High-power-density high-pressure common rail fuel injector

Abstract

The invention relates to a high-power-density high-pressure common rail fuel injector. The high-power-density high-pressure common rail fuel injector comprises a valve body and a throttle body, wherein the throttle body comprises a valve seat, a valve core and an oil inlet guide valve sleeve; a conical seat hole, a vertical oil outlet hole and an upper transverse oil inlet groove are formed in theupper end face of the valve seat; a closed oil inlet hole, a closed oil outlet hole, a lower transverse oil inlet groove, an injection oil inlet hole and an injection oil outlet hole are formed in the valve core; the closed oil inlet hole communicates with the closed oil outlet hole through the lower transverse oil inlet groove; the injection oil inlet hole communicates with the injection oil outlet hole through the upper transverse oil inlet groove; the minimum aperture of the closed oil outlet hole and the injection oil outlet hole is smaller than the aperture of the vertical oil outlet hole; and an axial oil inlet groove is formed in the outer circumferential side wall of the oil inlet guide valve sleeve, and the axial oil inlet groove communicates with the closed oil inlet hole and the injection oil inlet hole through an oil inlet ring. According to the high-power-density high-pressure common rail fuel injector, the response time of needle valve opening and closing is enabled to be shorter, oil injection and cutting off is more thoroughly, the power density of the fuel injector is improved, the power output of diesel engine is further improved, and the emission of the diesel engine is reduced. The high-power-density high-pressure common rail fuel injector is the key part of the energy-saving and environment-friendly diesel engine.

Description

Technical field: [0001] The patent of the present invention relates to an electronically controlled common rail fuel injector for diesel engines. Background technique: [0002] The structure of the prior art fuel injector assembly is as follows: figure 1 , figure 2 As shown, it includes a valve body 1, an oil injection coupler 2, a locking cap 3, a valve stem 4, a sealing ball 5, a throttle body 6 and a solenoid valve component 7, and the solenoid valve component 7 includes a solenoid coil 71, an armature seat 72, The armature rod 73 and the spring 74, the fuel injection coupling 2 is composed of the needle valve 21 and the needle valve body 22, and the valve body 1 is provided with a central hole 11, a high-pressure oil inlet hole 12, an upper outer oil passage 13, and a lower outer oil passage 14. The valve stem 4 is installed in the center hole of the valve body 1 in the form of clearance fit. The lower guide section of the valve stem 4 is pressed on the needle valve 2...

AI Technical Summary

Problems solved by technology

Existing high-pressure common rail injectors cannot simultaneously reduce opening time and closing time

The power density of the existing high-pressure common-rail injector is small, which cannot meet the supporting requirements of high-efficiency and energy-saving diesel engines. Therefore, the existing high-pressure common-rail injector must be improved and designed

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