TRANSMISSION WHEEL, MANUFACTURE THEREOF, AND AUTOMATIC WHEEL TRAIN STRUCTURE

摘要

PROBLEM TO BE SOLVED: To reduce the number of manufacturing processes of a transmission wheel. SOLUTION: A second transmission wheel 100 is constituted of two bodies of a gear 1 and a pinion 2. A hole section 12 for assembling the pinion 2 is drilled through the central part of the gear 1 and two chord-like stopping sections 13 are provided to the hole section 12. The chord lengths of the stopping sections 13 are nearly equal to the interval between two adjacent teeth 21 of the pinion 2. At the time of fitting the pinion 2 in the gear 1, two adjacent teeth 21 and 21 of the gear 13 are positioned to both sides of each stopping section 13. Therefore, the relative rotation between the gear 1 and pinion 2 in the peripheral direction can be suppressed by engaging the teeth 21 and 21 of the pinion 2 with the stopping sections 13 even when no notch is provided to the pinion 2.