GB/T 11365-2019Bevel gears - ISO system of accuracy (English PDF)
锥齿轮 精度制
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
October 18, 2019
Implementation date
May 1, 2020
Scope
GB/T 11365-2019 is the English-translated version of 锥齿轮 精度制.
GB/T 11365-2019 is the Chinese standard "Bevel gears - ISO system of accuracy". Its scope clause reads: This standard specifies the accuracy terminology, grade and tolerance values for unassembled bevel gears, hypoid gears and their components.
Tooth profile Terminology, hierarchy, and allowable values for precision. This standard provides a uniform tolerance scale for both the supply and demand sides, and defines 10 accuracy levels.
From level 2 to level 11, the accuracy is reduced step by step. The tolerance calculation formula for gear accuracy and its applicable range are specified in 5.4.
The scope of application of these formulas is as follows. 1.0mm<=mmn<=50mm 5<=z<=400 5mm<=dT<=2500mm among them. Mmn---midpoint normal modulus; z --- number of teeth; dT --- Tolerance reference diameter.
The measurement methods recommended by this standard are described in Chapter 6. The tolerance value is calculated according to the specific size of the bevel gear and is not given in the form of a data table.
Out. However, for the sake of clarity, Appendix A gives a table and illustrations of partial tolerance values.
This standard does not apply to reducers, speed increasers, gear motors, shaft-mounted reducers, high-speed transmissions and other applications according to a given power, speed, transmission A closed gear unit that is manufactured in comparison to the application environment.
The design of the bevel gear is not limited to the scope of this standard. Determining the accuracy level of the gear that meets the requirements of the working conditions requires a wealth of expertise Work experience.
Note. The design tolerance of a single gear cannot directly correspond to the accuracy of the gear pair assembly. Gear tolerances outside the scope of this standard shall be determined based on actual operating conditions.
This may require additional tolerance settings, unlike this standard The calculation of the quasi-middle formula. Its clauses include terms and definitions, symbols.
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Document preview — GB/T 11365-2019
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
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 terms and definitions, symbol
- 3.1 Terms and Definitions
- 3.2 Basic terms and symbols
- 4 Application of precision level system
- 4.1 Overview
- 4.2 accuracy level
- 4.3 Tolerance direction
- 4.4 Additional Features
- 5 tolerance
- 5.1 Tolerance value
- 5.2 Grading factor
- 5.3 Rounding rule
- 5.4 Tolerance Formula
- 6 Use of measurement methods
- 6.1 Measurement method
- 6.2 Recommended Measurement Control Method
- 6.3 Filtering of measurement data
- 6.4 Tooth contact speckle inspection
- Appendix A (informative) tolerance example table
- Appendix B (informative) Single-sided meshing integrated measurement method
- Appendix C (informative) Accuracy of small modulus bevel gears
- Appendix D (informative) Comprehensive data description
1 Scope
This standard specifies the accuracy terminology, grade and tolerance values for unassembled bevel gears, hypoid gears and their components. Tooth profile
Terminology, hierarchy, and allowable values for precision.
This standard provides a uniform tolerance scale for both the supply and demand sides, and defines 10 accuracy levels. From level 2 to level 11, the accuracy is reduced step by step.
The tolerance calculation formula for gear accuracy and its applicable range are specified in 5.4. The scope of application of these formulas is as follows.
1.0mm<=mmn<=50mm
5<=z<=400
5mm<=dT<=2500mm among them.
Mmn---midpoint normal modulus;
z --- number of teeth;
dT --- Tolerance reference diameter.
The measurement methods recommended by this standard are described in Chapter 6. The tolerance value is calculated according to the specific size of the bevel gear and is not given in the form of a data table.
Out. However, for the sake of clarity, Appendix A gives a table and illustrations of partial tolerance values.
This standard does not apply to reducers, speed increasers, gear motors, shaft-mounted reducers, high-speed transmissions and other applications according to a given power, speed, transmission
A closed gear unit that is manufactured in comparison to the application environment.
The design of the bevel gear is not limited to the scope of this standard. Determining the accuracy level of the gear that meets the requirements of the working conditions requires a wealth of expertise
Work experience. Note. The design tolerance of a single gear cannot directly correspond to the accuracy of the gear pair assembly.
Gear tolerances outside the scope of this standard shall be determined based on actual operating conditions. This may require additional tolerance settings, unlike this standard
The calculation of the quasi-middle formula.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 3374.1-2010 Gear terms and definitions Part 1. Geometric definitions (ISO 1122-1.1998, IDT)
ISO 23509 Bevel Gear and Hypoid Gear Geometry (Bevelandhypoidgeargeometry)
3 terms and definitions, symbols
The following terms and definitions as defined in GB/T 3374.1-2010 and ISO 23509 apply to this document.
Some symbols and terminology contained in this standard may be different from other documents or standards. Users should understand the standard symbols used by themselves.
The meaning of numbers, terms, and definitions.
3.1 Terms and definitions
3.1.1 Index deviation
FX GB/T 10095.2 | GB/T 10095.1 | GB/T 10088 | GB/T 10224 | GB/T 11366 | […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 51 pages — is available in the English PDF.
Referenced standards
Normative references
ISO 1122 · ISO 23509
Cited by
- GB/T 10225-2025Accuracy of fine-pitch bevel gears
- GB/T 12371-2025Bevel gears - Information of the dimensional data to be given on the drawing
- GB/Z 18620.6-2025Code of inspection practice - Part 6: Bevel gear measurement methods
- GB/T 39745-2021CNC punching and laser cutting composite machines
- CJ/T 536-2019Adjustable weir-gate
- JB/T 3192.2-2019Spiral bevel gear milling machines - Part 2: Testing of the accuracy
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