| 摘要 |
PROBLEM TO BE SOLVED: To provide an intake duct having a valve part that can open and close an intake flow passage and suppressing flapping of the valve part.SOLUTION: An annular guide part 11 is provided to a duct body 1, and the valve part 2 having a plate-like wind receiving part 21 is mounted on the guide part 11. As the guide part 11 is inclined with respect to the axis of the duct body 1, by the valve part 2 rotating with respect to the duct body 1, the projecting height of the wind receiving part 21 with respect to the intake flow passage 15 is varied. The valve part 2 is driven toward an open position with a small projecting height of the wind receiving part 21 by the wind receiving part 21 being pressed by intake air. Further, by the tare weight of the wind receiving part 21, the valve part 2 is driven toward a closed position with a large projecting height of the wind receiving part 21. |
