A common rail injector

Abstract

The invention discloses a common rail fuel injector, which comprises a fuel injector body part, a solenoid valve part and a fuel injector part. The present invention realizes the fuel injection control function by combining the two-position three-way electromagnetic control valve part and the fuel injection nozzle part with adjustable opening pressure, which makes the structure of the fuel injector simpler and can realize the flexible control of the fuel injection starting point and the fuel injection volume . The electromagnetic control valve core of the present invention is designed as a fuel pressure self-balancing structure, which can significantly improve the fuel injection opening response speed and reduce the driving current of the electromagnet, effectively improving the service life and reliability of the electromagnet. The present invention does not have the structure of the pressure control chamber, the oil outlet orifice control ball valve and the control piston pair of other traditional common rail injectors, so there is no need for precision parts with difficult processing technology, the processing difficulty is greatly reduced, and the process cost is also corresponding reduce.

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 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 inlet or...

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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