JPH0583366U - Fuel injection valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fuel injection valve capable of enlarging the spray foam angle and further reducing the particle size of the spray. 1 shows a valve seat, 2 is a needle valve, and 3 is a suck volume. Further, 6a and 6b are a plurality of orifices formed according to the present invention, and their directions are formed so as to approach each other toward the downstream side.
When fuel is injected from this orifice, the jet flows into the area 8
It collides violently in the vicinity and becomes the spray 7 and diffuses. In the present invention, the spray 7 is combined to increase the spray foam angle and collide with each other, whereby the spray 7 is atomized.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel injection valve, and more particularly to a fuel injection valve capable of increasing a spray angle of fuel injection (hereinafter referred to as a spray form angle) and reducing a particle size of the spray.

[0002]

[Prior Art]

 The structure of the fuel injection unit of the conventional fuel injection valve will be described with reference to FIG. In the figure, 1 is a valve seat, 2 is a needle valve that moves inside the valve seat 1 in its axial direction, 3 is a suck volume formed at the tip of the valve seat 1, and 4 is an orifice.

In the fuel injection valve having the above structure, when the fuel is injected from the orifice 4, the needle valve 2 is lifted by means not shown. Then, a gap (that is, a seat portion opening) is formed between the tip portion 5 of the needle valve 2 and the inner wall of the valve seat 1, and the pre-compressed fuel flows into the suck volume 3 from this gap. As a result, the fuel passes through the orifice 4 and is vigorously injected.

In the fuel injection valve having the above structure, the flow rate of fuel is defined by the diameter of the orifice 4.

[0005]

[Problems to be solved by the device]

 In the conventional fuel injection valve having the above-described configuration, the spray foam angle of the fuel injected from the orifice 4 is controlled by the ratio of the length L of the orifice 4 to the diameter D, that is, L / D. In order to widen the spray foam angle, it is necessary to reduce the L / D, but there is a limit in reducing L, that is, the thickness of the orifice 4 in terms of mechanical strength and processing accuracy. .. Therefore, the conventional device has a problem that the spray form angle cannot be sufficiently expanded.

Further, although the particle diameter of the spray injected from the orifice 4 is determined by the orifice diameter D and the fuel pressure, there is a limit to the increase of the fuel pressure, and there is a problem that the particle diameter of the spray cannot be made smaller. It was

An object of the present invention is to eliminate the above-mentioned problems of the conventional device, to provide a fuel injection valve capable of enlarging the spray foam angle and further reducing the particle size of the spray.

[0008]

[Means for Solving the Problems]

 To achieve the above object, the present invention provides a fuel injection valve configured to inject fuel from an orifice, wherein the orifice is formed of a plurality of orifices, and the plurality of orifices are disposed toward each other downstream of the jet flow. The feature is that they are facing toward each other or away from each other.

[0009]

[Action]

 According to the present invention, since the fuel is injected from a plurality of orifices, the spray form angles are expanded by combining the sprays injected from the orifices with each other, and atomization is promoted by the collision of the sprays. It

[0010]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view of the essential parts of an embodiment of the present invention, and FIG. 2 is a plan view of the partial structure when the valve seat 1 is looked up from below.

In the figure, 6a, 6b, ... Show orifices, and 7 shows the spray of fuel injected from the orifices 6a, 6b ,. Other reference numerals are the same as or equivalent to the same reference numerals in FIG.

The orifices 6a, 6b, ... Of the present embodiment are formed so as to approach each other from the suck volume 3 toward the downstream of the fuel injection. The orifices 6a, 6b, ... Are formed on a circle centered on the central axis of the valve seat 1, as shown in FIG. 2 (a). Alternatively, it is formed on a straight line passing through the central axis of the valve sheet 1 as shown in FIG.

Since the orifice of this embodiment has the above-described structure, when fuel is injected from the suck volume 3, the jets violently collide with each other in the vicinity of the region 8 in FIG. And spread.

When the spray foam angle and the average particle diameter of the spray in continuous spraying were measured using this example (three orifices), the former was 46 ° and the latter was 8 μm. On the other hand, when continuously spraying with a conventional single-hole orifice, the spray foam angle was 13 °, and the average particle size of the spray was 15 μm.

Therefore, according to this embodiment, it is possible to increase the spray foam angle by combining the sprays, and it is possible to further reduce the particle size of the sprays due to the collision of the sprays. Become.

When the orifices 6a, 6b, ... Are arranged so as to be aligned on a straight line as shown in FIG. 2 (b), the spray 7 is diffused so that its cross section becomes elliptical and the ignition in the cylinder is performed. Can be point oriented.

Next, a second embodiment of the present invention will be described with reference to FIG. In the figure, 9a, 9b, ... Denote orifices, and other symbols are the same as or equivalent to those of FIG. This embodiment is different from the first embodiment in that the orifices 9a, 9b, ... Are formed so as to separate from the suck volume 3 toward the downstream of the fuel injection.

Also in this embodiment, the arrangement of the orifices 9a, 9b, ... May be formed on a circle centered on the central axis of the valve seat 1 as described with reference to FIG. It may be formed on a straight line passing through the central axis of 1.

Since the orifice of this embodiment has the above-described configuration, when fuel is injected from the suck volume 3, the jet streams violently collide with each other in the vicinity of the area 8 in FIG. And spread.

Therefore, in the present embodiment, similarly to the first embodiment, the spray form angle can be expanded by combining the sprays, and the particle size of the spray can be made smaller. ..

As a result of the experiment, as shown in FIG. 4, the orifices 9a, 9b, ... Are arranged so that the intersection 9d of the center lines of the orifices 9a, 9b, ... Deviates from the center point 3a of the suck volume 3. It was found that the spray generated by the collision of the jets becomes smaller when the formation of, ...

In the above embodiment, the case where the number of orifices is 3 has been described, but the present invention is not limited to this, and the number of orifices may be 2 or 4 or more.

[0023]

[Effect of the device]

 As is clear from the above description, according to the present invention, the spray form angle of the fuel spray injected from the fuel injection valve can be expanded, and the particle size of the spray can be made smaller.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a fuel injection valve according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the arrangement of orifices in this embodiment.

FIG. 3 is a sectional view of an essential part of a fuel injection valve according to a second embodiment of the present invention.

FIG. 4 is a sectional view illustrating the orientation of an orifice according to a second embodiment.

FIG. 5 is a sectional view of a main part of a conventional fuel injection valve.

[Explanation of symbols]

1 ... Valve seat, 2 ... Needle valve, 3 ... Suck volume, 6a, 6b, 9a, 9b ... Orifice, 7 ...
Spray

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Hisao Sakai, 1-4-1, Chuo, Wako, Saitama Stock Company Honda R & D Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A fuel injection valve adapted to inject fuel from an orifice, wherein a plurality of the orifices are formed, and the plurality of orifices are close to each other or separated from each other toward the downstream side of the jet flow. A fuel injection valve that is suitable for. 2. The fuel injection valve according to claim 1, wherein an intersection of center lines of the plurality of orifices is deviated from a center of a suck volume located upstream of the orifices. .. 3. The fuel injection valve according to claim 1, wherein the plurality of orifices are arranged such that their center lines are aligned with each other.