Start and stop control valve of high-pressure common rail oil injector

Abstract

The invention discloses a start and stop control valve of a high-pressure common rail oil injector. The start and stop control valve of the high-pressure common rail oil injector comprises a valve base, a valve element and an oil inlet guide valve sleeve; a conical base surface hole, a vertical oil outlet hole and an upper transverse oil inlet groove are arranged on the upper end surface of the valve base; the valve element is provided with a closing oil inlet hole, a closing oil outlet hole, a lower transverse oil inlet groove, an injecting oil inlet hole and an injecting oil outlet hole; theclosing oil inlet hole communicates with the closing oil outlet hole through the lower transverse oil inlet groove; the injecting oil inlet hole communicates with the injecting oil outlet hole through the upper transverse oil inlet groove; the smallest aperture of the closing oil outlet hole and the injecting oil outlet hole is smaller than the aperture of the vertical oil outlet hole; an axial oil inlet groove is formed in the outer circular side wall of the oil inlet guide valve sleeve; and the axial oil inlet groove communicates with the closing oil inlet hole and the injecting oil inlet hole through an oil inlet ring. The start and stop control valve of the high-pressure common rail oil injector is shorter in valve needle start and stop response time and more thorough in oil injectionand oil failure, improves the power density of the oil injector, can further improve the diesel engine power output, reduces the diesel engine emission, and is a key part of an energy-conservation and environmental-protection diesel engine.

Description

Technical field: [0001] The patent of the present invention relates to a common rail fuel injector for a diesel engine, in particular to a high pressure common rail fuel injector. 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 lock cap 3, a valve stem 4, a sealing ball 5, the present invention 6 and a solenoid valve component 7, and the solenoid valve component 7 includes an electromagnetic 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 ...

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

Images