| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably perform a spray of fuel by a low penetration force at small-amount fuel injection. <P>SOLUTION: The fuel injection valve device includes a sack chamber having a curved bottom at its tip, and a nozzle body having a plurality of injection holes each having an entrance opening at the base end side rather than the bottom in the sack chamber. The device also includes a needle which is slidably arranged in the nozzle body, and forms a fuel introduction passage communicating with the sack chamber between the nozzle body and itself. Furthermore, the device has recesses which have bottom shapes corresponding to curved shapes of the bottom of the sack chamber, and are aligned differently from the alignment of injection holes at the top face opposing the needle, and an oscillator accommodated in the bottom so that fuel flowing in the sack chamber from the fuel introduction passage collides with the top face. The oscillator blocks part of the entrance opening of the injection hole by oscillation, and makes the fuel flowing in the injection hole generate cavitation. <P>COPYRIGHT: (C)2012,JPO&INPIT |
