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BS ISO 4156-1:2021 – TC

BS ISO 4156-1:2021 – TC

$280.87

Tracked Changes. Straight cylindrical involute splines. Metric module, side fit – Generalities

Published By Publication Date Number of Pages
BSI 2021 180
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This document provides the data and indications necessary for the design and manufacture of straight (non-helical) side-fitting cylindrical involute splines.

Limiting dimensions, tolerances, manufacturing deviations and their effects on the fit between connecting coaxial spline elements are defined in the formulae and given in the tables. Unless otherwise specified, linear dimensions are expressed in millimetres and angular dimensions in degrees.

PDF Catalog

PDF Pages PDF Title
1 compares BS ISO 4156‑1:2021
2 TRACKED CHANGES
Text example 1 — indicates added text (in green)
3 National foreword
Compliance with a British Standard does not of itselfcannot confer immunity from legal obligations.
4 Amendments/corrigenda issued since publication
5 Straight cylindrical involute splines — Metric module, side fit —
Part 1:
Generalities
6 COPYRIGHT PROTECTED DOCUMENT
8 Foreword
10 Introduction
11 Straight cylindrical involute splines — Metric module, side fit —
1 Scope
2 Normative references
3 Terms and definitions
3.1
3.2
12 3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.10
3.11
3.12
3.13
13 3.14
3.15
3.16
3.18
3.23
14 3.263.20
3.273.21
3.283.22
3.293.23
3.303.24
15 3.31
3.333.26
3.343.27
3.353.28
16 Figure 1 — Helix deviations
17 3.373.30
3.38
3.403.32
3.413.33
3.423.34
3.433.35
3.43.13.36
3.43.23.37
18 3.443.38
4 Symbols, subscripts and abbreviated terms
4.1 General symbols
22 4.2 Subscripts
23 4.3 Formulae for dimensions and tolerances for all fit classes
Table 1 — Formulae for dimensions and tolerances for all fit classes
27 5 Concept of side fit splines
a) Clockwise rotation b) Anticlockwise rotation
Figure 2 — Side fit tooth flank contact
28 Figure 3 — Centring force
29 Figure 4 — Space width and tooth thickness
Figure 5 — Diameters
32 Figure 7 — Form deviations
34 Figure 8 — Profile deviation
36 Figure 9 — Pitch deviation
38 Figure 10 — Helix deviation
40 Figure 11 — Influence of individual form deviations
42 Figure 12 — True effective space width and tooth thickness
44 Figure 13 — Actual and effective tolerances
46 Figure 14 — Graphical display of space width and tooth thickness theoretical tolerance zones
48 Figure 15 — Basic rack profile
Table 2 — Dimensions of basic rack
49 Figure 16 — Types of fit
Table 3 — Graphical representation of fundamental deviations for spline fit classes
50 Table 4 — Effective interference and effective looseness of spline fit classes
51 Table 6 — Total space width and tooth thickness tolerance (T+λ)
52 9.2 Deviation allowance, λ
9.3 Total pitch deviation, Fp
53 Table 7 — Total pitch deviation
9.4 Total profile deviation, Fα
Table 8 — Total profile deviation
55 Figure 17 — Profile deviations
9.5 Total helix deviation, Fβ
Table 9 — Total helix deviation
56 9.6 Machining tolerance, T
9.7 Effective clearance tolerance, Tv
9.8 Use of effective and actual dimensions for space width and tooth thickness
9.8.1 Minimum material
9.8.2 Maximum material (minimum effective clearance)
9.8.3 Maximum effective clearance
57 Figure 18 — Graphical display of space width and tooth thickness tolerance zones according to inspection methods
58 10.1 Tolerances
Table 11 — Tolerances for minor diameter internal spline, Dii
59 10.2 Adjustment to minor diameters (Die), form diameters (DFe) and major diameters (Dee) of external splines
11 Manufacturing and design considerations
11.1 Radii
Table 12 — Minimum root radius of internal or external splines
11.2 Profile shifts
60 11.3 Eccentricity and misalignment
11.3.1 Eccentricity
11.3.2 Misalignment
11.3.3 Major and minor diameters
61 12 Spline data
12.1 Basic dimensions
12.2 Combination of types
12.3 Designation
Mating: INT/EXT 24z × 2,5m × 30R × 5H/5f ISO 4156
62 12.4 Drawing data
Figure 19 — Internal and external spline drawing dimensions
63 Table 13 — Spline terms and symbols
68 A.1 General
A.2 INT 25z × 1,0 m × 30P × 5H – ISO 4156
72 A.3 INT 25z × 1,0 m × 30R × 7H – ISO 4156
77 A.4 EXT 25z × 1,0 m × 30P × 4h – ISO 4156
84 A.5 EXT 25z × 1,0 m × 30R × 6e – ISO 4156
91 A.6 EXT 25z × 1,0 m × 30P × 5js – ISO 4156
98 A.7 Deviation allowances λ
Table A.1 — Deviation allowances λ — Modules 0,25 to 1
100 Table A.2 — Deviation allowances λ — Modules 1,25 to 2
102 Table A.3 — Deviation allowance λ — Modules 2,5 to 5
105 Table A.4 — Deviation allowances λ — Modules 6 to 10
108 Bibliography
110 undefined
114 Foreword
116 Introduction
117 1 Scope
2 Normative references
3 Terms and definitions
121 4 Symbols, subscripts and abbreviated terms
4.1 General symbols
124 4.2 Subscripts
4.3 Formulae for dimensions and tolerances for all fit classes
127 5 Concept of side fit splines
129 6 Effective fit concept
138 7 Basic rack profiles for spline
139 8 Spline fit classes
142 9 Space width and tooth thickness tolerances
9.1 Total tolerance T + λ
143 9.2 Deviation allowance, λ
9.3 Total pitch deviation, Fp
9.4 Total profile deviation, Fα
144 9.5 Total helix deviation, Fβ
145 9.6 Machining tolerance, T
9.7 Effective clearance tolerance, Tv
9.8 Use of effective and actual dimensions for space width and tooth thickness
9.8.1 Minimum material
9.8.2 Maximum material (minimum effective clearance)
9.8.3 Maximum effective clearance
147 10 Minor and major diameters
10.1 Tolerances
148 10.2 Adjustment to minor diameters (Die), form diameters (DFe) and major diameters (Dee) of external splines
11 Manufacturing and design considerations
11.1 Radii
11.2 Profile shifts
149 11.3 Eccentricity and misalignment
11.3.1 Eccentricity
11.3.2 Misalignment
11.3.3 Major and minor diameters
12 Spline data
12.1 Basic dimensions
150 12.2 Combination of types
12.3 Designation
12.4 Drawing data
152 Annex A (informative) Drawing data example calculations
178 Bibliography

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BS ISO 4156-1:2021 - TC
$280.87