| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiblade fan for an air-cooled internal combustion engine capable of reducing noise level without reducing gas quantity. SOLUTION: When an angle formed by the direction of relative speed (direction of w1) on an inlet side of a blade 52 and the circumferential direction (direction of u1) is an inlet angleβ1, an angle formed by the direction of relative speed (direction of w2) on an outlet side and the circumferential direction (direction of u2) is an outlet angleβ2, and difference obtained by subtracting the outlet angleβ2 from an angle of 180°is an angleβ'2, the sum of the inlet angleβ1 and the angleβ'2 is set to less than 80°(to explain concretely,β1 is 32°andβ'2 is 36°). COPYRIGHT: (C)2007,JPO&INPIT
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