scope:

This part of IS0 10300 specifies the fundamental formulae for use in the tooth-bending stress calculation of straight and helical (skew), zerol- and spiral-bevel gears with a minimum rim thickness under the root ≥3,5 m_mn. All load influences on tooth stress are included, insofar as they are the result of load transmitted by the gearing and able to be evaluated quantitatively. (Stresses such as those caused by the shrink-fitting of gear rims, which are superposed on stresses due to tooth loading, are to be taken into consideration in the calculation of the tooth root stress CTF or the permissible tooth root stress OFP.)

The formulae in this pari of IS0 10300 are valid for bevel gears with teeth with a transverse contact ratio of ε_vα<2, while the results are valid within the range of the applied factors given in IS0 10300-1 and IS0 6336-3.

This part of IS0 10300 does not apply to stress levels above those permitted for I0³ cycles, as stresses in that range could exceed the elastic limit of the gear tooth.

CAUTION - The user is cautioned that when the methods are used for large spiral and pressure angles, and for large face width b > 10 m_mn, the calculated results of IS0 10300 should be confirmed by experience.