Valve rod assembly with coupling cavity

Abstract

The invention relates to the technical field of high-pressure fuel injection valves, in particular to a valve rod assembly with a coupling cavity. According to the technical scheme of the invention, the valve rod assembly comprises a needle valve body structure, wherein the upper end of the needle valve body structure is provided with a cylindrical adjusting pad in a matching manner, an area of the upper end surface and an area of the lower end surface of the adjusting pad are both smaller than an area of the upper end surface of the needle valve body structure, the upper end of the adjusting pad is connected with a cylindrical control rod in an attached mode, the diameter of a first cylindrical outer circle face at the lower end of the control rod is the same as that of a second outer circle face at the upper end of the valve body structure, and the needle valve body structure, the adjusting pad and the control rod are tightly sleeved together through a cylindrical matching center hole in a cylindrical connecting sleeve. The valve rod assembly has the advantages that the assembly is simple in structure and lower in production and use costs, the impact force of the needle valve on the seat surface can be weakened in the use process, abrasion of the needle valve and a needle valve body is weakened, the durability of the needle valve and the needle valve body is improved, and the service lives of the needle valve and the needle valve body are prolonged.

Description

technical field [0001] The invention relates to the technical field of high-pressure fuel injection valves, in particular to a valve stem assembly with a coupling cavity. Background technique [0002] The fuel injector controls the start and end of fuel injection by controlling the needle valve to reciprocate up and down in the needle valve body. When the fuel injection is finished, the needle valve is seated, which will have a great impact on the sealing surface at the bottom of the needle valve body. When the impact force is very large, the needle valve sometimes rebounds, and then the injector injects abnormally, resulting in unstable performance of the injector. [0003] In addition, most of today's high-pressure fuel injection valve stem assemblies are integrated, which is difficult to process and has a complex structure. The sealing surface at the bottom of the needle valve body is subjected to a large impact force for a long time, which will cause the wear of the ne...

AI Technical Summary

Problems solved by technology

When the impact force is very large, the needle valve sometimes rebounds, and then the injector injects abnormally, resulting in unstable performance of the injector

[0003] In addition, most of today's high-pressure fuel injection valve stem assemblies are integrated, which is difficult to process and has a complex structure

The sealing surface at the bottom of the needle valve body is subjected to a large impact force for a long time, which will cause the wear of the needle valve and the sealing cone surface of the needle valve body, and reduce the service life of the injector

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