To further improve intake charge efficiency by resonance effect in a high speed side driving condition, and to prevent mutual interference between pressure pulsation of high speed intake passages and low speed intake passages.
Branch intake passages 11-14 of this intake device 7 are provided with first intake passages 11c-14c extended from first outlet parts 11a-14a, and curved at least at a middle part, and second intake passages 11d-14d extended from second outlet parts 11b-14b to be combined with the first intake passages 11c-14c from the outer side of their curvature. By a rotary valve 21 installed on a cylindrical part 20 of combined parts 11e-14e, the second intake passages 11d-14d are communicated with the first intake passages 11c-14c in the low speed side driving condition while closing the first outlet parts 11a-14a, and the first outlet parts 11a-14a are communicated with the first intake passages 11c-14c in the high speed side driving condition while closing the second intake passages 11d-14d.
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HIRASHITA SHIGEYUKI
FUJIKAWA TATSUYA
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