To suppress a noise inside of a cab.SOLUTION: A duct structure 40 includes a cab approach guard opening 51 formed on a cab approach guard 20 and a center duct 60 which approximately communicates with the cab approach guard opening 51 and overlaps with a center section 10 when viewed from a vertical direction Z. The air sucked into an interior of the cab approach guard 20 from an inlet port provided on a rear side X2 end part of the cab approach guard 20 passes through an interior of the cab approach guard opening 51 and is discharged from the cab approach guard 20 and then passes through an interior of the center duct 60. The cab approach guard opening 51 is arranged closer to a front side X1 than noise sources (21, 22).SELECTED DRAWING: Figure 1

    【課題】キャブ内の騒音を抑制する。【解決手段】ダクト構造40は、キャブ近接ガード20に形成されるキャブ近接ガード開口51と、キャブ近接ガード開口51と略連通し、上下方向Zから見たときにセンターセクション10と重なるセンターダクト60と、を備える。キャブ近接ガード20の後側X2端部に設けられる吸気口からキャブ近接ガード20の内部に吸気された空気は、キャブ近接ガード開口51の内部を通ってキャブ近接ガード20から排出され、センターダクト60の内部を通る。キャブ近接ガード開口51は、騒音源(21、22)よりも前側X1に配置される。【選択図】図1


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    Title :

    UPPER REVOLVING BODY OF CONSTRUCTION MACHINE


    Additional title:

    建設機械の上部旋回体


    Contributors:

    Publication date :

    2020-09-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES / E02F Baggern , DREDGING




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