Patent ID: 7510129

Claim:
A fuel injection nozzle for injecting fuel into an internal combustion engine, the fuel injection nozzle comprising: a body; and a valve element being movable in the body with respect to an axis of the body for opening and closing a path of the fuel to a sack room between the valve element and the body, the sack room being defined by an interior circumferential surface of the body, wherein the body has a plurality of nozzle hole groups that include a first nozzle hole group and a second nozzle hole group adjacent to the first nozzle hole group, each of the nozzle hole groups including at least two solitary nozzle holes, each of the solitary nozzle holes opening to and facing the sack room at an interior mouth thereof on the interior circumferential surface of the body, and wherein: an in-group hole distance Î± is defined to be a minimum interval among intra-group intervals that are formed between peripheral boundaries of interior mouths included within each one group of the nozzle hole groups; a group distance C is defined to be a minimum interval among inter-group intervals that are formed between (i) individual peripheral boundaries of interior mouths included in the first nozzle hole group and (ii) individual peripheral boundaries of interior mouths included in the second nozzle hole group; the group distance C is 0.8 or more times as large as the in-group hole distance Î±; the plurality of nozzle hole groups are arranged to be running radially with respect to the axis of the body so that an interval between a portion of each nozzle hole group and a portion of adjacent nozzle hole group gets longer as the portions get away from the interior circumferential surface of the body and get close to an exterior circumferential surface of the body; and the solitary nozzle holes included in the nozzle hole groups are arranged in the body extending from the interior circumferential surface to an exterior circumferential surface of the body (i) parallel with each other or (ii) radially with respect to the axis of the body while becoming farther separated from each other as the holes become closer to the exterior circumferential surface.