| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an intake device of an internal combustion engine capable of controlling the strength of a tumble flow formed in a combustion chamber in a wide range by reducing intake resistance within an intake passage. Ž<P>SOLUTION: An intake pipe 30 forms the intake passage 31 having a rectangular shape in cross section to lead air to the combustion chamber of the internal combustion engine. As for longitudinally cross sectional shapes of a pipe shaft direction of the intake pipe 30, a first inner wall 33 has a circular-arc recessed part 330 recessed in a circular-arc surface shape from the viewpoint of the intake passage 31 side, and a second inner wall 34 opposite to the first inner wall 33 has a low and planar step recessed part 340 from the viewpoint of the intake passage 31 side. A valve shaft 12 of an air current control valve 10 is provided on a pipe shaft direction upstream side of the step recessed part 340. The air current control valve 10 is fixed by the valve shaft 12, has a valve element 11 extending in a longitudinally cross sectional fan shape toward a distal end 13, and is rotated and driven. The valve element 11 sections an opening of the valve element intake passage 31 between the valve element 11 and the first inner wall 33 to lead air from a cut-out groove 15 formed at the distal end 13 to the combustion chamber side in an opening from a full closed position to a half-opened position. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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