| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the welding strength of a porous member, and to lower the intake pressure loss in an intake air duct formed at a part of a pipe wall of a duct body and having an opening covered with the porous member such as a nonwoven fabric. SOLUTION: A porous member 2 is welded to a tip of an opening of small cylinder part 20 projected from the pipe wall of the duct body 1 while preventing the deformation of the duct body 1. subflow of the air passing thorough the porous member 2 is straightened while it flows inside of a small cylinder part 20, and the influence thereof to a main flow is reduced, and the intake pressure loss is thereby lowered.</p> |
