Fuel injection nozzle having coating layer and manufacturing method thereof
AssigneeDenso Corporation
InventorYutaka Niwa
Life of this patent
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Abstract
A coating layer made of a lipophobic material is provided in a distal end of a nozzle needle of a fuel injection nozzle. The coating layer is formed by soaking the distal end of the nozzle needle in a liquid state lipophobic material.
Claims14
A fuel injection nozzle comprising:
- a nozzle body that includes a fuel injection hole and a valve seat, wherein the valve seat is located on an inlet side of the fuel injection hole;
- and
- a nozzle needle that includes an engaging portion, which is seatable against the valve seat to stop fuel injection through the injection hole, wherein:
- the nozzle needle has a coating layer in an outer wall of the nozzle needle;
- and
- the coating layer is made of a lipophobic material.
A manufacturing method of a fuel injection nozzle, which includes a nozzle body and a nozzle needle, wherein the nozzle body includes a fuel injection hole and a valve seat, and the nozzle needle includes an engaging portion, which is provided in a distal end of the nozzle needle and is seatable against the valve seat to stop fuel injection through the injection hole, the manufacturing method comprising:
- soaking the distal end of the nozzle needle in a liquid state lipophobic material to a predetermined depth to apply the lipophobic material to the distal end of the nozzle needle.
Dependencies are inferred from the claim text.