Wave gear device having an internal gear which is diffusion bonded to an inner bearing ring

摘要

A wave gear device has a rigid internal gear (2), a flexible external gear (3), a wave generator (4), and a cross roller bearing (5) for supporting the gears in a relatively rotatable manner. A toroidal composite member (61) that functions as the rigid internal gear as well as the inner ring of the cross roller bearing comprises an inner ring-forming member (61) that functions as the inner ring, and an internal teeth-forming member that functions as the rigid internal gear, wherein the internal teeth-forming member (62) composed of a ductile casting is integrated by diffusion bonding with the inner ring-forming member (61) composed of bearing steel.