Leakage-free high-pressure common-rail electronic control fuel injector assembly

Abstract

The invention discloses a leakage-free high-pressure common-rail electronic control fuel injector assembly. An oil nozzle matching part comprises a needle valve body and a needle valve, wherein the needle valve is of a lengthened integrated structure, the lower end of the needle valve is installed in an inner cavity of the needle valve body, the control valve matching part comprises an oil nozzlematching part and a control valve seat, a tightening cap is arranged at the lower end of an fuel injector, the needle valve body is locked on the fuel injector through the tightening cap, the controlvalve seat is arranged at the upper end of the needle valve, a compression nut is arranged at the upper end of the fuel injector, the upper end of the control valve seat is tightly attached and sealedto the lower end of the compression nut, and the tightening cap locks the oil nozzle matching part on the fuel injector, so that the end face of the needle valve body and the end face of the fuel injector are sealed, and force applied to the needle valve spring promotes the control valve seat and the compression nut to be sealed. The fuel injector assembly can match with a diesel engine on the premise that the appearance and an installation mode of an original fuel injector does not changed, the defect that a conventional fuel injector has a large amount of low-pressure fuel return is overcome, fuel consumption of the engine is reduced, and the effective power of the engine is improved.

Description

technical field [0001] The invention relates to the technical field of fuel injectors for internal combustion engines, in particular to a non-leakage high-pressure common rail electronically controlled fuel injector assembly. Background technique [0002] At present, non-road diesel engines with emissions above China IV and on-road diesel engines with emissions above China VI all use high-pressure common rail electronically controlled injector assemblies, which have the characteristics of excellent emission indicators, good power, low noise, and comfort. However, there is leakage in the conventional fuel injector control valve coupling and needle valve coupling, which makes the fuel injector assembly return a large amount of fuel during operation. The effective power and fuel consumption increase; and the temperature of the return oil flowing out of the oil return hole from the injector is very high, resulting in an increase in the temperature of the oil flowing back to the ...

AI Technical Summary

Problems solved by technology

However, there is leakage in the conventional fuel injector control valve coupling and needle valve coupling, which makes the fuel injector assembly return a large amount of fuel during operation. The effective power and fuel consumption increase; and the temperature of the oil returned from the oil return hole when the injector is working is very high, resulting in an increase in the temperature of the oil flowing back to the fuel tank, and the system loses the effective power of the engine in order to reduce the temperature of the fuel tank

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