| 摘要 |
PROBLEM TO BE SOLVED: To provide a bicycle having a drive change-over device with a simple structure. SOLUTION: This bicycle 2 has a main frame 4, a driving wheel, and a drive device. The drive device has a crank and the drive change-over device 28. The crank has a crank axle 34. The drive change-over device 28 has a driving gear 26, a free wheel mechanism 38 and a clutch mechanism 40. Rotation of the crank axle 34 is transmitted to the driving gear 36 via the free wheel mechanism 38. The clutch mechanism 40 has a first disk 52 and a second disk 54. The first disk 52 is integral with the driving gear 36. The second disk 54 is mounted so as to rotate together with the crank axle 34. By contact of the second disk 54 with the first disk 52, rotation of the second disk 54 is transmitted to the first disk 52. By rotation of the driving gear 36, the driving wheel is rotated. COPYRIGHT: (C)2009,JPO&INPIT
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