JP3365147B2 - Fuel injection valve for internal combustion engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a fuel injection valve for an internal combustion engine suitable for a direct injection type gasoline engine or the like, and more particularly to an improvement of the fuel injection valve for imparting a swirling component to the spray.

[0002]

2. Description of the Related Art A fuel injection valve, which is a so-called spiral injection valve, is known in which a swirl component is imparted to the spray by guiding the fuel spirally upstream of the injection hole. For example, in Japanese Patent Laid-Open No. 60-142051, a spiral guide groove is formed in the tip of a valve body that slides in the body, and when the valve body lifts, the valve body and the inner circumference of the body are The fuel injection valve is configured to give a swirl component to the fuel flowing between the fuel injection valve and the fuel injection valve. In this example, the injection hole opening at the tip of the body is formed so as to have a perfect circular cross section along the center line of the injection valve. Therefore, the opening edge at the tip of the injection hole becomes a true circle along the plane orthogonal to the center line of the injection hole.

[0003]

In such a conventional configuration, the spraying direction of the spray is limited to the direction along the center line of the injection valve, and the spray cross-sectional shape is a perfect circle (more specifically, a perfect circle). It becomes a ring). Therefore,
For example, if it is applied to a direct injection type gasoline engine in which a fuel injection valve is arranged toward the inside of a cylinder, it is difficult to avoid fuel from adhering to the intake valve.

If the cross-sectional shape of the injection hole is changed, the spray cross-sectional shape can be obtained in a shape other than a perfect circle, but it is very difficult to process the injection hole having a shape other than a perfect circle.

Further, Japanese Patent Laid-Open No. 60-261975 discloses a spiral type injection valve in which injection holes are formed obliquely from a sack portion at the tip of the injection valve. Although the injection direction can be arbitrarily set, the swirl component is weakened, and it cannot be effectively used for atomizing the fuel. Moreover, the spray cross-sectional shape is still limited to a perfect circle.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a valve body is slidably arranged along an axial direction in a body having a nozzle hole having a perfect circular cross section at its tip, and the outer circumference of the valve body is In a fuel injection valve of an internal combustion engine, which is provided with a swirling flow generating means for imparting a swirling component to fuel with an inner circumference of a body, the injection hole has a base end portion that is open on a center line of the injection valve and a tip end. The opening edge of the opening is seen in the first cross section including the injection hole center line
Is characterized in that along the two-dimensional curved curvilinear when viewed in a second cross section perpendicular forms a straight line perpendicular to the first cross-sectional plane該噴hole center line and.

[0007] According to a second aspect of the invention, the opening edge of the distal opening, the first cross-sectional surface forms a sloped straight line relative to the first view in cross-section when該噴hole center lines including injection hole centerline It is characterized in that it is along a curved two-dimensional curved surface when viewed in a second cross section orthogonal to.

According to a third aspect of the invention, the center line of the injection hole is ejected.
It is characterized in that it coincides with the center line of the firing valve .

The invention of claim 4 is seen in the second section.
The curve at this time is symmetrical with respect to the center line of the injection hole.

The invention of claim 5 is seen in the above second cross section.
The curve at this time is asymmetric with respect to the center line of the injection hole.

According to the invention of claim 6, the spray is directed in the left-right direction.
Flatly tip opening edge of the nozzle hole to diffuse sets the shape of the surface along and toward the cylinder so as to inject spray through between the valve head and the cylinder side wall of the pair of intake valves It is characterized by being placed.

Further, in the invention of claim 7, the spray is upward and downward.
The shape of the surface along which the tip opening edge of the injection hole follows is set so as to spread flatly in the same direction , and it is arranged toward the inside of the cylinder so as to inject the spray through between the valve heads of the pair of intake valves. Is characterized by.

Further, in the invention of claim 8, the fuel injection valve is arranged in the cylinder head so as to directly inject the fuel into the combustion chamber, and the tip end surface of the body facing the combustion chamber is
It is characterized in that it is formed so as to be inclined with respect to the center line of the injection hole so as to be substantially flush with the wall surface of the surrounding combustion chamber, and the injection hole is opened in this inclined surface.

[0014]

The fuel flowing into the injection hole has a flow velocity component in the axial direction of the injection hole and a flow velocity component in the swirling direction. Therefore, as described above, when the opening edge of the injection hole tip is not along the plane orthogonal to the injection hole center line, the spray spreads unevenly at each point of the opening edge of the injection hole tip. Become. Therefore, even if the injection hole has a true circular cross-sectional shape, the spray cross-sectional shape is non-circular. Alternatively, the spray is formed obliquely to the center line of the injection hole while the spray cross-sectional shape is circular. Therefore, even when the injection hole center line is made to coincide with the injection valve center line as in claim 3 , the spray can be formed in a direction other than the injection valve center line. When the center line of the injection hole and the center line of the injection valve coincide with each other as in claim 3 , the swirl component imparted on the upstream side of the injection hole is more effectively used.

Particularly, in the structure of claim 1 , the spray cross-sectional shape is flat, that is, elliptical.

Here, as in claim 4, the second cross section is provided.
If the curve when viewed in Fig. 2 is symmetrical with respect to the injection hole center line, the direction of spraying is along the injection hole center line, and the second cross section as in claim 5 Saw in
If the curve at this time is left-right asymmetrical with the center line of the injection hole as the center, the direction of spray is oblique to the center line of the injection hole.

According to the second aspect of the invention, the direction of the spray is oblique with respect to the center line of the injection hole, and the spray cross section is flat or elliptical.

According to the sixth aspect of the invention, the spray is formed in a flat fan shape between the valve heads of the pair of intake valves and the side wall surface of the cylinder, and the adhesion to the intake valves is suppressed.

Further, according to the structure of claim 7, the spray is formed in a flat fan shape between the valve heads of the pair of intake valves, and the adhesion to the intake valves is similarly suppressed.

According to the eighth aspect of the invention, there is no step between the tip of the body of the fuel injection valve and the peripheral wall surface of the combustion chamber, and there is no recess for accumulating the injected fuel.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

First, the basics of the present invention will be described with reference to FIGS.
The basic configuration and principle will be described. 1 and 2 show the above end portion of the fuel injection valve 1 according to the present invention. Here, FIG. 1 and FIG. 2 are cross sections taken along two planes that include the injection valve center line L and are orthogonal to each other, and are X- shown in FIG.
A cross section along the X plane is shown in FIG. 1, and a cross section along the YY plane is shown in FIG.

The body 2 of the injection valve 1 has an injection hole 3 which will be described later formed at the tip end thereof, and a conical seat surface 4 is formed on the upstream side thereof. The valve body 5 is accommodated in the body 2 so as to be slidable in the axial direction. This valve body 5
Has a large diameter portion 5b on the tip side of the shaft portion 5a, and a conical surface 5c at the tip of the shaft portion 5a is seated on the seat surface 4 to seal the injection hole 3. Strictly speaking, the conical surface 5
The seat line 6 portion in c contacts the seat surface 4. The valve body 5 is lifted by an appropriate means such as a solenoid.

A small gap is secured between the outer peripheral surface of the large diameter portion 5b and the inner peripheral surface of the body 2, and the large diameter portion 5 is provided.
A guide groove 7 that is spirally inclined is formed on the outer peripheral surface as a swirling flow generating means. The guide grooves 7 are arranged at a plurality of locations in the circumferential direction, for example, four locations. By this guide groove 7, when fuel flows from the upstream side toward the injection hole 3,
A swirl component is added to the fuel. The axial center of the seat surface 4 and the valve body 5 is the injection valve center line L.

In this reference example, the injection holes 3 are formed along the center line L of the injection valve. That is, the center line of the injection hole 3 coincides with the injection valve center line L. Therefore, its proximal end 3
The opening a is on the injection valve center line L. The tip surface 8 of the body 2 at which the tip of the injection hole 3 is open is formed in a plane inclined with respect to the center line of the injection hole 3 (the injection valve center line L). Specifically, as is clear from FIG. 1 and FIG. 2, it is inclined along the XX plane, and in the YY plane, the injection valve center line L
Is orthogonal to. Further, since the injection hole 3 is opened in the inclined tip surface 8, the tip opening edge 3b of the injection hole 3 is located along the tip surface 8 which is the inclined plane.

[0026] In the configuration described above, the valve body 5 is lifted, the fuel flows into the injection hole 3 while turning, and is ejected from the opening of the tip, in this case, the opening edge 3
Since the position of b is not along the plane orthogonal to the center line of the injection hole 3, the direction of spraying is not along the center line of the injection hole 3 and is inclined.

FIG. 4 is an explanatory view for explaining this action. The cross section of the injection hole 3 portion is shown in the upper part and the opening edge 3 of the injection hole 3 is shown in the lower part.
The projections of b viewed from the three-axis directions of the injection holes are shown in comparison with each other. Since the fuel spirally flows into the injection hole 3, when the flow line of the flow is drawn from the points A, B, C and D at the same height position where the conical seat surface 4 and the injection hole 3 are connected. , The opening edge 3b has velocity components reaching the points a, b, c and d, respectively, and heading in the directions indicated by arrows S _a , S _b , S _c and S _d . Therefore, as a whole, the spray is bent in the direction indicated by the arrow S _0, that is, in the direction in which the length from the inlet of the injection hole 3 to the opening edge 3b is shorter. In addition to such a geometrical principle, the spray direction is bent due to the influence of fuel viscosity.

Therefore, in the above example , the center line of the spray that spreads in a substantially conical shape is inclined along the XX plane, as indicated by the symbol F in FIG. Further, FIG. 5 shows a spray cross-sectional shape on a plane AA which is a plane orthogonal to the spray center line F. As shown in FIG. 5, the spray cross-sectional shape itself maintains a substantially perfect circle.

[0029] In this way, above Ki構 formed, the fuel injection valve 1
Even when the mounting posture of the is restricted due to the relationship with other parts, the spray can be formed in a desired direction.

In the illustrated example, the entire tip surface 8 of the injection valve 1 is shown as an inclined surface for easy understanding, but the portion surrounding the opening edge 3b of the injection hole 3 has the same inclined surface. If so, the same effect can be obtained.

Next, FIGS. 6 and 7 show a first embodiment of the present invention. Here, FIG. 6 shows a cross section along the XX plane described above, and FIG. 7 shows a cross section along the YY plane. In this embodiment, the tip surface 8 of the body 2 in which the injection hole 3 is open has a two-dimensional curved surface orthogonal to the center line of the injection hole 3 (injection valve center line L). Specifically, as apparent from FIGS. 6 and 7,
Has a curved cylindrical surface along the XX plane, and
On the YY plane, it is orthogonal to the injection valve center line L. The cylindrical surface has a shape that bulges toward the tip of the injection valve 1, and the center point of the arc is on the injection valve center line L. That is, it is symmetrical in the XX plane of FIG. And since the injection hole 3 is opening here, the front end opening edge 3b of the injection hole 3 is located along this cylindrical surface.

As in the case of the above-described reference example, only the portion including the injection hole 3 needs to have such a surface shape.

According to the configuration of the first embodiment, the spray tends to spread to the left and right along the XX plane by the action similar to the principle described in FIG. Further, since the action of partially bending the spray occurs symmetrically, the center line of the spray coincides with the center line of the injection hole 3. That is, the injection direction does not bend. Then, as shown in FIG. 8, the spray cross-sectional shape on the plane A-A which is a plane orthogonal to the spray center line is widened to the left and right as described above. It becomes a flat shape, that is, an elliptical shape.

As described above, in the configuration of the above-described embodiment, the spray cross-sectional shape can be flattened, and fuel injection can be performed in consideration of the suppression of fuel wall flow. Further, if the spray cross-sectional area is the same as in the case where the spray cross-sectional shape is a perfect circle, the spray angle in the major axis becomes wider, which is also advantageous in atomizing the fuel.

Next, FIGS. 9 and 10 show a second embodiment of the present invention. Here, FIG. 9 shows a cross section along the above-mentioned XX plane, and FIG. 10 shows a cross section along the YY plane. In this embodiment, the tip surface 8 of the body 2 in which the injection hole 3 opens is
Similar to the first embodiment, a two-dimensional curved surface that is orthogonal to the center line of the injection hole 3 (the center line L of the injection valve) in the YY plane , specifically X-
It forms a curved cylindrical surface along the X plane, but the center point of the arc is off the injection valve center line L, and as a result,
In the XX plane of FIG. 9, it is left-right asymmetric. And since the injection hole 3 is opening here, the front end opening edge 3b of the injection hole 3 is located along this asymmetric cylindrical surface.

[0036] Incidentally, the only portion including the nozzle hole 3 it is sufficient to form such a surface shape is the same as in the case of actual施例described above.

According to the structure of the second embodiment, as in the case of the first embodiment, the spray tends to spread to the left and right along the XX plane, and at the same time, as in the case of FIGS. 1 to 4. Then, the entire spray is inclined along the XX plane. That is, the spray center line F is
The direction is as shown in FIG. And this spray center line F
As shown in FIG. 11, the spray cross-sectional shape on the plane AA which is a plane orthogonal to the plane X-X is similar to that of the first embodiment.
The shape is flattened along the surface, that is, elliptical.

Next, FIGS. 12 and 13 show a third embodiment of the present invention. Here, FIG. 12 shows a cross section along the above-mentioned XX plane, and FIG. 13 shows a cross section along the YY plane. In this embodiment, the tip end surface 8 of the body 2 in which the injection hole 3 is open is a concave surface, which is the reverse of the second embodiment. That is , a two-dimensional curved surface orthogonal to the center line of the injection hole 3 (center line of the injection valve L) in the YY plane , specifically, a cylindrical concave surface curved along the XX plane is formed. Further, the center point of the arc is off the injection valve center line L, and as a result, it is asymmetrical in the XX plane.

According to the structure of the third embodiment, since the action of the cylindrical surface acts in the opposite manner to the second embodiment, the spray is X-.
It tends to be compressed left and right along the X plane, and at the same time, the entire spray is inclined along the XX plane, as in the example of FIGS . That is, the spray center line F is in the direction shown in FIG. Then, as shown in FIG. 14, the spray cross-sectional shape on the plane AA which is a plane orthogonal to the spray center line F has an elliptical shape in which the direction along the XX plane has a short diameter. If the front end surface 8 is a concave surface as in this embodiment, the workability in machining becomes good.

Next, FIGS. 15 and 16 show a fourth embodiment of the present invention. Here, FIG. 15 shows a cross section along the above-mentioned XX plane, and FIG. 16 shows a cross section along the YY plane. In this embodiment, the tip surface 8 of the body 2 in which the injection hole 3 is open has a two-dimensional curved surface inclined with respect to the center line of the injection hole 3 (injection valve center line L). Specifically, as is clear from FIG. 16, a cylindrical surface curved along the YY plane is formed, and in the XX plane, as shown in FIG. It is inclined with respect to it. The cylindrical surface has a shape that bulges toward the tip of the injection valve 1, and the center point of the arc is on the injection valve center line L. That is, FIG.
The Y-Y plane 6 is bilaterally symmetric. And since the injection hole 3 is opening here, the front end opening edge 3b of the injection hole 3 is located along this cylindrical surface.

As in the case of each of the above-described embodiments, it is sufficient that only the portion including the injection hole 3 has such a surface shape.

According to the structure of the fourth embodiment, the action of the cylindrical surface causes the spray to spread to the left and right along the YY plane, and at the same time, similarly to the example of FIGS. 1 to 4 , The entire spray is tilted along the XX plane. That is, the spray center line F is in the direction shown in FIG. As shown in FIG. 17, the spray cross-sectional shape on the plane AA, which is a plane orthogonal to the spray center line F, has an elliptical shape that is elongated and flat along the plane YY.

Next, FIGS. 18 and 19 show reference examples. Here, FIG. 18 is a cross-sectional view taken along the line X-X described above.
Reference numeral 9 indicates a cross section along the YY plane. In this reference example, the injection hole 3 is inclined with respect to the injection valve center line L along the XX plane. However, the base end portion 3a of the injection hole 3 is open on the injection valve center line L. The tip end surface 8 of the body 2 in which the injection hole 3 is open forms a flat surface further inclined with respect to the center line M of the injection hole 3 along the XX plane. Since the injection hole 3 is open here, the tip opening edge 3b of the injection hole 3 is
It is located along this inclined surface.

As in the case of each of the above-mentioned embodiments, it is sufficient that only the portion including the injection hole 3 has such a surface shape.

According to the construction of this reference example, since the injection hole 3 itself is inclined with respect to the injection valve center line L, in addition to the inclination of the spray in that direction, the inclination of the tip opening edge 3b causes Since the spray is bent with respect to the center line M of the injection hole as in the first embodiment, the spray can be bent at a very large angle when the center line L of the injection valve is used as a reference. The spray cross-sectional shape on the plane AA orthogonal to the spray center line F is kept substantially circular as shown in FIG. Also,
Example of this, although the nozzle hole 3 is inclined, since the base end portion 3a swirling flow of fuel flows is located on the injection valve center line L, the fuel while maintaining strong swirling component injection To be done.

Although some embodiments have been described above, the present invention is not limited to these embodiments, and the tip end opening edge 3b of the injection hole 3 is not limited thereto.
By appropriately setting the shape of the surface along which the spray is formed, the spray can be formed in the desired spray cross-sectional shape in the desired direction.

Next, FIGS. 21 and 22 show an application example of the fuel injection valve 1 according to the present invention to an internal combustion engine. This embodiment is an example in which the fuel injection valve 1 of the present invention is used in a direct injection gasoline engine, and the fuel is injected so as to inject the fuel into the cylinder 12 below the intake port 11 of the cylinder head 10. A valve 1 is arranged. The fuel injection valve 1 has, for example, a configuration similar to that of the third embodiment described above, and the spray f is directed in a direction inclined downward with respect to the injection valve center line L, and the spray f is flat in the left-right direction. The shape of the surface along which the tip opening edge 3b of the injection hole 3 extends is set so as to diffuse. The fan-shaped spray f spreads on the valve heads 13 a of the pair of intake valves 13 and the cylinder 1.
It goes to the top surface of the piston 14 through the space between the two side wall surfaces.

With this structure, the valve head 1
The fuel can be injected in a relatively wide range while suppressing the adhesion of the fuel to 3a.

The fuel remaining in the volume of the injection hole 3 after the valve body 5 is seated is injected so as to be pushed out by the injected fuel in the next injection. The spray droplets of this initial jet that occur prior to the regular jet have a larger particle size and stronger penetration force than the spray droplets of the regular jet. Therefore, if the spray droplets of the initial injection collide with the top surface of the piston 14 at a large angle, the spray droplets are largely repelled on the top surface of the piston 14, and the repelled spray droplets adhere to the upper wall surface of the combustion chamber to cause exhaust emission. It may make it worse. However, in this embodiment, the normal injection is the valve head 13a.
To avoid this, the fuel is injected at a large angle with respect to the top surface of the piston 14, but the fuel of the initial injection does not have a swirling component, so the center line of the injection hole 3 (that is, the injection valve center line L).
Go straight up and collide with the top surface of the piston 14 at a small angle. Therefore, the amount of rebound on the top surface of the piston 14 is reduced, and the exhaust emission is not deteriorated.

23 and 24 show different application examples of the fuel injection valve 1 according to the present invention to an internal combustion engine. This embodiment is also an example in which the fuel injection valve 1 of the present invention is used for a direct injection gasoline engine, and the fuel is injected so as to be injected into the cylinder 12 below the intake port 11 of the cylinder head 10. The injection valve 1 is arranged. The fuel injection valve 1 has a configuration similar to that of the above-described first embodiment or second embodiment, for example, and the tip opening edge 3b of the injection hole 3 is arranged so that the spray f is spread flatly in the vertical direction. The shape of the surface is set. The fan-shaped spray f that spreads vertically is directed to the top surface of the piston 14 through the space between the valve heads 13a of the pair of intake valves 13.

With this structure, it is possible to prevent the fuel from adhering to the valve head 13a as in the above embodiment.

Further, FIG. 25 shows an example of a mounting structure of the fuel injection valve 1 according to the present invention to an internal combustion engine,
The fuel injection valve 1 is a direct injection type gasoline engine and is laterally mounted on the cylinder head 10 so as to directly inject fuel toward the combustion chamber 21. In this example, the fuel injection valve 1 has the same structure as the example shown in FIGS. 1 and 2, and the tip end surface 8 of the body 2 in which the injection hole 3 opens is an inclined surface. The small diameter portion 2a at the tip of the body 2 having the inclined tip surface 8 is fitted into the through hole 22 formed in the cylinder head 10 and the combustion chamber 21.
The front end surface 8 thereof facing the surface is substantially flush with the wall surface 21a of the surrounding combustion chamber 21. In this example, the combustion chamber 2
1 is configured as a so-called pent roof type, and the wall surface 21a of the portion having the through hole 22 is an inclined flat surface. Further, in this example, the lower edge of the through hole 22 and the lower edge of the small diameter portion 21a are aligned with each other without a step, whereas the small diameter portion 21a is slightly retracted at the upper edge portion.

Further, FIG. 26 shows an embodiment in which the tip end surface 8 is made to completely coincide with the wall surface 21a of the combustion chamber 21.

According to the embodiment shown in FIGS. 25 and 26, the end of the through hole 22 into which the fuel injection valve 1 is fitted, that is, the portion open to the combustion chamber 21 does not remain as a recess. The injected fuel does not easily adhere and remain. Therefore, it is possible to prevent carbon from being deposited at the opening of the through hole 22.

Even if the front end surface 8 of the fuel injection valve 1 is not flat, the same effect can be obtained if it is configured to be substantially flush with the surrounding wall surface 21a. Also,
When the shape of the combustion chamber 21 is other than the pent roof type, for example, a hemispherical type is also applicable.

[0056]

As is apparent from the above description, the fuel injection valve according to the present invention is not limited to the axial direction of the injection hole or the cross-sectional shape of the injection hole, and the desired spray forming direction or spray cross-sectional shape is desired. Direction and desired cross-sectional shape.
Therefore, for example, it is possible to prevent the spray from adhering to unnecessary portions. Further, since the base end portion of the injection hole is located on the center line of the injection valve, it is possible to perform injection without weakening the swirl component.

Particularly, according to the structure of claim 1, the spray cross-sectional shape is
The shape can be flat or elliptical .

According to the structure of claim 2, the direction of spraying
Is oblique to the center line of the injection hole, and at the same time, the spray cross-sectional shape is
The shape can be flat or elliptical.

Further , as in claim 3, the injection hole center line and the injection
If it coincides with the valve center line, it was given upstream of the injection hole.
The turning component can be used more effectively.

[0060]

Further, by constructing as in claim 6 or claim 7, in the direct injection type gasoline engine,
Adhesion of fuel to the intake valve can be suppressed.

Further, according to the eighth aspect of the present invention, no recess is formed at the tip of the fuel injection valve located on the wall surface of the combustion chamber, and it is possible to prevent the injected fuel from adhering and remaining, and thus carbon from being deposited.

[Brief description of drawings]

FIG. 1 is a fuel injection valve XX as a reference example of the present invention.
Sectional drawing along the surface.

FIG. 2 is a sectional view taken along the YY plane, which is also orthogonal to the XX plane .

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is an explanatory diagram for explaining the principle that the spray is bent.

5 is a cross-sectional view showing a spray cross-sectional shape on the AA plane of FIG.

FIG. 6 is an X- of the fuel injection valve according to the first embodiment of the present invention.
Sectional drawing which followed the X surface.

FIG. 7 is a sectional view of the fuel injection valve according to the first embodiment, taken along the plane YY.

FIG. 8 is a cross-sectional view showing a spray cross-sectional shape on the plane AA of FIG.

FIG. 9 is an X- of the fuel injection valve according to the second embodiment of the present invention.
Sectional drawing which followed the X surface.

FIG. 10 is also a Y-Y of the fuel injection valve according to the second embodiment.
Sectional drawing along the surface.

11 is a cross-sectional view showing a spray cross-sectional shape on the AA plane of FIG.

FIG. 12: X of the fuel injection valve according to the third embodiment of the present invention
-A sectional view taken along the X-plane.

FIG. 13 is also a Y-Y of the fuel injection valve according to the third embodiment.
Sectional drawing along the surface.

14 is a cross-sectional view showing a spray cross-sectional shape on the AA plane of FIG.

FIG. 15 is an X of the fuel injection valve according to the fourth embodiment of the present invention.
-A sectional view taken along the X-plane.

FIG. 16 is a Y-Y of the fuel injection valve according to the fourth embodiment as well.
Sectional drawing along the surface.

FIG. 17 is a cross-sectional view showing a spray cross-sectional shape on the AA plane of FIG.

FIG. 18 is a sectional view taken along the line XX of the reference example of the present invention.

Figure 19 is a cross-sectional view taken along the same Ku Y -Y plane.

20 is a cross-sectional view showing a spray cross-sectional shape on the AA plane of FIG.

FIG. 21 is a structural explanatory view showing an example in which the fuel injection valve according to the present invention is applied to a direct injection type gasoline engine.

FIG. 22 is an explanatory view of the configuration similarly seen from the cylinder axis direction.

FIG. 23 is a structural explanatory view showing another example in which the fuel injection valve according to the present invention is applied to a direct injection type gasoline engine.

FIG. 24 is an explanatory view of the configuration when viewed from the cylinder axis direction.

FIG. 25 is a cross-sectional view of a main part of an internal combustion engine showing an example of a mounting structure of a fuel injection valve according to the present invention to an internal combustion engine.

FIG. 26 is a cross-sectional view of a main part of an internal combustion engine showing another example of a structure for mounting a fuel injection valve on an internal combustion engine according to the present invention.

[Explanation of symbols]

1 ... Fuel injection valve 2 ... Body 3 ... Nozzle 7 ... Guide groove 8 ... Tip surface 13 ... Intake valve 21a ... wall surface of combustion chamber

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Claims (8)

(57) [Claims] 1. A valve body is slidably arranged along an axial direction in a body having a nozzle hole having a perfect circular cross section at its tip, and fuel is provided between the outer circumference of the valve body and the inner circumference of the body. In a fuel injection valve for an internal combustion engine having a swirl flow generating means for imparting a swirl component to the injection hole, the base end of the injection hole is open on the center line of the injection valve, and the opening edge of the tip opening is First cut including the hole center line
When viewed in a plane, it forms a straight line orthogonal to the center line of the injection hole,
The fuel injection valve of an internal combustion engine, characterized in that along the two-dimensional curved curvilinear when viewed in a second cross section perpendicular to the sectional plane of the. 2. A valve body is slidably arranged in the axial direction in a body having a nozzle hole having a perfect circular cross section opened at a tip end thereof, and a fuel is provided between the outer circumference of the valve body and the inner circumference of the body. In a fuel injection valve for an internal combustion engine having a swirl flow generating means for imparting a swirl component to the injection hole, the base end of the injection hole is open on the center line of the injection valve, and the opening edge of the tip opening is First cut including the hole center line
Of an internal combustion engine, characterized in that along the two-dimensional curved surface which forms a the curve viewed in the second cross section orthogonal to the first cross-sectional surface forms a sloping straight line with respect該噴hole center line when viewed in plane Fuel injection valve. 3. A fuel injection valve according to claim 1 or the internal combustion engine to Claim 2 serial <br/> mounting, characterized in that the center line of the injection hole is coincident with the injection valve center line. 4. The internal combustion engine according to claim 1, wherein the curve when viewed in the second cross section is symmetrical with respect to the injection hole center line. Fuel injection valve. 5. The internal combustion engine according to claim 1, wherein the curve when viewed in the second cross section is asymmetric with respect to the injection hole center line. Fuel injection valve. 6. The shape of the surface along which the tip opening edge of the injection hole follows is set so that the spray diffuses flat in the left-right direction , and the spray is passed through between the valve heads of the pair of intake valves and the cylinder side wall surface. The fuel injection valve for an internal combustion engine according to claim 1 or 2, wherein the fuel injection valve is arranged so as to be injected into a cylinder. 7. A cylinder in which the shape of the surface along which the tip opening edge of the injection hole follows is set so that the spray diffuses flatly in the vertical direction , and the spray is injected through between the valve heads of the pair of intake valves. The fuel injection valve for an internal combustion engine according to claim 1 or 2, wherein the fuel injection valve is disposed inward. 8. The injection hole center line is arranged so that the fuel is directly injected into the combustion chamber, and the tip end surface of the body facing the combustion chamber is substantially flush with the peripheral wall surface of the combustion chamber. The fuel injection valve for an internal combustion engine according to claim 1, wherein the fuel injection valve is formed so as to be inclined with respect to the inclined surface, and an injection hole is opened in the inclined surface.