Flexible meshing type gear device having a high wear-resisting rigid internal gear

摘要

A flexible meshing type gear device 1 has an internal gear 2 having internal teeth 21, a flexible external gear 3 having external teeth 31, and a wave generator 4. Only the internal teeth 21 of the internal gear 2 are formed thereon with a metal plated coating 21a. Further, a tooth profile 211 of the internal teeth 21 of the rigid internal gear 2 before metal plating is modified from a desired tooth profile of the internal teeth so that a tooth profile 212 defined by a surface of the internal teeth 21 after metal plating corresponds substantially to the desired tooth profile of the internal teeth for assuring a proper meshing between the internal and external gears. Accordingly, a flexible meshing type gear device having a high wear resistance can be realized while maintaining a high fatigue strength of the external gear and a proper meshing between gears.