Novel common-rail fuel injector

Abstract

The invention discloses a novel common-rail fuel injector. The common-rail fuel injector comprises a fuel injector body component, an electromagnetic valve component and a fuel injection nozzle component, wherein the electromagnetic valve component and the fuel injection nozzle component are mounted at upper and lower ends of the fuel injector body component respectively. The fuel injection control function is realized in such a manner that the two-position three-way electromagnetic control valve component and the fuel injection nozzle component with adjustable opening pressure are combined, the fuel injector is simpler in structure, and the initial fuel injection point and the fuel injection quantity can be controlled flexibly. An electromagnetic control valve core of the fuel injector is designed to adopt a fuel pressure self-balancing structure, the fuel injection starting response speed can be significantly increased, the driving current of an electromagnet can be significantly reduced, the service life of the electromagnet is effectively prolonged, and the reliability of the electromagnet is effectively improved. The common-rail fuel injector is free of pressure control chamber structures, outgoing fuel throttling hole control ball valves and control piston couple pairs of other traditional common-rail fuel injectors, so that precise parts and components with great machining technology difficulty are not required, the machining difficulty is greatly reduced, and the technological cost is correspondingly reduced.

Description

technical field [0001] The invention relates to a fuel injector suitable for a common rail system of a diesel engine, in particular to a novel common rail fuel injector capable of flexibly controlling the fuel injection starting point and the fuel injection quantity. Background technique [0002] At present, the common rail fuel injectors widely used at home and abroad are mainly composed of solenoid valves, pressure amplification systems and fuel injection nozzle parts. Among them, the pressure amplification system is mainly composed of a pressure control chamber, a control piston pair, an oil outlet orifice control ball valve, and a needle valve body oil tank. Among them, the pressure control chamber is mainly composed of the top of the control piston, the oil inlet orifice, and the oil outlet orifice. The volume of the pressure control chamber determines the response speed when the needle valve is opened and closed. The flow characteristics and consistency of the oil in...

AI Technical Summary

Problems solved by technology

The disadvantage of the typical Bosch common rail injector construction described above is that the tolerance range necessary for the good operation of the injector can only be achieved by very complicated testing and expensive manufacturing costs, especially when depending on the injection pressure in the pressure control chamber. When adjusting the diameter ratio between the inlet orifice and the outlet orifice due to the oiler cracking pressure

[0004] At present, the technological level and mechanical processing equipment of general fuel system manufacturers in my country cannot fully meet the requirements, and the product qualification rate is low, which restricts the promotion and application of the common rail system to a certain extent.

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