| 摘要 |
Provided is an internal gear (52) constituted by: a ring-shaped gear part (52a) that includes a tooth flank (521); and a main body part (52b) that includes a shaft support part (523) which supports an output shaft (5a) of a reduction gear, and an outer peripheral part (522) which retains the outer periphery of the gear part (52a). The gear part (52a) is formed with sintered metal, and the main body part (52b) is injection molded using a resin, with the gear part (52a) as an insert component. |
