Patent ID: 11958567
Assignee: MOBILETRON ELECTRONICS CO., LTD
Field: Transport (Mechanical engineering)
Classification: CPC B  G  H | IPC B  G  H

Claim 8:
9. The coaxial mid-drive power device as claimed in claim 1, wherein
an end of the hollow shaft facing the reducing structure forms a large-diameter portion having an inner diameter greater than other portions of the hollow shaft;
a plurality of keyways are formed on an inner peripheral surface of the large-diameter portion; the reducing structure is a planetary gear reducer and the input end is a driving gear, wherein a portion of the driving gear extends into the large-diameter portion of the hollow shaft;
a plurality of key blocks respectively fits in one of the plurality of keyways, wherein an inside of the plurality of key blocks fits in a periphery of the driving gear for fixing.