A high pressure common rail injector

Abstract

The invention discloses a high-pressure common rail fuel injector. It includes a fuel injector body. The fuel injector body is sequentially provided with a solenoid valve, a control valve body, an intermediate body, a needle valve body and a protective cap from top to bottom. The solenoid valve is arranged below the middle of the fuel injector body Position, the needle valve body is provided with a needle valve, the needle valve body is provided with a pressure chamber, the lower end of the needle valve body is provided with an oil injection hole, and the top of the needle valve is provided with a pressure control chamber, so The pressure control chamber is formed by the sleeve and the top of the needle valve, the control valve body is provided with a control valve rod, the upper end of the control valve rod is connected with the spool of the solenoid valve, and the outer periphery of the control valve rod is provided with a ring The pressure control chamber is provided with an oil inlet passage and an oil outlet passage, the oil inlet passage communicates with the oil inlet pipe, and the oil outlet passage communicates with the ring cavity. The volume of the pressure control chamber of the present invention is reduced, the pressure change rate is high, and the bottom-mounted electromagnetic valve effectively improves the response speed of the needle valve. The overall outer diameter of the fuel injector is small and has better adaptability.

Description

technical field [0001] The invention relates to a fuel injector, in particular to a high-pressure common rail fuel injector. Background technique [0002] The high-pressure common rail injector is the core component of the common rail system. The internal structure and working principle of the injector have a great influence on the responsiveness, reliability and durability of the injector; the traditional common rail injector In the injector, the high-pressure seal is realized by the pre-tightening force of the solenoid valve spring. With the development of the injector technology to high rail pressure and high injection pressure, the control valve stem connected with the spring bears a greater axial force, so A considerable spring preload of the solenoid valve is required to achieve the effect of high-pressure sealing. When the solenoid valve is powered on, a greater electromagnetic force is required to overcome the preload of the spring and drive the control valve stem to...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the deficiencies in the above-mentioned prior art, and provides a high-pressure common rail fuel injector, which solves the problem of poor responsiveness and reliability of the existing fuel injectors, large size and difficult installation in order to meet the requirements of high rail pressure and high injection And other issues

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