| 摘要 |
A hub assembly includes a tube having a fist connection portion on each of two ends thereof and each first connection portion has multiple first flat surfaces. Two flange parts are respectively connected to the two ends of the tube and each have a connection part and a second connection portion on two opposite sides thereof. The second connection portion includes an extension part and a groove is defined between the extension part and the flange part. The extension part is shaped to be inserted into the first connection portion corresponding thereto. A tubular member extends through the connection part and the second connection portion of each of the two flange parts. At least one bearing is located between the two flange parts and the tubular member. Two end rings are respectively connected to the connection parts.
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