ISO 4156-1:2021
Straight cylindrical involute splines — Metric module, side fit — Part 1: Generalities
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.
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, subscripts and abbreviated terms
4.1 General symbols
4.2 Subscripts
4.3 Formulae for dimensions and tolerances for all fit classes
5 Concept of side fit splines
6 Effective fit concept
7 Basic rack profiles for spline
8 Spline fit classes
9 Space width and tooth thickness tolerances
9.1 Total tolerance T + λ
9.2 Deviation allowance, λ
9.3 Total pitch deviation, Fp
9.4 Total profile deviation, Fα
9.5 Total helix deviation, Fβ
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
10 Minor and major diameters
10.1 Tolerances
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
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
12.2 Combination of types
12.3 Designation
12.4 Drawing data
Annex A (informative) Drawing data example calculations
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, subscripts and abbreviated terms
4.1 General symbols
4.2 Subscripts
4.3 Formulae for dimensions and tolerances for all fit classes
5 Concept of side fit splines
6 Effective fit concept
7 Basic rack profiles for spline
8 Spline fit classes
9 Space width and tooth thickness tolerances
9.1 Total tolerance T + λ
9.2 Deviation allowance, λ
9.3 Total pitch deviation, Fp
9.4 Total profile deviation, Fα
9.5 Total helix deviation, Fβ
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
10 Minor and major diameters
10.1 Tolerances
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
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
12.2 Combination of types
12.3 Designation
12.4 Drawing data
Annex A (informative) Drawing data example calculations
Bibliography