FUEL INJECTION VALVE AND ADJUSTING METHOD THEREOF

摘要

PURPOSE: To make manufacture simple and adjust injection quantity at a high degree of accuracy by providing the thin bottom forming the locking member of a nozzle body with an inner wall and outer wall facing a needle valve. CONSTITUTION: A cylindrical bag aperture 49 is closed by the bottom 50 which is equipped with an inner wall 51 facing to a needle valve 27 and an outer wall 52 on the opposite side of the needle valve 27. The size of a nozzle hole 55 determines the fuel injection quantity. After the nozzle hole 55 is created by an erosion method employing silver wire material, the final sizing of the nozzle hole 55 is performed by means of a fluid polishing. Thus, the manufacturing process is simplified and an adjustment of an injection quantity can be performed at a high degree of accuracy.