| 摘要 |
PROBLEM TO BE SOLVED: To enhance coming-off strength of a resin made gear to an annular body, with respect to a gear box containing a resin made gear for transmitting torque between the box and an external device on the outer diameter side of a metal annular body. SOLUTION: The resin made gear 9 is integrally formed on the outer periphery of the metal annular body 82. While a annular protuberance 85 is provided on the outer periphery of the annular body 82, protrusions and recesses 86 are provided to the outer periphery of the annular protuberance 85. The resin made gear 9 is formed, so as to cover the outer periphery of the annular protuberance 85 of the annular body 82 and both side surfaces in the axial center direction. By so doing, catching in the axial center direction of the resin made gear 9 to the annular body 82 is strengthened, which leads to improvement in the slip-off strength to the axial load.
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