Diesel Injector Fuel Injector 0445120332 Bosch for Cummins 6.7 engine

type injector structure
The hole type injector has 1~7 holes with a diameter of 0.15~0.70 mm, which can spray out a certain cone angle and has a long range. The choice of hole type should be determined by the type of combustion chamber. For example, the 6120 diesel engine uses a dual-hole injector with a hole diameter of 0.4 mm and an injection pressure of 17-150 kPa. The 6135 engine is a @-shaped combustion chamber that uses a 4-hole injector with a hole diameter of 0.35 mm and an injection pressure of 16 660 kPa. The structure of the hole injector is mainly composed of the injector body, the fuel injection cone, the fuel injection cone valve, the fuel injection valve body, the ejector rod, the pressure regulating tube, the pressure regulating screw oil inlet joint, the filter element and the oil return pipe bolt and so on. The pressure at the beginning of fuel injection depends on the pre-tightening force of the pressure regulating spring. It can be adjusted by the pressure regulating screw. During the fuel injection process, a small part of the leaked diesel will flow from the needle valve.
The pintle injector generally has 1 injection hole with a diameter of 1~3 mm. Due to the large hole diameter, the fuel injection pressure is low, generally 9800~11760 kPa, which is suitable for the divided combustion chamber. The structure of the pintle injector and the orifice injector is roughly the same. The difference is that the needle valve sealing cone extends a section of pintle, and the diameter is smaller than the nozzle hole. An annular slit is formed between the pintle and the hole. The pintle shapes are cylindrical and inverted conical. When the sealing cone surface of the needle valve leaves the valve seat, the oil injection starts, and the oil column is in the shape of a hollow ring. The injection angle of the inverted tapered pintle is relatively large. When the fuel injector starts to inject fuel and quickly stops injecting fuel, the pintle is in the injection hole, and the fuel injection volume is small, which can reduce the rough work of the diesel engine and shorten the filling time. Expect. This kind of injector is easy to process. The nozzle hole is not easy to block. The manufacturing cost is lower and the failure is less.