Calculation of load capacity of bevel gears - Part 20: Calculation of scuffing load capacity - Flash temperature method

ISO/TS 10300-20:2021

ISO/TS 10300-20:2021


This document and the other parts of ISO 10300 series provide a coherent system of procedures for the calculation of the load capacity of bevel and hypoid gears. ISO 10300 series is designed to facilitate the application of future knowledge and developments, also the exchange of information gained from experience.



This document provides a calculation method for bevel and hypoid gears regarding scuffing based on experimental and theoretical investigation. This calculation method is a flash temperature method.

The formulae in this document are intended to establish uniformly acceptable methods for calculating scuffing resistance of straight, helical (skew), spiral bevel, Zerol and hypoid gears made of steel. They are applicable equally to tapered depth and uniform depth teeth. Hereinafter, the term “bevel gear” refers to all of these gear types; if not the case, the specific forms are identified.

A calculation method of the scuffing load capacity of bevel and hypoid gears based on an integral temperature method is not available when this document is published.

The formulae in this document are based on virtual cylindrical gears and restricted to bevel gears whose virtual cylindrical gears have transverse contact ratios of ε < 2. The results are valid within the range of the applied factors as specified in ISO 10300-1 (see ISO 6336-2). 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, (βm1 + βm2) / 2 > 45°, for effective pressure angles, αe > 30° and/or for large face widths, b > 13 mmn, the calculated results of the ISO 10300 series should be confirmed by experience.

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