| 摘要 |
PURPOSE:To improve the accuracy of tooth shape and to keep its strength surely in a resin-molded gear. CONSTITUTION:Double ribs 4 are formed at the upper and lower parts of hollow part 3 by providing said hollow part 3 in the part connecting a tooth shape 1 to a boss 2, whereby the deformation of the tooth shape due to the sink in molding or the tension of the reinforcing rib may be prevented, and the improvement of accuracy and the guarantee of strength may be obtained. |
