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Fuel injector

A technology of fuel injection device and injection port, which is applied in the direction of fuel injection device, charging system, engine components, etc., can solve the problems of atomization deterioration of spray shape, fuel droplet falling, and air-fuel ratio fluctuation.

Inactive Publication Date: 2009-06-03
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when the fuel injection device is used for in-cylinder injection, the fuel adhering to the valve core will accumulate as carbon deposits due to exposure to high temperature, resulting in the deterioration of the spray shape and atomization.
[0007] In addition, when used for intake pipe injection, the fuel adhering to the valve core will become droplets and fall, causing the problem of fluctuations in the air-fuel ratio

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Hereinafter, an embodiment of the present invention will be described based on the drawings.

[0028] figure 1 Is a cross-sectional view showing the fuel injection device of the first embodiment of the present invention, figure 2 It is a cross-sectional view showing the front end of the same device.

[0029] The fuel injection device of the present invention is provided with a valve device 1 which is composed of a valve core 2 and a valve body 3.

[0030] The valve core 2 has a guide portion 2a, and the guide portion 2a is provided with a two-face flat portion 2b. The fuel flows through the gap between the inner diameter portion 3a of the valve body 3 and the valve body 2 and the gap between the inner diameter portion 3a and the flat portion 2b. The front end of the valve element 2 is provided with a valve element seat portion 2c, and the valve element seat portion 2c is in contact with the valve seat 3b provided on the valve body 3 at the seat portion 3c. The valve elem...

Embodiment 2

[0038] image 3 It is a cross-sectional view showing a front end of a fuel injection device according to Embodiment 2 of the present invention. In this embodiment, the valve body 3 is provided with three annular grooves 11 on the upstream side of the seat 3c. With this groove 11, the fuel flow can be disturbed as in the first embodiment, and the atomization of the fuel spray ejected from the injection port 4 can be promoted.

[0039] In addition, in image 3 In the above, only the case where three grooves 11 are provided is described, but only one groove or a plurality of grooves other than three may be provided. In addition, grooves may be provided on both the valve core 2 and the valve body 3.

Embodiment 3

[0041] Figure 4 It is a cross-sectional view showing the front end of the fuel injection device according to the third embodiment of the present invention. In this embodiment, when the inclination angle of the valve core seat portion 2c is α1, and the inclination angle of the valve core tapered portion 2d on the downstream side of the seat portion 3c is α2, α1>α2, and the inclination angle of the valve seat 3b is β1, when the inclination angle of the valve seat taper portion 3d on the downstream side of the seat portion 3c is β2, β1>β2.

[0042] And the structure is made so that the valve seat outlet end surface 3e constituting the injection port 4 is inclined with respect to the axis 0 of the valve core 2 in an arc shape, that is, the valve seat outlet end surface 3e is structured to have a part covering the valve core end surface 2e and not Cover the part of the valve core end face 2e.

[0043] With the above structure, the fuel injection angle is inclined with respect to the ...

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PUM

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Abstract

The invention provides a fuel injector capable of improving atomization of a spray by forming various spray shapes and injection directions while restraining sticking of fuel to an injection port. A structure has a valve seat 3b having the injection port 4 and a valve element 2 for opening and closing the valve seat 3b. The valve is openned when the valve element 2 moves to the downstream side. The inclination angle of the valve element seat relative to the valve axle is larger than the inclination angle of the valve element cone part relative to the valve axle and the inclination angle of valve seat relative to the valve axle is larger than the inclination angle of the valve seat cone part relative to the valve axle and a gap of arc shape is set on the outlet end of the valve seat.

Description

[0001] The invention patent application is a divisional application of the invention patent application with the application number 200610153609.8, the filing date of September 6, 2006, and the name "fuel injection device". Technical field [0002] The present invention relates to a fuel injection device for an internal combustion engine, in particular to a fuel injection device that improves the shape and injection direction of the fuel spray and can promote the atomization of the fuel spray. Background technique [0003] In recent years, the emission regulations of automobiles and the like have been strengthened. Regarding the shape and direction of the fuel spray injected by the fuel injection device, it is desired to create a variety of shapes and directions and promote the atomization of the fuel spray. In particular, various discussions have been made regarding the atomization of the fuel spray. In conventional fuel injection devices, grooves are formed radially with respect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/08
Inventor 桥居直也宗实毅大西善彦
Owner MITSUBISHI ELECTRIC CORP