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ISO 21771-1:2024

Cylindrical involute gears and gear pairs — Part 1: Concepts and geometry ISO 21771-1:2024

Publication date:   Oct 24, 2024

General information

60.60 Standard published   Oct 24, 2024

ISO

ISO/TC 60/SC 1 Nomenclature and wormgearing

International Standard

21.200   Gears

Buying

Published

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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 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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 21771:2007

NOW

PUBLISHED
ISO 21771-1:2024
60.60 Standard published
Oct 24, 2024