| 摘要 |
PURPOSE:To make a large variation in passage length attainable with a small- sized device, by installing a partition turning member (a passage changing device), which varies an interconnecting position between an inner space of a surge tank and a suction passage, inside the surge tank, in case of a suction system making length of the suction passage variable. CONSTITUTION:In time of engine operation, the air inhaled out of an air cleaner flows into an inner space 17 of a first partition turning member 15 from an inner space 18 of a second partition turning member 16 as well. And, in case of an engine speed being low, the first partition turning member 15 alone is turned round by a driving device using exhaust pressure or the like as its driving source from an illustrated position to an (a) direction, and since the second partition turning member 16 is situated in the illustrated position, suction air reaches to a suction passage 11 after passing an extension part 13 in an S- shaped form way. And, when an engine speed goes up to more than the specified value, the second partition turning member 16 is turned round to a (b) direction, and these inner spaces 17 and 18 in each of these members 15 and 16 are interconnected with each other in consequence. |
