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Fuel injection valve

A fuel injection valve and fuel technology, applied in the direction of fuel injection devices, special fuel injection devices, charging systems, etc., can solve the problems of insufficient negative pressure, difficulty in cavitation, different fuel volumes, flow rates, etc., and achieve the promotion of micronization Effect

Inactive Publication Date: 2013-01-23
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the proposal of the above-mentioned Patent Document 1, the amount and flow velocity of the fuel flowing into the injection hole differ depending on the lift amount of the valve needle.
Therefore, it is difficult to achieve optimal cavitation both when the valve needle is in a low-lift state and when the valve needle is in a high-lift state
That is, when the cross-sectional area of ​​the injection hole is rapidly enlarged to cause cavitation, if the lift amount of the valve needle increases, the negative pressure will be insufficient due to the expansion of the flow path area of ​​the fuel, making cavitation difficult to occur.
On the other hand, when the flow path area and the shape of the nozzle hole are set so as to generate proper cavitation when the lift increases, there is a concern of excessive cavitation when the valve needle is in a low lift state

Method used

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Embodiment 1

[0029] A fuel injection valve 100 according to Embodiment 1 of the present invention will be described with reference to the drawings. figure 1 It is a schematic diagram showing the front end portion of the fuel injection valve 100 in an exploded state. figure 2 (A) is an explanatory diagram showing the fuel injection valve 100 in a closed state, figure 2 (B) is an explanatory view showing the fuel injection valve 100 in a state where the needle 104 is lifted and the control member 103 is lifted.

[0030] The fuel injection valve 100 includes a nozzle body 101 provided with a bag chamber 102 at a front end thereof and provided with an injection hole 103 opening in the bag chamber 102 . Four injection holes 103 are provided at equal intervals. The fuel injection valve 100 further includes a needle 104 slidably disposed inside the nozzle body 101 , and a fuel inlet leading to the bag chamber 102 is formed between the needle 104 and the nozzle body 101 . Road 105. The valve...

Embodiment 2

[0041] Next, a fuel injection valve 200 according to Embodiment 2 will be described with reference to the drawings. image 3 It is a schematic diagram showing the front end portion of the fuel injection valve 200 in an exploded state. Figure 4 (A) is an explanatory diagram showing the fuel injection valve 200 in a closed state. Figure 4 (B) is an explanatory diagram showing the fuel injection valve 200 in a low lift state. Figure 4 (C) is an explanatory diagram showing the fuel injection valve 200 in a high lift state.

[0042] The fuel injection valve 200 of the second embodiment differs from the fuel injection valve 100 of the first embodiment in that the fuel injection valve 200 includes a needle 204 instead of the needle 104 . In addition, the fuel injection valve 200 includes the nozzle body 101 and the control member 107 similarly to the fuel injection valve 100 . In the drawings, the same reference numerals are assigned to common components of fuel injection valve...

Embodiment 3

[0054] Next, a fuel injection valve 300 according to Embodiment 3 will be described with reference to the drawings. Figure 5 It is a schematic diagram showing the front end portion of the fuel injection valve 300 in an exploded state. Figure 6 (A) is an explanatory diagram showing the fuel injection valve 300 in a closed state. Figure 6 (B) is an explanatory view showing the fuel injection valve in a low flow rate state. Figure 6 (C) is an explanatory diagram showing the fuel injection valve 300 in a high flow rate state.

[0055] The difference between the fuel injection valve 300 of the third embodiment and the fuel injection valve 100 of the first embodiment is that the fuel injection valve 300 includes a controller 307 instead of the controller 107 . In addition, the fuel injection valve 300 includes the nozzle body 101 and the valve needle 104 similarly to the fuel injection valve 100 . In the drawings, the same reference numerals are assigned to common components ...

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PUM

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Abstract

Disclosed is a fuel injection valve with a suction chamber disposed in the tip thereof and comprising: a nozzle body with a nozzle hole that opens into the suction chamber; a needle slidably positioned in the nozzle body and which forms a fuel introduction path to the suction chamber between said needle and the nozzle body; and a cylindrical control element that is positioned by a positioning unit disposed between an upper edge section of the suction chamber in the nozzle body and the needle hole and which is displaced towards the upstream side such that the position of an upstream-side edge section approaches the needle, when the needle lifts for the fuel to flow into the suction chamber. A narrow distance between the upstream-side edge section and the needle can be maintained, cavitation can be continually generated, and atomization of fuel can be promoted, by the upstream-side edge section approaching the needle.

Description

technical field [0001] The invention relates to fuel injection valves. Background technique [0002] Conventionally, it is known that it is effective to atomize fuel spray in order to reduce particulate matter (particulate matter composed of black smoke, carbon, hydrocarbons, etc.) discharged from an internal combustion engine. As a proposal aimed at atomizing fuel spray, for example, Patent Document 1 is known. The injection hole provided in the fuel nozzle disclosed in Patent Document 1 includes a first injection hole portion on the upstream side and a second injection hole portion on the downstream side. Furthermore, in the second injection hole portion, there is a storage portion for accommodating a part of the injection flow as a fuel pellet between the inner wall of the second injection hole portion and the injection flow flowing out from the first injection hole portion. That is, in the fuel nozzle disclosed in Patent Document 1, by increasing the cross-sectional ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/18F02M61/10
CPCF02M2200/26F02M61/162F02M61/1886
Inventor 大前和广
Owner TOYOTA JIDOSHA KK
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