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GB/T 38192-2019Injection molding plastic cylindrical gears tolerance classification system - Definitions and allowable values of deviations relevant to flanks of gear teeth and double flank radial composite test (English PDF)

注射成型塑料圆柱齿轮精度制轮齿同侧齿面偏差和径向综合偏差的定义和允许值

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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 38192-2019 is the English-translated version of 注射成型塑料圆柱齿轮精度制轮齿同侧齿面偏差和径向综合偏差的定义和允许值.

GB/T 38192-2019 is the Chinese standard "Injection molding plastic cylindrical gears tolerance classification system - Definitions and allowable values of deviations relevant to flanks of gear teeth and double flank radial composite test".

Its scope clause reads: This standard stipulates the deviation of the same side tooth surface and the radial comprehensive deviation of the injection molded plastic cylindrical gear (referred to as "injection gear" or "gear").

Poor terminology, precision architecture, and allowable values. This standard applies only to the deviation elements of a single gear, not to the gear pair. This standard specifies nine tolerance levels, from 4 to 12, depending on the characteristics of the precision of the injection molded gear.

5.3 tolerance metering Calculate the formula. These tolerances can be applied to the following ranges. 5<=z<=1000 0.5mm<=d<=280mm 0.1mm<=mn<=3.5mm 0.2mm<=b<=40mm beta<=45° among them. z --- number of teeth; d --- indexing circle diameter; Mn --- normal modulus; b --- tooth width (axial); beta --- helix angle.

This standard does not include the design and surface structure of the gears. Its clauses include terms, definitions and symbols.

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Document preview — GB/T 38192-2019

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

Foreword
1 Scope
2 Normative references
3 terms, definitions and symbols
3.1 Basic terms and symbols
3.2 General parameters
3.3 pitch deviation
3.4 tooth profile deviation
3.5 Helix deviation
3.6 Radial comprehensive deviation
4 Gear precision system application
4.1 Overview
4.2 Geometric deviations to be detected
4.3 Error Characteristics and Measurements
4.4 Gear Tolerance Requirements Specification
4.5 Acceptance and assessment criteria
5 tolerance value
5.1 Overview
5.2 Use of calculations
5.3 Tolerance calculation formula
5.4 Gear Tolerance Value
Appendix A (Normative) Allowable values for radial runout
Appendix B (informative) Single-sided meshing integrated measurement
Appendix C (informative) Measurement of radial comprehensive deviation
Appendix D (informative) Injection molding micro plastic gear image inspection
Appendix E (informative) tolerance table

1 Scope

This standard stipulates the deviation of the same side tooth surface and the radial comprehensive deviation of the injection molded plastic cylindrical gear (referred to as "injection gear" or "gear").

Poor terminology, precision architecture, and allowable values.

This standard applies only to the deviation elements of a single gear, not to the gear pair.

This standard specifies nine tolerance levels, from 4 to 12, depending on the characteristics of the precision of the injection molded gear. 5.3 tolerance metering

Calculate the formula. These tolerances can be applied to the following ranges.

5<=z<=1000

0.5mm<=d<=280mm

0.1mm<=mn<=3.5mm

0.2mm<=b<=40mm

beta<=45° among them.

z --- number of teeth;

d --- indexing circle diameter;

Mn --- normal modulus;

b --- tooth width (axial);

beta --- helix angle.

This standard does not include the design and surface structure of the gears.

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 Gear terms and definitions Part 1. Geometric definition

GB /Z 18620.1 GB /Z 18620.1 Specification for the inspection of cylindrical gears - Part 1

GB /Z 18620.2 Specification for the implementation of cylindrical gears - Part 2. Radial total deviation, radial runout, tooth thickness and backlash test

GB/T 24762-2009 Product Geometry Specifications (GPS) Image measuring instrument acceptance test and retest detection

3 terms, definitions and symbols

The following terms, definitions and symbols defined in GB/T 3374.1 apply to this document.

3.1 Basic terms and symbols

Some terms are defined as shown in Figure 1.

GB/T 40731 | GB/T 40729 | GB/T 35089 | GB/T 10225 | GB/T 10224 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 98 pages — is available in the English PDF.

Referenced standards

Normative references

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