Calculation of load capacity of bevel gears — Part 30: ISO rating system for bevel and hypoid gears — Sample calculations

This document provides sample calculations for the load capacity of different bevel gear designs, determined according to the methods and formulae of the ISO 10300 series. The initial geometric gear data necessary for these calculations are according to ISO?23509.

The term “bevel gear” is used to mean straight, helical (skew), spiral bevel, zerol and hypoid gear designs. Where this document pertains to one or more, but not all, the specific forms are identified.

The manufacturing process of forming the desired tooth form is not intended to imply any specific process, but rather to be general in nature and applicable to all calculation methods of the ISO?10300?series. The fact that there are bevel gear designs with tapered teeth and others where the tooth depth remains constant along the facewidth (uniform depth) does not require to apply Method B2 for the first and Method B1 for the second tooth configuration.

The rating system of the ISO?10300?series is based on virtual cylindrical gears and restricted to bevel gears whose virtual cylindrical gears have transverse contact ratios of e_va?<?2. Additionally, the given relations are valid for bevel gears of which the sum of profile shift coefficients of pinion and wheel is zero (see ISO?23509).

WARNING????????? The user is cautioned that when the formulae are used for large average mean spiral angles, (?_m1 + ?_m2)/2?>?45°, for effective pressure angles, a_e?>?30° and/or for large facewidths, b?>?13?m_mn, to confirm the calculated results of the ISO?10300?series by experience.

Edition	2024
Standard Part No	30
Published Date	2024
Published By	International Standardization Organisation/Technical Reference
Page Count	362

ISO/TR

ISO/TR 22126-2:2025

ISO/TR 25221:2025

ISO/TR 33402:2025

ISO/TR 19560:2025

ISO/TR 18961:2025

ISO/TR 24464:2025

ISO/TR 24332:2025

ISO/TR 24188:2025

ISO/TR 18965:2025

ISO/TR 5863:2025

ISO/TR 23975:2025

ISO/TR 10300-30:2024