PROBLEM TO BE SOLVED: To provide an acoustic absorbent which exerts an acoustic absorption effect even in a limited space in an engine cover.SOLUTION: An acoustic absorbent comprises a louver 23 which is slantly attached to an internal face of an engine cover 21 so as to cover projection faces of a plurality of ventilation holes 22, ... which are formed at the engine cover 21 of a movable crane, and acoustic absorption materials 24, 25 being the acoustic absorption materials 24, 25 which are arranged at the louver 23, attached to an entire face of the louver 23, become maximum in thicknesses in positions approximate to the ventilation holes 22, ..., and are reduced in thicknesses as separating from the ventilation holes 22, .... The acoustic absorption materials 24, 25 are constituted of at least the first acoustic absorption material 24 which is arranged while approximating the ventilation holes 22, ..., and relatively thick in thicknesses, and the second acoustic absorption material 25 which is arranged while separating from the ventilation holes ..., and relatively thin in thicknesses.SELECTED DRAWING: Figure 3
【課題】エンジンカバー内の限定された空間内でも吸音効果を奏する吸音材の構造を提供する。【解決手段】移動式クレーンのエンジンカバー21に設けられた複数の通風孔22、・・・の投影面を覆うように、エンジンカバー21の内面に傾斜して取り付けられるルーバー23と、ルーバー23に設置される吸音材24、25であって、ルーバー23の全面に貼り付けられ、通風孔22、・・・に近接した位置で厚みが最大となり、通風孔22、・・・から離れるにしたがって厚みが減少するようにされた、吸音材24、25と、を備えている。この吸音材24、25は、少なくとも、通風孔22、・・・に近接して設置され相対的に厚みの大きい第1吸音材24と、通風孔、・・・から離れて設置され相対的に厚みの小さい第2吸音材と25、によって構成されている。【選択図】図3
STRUCTURE OF ACOUSTIC ABSORBENT
吸音材の構造
2016-10-13
Patent
Electronic Resource
Japanese
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