Electronically Controlled High Pressure Fuel Injector with Improved Armature Upward Limiting Device

Abstract

The invention provides an electrically controlled high-pressure fuel injector with an improved armature ascending limiting device. The electrically controlled high-pressure fuel injector comprises a fuel injector body, an armature, an armature shaft and an armature guiding sleeve, wherein the armature guiding sleeve sleeves the armature shaft. The electrically controlled high-pressure fuel injector further comprises an armature ascending limiting plate arranged on the axial lower side of the armature guiding sleeve, a through hole allowing the armature shaft to penetrate is formed in the area, corresponding to the armature shaft, of the armature ascending limiting plate, a stop part is arranged at the part, close to the axial lower end surface, of the armature shaft, and the ascending stop position of the armature is limited by abutting between the stop part and the armature ascending limiting plate. The electrically controlled high-pressure fuel injector can realize a space as small as possible between the ascending stop position and the descending stop position of the armature to obtain an insensitive tolerance chain, and further can eliminate unstable factors in limiting the armature, thereby achieving a stable and accurate travel of the armature.

Description

technical field [0001] The invention relates to an electronically controlled high-pressure fuel injector, in particular to an electronically controlled high-pressure fuel injector with an improved armature upward limiting device for aviation heavy oil piston engines. Background technique [0002] Aviation heavy oil piston engine is an important driving force for future aviation, especially the main driving force for general aviation and unmanned aerial vehicles. It is the most advanced aviation engine technology in the world today, with good power, economy, emission, safety, reliability and health characteristics. . [0003] The electronically controlled high-pressure fuel injection system is an important technology for aviation heavy fuel piston engines to realize time-pressure controlled injection of heavy fuel, optimize combustion and thermal cycle, and obtain good power, economy, comfort and emission indicators. The fuel injection pressure of the electronically controll...

AI Technical Summary

Problems solved by technology

If the above stability and accuracy cannot be guaranteed, it may cause jet disorder, resulting in increased variance of single jet, or even unable to achieve effective jet

[0008] In the prior art, due to the large distance tolerance chain between the upper and lower stop positions of the armature shaft, and the unstable limit of the armature on the armature shaft, the working surface of the armature is not perpendicular to the magnetic force line, which directly affects the armature. Stability and accuracy of travel

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