| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling fan made of a fiber reinforced resin that can suppress warpage at injection mold. SOLUTION: In a cooling fan 10 including a boss portion 13 injection molded with a fiber reinforced resin, that fits into a rotary shaft, a back shroud 14 connected to the boss portion 13, a plurality of blades 15 provided on the back shroud 14, and a cast hole 16 formed in the back shroud 14, the cast hole 16 is formed in triangle or pentagon, and one apex is arranged in an outwardly radial direction, and an opposite side of the apex is arranged in an inwardly radial direction. COPYRIGHT: (C)2011,JPO&INPIT
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