GB/T 3480.2-2021 Active

This part of GB/T 3480 specifies the basic calculation formulas for the bearing capacity of gear surfaces of external and internal meshing involute cylindrical gears, including the calculation formulas for all influence coefficients in the evaluation of gear surface contact fatigue strength. The content of this part is mainly applicable to oil-lubricated transmission devices; however, as long as there is sufficient lubricant during the meshing process, it can also be approximately applied to grease-lubricated transmission devices (when operating at low speeds). The formulas given in this part are applicable to the gear profiles of cylindrical gears processed by basic gear-type tools in GB/T 1356, and can also be used for the end face coincidence εαn of equivalent gears (calculated gears) that is less than 2.5 and is congruent with other basic gears. The results calculated using the formulas in this part are very consistent with other methods (see references, , , ). Except for the damage types described in Chapter 4, this part cannot be directly used to evaluate other types of gear surface damage, such as plastic yielding, scratching, or sticking. The bearing capacity determined by the allowable contact stress is called "gear surface bearing capacity" or "gear surface contact strength". If this scope is not applicable, refer to Chapter 4 of ISO 63361:2019.