information of dimensional data and other requirements given on the drawing for cylindrcal involute gears |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J17 |
| Classification of International Standard | 21.200 |
| Word Count Estimation | 34,391 |
| Date of Issue | 2025-10-31 |
| Date of Implementation | 2026-05-01 |
| Older Standard (superseded by this standard) | GB/T 6443-1986 |
| Issuing agency(ies) | State Administration for Market Regulation and Standardization Administration of China |
GB/T 6443-2025: Information of dimensional data and other requirements given on the drawing for cylindrcal involute gears
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ICS 21.200
CCSJ17
National Standards of the People's Republic of China
Replaces GB/T 6443-1986
The drawing of an involute cylindrical gear should specify...
Size data and other requirements
Published on 2025-10-31
Implemented on May 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction IV
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Drawing annotation 1
5.Table Data 2
6.Partial View 2
7 Technical Requirements 2
8 Special Markings 3
9.Example of drawing annotation 3
Appendix A (Normative) Calculation of the Meshing Line of Involute Cylindrical Gears 5
A.1 External engagement 5
A.2 Internal meshing 12
A.3 Gear and rack meshing 17
Appendix B (Informative) Example of drawing annotations for the design tooth profile and design helix of involute cylindrical gears 20
B.1 Overview 20
B.2 Tooth profile design using the tooth method section 20
B.3 Design of the tooth end section and meshing line of the tooth profile (Figure 21)
B.4 Design of the spiral diagram 23
References 27
Figure 1.Example of drawing annotation 4
Figure A.1 Position of characteristic points on the meshing line of the external meshing gear pair end section when the tooth tip chamfer is ignored.
Figure A.2 Range of tooth profile values for external meshing pinions 9
Figure A.3 Location of characteristic points on the meshing line when considering tooth tip chamfering 10
Figure A.4 Location of characteristic points on the meshing line of an internal meshing gear pair 13
Figure A.5 Calculation range of internal gear tooth profile 16
Figure A.6 Gear and rack meshing 18
Figure B.1 Labeling of the tooth profile diagram of the normal section design when both the tooth tip and tooth root of the pinion are modified 21
Figure B.2 Example 22 of pinion meshing line annotation with modified tooth tips and roots and without considering tooth tip chamfer.
Figure B.3 Example 23 of the annotation of the meshing line of a large gear without modification and without considering the tooth tip chamfer.
Figure B.4 Helix diagram of tooth tip beveling design 24
Figure B.5 Annotation 25 on the symmetrical drum-shaped reshaping diagram.
Figure B.6 Annotation example 25 for helix angle correction and tooth end beveling.
Figure B.7 Design spiral line annotation example 26 for spiral angle correction superimposed with drum-shaped shaping and inverted slope shaping.
Table A.1 Positional characteristics of points A, B, C, D, and E on the meshing line 5
Table A.2 Positional characteristics of points A, B, C, D, and E on the meshing line during deceleration.
Example 21 of numerical labeling in Table B.1 and Figure B.1
Explanation of the numerical labels in Table B.2 and Figure B.2 22
Explanation of the numerical labels in Table B.3 and Figure B.3 23
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document supersedes GB/T 6443-1986 "Dimensional Data to be Involute Cylindrical Gear Drawings" and is consistent with GB/T 6443-1986.
In comparison, aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope has been changed (see Chapter 1, Chapter 1 of the 1986 edition);
b) The "Other" requirement has been removed (see Chapter 3 of the 1986 edition);
c) Added "Partial View" (see Chapter 6);
d) Added "Technical Requirements" (see Chapter 7);
e) Added "Special Markings" (see Chapter 8);
f) The example of drawing annotations has been revised (see Chapter 9, Chapter 4 of the 1986 edition);
g) Added "Calculation of the line of engagement of involute cylindrical gears" (see Appendix A).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the National Technical Committee on Gear Standardization (SAC/TC52).
This document was drafted by. Zhengzhou Machine Tool Research Institute (Zhengzhou) Transmission Technology Co., Ltd., Tianjin Huajian Tianheng Transmission Co., Ltd., and Zhejiang Shuanghuan Transmission Co., Ltd.
Dongfang Machinery Co., Ltd., Shanghai Xinghe Electromechanical Co., Ltd., Zhejiang Xiaxia Precision Manufacturing Co., Ltd., China Academy of Machinery Science and Technology Group Corporation
Zhengzhou Machinery Research Institute Co., Ltd., Guangxi University, Guangdong Jinli Intelligent Transmission Technology Co., Ltd., Chongqing University, Dalian University of Technology
Changsha Haohua Precision Machinery Co., Ltd., Zhejiang Dafeng Gear Co., Ltd., Henan University of Technology, Zhengzhou University of Aeronautics and Astronautics, Zhongyuan University of Technology
College.
The main drafters of this document are. Li Zhaogang, Wang Zhigang, Zhou Zhiqiang, Wang Shilong, Jiang Neng, Xia Ting, Wang Xiaowen, Cao Zhigang, Wang Zhiyuan, and Yang Linjie.
Wang Sibao, Pei Bang, Zhao Ying, Xu Wenbo, Mo Shuai, Shi Lubing, Tang Jun, Fan Ruili, Li Haixia, Li Wan, Xie Guiping, Wang Zhi, Li Wenzheng, Chen Junyan
Xie Dunyuan, Lin Danjing, Guo Qingqing, Guan Hongjie, Zhi Yanfeng, Li Youhua, Yu Feipeng, Shen Huipeng, Wang Xiaopeng, Chen Shengchao.
This document was first published in 1986, and this is its first revision.
Introduction
Involute cylindrical gear drawings serve as the basis for gear design and manufacturing, containing the necessary information for gear part machining and acceptance.
This document outlines the dimensional data and manufacturing requirements. Based on the current state and development of gear design and manufacturing technology, this document specifies the information that should be included on the drawings.
To enrich and improve.
Meshing calculations are the foundation of gear design, and drawing annotations serve as the basis for gear machining and inspection.
Appendix A provides the fundamental theoretical basis for involute gear tooth profile modification, gear strength, and scuff calculations, enriching the theoretical foundation of gear design in my country.
The fundamentals of this work provide guidance for designers and manufacturers of gear transmission devices.
Appendix B provides several examples of annotations for designing tooth profiles and helical modification drawings, which can help gear engineers better understand...
The requirements for involute tooth profile and helix modification are crucial for a more comprehensive and accurate understanding of the marking and inspection of gear design tooth profiles and helices.
method.
The drawing of an involute cylindrical gear should specify...
Size data and other requirements
1 Scope
This document specifies the drawing annotations, tabular data, partial views, technical requirements, and special markings on involute cylindrical gear drawings.
The question is asked, and an example of drawing annotation is provided.
This document applies to the design, machining, and acceptance of involute cylindrical gear parts.
This document is formatted in metric units, but imperial units are also applicable.
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.
GB/T 131 Product Geometric Specification (GPS) - Representation of Surface Structure in Technical Product Documents
GB/T 1182 Product Geometric Specification (GPS) - Geometric Tolerances. Shape, Orientation, Position and Runout Tolerances
GB/T 1800.1 Product Geometric Specification (GPS) - Linear Dimensional Tolerances - ISO Notation System - Part 1.Tolerances, Deviations and
The basis of cooperation
GB/T 1800.2 Product Geometric Specification (GPS) - Linear Dimensional Tolerances - ISO Notation System - Part 2.Standard Tolerance Zones
Codes and Limit Deviation Table for Holes and Shafts
GB/T 3374.1 Gears - Terminology and Definitions - Part 1.Geometric Definitions
GB/T 10095.1-2022 Cylindrical gears - ISO tooth surface tolerance classification system - Part 1.Definition and permissible values of tooth surface deviations
GB/T 10095.2 Cylindrical gears - ISO tooth surface tolerance classification system - Part 2.Definition and permissible values of radial composite deviation
3 Terms and Definitions
The terms and definitions defined in GB/T 3374.1, GB/T 10095.1-2022 and GB/T 10095.2 apply to this document.
4.Drawing annotations
The following (including but not limited to) should be directly labeled in the view of the drawing.
a) Tolerances for the diameter, shape, and position of the tooth tip circle;
b) Pitch circle diameter;
c) Base circle diameter (if necessary);
d) Tooth width and its tolerances;
e) Diameter, shape, and positional tolerances of holes or shafts;
f) Dimensional, shape, and positional tolerances of keyways (if any);
g) Dimensional, shape, and positional tolerances of the datum and locating surfaces;
h) Surface roughness of machined surfaces such as tooth surfaces.
...
