A common rail fuel injector based on two-position three-way principle

Abstract

The invention relates to a common rail fuel injector with two-position three-way principle, which includes a fuel injector body, a fuel injection nozzle assembly, a control piston, a control valve, a nozzle tight cap, a return spring and an electromagnet; The parts are composed of a needle valve and a needle valve body; the needle valve body is connected with the injector body through the oil nozzle tight cap to realize fastening and sealing; the needle valve is connected with the control piston; Two-position three-way valve consists of an upper valve body, a lower valve body and a sealing ball, the lower valve body is arranged with an oil inlet hole, and the upper valve body and the armature connecting rod of the sealing ball cooperate with each other to form an oil outlet hole; The control valve seals the oil inlet hole during the injection process; the solenoid drives the control valve to complete the injection process of the injector. The invention effectively solves the problems in the prior art that the oil return volume of the injector during the injection process is too large, the response of the needle valve movement is poor, the opening and closing speed of the needle valve is slow, and the pressure fluctuation of multiple injections is relatively large. big and other issues.

Description

technical field [0001] The invention belongs to the field of injection systems of internal combustion engines, and relates to a novel common-rail fuel injector, in particular to a common-rail fuel injector with a two-position three-way principle. Background technique [0002] Energy saving and emission reduction is the only way for the sustainable development of modern society. The engine is an important engine in the power industry, and efficient and clean combustion is the core to achieve further energy saving and emission reduction. The combustion of an internal combustion engine is a process in which chemical energy is converted into mechanical energy. It is a process in which oxygen and fuel react chemically with each other in the combustion chamber of the cylinder. It can be seen that the fuel supply system of the internal combustion engine is indispensable. The fuel supply system of the internal combustion engine Generally referred to as the fuel system. [0003] Wit...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the prior art that the oil return volume of the injector during the injection process is too large, the response of the needle valve movement is poor, the opening and closing speed of the needle valve is slow, which affects the improvement of the injection times, The large pressure fluctuation of multiple injections affects the stability of small fuel injection and other issues, and a common rail injector with two-position three-way principle is provided

Images