Method of manufacturing a rigid internal gear of a wave gear device

A method of manufacturing a rigid internal gear of a wave gear device, in which the rigid internal gear comprises a main gear ring and a tooth-forming ring having internal teeth formed on an inner circumferential surface thereof and, in which the tooth-forming ring is disposed inside the main gear body and integrally bonded thereto,

• the method comprising steps of:
• forming the main gear ring from a first material that has a low linear expansion coefficient;
• forming the tooth-forming ring from a second material that has a high linear expansion coefficient;
• and
• pressing the tooth-forming ring into an inside of the main gear ring and diffusion-combining the tooth-forming ring and the main gear ring.

A method of manufacturing a rigid internal gear of a wave gear device, in which the rigid internal gear comprises a main gear ring and a tooth-forming ring having internal teeth formed on an inner circumferential surface thereof and, in which the tooth-forming ring is disposed inside the main gear body and integrally bonded thereto,

• the method comprising steps of:
• adding knurls to an outer circumferential surface of the tooth-forming ring and carving, from tops of the knurls, at least one cutting edge that extends in a circumferential direction;
• and
• pressing the tooth-forming ring into an inside of the main gear ring while having at least one cutting edge formed on the outer circumferential surface of the tooth-forming ring cut an inner circumferential surface of the main gearing so as to integrate the main gear ring and the tooth-forming ring.