| 摘要 |
PURPOSE:To improve the extent of efficiency yet better, by specifying the length and sectional area of a pipe interconnecting surge tanks in each suction pipe all the time, in case of an engine which interlocks these independent suction pipes of two cylinder groups via a throttle valve and improves a degree of charging efficiency by a resonance effect. CONSTITUTION:Two cylinder groups 21 and 22 forming such cylinders as being unadjoined in suction sequence into one group charges air to surge tanks 71 and 72 at each cylinder group via a manifold 9, split passages 81 and 82 and throttle valves 101 and 102, while air charging takes place for each cylinder separately from these surge tanks. An interval between these surge tanks 71 and 72 are interconnected with a resonance pipe to be normally interconnected and an on-off valve 13 to open at high speed. When pipe length of these split passages 81 and 82 is set to l and the pipe diameter to (d) while half length of the resonance pipe 11 to L and the pipe diameter to D, respectively, they are set up so as to satisfy the condition of d/l<1/2D/L<1/2>. With this constitution, if the valve 13 is being closed at low speed, suction air resonates with the resonance pipe 11 being relatively large in diameter whereby it comes to have no relation with the split passage so that there is not influence of these throttle valves 101 and 102. |
