NF ISO 6336-3

Le présent document fait partie d'un ensemble de normes sur le calcul de la capacité de charge des roues cylindriques à denture intérieure ou extérieure et à profil en développante de cercle. Il donne les formules à utiliser pour déterminer la capacité de charge à la flexion des dents. Celles-ci tiennent compte des paramètres d'influence agissant sur la résistance à la rupture des dents, quand une évaluation quantitative de ces derniers est possible.

<p>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 <i>s</i>_R &gt; 0,5 <i>h</i>_t for external gears and <i>s</i>_R &gt; 1,75 <i>m</i>_n 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.</p> <p>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 <i>ε_α</i>_n is less than 2,5.</p> <p>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.</p> <p>If this scope does not apply, refer to ISO 6336-1:2019, Clause 4.</p>