| 摘要 |
A cooling fan for cooling a mechanical section of a driving device attached to a rotary shaft including a plurality of blades configured to generate an airflow toward an outside of the rotary shaft in directions along radius directions of the rotary shaft with rotation of the rotary shaft, and a plurality of ribs that have widths in directions crossing the blades, extend toward outsides along the radius directions with respect to a center axis of the rotary shaft, reinforce the corresponding plurality of blades, and are directed on a side of the mechanical section at tips of the plurality of ribs, wherein at least parts of the blades exist inside the ribs along the radius directions of the ribs.
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