New Injector Nozzle Dlla150p1622 0433171991 Fuel Injection Nozzle for Fuel Injector 0445120078 0445120393

The fuel injector plays an important role in the normal operation of the diesel engine, and the needle valve coupling is inseparable from the fuel injector, and its performance directly affects the fuel economy and power of the diesel engine. The needle valve coupling is one of the precision couplings in the high-pressure common rail injector, and its sealing performance directly affects the working characteristics of the injector. The sealing characteristics of the precision couple are closely related to the lubrication and wear of the mating surface of the couple and the leakage of the oil film in the gap between the couple. cause the engine not to run normally. As the fuel pressure increases, the precision coupling will undergo elastic deformation, and this deformation will change the thickness distribution of the pairing gap of the coupling. The change in the thickness of the paired gap in turn changes the velocity distribution and pressure distribution of the oil film flow field in the gap, so the sealing of the needle valve coupling is a coupling problem between the gap oil film flow field and the structure of the needle valve coupling.

In terms of the tightness of the needle valve coupling, the needle valve coupling is one of the precision couplings in the high-pressure common rail injector. The sealing characteristics of the needle valve assembly has become a problem that must be considered in increasing the injection pressure of the high-pressure common rail injection system. There are two main parts where the needle valve couple has a sealing effect, namely: the gap oil film and the sealing cone surface. The DLC coating can have a certain protective effect on the needle valve, and for the sealing cone surface of the needle valve coupler, it can also significantly improve its anti-wear performance.