| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin molding, e.g. a resin gear, or a resin pulley, manufactured by injection molding, which has high precision of the outer circumference of the molding. SOLUTION: The resin molding is molded in an integrated form by injection molding of a resin, and an annular outer circumference part 11 and a shaft part 13 serving as the rotation axis are connected through a web 14. In the web 14, two or more gate marks 16, 16 are arranged circularly so as to surround the shaft part, and, outside the gate marks 16 of the web 14, ribs 15 are erected in the circumferential direction. The ribs 15 have a height at the circumferential position (AG position) corresponding to the gate marks higher than that in the circumferential position (AI position) corresponding to between the gate marks. COPYRIGHT: (C)2011,JPO&INPIT |
