HUB UNIT FOR ELECTRIC POWER-ASSISTED HUMAN POWERED VEHICLE

摘要

[SUBJECT] To enable adoption of high-rotation and small-sized electric motor and to efficiently reduce diameter of entire hub unit for electric power-assisted human powered vehicle. [MEANS FOR SOLUTION] Speed-reduction mechanism portion (5) includes: speed-reduction sun gear (51) connected to rotor (44) of driving electric motor; stationary speed-reduction ring gear (52) protruding from motor case (41); speed-reduction output ring gear (53) protruding from hub case (2) inwardly in radial direction of stationary speed-reduction ring gear (52); speed-reduction carrier (54); and speed-reduction pinion (57) coaxially including first gear (55) meshing with speed-reduction sun gear (51) and stationary speed-reduction ring gear (52) and second gear (56) meshing with speed-reduction output ring gear (53). Pitch circles of speed-reduction output ring gear (53), stationary speed-reduction ring gear (52) and speed-change output ring gear (33) of speed-change mechanism portion are arranged inwardly in radial direction of outer periphery of stator (42).