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fuel injection valve

A fuel injection valve and fuel technology, which is applied to fuel injection devices, charging systems, machines/engines, etc., can solve the problems of insufficient acceleration, poor fuel spray atomization, and poor layout, and reduce the dead zone volume. , The processability is improved, the effect of large jet flow rate

Active Publication Date: 2019-09-27
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the swirling chamber and the fuel passage, the layout is poor, and it is difficult to increase the number of injection holes.
Because of these problems, it is difficult to obtain the large flow rate required by the engine with large displacement in the atomization method using swirling flow
[0008] In addition, by providing the passage and the swirl chamber on the upstream side of the injection hole, since the dead volume is larger than other atomization methods, the rectification and acceleration of the injected fuel will not be corrected immediately after the injection starts. Sufficient fuel has the problem of poor atomization of fuel spray at the initial stage of injection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0049] figure 1 A cross-sectional view of the fuel injection valve according to Embodiment 1 is shown in . Figure 2A , Figure 2B , image 3 , Figure 4 The front end portion of the fuel injection valve according to Embodiment 1 is shown, where Figure 2A A cross-sectional view of the front end is shown in the Figure 2B The top view is shown in the image 3 An enlarged view of the top view is shown in the Figure 4 The dimensional relationship in top view is shown in . In the figure, symbol 1 denotes a fuel injection valve, symbol 4 denotes a solenoid device, symbol 5 denotes a yoke portion of a magnetic circuit, that is, a housing, symbol 6 denotes a fixed iron core portion of a magnetic circuit, that is, an iron core, symbol 7 denotes a coil, and symbol 8 is a movable iron core portion of the magnetic circuit, that is, an armature, and 9 is a valve device, and the valve device 9 is composed of a valve core 10 , a valve main body 11 and a valve seat 12 . The valve m...

Embodiment approach 2

[0061] Figure 8 The front end portion of the fuel injection valve according to Embodiment 2 is shown in . In order to achieve atomization of fuel spray, it is important to form a thin and uniform liquid film along the inner wall of the injection hole, but once the swirling flow generated at the injection hole 14 is deflected, the liquid film formed on the inner wall of the injection hole will be partially become thicker and may impair micronization performance. Therefore, in Embodiment 2, there is provided the second fuel introduction path 21 for introducing fuel into the swirl chamber 17 from a direction different from that of the fuel introduction path 18 . At this time, at a position where the swirl direction of the fuel flowing into the swirl chamber 17 from the fuel introduction path 18 is the same as the swirl direction of the fuel flowing into the swirl chamber 17 from the second fuel introduction path 21, the fuel introduction path 18 and the The second fuel introdu...

Embodiment approach 3

[0065] Figure 9 The front end portion of the fuel injection valve according to Embodiment 3 is shown in . When two fuel introduction paths are provided for one swirl chamber, the relative angle of the two fuel introduction paths is about 180°, and the thickness of the liquid film formed on the inner wall of the injection hole 14 is Uniformity is best. Therefore, in the third embodiment, the thickness of the liquid film formed on the inner wall of the injection hole 14 is made more uniform by connecting the fuel introduction path 18 and the second fuel introduction path 21 with the swirl chamber 17 from directions opposite to each other, so that the fuel The degree of micronization of the spray is better.

[0066] In addition, in Figure 9 In the illustrated configuration, the fuel introduction path 18 and the communication portion of the second fuel introduction path 21 that communicates with the valve seat opening are shared. The dead volume is reduced by sharing the com...

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Abstract

The object of the present invention is to promote the atomization of injected fuel in a fuel injection valve of an internal combustion engine. In the fuel injection valve of the present invention, a swirl chamber and a fuel introduction path communicating with the swirl chamber are formed in the upstream end surface of the orifice plate, and the injection hole is opened in the swirl chamber. When the diameter of the swirl chamber is D, the fuel introduction path is set to be L, and a distance between a line where the center axis of the fuel introduction path at the downstream end is linearly extended and a center of the swirling chamber is L, L is smaller than (D-W) / 2.

Description

technical field [0001] The present invention relates to a fuel injection valve for supplying fuel to an internal combustion engine of an automobile, and more particularly to a fuel injection valve in which atomization in spray characteristics is promoted. Background technique [0002] In recent years, regulations on exhaust gas from internal combustion engines of automobiles have become stricter, and atomization of fuel spray injected from fuel injection valves has been demanded. For example, in the prior art disclosed in Patent Document 1, studies have been made to achieve micronization by forming a swirling flow. [0003] That is, in Patent Document 1, in a fuel injection valve in which a valve closing member cooperating with a valve seat surface is disposed in the valve housing, the valve housing is formed symmetrically with respect to the long-side axis, and is characterized in that The downstream of the valve seat surface is provided with a central opening, and at leas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/18
CPCF02M61/1853
Inventor 川崎翔太宗实毅伊藤启祐
Owner MITSUBISHI ELECTRIC CORP
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