| 摘要 |
PURPOSE:To suppress NOx content in the high revolution region and reduce noise by forming at least a part of a fuel feeding passage leading to an injection nozzle from a fuel injection pump into two parallel passages having different length and diameter. CONSTITUTION:A fuel injection pump 1 and a fuel injection nozzle 2 are connected through a fuel feeding passage 3 consisting of two passages 4 and 5 in parallel. The length of one passage 4 is made longer than that of the other passage 5, and the diameter is made larger. Therefore, each of the pressure wave and injection rate of the supplied fuel in the fuel injection nozzle in the high revolution region is an engine represents the injection characteristic in two stages, and the nitrogen oxide in exhaust gas and noise can be reduced.
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