| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the pressure loss of a means for straightening intake air on the intake upstream side of a flow sensor. Ž<P>SOLUTION: The device includes a straightening grating 12 on the intake upstream side of the flow sensor 3. The upstream side of an outlet duct 10 is provided as a funnel part 14 radially extended to the inside of a cleaner case 6. An annular outer circumferential-side bypass 13 is provided between the straightening grating 12 and the funnel part 14. The straightening grating 12 is arranged in an inflow part of intake air in the funnel part 14. A straightening duct 15 radially extended to the inside of the cleaner case 6 is arranged between the straightening grating 12 and the funnel part 14. The straightening grating 12 annularly includes an outer circumferential-side short straightening part 16 with a small thickness on the outer circumferential side. The straightening grating 12 has a convex lens shape swollen toward the intake upstream side. A hexagonal honeycomb structure is adopted in the straightening grating 12. The above structure greatly suppresses the pressure loss of an air-intake path. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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