JP2001214839A - Fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize atomization and the injection direction of fuel by constituting nozzle holes of a nozzle plate out, of diametrally equal hole parts and diametrally expanded hole parts. SOLUTION: The nozzle plate 15 is installed in a valve casing of this fuel injection valve so as to be positioned on the tip side of a valve seat member, and the respective nozzle holes 16, 17 are composed of the diametrally equal hole parts 16A, 17A linearly extended with an equal hole diameter (d) and the diametrally expanded hole parts 16B, 17B formed by expanding a diameter in a taper shape. Thus, at fuel injection time, an injection flow rate and the injection direction of the fuel are decided by the diametrally equal hole parts 16A, 17A to expand the jet to a specific area by the diametrally expanded parts 16B, 17B to thereby hold a fuel atomized state while stabilizing directionality of injection fuel.

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 suitably used for injecting fuel into, for example, an automobile engine.

[0002]

2. Description of the Related Art In general, for example, a fuel injection valve used for an automobile engine or the like has a cylindrical valve casing provided with a fuel passage in an axial direction, and an injection port provided on an inner periphery on a distal end side of the valve casing. A valve seat member provided with a valve seat on the inner peripheral side so as to be surrounded, and a plurality of nozzle holes formed in a front end side of the casing facing the injection port of the valve seat member and penetrating in a plate thickness direction are formed. A valve plate that is inserted into the fuel passage of the valve casing and has a base end side serving as an adsorbing portion, and a distal end side serving as a valve portion that is separated from and seated on a valve seat of the valve seat member; And an electromagnetic actuator which is provided on the base end side of the valve and energizes the suction portion of the valve element by applying a current to open the valve element (for example, Japanese Patent Application Laid-Open No. H11-70347).

[0003] This type of prior art fuel injection valve includes:
A nozzle plate is provided on the tip side of the valve casing and covers the injection port of the valve seat member.
For example, it is formed by pressing a thin metal plate or the like. In the nozzle plate, a plurality of nozzle holes each having a cylindrical peripheral wall are formed so as to penetrate therethrough, and these nozzle holes extend linearly with the same hole diameter in the length direction.

[0004] When the valve body is opened, fuel supplied into the valve casing is injected from each nozzle hole toward an intake port of the engine or the like. At this time, the nozzle hole is predetermined according to the hole diameter. The fuel is injected at a reduced flow rate and the fuel is atomized.

In another conventional technique described in, for example, JP-A-7-63140, a nozzle plate is
By forming a nozzle hole whose diameter is increased in a tapered shape in the fuel injection direction, atomization of the injected fuel is promoted.

[0006]

By the way, in the above-mentioned prior art, a cylindrical nozzle hole having a constant diameter in the longitudinal direction is formed, and fuel is atomized and injected from the nozzle hole. And In this case, since the fuel injected from the nozzle hole is more likely to be atomized as the hole diameter is smaller, there is a demand in the prior art to make the hole diameter of the nozzle hole as small as possible.

However, the fuel particles injected from such a cylindrical nozzle hole form a jet having a high particle density in a narrow area corresponding to a minute hole diameter, and a part of the fuel particles is formed. In the prior art, there is a problem that it is difficult to sufficiently atomize the fuel injected from the nozzle holes because the particles are likely to be combined after the injection to increase the particle diameter.

Further, in the other prior art, the nozzle hole is simply formed by expanding the diameter of the nozzle hole in a tapered shape, and the fuel injected from the nozzle hole easily spreads conically along the peripheral wall. Therefore, the fuel injection direction may be unstable, and the fuel may not be injected at a desired position with respect to an intake port of the engine.

SUMMARY OF THE INVENTION 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 promote atomization of fuel injected from a nozzle hole and to stabilize the fuel injection direction. It is an object of the present invention to provide a fuel injection valve as described above.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cylindrical valve casing provided with a fuel passage in an axial direction, and an injection port provided on an inner periphery at a distal end side of the valve casing. And a valve seat member provided with a valve seat on the inner peripheral side, and a plurality of nozzle holes formed in the front end side of the casing facing the injection port of the valve seat member and penetrating in a plate thickness direction. A nozzle plate provided in the fuel passage of the valve casing, a valve body having a base end side serving as an adsorbing portion, and a distal end side serving as a valve portion detachably seated with respect to a valve seat of the valve seat member. The present invention is applied to a fuel injection valve comprising an electromagnetic actuator which is provided on a base end side of a casing and attracts an adsorbing portion of the valve body by energizing to open the valve body.

A feature of the structure adopted by the first aspect of the invention is that the nozzle hole is opened in the inner surface of the nozzle plate and extends linearly from the inner surface to an intermediate position in the plate thickness direction with the same hole diameter. The present invention is characterized by comprising a formed equal-diameter hole, and a diameter-expanded hole formed by expanding the diameter from the equal-diameter hole toward the outer surface of the nozzle plate and opening to the outer surface.

With this configuration, when the valve body is opened, the fuel flowing into the equal-diameter hole portion of the nozzle hole can be injected from the enlarged-diameter hole portion to the outside, and the fuel injection flow rate can be reduced. The injection direction can be determined along the length direction of the equal-diameter hole portion. Also, when the fuel is ejected from the enlarged diameter hole, the jet spreads to a certain area along the peripheral wall of the enlarged diameter hole. Coupling can be reduced. Therefore, it is possible to maintain the state in which the fuel is atomized by the enlarged diameter hole while forming the fuel jet along the length direction of the equal diameter hole.

On the other hand, a feature of the structure adopted by the invention of claim 2 is that the nozzle hole is opened in the inner surface of the nozzle plate and linearly extends from the inner surface to an intermediate position in the plate thickness direction with the same hole diameter. A first large diameter hole formed, a large diameter hole formed by expanding the inside of the nozzle plate in the thickness direction from the first large diameter hole, The present invention is characterized in that the nozzle plate is formed to extend linearly with the same hole diameter toward the outer surface of the nozzle plate and to have a second equal-diameter hole portion opened to the outer surface.

Thus, the fuel injection flow rate can be determined according to the hole diameter of the first constant diameter hole, and the injection direction can be determined along the length direction of the first constant diameter hole. In addition, the injected fuel flows through the second equal-diameter hole in a state of being spread to a certain area by the enlarged-diameter hole, and then is ejected to the outside. Can be further stabilized.

Further, as in the invention of claim 3, the axis of the nozzle hole is formed so as to be inclined with respect to the plate thickness direction of the nozzle plate, so that the injected fuel can be directed in a plurality of directions along the axis of each nozzle hole. And can be injected.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings, taking a fuel injection valve used for an automobile engine or the like as an example.

FIGS. 1 to 5 show a fuel injection valve according to a first embodiment of the present invention.

Reference numeral 1 denotes a cylindrical valve casing which forms the main body of the fuel injection valve. The valve casing 1 is formed in a stepped cylindrical shape from a magnetic material such as electromagnetic stainless steel. The valve casing 1 has a resin cover 1 to be described later on the base end side.
9 comprises a large-diameter cylindrical portion 1A and a small-diameter cylindrical portion 1B integrally formed on the distal end side of the large-diameter cylindrical portion 1A. Inside the fuel passage 2, a valve body 8 described later is inserted. It is provided in the axial direction.

Reference numeral 3 denotes a cylindrical connecting member fixed to the base end side of the valve casing 1. The connecting member 3 is formed of a non-magnetic material, and is interposed between the valve casing 1 and a fuel inflow pipe 4 described later. are doing.

Reference numeral 4 denotes a cylindrical fuel inflow pipe formed of a magnetic material such as electromagnetic stainless steel. The fuel inflow pipe 4 is fixed to the base end side of the valve casing 1 by using a connecting member 3. The distal end communicates with the fuel passage 2. A fuel filter 5 is provided on the inner periphery of the fuel inlet pipe 4 on the base end side.

Here, the fuel inflow pipe 4 and the valve casing 1 are magnetically connected via a connecting core 6 made of a magnetic metal piece or the like attached to the outer peripheral side thereof. When the electromagnetic coil 12 described later is energized, a closed magnetic path is formed between the valve casing 1, the fuel inflow pipe 4, the connecting core 6, and the attraction portion 10 of the valve body 8 described later.

Reference numeral 7 denotes a substantially cylindrical valve seat member provided with a small gap in the small-diameter cylindrical portion 1B of the valve casing 1. A circular-shaped valve seat member 7 has a circular shape as shown in FIG. The injection port 7A is formed to be open, and a substantially conical valve seat 7B surrounding the injection port 7A is provided on the inner peripheral side of the valve seat member 7.

Numeral 8 denotes a valve element which is provided so as to be inserted into the fuel passage 2 of the valve casing 1. As shown in FIG.
A valve shaft 9 formed in a substantially cylindrical shape by bending a metal plate or the like, a cylindrical suction portion 10 made of a magnetic material or the like fixed to the base end side of the valve shaft 9, and a distal end of the valve shaft 9 Spherical valve portion 1 which is fixedly mounted on the side and is detachably seated on the valve seat 7B of the valve seat member 7.
And 1.

Here, the base end face of the adsorbing portion 10 faces the fuel inflow pipe 4 with a gap in the axial direction interposed therebetween, and the size of this gap is adjusted in advance as the lift amount of the valve element 8. Further, a plurality of locations are chamfered on the outer peripheral side of the valve portion 11.

When the attraction portion 10 is magnetically attracted by the electromagnetic coil 12 or the like, the valve element 8 is displaced in the axial direction against a valve spring 13 described later, and the valve portion 11 is moved to the valve seat member 7. The valve is opened with a constant lift amount from the valve closing position seated on the valve seat 7B to the valve opening position where the adsorbing section 10 contacts the fuel inflow pipe 4.

Reference numeral 12 denotes an electromagnetic coil as an electromagnetic actuator fixedly provided in the resin cover 19 on the base end side of the valve casing 1. The electromagnetic coil 12 is energized from the outside by using a connector 20 described later. This magnetically attracts the suction portion 10 of the valve body 8 to open the valve body 8.

Reference numeral 13 denotes a valve spring composed of a compression spring disposed in the fuel inflow pipe 4. The valve spring 13 is a cylinder 14 fixed to the upstream side of the fuel inflow pipe 4 and a base end of the valve 8. And urges the valve body 8 in the valve closing direction.

Reference numeral 15 denotes a nozzle plate fixedly provided in the small-diameter cylindrical portion 1B of the valve casing 1 by a holding plate 18 described later. The nozzle plate 15 has a circular plate shape as shown in FIGS. Formed as a sheet metal
It has a predetermined thickness t.

The nozzle plate 15 has an inner surface 15.
A is attached to the valve seat member 7 in FIG. 2, and a central portion thereof faces the injection port 7A of the valve seat member 7 and an outer surface 15B.
Has a central portion facing the outside through the inner peripheral side of the holding plate 18. When the valve element 8 is opened, the nozzle plate 15 injects the fuel flowing out from the injection port 7A of the valve seat member 7 in a state where the fuel is atomized from nozzle holes 16 and 17 described later.

Numerals 16, 16,... Indicate a number of left nozzle holes formed at the center left side of the nozzle plate 15 and penetrating in the thickness direction. And the left nozzle hole 16 is
As shown in FIGS. 3 and 4, for example, it is disposed on the left side of the YY axis extending upward and downward through the central axis OO of the nozzle plate 15, and has a central axis OO as described later. It is inclined leftward with respect to the parallel line OA-OA by an inclination angle αA, and is arranged in a double concentric circle with a right nozzle hole 17 described later formed in the center right of the nozzle plate 15.

As shown in FIG. 4, the nozzle hole 16 has an equal-diameter hole portion 16A located on the fuel inflow side and having a cylindrical peripheral wall centered on the axis AA, and a fuel injection side. And formed coaxially with the equal-diameter hole 16A and having an enlarged-diameter hole 16B having a substantially conical peripheral wall.
In addition, the axis AA of the left nozzle hole 16 is at a left angle to the line OA-OA parallel to the central axis OO of the nozzle plate 15 by a predetermined inclination angle αA corresponding to, for example, the arrangement of the intake port of the engine. It is formed to be inclined in the direction.

Then, the base end side of the equal-diameter hole portion 16A is opened at the inner side surface 15A of the nozzle plate 15, and
It extends linearly with the same hole diameter d from 5A to an intermediate position in the thickness direction. This hole diameter d is the same as the nozzle hole 1.
6 determines the fuel injection flow rate. further,
The equal-diameter hole portion 16A has a length L along the axis A-A located between the center position of the base end opening and the distal end side.

On the other hand, the enlarged diameter hole portion 16B has a hole diameter d at the base end side equal to the equal diameter hole portion 16A, and is tapered from the equal diameter hole portion 16A toward the outer surface 15B of the nozzle plate 15. And the hole diameter is conically increased with a predetermined spread angle θ. Also,
The distal end side of the enlarged diameter portion 16 </ b> B is open to the outer surface 15 </ b> B of the nozzle plate 15.

Reference numerals 17, 17,... Indicate a number of right nozzle holes formed on the right side of the center of the nozzle plate 15. The right nozzle hole 17 is disposed, for example, on the right side of the YY axis of the nozzle plate 15 as shown in FIGS. 3 and 4, and its axis BB is a line OB parallel to the central axis OO. −
It is inclined rightward with respect to OB by an inclination angle αB. Also, the right nozzle hole 17 is substantially the same as the left nozzle hole 16,
It is composed of an equal-diameter hole 17A and an enlarged-diameter hole 17B.

Reference numeral 18 denotes a holding plate formed of a substantially annular metal plate or the like. As shown in FIG. 2, the holding plate 18 is welded on its outer peripheral side to a small-diameter cylindrical portion 1B of the valve casing 1 by a welding portion 18A. The inner peripheral side is another welded part 18B
Is welded to the distal end face of the valve seat member 7 together with the nozzle plate 15, and thereby the nozzle plate 15
And the valve seat member 7 are fixed in the valve casing 1.

When the fuel injection valve is assembled, the valve seat member 7 is displaced in the axial direction in the casing 1 by welding the presser plate 18 and then pushing it from the front end side to cause plastic deformation. Adjust the lift amount. Although the nozzle plate 15 is attached to the valve casing 1 using a separate holding plate 18, the nozzle plate 15 and the holding plate 18 are formed integrally in advance,
These may be attached to the valve casing 1.

Reference numeral 19 denotes a large-diameter cylindrical portion 1 of the valve casing 1.
A resin cover attached so as to cover A and the like. The resin cover 19 is provided with a connector 20 as shown in FIG. Further, 21 is a small-diameter cylindrical portion 1B of the valve casing 1.
The protector 21 protects the nozzle plate 15 and the like.

The fuel injection valve according to the present embodiment has the above-described configuration, and its operation will now be described.

First, fuel is supplied to the fuel passage 2 in the valve casing 1 from the base end side of the fuel inflow pipe 4.
When the electromagnetic coil 12 is energized through the connector 20, the valve body 8 is magnetically attracted to the adsorbing portion 10 by the electromagnetic coil 12 via the valve casing 1, the fuel inflow pipe 4, and the connection core 6. The valve is opened against the valve spring 13. Thereby, the fuel in the fuel passage 2 branches from the nozzle holes 16 and 17 of the nozzle plate 15 in the left and right directions in FIG. 4 and is injected in an atomized state.

When fuel is injected from the left nozzle hole 16, for example, the fuel flowing from the injection port 7A of the valve seat member 7 into the equal-diameter hole portion 16A passes through the inside of the equal-diameter hole portion 16A along the axis A.
-A flows along the length L, and the flow rate is determined according to the hole diameter d of the equal diameter hole portion 16A, and the fuel injection direction is set according to the inclination angle αA inclined leftward. .

When the fuel is ejected from the enlarged diameter portion 16B to the outside, the jet of the fuel spreads along the peripheral wall of the enlarged diameter portion 16B to a certain area corresponding to the expansion angle θ. Fuel particles are prevented from becoming overcrowded and the bonds between particles are reduced. As a result, the fuel injected from the left nozzle hole 16 forms a jet along the axis A-A and keeps the atomized state. Also, the right nozzle hole 17
In the same manner, the fuel injected from the nozzles also keeps the atomized state while forming a jet along the direction of the axis BB.

On the other hand, when manufacturing the nozzle plate 15,
As shown in FIG. 5, nozzle holes 16 and 17 are formed in a nozzle plate 15 formed in advance by press working or the like using a jig 22 such as a drill or a punch. In this case, the jig 22 is provided with a blade tip 2 formed in an elongated cylindrical shape.
2A and a substantially conical tapered blade portion 22B are provided.

When the nozzle hole 16 is formed, for example, the jig 22 is first advanced into the nozzle plate 15 along the axis AA so that the blade tip portion 22A causes the nozzle hole 16 to have the same diameter 16A. The jig 22 is pulled out from the nozzle hole 16 after forming the enlarged diameter portion 16B by the tapered blade portion 22B.

Thus, in the present embodiment, the left nozzle hole 16 is constituted by the equal-diameter hole portion 16A and the enlarged-diameter hole portion 16B, and the right nozzle hole 17 is constituted substantially similarly to the nozzle hole 16. The flow rate of the fuel injected from the nozzle hole 16 can be set according to the hole diameter d of the equal-diameter hole portion 16A, and the fuel flows through the linear equal-diameter hole portion 16A by the length L, whereby the fuel can be supplied. The injection direction is indicated by the axis A in FIG.
−A can be stably determined.

When the fuel is ejected from the enlarged diameter portion 16B to the outside, the fuel jet can spread along the peripheral wall of the enlarged diameter portion 16B to a certain area corresponding to the expansion angle θ. Thereby, it is possible to suppress the fuel particles contained in the jet from becoming too dense and to reduce the coupling between the particles. Similarly, the injection direction of the fuel injected from the right nozzle hole 17 is determined along the axis BB by the equal diameter hole portion 17A, and the coupling between the fuel particles is suppressed by the enlarged diameter hole portion 17B. it can.

Therefore, according to the present embodiment, when fuel is injected from the nozzle holes 16 and 17, the jet is expanded while forming the jet stably along the length direction of the equal diameter holes 16A and 17A. Atomization of the fuel can be promoted by the radial holes 16B and 17B, and the fuel injection performance can be improved as compared with the conventional technology.

Further, since the axis AA and the axis BB of the left nozzle hole 16 and the right nozzle hole 17 are inclined leftward and rightward in FIG. The nozzle plate 15 can branch and inject fuel from the nozzle holes 16 and 17 leftward and rightward, for example, in accordance with the arrangement of the intake ports of the engine.

On the other hand, the nozzle holes 16 and 17 are provided with enlarged diameter holes 16.
B, 17B, the jig 2
2 can be prevented from being broken. That is, for example, when a cylindrical nozzle hole 23 as shown by a virtual line in FIG.
When the axes are displaced in the radial direction when pulling out
Since a radial pressing force is applied to the tip of the cutting edge 22A of the jig 22 from the corner 23A of the peripheral wall located at the opening end of the nozzle hole 23, the cutting edge 22A is easily broken.

However, in the present embodiment, the jig 22 is simply advanced into the nozzle plate 15 to the position of the tapered blade portion 22B, and the equal-diameter holes 16A, 16A of the nozzle holes 16, 17 are formed.
17A and the enlarged diameter holes 16B, 17B can be easily formed, and when the jig 22 is pulled out, the enlarged diameter holes 16B, 1B can be formed.
7B can prevent external force from being applied to the blade edge portion 22A, and can increase the manufacturing efficiency of the nozzle plate 15.

FIG. 6 shows a second embodiment according to the present invention. The feature of this embodiment is that the nozzle hole is constituted by first and second equal-diameter holes and an enlarged-diameter hole. It has been done. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes a nozzle plate according to the present embodiment. The nozzle plate 31 has a plate thickness t having an inner side surface 31A and an outer side surface 31B substantially in the same manner as in the first embodiment.
, A central portion of which has a number of left nozzle holes 32, 32,... (Only one shown) extending along the axis A-A, and a number of left nozzle holes 32 extending along the axis BB. Are formed.

However, in the present embodiment, the left nozzle hole 3
2 is a first equal-diameter hole portion 32A, an enlarged-diameter hole portion 32B, and a second
Of the same diameter 32C.

In this case, the base end side of the equal-diameter hole portion 32A is opened at the inner side surface 31A of the nozzle plate 31 in substantially the same manner as the equal-diameter hole portion 16A of the nozzle hole 16 according to the first embodiment. It is formed to extend linearly with the same hole diameter d and length L from the side surface 31A to the middle position in the plate thickness direction. In addition, the diameter-enlarged hole 32B is formed by expanding the inside of the nozzle plate 31 in the thickness direction from the equal-diameter hole 32A,
Has a divergence angle θ. However, the length dimension of the enlarged diameter portion 32B is shorter in the axial direction than in the first embodiment.

The second equal-diameter hole portion 32C is formed to extend linearly from the enlarged-diameter hole portion 32B toward the outer surface 31B of the nozzle plate 31 with the same hole diameter.
1B. And this opening part is axis A-
It has a hole diameter D centering on A.

On the other hand, the right nozzle hole 33 is also
In the same manner as in the first embodiment, the first equal-diameter hole portion 33A and the enlarged-diameter hole portion 33B
And a second equal-diameter hole 33C.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained. And especially in this embodiment,
The left nozzle hole 32 is provided with a first equal-diameter hole portion 32A and an enlarged-diameter hole portion 32.
B and the second equal-diameter hole portion 32C, and the right nozzle hole 33 is configured in substantially the same manner as the left nozzle hole 32.
The fuel injected from the nozzle holes 32, 33
2B, 33B, it is possible to circulate in the linear equal-diameter holes 32C, 33C in a state of being spread to a certain area, and thereafter, it can be ejected to the outside. As a result, the equal-diameter hole 32
C and 33C can further stabilize the fuel injection direction.

In each of the above embodiments, the nozzle hole 1
Although the axes AA and BB of 6, 17, 32 and 33 are inclined with respect to the thickness direction of the nozzle plates 15 and 31, the present invention is not limited to this. The nozzle plate may be formed vertically along the thickness direction of the nozzle plate so that the inclination angle α = 0 °.

In each of the above embodiments, the spherical valve portion 11 is provided at the tip end of the valve body 8. However, the present invention is not limited to this. For example, a needle valve body having a conical valve portion is provided. The present invention may be applied to a fuel injection valve provided with.

[0059]

As described above in detail, according to the first aspect of the present invention, since the nozzle hole is constituted by the equal-diameter hole portion and the enlarged-diameter hole portion, the fuel injection flow rate through the nozzle hole can be reduced. The fuel injection direction can be stably determined along the length direction of the equal-diameter hole portion. When the fuel is ejected from the enlarged diameter hole to the outside, the fuel jet can spread to a certain area along the peripheral wall of the enlarged diameter hole, thereby causing the fuel particles contained in the jet to be overcrowded. And the bonding between particles can be reduced. Therefore, the nozzle hole can promote the atomization of the fuel by the enlarged diameter hole while stably forming the jet of the fuel along the length direction of the equal diameter hole portion. Performance can be improved.

On the other hand, according to the second aspect of the present invention, the nozzle hole is constituted by the first equal-diameter hole, the enlarged-diameter hole, and the second equal-diameter hole. The fuel injection direction can be set according to the hole diameter of the first constant diameter hole, and the fuel injection direction can be stably determined along the length direction of the first constant diameter hole. The injected fuel can flow through the second equal-diameter hole in a state where the injected fuel has spread to a certain area by the enlarged-diameter hole,
After that, it can be blown out. As a result, the fuel injection direction can be further stabilized by the second equal diameter hole.

Further, according to the third aspect of the present invention, since the axis of the nozzle hole is formed so as to be inclined with respect to the thickness direction of the nozzle plate, the nozzle plate can be arranged, for example, in the position of the intake port of the engine. Correspondingly, fuel can be branched and injected in a plurality of directions.

[Brief description of the drawings]

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

FIG. 2 is an enlarged cross-sectional view of a main part in FIG. 1 showing an enlarged front end side of a valve casing.

FIG. 3 is a plan view showing a nozzle plate.

FIG. 4 is an enlarged sectional view of a central portion of a nozzle plate viewed from a direction indicated by arrows IV-IV in FIG. 3;

FIG. 5 is an enlarged cross-sectional view showing a state in which a nozzle hole is formed using a drill or the like.

FIG. 6 is an enlarged sectional view showing a nozzle plate according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve casing 2 Fuel passage 3 Connecting member 4 Fuel inflow pipe 5 Fuel filter 6 Connecting core 7 Valve seat member 7A Injection port 7B Valve seat 8 Valve body 9 Valve shaft 10 Adsorption part 11 Valve part 12 Electromagnetic coil (electromagnetic actuator) 13 Valve Spring 15, 31 Nozzle plate 16, 17, 32, 33 Nozzle hole 16A, 17A Uniform hole 16B, 17B, 32B, 33B Enlarged hole 18 Holding plate 32A, 33A First equal diameter hole 32C, 33C 2 equal diameter holes

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mikio Kazizuka 1370 Onna, Atsugi-shi, Kanagawa Prefecture Inside Unisia Gex Co., Ltd. 72) Inventor Kuniharu Suzuki 1370 Onna, Atsugi-shi, Kanagawa Prefecture F-term in Unisia Gex Co., Ltd. 3G066 AA01 AB02 AD10 BA01 BA03 CC06U CC14 CC15 CC18 CC20 CC24 CC26 CC48 CE22 CE31

Claims (3)

[Claims] 1. A cylindrical valve casing provided with a fuel passage in an axial direction, and a valve seat member provided on an inner periphery of a distal end side of the valve casing and surrounding an injection port and having a valve seat on an inner peripheral side thereof. When,
A nozzle plate which is provided on the tip end side of the casing facing the injection port of the valve seat member and has a plurality of nozzle holes formed therethrough in a plate thickness direction; and provided so as to be inserted into a fuel passage of the valve casing. A valve body having a base end side serving as an adsorbing portion and a distal end side serving as a valve portion detachably seated on the valve seat of the valve seat member, and an adsorbing portion of the valve body provided on the base end side of the valve casing by being energized. Wherein the nozzle hole is opened on the inner surface of the nozzle plate and has a linear shape with an equal hole diameter from the inner surface to a position halfway in the plate thickness direction. And a large-diameter hole formed so as to extend toward the outer surface of the nozzle plate from the equal-diameter hole and opened to the outer surface. And the fuel injection valve. 2. A cylindrical valve casing provided with a fuel passage in an axial direction, and a valve seat member provided on an inner periphery at a distal end side of the valve casing and provided with a valve seat on an inner peripheral side surrounding an injection port. When,
A nozzle plate which is provided on the tip end side of the casing facing the injection port of the valve seat member and has a plurality of nozzle holes formed therethrough in a plate thickness direction; and provided so as to be inserted into a fuel passage of the valve casing. A valve body having a base end side serving as an adsorbing portion and a distal end side serving as a valve portion detachably seated on the valve seat of the valve seat member, and an adsorbing portion of the valve body provided on the base end side of the valve casing by being energized. Wherein the nozzle hole is opened on the inner surface of the nozzle plate and has a linear shape with an equal hole diameter from the inner surface to a position halfway in the plate thickness direction. A first equal-diameter hole formed so as to extend
A diameter-enlarging hole formed by expanding the inside of the nozzle plate in the thickness direction from the equal-diameter hole, and linearly extending from the diameter-enlarging hole toward the outer surface of the nozzle plate with an equal diameter. And a second equal-diameter hole portion formed on the outer surface and formed on the outer surface. 3. The fuel injection valve according to claim 1, wherein an axis of the nozzle hole is formed to be inclined with respect to a thickness direction of the nozzle plate.