| 摘要 |
A fuel direct injection valve for diesel engines, in which a needle valve is rotated by first and second serrations formed in an edge portion of an opening of a nozzle body and in a base portion of the needle valve and by third and fourth serrations formed on the axially opposite side to the first and second serrations, and in which as the needle valve rotates, the area of the portion where a first nozzle hole formed in the nozzle body overlaps with second nozzle hole formed in a rotary valve increases. In the low load operation region, the area is small. In the high load operation, the area increases with the fuel injection pressure, so that the complete penetration force of the fuel injection can be large and constant, and the fuel effectively contacts and strikes squished air and satisfactory mixes with the air. This minimizes the delay of ignition and enhances the combustion, low-noise, and exhaust emission performances.
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