| 摘要 |
PROBLEM TO BE SOLVED: To suppress the generation of tooth skipping of a belt, when torque acted on a rotation shaft at the time of traveling on a slope or starting of pedaling, in a belt driving type bicycle. SOLUTION: An elliptic driving pulley 18 is rotatably attached to a stay 4, and a crank 14 is coupled to both ends of the rotating shaft 12 of the driving pulley 18. At a rotating shaft 22 of a rear wheel, a driven pulley 20 is provided. A belt 24 is wound around the driving pulley 18 and the driven pulley 20. A supporting member 30 is provided coaxially with the rotating shaft 12 so as to rock. The supporting member 30 comprises a stretching side arm 30A extending to a stretching side of the belt 24, and a loosening side arm 30B extending to a loosening side of the belt 24. At a tip end of the stretching side arm 30A, the stretching side idler 32 contacting with an outer peripheral surface of the belt 24 is provided. At a tip end of the loosening side arm 30B, the loosening side idler 34 contacting with an outer peripheral surface of the belt 24 is provided. COPYRIGHT: (C)2008,JPO&INPIT
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