Diesel Injector Fuel Injector 0445120289 Bosch for Cummins Isbe Isde Qsb6.7

Another example is the double-hole closed fuel injector used in 6120 diesel engine. The diameter of the injection hole is 0.42mm and the injection pressure is 17.5M Pa. The working principle of the shaft needle injector is the same as that of the hole injector, only the structure is different: under the sealing cone at the lower end of the needle valve, a shaft needle extends out of the hole, and its shape can be inverted conical or cylindrical, so that the nozzle becomes a circular slit. In this way, the injection column will be hollow cone or column. The size of injection hole cross section and injection cone Angle depends on the lift and shape of the shaft needle, so the shape processing of the shaft needle is required to be very accurate. Shaft needle injector nozzle diameter is large (generally 1 ~ 3mm), injection pressure is low (generally 10 ~ 14MPa), self-cleaning ability is strong (injection hole is not easy to accumulate carbon and blockage), injection characteristics are good (meet the requirements of less oil injection at the beginning, more oil injection in the middle and less oil injection in the later), It is suitable for vortex chamber combustion chamber and precombustion chamber combustion chamber with low requirement on diesel filter quality. For example, the nozzle diameter of the 4125A4 diesel engine is 1.5mm and the injection pressure is 12.7M Pa. Three, low inertia fuel injector traditional fuel injector rod is long, the position of pressure regulating spring is far away from the needle valve, so that the needle valve up and down movement inertia increases, the impact of the needle valve on the sealing conical surface increases, the response sensitivity of the needle valve to oil pressure decreases.