| 摘要 |
An electric bicycle frame includes a seat tube, a down tube, a top tube, a battery box, and a battery body. The seat tube includes an upper portion and a lower portion. The down tube includes a first end and a second end. The second end is connected to the lower portion. The top tube includes a third end, an expanding tube, and a fourth end. The fourth end is connected to the upper portion. The expanding tube is between the third end and fourth end. The expanding tube includes a tube diameter varying portion and a top opening. The tube diameter varying portion includes continuously varying cross-sections. The battery box is assembled inside the top opening of the expanding tube. The battery body is received in the battery box. |
| 主权项 |
1. An electric bicycle frame, comprising:
a seat tube comprising an upper portion and a lower portion; a down tube comprising a first end and a second end, the second end being connected to the lower portion of the seat tube; a top tube comprising a third end, an expanding tube, and a fourth end, the fourth end being connected to the upper portion of the seat tube, the expanding tube being between the third end and the fourth end, the expanding tube at least comprising a tube diameter varying portion and a top opening, the tube diameter varying portion comprising continuously varying cross-sections, both of a width and a height of the continuously varying cross-sections gradually increasing along a longitudinal axis of the top tube; a battery box assembled inside the top opening of the expanding tube, the battery box comprising a surrounding lateral wall and a first connector, the first connector being disposed on the surrounding lateral wall; and a battery body detachably received in the battery box, the battery body comprising a second connector, the second connector correspondingly mating with the first connector. |
