Draft
International StandardISO/DIS 21771-2.2
Cylindrical involute gears and gear pairs — Part 2: Calculation and measurement of tooth thickness and backlash
Reference number
ISO/DIS 21771-2.2
ISO/DIS 21771-2.2
Edition 1
© ISO 2025
Proyecto Norma internacional
ISO/DIS 21771-2.2
78378
Este borrador de Norma Internacional se encuentra en la fase de consultas con los miembros de ISO.
Resumen
This standard establishes the calculation procedures for determining specification limits for external and
internal cylindrical involute gearing with constant gear ratio when the desired tooth thickness is known.
This standard also shows the relationships between backlash and the tooth thickness, centre distance,
and tooth deviations in a pinion and gear mesh.