| 摘要 |
PROBLEM TO BE SOLVED: To obtain a desired intake inertia effect by separating air-tightly adjacent extension parts from each other, while suppressing an increase of slide resistance when a surge tank is rotated with no high dimensional accuracy required. SOLUTION: This device variably forms length of an intake passage in the downstream of a surge tank 30 in accordance with rotation thereof. Here, a seal member 50 respectively provided between the internal periphery of each axial direction partition wall part 24 and the outer periphery of the surge tank 30 to seal a part between mutually adjacent extension parts 23 in the axial direction is fit mounted in the internal periphery of each axial direction partition wall part or in an outer peripheral location of the surge tank 30 opposed to the internal periphery of each axial direction partition wall part, also at least one annular lip part provided to extend in the diametric direction in the seal member 50 to be deformed in the axial direction in accordance with a pressure difference between the mutually adjacent extension parts to be air- tightly slide abutted to the axial direction end face in an outer peripheral location of the surge tank 30 opposed to the internal periphery of each axial direction partition wall part or to an axial direction end face of each axial direction partition wall part is provided.
|
