Patent ID: 7077341

Claim:
A fuel injection device comprising: a nozzle body having a fuel supply hole formed in the middle of the top end thereof, through which the fuel injected from an injection hole of an injector is supplied to a combustion chamber, a plurality of groups of spiral grooves and a plurality of edge grooves vertically alternately formed on the outer peripheral surface of the lower portion thereof in such a manner that each edge groove is positioned between two adjacent ones of the plural spiral groove groups, for flowing the fuel supplied through the fuel supply hole therethrough, each of the spiral grooves and the edge grooves being formed in such a manner as to have a flow sectional area gradually reduced from an inlet to an outlet, and a cylindrical shaped nozzle casing that is upwardly and downwardly opened and adapted to accommodate the nozzle body at a lower portion thereof and the injector at an upper portion thereof, in such a manner that the injector is positioned on the nozzle body and the injection hole of the injector is tightly secured onto the fuel supply hole of the nozzle body.