Patent ID: 9556843
Date: 2017-01-31
CPC Classifications: F02M,Y02T

Claim:
1. A fuel injection nozzle through which fuel is injected into a combustion chamber of an internal combustion engine, the fuel being a DME fuel containing dimethyl ether as a main component, the fuel injection nozzle comprising: a nozzle body having a plurality of injection holes; and a needle accommodated in the nozzle body to open or close the plurality of injection holes, wherein the nozzle body has the DME fuel in the tip end chamber is heated with combustion heat in the combustion chamber to have a supercritical state, at least one of the plurality of injection holes has a diameter which is smaller than a diameter of the other of the plurality of injection holes, the other of the plurality of injection holes being arranged around the at least one of the plurality of injection holes, the at least one of the plurality of injection holes is arranged to pass through a tip end part of the nozzle body and to extend on an axis of the nozzle body, fuel injected from the at least one of the plurality of injection holes is combusted in an area more adjacent to the tip end chamber than fuel injected from the other of the plurality of injection holes, the at least one of the plurality of injection holes is located at a center of the nozzle body in a radial direction, the other of the plurality of injection holes is arranged on an outer side of the one small hole in the radial direction at a fixed interval, the diameter of the at least one of the plurality of injection holes is constant from an end adjacent to the tip end chamber to the other end.