| 摘要 |
PURPOSE:To obtain high output in the whole rotational frequency area by providing plural suction chambers corresponding to the number of cylinders of an engine, providing a communication path for communicating the above suction chambers with each other, and controlling the communicating path to be opened and closed. CONSTITUTION:A radiator 21 and a suction box 22 are disposed above a V-type two-cylinder engine of a motorcycle, and two conduit pipes 25a, 25b and two suction pipes 26a, 26b are connected to the suction box 22. The conduit pipes 25a, 25b are extended forward and opened forward in front of a front fork 14. In this case, the suction box 22 is constructed so that the interior of the main body 22a is divided into two suction chambers 27a, 27b by a partition wall 22b and the conduit pipes 25a, 25b are opened to the respective suction chambers 27a, 27b. A hole (communicating path) 28 for communicating the suction chambers 27a, 27b with each other is formed on the partition wall 22b, and a valve 29 for opening and closing the hole 28 is provided there. The valve 29 is controlled to be opened and closed according to the rotating speed. |
