| 摘要 |
PROBLEM TO BE SOLVED: To provide an intake device capable of suppressing release of an intake air flow and effectively reducing pressure loss in a curved portion of an intake passage.SOLUTION: An intake port portion 20 of this intake air device 100 includes an intake pipe 1 connected to an internal combustion engine 90 and having a curved portion 3. The curved portion 3 includes a curved upstream portion 4 and a curve downstream portion 5. In a cross-section C2 of the curved downstream portion 5 orthogonal to an extension direction of the intake pipe 1, a distance H2 between an intake passage inner surface 5a on a curve outer side of the curved downstream portion 5 and an intake passage inner surface 5b on a curve inner side is gradually reduced along an intake air flow direction (arrow B direction) of the curved downstream portion 5 and a distance W2 between intake passage inner surfaces 5c and 5d orthogonal to and facing the intake passage inner surfaces 5a and 5b facing each other at the distance H2 is gradually increased along the intake air flow direction so that a cross-sectional area S of the curved downstream portion 5 is made constant along the intake air flow direction.SELECTED DRAWING: Figure 2 |
