WO2023209976A1

WO2023209976A1 - Fuel injection valve

Info

Publication number: WO2023209976A1
Application number: PCT/JP2022/019366
Authority: WO
Inventors: 康寛小松; 豊井澤; 雄大三浦; 裕士八島; 勇輝堀
Original assignee: 日立Astemo株式会社
Priority date: 2022-04-28
Filing date: 2022-04-28
Publication date: 2023-11-02

Abstract

In this fuel injection valve, a taper angle (θ) at which each outlet diameter (D) is made larger than each inlet diameter (d) is given to respective constituting fuel injection holes (51, 52, 53) of first and second fuel injection hole groups (50A, 50B) disposed on a single imaginary circle (C) set in an inner surface of a nozzle plate 10, and different swing angles (α, β, γ) are given between hole axis lines (51a, 52a, 53a) of the fuel injection holes (51, 52, 53) and a boundary surface (B) between the first and second fuel injection hole groups (50A, 50B) in a plan view of the nozzle plate (10), thereby forming recessed grooves (57a, 57b) opening toward the boundary surface (B) in first and second fuel spray forms (Fa, Fb) emitted from the first and second fuel injection hole groups (50A, 50B). Thus, when injection of fuel is targeted at valve parts of a pair of suction valves, the first and second fuel spray forms emitted from the first and second fuel injection hole groups can avoid contacting valve stems of both suction valves as much as possible.

Description

fuel injection valve

The present invention relates primarily to fuel injection valves used in engine fuel supply systems, and particularly to improvements in port injection type fuel injection valves, that is, fuel injection valves of the type that inject fuel into an intake port.

Conventionally, such fuel injection valves include a valve seat member having a conical valve seat and a valve hole passing through the center of the valve seat, a valve body that opens and closes the valve hole in cooperation with the valve seat, and a valve body that opens and closes the valve hole in cooperation with the valve seat. and a nozzle plate joined to the outer end surface of the valve seat member where the valve hole opens, and on the inner surface of the nozzle plate, double large and small virtual concentric circles are set with the axis of the valve hole as the center, A boundary surface is set that includes the axis of the valve hole and bisects the double virtual concentric circle into one virtual double semicircle and the other virtual double semicircle, and is placed on one virtual double semicircle. A first fuel nozzle group consisting of a plurality of fuel nozzle holes disposed on the other virtual double imaginary semicircle, and a second fuel nozzle group consisting of a plurality of fuel nozzle holes arranged on the other virtual double virtual semicircle. Patent Document 1 below discloses a nozzle plate in which first and second fuel spray forms are emitted from first and second fuel nozzle groups in diagonally opposite directions across the boundary surface. Known as disclosed.

Japanese Patent Publication No. 2008-169766

In the fuel injection valve disclosed in Patent Document 1, the first and second fuel spray forms emitted from the first and second fuel injection hole groups each have a circular cross-sectional shape, and the fuel particles are entirely It is distributed in

By the way, in a fuel injection valve that injects fuel toward the downstream side of the engine's intake port, when the fuel injection target point is set to the valve part of a pair of intake valves due to the downsizing of the engine, the conventional fuel injection valve described above is used. When an injection valve is employed to direct the first and second fuel foams emitted from the first and second fuel nozzle groups toward the valve portions of the pair of intake valves, the first and second fuel spray foams are It comes into contact with the valve rod of the intake valve and causes a lot of fuel particles to adhere to it. Furthermore, in order to avoid this, if the opening angle between the first and second fuel spray forms is widened, the first and second fuel spray forms will come into greater contact with the port wall surface. Such a phenomenon not only hinders the improvement of the fuel efficiency of the engine, but also causes an increase in PN (number of emitted particulate matter).

The present invention has been made in view of the above circumstances, and when the fuel injection target point is the valve part of a pair of intake valves, the first and second fuel injection hole groups are configured to form the first and second fuel spray forms. It is an object of the present invention to provide a fuel injection valve that can efficiently inject fuel toward both intake valves while avoiding contact with the valve rods of both intake valves as much as possible.

To achieve the above object, the present invention provides a valve seat member having a conical valve seat and a valve hole passing through the center of the valve seat, and a valve that cooperates with the valve seat to open and close the valve hole. a nozzle plate joined to an outer end surface of the valve seat member where the valve hole opens, and a nozzle plate having a nozzle plate connected to the inner surface of the nozzle plate on the valve seat member side, centered on the axis of the valve hole. At the same time, a boundary surface is set that includes the axis of the valve hole and bisects the single virtual circle into one virtual semicircle and the other virtual semicircle, and a first fuel nozzle hole group consisting of a plurality of fuel nozzle holes that open their inlets on a virtual semicircle; and a second fuel nozzle group consisting of a plurality of fuel nozzle holes that open their inlets on the other virtual semicircle. a fuel nozzle hole group is provided in the nozzle plate, the hole axis of the fuel nozzle hole is inclined in a direction away from the axis of the valve hole as it goes from the inlet side to the outlet side, and the first and second fuel injection holes The fuel injection valve is configured to emit first and second fuel spray forms from a group of holes in diagonally opposite directions across the boundary surface, the fuel injection valve having a plurality of fuel injection holes emitted from respective inlet diameters. A taper angle is provided to increase the diameter of the aperture, and different deflection angles are provided between the hole axes of the plurality of fuel injection holes and the boundary surface when the nozzle plate is viewed from above, so that the first and the first and second The first feature is that a concave groove opening toward the boundary surface is formed in the two-fuel spray foam.

In addition to the first feature, the present invention also provides that each fuel nozzle hole group includes a central fuel nozzle hole located at the center of the group, and a pair of first outer fuel nozzle holes located on both sides of the central fuel nozzle hole. and a pair of second outer fuel nozzle holes located on both sides of the first outer fuel nozzle holes, the center hole axis being the hole axis of the central fuel nozzle hole in a plan view of the nozzle plate. intersects the axis of the valve hole, while the first outer hole axis, which is the hole axis of the first outer fuel injection hole, and the second outer hole axis, which is the hole axis of the second outer fuel injection hole, intersect with the axis of the valve hole. When the central hole axis, the first outer hole axis, and the second outer hole axis intersect the boundary surface at successive distances from the axis of the hole, and the deflection angles that the central hole axis, the first outer hole axis, and the second outer hole axis make with the boundary surface are α, β, and γ. , α>β>γ.

Furthermore, in addition to the first and second features, the present invention provides a configuration in which each fuel nozzle hole of the first and second fuel nozzle hole groups is arranged such that the generatrix extension line of the conical surface forming the valve seat is The third feature is that the hole is formed so as to cross the inner circumferential surface of the hole through the entrance thereof.

According to the first feature of the present invention, the first and second fuel spray forms emitted from the first and second fuel injection hole groups in diagonally opposite directions across the boundary surface are provided with openings toward the boundary surface. It is possible to create a concave groove. Therefore, when such first and second fuel spray forms are directed toward the valve portions of a pair of intake valves, the grooves of the first and second fuel spray forms come to receive the valve rods of both intake valves. , contact of the first and second fuel spray foams with both valve rods can be avoided as much as possible, which can contribute to improving the fuel efficiency of the engine and reducing PN.

According to the second feature of the present invention, in each fuel injection hole group, the central hole axis intersects the valve hole axis in plan view of the nozzle plate, while the first outer hole axis and the second outer hole axis intersect with the valve hole axis. They are spaced sequentially from the axis of the valve hole and intersect with the boundary surface, and the deflection angles that these central hole axis, first outer hole axis, and second outer hole axis make with respect to the boundary surface are α, β, and γ. By setting α>β>γ, grooves opening toward the boundary surface can be accurately formed in the first and second fuel spray forms. Therefore, when the first and second fuel spray forms are directed toward the valve portions of the pair of intake valves, the grooves of the first and second fuel spray forms will accurately receive the valve rods of both intake valves. , it is possible to effectively prevent the first and second fuel spray forms from coming into contact with the pair of valve rods, which can further contribute to improving the fuel efficiency of the engine and reducing PN. In addition, it not only prevents interference between fuel injected from adjacent fuel nozzles in each fuel nozzle group, but also ensures a sufficient opening angle between the hole axes of the second outer fuel nozzles in both fuel nozzle groups. Therefore, it is possible to prevent interference between the fuel injected from both second outer fuel injection holes, suppress the occurrence of fuel wetting on the outer surface of the nozzle plate, and contribute to prevention of deposit accumulation.

According to the third feature of the present invention, each of the fuel nozzle holes of the first and second fuel nozzle holes is connected so that the generatrix extension line of the conical surface forming the valve seat passes through the inlet of the fuel nozzle hole and the inner periphery of the fuel nozzle hole. Since the fuel is formed so as to intersect with the plane, when the fuel that passes through the valve hole flows into the inlet of each fuel nozzle hole, it collides with the inner circumferential surface of the nozzle hole with force, promoting atomization and flowing into the outlet. is sprayed from. As a result, a fuel spray foam with good fuel atomization can be emitted from each fuel nozzle hole, which can further contribute to improving the fuel efficiency of the engine and reducing PN.

FIG. 1 is a sectional view of a main part of an engine equipped with a fuel injection valve according to the present invention, showing a state in which the fuel injection valve emits fuel spray foam. FIG. 2 is a longitudinal section taken along line 2-2 in FIG. FIG. 3 is an enlarged longitudinal sectional view of the fuel injection valve in FIG. 1. FIG. 4 is an enlarged view of the fourth part in FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. FIG. 6 is an enlarged plan view of the nozzle plate viewed from the inner surface side.

I...Fuel injection valve B...Boundary surface C...Virtual circle Ca...One virtual semicircle Cb...The other virtual semicircle d...・Entrance diameter D of the fuel nozzle hole...Exit diameter Fa of the fuel nozzle hole...First fuel spray form Fb...Second fuel spray form θ...Taper of the fuel nozzle hole Angle Y... Axis α of the valve hole 7... Deflection angle β of the center hole axis... Deflection angle γ of the first outer hole axis...... Deflection angle γ of the second outer hole axis Deflection angle 2... Valve housing 3... Valve seat member 7... Valve hole 8... Valve seat 10... Nozzle plate 13... Valve body 14 ... Spherical valve portion 50A... First fuel nozzle hole group 50B... Second fuel nozzle hole group 51... Fuel nozzle hole (center fuel nozzle hole)
52...Fuel injection hole (first outer fuel injection hole)
53...Fuel passage (second outer fuel injection hole)
51a... Central hole axis 52a... First outer hole axis 53a... Second outer hole axis 57a... Concave groove 57b of first fuel spray form... Concave groove of second fuel spray form

Embodiments of the present invention will be described below based on the accompanying drawings. In the electromagnetic fuel injection valve I according to the present invention, the fuel injection side is the front side, and the fuel inlet side is the rear side.

First, in FIG. 1, a cylinder head 40 of an engine E is formed with an intake port 42 and a pair of

intake valve holes

54a and 54b that are formed at the downstream end of the intake port 42 and open into the combustion chamber. , a pair of

intake valves

55 and 56 that open and close these

intake valve holes

54a and 54b are slidably supported by the cylinder head 40. These

intake valves

55, 56 are respectively comprised of umbrella-shaped

valve portions

55a, 56a and rod-shaped

valve rods

55b, 56b. The electromagnetic fuel injection valve I is mounted in the mounting hole 41 of the cylinder head 40 via a seal/cushion ring 43. At this time, this fuel injection valve I is arranged so that a boundary surface B, which will be described later, including its axis Y passes through the midpoint between the pair of

intake valves

55 and 56. The fuel injection valve I emits first and second fuel spray forms Fa and Fb toward the pair of

valve portions

55a and 56a with the boundary surface B in between.

As shown in FIGS. 3 and 4, the valve housing 2 of the fuel injection valve I is fitted with a cylindrical valve seat member 3 and the outer peripheral surface of the rear end of the valve seat member 3 and welded in a liquid-tight manner. a magnetic cylindrical body 4, a non-magnetic cylindrical body 6 that is liquid-tightly welded against the rear end of the magnetic cylindrical body 4, and a small-diameter front end portion 5a on the inner peripheral surface of the non-magnetic cylindrical body 6. It is composed of a hollow cylindrical fixed core 5 that is fitted and welded in a liquid-tight manner, and a fuel inlet cylinder 26 that is fitted to the outer periphery of the rear end of the fixed core 5 and welded in a liquid-tight manner.

The valve seat member 3 includes a valve seat 8 formed with a conical surface with a center angle φ, a valve hole 7 passing through the center of the valve seat 8, and a valve guide hole 9 connected to a large diameter portion of the valve seat 8. , and a tapered hole 16 continuous to the rear end of the valve guide hole 9.

At the front end of the non-magnetic cylindrical body 6, a portion that does not fit with the fixed core 5 is left, and a hollow cylindrical movable core 12 facing the front end surface of the fixed core 5 is fitted from that portion to the magnetic cylindrical body 4. A valve body 13 is connected to this movable core 12.

The valve body 13 includes a spherical valve portion 14 that can slide in the valve guide hole 9 to open and close the valve hole 7 in cooperation with the valve seat 8, and a front end portion welded to the spherical valve portion 14. The rear end of the valve rod 15 is press-fitted into the inner circumferential surface of the movable core 12 and welded to the movable core 12. Therefore, the valve body 13 can move up and down within the valve housing integrally with the movable core 12.

The valve rod 15 is made of a pipe material with a slot 15a, and the inside thereof communicates with the hollow part of the movable core 12, and the inside and outside of the valve rod 15 communicate with each other via the slot 15a.

A retainer 20 made of a slotted pipe material is press-fitted and fixed in the hollow part of the fixed core 5 at its intermediate part, and its front end becomes the first spring seat 21. On the other hand, the rear end of the valve rod 15 ends in the middle of the hollow part of the movable core 12, and the rear end becomes the second spring seat 22, and the valve is disposed between the first and second spring seats 21 and 22. A spring 23 is compressed, and the set load of the valve spring 23 urges the movable core 12 in a direction away from the fixed core 5, that is, in a direction in which the valve body 13 closes. The set load of the valve spring 23 is adjusted by the press-fitting depth of the retainer 23 into the fixed core 5.

A ring-shaped stopper member 35 made of a non-magnetic material is embedded in the inner peripheral surface of the movable core 12 and slightly protrudes from the rear end surface. This stopper member 35 comes into contact with the fixed core 5 and maintains a constant gap between the two

cores

5 and 12 when the fixed core 5 is attracted to the movable core 12.

A coil assembly 28 is fitted on the outer periphery of the valve housing 2 in correspondence with both

cores

5 and 12. This coil assembly 28 extends from the rear end of the magnetic cylindrical body 4 to the fixed core 5, and consists of a synthetic resin bobbin 29 that is fitted onto the outer peripheral surface of the bobbin 29, and a coil 30 that is wound around the bobbin 29. A terminal support arm 29a is integrally formed at the rear end of the bobbin 29 to support the base end of a power supply terminal 33 that protrudes to one side, and the end of the coil 30 is connected to the power supply terminal 33. be done. A yoke 31 is disposed around the outer periphery of the coil assembly 28. In the above description, the fixed core 5, the movable core 12, the valve spring 23, and the coil assembly 28 constitute the electromagnetic actuation device 11 that opens the valve body 13 when the coil 30 of the coil assembly 28 is energized.

A synthetic resin coating layer 27 is injection molded from the magnetic cylindrical body 4 to the fuel inlet tube 26, covering their outer peripheral surfaces and embedding the coil assembly 28. At this time, a coupler 34 that accommodates and holds the power supply terminal 33 and projects to one side of the coil assembly 28 is integrally molded with the coating layer 27.

A fuel filter 36 is attached to the inlet of the fuel inlet pipe 26. Further, a fuel supply cap 46 is fitted onto the outer periphery of the upper end of the fuel inlet pipe 26 via a seal member 47 . This fuel supply cap 46 is one of a plurality of fuel supply caps branched from a fuel rail 45 connected to a discharge port of a fuel pump (not shown).

As shown in FIGS. 4 and 5, the valve guide hole 9 provided in the valve seat member 3 has a regular polygonal cross section (regular hexagonal shape in the illustrated example), and the large diameter of the conical valve seat 8. It is formed so as to extend rearward along the axis Y of the valve hole 7 (which is also the axis of the fuel injection valve I). That is, the valve guide hole 9 in this illustrated example has six plane parts 9a of the same width and six inner corner parts 9b arranged alternately so as to surround the axis Y of the valve hole 7 (that is, the axis of the valve hole 7). The six plane parts 9a serve as guide parts for guiding the lifting and lowering of the spherical valve part 14, that is, the opening and closing operations. Furthermore, a plurality of fuel passages 37 are defined between the six inner corner portions 9b and the spherical valve portion 14, which are connected to the valve seat 8.

In the above, each hollow part of the fuel inlet cylinder 26, fixed core 5, valve rod 15, and valve housing 2, the slot 15a of the valve rod 15, and the plurality of fuel passages 37 around the spherical valve part 14 are connected to the fuel inlet cylinder. A series of fuel passages 39 are formed from the inlet of valve 26 to valve seat 8.

A nozzle plate 10 made of a steel plate is liquid-tightly welded to the front end surface of the valve seat member 3 where the outlet of the valve hole 7 opens, that is, the outer end surface.

As shown in FIG. 6, the axis Y of the valve hole 7 is defined in a circular area surrounded by the outlet of the valve hole 7 on the inner surface of the nozzle plate 10 facing the outer end surface of the valve seat member 3. A single virtual circle C is set as the center. In addition, a boundary surface B is set that equally divides this single virtual circle C into one virtual semicircle Ca and the other virtual semicircle Cb. A first fuel injection hole group 50A consisting of fuel injection holes 51, 52, and 53, and a second fuel injection hole group consisting of a plurality of fuel injection holes 51, 52, and 53 having inlets opening on the other virtual semicircle Cb. A nozzle hole group 50B is bored in the nozzle plate 10.

The first and second fuel injection hole groups 50A and 50B include a central fuel injection hole 51 located at the center of the group, a pair of first outer fuel injection holes 52 located on both sides of this central fuel injection hole 51, and a pair of first outer fuel injection holes 52 located on both sides of the central fuel injection hole 51. It has at least a pair of second outer fuel injection holes 53 located on both sides of the first outer fuel injection hole 52, respectively.

The partially enlarged view in FIG. 4 shows the central fuel nozzle hole 51 of the first fuel nozzle group 50A, representing all the fuel nozzles of the first and second fuel nozzle groups 50A and 50B. As is clearer, the hole axes 51a, 52a, 53a of all the fuel injection holes 51, 52, 53 are inclined away from the axis Y of the valve hole 7 as they go from the inlet side to the outlet side. All of the fuel injection holes 51, 52, and 53 are given a taper angle θ that makes the outlet diameter D larger than the inlet diameter d.

Referring again to FIG. 6, since the first and second fuel nozzle hole groups 50A and 50B have symmetrical configurations, only the first fuel nozzle hole group 50A will be described, and a description of the second fuel nozzle hole group 50B will be omitted. .

First, in the first fuel injection hole group 50A, the hole axis of the central fuel injection hole 51 is the center hole axis 51a, the hole axis of the first outer fuel injection hole 52 is the first outer hole axis 52a, and the second outer fuel injection hole 53. These hole axes will be referred to as second outer hole axes 53a.

In plan view from the inner surface side of the nozzle plate 10, the central hole axis 51a is orthogonal to the axis Y of the valve hole 7, while the first outer hole axis 52a is spaced apart from the axis Y of the valve hole 7. The second outer hole axis 53a is further spaced apart from the axis Y of the valve hole 7 and intersects with the boundary surface B. When the deflection angles that these central hole axis 51a, first outer hole axis 52a, and second outer hole axis 53a make with respect to the boundary surface B are α, β, and γ, α>β>γ is set. do. All the fuel injection holes 51, 52, 53 are formed in the nozzle plate 10 so as to satisfy these conditions.

Next, the operation of this embodiment will be explained.

When the coil 30 is in the OFF state, the set load of the valve spring 22 pushes the movable core 12 and the valve body 13 forward, seating the spherical valve portion 14 on the valve seat 8. Therefore, the fuel pumped from the fuel pump (not shown) through the fuel line to the fuel inlet cylinder 26 fills the series of fuel passages 39 and waits.

When the coil 30 is energized, the magnetic flux generated by the coil 30 sequentially runs through the fixed core 5, coil housing 31, magnetic cylinder 4, and movable core 12, and the magnetic force causes the movable core 12 to move along with the valve body 13 to the valve spring 22. is attracted to the fixed core 5 against the set load, and the spherical valve portion 14 of the valve body 13 is separated from the valve seat 8 to open the valve hole 7. The fuel flowing down through the plurality of fuel passages 37 passes through the valve seat 8 and the valve hole 7, and then flows from the fuel injection holes 51, 52, 53 of the first and second fuel injection hole groups 50A, 50B of the nozzle plate 10. The air is injected toward the

valve portions

55a and 56a of the pair of

intake valves

55 and 56.

By the way, the first and second fuel injection hole groups 50A and 50B open their inlets on one virtual semicircle Ca and the other virtual semicircle Cb set on the inner surface of the nozzle plate 10, respectively. Consisting of a plurality of fuel nozzle holes 51, 52, 53, and in each fuel nozzle hole group 50A, 50B, all fuel nozzle holes 51, 52, 53 have an outlet diameter D larger than an inlet diameter d. The taper angle θ is given to By tilting, the first fuel nozzle hole group 50A and the second fuel nozzle hole group 50B are separated from each other in diagonally opposite directions across the boundary surface B, as shown in FIG. The fuel can be injected toward the

valve portions

55a, 56a of the

intake valves

55, 56 to form the first and second fuel spray forms Fa, Fb.

At that time, in particular, each

fuel nozzle hole

51, 52, 53 of the first and second fuel nozzle hole groups 50A, 50B has a generatrix extension line 8a of the conical surface forming the valve seat 8. 52 and 53 so that the fuel passes through the inlets of the valve holes 7 and crosses the inner circumferential surfaces thereof. , 52, 53 to promote atomization, and are injected from the outlets of each of 51, 52, 53. As a result, first and second fuel spray forms Fa and Fb with good fuel atomization can be emitted from the first and second fuel injection holes 51, 52, and 53, as shown in FIG. It can contribute to improving the fuel efficiency of the engine and reducing PN.

Moreover, in each of the first and second fuel injection hole groups 50A and 50B, the central hole axis 51a intersects the axis Y of the valve hole 7 in a plan view of the nozzle plate 10, while the first outer hole axis 52a and the second The outer hole axis 53a is successively spaced apart from the axis Y of the valve hole 7 and intersects the boundary surface B. By setting α>β>γ, the first and second fuel spray forms Fa, Fb can be set at the boundary It comes to have a V-shaped or U-shaped cross-sectional shape with

grooves

57a and 57b opening toward surface B. Therefore, the first and second fuel spray forms Fa and Fb directed toward the

valve portions

55a and 56a of the pair of

intake valves

55 and 56 are applied to the valve rods of both

intake valves

55 and 56 in the

grooves

57a and 57b. 55b, 56b, contact of the first and second fuel spray forms Fa, Fb with both the

valve rods

55b, 56b is avoided as much as possible, and fuel adhesion to both the

valve rods

55b, 56b is minimized. However, it can further contribute to improving the fuel efficiency of the engine and reducing PN.

Furthermore, all the fuel nozzle holes 51, 52, 53 of the first and second fuel nozzle hole groups 50A, 50B are arranged on a single virtual circle C set on the inner surface of the nozzle plate 10. Therefore, it is possible to ensure a sufficient distance between the fuel injection holes 51, 52, and 53, and to avoid mutual interference between the injected fuels from the adjacent fuel injection holes 51, 52, and 53. Further, by ensuring a sufficient opening angle δ between the second outer hole axes 53a of both fuel injection hole groups 50A and 50B, interference between the fuel injected from both second outer fuel injection holes 53 can be effectively prevented. I can do it. As described above, it is possible to suppress the occurrence of fuel wetting due to mutual interference between the injected fuels on the outer surface of the nozzle plate 10, and to prevent the accumulation of deposits.

The present invention is not limited to the above embodiments, and various design changes can be made without departing from the gist thereof.

Claims

A valve seat member (3) has a conical valve seat (8) and a valve hole (7) passing through the center of the valve seat (8), and the valve hole (7) cooperates with the valve seat (8). 7) includes a valve body (13) that opens and closes, and a nozzle plate (10) joined to the outer end surface of the valve seat member (3) where the valve hole (7) opens. ), a single imaginary circle (C) centered on the axis (Y) of the valve hole (7) is set on the inner surface of the valve seat member (3) side, and Set a boundary surface (B) that includes the axis (Y) of and bisects the single virtual circle (C) into one virtual semicircle (Ca) and the other virtual semicircle (Cb), and A first fuel injection hole group (50A) consisting of a plurality of fuel injection holes (51, 52, 53) having inlets opening on one virtual semicircle (Ca), and the other virtual semicircle (Cb). A second fuel nozzle group (50B) consisting of a plurality of fuel nozzle holes (51, 52, 53) whose inlets are opened at the top is provided in the nozzle plate (10), , 52, 53) are inclined in a direction away from the axis (Y) of the valve hole (7) as it goes from the inlet side to the outlet side of each. The fuel injection valve is configured to emit first and second fuel spray forms (Fa, Fb) from two fuel injection hole groups (50A, 50B) in diagonally opposite directions with the boundary surface (B) in between. hand,
The plurality of fuel injection holes (51, 52, 53) are given a taper angle (θ) such that the outlet diameter (D) is larger than the respective inlet diameter (d),
In plan view of the nozzle plate (10), there are different deflection angles (α) between the hole axes (51a, 52a, 53a) of the plurality of fuel injection holes (51, 52, 53) and the boundary surface (B). , β, γ),
A fuel injection valve, characterized in that the first and second fuel spray forms (Fa, Fb) are formed with concave grooves (57a, 57b) that open toward the boundary surface (B).
Each fuel nozzle hole group (50A, 50B) includes a central fuel nozzle hole (51) located at the center of the group, and a pair of first outer fuel nozzle holes (52) located on both sides of this central fuel nozzle hole (51). ) and a pair of second outer fuel injection holes (53) located on both sides of these first outer fuel injection holes (52),
In a plan view of the nozzle plate (10), the central hole axis (51a), which is the hole axis of the central fuel injection hole (51), intersects the axis (Y) of the valve hole (7),
The first outer hole axis (52a), which is the hole axis of the first outer fuel injection hole (52), and the second outer hole axis (53a), which is the hole axis of the second outer fuel injection hole (53), are successively spaced apart from the axis (Y) of the valve hole (7) and intersecting the boundary surface (B);
When the deflection angles that these central hole axis (51a), first outer hole axis (52a), and second outer hole axis (53a) make with respect to the boundary surface (B) are α, β, and γ, α> The fuel injection valve according to claim 1, characterized in that β>γ.
Each fuel nozzle hole (51, 52, 53) of the first and second fuel nozzle hole groups (50A, 50B) is connected to the generatrix extension line (8a) of the conical surface forming the valve seat (8). The fuel injection valve according to claim 1 or 2, characterized in that the injection hole (51, 52, 53) is formed so as to cross the inner circumferential surface of the injection hole (51, 52, 53) through its entrance.