Patent ID: 7654475

Claim:
A fuel injection valve for injecting fuel into an engine cylinder, the fuel injection valve comprising: a needle valve including: a tip; a seat surface; and a first groove engraved on an outer surface of the needle valve for guiding the fuel, the first groove having upper and lower ends, the upper and lower ends of the first groove being open, the needle valve being rotatable by the fuel flowing in the first groove and in response to a reciprocating movement of the needle valve; and a nozzle tip including: a borehole; at least one nozzle hole perforated in a neighborhood of a tip of the nozzle tip; a seat surface; and a plurality of second grooves engraved on the seat surface of the nozzle tip, the plurality of second grooves being arranged along respective directions inclined relative to a longitudinal direction of the nozzle tip, and inclined relative to a rotational direction of the needle valve, at least one second groove of the plurality of second grooves comprising a sharp edge for scraping-off deposited solid materials adhered to the seat surface of the needle valve, into the at least one second groove, by relative rotational movement between the seat surface of the nozzle tip and the seat surface of the needle valve, wherein the needle valve is fitted slidably in the borehole formed in the nozzle tip, and wherein a fuel flow passage between the seat surface of the needle valve tip and the seat surface of the nozzle tip is opened/closed by the reciprocating movement of the needle valve.