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Norm

ISO 6336-3:2019

Issue date: 2019 11 26

Calculation of load capacity of spur and helical gears — Part 3: Calculation of tooth bending strength (Corrected version 2020-11)

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 thicknes...
Valid
Publisher:
International Organization for Standardization
Format:
Digital | 55 Pages
Language:
English

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.

ISO 6336-3:2019
2019 11 26
Calculation of load capacity of spur and helical gears — Part 3: Calculation of tooth bending streng...
Norm
ISO 6336-3:2006/Cor 1:2008
2008 05 26
Calculation of load capacity of spur and helical gears — Part 3: Calculation of tooth bending streng...
Norm
ISO 6336-3:2006
2006 09 04
Calculation of load capacity of spur and helical gears — Part 3: Calculation of tooth bending streng...
Norm
ISO 6336-3:1996/Cor 1:1999
1999 09 09
Calculation of load capacity of spur and helical gears — Part 3: Calculation of tooth bending streng...
Norm
ISO 6336-3:1996
1996 06 13
Calculation of load capacity of spur and helical gears — Part 3: Calculation of tooth bending streng...
Norm
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