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ISO/DIS 21771-1

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

General information

40.00     Dec 14, 2022

ISO

ISO/TC 60/SC 1

International Standard

21.200  

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/DIS 21771-1
40.00 DIS registered
Dec 14, 2022

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