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ISO 21771-1:2024

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

General information

Valid from 24.10.2024
ICS Groups
21.200 Gears
Directives or regulations
None

Standard history

Status
Date
Type
Name
24.10.2024
Main
28.08.2007
Main
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.

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