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GB/T 3478.1-2008 English PDF (GBT3478.1-2008)

GB/T 3478.1-2008 English PDF (GBT3478.1-2008)

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GB/T 3478.1-2008: Straight cylindrical involute splines -- Metric module, side fit -- Part 1: Generalities

This part of GB/T 3478 specifies the series of modules, basic tooth profiles, tolerances and side-fit classification for straight cylindrical involute splines. This part is applicable to side-fitting straight cylindrical involute splines of standard pressure angles of 30.
GB/T 3478.1-2008
GB
NATIONAL STANDARD OF THE
PEOPLE 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 Republic
of China;
Standardization Administration of the PEOPLE
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 ... 64
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.
This part is applicable to side-fitting straight cylindrical involute splines of standard pressure angles of 30?? and 37.5?? (modules from 0.5 mm ~ 10 mm), 45?? (modules from 0.25 mm ~ 2.5 mm).
Note. For ease of computer management, 37??30?€? is expressed as 37.5??.
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.
GB/T 1800.1 Geometrical Product Specifications (GPS) - Limits and Fits - Part 1. Bases of Tolerances, Deviations and Fits
GB/T 3478.5 Straight Cylindrical Involute Splines - Metric Module, Side Fit - Part 5. Inspection (GB/T 3478.5-2008, ISO 4156-3.2005, (Straight
Cylindrical Involute Splines - Metric Module, Side Fit - Part 3.
Inspection), MOD)
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).
For the purpose of this part, the following terms and definitions apply. 20 Form diameter, external spline DFe
21 Basic space width E Basic dimension of circular space width on the pitch circle of internal spline, which has a value of half the pitch Actual space width
Maximum actual space width
Minimum actual space width
Emax
Emin
Circular space width, on the pitch circle of internal spline, of any single space
Effective space width
Maximum effective space width
Minimum effective space width
Ev
Ev max
Ev min
Space width, which has a value of the pitch circle circular tooth thickness of an imaginary perfect external spline that fits without clearance or
interference on the entire length of the splined assembly
24 Basic tooth thickness S Basic dimension of circular tooth thickness on the pitch circle of external spline, which has a value of half the pitch Actual tooth thickness
Maximum actual tooth thickness
Minimum actual tooth thickness
Smax
Smin
Circular tooth thickness, on the pitch circle of external spline, of any single tooth
Effective tooth thickness
Maximum effective tooth thickness
Minimum effective tooth thickness
Sv
Sv max
Sv min
Tooth thickness, which has a value of the pitch circle circular space width of an imaginary perfect internal spline that fits without clearance or
interference on the entire length of the splined assembly
27 Effective clearance (full tooth clearance) Cv
Effective space width of the internal spline minus the effective tooth
thickness of the external spline. For looseness, it is positive; for
interference, it is negative.
28 Theoretical clearance (single tooth clearance) C
Actual space width of the internal spline minus the actual tooth thickness of the external spline
29 Form clearance CF Radial distance of the involute tooth form exceeding the spline joint 30 Total tolerance T+?? Machining tolerance plus the deviation allowance 31 Machining tolerance T Permissible deviation of actual space width or actual tooth thickness 32 Deviation allowance ?? Permissible deviation of tooth (space) form and position errors 33 Total pitch deviation Fp
Permissible deviation of maximum absolute value of the difference between the actual and theoretical circular lengths of any two teeth surfaces on the same side of pitch circle
34 Total profile deviation F??
Permissible deviation of the normal distance between two theoretical
profiles covering the actual profile, at the profile working part (including form clearance; excluding tooth crest chamfer)
35 Total helix deviation F??
Permissible deviation of pitch circle arc length between two theoretical teeth traces covering the actual tooth trace, within the spline fit length
The tooth trace refers to the line of intersection between pitch circle cylindrical surface and tooth surface
36 Measurement between two balls or pins, internal MRi
The inside distance between the two measuring pins for measuring the
actual space width...

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