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GB/T 12370-2025: Bevel and hypoid gears - Terminology
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GB/T 12370-1990	English	1599	Add to Cart	7 days [Need to translate]	Terminology for bevel and hypoid gears

GB/T 12370-2025: Bevel and hypoid gears - Terminology

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ICS 21.200 CCSJ17 National Standards of the People's Republic of China Replaces GB/T 12370-1990 Bevel gears and hypoid gears terminology 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 1.Scope 1 2 Normative References 1 3.Kinematics and Geometry 1 3.1 Kinematics 1 3.2 Gear characteristics 3 3.3 Geometry 5 3.4 Meshing and Displacement 6 4.Classification of bevel gears and hypoid gears 8. 4.1 Based on the relationship between the gear's shape and its axis 8 4.2 According to the shape of the tooth line 10 4.3 Gear tooth shrinkage 13 4.4 Tooth height shrinkage 13 5 points, curves and surfaces 15 5.1 Vertices and Intersections 15 5.2 Circle 17 5.3 Curved Surface 18 6.Basic Dimensions 20 6.1 Cone spacing 20 6.2 Diameter 22 6.3 Tooth height 22 6.4 Tooth pitch, tooth thickness, and tooth width 24 6.5 Other linear parameters 26 6.6 Cone angle 27° 6.7 Other angular parameters 30 7 Design and Adjustment Calculations 33 7.1 Length 33 7.2 Angle 36 7.3 Other 38 8.Processing methods and equipment, gear tooth contact, inspection and testing 42 8.1 Processing methods and equipment 42 8.2 Gear tooth contact 45 8.3 Inspection and Testing 49 Reference 51 Index 52

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 replaces GB/T 12370-1990 "Terminology for Bevel Gears and Hypoid Gears". Compared with GB/T 12370-1990, except for... Aside from structural adjustments and editorial changes, the main technical changes are as follows. a) Added the terms and definitions for "tooth line", "tooth surface overlap", "axial overlap", and "actual overlap" (see 3.1.8, 3.4.5, 3.4.4,...). 3.4.6, 3.4.10); b) Modified the following. "Figure-8 meshing bevel gear tooth profile", "Figure-8 meshing crown gear", "Figure-8 meshing production gear", "Production gear", "Forward turning tooth surface", and "Reverse turning tooth surface". The terms "tooth surface", "spherical involute", "total contact ratio", "end face contact ratio", "high displacement bevel gear pair", and "angular displacement bevel gear pair" are used to describe this relationship. Definitions (see 3.1.4–3.1.7, 3.2.5, 3.2.6, 3.3.2, 3.4.2, 3.4.3, 3.4.7, 3.4.8; 3.1.4–3.1.7 in the.1990 edition). 3.2.5, 3.2.6, 3.3.2, 3.4.8, 3.4.9, 3.4.11, 3.4.12); c) The following terms have been deleted. "tooth surface", "total action arc", "end face action arc", "longitudinal action arc", "total action angle", "end face action angle", and "longitudinal action arc". Use the terms and definitions of "angle" and "longitudinal overlap" (see 3.1.8, 3.4.2~3.4.7, 3.4.10 of the.1990 edition); d) The term and definition of "standard shrinkage" have been added (see 4.4.1); e) The terminology and definition of “bevel gear pair” have been changed (see 4.1.2,.1990 edition 4.1.2); f) The following terms have been deleted. "quasi-hypoid gears," "end-face gears," "cylindrical gear end-face gear pairs," "orthogonal bevel gears," and "equal-diameter orthogonal bevel gears." The terminology and definition of “oblique bevel gears” (see sections 4.1.4, 4.1.7, 4.1.8, 4.1.10, 4.1.11, and 4.1.13 in the.1990 edition); g) The titles of sections 4.3 and 4.4 were changed, and the classification method was changed to "tooth shrinkage" and "tooth height shrinkage" (see 4.3, 4.4,.1990). Versions 4.3 and 4.4); h) Added "[tooth surface] midpoint" (see 5.1.6); i) The term and definition of "intermediate cone (middle cone)" have been removed (see 5.3.7 of the.1990 edition); j) Figures 61 and 64 have been revised (see 6.6.3 and 6.6.6,.1990 editions of 6.6.3 and 6.6.6); k) The term and definition of "nominal pressure angle" have been added (see 6.7.2); l) The terms and definitions of "pressure angle," "large-end helix angle," and "small-end helix angle" have been deleted (see 6.7.2, 6.7.5, and 6.7.6 of the.1990 edition); m) The following parameters have been removed. "Gear Taper", "Normal Taper", "Natural Taper", "Reverse Taper", "Double Taper", "Axial Tool Position", and "Axial Face Tool Inclination". The terms and definitions of "face cutter angle", "small gear tooth root angle cutter angle", and "large gear tooth root angle cutter angle" (see 7.1.1~7.1.5 of the.1990 edition) are as follows. 7.2.7, 7.3.7~7.3.10); n) The following methods have been removed. "Single cutterhead method," "Double spiral method," "Supplementary indexing," "Supplementary infeed," "Uniform rolling," and "Straight bevel gear broaching method." Terms and definitions for "oscillating pinion cone method", "press quenching", "rolling quenching", "offset test", "offset diagram", and "offset calculation card" (See 8.1.5, 8.1.7, 8.1.16~8.1.18, 8.1.20, 8.1.22, 8.1.25, 8.1.26, 8.3.2~8.3.4 in the.1990 edition). 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 No.1 Machine Tool Co., Ltd. of China General Technology Group, and Xi'an Laser Technology Co., Ltd. Shooting Transmission Technology Co., Ltd., Henan University of Science and Technology, Zhejiang Fengli Intelligent Technology Co., Ltd., Zhengzhou Machinery Research Institute of China Academy of Machinery Science and Technology Research Institute Co., Ltd., Northwestern Polytechnical University, Zhongshan Mairet CNC Technology Co., Ltd., Jinhua Xintian Gear Co., Ltd., China Coal Zhangjiakou Coal Mine Machinery Co., Ltd., Chongqing University, Dalian University of Technology, Chinese Mechanical Engineering Society, Zhejiang Tongli Transmission Technology Co., Ltd. China General Technology Group Machine Tool Engineering Research Institute (Tianjin) Co., Ltd., Chang'an University, Henan University of Technology, Luoyang Yuege Intelligent Equipment Co., Ltd. Yancheng Jingangxing Precision Forging Co., Ltd., Zhengzhou University of Aeronautics and Astronautics. The main drafters of this document are. Shi Lubing, Fan Ruili, Hou Likang, Zhao Ning, Wei Bingyang, Wang Zhigang, Wang Youli, Cao Zhigang, Guo Hui, and Li Haixia. Xu Wenbo, Wang Junyi, Yuan Junrui, Luo Jianqin, Xiang Chunjian, Yang Bin, Chai Baolian, Song Chaosheng, Xie Hongzhang, Li Kaiyang, Guo Qingqing, Wang Zhi, Sun Linlin Geng Longlong, Xing Kan, Wang Haiwei, Lin Xin, Yan Yaolong, Jiang Jinke, Yu Jijing, Xu Ke, Shen Huipeng, Guan Hongjie, Zhi Yanfeng, Wang Xiaopeng, Liu Xiangdong Li Simin, Yu Feipeng, Deng Jing, Zhang Xudong, Miao Weiwei. This document was first published in.1990, and this is its first revision. Bevel gears and hypoid gears terminology

1 Scope

This document defines the common terminology and definitions for bevel gears and quasi-hyperboloid gears, including kinematics and geometry, bevel gears and quasi-hyperboloids. Gear classification, points, curves and surfaces, basic dimensional parameters, design and adjustment calculations, machining methods and equipment, gear tooth contact, inspection and testing, etc. the term. This document applies to technical documents and work communications involving bevel gears and hypoid gears. Note. Unless otherwise specified, "bevel gear" in this document refers to "bevel gears and hypoid gears".

2 Normative references

This document does not contain any normative references. 3.Kinematics and Geometry 3.1 Kinematics 3.1.1 A gear pair whose two axes intersect. Note. See Figure 1. Figure 1 3.1.2 A gear pair whose two axes are neither parallel nor intersecting. Note. See Figure 2. ...