NBN ISO 6336-2:2021

This document specifies the fundamental formulae for use in the determination of the surface load
capacity of cylindrical gears with involute external or internal teeth. It includes formulae for all
influences on surface durability for which quantitative assessments can be made. It applies primarily
to oil-lubricated transmissions, but can also be used to obtain approximate values for (slow-running)
grease-lubricated transmissions, as long as sufficient lubricant is present in the mesh at all times.
The given formulae are valid for cylindrical gears with tooth profiles in accordance with the basic rack
standardized in ISO 53. They can also be used for teeth conjugate to other basic racks where the actual
transverse contact ratio is less than ean
= 2,5. The results are in good agreement with other methods
(see References [5], [7], [10], [12]).
These formulae cannot be directly applied for the assessment of types of gear tooth surface damage
such as plastic yielding, scratching, scuffing and so on, other than that described in Clause 4.
The load capacity determined by way of the permissible contact stress is called the “surface load
capacity” or “surface durability”.
If this scope does not apply, refer to ISO 6336-1:2019, Clause 4.