Patent ID: 6908050

Claim:
A fuel injection valve comprising: a valve seat member having a fuel injection hole, and a valve seat formed upstream of the fuel injection hole; a swirler arranged in a fuel chamber having a cylindrical side wall upstream of said valve seat member to supply the fuel with swirling force; wherein said swirler includes a first surface facing to said valve seat member and a second surface in opposition to the first surface; wherein said swirler has a through hole formed at the center and bridging between the first and second surfaces; wherein the side of said swirler has a plurality of plane surfaces arranged at equal interval each other around the side and same number of curved surfaces alternatively positioned each other; wherein a polygonal protrusion surface with a plurality of sides are formed on the first surface and the protrusion has a swirling groove extending from each side of the protrusion to the through hole and opened at a position off-set with respect to the center; and wherein a radial groove extending radially from the through hole on the second surface and opened to the side surface.