ISO/TS 6336-2:2019, Calculation of load capacity of spur and helical gears — Part 2: Calculation of surface durability (pitting)

SCOPE: 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 εαn = 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.

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This document was prepared by Technical Committee ISO/TC 60, Gears, Subcommittee SC 2, Gear capacity calculation.

This third edition cancels and replaces the second edition (ISO 6336-2:2006), which has been technically revised. It also incorporates the Technical Corrigendum ISO 6336-2:2006/Cor.1:2008.

The main changes compared to the previous edition are as follows:

• modification of the helix angle factor Zβ;
• integration of 13.3.3 "Surface-hardened steel pinion with ductile iron gear".

A list of all parts in the ISO 6336 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www .iso .org/ members .html.

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