| 摘要 |
PROBLEM TO BE SOLVED: To stably obtain a desired intake inertia effect by separating air- tightly adjacent extension parts into each other, while suppressing an increase of slide resistance when a surge tank is rotated. SOLUTION: In this device, length of an intake passage in the downstream of a surge tank is formed variable in accordance with rotation of the surge tank 30. Here, an annular groove is provided respectively in an outer peripheral location of the surge tank opposed to an internal periphery of each axial direction partition part 24, a seal member having a notched part is respectively fit mounted in each annular groove, an outer peripheral surface of the seal member is slide abutted to the internal periphery of each axial direction partition wall part, also a lock part locking each notched part in the peripheral direction in the vicinity of a communication port 35 of the surge tank is provided in each annular groove.
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