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DIN ISO 21771:2014

Gears - Cylindrical involute gears and gear pairs - Concepts and geometry (ISO 21771:2007)

This International Standard specifies the geometric concepts and parameters for cylindrical gears with involute helicoid tooth flanks. Flank modifications are included. It also covers the concepts and parameters for cylindrical gear pairs with parallel axes and a constant gear ratio, which consist of cylindrical gears according to it. Gear and mating gear in these gear pairs have the same basic rack tooth profile.

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Deutsches Institut für Normung [din]
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