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ISO 21771:2007
M00006974
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ISO 21771:2007 Gears - Cylindrical involute gears and gear pairs - Concepts and geometry
standard by International Organization for Standardization, 09/01/2007
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ISO 21771:2007 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.