Valve rod assembly with coupling cavity
A coupling cavity and valve stem technology, applied in engine components, machines/engines, charging systems, etc., can solve problems such as reducing the service life of the injector, needle valve bounce, and complex structure, reducing impact and improving Effects on reliability and part life
Pending Publication Date: 2021-10-22
钧风电控科技泰州有限责任公司
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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
Method used
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Embodiment Construction
[0018] Such as Figure 1 to Figure 4 As shown, a valve stem assembly with a coupling cavity adopts a new structural design. By setting a connecting sleeve and an adjusting pad between the control rod and the needle valve, when the control rod moves upward, the control rod and the connecting sleeve Moving together, the needle valve creates a slight gap between the sleeve, pad and lever. Due to the negative pressure formed in the coupling cavity, a small amount of fuel will enter the coupling cavity. When the control rod moves downward to close the fuel injection state, the small amount of fuel in the coupling cavity acts as a buffer, reducing the impact of the needle valve on the seat surface, reducing the impact load of the needle valve, needle valve body, control rod and adjustment pad, Improved reliability and part life. It includes a needle valve body structure 140, the upper end of the needle valve body structure 140 is matched with a cylindrical adjustment pad 130, and ...
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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...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F02M61/10F02M61/16
CPCF02M61/10F02M61/16
Inventor 于建锋王景致徐小松
Owner 钧风电控科技泰州有限责任公司