To provide an aerodynamic sound reduction structure of a current collector capable of protecting an aerodynamic sound reduction unit without impairing aerodynamic sound reduction effect.SOLUTION: An aerodynamic sound reduction structure 21A reduces aerodynamic sound generated from an aerodynamic sound generation source of a current collector 3. The aerodynamic sound reduction unit 23 covers a surface of the aerodynamic sound generation source to reduce the aerodynamic sound. A protection unit 24 has a plurality of through holes 24a through which flow F flows into and out of the aerodynamic sound reduction unit 23, and covers a surface of the aerodynamic sound reduction unit 23 to protect the aerodynamic sound reduction unit 23. The aerodynamic sound reduction unit 23 covers a surface of the aerodynamic sound generation source of an apex cover 8 of the current collector 3. In the protective portion 24, an opening ratio of the through holes 24a is 30% or more and 60% or less. In the protective portion 24, inner diameters of the through holes 24a are 3.0 mm or more and 8.0 mm or less. The aerodynamic noise reducing unit 23 is a porous metal material. In the protection portion 24, the plurality of through holes 24a are arranged so that center lines L of the plurality of through holes 24a coincides with a direction of the flow F.SELECTED DRAWING: Figure 8
【課題】空力音低減効果を阻害することなく、空力音低減部を保護することができる集電装置の空力音低減構造を提供する。【解決手段】空力音低減構造21Aは、集電装置3の空力音発生源から発生する空力音を低減する。空力音低減部23は、空力音発生源の表面を被覆して空力音を低減する。保護部24は、空力音低減部23に流れFが流入及び流出する複数の貫通孔24aを有し、空力音低減部23の表面を被覆して、この空力音低減部23を保護する。空力音低減部23は、集電装置3の頂点カバー8の空力音発生源の表面を被覆する。保護部24は、貫通孔24aの開孔率が30%以上60%以下である。保護部24は、貫通孔24aの内径が3.0mm以上8.0mm以下である。空力音低減部23は、金属製の多孔質材である。保護部24は、複数の貫通孔24aの中心線Lが流れFの方向と一致するように、複数の貫通孔24aが配列されている。【選択図】図8
AERODYNAMIC SOUND REDUCTION STRUCTURE OF CURRENT COLLECTOR
集電装置の空力音低減構造
2021-04-30
Patent
Electronic Resource
Japanese
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