JPH0861183A - Solenoid fuel injection valve and its injection quantity regulating method - Google Patents

Abstract

PURPOSE: To provide a solenoid fuel injection valve having a structure by which a fuel injection quantity is easily regulated and part control and installing work are facilitated. CONSTITUTION: When an injection quantity is regulated, after a needle valve 27 is inserted in a guide hole 29a of a valve body 29, a stopper plate 11 is installed on an end surface 29b of the valve body 29, and a lift quantity or a flow rate of the needle valve 27 is measured. As a measured result, whether a measured quantity is a target lift quantity or flow rate is judged, and when the measured quantity is not the target lift quantity or flow rate, the stopper plate 11 having a desired step difference quantity is selectively installed until it becomes the target lift quantity or flow rate. Therefore, an injection quantity can be easily and inexpensively regulated by taking out a step difference quantity of a prescribed dimension of a step difference surface 11b of the stopper plate 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic fuel injection valve, and more particularly to a fuel injection device for an internal combustion engine which can easily adjust the fuel injection amount to obtain a desired fuel injection amount. It is a thing.

[0002]

2. Description of the Related Art A conventionally known electromagnetic fuel injection valve includes a valve body having an injection hole and a valve seat, and a valve member having an abutting portion and moved in the valve body. There is. The valve member has a closed position where its abutting portion abuts the valve seat to stop the fuel supply to the internal combustion engine, and an open position where the abutting portion is separated from the valve seat to allow the fuel supply to the internal combustion engine. The position is driven by an electromagnetic actuator.

The injection amount of such a fuel injection valve is determined by the energization time (valve opening time) of the electromagnetic actuator, the pressure of the fuel introduced into the valve body, the properties of the fuel, and the like. The injection amount is adjusted by the lift amount of the valve member before valve assembly. The lift amount of this valve member is
It is determined by the open position of the valve member, which is the position where the valve member is farthest from the valve seat of the valve body,
When adjusting the injection amount, the lift amount is adjusted by a stopper plate that prohibits further lift of the valve member.

As another conventional adjusting method for adjusting the injection amount of the fuel injection valve, a fitting disc is engaged between a stopper plate for restricting the lift amount of the valve member and the contact surface of the valve member, A method is known in which the lift amount of the valve member is adjusted by adjusting the number of fitting discs. As the number of the fitting discs increases, the bite distance between the stopper plate and the valve member increases, so that the lift amount of the valve member is reduced and the injection amount is reduced. When the number of plates is reduced, the lift amount increases and the injection amount increases. With this, by selecting an appropriate number of fitting discs, the injection amount is adjusted by setting the distance between the stopper plate and the contact surface of the valve member to the desired distance.

[0005]

However, in the conventional method of adjusting the static injection amount as described above, (1) the valve size is not uniform (variation), the size error during assembly, etc. In addition to changing the lift amount of the member, (2) In the method of adjusting the injection amount by selecting the number of fitting disks to be caught between the stopper plate and the valve member, separate parts such as the fitting disk are used. Since it is necessary, the number of parts is increased, and since the number of fitting discs is plural, parts management, injection amount adjustment work, and the like are complicated.

An object of the present invention is to provide an electromagnetic fuel injection valve having a structure that facilitates adjustment of the fuel injection amount. It is another object of the present invention to provide an electromagnetic fuel injection valve that facilitates parts management and assembly work when adjusting the injection amount. Still another object of the present invention is to provide an injection amount adjustment method for an electromagnetic fuel injection valve, which facilitates adjustment of the fuel injection amount.

[0007]

In order to solve the above-mentioned problems, an electromagnetic fuel injection valve according to claim 1 of the present invention comprises a valve body having an injection hole and a valve seat connected to the injection hole, and an abutting portion. The abutment portion has a closed position where it abuts the valve seat to stop the supply of fuel to the internal combustion engine, and the abutment portion is separated from the valve seat to supply fuel to the internal combustion engine. A valve member movably provided between an allowable open position, an elastic member for urging the valve member toward the closed position, and the valve member for opening the valve member against the urging force of the elastic member. A stopper plate having an electromagnetic actuator that is moved to a position, a contact surface that contacts the end surface of the valve body, and a step surface that contacts the shoulder of the valve member when the valve member is in the open position. It is characterized by that.

According to a second aspect of the present invention, in the electromagnetic fuel injection valve according to the first aspect, the step surface is formed in a convex shape or a concave shape on the center side of the contact surface. An injection amount adjusting method of an electromagnetic fuel injection valve according to claim 3 has an injection hole, a valve main body having a valve seat continuous with the injection hole and a guide hole continuous with the valve seat, and an abutting portion,
The abutment portion abuts the valve seat to stop the supply of fuel from the guide hole to the injection hole, and the abutment portion is separated from the valve seat to the guide hole to the injection hole. The valve member movably provided between the valve body and the open position allowing the fuel supply, the contact surface contacting the end surface of the valve body, and the convex or concave shape on the center side of the contact surface. And a stopper plate having a step surface that abuts against the shoulder of the valve member when the valve member is in the open position, the injection amount adjusting method for an electromagnetic fuel injection valve, the valve being provided in the guide hole. After inserting the member, attach the stopper plate to the end face of the valve body, measure the lift amount or flow rate of the valve member, and as a result of the measurement, determine whether the measured amount is the target lift amount or flow rate. , If the measured amount is not the target lift amount or flow rate, the target Wherein the assembled select the stopper plate with the desired step amount until the lift amount or flow.

[0009]

According to the present invention, the lift amount of the valve member is conventionally adjusted by machining the contact surface which requires a high degree of machining accuracy. However, in the present invention, the step surface of the stopper plate is provided. Therefore, the injection amount can be adjusted easily and inexpensively by producing a step amount having a predetermined size on the step surface.

When adjusting the injection amount, the lift amount or flow rate of the valve member is measured, and as a result of the measurement, it is judged whether the measured amount is the target lift amount or flow rate. The measured amount is the target lift amount or flow rate. If not, a stopper plate having a desired step amount is selected and assembled until the target lift amount or flow rate is reached. At this time, the injection amount can be easily adjusted by selecting the stopper plate having the required step amount.

[0011]

Embodiments of the electromagnetic fuel injection valve of the present invention will be described below with reference to the drawings. (First Embodiment) In the first embodiment, the electromagnetic fuel injection valve of the present invention is applied to a fuel supply device for a gasoline engine.

As shown in FIG. 2, the fuel injection valve 20 has an axially fixed iron core 2 in a valve casing 26 made of a magnetic material.
1, a movable iron core (plunger) 25, a needle valve 27 as a valve member, and a valve body 29 are assembled. The movable iron core 25 and the needle valve 27, which are slidable in the axial direction, are biased in the valve closing direction by the compression coil spring 28 housed in the fixed iron core 21, and the contact portion 6 formed at the tip of the needle valve 27. Is seated on the valve seat 7 of the valve body 29.

An electromagnetic coil 33 is provided on the outer periphery of the fixed iron core 21.
Is provided. The electromagnetic coil 33 is wound around a spool 32 fixed to the outer peripheral surface of the fixed iron core 21. The terminal 34 electrically connected to the electromagnetic coil 33 includes a connector 35 made of synthetic resin and an extension 32 of the spool 32.
embedded in a. A hole for taking out the terminal 34 to the connector 35 side is formed in the flange portion 21c of the fixed iron core 21. Then, when an electric signal for injection control is transmitted from the electronic control unit (not shown) to the terminal 34 through the wire harness, an exciting current flows through the electromagnetic coil 33,
The movable iron core 25 and the needle valve 27 move in the valve opening direction against the biasing force of the compression coil spring 28 by the suction force generated in the fixed iron core 21.

The fuel pumped from the fuel tank by an oil pump or the like is introduced into the fuel injection valve 20 through a connector pipe 23 formed integrally with the fixed iron core 21. The connector pipe 23 is provided at an end of the fixed iron core 21 opposite to the movable iron core 25, and a filter 24 for removing foreign matters in the fuel is fixed in the connector pipe 23. A through hole 21a is formed in the fixed iron core 21 in the axial direction. An adjusting pipe 43 that guides the fuel in the connector pipe 23 to the movable iron core 25 side is inserted into the through hole 21a. The adjusting pipe 43 is the connector pipe 2 of the adjusting pipe 43.
A compression coil spring 28 is supported at the end opposite to 3. Therefore, the biasing force of the compression coil spring 28 is adjusted by changing the position of fixing the adjusting pipe 43 in the through hole 21a in the axial direction.

A valve body 29 is provided on the outer peripheral surface of the needle valve 27.
Guide portions 45 and 46 that slide in the guide holes 29a are formed at predetermined intervals, and grooves 45a and 46a are formed in the axial direction of the guide portions 45 and 46. The fuel passing through the adjusting pipe 43 passes through the gap between the valve casing 26 and the movable iron core 25, flows out into the hollow portion 44, and reaches the injection hole 8 from the hollow portion 44 through the grooves 45a and 46a.

Between the fixed iron core 21 and the spool 32,
An O-ring 37 is provided, and an O-ring 38 is provided between the spool 32 and the valve casing 26. Further, an O-ring 39 is provided between the valve body 29 and the valve casing 26.
Is provided. The O-ring 37, the O-ring 38, and the O-ring 39 prevent the fuel introduced into the fuel injection valve 20 from flowing out.

Next, the structure of the discharge portion 50 of the fuel injection valve 20 will be described. As shown in FIG. 2, the valve casing 2
The valve main body 29 is inserted into the circular concave portion 52 communicating with the hollow portion 44 of 6 through the annular stopper plate 11,
The valve casing 26 is caulked and fixed by the tip portion 26a. The needle valve 27 is reciprocally inserted into the guide hole 29a of the valve body 29.

As shown in FIGS. 1, 2, and 3, the stopper plate 11 has an oval shape having an outer diameter smaller than the inner diameter of the recess 52 of the valve casing 26 and an inner diameter smaller than the outer diameter of the flange portion 60. It has a notch hole 11c. The thickness of the step surface 11b of the stopper plate 11 is adjusted so as to maintain the air gap between the fixed iron core 21 and the movable iron core 25 at a predetermined value.

As shown in FIG. 1, the stopper plate 11
The contact surface 11a of the valve contact the end surface 29b of the valve body 29, and the needle valve shoulder 13 can contact the step surface 11b at the center side of the contact surface 11a. The needle valve shoulder portion 13 of the needle valve 27 is connected to the step surface 1 of the stopper plate 11.
When abutting on 1b, the flow rate of the fuel injected from the injection hole 8 is adjusted by the size of the gap between the abutting portion 6 of the needle valve 27 and the valve seat 7. The fuel injection amount increases as the needle valve 27 increases the lift amount from the valve seat 7. Therefore, the lift amount of the needle valve 27, that is, the injection amount is adjusted by the size of the distance L between the contact surface 11a of the stopper plate 11 and the step surface 11b.

When the valve is opened, the needle valve 27 has the flange 6
0 moves in the valve opening direction to a position where 0 abuts on the stopper plate 11. At this time, the fuel in the hollow portion 44 passes through the stopper plate 11 and the guide hole 29a and is injected from the injection hole 8. When the valve is closed, the contact portion 6 of the needle valve 27 has the valve seat 7
Abut. Therefore, the fuel passage that connects the guide hole 29a and the injection hole 8 is blocked, and the fuel injection is stopped.

Next, the shape of the stopper plate 11 will be described in detail with reference to FIGS. 3 and 4. The stopper plate 11 shown in FIG. 1 has a step surface 11 with respect to the contact surface 11a.
b was convex outward. Stopper plate 11
Has a disk shape as a basic shape, and a notched hole 11c in the shape of an elliptical hole is formed in a part thereof in the radial direction. Regarding the size of the step amount L between the contact surface 11a of the stopper plate 11 and the step surface 11b, an error of, for example, ± 4 μm can be generated in terms of processing accuracy.

That is, as for the product processing accuracy of the stopper plate 11, as shown in, for example, FIGS. 5 and 6, an error of ± 4 μm occurs from the predetermined target value of the step difference L. The relationship between the number of stopper plates as products and each error from the target value of the step amount L has a substantially normal distribution as shown in FIG. The stopper plates having respective errors with respect to the step amount L from the target value are ranked based on the difference in the step length L of nine kinds of groups, for example, n1 to n9, and the stoppers having the rank corresponding to the flow rate target value at the time of metering. Select the plate and assemble.

For example, as shown in FIG. 1, the needle valve 27 is inserted into the guide hole 29a of the valve body 29, and then the stopper plate 11 is attached. In this state, the needle valve 27 is opened and the static injection amount is measured. . This adjustment process will be described in detail with reference to FIG. First, the valve body 29 and the needle valve 27 are combined and, for example, a flat stopper plate is attached.
Then, the lift amount or flow rate is measured. It is estimated how much the measured amount reduces the lift amount to achieve a desired static flow rate, and a stopper plate suitable for the estimated flow rate is selected to perform static flow rate measurement. This operation is repeated until the measured flow rate value matches the target static flow rate. At this time, a desired stopper plate is selected from the group of n1 to n9 ranked until it matches the target static flow rate, and the static flow rate is successively measured. The static flow rate adjustment is completed when the target static flow rate value is reached.

Next, the process of assembling the fuel injection valve will be described. First, the static injection amount adjustment of the valve main body 29, the needle valve 27, the stopper plate 11, the movable iron core 25, etc. shown in FIG. The assembled nozzle assembly 90 is assembled, and the valve body 29 is caulked and fixed at the tip portion 26a of the valve casing 26 as shown in FIG. Next, the compression coil spring 28, the adjusting pipe 43 and the like are inserted from the through hole 21a of the connector pipe 23, and finally the filter 24 and the like are housed and assembled.

Next, the dynamic injection amount of the injection valve shown in FIG. 2 is adjusted. For adjusting the dynamic injection amount, the biasing force of the compression coil spring 28 is adjusted by the insertion amount of the adjusting pipe 43, and the opening time of the needle valve 27 is set by adjusting the spring biasing force. The fuel injection amount is adjusted according to the time. When the dynamic injection amount is adjusted in this way, the injection amount setting of the fuel injection amount is completed.

According to this embodiment, the stopper plate 11
By appropriately selecting the size L of the step between the contact surface 11a and the step surface 11b, there is an effect that the static injection amount can be easily adjusted without using other additional parts. Further, according to this embodiment, the size of the step amount L of the stopper plate is divided into ranks in advance according to the size of each step amount, and the stopper plate having the appropriate step amount is selected at the time of assembly, Measure the flow rate, and adjust to obtain the target static flow rate value by repeating this. Therefore, the static flow rate can be quickly adjusted by selecting the stopper plate.

(Second Embodiment) FIG. 8 shows an example of another shape of the stopper plate used in the second embodiment of the present invention. In the second embodiment, the valve body 29 of the stopper plate 15 is
This is an example in which the step surface 15b is formed in a concave shape, that is, a concave shape with respect to the contact surface 15a with the end surface of the. This concave step surface 15
The size of b and the distance L between the contact surface 15a is ranked, and each desired rank is grouped and collected to obtain a desired stopper plate 15 so that an appropriate lift amount is obtained when the static flow rate is adjusted. Selected, which provides static flow rate adjustment. The static flow rate adjustment can be performed by the stopper plate 15 having such a concave step surface 15b.

(Third Embodiment) FIG. 9 shows a third embodiment of the present invention.
Shown in In the third embodiment shown in FIG. 9, the shape of the fuel injection valve is abolished from the O-ring on the outer peripheral portion of the connector as compared with that shown in FIG. 2, and the cylinder shape from the valve body to the valve casing is changed to a cylindrical shape. It is an example.

The structure of the fuel injection valve of the third embodiment is as follows. As shown in FIG. 9, a fixed iron core 121, a spool 191, and an electromagnetic coil 1 are provided inside a resin valve casing 111 of a fuel injection valve 110 as a fluid injection nozzle.
32, the coil mold 131, and the metal plates 193 and 194 as magnetic paths are integrally housed.

The fixed iron core 121 is made of a ferromagnetic material and is provided inside the valve casing 111 so as to project from above the coil mold 131. A guide tube 129 is fixed to the inner wall of the fixed iron core 121. The electromagnetic coil 132 is wound around the outer circumference of the resin spool 191 and then the coil mold 131 is resin-molded around the outer circumference of the spool 191 and the electromagnetic coil 132, and the electromagnetic coil 132 is surrounded by the coil mold 131. The coil mold 131 protects the cylindrical tubular portion 131 a that protects the electromagnetic coil 132 and the lead wire that is electrically derived from the electromagnetic coil 132, and also the terminal 13 described later.
In order to hold No. 4, it is composed of a protruding portion 131b protruding upward from the cylindrical portion 131a. And the coil mold 1
The spool 191 and the electromagnetic coil 132 are mounted on the outer periphery of the fixed iron core 121 in a state of being integrated by 31.

The two metal plates 193 and 194 are provided so that one end on the upper side is in contact with the outer circumference of the fixed iron core 121 and the other end on the lower side is in contact with the outer circumference of the magnetic pipe 123, and the magnetic flux when the electromagnetic coil 132 is energized. It is a member that forms a magnetic path that passes through, and is covered on the outer periphery of the tubular portion 131a so as to sandwich the tubular portion 131a from both sides. The electromagnetic coil 132 is protected by the two metal plates 193 and 194.

A connector portion 111a is provided above the valve casing 111 so as to project from the outer wall of the valve casing 111.
Is provided. Then, the terminal 134 electrically connected to the electromagnetic coil 132 is embedded in the connector portion 111 a and the coil mold 131. The terminal 134 is connected to an electronic control unit (not shown) via a wire harness.

One end of the compression coil spring 128 is in contact with the upper end surface of the needle 125 fixed to the movable iron core 122 by welding, and the other end of the compression coil spring 128 is in contact with the bottom portion of the guide tube 129. The compression coil spring 128 urges the movable iron core 122 and the needle 125 downward in FIG. 9, so that the contact portion 142 of the needle valve 125 is seated on the valve seat 126b of the needle body 126. When an exciting current flows from the terminal 134 through the lead wire to the electromagnetic coil 132 by an electronic control unit (not shown), the needle valve 125 and the movable iron core 122 are attracted toward the fixed iron core 121 against the biasing force of the compression coil spring 128. To be done.

The non-magnetic pipe 124 is connected to the lower portion of the fixed iron core 121, and has a large diameter portion 124a and a small diameter portion 124b.
Is formed into a stepped pipe shape. A large diameter portion 124a is connected to the lower portion of the fixed iron core 121 so as to partially project from the lower end of the fixed iron core 121. Further, at the lower end of the small diameter portion 124b of the non-magnetic pipe 124,
A small diameter portion 123b of a magnetic pipe 123 made of a magnetic material and formed in a stepped pipe shape is connected. The inner diameter of the small-diameter portion 124b of the non-magnetic pipe 124 is set to be slightly smaller than the inner diameter of the small-diameter portion 123b of the magnetic pipe 123, and serves as a guide for the movable iron core 122.

Next, in the inner space of the non-magnetic pipe 124 and the magnetic pipe 123, a movable iron core 122 made of a magnetic material and formed into a cylindrical shape is provided. The outer diameter of the movable iron core 122 is set to be slightly smaller than the inner diameter of the small diameter portion 124b of the nonmagnetic pipe 124, and the movable iron core 122 is slidably supported by the nonmagnetic pipe 124. Further, the upper end surface of the movable iron core 122 is provided so as to face the lower end surface of the fixed iron core 121 with a predetermined gap.

A collar-shaped joint 143 is formed on the needle valve 125. Then, the joint 143 and the movable core 122 are laser-welded, and the needle valve 125 and the movable core 122 are integrally connected. A plurality of grooves as fuel passages are formed on the outer periphery of the joint 143. A filter 133 is provided above the fixed iron core 121 to remove foreign matters such as dust in the fuel that is pressure-fed from the fuel tank by a fuel pump or the like and flows into the fuel injection valve 110.

The fuel that has flowed into the fixed iron core 121 through the filter 133 flows from the guide pipe 129 to the needle valve 125.
Of the needle body 126 and the cylindrical surface 126 a of the needle body 126.
5 passes through the gap between the groove formed in the guide portion 41 and the seat portion 142 at the tip of the needle valve 125 and the valve seat 126b.
And the injection hole 126c.

Next, the structure of the discharge portion 150 of the fuel injection valve 110 will be described with reference to FIG. Magnetic pipe 12
A needle body 126 is inserted into the large diameter portion 123a of No. 3 through the stopper plate 11 having a hollow disk shape and laser-welded. The thickness of the stopper plate 11 is adjusted so as to maintain the air gap between the fixed iron core 121 and the movable iron core 122 at a predetermined value. The guide part 1 of the needle valve 125 is provided on the inner wall of the needle body 126.
A cylindrical surface 126a on which 41 slides and a valve seat 126b on which the conical seat portion 142 of the needle valve 125 is seated are formed. Further, an injection hole 126c is formed in the center of the bottom of the needle body 126.

The needle valve 125 includes a magnetic pipe 123.
The flange 136 is formed so as to face the lower end surface of the stopper plate 11 housed in the inner wall of the large diameter portion 123a with a predetermined gap. This flange 136
Is formed on the side of the seat portion 142 formed at the tip of the needle valve 125 in the entire length of the needle valve 125, and below the flange 136, a guide portion slidable on a cylindrical surface 126a formed on the needle body 126. 141 is formed. A groove is formed by rolling or the like on the outer periphery of the joint portion 143 and the guide portion 141 formed on the needle valve 125.

Regarding the shape of the stopper plate which determines the lift amount of the needle valve, the stopper plate having the same shape as the stopper plate 11 shown in FIGS. 3 and 4 used in the first embodiment is used. Therefore, the lift amount of the needle valve can be increased by arbitrarily selecting a stopper plate having a desired step amount from a group of a plurality of stopper plates in which the step amount of the step portion of the stopper plate is ranked in the fuel injection valve during metering. There is an effect that the static flow rate can be adjusted by appropriately and promptly adjusting.

In this embodiment, since the O-ring inside the valve casing is omitted, the cost can be reduced by eliminating the expensive O-ring. Next, another static flow rate adjustment method will be described. In the embodiment shown in FIG. 7, in order to obtain a desired static injection amount, after mounting a flat stopper plate, the lift amount is measured and a stopper plate having a required step is selected. However, instead of measuring the lift amount, the desired static injection amount may be obtained by directly measuring the flow rate and selecting the stopper plate required to obtain the required flow rate.

[Brief description of drawings]

FIG. 1 is a sectional view showing a nozzle assembly according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an electromagnetic fuel injection valve to which the first embodiment of the present invention is applied.

FIG. 3 is a sectional view of a stopper plate used in the first embodiment.

FIG. 4 is a view on arrow IV in FIG.

FIG. 5 is a diagram showing an example of an error distribution of a step amount L of the stopper plate used in the first embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating step ranks of the stopper plate in the error distribution state shown in FIG.

FIG. 7 is a process diagram for adjusting the static injection amount according to the first embodiment of the present invention.

FIG. 8 is a sectional view of a stopper plate according to a second embodiment of the present invention.

FIG. 9 is a sectional view of an electromagnetic fuel injection valve according to a third embodiment of the present invention.

[Explanation of symbols]

 6 Contact part 7 Valve seat 8 Injection hole 11 Stopper plate 11a Contact surface 11b Step surface 11c Notch hole 13 Needle valve shoulder 21 Stopper plate 27 Needle valve (valve member) 29a Guide hole 29b End face 60 Flange part 90 Nozzle assembly

Claims (3)

[Claims] 1. A valve main body having an injection hole and a valve seat connected to the injection hole, and an abutting portion, the abutting portion abutting the valve seat to supply fuel to an internal combustion engine. A valve member movably provided between a closed position where the valve is stopped and an open position where the contact portion is separated from the valve seat to allow supply of fuel to an internal combustion engine; An elastic member that urges the valve member to the side, an electromagnetic actuator that moves the valve member to the open position against the urging force of the elastic member, a contact surface that contacts the end surface of the valve body, and the valve member An electromagnetic fuel injection valve, comprising: a stopper plate having a step surface that abuts a shoulder portion of the valve member when in the open position. 2. The electromagnetic fuel injection valve according to claim 1, wherein the step surface is formed in a convex shape or a concave shape on the center side of the contact surface. 3. A valve main body having an injection hole, a valve seat continuous with this injection hole, and a guide hole continuous with this valve seat, and an abutting portion, and the abutting portion abuts on the valve seat. Between a closed position where the supply of fuel from the guide hole to the injection hole is stopped and an open position where the contact portion is separated from the valve seat to allow the supply of fuel from the guide hole to the injection hole. A valve member movably provided with, an abutment surface that abuts the end surface of the valve body, and a convex or concave shape on the center side of the abutment surface, and when the valve member is in the open position, A method for adjusting an injection amount of an electromagnetic fuel injection valve, comprising: a stopper plate having a step surface that abuts a shoulder portion of a valve member, the method comprising: inserting the valve member into the guide hole; Assemble the stopper plate and measure the lift amount or flow rate of the valve member. As a result of the measurement, it is determined whether the measured amount is the target lift amount or flow rate, and if the measured amount is not the target lift amount or flow rate, the stopper plate having a desired step amount until the target lift amount or flow rate is reached. A method for adjusting the injection amount of an electromagnetic fuel injection valve, characterized by selecting and assembling.