Patent ID: 7637442
Filing Date: 2009-12-29
Classification: F02M

Abstract:
1. A fuel injection valve comprising a valve seat member having a conical valve seat and a valve hole formed through a central part of the valve seat, a valve body for opening and closing the valve hole in cooperation with the valve seat, and an injector plate joined to the valve seat member and having a plurality of fuel injection holes radially outwardly displaced from the valve hole, a diffusion chamber providing communication between the valve hole and the fuel injection holes being provided between the valve seat member and the injector plate , wherein a fuel guide member facing the valve hole is connected to the injector plate, the diffusion chamber formed between the valve seat member and the injector plate has an annular shape, is faced by an outer peripheral face of the fuel guide member has a diameter that is larger than of the valve hole, and has inner ends of the fuel injection holes opening therein, the fuel guide member has formed in an outer peripheral portion a plurality of blocking portions partially blocking the valve hole and a plurality of cutouts that are present between blocking portions and provide communication between the valve hole and the diffusion chamber, and the cutouts are disposed to circumscribe an imaginary circle having a a center thereof on an axis (Y) of the valve seat member and the plurality of fuel injection holes are divided into two groups disposed symmetrically relative to a diameter (R) of the injector plate the fuel guide member is provided with first cutouts having a large cutout area and corresponding to a region in which a plurality of the fuel injection holes in a middle section of each of the groups are arranged, and second cutouts having a small cutout area and being positioned on the diameter (R) so as to face in opposite directions relative to each other, and the fuel injection holes in the outside section of each of the groups are disposed to face the respective blocking portions adjacent to the second cutouts.