| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a rigid internal gear having high hardness precisely and simply. SOLUTION: A rigid internal gear 2 of a wave gear device is manufactured as follows. A first annular member 11 and a second annular member 12 are prepared, gear cutting machining is applied on an inner peripheral face of the first annular member 11 to form an internal tooth 11c, and then surface hardening treatment is applied to the first annular member 11A on which the internal tooth is formed. Next, the first annular member 11B on which the surface hardening treatment is applied is fitted into a hollow part 12a of the second annular member 12, and the first and second annular members are integrated to obtain the rigid internal gear 2. Since gear cutting machining of the internal tooth is applied before the surface hardening treatment, the gear cutting machining becomes easy. Since the deformation of the first annular member 11 caused by the surface hardening treatment is corrected by fitting-in of the second annular member 12, highly precise rigid internal gear can be obtained.
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