Fuel injection valve

A fuel injection valve comprising:

• a nozzle body having an injection aperture in a tip portion thereof;
• a needle that is slidably located in the nozzle body, forms a fuel introduction path between the needle and the nozzle body, and is seated on a seat portion in the nozzle body;
• a swirling flow generation portion that is located more upstream than the seat portion, and imparts a swirl with respect to a sliding direction of the needle to fuel introduced from the fuel introduction path;
• and
• a swirl velocity increasing portion that is located more downstream than the seat portion, and supplies fuel to the injection aperture while producing an air plume by increasing a swirl velocity of a swirling flow generated in the swirling flow generation portion.

A fuel injection valve comprising:

• a nozzle body having an injection aperture in a tip portion thereof;
• a needle that is slidably located in the nozzle body, forms a fuel introduction path between the needle and the nozzle body, and is seated on a seat portion in the nozzle body;
• a swirling flow generation portion that is located more upstream than the seat portion, and imparts a swirl with respect to a sliding direction of the needle to fuel introduced from the fuel introduction path;
• and
• a swirl velocity increasing portion that is located more downstream than the seat portion, and supplies fuel to the injection aperture while increasing a swirl velocity of a swirling flow generated in the swirling flow generation portion, wherein
• the needle includes a porous member in a tip portion at a combustion chamber side, and
• the porous member includes an opening portion extending toward the injection aperture and facing the injection aperture.