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ISO/PRF 21771-1

Cylindrical involute gears and gear pairs — Part 1: Concepts and geometry

General information

50.20     Aug 13, 2024

ISO

ISO/TC 60/SC 1

International Standard

21.200  

English  

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Scope

This document specifies the geometric concepts and parameters for cylindrical gears with involute helicoid tooth flanks. Flank modifications are included. The formulas 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.

Life cycle

PREVIOUSLY

Revises
ISO 21771:2007

NOW

IN_DEVELOPMENT
ISO/PRF 21771-1
50.20 Proof sent to secretariat or FDIS ballot initiated: 8 weeks
Aug 13, 2024

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