| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure an optimum intake performance over the overall operation area by dividing the inner part of a box-like intake passage by a bulkhead, providing a variable inlet port opened to both the divided suction air inlet part and intermediate passage part so as to straddle the bulkhead, and changing the opening of the variable inlet port by a switching plate. SOLUTION: In the low speed area of an engine, each switching plate 14, 15 is set in a position closest to a corresponding collector part 7, 8 to lay a variable inlet port 11 in the fully closed state. At this time, the suction air is supplied from a suction air inlet part 6 to each collector part 7, 8 through each resonance passage part 9, 10, and then supplied to each cylinder through a branch part 13, an intake port, and the like. As the engine is transferred to the middle speed area, each switching plate 14, 15 is moved toward the suction air inlet part 6 side by the operation of a stepping motor 22, and the inlet opening end of the branch part 13 determined by the edge position facing the variable inlet port 11 of the switching plate 14, 15 is moved toward the suction air inlet part 6 side to shorten the equivalent length of the branch part 13, so that the intake of air by resonance supercharge is performed.</p> |
