| 摘要 |
In a multi-blade fan for an air-cooled engine, by defining the inlet angle beta1 and the angle beta'2 to make the sum thereof less than 80° (preferably defining beta1 as 32° and beta'2 as 36°), the multi-blade fan achieves greater air volume than in the case where the sum is made 80° or greater, where beta1 is the angle between the relative velocity direction and the peripheral direction on the inlet side of the blades, beta2 is the angle between the relative velocity direction and the peripheral direction on the outlet side of the blades, and beta'2 is the difference obtained by subtracting beta2 from 180°. The number of blades can therefore be reduced to realize lower noise level while still maintaining the same air volume as the prior art multi-blade fan.
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