GB/T 3478.1-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3478.1-2008 | English | 145 |
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Straight cylindrical involute splines -- Metric module, side fit -- Part 1: Generalities
| Valid |
| GB/T 3478.1-1995 | English | RFQ |
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11 days
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Straight cylindrical involute splines--Modules, basic rack profiles and tolerances
| Obsolete |
| GB 3478.1-1983 | English | RFQ |
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11 days
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Straight cylindrical involute splines (Side fit)--Modules, basic rack profiles and tolerances
| Obsolete |
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GB/T 3478.1-2008: Straight cylindrical involute splines -- Metric module, side fit -- Part 1: Generalities
---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/GBT3478.1-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.120.30
J 18
Replacing GB/T 3478.1-1995
Straight Cylindrical Involute Splines –
Metric Module, Side Fit – Part 1.Generalities
(ISO 4156-1.2005, MOD)
Issued on. SEPTEMBER 22, 2008
Implemented on. MAY 1, 2009
Jointly issued by. General Administration of Quality Supervision,
Inspection and Quarantine of the People’s Republic
of China;
Standardization Administration of the People’s
Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Basic Parameters... 9
5 Basic Tooth Profiles... 10
6 Dimension Series... 12
7 Tolerance Classes... 21
8 Tolerances... 21
9 Side Fit... 62
10 Effective Dimensions and Actual Dimensions... 63
11 Inspection Methods... 66
12 Parameter Annotation... 69
13 Calculation Examples... 70
Appendix A (Normative) Conditions and Requirements for Application of
Straight Tooth Form for Internal Spline... 71
Appendix B (Informative) Radial Runout Tolerance of Tooth Ring... 76
Appendix C (Informative) Calculation Examples of Spline... 77
Foreword
GB/T 3478, under the general title "Straight Cylindrical Involute Spline - Metric Module,
Side Fit", consists of the following parts.
- Part 1.Generalities;
- Part 2.30° Pressure Angle Dimensions Tables;
- Part 3.37.5° Pressure Angle Dimensions Tables;
- Part 4.45° Pressure Angle Dimensions Tables;
- Part 5.Inspection;
- Part 6.30° Pressure Angle M and W Values;
- Part 7.37.5° Pressure Angle M and W Values;
- Part 8.45° Pressure Angle M and W Values;
- Part 9.Measuring Pin.
This part is Part 1 of GB/T 3478.
This part modifies and adopts ISO 4156.1.2005 "Straight Cylindrical Involute Splines -
Metric Module, Side Fit - Part 1.Generalities". The main differences are as follows.
- The terms and definitions were presented in a table, for the convenience of use;
- The figures for side fit were deleted; and figures for involute spline joints were
added;
- Theoretical analysis figures for profile error, tooth alignment error and total error
of tooth pitch were deleted; and tables for specific tolerance numbers were added;
- Single item inspection method was added;
- Appendix A “Conditions and Requirements for Application of Linear Tooth Form for
Internal Spline” and Appendix B “Radial Runout Tolerance of Tooth Ring” were
added.
This part is a revision to GB/T 3478.1-1995 “Straight Cylindrical Involute Splines-
Modules, Basic Rack Profiles and Tolerances". The main differences are as follows.
- The standard title was changed from "Straight Cylindrical Involute Splines -
Modules, Basic Rack Profiles and Tolerances" into "Straight Cylindrical Involute
Splines - Metric Module, Side Fit - Part 1.Generalities";
- The mistakes in the former standard were corrected; and editorial modifications
were made according to GB/T 1.1;
- Figure 5 and Appendix C "Calculation Examples of Spline" were added.
Appendix A of this part is normative; Appendix B and Appendix C are informative.
This part was proposed by and shall be under the jurisdiction of National Technical
Committee on Shafts for Machinery and Accessories of Standardization Administration
of China.
Drafting organizations of this part. China Productivity Center for Machinery, Harbin
Dongan Automotive Engine Manufacturing Co., Ltd., Shijiazhuang Sprocket General
Factory, China National Erzhong Group Company, and Taiyuan Heavy Industry Co.,
Ltd.
Chief drafting staff of this part. Ming Cuixin, Chang Baoyin, Xu Wenjiang, Tan Renwan,
Wang Xiaoling, and Deng Gaojian.
The previous editions replaced by this part are.
- GB 3478.1-83 and GB/T 3478.1-1995.
Straight Cylindrical Involute Splines –
Metric Module, Side Fit – Part 1.Generalities
1 Scope
This part of GB/T 3478 specifies the series of modules, basic tooth profiles, tolerances
and side-fit classification for straight cylindrical involute splines.
2 Normative References
The following documents contain provisions which, through reference in this part of
GB/T 3478, constitute provisions of this Part. For dated reference, subsequent
amendments (excluding corrigendum) or revisions of these publications do not apply.
However, parties who enter into agreements based on this standard are encouraged
to investigate the possibility of applying the most recent editions of the standards
indicated below. For any undated references, the latest edition of the document
referred to applies.
3 Terms and Definitions
See Table 1 and Figure 1 for the terms and definitions applied in this part (for 30°
pressure angle flat root, hereinafter it is referred to as 30° flat root; for 30° pressure
angle fillet root, it is referred to as 30° fillet root; for 37.5° pressure angle fillet root, it is
referred to as 37.5° fillet root; for 45° pressure angle fillet root, it is referred to as 45°
fillet root).
4 Basic Parameters
a For comparison, the size of spline tooth is provided - standard pressure angle αD is 30°; number of teeth is 30; and
ratio is 1.1 with different modules.
5 Basic Tooth Profiles
a) 30° Flat Root
b) 30° Fillet Root
c) 37.5° Fillet Root
6 Dimension Series
Calculation formulae of spline dimensions are shown in Table 3.
7 Tolerance Classes
This part specifies four tolerance classes - Classes 4, 5, 6 and 7.
8 Tolerances
The calculation formulae for the total tolerances of space width and tooth thickness are
as follows (unit. μm).
The machining tolerance is derived from the difference between the tolerance (T+λ)
and the deviation allowance λ, i.e. (T+λ)-λ.
9 Side Fit
In connection of involute spline, the spline side is provided with functions of both
driving and self-centering, which shall be considered during structure design.
If any coaxial error in terms of installation reference of internal and external splines,
the effective clearance of spline pair will be reduced or the effective interference will
be increased. Therefore, methods such as adjusting the type of side fit may be adopted
for compensation, if necessary.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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