JP2003003932A - Fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fuel injection performance, by providing a large diameter space between an injection port and a nozzle plate to generate a fuel flow in a diameter direction and disperse injection patterns. SOLUTION: A valve seat member 7 is disposed on a tip side of a casing 1, and a clearance 20 is formed as a flat space having a diameter larger than that of a central opening 7D1 of the valve seat member 7, is disposed between the central opening 7D1 and the nozzle plate 17. When a valve element 8 is opened, a cross flow A of fuel, which flows in a diametrically outer direction in the clearance 20 from the side of the central opening 7D1, is generated to inject the fuel from right and left nozzle holes 18, 19 to the outside. Therefore, since a flow rate in the diametrically outer direction is given to the injected fuel, the injection patterns of the fuel are largely dispersed and atomization of the injected fuel is promoted, even if a shape of the nozzle plate is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection valve suitable for use as, for example, a fuel injection valve of an automobile engine.

[0002]

2. Description of the Related Art Generally, in a fuel injection valve used in, for example, an automobile engine, a valve body is inserted in a valve casing so as to be displaceable. When the injection valve is actuated and the valve body is opened by the actuation of an actuator such as an electromagnetic coil, the fuel supplied to the fuel passage in the valve casing is injected toward the intake pipe of the engine. (For example, Japanese Patent Laid-Open No. 11-70347).

In this type of conventional fuel injection valve, the valve casing is formed as a tubular body extending in the axial direction, and a tubular valve seat member is provided on the tip end side thereof. And, on the inner peripheral side of the valve seat member, a substantially conical valve seat on which an injection port opened on the tip end face and a valve body which is formed so as to surround the injection port and which is inserted into the valve casing is seated on and off. And are provided. A nozzle plate that covers the injection port from the outside is provided on the tip surface of the valve seat member, and the nozzle plate has a plurality of nozzles that inject fuel in the valve casing to the outside when the valve body opens. Holes are drilled.

Here, the nozzle holes are arranged side by side in a double concentric circle. For example, the left nozzle hole located on the left semicircle side of the nozzle holes is left by a predetermined inclination angle with respect to the axial direction. The right nozzle hole located on the right semicircle side is formed so as to be inclined in the right direction. As a result, the injection valve injects fuel in two directions from the left and right nozzle holes corresponding to the arrangement of the intake valve of the engine, for example.

Further, in the left nozzle hole, the nozzle holes located on the inner peripheral side and the nozzle holes located on the outer peripheral side of the double concentric circle are formed at different inclination angles, and the right nozzle hole is also formed in the same manner. The peripheral and outer peripheral nozzle holes are formed with different inclination angles. As a result, at the time of fuel injection, the fuel injected in the left direction and the fuel injected in the right direction spread in a fixed injection pattern.

[0006]

By the way, in the above-mentioned prior art, the nozzle holes of the nozzle plate are arranged in a double concentric pattern, and the nozzle holes on the inner peripheral side and the nozzle holes on the outer peripheral side are inclined differently from each other. The corners are formed to give a fixed injection pattern to the injected fuel.

However, when the nozzle plate is formed, not only the left nozzle hole and the right nozzle hole are formed in different inclination directions, but also the inner peripheral side and outer peripheral side nozzle holes of the left and right nozzle holes are formed. A large number of nozzle holes must be accurately formed so that they have different inclination angles,
There is a problem that it takes time to process and mold the nozzle plate.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to make it possible to appropriately set a fuel injection pattern without complicating the shape and arrangement of nozzle holes. The plate can be easily formed,
It is to provide a fuel injection valve capable of improving fuel injection performance.

[0009]

In order to solve the above-mentioned problems, the present invention provides a valve casing having a fuel passage, and a valve seat having a valve seat formed in the valve casing and surrounding an injection port. The present invention is applied to a fuel injection valve including a member and a valve body that is displaceably provided in the valve casing and that is seated on and off the valve seat of the valve seat member by operating an actuator.

The feature of the structure adopted by the invention of claim 1 is that the valve seat member has an annular wall portion located downstream of the injection port and having a central opening, and the annular wall portion of the annular wall portion. An opening groove is formed on the back side which is formed as a groove having a diameter larger than that of the central opening and is opened on the front end surface of the valve seat member, and the opening recess groove is formed on the front end surface side of the valve seat member. A nozzle plate having a plurality of nozzle holes is formed while defining a clearance space that closes the groove and creates a lateral flow of fuel between the groove and the opening concave groove.

With this configuration, when the valve body is opened, the fuel in the valve casing flows into the central opening from the injection port of the valve seat member, and this fuel is supplied to the annular wall portion of the valve seat member. It flows into a clearance space defined between the nozzle plate and the front surface side. Then, the fuel in the clearance space is injected outward from each nozzle hole while forming a lateral flow that flows radially outward along the nozzle plate. As a result, the clearance space can give a flow velocity in the radial direction to the fuel injected from the nozzle holes, and can diffuse the injection pattern in the radial direction to promote atomization of the fuel.

According to the second aspect of the present invention, each nozzle hole is formed so as to face the clearance space radially outside of the central opening of the valve seat member.

As a result, the fuel flowing into the clearance space from the central opening of the valve seat member flows radially outward in the clearance space, reaches the position of each nozzle hole, and is injected outside. become. Therefore, a sufficient lateral flow can be formed in the fuel injected from the nozzle hole, and the flow velocity in the radial direction can be increased.

According to the third aspect of the invention, the nozzle holes are arranged on both the left and right sides of the central position of the nozzle plate, and the left nozzle holes on the left side of the nozzle holes are parallel to each other. The right nozzle hole located on the right side of each of the nozzle holes is tilted rightward in a state of being parallel to each other.

This makes it possible to form an injection pattern to the left and an injection pattern to the right, corresponding to the arrangement of the intake valves of the engine, for example. At this time, the fuel injected from each nozzle hole is injected in a direction in which the radial flow velocity given by the clearance space and the inclination direction of the nozzle hole are combined in vector. It is possible to diffuse in a wider range than the range of the ejection pattern corresponding to the inclination angle of the nozzle hole.

Further, according to the invention of claim 4, the nozzle holes are arranged side by side in a circular shape.

Accordingly, when the injection valve is operated, fuel can be injected from the nozzle holes arranged in a circular shape, for example, and the flow velocity in the radial direction can be given to the injected fuel by the clearance space. The fuel injection pattern can be broadened to a conical range.

According to the fifth aspect of the present invention, the valve casing is provided with a core member that faces the valve element with a gap in the axial direction and the actuator is arranged on the outer peripheral side, and the core member is provided on the outer peripheral side of the actuator. Provides a magnetic path forming member that forms a magnetic path between the valve casing and the core member, and the valve casing, the core member and the magnetic path forming member form a casing.

As a result, when the actuator composed of, for example, an electromagnetic coil is operated, a magnetic field can be formed between the core member and the valve body via the valve casing, the magnetic path forming member, etc., and the valve body is opened magnetically. Can be made.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A fuel injection valve according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings, taking a case where the fuel injection valve is applied to an automobile engine as an example.

Reference numeral 1 denotes a substantially cylindrical casing which constitutes the main body of the fuel injection valve, and the casing 1 includes a valve casing 2, a fuel inflow pipe 3 and a magnetic path forming member 5 which will be described later.

Reference numeral 2 denotes a valve casing having a cylindrical step forming a tip portion of the casing 1. The valve casing 2 is made of a magnetic material such as electromagnetic stainless steel, and a resin cover 13 described later is attached to the base end side thereof. The large-diameter tubular portion 2A and the small-diameter tubular portion 2B integrally formed on the tip side of the large-diameter tubular portion 2A.

Reference numeral 3 denotes a fuel inflow pipe as a core member formed in a tubular shape from a magnetic material such as electromagnetic stainless steel, and the fuel inflow pipe 3 is provided with a tubular connecting member 4 made of a nonmagnetic material. It is provided on the base end side of the valve casing 2. Further, the fuel inflow pipe 3 is magnetically connected to the valve casing 2 via a magnetic path forming member 5 formed of a magnetic metal piece or the like arranged on the outer peripheral side of the electromagnetic coil 12 described later.

As a result, when power is supplied to the electromagnetic coil 12, a closed magnetic path can be formed through the valve casing 2, the fuel inflow pipe 3, the magnetic path forming member 5 and the adsorption portion 10 of the valve body 8 described later. Further, in the casing 1, a fuel passage 6 is provided that extends in the axial direction from the base end side of the fuel inflow pipe 3 through the inside of the valve casing 2 to the position of a valve seat member 7 described later.

Reference numeral 7 denotes a valve seat member provided by being fitted into the small-diameter cylindrical portion 2B of the valve casing 2, and the valve seat member 7 is made of, for example, a metal material, a resin material, or the like. It is formed in a tubular shape as shown. Further, on the inner peripheral side of the valve seat member 7, a valve body insertion hole 7A which is bored in the axial direction and opened to the base end side of the valve seat member 7, and a tip side of the valve body insertion hole 7A are formed. A substantially conical valve seat 7B, a circular injection port 7C surrounded by the valve seat 7B, an annular wall portion 7D located downstream of the injection port 7C and having a central opening 7D1, An opening groove portion 7E which is formed on the back surface side of the annular wall portion 7D and is opened at the tip end surface of the valve seat member 7 is provided, and these are arranged substantially coaxially.

Here, as shown in FIGS. 3 and 4, the annular wall portion 7D is formed of, for example, an annular plate or the like which projects radially inward of the peripheral wall of the injection port 7C, and the central portion of the annular wall portion 7D has a central portion. The opening 7D1 is opened as a circular through hole having a predetermined opening diameter d. And the annular wall portion 7D is
The front surface side thereof faces the flat surface portion 11B of the valve portion 11 with a gap dimension a in the axial direction interposed therebetween when the valve body 8 described later is closed, and the back surface side thereof has a gap dimension b in the axial direction with the nozzle plate 17 described later. Face to face.

In this case, when the valve body 8 is closed from the open state, a certain amount of fuel remains between the annular wall portion 7D and the flat surface portion 11B of the valve portion 11 in accordance with the clearance dimension a. Therefore, when the valve body 8 is closed, this fuel may leak out through nozzle holes 18 and 19 described later. For this reason,
The clearance dimension a is formed to be as small as possible within a range in which the valve portion 11 and the annular wall portion 7D do not interfere with each other to prevent fuel leakage.

Further, the annular wall portion 7D and the nozzle plate 17
Also in the clearance space 20 described below, which is defined between
Since an amount of fuel corresponding to the clearance dimension b may remain, this clearance dimension b is determined by the clearance space 2 as described later.
It is formed as small as possible within the range in which the lateral flow A of the fuel is generated in zero.

On the other hand, the opening groove portion 7E is, for example, the valve seat member 7
The center opening 7
It is formed as a circular concave groove having a diameter larger than D1 and its diameter D is formed larger than the opening diameter d of the central opening 7D1 (D> d). The opening groove portion 7E is closed by the nozzle plate 17 to define the clearance space 20.

Reference numeral 8 denotes a valve element which is displaceably provided in the valve casing 2. The valve element 8 is formed by bending a metal plate or the like into a tubular shape and extends in the axial direction as shown in FIG. The valve shaft 9, a cylindrical adsorption portion 10 made of a magnetic material or the like fixed to the base end side of the valve shaft 9, and a valve seat of the valve seat member 7 fixedly provided on the tip end side of the valve shaft 9. Spherical valve unit 1 which is seated on or seated at 7B
1 and 1.

Here, on the outer peripheral side of the valve portion 11, chamfered portions 11A which form a gap between the valve portion 11 and the inner peripheral side of the valve seat member 7 are provided at a plurality of positions in the circumferential direction, as shown in FIGS. Has been. A flat surface portion 11B corresponding to the surface shape of the annular wall portion 7D of the valve seat member 7 is provided on the tip end side of the valve portion 11.

When the valve body 8 is closed, its valve portion 1
1 is held in a state of being seated on the valve seat 7B of the valve seat member 7 by the spring force of the valve spring 15 which will be described later.
0 and the fuel inflow pipe 3 face each other with an axial gap therebetween. When power is supplied to the electromagnetic coil 12,
When a magnetic field is formed by the electromagnetic coil 12, the valve body 8
The adsorption portion 10 is magnetically adsorbed by the fuel inflow pipe 3, and is axially displaced against the spring force of the valve spring 15.
As a result, the valve body 8 is opened by the valve portion 11 separating from the valve seat 7B as shown in FIG.

Reference numeral 12 denotes an electromagnetic coil as an actuator provided on the outer peripheral side of the fuel inflow pipe 3, and the electromagnetic coil 12 is fixed between the valve casing 2 and the fuel inflow pipe 3 as shown in FIG. It is covered with a resin cover 13. Then, the electromagnetic coil 12 includes the resin cover 1
A magnetic field is generated by supplying power using the connector 14 provided on the valve 3, and the valve body 8 is opened.

Reference numeral 15 is a valve spring arranged in the fuel inflow pipe 3 in a compressed state.
It is provided between the cylindrical body 16 fixed inside and the valve body 8, and urges the valve body 8 toward the valve seat member 7 in the valve closing direction. When the valve body 8 opens against the spring force of the valve spring 15, the fuel in the fuel passage 6 is injected to the outside from the nozzle holes 18 and 19 of the nozzle plate 17, which will be described later.

Reference numeral 17 denotes a nozzle plate provided on the front end surface side of the valve seat member 7. The nozzle plate 17 is integrally formed of, for example, a circular metal plate as shown in FIGS. . The outer peripheral side of the nozzle plate 17 is fixed to the tip surface of the valve seat member 7, and the front surface side of the central portion thereof defines a clearance space 20 between the nozzle plate 17 and the opening groove portion 7E of the valve seat member 7. Further, nozzle holes 18 and 19 which will be described later are provided in a central portion of the nozzle plate 17.

Reference numeral 18 denotes a plurality of left nozzle holes formed penetrating the nozzle plate 17, and each left nozzle hole 18 passes through the center O of the nozzle plate 17 as shown in FIG. Is the X-X axis and the Y-Y axis, they are arranged side by side in an arc shape on the left side of the Y-Y axis. Further, as shown in FIG. 6, the left nozzle holes 18 have their axes OA-OA tilted leftward along the XX axis by a predetermined tilt angle α, and all the left nozzle holes 18 leftward. They extend parallel to each other in an inclined state.

Reference numeral 19 denotes a plurality of right nozzle holes formed so as to penetrate the nozzle plate 17, and each of the right nozzle holes 19 is Y
Arranged side by side in an arc shape on the right side of the -Y axis, and the axes OB-OB are inclined rightward along the XX axis by a predetermined inclination angle α, and all the right nozzle holes 19 are formed. Extend parallel to each other.

The left nozzle hole 18 and the right nozzle hole 19 are arranged side by side in a circular shape with a substantially constant interval, and a clearance is provided at a position radially outside the central opening 7D1 of the valve seat member 7. The opening faces the space 20. Further, when the valve body 8 is opened, as shown in FIG. 7, the fuel flowing into the clearance space 20 from the valve casing 2 side is easily injected from the nozzle holes 18 and 19 of the nozzle plate 17 to the left and right directions. It is possible to atomize the injected fuel at this time.

Reference numeral 20 denotes a circular clearance space defined between the opening groove portion 7E of the valve seat member 7 and the surface side of the nozzle plate 17, and the clearance space 20 includes the annular wall portion 7D, the opening groove portion 7E and the like. Has a clearance dimension b and a diameter D set by the above, and is formed as a flat clearance space in which the diameter D is formed larger than the clearance dimension b, and also in the radial direction from the central opening 7D1 of the valve seat member 7. It extends outside.

When the valve body 8 is opened, the fuel passage 6
When the fuel inside flows into the clearance space 20 from the central opening 7D1 of the valve seat member 7, this fuel forms a radial cross-flow in the clearance space 20 and flows radially outward in the clearance space 20, as described later, and the nozzle plate 17 nozzle holes 1
It is injected to the outside from 8 and 19. As a result, the clearance space 20 gives a radially outward flow velocity to the fuel injected from the nozzle holes 18 and 19, diffuses the fuel injection pattern in the radial direction, and promotes atomization of the injected fuel. is there.

On the other hand, 21 is a holding plate formed of a substantially annular metal plate or the like, and the holding plate 21 has its outer peripheral side welded to the small diameter cylindrical portion 2B of the valve casing 2 by a welding portion 21A as shown in FIG. The inner peripheral side is welded to the tip side of the valve seat member 7 together with the nozzle plate 17 by another welding portion 21B, and the valve seat member 7 and the nozzle plate 17 are fixed to the valve casing 2.

The fuel injection valve according to this embodiment has the above-mentioned structure, and its operation will be described below.

First, when the injection valve is operating, the electromagnetic coil 1
When power is supplied to the valve casing 2 via the connector 14, the valve body 8 has the adsorption portion 10 of the valve casing 2 by the electromagnetic coil 12,
It is magnetically attracted through the fuel inflow pipe 3 and the magnetic path forming member 5, and opens against the valve spring 15. As a result, the fuel in the fuel passage 6 flows into the center of the clearance space 20 from the injection port 7C of the valve seat member 7 through the central opening 7D1 as shown in FIG. A directed radial cross flow A is formed.

This fuel is used as the clearance space 20.
The nozzle holes 18, 19 of the nozzle plate 17 on the outer peripheral side of the
And is injected into the intake air side of the engine in the atomized state from the left nozzle hole 18 and the right nozzle hole 19, and the injection angle corresponds to the inclination angle α of the nozzle holes 18 and 19. It will be the size.

Now, referring to FIG. 8, the fuel injection pattern will be described. The fuel in the fuel passage 6 becomes a lateral flow A in the flat clearance space 20 and flows in the radial direction, so that the nozzle Even when jetted from the holes 18 and 19, the flow velocity in the radial direction is provided, and the overall flow velocity is in the radial direction Vr due to flowing in the clearance space 20 and the inclination direction of the nozzle holes 18 and 19. It has a magnitude obtained by vector-wise combining with the flow velocity Vα generated along the line.

In this case, for example, the fuel injected from the left nozzle hole 18 closest to the Y axis among the left nozzle holes 18 is
The flow velocity Vr and the nozzle hole 18 due to the clearance space 20,
The injection pattern F1 has a flow velocity V1 that is a combination of the flow velocity Vα of 19 and the Y-axis component of the flow velocity Vr and the X-axis component of the flow velocity Vα are large, so that the injection pattern F1 is in both the X-axis and Y-axis directions. The pattern shape is spread to some extent.

On the other hand, for example, the fuel injected from the left nozzle hole 18 closest to the X axis is the clearance space 20.
The Y-axis component of the flow velocity Vr due to
Since the axial component becomes large, the flow velocity V2, which is the combination of the flow velocity Vr and the flow velocity Vα, is largely biased in the X-axis direction.
As a result, the injection pattern F2 of the fuel injected from the left nozzle hole 18 becomes, for example, an elongated elliptical shape in which the dimension in the X-axis direction is greatly expanded and the dimension in the Y-axis direction is reduced. In addition to being able to largely diffuse, it is possible to promote the atomization.

Similarly, in the case of the right nozzle hole 19, the closer the position is to the X axis, the more the shape of the injection pattern can be diffused in the X axis direction.
The injection pattern of the entire fuel injected from 19 can be set as a horizontally long horseshoe shape spreading in the X-axis direction as shown in FIG. 8, for example.

Thus, in the present embodiment, the valve seat member 7
Since the clearance space 20 having a larger diameter than the central opening 7D1 is provided between the opening recessed groove 7E and the nozzle plate 17, the clearance space 2 is opened when the valve body 8 is opened.
A radial lateral flow A that flows radially outward from the central opening 7D1 side toward the nozzle holes 18 and 19 in 0 can be formed, and only the flow velocity Vα corresponding to the inclined direction of the nozzle holes 18 and 19 can be contained in the injected fuel. Instead, the radial flow velocity Vr can be provided by the clearance space 20.

As a result, even when the nozzle holes 18 and 19 of the nozzle plate 17 are arranged in a circular shape and are bored at a constant inclination angle α, the ejection pattern is inclined like the ejection pattern F2 in FIG. It can be widened radially outward than the range corresponding to the angle α, and the entire injection pattern can be stably diffused as a horseshoe shape, etc.
This can promote atomization of the injected fuel.

Therefore, according to the present embodiment, it is not necessary to complicate the shape and arrangement of the nozzle holes 18 and 19 in order to widen the ejection pattern, and the nozzle plate 1
7 can be easily formed, and even if the nozzle plate 17 is simplified, the fuel injection pattern can be appropriately set and the performance of the injection valve can be improved.

In this case, since the nozzle holes 18 and 19 of the nozzle plate 17 are opened in the clearance space 20 radially outside the central opening 7D1 of the valve seat member 7, the central opening is formed in the clearance space 20. The lateral flow A in the radial direction can be stably formed from the 7D1 side toward the nozzle holes 18 and 19, and the flow velocity in the radial direction can be reliably increased.

Although the nozzle holes 18 and 19 of the nozzle plate 17 are arranged side by side in a circular shape in the above-described embodiment, the present invention is not limited to this. For example, a plurality of nozzle holes may be doubled or arranged. A configuration in which three or more concentric circles are arranged side by side may be adopted.

Further, in the embodiment, the valve casing 2, the fuel inflow pipe 3, the magnetic path forming member 5 and the like of the casing 1 are configured as separate parts, but the present invention is not limited to this, and for example, the valve casing 2, The fuel inflow pipe 3, the magnetic path forming member 5 and the like may be integrally formed of a magnetic metal material to form a stepped tubular integral casing.

[0055]

As described in detail above, according to the invention of claim 1, an opening groove having a diameter larger than that of the central opening of the annular wall portion is provided on the front end side of the valve seat member. Since it is configured to define a clearance space between the nozzle plate and
When the valve body is opened, a radial lateral flow that flows radially outward from the central opening side toward each nozzle hole of the nozzle plate can be formed in the clearance space, and the injected fuel is provided with a radial velocity due to the clearance space. Can be given. As a result, the fuel injection pattern can be widely spread in the radial direction and diffused, and the atomization thereof can be promoted. Therefore, it is not necessary to complicate the shape and arrangement of the nozzle holes in order to widen the injection pattern, the nozzle plate can be easily formed, and the fuel injection pattern can be set appropriately to improve the performance of the injection valve. You can

Further, according to the invention of claim 2, since each nozzle hole of the nozzle plate is constructed to face the clearance space radially outside of the central opening of the valve seat member, the valve seat member of the valve seat member is opened. A lateral flow in the radial direction can be stably formed from the central opening side toward the nozzle hole.

According to the third aspect of the invention, the left nozzle hole and the right nozzle hole are arranged in parallel on the left and right sides of the nozzle plate, so that, for example, an intake valve of an engine or the like. The injection pattern can be easily formed on both the left and right sides in accordance with the arrangement, and the injected fuel can be injected through the clearance space so that the injected fuel has an injection pattern corresponding to the inclination angle of the nozzle hole. It can be spread over a wider range than the range.

Further, according to the invention of claim 4, since the nozzle holes are arranged side by side in a circular shape, when the injection valve is operated, fuel is injected from the nozzle holes arranged in a circular shape, for example. The flow velocity in the radial direction can be given to the injected fuel by the clearance space, and the fuel injection pattern can be greatly expanded even when the nozzle plate is simplified.

Further, according to the invention of claim 5, since the casing is constituted by the valve casing, the core member and the magnetic path forming member, the valve casing and the magnetic path forming member are actuated when the actuator composed of, for example, an electromagnetic coil is operated. A magnetic field can be formed between the core member and the valve body via the above, and the valve body can be opened magnetically.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a fuel injection valve according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a front end side of a valve casing.

FIG. 3 is a view showing a valve body, a valve seat member, a nozzle plate, etc.
It is a principal part expanded sectional view in the inside.

FIG. 4 is a partial cross-sectional view of the injection valve seen from the direction of arrows IV-IV in FIG.

FIG. 5 is a partial cross-sectional view of the injection valve as seen from the direction of arrow VV in FIG.

6 is an enlarged cross-sectional view of the main parts of the nozzle plate as viewed in the direction of arrows VI-VI in FIG.

FIG. 7 is an enlarged cross-sectional view of a main part of the state where the injection valve is opened, viewed from the same position as in FIG.

FIG. 8 is an explanatory diagram showing an injection pattern of fuel flowing through a clearance space.

[Explanation of symbols]

1 casing 2 valve casing 2A large diameter cylinder 2B small diameter cylinder 3 Fuel inflow pipe (core member) 4 connecting members 5 Magnetic path forming member 6 Fuel passage 7 Valve seat member 7A Valve body insertion hole 7B valve seat 7C injection port 7D annular wall 7D1 central opening 7E Opening groove 8 valve 9 valve shaft 10 Adsorption part 11 valve 11A chamfer 11B Flat surface part 12 Electromagnetic coil (actuator) 13 resin cover 14 connector 15 valve spring 16 cylinder 17 nozzle plate 18, 19 nozzle holes 20 clearance space 21 Presser plate 21A, 21B Welded part

Claims (5)

[Claims] 1. A valve casing provided with a fuel passage,
A valve seat member that is provided in the valve casing and has a valve seat formed surrounding the injection port, and a valve that is displaceably provided in the valve casing and that is seated on and off the valve seat of the valve seat member by operating an actuator. In the fuel injection valve including a body, the valve seat member has an annular wall portion that is located on the downstream side of the injection port and has a central opening, and the central portion that is located on the back side of the annular wall portion. An opening concave groove formed as a concave groove having a diameter larger than that of the opening is formed on the front end surface of the valve seat member, and the opening concave groove is closed on the front end surface side of the valve seat member. And a nozzle plate having a plurality of nozzle holes formed therein and defining a clearance space for causing a lateral flow of fuel between the fuel injection valve and the nozzle plate. 2. The fuel injection valve according to claim 1, wherein each of the nozzle holes is configured to open radially outward of a central opening of the valve seat member so as to face the clearance space. 3. The nozzle holes are arranged on both left and right sides of a central position of a nozzle plate, and the left nozzle hole on the left side of the nozzle holes is inclined leftward in parallel with each other. 3. The fuel injection valve according to claim 1, wherein the right nozzle hole located on the right side among the nozzle holes is configured to be inclined rightward in a state of being parallel to each other. 4. The fuel injection valve according to claim 1, wherein the nozzle holes are arranged side by side in a circular shape. 5. A core member is provided on the valve casing so as to face the valve body with a gap in the axial direction and the actuator is disposed on the outer peripheral side, and the valve casing and the core member are disposed on the outer peripheral side of the actuator. The fuel injection valve according to claim 1, 2, 3, or 4, wherein a magnetic path forming member that forms a magnetic path is provided between the valve casing, the core member, and the magnetic path forming member.