FUEL EJECTION NOZZLE AND ITS MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a fuel injection nozzle without depositing a deposit in a nozzle port, by flying away its fuel spray to the distance, by atomizing fuel. SOLUTION: An outlet 24 of a central part of a spiral chamber 23 rotating in a state of pressurizing a polishing fluid, is communicated with a nozzle port outlet. and the polishing fluid turned and radiated from the outlet 24 is made to flow to the nozzle port inlet side from the nozzle port outlet side, and a tapered part 21 is formed in a nozzle port inlet, and a spiral groove 22 is formed in an inner wall of a nozzle port 6 of a very small diameter. A nozzle port diameter is formed in a very small diameter, and the fuel spray is atomized. A flow speed of fuel passing through into the nozzle port 6 is increased by arranging the tapered part 21, and the fuel spray can be flown to the distance. The spiral groove 22 is also arranged to thereby prevent the temperature of the inner wall of the nozzle port 6 from reaching the generation temperature of the deposit, and the sticking deposit is removed by causing separation of the fuel in the inner wall of the nozzle port 6. COPYRIGHT: (C)2010,JPO&INPIT