Automatic speed change mechanism and hub motor

The utility model discloses an automatic speed change mechanism and a hub motor, and relates to the field of hub motors. According to the technical scheme, the automatic transmission comprises a hub, a machine core mechanism and an automatic transmission mechanism, and the automatic transmission mechanism is designed to be of a multi-position integrated structure. According to the speed change mechanism, the two sets of planet wheels are integrated on the planet carrier, the second-gear clutch inner ring and the outer end cover are integrally formed, and the third-gear clutch inner ring and the inner end cover are integrally formed, so that the axial size of the speed change mechanism can be optimized, the number of parts is reduced, and cost is reduced; the outer end cover of the automatic speed change mechanism is used as the outer end cover of the hub motor, and the outer end cover is detachably connected with the speed change shell through a bolt, so that the automatic speed change mechanism can be disass