Novel common rail injector

Abstract

The invention discloses a novel common rail injector. The novel common rail injector comprises an injector part, an electromagnetic valve part and an injection nozzle part. The electromagnetic valve part and the injection nozzle part are installed at the upper end and the lower end of the injector part correspondingly. The mode combining the two-position three-way electromagnetic valve control part with the injection nozzle part with adjustable starting pressure is adopted, the structure is simple, and the injection initial point and injection amount can be flexibly controlled. A control valve element and an armature lever are of a fuel pressure self-balancing structure, the injection starting response speed can be remarkably increased, and the drive current of an electromagnet can be lowered, so that the service life of the electromagnet is effectively prolonged, and the reliability of the electromagnet is effectively improved. Return oil throttling holes are formed in an adjusting shim, return oil can be effectively controlled, and the return oil amount is reduced. Return oil grooves are formed between valve bodies, and the leakproofness can be remarkably improved. Pressure control chamber structures, oil outlet throttling hole control ball valves and control piston matching part pairs of traditional common rail injectors are omitted, the parts are easy to manufacture, the manufacturing difficulty is low, and the process cost is low.

Description

technical field [0001] The invention relates to a novel common rail fuel injector capable of flexibly and effectively controlling the starting point of fuel injection and freely adjusting the fuel injection quantity. Especially suitable for diesel engine common rail system. Background technique [0002] With the increasingly stringent emission regulations, the society has higher and higher requirements for engine emissions, and improving the fuel injection system can effectively improve the combustion conditions, improve combustion efficiency and reduce emissions, so the application of high-pressure common rail technology is becoming more and more extensive. The common rail fuel supply pump in the high-pressure common rail fuel system can generate stable high-pressure fuel into the common rail pipe, through the electronic control (injector solenoid) of the injection system (common rail injector) connected to the common rail pipe. To achieve the purpose of controlling the fu...

AI Technical Summary

Problems solved by technology

When this type of needle valve switch is used, there will be an overlap time that makes the oil return passage and the oil inlet passage open at the same time, and the oil inlet passage and the oil return passage are temporarily connected. The appearance of this overlap time makes the high-pressure fuel directly enter the return If it goes into the oil channel, it will inevitably increase the oil return amount of a single injection and reduce the injection efficiency

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