| 摘要 |
PURPOSE:To diminish noise by forming an air guide and the loading side bracket of a motor in a body, stretching the outer peripheral section of the air guide to the side of the bracket opposite to the loading side, and covering the center periphery of the bracket opposite to the loading side for forming a sound proof cylinder. CONSTITUTION:An air guide 17 and the bracket 14 opposite to the loading side are connected by screws or the like being formed in a body. The air guide 17 forms a cylinder section 17a on the side opposite to the loading side at the most external periphery and covers the outer periphery of the bracket 14 for forming a sound proof cylinder. The space formed by the bracket 14 and air guide 17 is filled with a sound absorption material 21 made of urethane having gas permeability. The constitution mentioned above allows the noise produced by a fan 18 to be absorbed by the sound absorption material 21 in the sound proof cylinder mentioned above. In addition the double framed wall composed of the bracket 14 and the cylinder section 17a forming the outer periphery of the air guide makes it possible to reduce noise further than with conventional wall made of only the bracket 14. And the formation of the air guide 17 with resin in a body as a component reduces assembly time also.
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