JP2003269290A - Fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve in which a solenoid drive part mounted on a valve part is airtightly coated and fixed with a resin jacket member for covering the solenoid drive part. <P>SOLUTION: The fuel injection valve comprises: a metallic inner cylinder member 14 for housing a movable body 25 and a valve member 26 and constituting a part of a magnetic circuit for driving the movable body 25; a driving coil C having a coil 31 and a resin bobbin 30; a metallic shell member 23 arranged around the metallic inner cylinder member 14 with the driving coil C in between and abutted at a tip portion against the metallic inner cylinder member 14 so as to form another part of the magnetic circuit; and the resin jacket member 13 for covering an outer periphery of the metallic shell member 23 throughout and coating the metallic inner cylinder member 14. A jacket tip portion of the resin jacket member 13 adheres to a sidewall of an annular step portion 14h formed on an outer periphery of the metallic inner cylinder member 14, and the bobbin 30 of the driving coil C has an extension portion 32 extending axially toward the annular step portion 14h. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fuel injection valve.

[0002]

2. Description of the Related Art As a fuel injection valve used in, for example, an internal combustion engine for automobiles, in order to accurately adjust the fuel injection amount, the valve portion is opened and closed by an electromagnetic drive portion and opened. It is known that the valve period is variably adjusted.

This type of fuel injection valve covers the electromagnetic drive part mounted on the valve part with a resin molding member such as a resin mold as a means for fixing the electromagnetic drive part to the valve part,
The valve portion and the electromagnetic drive portion are adhered and fixed.

[0004]

In the conventional structure, the heat generated by the operation of the fuel injection valve or the like causes a difference in thermal contraction and expansion between the resin molding member and the valve portion which is a metal member. There may be a gap between the members. In some cases, water or the like may enter through this gap, causing a functional deterioration due to internal corrosion of the electromagnetic drive unit.

The present invention has been made in view of the above circumstances, and an object thereof is to hermetically attach the electromagnetic drive unit by a resin jacket member that covers the electromagnetic drive unit mounted on the valve unit. It is to provide a fuel injection valve that can be fixed.

[0006]

According to a first aspect of the present invention, a movable body and a valve member engaged with the movable body are accommodated so as to be reciprocally movable in the axial direction, and the movable body is driven. A metal inner tubular member forming a part of a magnetic circuit, a drive coil having a coil that generates an electromagnetic force by energizing so as to operate the magnetic circuit, and a resin bobbin around which the coil is wound, and a metal A metal outer frame member, which is disposed on the outer periphery of the inner cylinder member with a drive coil interposed therebetween, and whose front end contacts the metal inner cylinder member to form another part of the magnetic circuit, and an outer peripheral surface of the metal outer frame member. A resin outer jacket member that covers the entire circumference and is adhered to the metal inner cylinder member, and a tip of the outer shell of the resin outer jacket member covers the side wall of the annular stepped portion formed on the outer peripheral side of the metal inner cylinder member. The bobbin of the drive coil is attached toward the annular step portion side. Extending portion extending in the direction.

Generally, in a case where different members such as a resin material and a metal material are integrally fixed by insert molding or the like, due to thermal strain caused by the difference in thermal expansion and contraction between the resin material and the metal material, these different members are A gap is likely to occur at the butted portion. That is, a metal inner cylinder member that accommodates the movable body and the valve member in a reciprocating manner, and a metal outer frame member that sandwiches the drive coil on the outer periphery of the metal inner cylinder member are provided on the outer peripheral surface of the metal outer frame member by the resin outer cover member. In a magnetic circuit operated by a drive coil by covering the entire circumference and adhering to the metal inner cylinder member, in a resin outer member and a metal inner cylinder adhered to the metal inner cylinder member due to thermal strain. There is a possibility that a gap will be formed between the member and the water, and the like, if it penetrates into the gap, which may cause a functional deterioration due to corrosion of the drive coil and the like inside.

On the other hand, in the fuel injection valve of the present invention,
The outer jacket tip portion of the resin outer jacket member is attached to the side wall of the annular stepped portion formed on the outer peripheral side of the metal inner tubular member, and
Since the resin bobbin is provided with an extending portion that extends in the axial direction toward the annular step portion side, it extends axially toward the annular step portion side as a contact portion between the bobbin of the electromagnetic coil and the resin jacket member. It is possible to increase the outer peripheral surface integral of the extended portion. In other words, in the attached state in which the outer jacket tip portion of the outer jacket tip portion of the resin jacket member is attached to the side wall of the annular stepped portion formed on the outer peripheral side of the metal inner tubular member,
Since the drive coil on the inner side of the drive coil increases the outer surface area of the drive coil to improve the adhesion with the resin jacket member,
The airtightness of the drive coil, that is, the electromagnetic drive unit can be improved.

Therefore, even if a gap occurs between the tip of the resin jacket member and the side wall of the metal inner cylinder member due to thermal strain, the adhesion of the drive coil inside the resin jacket member to the resin jacket member is improved. This prevents the ingress of water and the like.

A groove is formed on the outer peripheral side of the extending portion as described in claim 2 of the present invention.

As a result, the extended portion of the bobbin, that is, the drive coil can surely improve the surface area of contact with the resin jacket member, which contributes to the adhesion with the resin jacket member, only by the surface integration of the groove.

According to the third aspect of the present invention, the groove portion is an unevenness formed on the outer peripheral surface of the extended portion.

Thus, as a method of increasing the outer peripheral surface area of the extended portion of the resin bobbin, it is only necessary to provide the outer peripheral surface of the extended portion with irregularities, so that the production cost of the bobbin due to the irregularities increases. Can be suppressed.

According to a fourth aspect of the present invention, the bobbin has a tubular portion around which the coil is wound, and flange portions formed at both ends of the tubular portion, and the extending portion includes: It is composed of a plurality of substantially cubes, and the cubes are annularly arranged on the flange portion.

Thus, for example, when secondary molding is performed on a resin-molded bobbin that has been primary-molded by the resin sheath member, the end of the resin flow path of the resin sheath member as the secondary molding resin is
Since it is possible to flow along between the annularly arranged cubes, it is possible to improve the adhesion between the extending portion and the resin jacket member.

According to the fifth aspect of the present invention, the extending portions are extended axially at both ends of the bobbin.

As a result, the assembling property of the bobbin, that is, the drive coil can be improved, and the airtightness can be improved with respect to both axial ends of the resin outer jacket member attached to the metal inner tubular member in the axial direction.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the fuel injection valve of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a schematic configuration of a fuel injection valve according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a main part according to the present embodiment in FIG. 1, in which the resin jacket member covers the entire circumference of the metal outer frame member and is attached to the metal inner cylinder member. FIG. 6 is a schematic cross-sectional view showing a state in which the drive coil is coupled to the metal outer frame member and the metal inner cylinder member, and the drive coil is sandwiched between the metal outer frame member and the metal inner cylinder member.

As shown in FIG. 1, the fuel injection valve 1 of the present embodiment is used in an internal combustion engine, particularly a gasoline engine,
Fuel is injected into an internal combustion engine. This fuel injection valve 1
Is a substantially cylindrical shape, and has a valve body 29 as a valve portion B,
And a valve member (hereinafter referred to as a nozzle needle) 26,
A coil 31 wound around a spool 30 as an electromagnetic drive unit S, a metal inner cylinder member 14 forming a magnetic circuit in which a magnetic flux due to an electromagnetic force generated by energizing the coil 31 flows, a metal outer frame member 23, and suction by this magnetic flux. A movable body (hereinafter referred to as an armature) 25 that is movable in the axial direction on the nozzle needle 26 side by force, and the armature so that the nozzle needle 26 abuts the valve body 29 and closes when the coil 31 is not energized. And a compression spring 24 for urging 25 toward the valve body.

First, the valve body 29 as the valve portion B, the nozzle needle 26 and the like will be described below.

The valve body 29 is fixed to the inner wall of the metal inner cylinder member 14 by laser welding. Specifically, as shown in FIG. 1, the valve body 29 can be press-fitted or inserted into the magnetic cylindrical portion 14c of the metal inner cylindrical member 14. The valve body 29 inserted in the inner wall of the magnetic cylinder member 14c is
By welding the entire circumference from the outer peripheral side of the magnetic cylindrical portion 14c along this outer peripheral portion, the heat welded portion 100 for welding the valve body 29 and the metal inner cylindrical member 14 is formed in an annular shape as shown in FIG.
In addition, a valve seat 29a is formed on the inner peripheral side of the valve body 29 so that the nozzle needle 26 abuts and separates from the valve seat 29a.

That is, the valve body 29 has a bottom wall portion 29 having a valve seat 29a with which the nozzle needle 26 abuts and separates.
b and the metal inner tubular member 1 that is erected from the peripheral edge of the bottom wall portion 29b.
4 and the side wall portion 29h forming the heat-welded portion 100 between them.

As shown in FIG. 1, a fuel passage for fuel to be injected into the internal combustion engine is formed on the inner peripheral side of the valve body 29, and from the downstream side of the internal combustion engine side toward the upstream side of the fuel,
A conical inclined surface 29a as a valve seat, a cylindrical wall surface 29d slidably supporting the nozzle needle 26, and a conical inclined surface 29e are formed in this order. This conical inclined surface or valve seat 29
a is contracted in the fuel injection direction, and an abutting portion 26c of a nozzle needle 26, which will be described later, abuts and separates from the abutting portion 26a.
c and the valve seat are arranged so that they can be seated. This allows
So-called valve opening and closing as the valve section B for communicating and shutting off the fuel to be injected can be performed. Also, the cylindrical wall surface 29
Reference numeral d denotes a needle support hole for slidably supporting the nozzle needle 26, and a fuel passage between the nozzle support 26 and an outer peripheral cutout 26f of a cylindrical protrusion 26a of the nozzle needle 26, which will be described later. . The conical slope surface 29e has a diameter that increases toward the upstream side of the fuel.

The nozzle needle 26 as a valve member is formed so as to slidably be supported by the valve body 29 (specifically, the cylindrical wall surface 29d) and the fuel downstream side of the cylindrical projection 26a. It is configured to include a bottomed tubular body 26b and a shaft portion 26d that is formed on the fuel upstream side of the cylindrical protruding portion 26a and that engages with the armature 25. The cylindrical protruding portion 26a has a substantially annular shape, and the outer periphery thereof slides on the cylindrical wall surface 29d. On the outer peripheral side of the cylindrical protruding portion 26a, a substantially annular cylindrical protruding portion 2 is provided so that the upstream fuel of the cylindrical protruding portion 26a flows to the valve seat 29a arranged on the downstream side.
An outer peripheral side notch 26f is formed to remove 6a in an arc shape. Further, a valve seat 29 is provided at the tip of the bottomed tubular body 26b.
An abutting portion 26c capable of abutting and separating from a is formed.

The injection hole plate 28 is formed in the shape of a thin plate on the tip side of the fuel injection valve 1, and a plurality of injection holes 28a are formed in the central portion. This injection hole 28a determines the injection direction based on the injection hole axis line and the injection hole arrangement, etc., and the fuel injection amount injected from the injection hole depending on the opening area of the injection hole and the valve opening period of the valve portion B by the electromagnetic drive unit S described later. Can be measured.

Next, the coil 31 as the electromagnetic drive section S,
Metal inner cylinder member 14, metal outer frame member 23, armature 2
5, the compression spring 24 and the like will be described below. It should be noted that the electromagnetic drive unit S may be one that opens and closes the valve unit B of the fuel injection valve 1 by energizing.

As shown in FIG. 1, the coil 31 is wound around the outer periphery of a resin bobbin (hereinafter referred to as a spool) 30, and an end of the coil 31 is electrically connected to the terminal 12. Is provided. The spool 30 is mounted on the outer periphery of the metal inner tubular member 14 described below, and also protrudes from the outer wall of the resin mold 13 as the resin outer jacket member formed on the outer periphery of the metal inner tubular member 14. A connector portion 16 is provided, and the terminal 12 is embedded in the connector portion 16. The coil 31 and the spool 30 form a drive coil C that generates an electromagnetic force when energized.

The inner metal tubular member 14 is a pipe material having a magnetic portion and a non-magnetic portion, and is made of, for example, a composite magnetic material. By heating a part of the inner metal tubular member 14 to make it non-magnetic, the inner metal tubular member 14 shown in FIG. 1 is moved toward the upstream from the lower fuel injection side to the magnetic tubular portion 14c and the non-magnetic tubular portion. 14b and the magnetic cylindrical portion 14a are formed in this order. The inner cylindrical metal member 14 is joined to the magnetic cylindrical portion 14c, the non-magnetic cylindrical portion 14b, and the magnetic cylindrical portion 14a by welding or the like.
May be formed.

An armature accommodating hole 14e is provided in the inner circumference of the metal inner cylinder member 14, and the nonmagnetic cylinder portion 1 is formed.
An armature 25, which will be described later, is housed near the boundary between 4b and the magnetic cylinder portion 14c.

Further, the metal inner cylinder member 1 forming a magnetic circuit in which a magnetic flux generated by an electromagnetic force generated by energizing the coil 31 flows.
A metal outer frame member 2 is provided on the outer periphery of the metal outer frame 4 with the drive coil C interposed therebetween.
3, a resin mold 13 is provided.

More specifically, the metal outer frame member 2 made of a magnetic material.
3 covers the outer circumference of the coil 13 as the drive coil C, and the metal outer frame member 23 is in contact with the outer circumference of the metal inner cylinder member 14, and together with the metal inner cylinder member 14, the coil 3
1 forms another part of the magnetic circuit in which magnetic flux generated by electromagnetic force generated by energizing 1 flows. More specifically, as shown in FIG. 1, the metal outer frame member 23 includes, for example, two metal plates 23a. And a metal plate 23b.
One end of each of a and 23b is a magnetic cylinder portion 14a of the metal inner cylinder member 14.
Is provided so as to contact the outer periphery of the magnetic cylindrical portion 14c and the lower end of the magnetic cylindrical portion 14c contacts the outer periphery of the magnetic cylindrical portion 14c.

Resin mold 13 as a resin jacket member
As shown in FIG. 1, so as to cover the entire circumference of the metal outer frame member 23 and adhere to the metal inner tubular member 14,
It is connected to the outer metal frame member 23 and the inner metal tube member 14.

As a result, the magnetic flux generated by the electromagnetic force generated when the coil 31 is energized causes the magnetic cylindrical portion 14a, the suction portion 22 of the magnetic cylindrical portion 14a, which will be described later, the armature 25, which is described later, the magnetic cylindrical portion 14c, and the metal outer frame member. A magnetic circuit that flows in the order of 23 is configured.

As shown in FIG. 1, the inner metal tubular member 14 is provided with a suction portion 22 capable of restricting the maximum axial movement of the armature 25. The suction portion 22 is magnetized by energization. Armature 25 by the magnetic flux of the circuit
A suction force is generated to move the shaft in the axial direction.

The armature 25 is a cylindrical body made of a ferromagnetic material such as magnetic stainless steel, and has a nozzle needle 2
It is fixed at 6. As a result, when the coil 31 is energized, the magnetic flux generated by the electromagnetic force generated in the coil 31 acts on the armature 25 via the suction portion 22, so that the nozzle needle 26 and the suction portion 2 together with the armature 25.
It is movable in the axial direction on the second side, that is, in the direction away from the valve seat 29a. The internal space 25 of the armature 25
e is configured to communicate with the internal fuel passage formed in the armature housing hole 14e of the metal inner tubular member 14.

The compression spring 24 is sandwiched between the end face of the adjusting pipe 21 arranged on the inner circumference of the suction portion 22 and the spring seat 25c which is a step portion forming the internal space 25e of the armature 25. , When the coil 31 is not energized, the nozzle needle 26 fixed to the armature 25 is brought into contact with the valve body 29 (specifically, the contact portion 26c is brought into contact with the valve seat 29a) to close the armature. 25 is urged to the valve body 29 side with a predetermined urging force. The adjusting pipe 21 is press-fitted and fixed to the inner circumference of the suction member 22, and the biasing force of the compression spring 24 can be adjusted to a predetermined biasing force by the amount of press-fitting of the adjusting pipe 21.

As shown in FIG. 1, the spacer 27 is axially sandwiched between the side wall portion 29h of the body 29 and the inner metal tubular member 14, and the axial thickness of the spacer 27 is equal to that of the metal. The maximum axial movement amount of the armature 25 with respect to the suction portion 22 of the inner cylinder member 14 can be adjusted to be a predetermined amount (in other words, the air gap between the suction portion 22 and the armature 25 can be adjusted to a predetermined amount. ).

A valve body 29 is housed on the fuel injection side of the inner metal cylinder member 14. On the other hand, a filter 11 as shown in FIG. 1 is attached above the inner metal tubular member 14, and this filter 11 removes foreign matters contained in the fuel flowing from the fuel upstream of the fuel injection valve 1. It is possible.

Here, the fuel injection valve 1 having the above-mentioned structure
The operation of will be described below. Electromagnetic drive coil 31
When electricity is applied to the coil 31, an electromagnetic force is generated in the coil 31. At this time, in the metal outer frame member 23, the metal inner cylinder member 14 (specifically, the suction portion 22) and the armature 25 that form the magnetic circuit, a suction force for sucking the armature 25 is generated in the suction portion 22. As a result, the nozzle needle 26 fixed to the armature 25 moves into the valve seat 29 of the valve body 29.
Separate from a. Therefore, the valve body 29 and the nozzle needle 26 are opened, and the fuel flowing from the upstream side of the fuel injection valve 9 is injected into the internal combustion engine through the injection hole 28a.

However, in the structure of the fuel injection valve 1 described above, generally, different members such as a resin material and a metal material are integrally fixed by insert molding or the like, and thermal expansion of the resin material and the metal material is performed. There is a possibility that a gap is likely to be formed in the abutting portion of the different members due to the thermal strain caused by the difference of.

That is, the metal inner cylinder member 14 that accommodates the armature 25 and the nozzle needle 26 so as to be capable of reciprocating.
And a metal outer frame member 23 sandwiching the drive coil C (specifically, the coil 31 and the spool 30) on the outer periphery of the metal inner tubular member 14 on the outer peripheral surface of the metal outer frame member 23 by the resin mold 13 of the resin outer cover member. By covering the entire circumference and adhering to the metal inner tubular member 14, the driving coil C
In the magnetic circuit operated by the above, there is a possibility that a gap may be formed between the resin outer jacket member 13 adhered to the metal inner cylinder member 14 and the metal inner cylinder member 14 due to thermal strain. If water or the like enters the gap, the internal members such as the drive coil C may be corroded, and in some cases, the function of the drive coil C may be deteriorated.

(Main parts of this embodiment and detailed description thereof)
Therefore, in the embodiment of the present invention, by providing the following features, it is possible to suppress the generation of the gap caused by the thermal strain due to the difference in thermal expansion between the resin material and the metal material, and the gap is generated. (EN) Provided is a fuel injection valve 1 capable of preventing intrusion of water or the like that causes deterioration of the function of the drive coil C or the like even in the case of occurrence.

First, as shown in FIGS. 1 and 2, the tip portion of the resin outer jacket member 13 of resin material (hereinafter referred to as the outer jacket tip portion) is formed in an annular shape on the outer circumference of the metal inner tubular member 14. It is attached to the annular step portion 14h.

As a result, the metal inner cylinder member 14 and the resin outer jacket member 13 can be hermetically adhered to each other. Moreover, since the resin outer jacket member 13 is attached to the entire circumference of the side wall of the annular step portion 14h formed in the annular shape, the resin outer jacket member 13 can cover the entire outer circumference of the metal outer member 23.
For example, even if a gap is formed between the metal outer frame member 23 and the resin outer jacket member 13, the airtight leakable portion is provided at one place where the tip portion of the resin outer jacket member 13 and the side wall of the annular stepped portion 14h contact each other. Can be limited.

Next, as shown in FIGS. 1 and 2, the above-mentioned structure, that is, the resin outer jacket member 13 is replaced with the metal outer frame member 2.
3, the metal outer frame member 23 and the metal inner cylinder member 1 are coated so as to cover the entire circumference of the metal inner cylinder member 3 and adhere to the metal inner cylinder member 14.
4, while the drive coil C (specifically, the coil 31 and the spool 30) is sandwiched between the metal outer frame member 23 and the metal inner cylinder member 14,
The spool 30 of the drive coil C disposed inside is provided with an extending portion 32 having a substantially cylindrical shape and extending in the axial direction toward the annular step portion 14h side.

That is, the spool 30 of the drive coil C
With the extension 32 added, the outer peripheral surface area can be increased, that is, the surface area in contact with the resin jacket member 13 can be increased. As a result, the adhesion with the resin mantle member 13 can be improved, and the airtightness of the drive coil C can be improved.

Therefore, even if a gap is created between the tip of the outer jacket of the resin outer jacket member 13 and the side wall of the annular stepped portion 14h of the inner metal tubular member 14 due to thermal strain, the drive coil C in the interior of the inner wall of the annular coil. It is possible to prevent the intrusion of water and the like by improving the adhesion of the resin outer jacket member 13 with the above.

Further, as shown in FIG. 2, the extending portion 32 is provided with a groove portion 32a on the outer peripheral side thereof. As a result, the extended portion 32 of the spool 30, that is, the drive coil C
Can more surely increase the surface area that contributes to the adhesiveness with the resin jacket member 13 by the surface integration of the groove portion 32a.

As a method of manufacturing the fuel injection valve 1 having the extended portion 32, for example, the extended portion 32 may be replaced with the spool 30.
The molding method is not limited to the manufacturing method in which the spool 30 and the extended portion 32 are integrated by adhesion or the like before or after the winding assembling step of molding the coil 31 around the spool 30 as a separate member. When molding the spool 30 of the resin, the extended portion 3
2 may be integrally molded with the spool 30 by resin molding. It is possible to suppress an increase in manufacturing cost due to the addition of the extending portion 32 when the extending portion 32 is integrally resin-molded with the spool 30.

Furthermore, the groove 32a is formed by the extension 3
It may be configured to have unevenness formed on the outer peripheral surface of 2. Thus, as a method of increasing the outer peripheral surface area of the extended portion 32 of the resin spool 30, it is only necessary to provide the outer peripheral surface of the extended portion 32 with unevenness. Therefore, the manufacturing cost of the spool 30 due to the unevenness, that is, It is possible to suppress an increase in manufacturing cost of the fuel injection valve.

Furthermore, since the extending portion is provided so as to extend in the axial direction with respect to the substantially cylindrical fuel injection valve shown in FIG. 1, it is easy to dispose the extending portion in contact with the resin jacket member 13.

(Modification) As a modification, as shown in FIG. 3, in addition to the extending portion 32 (see FIG. 2) extending in the axial direction toward the annular step portion 14h side described in the above embodiment. Thus, the extended portions 32 may be provided on the other ends of the spool 30. FIG. 3 is a cross-sectional view showing a main part of a fuel injection valve of a modified example, and in addition to the extended part shown in FIG.
It is a typical sectional view showing the circumference of an extended part provided in the other of both ends of a bobbin.

As a result, the assemblability of the spool 30, that is, the drive coil C can be improved, and the inner metal tube member 14 can be assembled.
The airtightness can be improved with respect to both axial ends of the resin jacket member 13 attached to the outer jacket.

As another modified example, the structure of the extended portion 32 may be annularly arranged on the spool, instead of the substantially cylindrical shape described in the above embodiment.

Specifically, the spool 30 has a tubular portion 30j around which the coil 31 is wound on the outer peripheral side, and flange portions 30f formed at both ends of the tubular portion 30j (see FIGS. 1 and 2). ). Furthermore, in another modification, the extension 32
Is composed of a plurality of substantially cubes (not shown), and the cubes are annularly arranged on the flange portion 30f.

Thus, for example, when the resin outer jacket member 13 is secondarily molded on the primary molded resin spool 30, the end of the resin flow path of the resin outer jacket member 13 as the secondary molding resin is Since the resin material used as the secondary molding resin can flow along the annularly arranged cubes within a meltable range, the extension portion 32 in the middle of the resin flow path and the resin outer cover member 13 are in close contact with each other. It is possible to improve the property.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a fuel injection valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part according to the present embodiment in FIG. 1, in which a resin jacket member covers the entire circumference of a metal outer frame member and is attached to a metal inner cylinder member. FIG. 6 is a schematic cross-sectional view showing a state in which the drive coil is coupled to the metal outer frame member and the metal inner cylinder member, and the drive coil is sandwiched between the metal outer frame member and the metal inner cylinder member.

FIG. 3 is a cross-sectional view showing a main part of a fuel injection valve of a modified example, and is a schematic cross-sectional view showing around an extended portion provided on the other end of the bobbin in addition to the extended portion shown in FIG. Is.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Fuel injection valve 11 Filter 14 Metal inner cylinder member 14a, 14b, 14c Magnetic cylinder part, non-magnetic cylinder part, magnetic cylinder part 14h Annular step part 22 Suction part 23 of metal inner cylinder member 14 Metal outer frame member 24 Compression spring 25 Armature (Movable Body) 26 Nozzle Needle (Valve Member) 26c Abutting Part 27 Spacer 28 Nozzle Plate 28a Nozzle 29 Valve Body 29a Valve Seat 31 Coil 30 Spool 30j Tube 30f Flange 32 Extension 32a Groove B Valve Part S Electromagnetic drive part C Drive coil consisting of coil 31 and spool 30

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Claims (5)

[Claims] 1. A metal inner cylinder which houses a movable body and a valve member engaged with the movable body so as to be capable of reciprocating in the axial direction and constitutes a part of a magnetic circuit for driving the movable body. A drive coil having a member, a coil for generating an electromagnetic force by energizing so as to operate the magnetic circuit, and a resin bobbin around which the coil is wound, and the drive coil on the outer periphery of the metal inner tubular member. A metal outer frame member having a tip end abutting against the metal inner cylinder member so as to form another part of the magnetic circuit, and a metal outer frame member covering the entire outer peripheral surface of the metal outer frame member. And a resin jacket member to be attached to the metal inner cylinder member, wherein the outer jacket tip of the resin jacket member is attached to the side wall of the annular stepped portion formed on the outer peripheral side of the metal inner cylinder member. And the bobbin of the drive coil is
A fuel injection valve, comprising: an extending portion that extends in the axial direction toward the annular step portion side. 2. The fuel injection valve according to claim 1, wherein a groove is formed on the outer peripheral side of the extended portion. 3. The fuel injection valve according to claim 2, wherein the groove portion is an unevenness formed on an outer peripheral surface of the extending portion. 4. The bobbin has a tubular portion around which the coil is wound on the outer peripheral side, and flange portions formed at both ends of the tubular portion. The fuel injection valve according to any one of claims 1 to 3, wherein the fuel injection valve is formed of a cube, and the cube is annularly arranged on the flange portion. 5. The fuel injection valve according to claim 1, wherein the extending portion is extended in both ends of the bobbin in the axial direction.