Fuel injection valve and method for forming orifice thereof

  • US 8,016,214 B2
  • Filed: 08/19/2008
  • Issued: 09/13/2011
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
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1. A fuel injection valve comprising:

  • a convex portion formed on an outer end surface of a nozzle body;

    a stepped recess formed on said convex portion, which stepped recess has plural step-recess parts; and

    an orifice forming a fuel nozzle hole which is disposed so that an outlet of said orifice is located at a bottom of said stepped recess;

    wherein,said orifice is inclined relative to an axis of said nozzle body;

    said stepped recess comprises a first step-recess part and a second step-recess part;

    said first step-recess part and said second step-recess part are adjacent each other in a direction of an axis of said orifice, and are disposed such that a bottom of said first step-recess part forms a downstream face in a fuel traveling direction in said nozzle body, a bottom of said second step-recess part forms an upstream face in the fuel traveling direction, an opening of said first step-recess is formed on a convex surface of said convex portion, and an opening of said second step-recess part is formed on the bottom of said second step-recess part;

    the bottoms of said first and second step-recess parts are respectively formed by surfaces that are substantially normal to the axis of said orifice;

    said orifice is formed so that the outlet of said orifice opens the bottom of said second step-recess part; and

    height of said first step-recess part is less than that of said second step-recess part.

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