| 摘要 |
PROBLEM TO BE SOLVED: To supply sufficient electric power even when power generating quantity is reduced by using a space not used in a hub dynamo. SOLUTION: A secondary battery 28a to store electric power generated by a generator 34 is stored in a hub body 6 in a hub dynamo to generate electric power by a generator 34 provided in the hub body 6 by rotation of a front wheel 3 by supporting the hub body 6 provided on the front wheel 3 on a hub shaft 16 free to rotate. It is possible to efficiently use a space in the hub dynamo by providing the secondary battery in the hub dynamo, to supply sufficient electric power even when generated electric power is small by supplying electric power by using the secondary battery and to supply stable electric power regardless of travelling speed.
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