DESCRIPTION
Title of Invention: FUEL INJECTION VALVE
Technical Field
[0001]
The present invention relates to a fuel injection valve used in supplying fuel to an automobile internal combustion engine or the like. Background Art
[0002]
In response to a strengthening of exhaust gas regulations with respect to an automobile internal combustion engine and the like in recent years, there is a demand for a reduction in droplet size in atomized fuel injected from a fuel injection valve, and various investigations relating to methods of achieving a reduction in droplet size by utilizing swirl flow have been carried out.
Existing technology is such that when fuel is injected in a direction inclined to a central axial line of a fuel injection valve, a plate-form member in which a fuel injection hole is opened is provided on a downstream side of a valve seat that a valve body is in contact with or separated from, and a bottom face of a swirl chamber of the plate-form member is configured so as to be perpendicular to the fuel injection

direction (for example, refer to Patent Document 1). Citation List Patent Literature
[0003]
Patent Document 1: JP-A-2015-169084 Summary of Invention Technical Problem
[0004]
A configuration of an existing fuel injection valve is such that a bottom face of a swirl chamber needs to be formed inclined to a face that is perpendicular to an axis, processing difficulty is greater than when forming the bottom face of the swirl chamber to be perpendicular to the axis, and there is concern that productivity is low.
The invention, having been contrived in order to resolve the heretofore described kind of problem, has an object of providing a fuel injection valve such that fuel injection characteristics are good, and productivity is high, when fuel is injected in a direction inclined to an axis of the fuel injection valve. Solution to Problem
[0005]
A fuel injection valve according to the invention includes a fuel supply unit that supplies fuel in a channel axis direction, and an injection hole plate that is provided

on a downstream side of the fuel supply unit, causes fuel supplied from the fuel supply unit to divide into multiple directions in a plane perpendicular to the axis, thereby guiding the fuel into a swirl chamber that imparts a swirling force to the fuel, and injects the fuel from an injection hole bored in a bottom face of the swirl chamber, which is perpendicular to the axis, and inclined with respect to the axis, wherein the injection hole is such that a center of an entrance portion into which fuel is caused to flow is offset from a fuel swirl center of the swirl chamber, and a center of an exit portion through which fuel is ejected is provided in proximity to the swirl center. Advantageous Effects of Invention
[0006]
According to the fuel injection valve of the invention, processing is easy because a bottom face of a swirl chamber is provided perpendicular to an axis, and a center of an exit portion of an injection hole is offset so as to be nearer a swirl center, because of which a thickness of a liquid fuel film that flows down in contact with an inner peripheral face in a vicinity of the exit portion of the injection hole, centered on a cavity portion of the fuel swirl center occurring in the injection hole, can be equalized in a circumferential direction, and fuel atomization characteristics can be improved.

Brief Description of Drawings
[0007]
[Fig. 1] Fig. 1 is a sectional view in an axial direction of a fuel injection valve according to a first embodiment of the invention.
[Fig. 2] Fig. 2 is a sectional view showing an example of a disposition of the fuel injection valve of Fig. 1 in an intake port.
[Figs. 3A and 3B] Fig. 3A is an enlarged sectional view of a downstream portion of the fuel injection valve of Fig. 1, and Fig. 3B is a plan view along an A-A line of Fig. 3A.
[Fig. 4] Fig. 4 is an enlarged plan view of a branched channel of an injection hole plate of Fig. 3B.
[Figs. 5A and 5B] Fig. 5A is an enlarged view of a region Al of Fig. 4, and Fig. 5B is a sectional view along a B-B line of Fig. 5A.
[Figs. 6A and 6B] Fig. 6A is an enlarged view showing a fuel flow in the region Al of Fig. 4, and Fig. 6B is a sectional view along a C-C line of Fig. 6A.
[Fig. 7] Fig. 7 is an enlarged view of a region A2 of Fig. 4.
[Fig. 8] Fig. 8 is a main portion sectional view of the fuel injection valve according to a second embodiment of the invention.
[Fig. 9] Fig. 9 is a plan view showing an H-form branched

channel of the fuel injection valve according to a third embodiment of the invention.
[Fig. 10] Fig. 10 is a plan view showing an I-form branched channel of the fuel injection valve according to a fourth embodiment of the invention.
[Fig. 11] Fig. 11 is a plan view showing an X-form branched channel of the fuel injection valve according to a fifth embodiment of the invention.
[Figs. 12A and 12B] Fig. 12A is an enlarged plan view of a swirl chamber of a fuel injection valve that is a comparative example, and Fig. 12B is a sectional view along a D-D line of Fig. 12A. Description of Embodiments
[0008] First Embodiment
Hereafter, a fuel injection valve 1 in a first embodiment of the invention will be described, using Fig. 1 to Fig. 7.
Fig. 1 is a sectional view in an axial (central axial line) direction of the fuel injection valve 1, and Fig. 2 is a sectional view of an intake port 22 in which fuel injected from the fuel injection valve 1 becomes a spray and diffuses. As shown in Fig. 1, the fuel injection valve 1 according to the invention is such that fuel is supplied in the axial direction from a fuel supply unit la positioned in an upstream portion to an injection hole plate 13 positioned in a downstream

portion. Further, a configuration is such that a fuel channel is divided into multiple fuel channels in the injection hole plate 13, and fuel is injected in multiple directions, for example two directions, as shown in Fig. 2.
[0009]
Hereafter, the fuel injection valve 1 will be described in more detail.
As shown in Fig. 1, the fuel injection valve 1 according to the first embodiment of the invention is of a configuration mainly including a solenoid device 4, a housing 5, which is a yoke portion of a magnetic circuit, a core 6, which is a fixed iron core portion of the magnetic circuit, a coil 7, an armature 8, which is a movable iron core portion of the magnetic circuit, and a valve device 9. The valve device 9 is configured of a valve body 10, a valve main body 11, and a valve seat 12. The valve main body 11 is welded after being press-fitted into an outer diameter portion of the core 6, and the armature 8 is welded after being press-fitted into the valve body 10. The injection hole plate 13 is joined to the valve seat 12. A fuel channel of the fuel injection valve 1 as far as the injection hole plate 13 is assumed to be the fuel supply unit la. A multiple of injection holes 14 (fuel injection holes) are provided in the injection hole plate 13 so as to penetrate the injection hole plate 13 in a plate thickness direction.
[0010]

Next, an operation of the fuel injection valve 1 will be described.
When an operation signal is sent to a drive circuit of the fuel injection valve 1 from an engine control device, the coil 7 is energized by a current, and a magnetic flux is generated in the magnetic circuit configured of the armature 8, the core 6, the housing 5, and the valve main body 11. The armature 8 is suctioned to the core 6 side by the magnetic flux, and the valve body 10, which is of a structure integrated with the armature 8, separates from a valve seat portion, whereby a gap is formed (an opened valve state occurs) . When the opened valve state occurs, fuel is injected from a chamfered portion 15a of a ball 15 welded to a leading end portion of the valve body 10, through the gap between the valve seat 12 and the valve body 10, and into an engine intake passage via the multiple of injection holes 14.
[0011]
Next, when an operation stopping signal is sent to the drive circuit of the fuel injection valve 1 from the engine control device, the energizing of the coil 7 by the current stops, the magnetic flux in the magnetic circuit decreases, and the gap between the valve body 10 and the valve seat 12 closes (a closed valve state occurs) owing to a compression spring 16 that is pushing the valve body 10 in a valve closing direction. When the closed valve state occurs, the fuel

injection finishes.
As the valve body 10 is integrated with the armature 8, an armature outer face portion 8a slides along a guide portion of the valve main body 11 in accompaniment to the valve opening and closing operation, and an armature upper face portion 8b comes into contact with a lower face of the core 6 in the opened valve state.
[0012]
As shown in Fig. 2, the fuel injection valve 1 according to the first embodiment of the invention is attached farther to an upstream side than a position in which the intake port 22, which introduces intake air into an internal combustion engine, divides into a fork. An intake valve 23 is provided on a downstream side of the intake port 22 divided into a fork, and atomized fuel 21 is injected from the multiple of injection holes 14 provided in the one injection hole plate 13 toward two intake valves 23 provided separated from each other.
[0013]
An enlarged sectional view of the valve seat 12 and the injection hole plate 13 in the downstream portion of the fuel injection valve of Fig. 1 is shown in Fig. 3A, and a plan view along an A-A line of Fig. 3A of a branched channel 18 of the injection hole plate 13 provided in a cross form is shown in Fig. 3B. A center of a valve seat aperture portion 12b, which forms an opened end of the valve seat 12, is provided positioned

to coincide with a center of the cross-form branched channel 18 of the injection hole plate 13.
Also, an enlarged plan view of the branched channel of the injection hole plate 13 of Fig. 3B is shown in Fig. 4.
As shown in Figs. 3A, 3B and Fig. 4, an upstream side end face of the injection hole plate 13 is recessed so as to be of a constant depth, and a multiple of swirl chambers 17, which impart a swirling force to fuel, and the branched channel 18, which introduces fuel into the swirl chamber 17, are formed during a procedure of forming the recessed portion. Further, bottom faces of the swirl chamber 17 and the branched channel 18 are provided vertically to a central axis of the fuel injection valve 1 so as to be perpendicular to the axis.
[0014]
The injection hole 14 is provided inclined in one of two directions, which are fuel injection directions inclined with respect to the axis of the fuel injection valve 1. Further, in a plane vertical to the axis, an entrance portion of the injection hole 14 is provided offset with respect to a center of the swirl chamber 17 (a fuel swirl center 17a) in a direction opposite to a direction of inclination from the entrance portion of the injection hole 14 toward an exit portion. In Fig. 4, swirl chamber formation portions indicated by a region Al and a region A4 are such that the entrance portion of the injection hole 14 is offset to the right side of the drawing

from a swirl center position, and fuel is injected to the left side of the drawing, while swirl chamber formation portions indicated by a region A2 and a region A3 are such that the entrance portion of the injection hole 14 is offset to the left side of the drawing from a fuel swirl center position, and fuel is injected to the right side of the drawing.
That is, of the four injection holes 14 provided in the injection hole plate 13, the entrance portion offset direction of two injection holes 14 is provided so as to be parallel to the direction in which the branched channel 18 introduces fuel into the swirl chamber 17, and the entrance portion offset direction of the remaining two injection holes 14 is provided so as to be at an angle (for example, so as to form a right angle) with respect to the direction in which the branched channel 18 introduces fuel into the swirl chamber 17.
[0015]
Furthermore, as shown in an enlarged view of the region Al of Fig. 4 in Fig. 5A and a sectional view along a B-B line of Fig. 5A in Fig. 5B, the injection hole 14 is such that an entrance center 14a of the injection hole 14 is disposed offset so that the swirl center 17a, which forms a central position of the swirl chamber 17, and an exit center 14b of the injection hole 14 coincide. In the drawing (in a plane perpendicular to the axial direction) , fuel is introduced from the branched channel 18 in an introduction direction 18a into the swirl

chamber 17, swirls around inside the swirl chamber 17, and is injected in a fuel injection direction 21a contrary to an offset direction (a direction from the swirl center 17a toward the entrance center 14a of the injection hole 14) 14c. In the example of Figs. 5A and 5B, the introduction direction 18a of the branched channel 18 is perpendicular to the offset direction 14c and the fuel injection direction 21a.
Also, the swirl chamber 17 is of a cylindrical form, and in this case, a center of the cylinder is defined as the center (the swirl center 17a) of the swirl chamber 17.
[0016]
A method of reducing atomized fuel droplet size utilizing a swirl flow is such that a swirl flow is generated with the center of the swirl chamber 17 as an origin. When a swirl flow is generated, a cavity portion in which no fuel exists occurs in the axial direction in a central position in the swirl chamber 17. A fuel cavity portion also occurs in the same direction in an interior of the injection hole 14, swirling fuel on which a liquid film is formed exists in a periphery of the cavity portion in the injection hole 14, and atomized fuel injected from the exit portion of the injection hole 14 is in a state wherein droplet size is reduced.
However, when the exit center 14b of the injection hole 14 does not coincide with the swirl center 17a and deviates, a thickness of the liquid film is uneven in a circumferential

direction of the injection hole 14, which is an impediment to fuel atomization.
[0017]
At this point, a fuel injection valve of a structure such that an entrance center 140a of an injection hole 140 is not offset, that is, a structure such that the swirl center 17a and the entrance center 140a of the injection hole 140 are caused to coincide, will be described as a comparative example with respect to the fuel injection valve 1 of the invention.
Fig. 12A is a main portion plan view of a fuel injection valve shown as a comparative example, and shows as an example a case in which the entrance center 140a of the injection hole 140, which is inclined with respect to the axis, coincides with the swirl center 17a of the swirl chamber 17, and Fig. 12B shows a D-D sectional view of Fig. 12A.
As shown in Figs. 12A and 12B, the entrance center 140a of the injection hole 140 and the swirl center coincide, but the injection hole 140 gradually becomes further distanced from the swirl center 17a in an axial direction of the inclined injection hole 140 toward an exit portion, because of which a thickness of a liquid fuel film formed on an inner periphery of the injection hole 140 in the exit portion of the injection hole 140 is uneven.
[0018]
As opposed to this, in the fuel injection valve 1

according to the present application, as shown in Fig. 6A by a fuel flow 20 centered on the injection hole 14 in the region Al of Fig. 4, the entrance center 14a of the injection hole 14 is offset with respect to the swirl center 17a of the swirl chamber 17, in a plane vertical to the axis, in a direction opposite to the direction of inclination from the entrance portion of the injection hole 14 toward the exit portion, and the exit center 14b of the injection hole 14 is provided in proximity to the swirl center 17a of the swirl chamber 17 . As shown in Fig. 6B, even though the entrance center 14a of the injection hole 14 is offset, fuel 19 introduced into the swirl chamber 17 swirls around a periphery of a cavity portion occurring in the swirl center 17a of the swirl chamber 17, and the fuel 19, which has a swirling force, forms a liquid fuel film 19a during a procedure of circling around an inner wall of the injection hole 14. The liquid fuel film 19a flows down the inside of the injection hole 14, and reaches a state of being formed thinly to a uniform thickness along an inner periphery of the exit portion of the injection hole 14. By the entrance center 14a of the injection hole 14 being offset, the exit center 14b of the injection hole 14 can be moved in a direction such that the exit center 14b coincides with a cavity portion occurring in the swirl center 17a. Therefore, the cavity portion does not cause the inner wall in a vicinity of the exit portion of the injection hole 14 to be exposed,

because of which there is no occurrence of a detachment of the liquid fuel film 19a from the inner wall in a vicinity of the exit portion of the injection hole 14, and fuel atomization characteristics after injection are good.
It goes without saying that equalization of the liquid film thickness in the exit portion reaches an optimal state by the exit center 14b of the injection hole 14 being caused to coincide with the swirl center 17a of the swirl chamber 17.
[0019]
Herein, an offset amount of the entrance portion of the injection hole 14 is desirably set so as to satisfy a
relationship of "injection hole offset amount < radius of injection hole 14 (a cross-section of the injection hole 14 is circular) , in order that the swirl center 17a of the swirl chamber 17 is included within a range of the entrance portion of the injection hole 14 . When the injection hole offset amount is set to a size that exceeds the heretofore described injection hole offset amount, a detached portion in which no liquid film is formed may occur in the entrance portion of the injection hole 14, and the uniformity of liquid film thickness in the exit portion of the injection hole 14 may be lost.
[0020]
Furthermore, although an example wherein the swirl chamber 17 is a cavity of a cylindrical form has been shown, this form is not limiting. The central position in the swirl

chamber 17 of a form other than a cylindrical form is the central position of the swirl (the swirl center 17a) when a swirl flow occurs. When the swirl chamber 17 is of a logarithmic spiral form, a position of an origin of a logarithmic spiral curve is defined as the center of the swirl chamber 17. Also, in a case of a swirl chamber form configured of curved lines having a multiple of curvatures, a center of a curved line having the smallest curvature is defined as the center of the swirl chamber 17.
[0021]
This kind of fuel injection valve 1 according to the first embodiment is of a structure such that the entrance center 14a of the injection hole 14 is offset from the swirl center 17a, taking the inclination of the injection hole 14 into consideration, because of which the thickness of fuel formed into a liquid film swirling in the exit portion of the injection hole 14 can be equalized, and atomization of injected fuel can be promoted. Further, as it is sufficient that the bottom faces of the swirl chamber 17 and the branched channel 18 are formed in a plane vertical to the central axial line of the fuel injection valve 1, that is, by hollowing out an upper face of the injection hole plate 13 to a constant depth, no complex process is needed, because of which productivity improves.
[0022]
In Figs. 5A, 5B and Figs. 6A, 6B, the swirl chamber

formation portion of the region Al of Fig. 4 is shown as an example, the flow of fuel in the branched channel 18 and the flow of injected fuel intersect at right angles in a plane (for example, the plane of the drawing) perpendicular to the axis, and a swirl of fuel in the swirl chamber 17 is less than one rotation.
However, as shown in an enlarged plan view of the region A2 of Fig. 4 in Fig. 7, the flow of fuel and the flow of injected fuel in the swirl chamber formation portion of the region A2 are parallel, and a swirl of fuel in the swirl chamber 17 is in a state of practically making one rotation. Therefore, the configuration is such that a stronger swirling force is imparted to the fuel in the region A2 than to the fuel in the region Al. That is, owing to the strength of the fuel swirling force generated in the swirl chamber 17, an injection force of fuel injected from the injection holes 14 positioned in the region A2 and the region A4 is stronger than an injection force of fuel injected from the injection holes 14 positioned in the region Al and the region A3.
In the region Al and the region A4, or the region A2 and the region A3, in which fuel is injected in the same direction, a difference in a fuel spray division position occurs owing to a difference in strength imparted to the fuel swirling force, an advantage is obtained in that interference between sprayed droplets is less likely to occur, and a reduction in fuel

droplet size in a collective spray is further promoted.
[0023] Second Embodiment
Next, the fuel injection valve 1 in a second embodiment of the invention will be described, using Fig. 8.
An example wherein the injection hole 14 extending linearly is formed to have the same aperture dimension in the inclined channel direction is shown in the first embodiment. However, when the injection hole 14 is caused to incline with respect to the bottom face of the swirl chamber 17, a portion wherein an angle formed by the bottom face of the swirl chamber 17 and an inner peripheral face of the injection hole 14 is an acute angle occurs. There is concern that in the portion in which the angle formed is an acute angle, the inner wall of the injection hole 14 will not be covered by the liquid fuel film 19a, a detached portion of fuel flow will occur, formation of the liquid fuel film 19a along the inner peripheral face of the injection hole 14 will be in an insufficient state, and fuel atomization characteristics after injection will worsen.
[0024]
Fig. 8 is a main portion sectional view showing the fuel injection valve 1 according to the second embodiment of the invention, and is an enlarged sectional view of one injection hole 14 . As shown in Fig. 8, the aperture dimension is adjusted in the entrance portion of the injection hole 14, a wider

aperture dimension is employed in a joint portion of the bottom face of the swirl chamber 17 and the injection hole 14, and the entrance portion of the injection hole 14 is of a curved form. That is, the diameter of the entrance portion of the injection hole 14 is widened, and R is designed without an angle portion including a portion in which the bottom face of the swirl chamber 17 and the inner peripheral face of the injection hole 14 form an acute angle or a portion in which the angle is obtuse, thereby obtaining an entrance portion of a smooth curved form. Because of this, a fuel inflow state in the entrance portion of the injection hole 14 is improved, detachment of the liquid fuel film 19a can be restricted, and fuel atomization can be carried out better.
[0025] Third Embodiment
Next, the fuel injection valve 1 in a third embodiment of the invention will be described, using Fig. 9 to Fig. 11.
An example wherein the planar form of the branched channel 18 provided in the injection hole plate 13 is a cross form is shown in the first embodiment. However, the branched channel 18 can also be formed into a form other than a cross form.
Fig. 9 is a plan view showing the branched channel 18 of the injection hole plate 13, and shows a state wherein the branched channel 18 is provided in an H-form. When the branched

channel 18 is of an H-form, four swirl chambers 17 separated by equal distances from the axis are provided so that the central position of the entrance portion of the injection hole 14 is offset farther to the upstream side of the branched channel 18 than the central position of the swirl chamber 17, and a direction of the offset is parallel to the fuel introduction direction in the branched channel 18 . Therefore, as a greater portion of fuel flowing into the swirl chamber
17 flows into the injection hole 14 after flowing once around
the swirl chamber 17, a configuration is such that the fuel
can obtain a sufficient swirling force in the swirl chamber
17. Because of this, the fuel atomization state after
injection is good.
[0026] Fig. 10 is a plan view showing an I-form branched channel
18 of the injection hole plate 13, and shows as an example a
state wherein two swirl chambers 17 contrary to the swirl
direction are disposed adjacent in each end portion of the
branched channel 18. When the I-form branched channel 18 is
employed too, the branched channel 18 is provided so that the
direction in which fuel is introduced from the branched channel
18 into the swirl chamber 17 and the direction in which the
injection hole 14 is inclined practically coincide in a plane
vertical to the axis, and the offset direction of the entrance
portion of the injection hole 14 is parallel to the fuel

introduction direction in the branched channel 18 as far as the swirl chamber 17. Therefore, the central position of the entrance portion of the injection hole 14 is offset to the upstream side of a fuel passage of the branched channel 18. In this case too, the fuel can obtain a sufficient swirling force in the swirl chamber 17, and promotion of injected fuel atomization can be achieved. In this way, one integrated branched channel 18 may be provided with respect to two swirl chambers 17.
[0027]
Fig. 11 is a plan view showing an X-form branched channel 18 of the injection hole plate 13, wherein four swirl chambers 17 separated by equal distances from the axis are provided in end portions of the X-form branched channel 18, with the central position of the entrance portion of the injection hole 14 offset from the central position of the swirl chamber 17 at an angle to the channel of the branched channel 18. In this way, the branched channel 18 is configured so as to pass through the center of the valve seat aperture portion 12b of the fuel supply unit la. In this case too, the central position of the entrance portion of the injection hole 14 is offset in a direction opposite to the direction in which fuel is injected in a plane perpendicular to the axis in each swirl chamber 17, because of which the liquid film can be equalized in the exit portion of the injection hole 14, and the fuel atomization state after

injection is good.
As shown in Fig. 11, an angle of intersection of two branched channels 18 leading to two injection holes 14 that inject fuel in the same direction is an acute angle . Therefore, it can be said that the direction in which fuel flows into the swirl chamber 17 from the branched channel 18 and the direction in which the injection hole 14 inclines approximately coincide in a plane perpendicular to the axis.
[0028]
The embodiments can be freely combined, and each embodiment can be modified or abbreviated as appropriate, without departing from the scope of the invention. Reference Signs List
[0029] 1 fuel injection valve, la fuel supply unit, 4 solenoid device, 5 housing, 6 core, 7 coil, 8 armature, 8a armature outer face portion, 8b armature upper face portion, 9 valve device, 10 valve body, 11 valve main body, 12 valve seat, 12b valve seat aperture portion, 13 injection hole plate, 14 injection hole, 14a entrance center, 14b exit center, 14c offset direction, 15 ball, 15a chamfered portion, 16 compression spring, 17 swirl chamber, 17a swirl center, 18 branched channel, 18a introduction direction, 19 fuel, 19a liquid fuel film, 20 fuel flow, 21 atomized fuel, 21a fuel injection direction, 22 intake port, 23 intake valve

WE CLAIM:
[Claim 1]
A fuel injection valve, comprising:
a fuel supply unit that supplies fuel in a channel axis direction; and
an injection hole plate that is provided on a downstream side of the fuel supply unit, causes fuel supplied from the fuel supply unit to divide into multiple directions in a plane perpendicular to the axis, thereby guiding the fuel into a swirl chamber that imparts a swirling force to the fuel, and injects the fuel from an injection hole bored in a bottom face of the swirl chamber, which is perpendicular to the axis, and inclined with respect to the axis, wherein
the injection hole is such that a center of an entrance portion into which fuel is caused to flow is offset from a fuel swirl center of the swirl chamber, and a center of an exit portion through which fuel is ejected is provided in proximity to the swirl center. [Claim 2]
The fuel injection valve according to claim 1, wherein the injection hole is provided so that the center of the exit portion is positioned directly below the swirl center. [Claim 3]
The fuel injection valve according to claim 1 or claim 2, wherein the center of the entrance portion of the injection

hole is offset in a direction opposite to a direction of inclination of the injection hole in a plane perpendicular to the axis. [Claim 4]
The fuel injection valve according to any one of claims 1 to 3, wherein fuel supplied to the injection hole plate is led to the swirl chamber via a branched channel formed of a recessed portion provided in an upper face of the injection hole plate, and
bottom faces of the branched channel and the swirl chamber are configured of a continuous flat face. [Claim 5]
The fuel injection valve according to any one of claims 1 to 4, wherein the swirl chamber is provided in four differing positions separated by equal distances from the axis, and
fuel is injected in the same direction from two neighboring swirl chambers so as to be divided into a fork from the injection hole plate. [Claim 6]
The fuel injection valve according to any one of claims 1 to 5, wherein the entrance portion of the injection hole is of a curved form. [Claim 7]
The fuel injection valve according to claim 4, wherein a planar form of the branched channel of the swirl chamber is

one of a cross form, an I-form, an H-form, or an X-form.