Diesel Injector Fuel Injector 0445120264 Bosch for Foton Auv Bus Auman Forland Aumark 2000 Cummns 150t1

One of the most important is the needle valve and the needle valve body made of high quality bearing steel (generally known as the fuel injection nozzle or fuel injection head), the two together called the needle valve couple. When the injector works, the high pressure diesel oil from the injection pump enters the injector through the tubing joint, and then enters the annular high pressure oil chamber in the middle of the needle valve body through the oil inlet channel on the injector body. The oil pressure acts on the pressure cone of the needle valve and forms an upward axial thrust on the needle valve. When the thrust is greater than the pre-tightening pressure of the pressure regulating spring and the friction force between the needle valve couple (which is very small). The needle valve is vertically moved up, the sealing cone of the lower end of the needle valve is removed from the conical ring of the needle valve body, and the injection hole is opened, so that the diesel fuel is injected into the combustion chamber at high pressure. When the fuel injection pump stops supplying oil, the pressure in the high pressure oil passage drops rapidly, and the needle valve returns in time under the action of the pressure regulating spring to close the jet hole. The number of holes of the orifice injector is large (generally 1 ~ 8), the diameter of the orifice is small (generally 0.2 ~ 0.8mm), the injection pressure is high (generally 17 ~ 22MPa), the self-cleaning ability is poor (the orifice is easy to accumulate carbon and plug), and the quality of the diesel filter is high. It is suitable for direct injection combustion chamber which requires high spray quality. For example, the 5-hole closed fuel injector used in CA6110-2 diesel engine has a diameter of 0.32mm and an injection pressure of 17.2MPa.