| 摘要 |
PROBLEM TO BE SOLVED: To enhance the rigidity of a resin made gear and prevent any speed variation from occurring by installing a rib. SOLUTION: This gear 14 is provided with a hub part 25 being situated in a central part, a ringlike part 27 being situated in a radial outside of this hub part 25, and formed with plural pieces of gears 26 on the peripheral surface, a web 28 integrally connecting this ringlike part 27 and the hub part 25, and both first and second ribs 29A and 29E projectingly installed in a surface 28A on one side and a surface 28 on the other of the web 28. In this constitution, both first and second ribs 29A and 29B are set up after being dislocated with each other in the circumferential direction of the gear. |
