| 摘要 |
PROBLEM TO BE SOLVED: To provide a chain case that does not affect auxiliary sprockets and the like, even when external force acts from the vehicle body side in electric bicycles.SOLUTION: Between an auxiliary sprocket cover part 3 of a chain case 1 and an auxiliary drive unit 17 a spacing member 60 is arranged to maintain an interval between the chain case 1 and an auxiliary sprocket 21 at predetermined intervals. |
