ISO 4156-2:2021 真っ直ぐな円筒形のインボリュートスプライン—メトリックモジュール、サイドフィット—パート2：寸法 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 14 Shafts of machinery and accessories.

This second edition cancels and replaces the first edition (ISO 4156-2:2005), which has been technically revised.

The main changes compared to the previous edition are as follows:

• ISO 4156-1 has been changed from dated to undated reference;
• ISO 4156-3 has been dated to refer to the new edition and moved to Bibliography;
• correction of descriptions of D_{ie min} and D_{ii min};
• correction of the title for Table 32.

A list of all parts in the ISO 4156 series can be found on the ISO website.

Introduction

ISO 4156 (all parts) provides the data and indications necessary for the design, manufacture and inspection of straight (non-helical) side-fitting cylindrical involute splines.

Straight cylindrical involute splines manufactured in accordance with ISO 4156 (all parts) are used for clearance, sliding and interference connections of shafts and hubs. They contain all the necessary characteristics for the assembly, transmission of torque, and economic production.

The nominal pressure angles are 30°, 37,5° and 45°. For electronic data processing purposes, the form of expression 37,5° has been adopted instead of 37°30’. ISO 4156 (all parts) establishes a specification based on the following modules:

• for pressure angles of 30° and 37,5° the module increments are:0,5; 0,75; 1; 1,25; 1,5; 1,75; 2; 2,5; 3; 4; 5; 6; 8; 10;
• for pressure angle of 45° the module increments are:0,25; 0,5; 0,75; 1; 1,25; 1,5; 1,75; 2; 2,5

1 Scope

This document specifies geometry and inspection dimensions for the design and manufacture of straight (non-helical) side-fitting cylindrical involute splines.

Limiting dimensions, tolerances, manufacturing errors and their effects on the fit between connecting coaxial spline elements are defined and tabulated. Linear dimensions are expressed in millimetres and angular dimensions in degrees.

The specified diameters for external splines in the geometry tables and the values in the inspection dimension tables are only valid for fundamental deviation “h”.

For fundamental deviations other than “h”, diameters and tooth thicknesses are calculated for external splines according to the formulae in ISO 4156-1 and inspection dimensions according to the formulae in ISO 4156-3.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4156-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography