| 摘要 |
An electric bicycle frame (10) includes a seat tube (100), a down tube (200), a top tube (300), a battery box (400), and a battery body (500). The seat tube (100) includes an upper portion (101) and a lower portion (102). The down tube (200) includes a first end (201) and a second end (202). The second end (202) is connected to the lower portion (102). The top tube (300) includes a third end (303), an expanding tube (310), and a fourth end (304). The fourth end (304) is connected to the upper portion (101). The expanding tube (310) is between the third end (303) and fourth end (304). The expanding tube (310) includes a tube diameter varying portion (311) and a top opening (312). The tube diameter varying portion (311) includes continuously varying cross-sections. The battery box (400) is assembled inside the top opening (312) of the expanding tube (310). The battery body (500) is received in the battery box (400). |
