NBN ISO 6336-3:2021

This document specifies the fundamental formulae for use in tooth bending stress calculations for
involute external or internal spur and helical gears with a rim thickness sR > 0,5 ht for external gears
and sR > 1,75 mn for internal gears. In service, internal gears can experience failure modes other than
tooth bending fatigue, i.e. fractures starting at the root diameter and progressing radially outward. This
document does not provide adequate safety against failure modes other than tooth bending fatigue. All
load influences on the tooth root stress are included in so far as they are the result of loads transmitted
by the gears and in so far as they can be evaluated quantitatively.
This document includes procedures based on testing and theoretical studies such as those of Hirt[11]
,
Strasser[14]
and Brossmann[10]
. The results are in good agreement with other methods (References [5],
[6], [7] and [12]). The given formulae are valid for spur and helical 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 if the virtual contact ratio ean
is less than 2,5.
The load capacity determined on the basis of permissible bending stress is termed “tooth bending
strength”. The results are in good agreement with other methods for the range, as indicated in the
scope of ISO 6336-1.
If this scope does not apply, refer to ISO 6336-1:2019, Clause 4.