| 摘要 |
PURPOSE:To provide an inner gear which facilitates the structures of a mold for injection molding and a driving mechanism, driving control and so on, and a mold for injection molding which injection-molds the inner gear. CONSTITUTION:This inner gear is formed from a mold for injection molding provided with inner slide cores which moves in the diametrical direction and opens and closes an inner mold, whereas the number Z of teeth of an inner tooth 13 in a cam ring 11 is set with an equation Z=(n/2)S, where n: positive integer, based on the total number S of the first and second inner slide cores 31, 41. |
