| 摘要 |
PROBLEM TO BE SOLVED: To prevent temperature rising of outside air taken into a duct by forming at least one part of an intake duct with synthetic resin material on which a porous component is added. SOLUTION: A case 3b of an air cleaner device 3 is formed with a synthetic resin material 12 on which a porous component 13 is added. As the porous component 13, inorganic porous body such as a porous glass and a porous ceramic is used, for example. As a resin material as a base of synthetic resin material 12, polypropylene and a material wherein a reinforcing material adding resin is added on polypropylene are used. A heat insulating effect of the case 3b is improved comparing with a conventional case constituted with synthetic resin not including the porous component 13. Even if air taken in an air cleaner device is warmed by heat in an engine room, a degree where its temperature is raised is small, and a density of air taken into an internal combustion engine 9 is held higher than that of a conventional case so as to improve an output efficiency.
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