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Fuel injection valve

A fuel injection valve, fuel technology, applied in the direction of fuel injection devices, special fuel injection devices, fuel injection devices with anti-corrosion measures, etc.

Active Publication Date: 2019-06-28
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this measure leads only to a limited improvement in the existing construction of valve bodies which are only chrome-plated

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0020] A fuel injection valve of a first embodiment of the present disclosure injects fuel for combustion of an internal combustion engine from an injection hole. The internal combustion engine is a compression ignition diesel engine, and is installed in a vehicle as a driving source for travel. Fuel (such as light oil) remaining in a fuel tank not shown is pressure-delivered into the common rail by a high-pressure fuel pump, and then distributed from the common rail into each fuel injection valve 10 and injected from the fuel injection valve 10 to the combustion in the room.

[0021] Such as figure 1 As shown, the fuel injection valve 10 includes a body 20 , a valve needle 30 , a driving part 40 , a control valve element 50 , a control plate 60 and a cylinder 61 .

[0022] The body 20 includes a plurality of metal parts, such as a driving part body 21 , a valve plate 22 , an orifice plate 23 , and a valve body 24 , which are combined together by holding nuts 25 . Specifica...

no. 2 example

[0048] Such as Figure 6 As shown, the valve body 24A of the second embodiment has an intermediate layer 244 positioned between a sacrificial corrosion layer 245 and a corrosion resistant layer 242 . The intermediate layer 244 is provided by stacking a plurality of films. exist Figure 6 In , the respective films are indicated as intermediate layers 244a, 244b and 244c.

[0049] Each of the intermediate layers 244a, 244b, and 244c is formed by a method of depositing a film on the surface of the sacrificial etching layer 245 by chemical reaction in the gas phase, that is, by a chemical vapor deposition process. In particular, intermediate layers 244a, 244b, and 244c are desirably formed by atomic layer deposition (ALD), which is a chemical vapor deposition process.

[0050] The intermediate layer 244 has a linear expansion coefficient lower than that of one of the sacrificial corrosion layer 245 and the corrosion-resistant layer 242 and higher than that of the other of the s...

no. 3 example

[0061] Such as Figure 4 As shown, the valve body 24 of the first embodiment has a structure in which a sacrificial corrosion layer 245 and a corrosion-resistant layer 242 are disposed on a base material 241 . On the other hand, if Figure 7 As shown, the valve body 24B of the third embodiment has a structure in which a diffusion preventing layer 243 is provided on a base material 241 in addition to a sacrificial corrosion layer 245 and a corrosion-resistant layer 242 . The diffusion preventing layer 243 will now be described in detail.

[0062] The diffusion barrier layer 243 is located between the base material 241 and the sacrificial corrosion layer 245, and is made of, for example, aluminum oxide (Al 2 o 3 ) in which diffusion of the metal component (for example, iron) of the base material 241 is less likely to occur than in the corrosion-resistant layer 242 and the sacrificial corrosion layer 245. While "diffusion" is known as the phenomenon in which matter is dispers...

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PUM

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Abstract

A fuel injection valve includes a body (24, 24A, 24B, 24C, 24D) that includes an injection hole (24h) through which fuel is injected, and a valve element (30) that opens or closes the injection hole (24h). The body (24, 24A, 24B, 24C, 24D) includes a metallic base material (241) configured to form the injection hole (24h), a corrosion-resistant layer (242) covering a surface of at least a part ofthe base material (241) that forms the injection hole (24h) and being made of a less corrosive material than the base material, and a sacrificial corrosion layer (245) located between the base material and the corrosion-resistant layer (242) and made of a more corrosive material than the corrosion-resistant layer.

Description

technical field [0001] The present disclosure relates to a fuel injection valve that injects fuel. Background technique [0002] Regarding a fuel injection valve that injects fuel for combustion in an internal combustion engine from an injection hole, condensed water may adhere to a valve body having the injection hole. There is concern that the valve body may be corroded by condensation water adhering to it. In particular, when the portion of the valve body having the injection hole is corroded, the injection characteristics change, such as a change in the spray shape of fuel injected from the injection hole or a change in the amount of fuel. [0003] A countermeasure against this problem is disclosed in JP H5-209575A, in which the outer peripheral surface of the valve body and the inner peripheral surface of the injection hole are chrome-plated to improve the corrosion resistance of the valve body. [0004] In a prior art known technique, a part of exhaust gas from an in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/18
CPCF02M61/166F02M61/1886F02M2200/9046F02M2200/9038F02M2200/05
Inventor 山下司芹泽一史
Owner DENSO CORP
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