| 摘要 |
PROBLEM TO BE SOLVED: To enhance the stiffness of a resinous gear by arranging a rib, and beside, prevent occurrence of speed fluctuation by the rib. SOLUTION: This gear 14 is provided with a hub part 25 positioned in a center, a ringlike part 27 which is positioned on the outer side of the radial direction of the hub part 25 and of which a plurality of teeth 26 is formed on the peripheral surface, a web 28 by which the ringlike part 27 and the hub part 25 and integrally connected to ech other, and a rib 29 extended from the hub part 25 toward the ringlike part 27. In this case, the height H of the rib 29 projected from the surface of the web 28 to the axial line direction of the gear 14 is set higher in a rib part provided in vicinity of the hub part 25 and the ringlike part 27, and is set lower in an intermediate part 30 therebetween. |
