Draft
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.
Revises
ISO 21771:2007
IN_DEVELOPMENT
ISO/PRF 21771-1
50.20
Proof sent to secretariat or FDIS ballot initiated: 8 weeks
13 gush 2024
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