Draft
International Standard
ISO/DIS 21771-1
Cylindrical involute gears and gear pairs — Part 1: Concepts and geometry
Reference number
ISO/DIS 21771-1
Edition 2
© ISO 2026
Draft International Standard
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Under development
This Draft International Standard is in the enquiry phase with ISO members.
Will replace ISO 21771-1:2024

ISO/DIS 21771-1

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Abstract

This document specifies the geometric concepts and parameters for cylindrical gears with involute helicoid tooth flanks. Flank modifications are included. The formulae in this document apply to all pressure angles.

It also covers the concepts and parameters for involute cylindrical gear pairs with parallel or crossed axes, and a constant gear ratio. Gear and mating gear in these gear pairs have the same basic rack tooth profile.

General information

  • Status
     : Under development
    Stage
    : Close of voting [40.60]
  • Edition
     : 2
    Number of pages
     : 163
  • Technical Committee :
    ISO/TC 60/SC 1
    ICS :
    21.200 
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Life cycle

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goals

4
Quality Education
9
Industry, Innovation and Infrastructure

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