| 摘要 |
A rotor assembly includes a hub and a hood. The hub provides a shoulder wall extending the center thereof and a hub wall connecting the shoulder wall. The hood provides a top wall and a lateral wall connecting the top wall. The shoulder wall of the hub has a fixing part disposed next to the end thereof and the top wall of the hood provides a through hole fitting with the fixing part such that the hub mounts to the outer surface of the hood.
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