MOTOR DRIVE UNIT FOR POWER-ASSISTED BICYCLE

摘要

PROBLEM TO BE SOLVED: To compactify a size. SOLUTION: An axle 12 is constituted by coupling a motor housing 8 and a support member 10 for a motor 41 with coupling bolts 9. The each coupling bolt 9 is arranged between fellow intermediate gears 55 located in a radial- directional inside of an outer circumferential gear 54 in a hub 15 side, and interposed between the gear 54 and a pinion 53 of an axial center part.