| 摘要 |
<p>PURPOSE:To make an independent suction passage smoothly connectable to an interconnecting part without altering a passage area of the suction passage, by forming a section of a connecting part of the independent suction passage, to be installed at every cylinder, with the interconnecting part interconnecting the said passage with each other into a flat form. CONSTITUTION:In case of a suction device being in a state of having a suction port 4 of each cylinder 2 interconnected to a suction expansion chamber 9 to be extended in a cylinder train direction via an independent suction passage 8, each interconnecting passage 14 interconnecting each independent suction passage 8 mutually is connected to the point midway in each independent suction passage 8 via each branch passage 13 extending in parallel with the suction expansion chamber 9 and to be branched off from each of these suction passages 8. At each branch passage 13, there is provided with each on-off valve 15, being opened at a high speed range where an engine speed is more than the specified value, side by side. And, a section of a connecting part of each suction passage 8 with the interconnecting part 14 of each independent suction passage 8 is formed into a flat form setting length L1 in a cylinder train direction down to a long diameter (L1=L2) corresponding to a passage diameter L2 of the branch passage 13. With this constitution, dynamic effect of suction air is improved whereby an output improvement is made so as to be promoted.</p> |
