Patent ID: 7066408

Claim:
A fuel injection valve in which a nozzle hole is formed on a metering plate and fuel flowing on a face on the upstream side of the metering plate is injected outside of a face on the downstream side of the metering plate, the fuel injection valve comprising: a vortex flow generator means for making a flow of fuel passing in the nozzle hole form into a vortex flow, wherein the vortex flow generator means is provided on the upstream side of the metering plate, wherein the vortex flow generator means is a vortex flow generator groove provided on a face on the upstream side of the metering plate so that the vortex flow generator groove can be connected to a wall face of the inlet of the nozzle hole, a main stream of fuel flowing in the groove is directed to a position deviating from a center of the nozzle hole, and the following relations are established, L ×⅕ <F<L ×⅔ D ×½ <N<D ×3 D ×⅕ <H<D ×⅔ D ×⅕ <B<D ×½, where D is a diameter of the nozzle hole, L is a thickness of the metering plate, F is a depth of the vortex flow generator groove, N is a length of the vortex flow generator groove, H is a width of the vortex flow generator groove, and B is an offset of the center line in the longitudinal direction from the center of the nozzle hole.