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Fuel injection valve

A technology of fuel injection valve and fuel, which is applied in the direction of fuel injection device, special fuel injection device, charging system, etc. It can solve the problem of shrinking cavity flow path area, achieve the effect of increasing the degree of freedom and promoting atomization

Active Publication Date: 2015-12-02
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, in the existing fuel injection valve, the inlet of the injection hole is provided inside the main flow of the fuel flow flowing from the seat portion of the valve seat, and the flow path area of ​​the cavity directly above the injection hole is sharply reduced.

Method used

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  • Fuel injection valve
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] figure 1 is a cross-sectional view along the axis of the fuel injection valve according to Embodiment 1 of the present invention, and fuel is fed from figure 1 The upper end of the fuel injection valve flows downward. In the drawing, a cylindrical fixed iron core 2 is fixed to an upper end portion of a magnetic tube 1 . The magnetic tube 1 and the fixed iron core 2 are arranged coaxially. The magnet tube 1 is press-fitted into the downstream end of the fixed iron core 2 and welded.

[0036] A valve seat 3 and an orifice plate 4 are fixed at the lower end of the magnetic tube 1 . The orifice plate 4 is provided with a plurality of injection holes 5 for injecting fuel. The nozzle holes 5 penetrate the nozzle hole plate 4 in the plate thickness direction.

[0037] The orifice plate 4 is inserted into the magnet tube 1 while being fixed to the downstream side end surface of the valve seat 3 by the first welding portion 4a, and then fixed to the magnet tube 1 by the sec...

Embodiment approach 2

[0073] Next, Image 6 This is a cross-sectional view of the valve seat 3, orifice plate 4, and valve ball 6 of the fuel injection valve according to Embodiment 2 of the present invention, and a plan view showing the center of the orifice plate 4 (viewed from the valve ball 6 side along arrow VI). The figure of the part exposed in the fuel flow path) is shown in combination, Figure 7 will be Image 6 The enlarged cross-sectional view of Part VII, Figure 8 will be Image 6 The enlarged top view of Part VIII.

[0074] In the first embodiment, the convex portion 4c is provided at the center of the orifice plate 4, but in the second embodiment, the center of the orifice plate 4 is flat. In addition, in Embodiment 2, the front end portion of the valve ball 6 is provided with a flat portion 6 b parallel (or substantially parallel) to the orifice plate 4 . The flat portion 6 b faces the center of the upstream end surface of the nozzle hole plate 4 . When projected vertically o...

Embodiment approach 3

[0081] Next, Figure 9 It is an enlarged cross-sectional view showing the injection hole 5 of the fuel injection valve according to Embodiment 3 of the present invention. In Embodiment 3, in the flow path of the injection hole main body 5a, a cylindrical portion 5f having the smallest cross-sectional area is provided between the inlet and the outlet of the injection hole main body 5a. Other structures are the same as those in Embodiment 1.

[0082] In such a fuel injection valve, since the flow rate of fuel in the injection hole 5 depends on the cross-sectional area of ​​the cylindrical portion 5f, the flow rate deviation caused by the positional deviation of the injection hole main body 5a and the large diameter portion 5b can be suppressed.

[0083] The injection hole main body 5a of Embodiment 2 may also be provided with a cylindrical portion 5f. That is, Embodiments 2 and 3 can be combined.

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Abstract

A fuel injection valve is configured in such a manner that each of the injection holes comprises an injection hole body and a large-diameter section which is located adjacent to and downstream of the injection hole body and which constitutes the outlet of the injection hole. When each of the injection holes is projected perpendicularly onto a plane perpendicular to the axis of a valve seat, the center of the inlet of the injection hole body and the center of the outlet thereof are arranged on the plane in such a manner that the centers are arranged side by side on a radial straight line passing through the axis of the valve seat and in such a manner that the center of the outlet is farther from the axis of the valve seat than the center of the inlet. The center of the large-diameter section is offset from the straight line, and consequently, the length of a portion of the inner wall of the injection hole body, the portion facing the axis of the valve seat, is asymmetric relative to the straight line.

Description

technical field [0001] The present invention relates to a fuel injection valve used 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 and the degree of freedom of injection direction is increased. Background technique [0002] In recent years, fuel consumption restrictions and exhaust gas emission restrictions on automobiles have become increasingly strict, and fuel spray injected from fuel injection valves has been required to be atomized. For this reason, in the conventional fuel injection valve, the inlet of the injection hole is provided inside the main flow of the fuel flow flowing from the seat portion of the valve seat, and the area of ​​the flow path of the cavity directly above the injection hole is sharply reduced. Accordingly, the fuel flow having a large entry angle at the inlet of the injection hole is promoted, and atomization of the fue...

Claims

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Application Information

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IPC IPC(8): F02M61/18F02M51/06
CPCF02M51/0682F02M61/1833F02M61/1853F02M61/186F02M61/188F02M2200/8084
Inventor 桥居直也
Owner MITSUBISHI ELECTRIC CORP
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