JP2011169243A - Fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve for an internal combustion engine, having high durability. <P>SOLUTION: The fuel injection valve 10 includes: a cylindrical inlet member 13 having an inlet fitting portion 130 on an opposite side from fuel piping 2 in an axial direction, in which pressing axial force N acts toward a support face portion 1d side by the pressure of supplied fuel from the fuel piping 2 and the supplied fuel flows to an inner peripheral side in a radial direction; and a cylindrical reception member 12 having a reception fitting portion 120, which is welded to the inlet fitting portion 130 coaxially fitted from a fuel piping 2 side, supported in the axial direction by a support face portion 1d and containing a valve member 40 on the inner peripheral side in the radial direction. The end face 122 of the reception fitting portion 120 axially contacts with a projection 132 projecting in the radial direction more than the inlet fitting portion 130. The reception fitting portion 120 and the inlet fitting portion 130 are welded in the radial direction at a part axially separated from a contact interface 70 between the end face 122 and the projection 132. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel injection valve for an internal combustion engine.

  2. Description of the Related Art Conventionally, a fuel injection valve in which fuel injection from an injection hole to an internal combustion engine is intermittently performed by reciprocating movement of a valve member in a state of being pressed against a support surface portion of the internal combustion engine by the pressure of fuel supplied from a fuel pipe has been widely used. Yes. For example, in the fuel injection valve disclosed in Patent Literature 1, a cylindrical inlet member into which fuel supplied from a fuel pipe flows into the radially inner peripheral side and the support surface portion support the valve member in the axial direction and the valve member on the radially inner peripheral side. A cylindrical housing member housed in the housing is coaxially fitted and welded.

  In the fuel injection valve of Patent Document 1, the axial end of the inlet member opposite to the fuel pipe is welded in the radial direction to the axial end of the housing member on the fuel pipe side. Yes. For this reason, the inlet member on which the pressing axial force (hereinafter also simply referred to as “pressing axial force”) acts on the support surface side due to the pressure of the fuel supplied from the fuel pipe is only supported in the radial direction by the housing member. However, there is a concern about the generation of shear stress that causes fatigue failure at the weld interface where these members are welded in the radial direction.

  On the other hand, the fuel injection valve of patent document 2 is provided with the structure which made the end surface part of the inlet member contact the axial direction with respect to the protrusion part made to protrude from the accommodating member to radial direction. When such a structure of Patent Document 2 is applied to the fuel injection valve of Patent Document 1, it is possible to support the inlet member in which the pressing axial force acts in the axial direction by the protruding portion of the housing member that the support surface portion supports in the axial direction. . Therefore, in that case, it is difficult for shear stress to occur at the weld interface formed by welding the inlet member and the housing member in the radial direction.

JP 2009-243466 A JP 2007-218205 A

  However, in the structure of the fuel injection valve of Patent Document 2, as is clear from FIG. 1 of the same document, the end surface portion of the inlet member and the protruding portion of the housing member are welded in the axial direction at the interface between them. . Since the pressing axial force due to the fuel pressure continuously acts through the inlet member on the weld interface formed by welding the inlet member and the housing member in the axial direction in this way, the structure of Patent Document 2 is the fuel injection of Patent Document 1. Even when applied to a valve, fatigue failure may occur at the weld interface, leading to a decrease in durability.

  The present invention has been made in view of the problems described above, and an object thereof is to provide a highly durable fuel injection valve.

  According to the first aspect of the present invention, the fuel injection in which fuel injection from the nozzle hole to the internal combustion engine is intermittently performed by the reciprocating movement of the valve member in a state of being pressed against the support surface portion of the internal combustion engine by the pressure of the fuel supplied from the fuel pipe. The valve has an inlet fitting portion on the opposite side to the fuel pipe in the axial direction, and a pressing axial force acts toward the support surface portion side by the pressure of the fuel supplied from the fuel pipe, and the supplied fuel is It has a cylindrical inlet member that flows into the radially inner peripheral side, and an accommodation fitting part that is welded to the inlet fitting part that fits coaxially from the fuel pipe side, and is supported in the axial direction by the support surface part And a cylindrical housing member that houses the valve member on the radially inner peripheral side, and an end face portion of one of the housing fitting portion and the inlet fitting portion is a housing fitting portion And a protruding portion that protrudes more radially than the other of the inlet fitting portions Contact axially against at locations axially spaced from the contact surface of the end surface portion and the protruding portion, is characterized in that housing engaging portion and the inlet fitting portion is welded in a radial direction.

  Thus, in the cylindrical inlet member into which the fuel supplied from the fuel pipe flows into the radially inner peripheral side, the inlet fitting portion on the side opposite to the axial fuel pipe has the valve member on the radially inner peripheral side. The housing fitting portion of the tubular housing member to be housed is fitted coaxially from the fuel pipe side and welded to the housing fitting portion. Here, since the end surface portion in one of the accommodation fitting portion and the inlet fitting portion is in axial contact with the protruding portion protruding in the radial direction from the other of the fitting portions, the support surface portion of the internal combustion engine is in the axial direction. The projecting portion or the end surface portion of the inlet member can also be supported in the axial direction by the end surface portion or the projecting portion of the housing member that is supported. In addition, a pressing axial force due to fuel pressure is applied to the weld interface where both fitting portions are welded in a radial direction at a position spaced axially from the contact interface between the end face portion and the protruding portion that enables axial support. The action through the inlet member and the generation of shear stress due to the axial force can be suppressed. Therefore, it is possible to avoid a situation in which the weld interface between the two fitting portions is fatigued and to obtain high durability.

  Now, when the accommodation fitting part is inclined relative to the coaxial inlet fitting part, the welding interface is formed by welding the fitting parts in the radial direction by the action of the pressing axial force due to the fuel pressure. There is a concern that shear stress may occur and cause fatigue failure.

  Therefore, according to the second aspect of the present invention, the fitting portion on the radially inner peripheral side of the housing fitting portion and the inlet fitting portion is press-fitted into the fitting portion on the radially outer peripheral side. According to such press-fitting, it is possible to suppress the accommodation fitting portion from being inclined relative to the coaxial inlet fitting portion due to the action or vibration of the pressing axial force. Therefore, at the weld interface formed by welding both fitting portions in the radial direction, fatigue failure due to the generation of shear stress can be avoided and high durability can be maintained.

  According to the invention described in claim 3, one of the accommodating fitting portion and the inlet fitting portion that contacts the protruding portion at the end surface portion exposes the protruding portion on the radially inner peripheral side of the end surface portion. A void is formed. According to this, since one end surface portion of the accommodation fitting portion and the inlet fitting portion is in axial contact with the protruding portion exposed by the gap portion on the radially inner peripheral side, the formation portion of the contact interface is In the fuel injection valve, the fuel injection valve is positioned as far as possible on the radially outer side. Therefore, even if the accommodation fitting portion is inclined relative to the coaxial inlet fitting portion due to the surface roughness of the end surface portion and the protruding portion forming the contact interface, the inclination angle is kept small. Can do. Therefore, at the weld interface formed by welding both fitting portions in the radial direction, fatigue failure due to the generation of shear stress can be avoided and high durability can be maintained.

  Furthermore, according to the invention described in claim 4, the end surface portion of one of the housing fitting portion and the inlet fitting portion projects more radially outward than the other of the housing fitting portion and the inlet fitting portion. Axial contact with the protruding part. According to this, since one end surface portion of the accommodation fitting portion and the inlet fitting portion is in axial contact with the protruding portion that protrudes more radially outward than the other of the fitting portions, the contact interface is formed. A location will be located in the radial direction outer periphery side as much as possible in a fuel injection valve. Therefore, even if the accommodation fitting portion is inclined relative to the coaxial inlet fitting portion due to the surface roughness of the end surface portion and the protruding portion forming the contact interface, the inclination angle is kept small. Can do. Therefore, at the weld interface formed by welding both fitting portions in the radial direction, fatigue failure due to the generation of shear stress can be avoided and high durability can be maintained.

  The invention according to claim 5 further includes a resin member that covers the contact interface between the end face portion and the protruding portion from the outer peripheral side in the radial direction, and the protruding portion is a recess that is recessed from the outer peripheral surface portion of the protruding portion toward the inner peripheral side in the radial direction. A labyrinth structure including a resin member is formed together with the resin member. According to this, the resin member that covers the contact interface between one end surface portion and the other protrusion portion of the accommodation fitting portion and the inlet fitting portion from the radially outer peripheral side is radially inward from the outer peripheral surface portion of the protrusion portion. The labyrinth structure is formed together with the protruding portion by entering the concave portion recessed toward the circumferential side. Here, as described above, the contact interface formed by the axial contact of the end surface portion with the protruding portion protruding to the radially outer peripheral side is formed by the resin member that covers the protruding portion from the radially outer peripheral side. The labyrinth structure is interposed between the resin member and the surrounding space. At the same time, both fitting parts are fitted on the radially inner peripheral side with respect to the contact interface between the projecting part and the end face part by the above-described configuration in which the end face part is in axial contact with the projecting part projecting radially outward. And is welded. Even if water intrudes into the labyrinth structure from the surrounding space of the resin member by the above form, the water is, of course, in the contact interface between the end surface portion and the protruding portion on the downstream side of the labyrinth structure than the contact interface. Intrusion can be suppressed up to the weld interface where both fitting portions are welded on the inner peripheral side. Therefore, it is possible to avoid the situation where the weld interface corrodes due to water immersion and to improve the durability.

  In addition, about the end surface part in one among an accommodation fitting part and an inlet fitting part, like the invention of Claim 6, it is to radial inner peripheral side rather than the other among an accommodation fitting part and an inlet fitting part. You may form so that it may contact an axial direction with respect to the protrusion part which protrudes.

  According to the seventh aspect of the present invention, the end surface portion of the accommodation fitting portion is in axial contact with the protruding portion that protrudes more radially than the inlet fitting portion in the inlet member. According to this, the protruding portion of the inlet member that protrudes in the radial direction from the inlet fitting portion is also supported in the axial direction by the end surface portion of the receiving fitting portion of the receiving member that the supporting surface portion of the internal combustion engine supports in the axial direction. Can do. Therefore, at the welding interface where both fitting parts are welded in the radial direction, the generation of shear stress due to the pressing axial force due to fuel pressure is suppressed, so fatigue damage at the welding interface is avoided and durability is reduced. Can be increased. Further, since the protruding portion that protrudes in the radial direction and contacts the end surface portion in the axial direction is formed in the inlet member, the protruding member is accommodated for the accommodating member that accommodates the valve member on the radially inner peripheral side. The distortion caused by the formation of the part can be avoided. Therefore, it is possible to obtain a desired drive performance of the valve member on the inner peripheral side of the housing member.

  The invention according to claim 8 further includes an electromagnetic coil for generating a magnetic force for driving the valve member by energization, and the housing member forms a magnetic circuit for generating the magnetic force in response to the energization to the electromagnetic coil. . As described above, with respect to the housing member that forms the magnetic circuit for generating the driving magnetic force of the valve member in response to the energization of the electromagnetic coil, the protruding portion where the end surface portion of the housing fitting portion contacts in the axial direction is not formed. Therefore, it is possible to avoid changes in the characteristics of the magnetic circuit due to the formation of the protrusions. Therefore, it is possible to obtain a desired drivability of the valve member on the inner peripheral side of the storage member that forms the magnetic circuit in the storage state of the valve member.

  According to the ninth aspect of the present invention, the end surface portion of the inlet fitting portion is in axial contact with the protruding portion that protrudes in the radial direction from the receiving fitting portion in the receiving member. According to this, the end surface portion of the inlet member can also be supported in the axial direction by the projecting portion that projects in the radial direction from the housing fitting portion in the housing member that the support surface portion of the internal combustion engine supports in the axial direction. Therefore, at the welding interface where both fitting parts are welded in the radial direction, the generation of shear stress due to the pressing axial force due to fuel pressure is suppressed, so fatigue damage at the welding interface is avoided and durability is reduced. Can be increased.

It is sectional drawing which shows the fuel injection valve by 1st embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 1st embodiment of this invention. It is a schematic diagram for demonstrating the characteristic of the fuel injection valve by 1st embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 2nd embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 3rd embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 4th embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 5th embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 6th embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 7th embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 8th embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve by 9th embodiment of this invention.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment.

(First embodiment)
FIG. 1 shows a fuel injection valve 10 according to a first embodiment of the present invention. The fuel injection valve 10 is attached between the internal combustion engine 1 and the fuel pipe 2 and injects fuel supplied from the fuel pipe 2 into the cylinder chamber 1 a of the internal combustion engine 1. In this embodiment, the fuel injection valve 10 injects fuel into the cylinder chamber 1a of the gasoline internal combustion engine 1. For example, the fuel injection valve 10 injects fuel into an intake passage communicating with the cylinder chamber 1a of the gasoline internal combustion engine 1. Or what injects a fuel into the cylinder chamber 1a of the diesel internal combustion engine 1 etc. may be sufficient.

(Constitution)
First, the structure of the fuel injection valve 10 by 1st embodiment is demonstrated based on FIG. The fuel injection valve 10 includes a valve housing 11, a fixed core 20, a movable core 30, a valve member 40, elastic members 50 and 52, and a drive unit 60.

  The valve housing 11 includes an accommodation member 12, an inlet member 13, a nozzle member 14, and the like. The housing member 12 is formed in a cylindrical shape. The first magnetic portion 12a, the nonmagnetic portion 12b, and the second magnetic portion 12c are sequentially arranged in the axial direction from the cylinder head 1b side to the fuel pipe 2 side of the internal combustion engine 1. Have. The magnetic parts 12a and 12c made of a magnetic material and the nonmagnetic part 12b made of a nonmagnetic material are coupled by, for example, laser welding. With such a coupling structure, the nonmagnetic portion 12b prevents the magnetic flux from being short-circuited between the first magnetic portion 12a and the second magnetic portion 12c.

  A cylindrical inlet member 13 is fixed to the axial end of the second magnetic portion 12c opposite to the nonmagnetic portion 12b. The inlet member 13 has a fuel inlet 15 formed on the inner peripheral side in the radial direction so that fuel supplied from the fuel pump (not shown) through the fuel pipe 2 flows in. In this embodiment, a fuel filter 16 is accommodated in the fuel inlet 15 in order to filter the fuel flowing into the fuel inlet 15.

  A nozzle member 14 is fixed to the axial end of the first magnetic portion 12a opposite to the nonmagnetic portion 12b. The nozzle member 14 is formed in a bottomed cylindrical shape, and forms a fuel passage 17 through which fuel is circulated in cooperation with the housing member 12. The nozzle member 14 is inserted into the mounting hole 1c of the cylinder head 1b together with the first magnetic portion 12a of the housing member 12. The nozzle member 14 is provided with a nozzle hole 18 and a valve seat 19. A plurality of nozzle holes 18 communicating with the fuel passage 17 are provided at equal intervals around the central axis of the nozzle member 14 and are each formed in a cylindrical hole shape. The valve seat 19 is formed around the fuel passage 17 on the fuel upstream side of each nozzle hole 18.

  The fixed core 20 is formed in a cylindrical shape by a magnetic material, and is coaxially fixed to the inner peripheral surface portions of the nonmagnetic portion 12 b and the second magnetic portion 12 c of the housing member 12. The fixed core 20 is formed with a through hole 21 penetrating in the axial direction in a cylindrical hole shape in the central portion in the radial direction. The through hole 21 communicates with the fuel inlet 15 of the inlet member 13, and the fuel flowing into the inlet 15 flows into the through hole 21. A first elastic member 50 is accommodated in the radially inner peripheral side of the through hole 21 so as to be elastically deformable, and an adjusting pipe 22 for adjusting a set load of the elastic member 50 is fixed by press-fitting. Yes.

  The movable core 30 is formed of a magnetic material in a cylindrical shape, is coaxially accommodated on the radially inner peripheral side of the accommodating member 12 of the valve housing 11, and has one end surface portion 32 opposed to the fixed core 20. . The movable core 30 is slidably guided on both sides in the axial direction by the nonmagnetic portion 12b of the housing member 12. Thereby, the end surface part 32 of the movable core 30 can contact | abut to the said core 20 by the axial direction movement to the fixed core 20 side.

  The movable core 30 is formed with an axial hole 34 penetrating in the axial direction in the shape of a cylindrical hole in the central portion in the radial direction. In such a movable core 30, the axial hole 34 is open to an end surface portion 32 on the fixed core 20 side and an end surface portion 33 on the opposite side to the fixed core 20.

  The valve member 40 is formed in a needle shape having a circular cross section by a nonmagnetic material. The valve member 40 is coaxially accommodated on the radially inner peripheral side of each of the accommodating member 12 and the nozzle member 14 of the valve housing 11. The valve member 40 has a seat portion 41 that faces the valve seat 19 of the nozzle member 14 at the end in the axial direction on the nozzle member 14 side. The valve member 40 opens each nozzle hole 18 with respect to the fuel passage 17 by moving the seat portion 41 away from the valve seat 19 by moving in the axial direction toward the fixed core 20. On the other hand, the valve member 40 closes each injection hole 18 with respect to the fuel passage 17 by seating the seat portion 41 on the valve seat 19 by moving in the axial direction opposite to the fixed core 20. Thus, the valve member 40 can intermittently inject fuel from the nozzle holes 18 to the cylinder chamber 1a by opening and closing each nozzle hole 18 by reciprocating movement in both axial directions.

  The valve member 40 has a columnar shaft portion 42 extending in the axial direction from the seat portion 41 toward the fixed core 20 side as a main body portion of the member 40. The shaft portion 42 is coaxially inserted into the axial hole 34 of the movable core 30 and is slidable on both sides in the axial direction with respect to the inner peripheral surface portion of the hole 34.

  The valve member 40 has a circular hook-shaped protrusion 44 that protrudes from the shaft portion 42 toward the outer peripheral side in the radial direction at the axial end portion on the fixed core 20 side. The protrusion 44 formed with a smaller diameter than the through hole 21 of the fixed core 20 is inserted into the hole 21 and is in contact with the first elastic member 50. Further, the protrusion 44 formed with a larger diameter than the axial hole 34 of the movable core 30 can come into contact with the end surface portion 32 of the core 30 from the fixed core 20 side.

  The valve member 40 has a fuel hole 46 across the shaft portion 42 and the protrusion 44. The fuel hole 46 is open to a contact surface portion of the protrusion 44 with the first elastic member 50 and an outer peripheral surface portion of the shaft portion 42 exposed from the axial hole 34. The fuel hole 46 communicates between the through hole 21 into which the protrusion 44 is inserted and the fuel passage 17 by such an opening form. Accordingly, the fuel that has flowed from the fuel inlet 15 into the through hole 21 reaches the fuel passage 17 via the fuel hole 46.

  The first elastic member 50 is made of a metal compression coil spring, and is accommodated coaxially on the radially inner peripheral side of the through hole 21 of the fixed core 20. One end of the first elastic member 50 is locked to the adjusting pipe 22, and the other end of the elastic member 50 is locked to the protrusion 44 of the valve member 40. With this locking structure, the first elastic member 50 is compressed between the adjusting pipe 22 and the valve member 40 and elastically deformed, thereby restoring the force that biases the valve member 40 to the side opposite to the fixed core 20. Is generated.

  The second elastic member 52 is made of a metal compression coil spring, and is accommodated coaxially on the radially inner peripheral side of the first magnetic portion 12a of the housing member 12 and on the radially outer peripheral side of the shaft portion 42 of the valve member 40. Has been. One end of the second elastic member 52 is locked to the first magnetic portion 12 a, and the other end of the elastic member 52 is locked to the axial hole 34 of the movable core 30. With such a locking structure, the second elastic member 52 is compressed between the valve housing 11 and the movable core 30 and is elastically deformed, whereby a restoring force that urges the movable core 30 toward the fixed core 20 is provided as the first elasticity. It occurs smaller than the restoring force of the member 50.

  The drive unit 60 includes an electromagnetic coil 61, a resin bobbin 62, a connector 64, a coil housing 66, and the like. The electromagnetic coil 61 is formed by winding a metal wire around a resin bobbin 62. The electromagnetic coil 61 is coaxially disposed on the radially outer peripheral side of the nonmagnetic portion 12b and the second magnetic portion 12c of the housing member 12. The connector 64 has a terminal 64 a that electrically connects an external control circuit (not shown) and the electromagnetic coil 61, and energization of the electromagnetic coil 61 is controlled by the control circuit. .

  The coil housing 66 is formed in a cylindrical shape by a magnetic material, and is disposed on the radially outer peripheral side of the electromagnetic coil 61 and the valve housing 11 to cover the coil 61. The coil housing 66 is supported by the support surface portion 1d in the axial direction by being pressed against the support surface portion 1d having a stepped surface formed so as to expand toward the fuel pipe 2 in the mounting hole 1c of the internal combustion engine 1. ing. Here, the first magnetic portion 12a of the housing member 12 is reduced in diameter toward the nozzle member 14 in the axial direction, which is the support surface portion 1d side, and the step surface where the coil housing 66 engages from the support surface portion 1d side. A reduced diameter portion 124 is formed. Thus, the accommodating member 12 is supported in the axial direction by the support surface portion 1d via the inner peripheral flange portion 66a protruding to the radially inner peripheral side of the coil housing 66. Further, here, the inlet member 13 of the valve housing 11 is subjected to a pressing axial force N directed toward the support surface portion 1d by the pressure of the fuel supplied from the fuel pipe 2. Therefore, the fuel injection valve 10 causes the fuel injection valve 10 to inject fuel from each injection hole 18 under the state in which the housing member 12 is pressed against the support surface portion 1d via the inner peripheral flange portion 66a of the coil housing 66 by the action of the pressing axial force N. It is intermittent.

  Here, when the electromagnetic coil 61 is excited by energization, the coil housing 66, the first magnetic part 12 a of the housing member 12, the movable core 30, the fixed core 20, and the second magnetic part 12 c of the housing member 12 are formed jointly. Magnetic flux flows through the magnetic circuit. As a result, a magnetic attractive force is generated between the movable core 30 and the fixed core 20 facing each other as a “magnetic force” that attracts and drives the movable core 30 toward the fixed core 20. On the other hand, when the electromagnetic coil 61 is demagnetized by stopping energization, the magnetic flux does not flow in the magnetic circuit, so that the magnetic attractive force disappears between the movable core 30 and the fixed core 20.

  In the valve opening operation of the fuel injection valve 10 configured as described above, the magnetic attractive force acts on the movable core 30 as the energization of the electromagnetic coil 61 is started. Due to the action of the magnetic attraction force, the movable core 30 receives the restoring force of the first elastic member 50, and resists the valve member 40 in which the protrusion 44 is in contact with the end surface portion 32 on the fixed core 20 side against the restoring force. Then press. As a result, the movable core 30 moves together with the valve member 40 toward the core 20 until the end face portion 32 collides with the fixed core 20. Fuel is injected from the nozzle hole 18.

  Further, in the valve closing operation of the fuel injection valve 10 after the valve opening operation, the magnetic attractive force acting on the movable core 30 disappears as the energization of the electromagnetic coil 61 is stopped. Due to the disappearance of the magnetic attractive force, the valve member 40 that receives a restoring force larger than that of the second elastic member 52 from the first elastic member 50 brings the projecting portion 44 into contact with the end surface portion 32, and moves the movable core 30 to the fixed core 20. Press to the opposite side. As a result, since the seat portion 41 is seated on the valve seat 19, the movement of the valve member 40 is stopped, and the fuel injection from each nozzle hole 18 is also stopped.

(Characteristic)
Next, features of the fuel injection valve 10 according to the first embodiment will be described in detail. As shown in FIGS. 1 and 2, the inlet member 13 made of a metal material such as stainless steel forms a cylindrical inlet fitting portion 130 on the side opposite to the fuel pipe 2 in the axial direction. Correspondingly, in the housing member 12, the second magnetic portion 12c made of a metal magnetic material such as stainless steel is coaxially fitted with the inlet fitting portion 130 from the fuel pipe 2 side in the axial direction. A cylindrical accommodation fitting portion 120 is formed. Here, in the present embodiment in which the inlet fitting portion 130 is formed to have a smaller diameter than the housing fitting portion 120, the inlet fitting portion 130 is fitted in the press-fitted state on the radially inner peripheral side of the housing fitting portion 120. is doing. The press-fitting allowance of the inlet fitting portion 130 can be appropriately set as long as the relative inclination of the fitting portions 120 and 130 can be suppressed, but is set to 30 μm, for example.

  Thus, in the valve housing 11 formed by fitting the accommodation fitting portion 120 on the radially outer peripheral side and the inlet fitting portion 130 on the radially inner peripheral side, the fitting portions 120 and 130 are in the radial direction. It is welded to maintain a coaxial state. In this embodiment, the fitting portions 120 and 130 are welded by, for example, irradiating laser light such as a YAG laser in the radial direction from the outer peripheral side of the accommodation fitting portion 120, and the accommodation fitting portion 120 and the inlet fitting by the light energy. This can be realized by sequentially melting the joint portion 130 and then performing a cooling and solidifying step.

  Further, in the present embodiment, the inlet member 13 has an annular flat plate shape (circular bowl shape) so as to protrude more radially outward than the axial end portion 131 on the fuel pipe 2 side of the inlet fitting portion 130. A protruding portion 132 is formed. Correspondingly, the axial end portion 121 on the fuel pipe 2 side of the accommodating fitting portion 120 formed by the second magnetic portion 12c of the accommodating member 12 is formed from the support surface portion 1d side with respect to the protruding portion 132. An end surface 122 having an annular plane shape is formed so as to be in contact with the axial direction.

  With the above-described configuration, the accommodating fitting portion 120 and the inlet fitting portion 130 have the above-mentioned diameters at locations separated from the contact interface 70 between the end surface portion 122 and the side surface portion 134 of the protruding portion 132 toward the support surface portion 1d in the axial direction. A welding interface 71 is formed by directional welding. Further, in this embodiment, the protrusion 132 and the contact interface 70 are accommodated and fitted by the resin member 68 that is formed of the same resin material as the connector 64 and interposed between the electromagnetic coil 61 and the coil housing 66. The portion 120 is covered from the outer peripheral side in the radial direction. Accordingly, the welding interface 71 located on the inner peripheral side of both the interface 73 and the contact interface 70 between the resin member 68 and the protrusion 132 is between the peripheral space 72 of the resin member 68 and both the interfaces 73 and 70. Therefore, the water from the space 72 is difficult to reach.

  According to the first embodiment thus far, the end surface portion 122 of the accommodation fitting portion 120 in the accommodation member 12 that the support surface portion 1d supports in the axial direction protrudes more radially than the inlet fitting portion 130 in the inlet member 13. Since the portion 132 is in axial contact, the inlet member 13 can be supported in the axial direction. In addition, in the weld interface 71 in which both the fitting portions 120 and 130 are welded in the radial direction at a position spaced apart from the contact interface 70 between the end surface portion 122 and the projecting portion 132 enabling such axial support. The action of the pressing axial force N and the generation of shear stress due to the axial force can be suppressed. Therefore, fatigue failure of the weld interface 71 can be avoided and high durability can be obtained.

  Further, according to the first embodiment, since the inlet fitting portion 130 is press-fitted on the radially inner peripheral side of the housing fitting portion 120, the fitting portions 120, 130 are operated by the pressing axial force N, vibration, etc. Depending on the situation, it becomes relatively difficult to tilt. At the same time, according to the first embodiment, the end surface portion 122 of the housing fitting portion 120 is in axial contact with the protruding portion 132 that protrudes more radially outward than the inlet fitting portion 130, thereby forming the contact interface 70. The formation location is located on the outer peripheral side in the radial direction as much as possible in the fuel injection valve 10. Therefore, as shown in FIG. 3, even if the fitting portions 120 and 130 are relatively inclined due to the surface roughness of the surface portions 122 and 134 forming the contact interface 70, the inclination from the inclination center to the contact interface 70. As the radius R increases as much as possible, the tilt angle θ decreases. From these things, since the generation of shear stress due to the inclination of the fitting portions 120 and 130 can be suppressed at the welding interface 71 between the fitting portions 120 and 130, it is possible to maintain high durability. .

  Still further, according to the first embodiment, the protruding portion 132 that protrudes in the radial direction and contacts the end surface portion 122 in the axial direction is not the receiving member 12 that receives the valve member 40 and forms a magnetic circuit for driving the valve member 40. The inlet member 13 is formed. According to this, it becomes possible to obtain the desired drivability of the valve member 40 by avoiding the distortion of the housing member 12 and the change in characteristics of the magnetic circuit due to the formation of the protruding portion 132.

(Second embodiment)
As shown in FIG. 4, the second embodiment of the present invention is a modification of the first embodiment. In the second embodiment, a recess 136 that is recessed radially inward from the outer peripheral surface portion 135 is formed in an annular groove shape in the protruding portion 132 that protrudes radially outward in the inlet member 13. And the labyrinth structure 80 is formed when the resin member 68 which covers the outer peripheral surface part 135 of the protrusion part 132 enters this recessed part 136 in the whole region of the circumferential direction. That is, in this embodiment, as the protruding portion 132 supported in the axial direction by the end surface portion 122, the thickened portion that protrudes toward the outer peripheral side in the radial direction is also used for forming the concave portion 136 that forms the labyrinth structure 80. It is.

  According to the second embodiment, the contact interface 70 between the projecting portion 132 and the end surface portion 122 includes the labyrinth structure 80 in which the resin member 68 that covers the contact interface 70 from the outer peripheral side in the radial direction forms the recess 136 of the projecting portion 132. The resin member 68 can be interposed between the surrounding space 72 and the resin member 68. Therefore, even if water enters the labyrinth structure 80 from the surrounding space 72 of the resin member 68, the water is not limited to the contact interface 70 on the downstream side of the labyrinth structure 80, and the radially inner periphery of the interface 70. The penetration can be suppressed up to the welding interface 71 on the side. Therefore, it is possible to avoid the situation where the weld interface 71 is corroded by water so as to improve the durability.

(Third embodiment)
As shown in FIG. 5, the third embodiment of the present invention is a modification of the second embodiment. In the third embodiment, the accommodation fitting portion 120 having the end surface portion 122 in the accommodation member 12 forms a cylindrical gap portion 74 on the radially inner peripheral side of the end surface portion 122. As a result, the gap 74 exposes the side surface 134 of the protruding portion 132 in the entire region in the circumferential direction on the radially inner peripheral side of the contact interface 70 in which the end surface portion 122 is in contact with the protruding portion 132 of the inlet member 13. It is in shape.

  According to the third embodiment as described above, in combination with the contact of the end face 122 with the projecting portion 132 projecting to the radially outer peripheral side, the location where the contact interface 70 is formed is acceptable in the fuel injection valve 10. As a result, it is located on the radially outer peripheral side. Therefore, even if the fitting portions 120 and 130 are relatively inclined due to the surface roughness of the surface portions 122 and 134 forming the contact interface 70, the inclination angle becomes small. Therefore, since the generation of shear stress due to the relative inclination of the fitting portions 120 and 130 can be suppressed at the welding interface 71 between the fitting portions 120 and 130, it is possible to maintain high durability. .

(Fourth embodiment)
As shown in FIG. 6, the fourth embodiment of the present invention is a modification of the second embodiment. In the fourth embodiment, the inlet fitting portion 130 of the inlet member 13 is formed in a cylindrical shape having a larger diameter than the housing fitting portion 120 of the housing member 12, and is formed on the radially inner peripheral side of the inlet fitting portion 130. The accommodation fitting part 120 is fitted in a press-fit state. In the valve housing 11 in which the accommodation fitting portion 120 on the radially inner peripheral side and the inlet fitting portion 130 on the radially outer peripheral side are fitted in this way, the fitting portions 120 and 130 have a diameter. It is welded in the direction to maintain a coaxial state. In addition, about the press fitting allowance of the accommodation fitting part 120, it can set similarly to the case of the press fitting allowance of the inlet fitting part 130 in 1st embodiment. Further, the welding of the fitting portions 120 and 130 can be realized in the same manner as in the first embodiment except that the laser beam is irradiated in the radial direction from the outer peripheral side of the inlet fitting portion 130.

  Further, in the fourth embodiment, the inlet member 13 protrudes toward the radially inner peripheral side that is opposite to the protruding portion 132 from the axial end portion 131 on the fuel pipe 2 side of the inlet fitting portion 130. As described above, a cylindrical protrusion 1132 is formed. The inlet member 13 is also supported in the axial direction by the end surface portion 122 of the housing fitting portion 120 in the housing member 12 supported in the axial direction by the support surface portion 1d with respect to the protruding portion 1132 in the axial direction. ing.

  With the above-described configuration, the accommodating fitting portion 120 and the inlet fitting portion 130 are fitted at locations separated from the contact interface 1070 between the end surface portion 122 and the side surface portion 1134 of the protruding portion 1132 toward the support surface portion 1d in the axial direction. The welding interface 1071 is formed by radial welding of the joint portions 120 and 130. Therefore, at the weld interface 1071 that is axially spaced from the contact interface 1070 between the end face portion 122 and the protruding portion 1132 that enables the axial support described above, the action of the pressing axial force N is also caused by the generation of shear stress due to the axial force. Can also be suppressed. Therefore, also in the fourth embodiment, it is possible to avoid fatigue fracture of the weld interface 1071 and obtain high durability.

  Furthermore, according to the fourth embodiment, since the accommodation fitting portion 120 is press-fitted to the radially inner peripheral side of the inlet fitting portion 130, the fitting portions 130 and 120 are caused by the action of the pressing axial force N, vibration, or the like. Is relatively difficult to tilt. Furthermore, according to the fourth embodiment, the protruding portion 1132 that protrudes in the radial direction and contacts the end surface portion 122 in the axial direction is also similar to the protruding portion 132 in the accommodating member 12 that accommodates the valve member 40 and forms the magnetic circuit. It is not formed in the inlet member 13. Accordingly, the generation of shear stress at the interface 1071 due to the inclination of the fitting portions 130 and 120 is suppressed to maintain high durability, and the distortion of the housing member 12 and the magnetic circuit due to the formation of the protruding portions 1132 and 132 are maintained. It is possible to obtain the desired drivability of the valve member 40 by avoiding this characteristic change.

  In addition, the resin member 68 of 4th embodiment has covered the protrusion part 132 which the recessed part 136 opens in the outer peripheral surface part 135, and the inlet fitting part 130 from the outer peripheral side of radial direction. As a result, in the fourth embodiment, the inner side of the labyrinth structure 80 in which the resin member 68 enters the recess 136, and the inner side of the interface 75 between the longitudinal cylindrical inlet fitting portion 130 and the resin member 68. A welding interface 1071 is located on the circumferential side. Accordingly, since the welding interface 1071 has a shape in which the labyrinth structure 80 and the interface 75 are interposed between the surrounding space 72 of the resin member 68, the path distance that is concerned about water immersion from the space 72 is extended. Thus, durability is improved.

(Fifth embodiment)
As shown in FIG. 7, the fifth embodiment of the present invention is a modification of the fourth embodiment. In the fifth embodiment, the accommodation fitting portion 120 having the end surface portion 122 in the accommodation member 12 forms a gap portion 1074 on the radially inner peripheral side of the end surface portion 122. Thus, the gap portion 1074 exposes the side surface portion 1134 of the protruding portion 1132 in the entire region in the circumferential direction on the radially inner peripheral side of the contact interface 1070 in which the end surface portion 122 contacts the protruding portion 1132 of the inlet member 13. It is in shape.

  According to such a fifth embodiment, the location where the contact interface 1070 is formed can be set as radially as possible in the fuel injection valve 10. Therefore, even if the fitting portions 120 and 130 are relatively inclined due to the surface roughness of the surface portions 122 and 1134 forming the contact interface 1070, the inclination angle can be kept small. Therefore, at the welding interface 1071 between the fitting portions 120 and 130, it is possible to suppress the generation of shear stress due to the relative inclination of the fitting portions 120 and 130, and to maintain high durability. is there.

(Sixth embodiment)
As shown in FIG. 8, the sixth embodiment of the present invention is a modification of the fourth embodiment. In the sixth embodiment, the inlet member 13 is not provided with the protruding portion 1132, and instead, the accommodating member 12 is provided with the protruding portion 128. The protruding portion 128 protrudes in a cylindrical shape toward the outer peripheral side in the radial direction from the axial end portion 127 on the support surface portion 1 d side in the accommodating fitting portion 120 formed by the second magnetic portion 12 c of the accommodating member 12. Correspondingly, the circular end of the inlet fitting portion 130 of the inlet member 13 is in contact with the protruding portion 128 in the axial direction from the fuel pipe 2 side on the support surface portion 1d side. An annular plane end surface portion 138 is formed. That is, the inlet member 13 is also supported in the axial direction by the end surface portion 138 of the inlet fitting portion 130 contacting the protruding portion 128 of the housing member 12 supported in the axial direction by the support surface portion 1d in the axial direction.

  With the above-described configuration, the inlet fitting portion 130 and the housing fitting portion 120 are arranged in a radial direction at locations separated from the contact interface 76 between the end surface portion 138 and the side surface portion 129 of the protruding portion 128 toward the fuel pipe 2 in the axial direction. A welding interface 1071 is formed by welding. Therefore, at the welding interface 1071 that is axially spaced from the contact interface 76 between the end face portion 138 and the protrusion 128 that enables the axial support described above, the action of the pressing axial force N is also caused by the shear caused by the axial force. The generation of stress can also be suppressed. Therefore, also in the fifth embodiment, it is possible to avoid fatigue fracture of the weld interface 1071 and obtain high durability.

  Furthermore, according to the sixth embodiment, the end surface portion 138 of the inlet fitting portion 130 is in axial contact with the protruding portion 128 that protrudes more radially outward than the housing fitting portion 120, thereby forming the contact interface 76 thereof. The location is located on the outer peripheral side in the radial direction as much as possible in the fuel injection valve 10. Therefore, even if the fitting portions 130 and 120 are relatively inclined due to the surface roughness of the surface portions 138 and 129 forming the contact interface 76, the inclination angle becomes small. At the same time, according to the sixth embodiment, since the accommodation fitting portion 120 is press-fitted to the radially inner peripheral side of the inlet fitting portion 130, the fitting portions 130, 120 are subjected to the action and vibration of the pressing axial force N. In some cases, it is relatively difficult to tilt. For these reasons, at the welding interface 1071 between the fitting portions 130 and 120, the generation of shear stress due to the inclination of the fitting portions 130 and 120 can be suppressed, so that high durability can be maintained. It is.

  In addition, the resin member 68 of the sixth embodiment covers the protruding portion 132 and the inlet fitting portion 130 from the outer peripheral side in the radial direction, as in the fourth embodiment, and the contact interface 76 and the protruding portion 128. Also covers from the outer peripheral side in the radial direction. As a result, in the sixth embodiment, the inner circumferential side of the labyrinth structure 80 in which the resin member 68 enters the recess 136, and the interface 75 and the contact interface between the longitudinal cylindrical inlet fitting portion 130 and the resin member 68. A welding interface 1071 is located on the inner peripheral side of both interfaces 76. Therefore, since the welding interface 1071 has a shape in which the labyrinth structure 80 and the interfaces 75 and 76 are interposed between the surrounding space 72 of the resin member 68, there is a path distance that is concerned about water immersion from the space 72. It is extended to improve durability.

(Seventh embodiment)
As shown in FIG. 9, the seventh embodiment of the present invention is a modification of the sixth embodiment. In the housing member 12 of the seventh embodiment, the protrusion 128 that protrudes radially outward is formed with a plurality of annular groove-shaped recesses 126 that are recessed radially inward from the outer peripheral surface portion 125 in the axial direction. And the labyrinth structure 82 is formed when the resin member 68 which covers the outer peripheral surface part 125 of the protrusion part 128 penetrates into these recessed parts 126 in the whole region of the circumferential direction. That is, in the present embodiment, as the protruding portion 128 that supports the end surface portion 138 in the axial direction, a portion that protrudes toward the outer peripheral side in the radial direction and is thickened is also used for forming the concave portion 126 that forms the labyrinth structure 82. It is.

  In such a seventh embodiment, the welding interface 1071 is positioned on the inner peripheral side with respect to the labyrinth structure 82 formed by the resin member 68 that covers the contact interface 76 from the outer peripheral side in the radial direction together with the concave portions 126 of the protrusions 128. It becomes. According to this, it is possible to improve the durability by ensuring the corrosion avoidance action of the weld interface 1071 due to water immersion.

(Eighth embodiment)
As shown in FIG. 10, the eighth embodiment of the present invention is a modification of the sixth embodiment. In the eighth embodiment, the inlet fitting portion 130 having the end surface portion 138 in the inlet member 13 forms a gap portion 78 on the radially inner peripheral side of the end surface portion 138. As a result, the gap portion 78 exposes the side surface portion 129 of the protruding portion 128 in the entire region in the circumferential direction on the radially inner peripheral side of the contact interface 76 in which the end surface portion 138 contacts the protruding portion 128 of the housing member 12. It is in shape.

  According to such an eighth embodiment, the location where the contact interface 76 is formed can be set as radially as possible in the fuel injection valve 10. Therefore, even if the fitting portions 120 and 130 are relatively inclined due to the surface roughness of the surface portions 138 and 129 forming the contact interface 76, the inclination angle can be kept small. Therefore, at the welding interface 1071 between the fitting portions 120 and 130, it is possible to suppress the generation of shear stress due to the relative inclination of the fitting portions 120 and 130, and to maintain high durability. is there.

(Ninth embodiment)
As shown in FIG. 11, the ninth embodiment of the present invention is a modification of the second embodiment. In the ninth embodiment, the inlet member 13 is not provided with the protruding portion 132, and instead, the accommodating member 12 is provided with the protruding portion 1128. The protruding portion 1128 protrudes in a cylindrical shape toward the radially inner peripheral side from the axial end portion 127 on the support surface portion 1 d side in the accommodating fitting portion 120 formed by the second magnetic portion 12 c of the accommodating member 12. . Correspondingly, an annular ring is formed so that the axial end 137 on the support surface 1d side of the inlet fitting portion 130 of the inlet member 13 is in axial contact with the protrusion 128 from the fuel pipe 2 side. A planar end surface portion 1138 is formed. That is, the inlet member 13 is also supported in the axial direction by the end surface portion 1138 of the inlet fitting portion 130 contacting the protruding portion 1128 of the housing member 12 supported in the axial direction by the support surface portion 1d in the axial direction.

  With the above-described configuration, the inlet fitting portion 130 and the housing fitting portion 120 are arranged in a radial direction at locations separated from the contact interface 1076 between the end surface portion 1138 and the side surface portion 1129 of the protruding portion 1128 toward the fuel pipe 2 in the axial direction. A welding interface 71 is formed by welding. Therefore, at the welding interface 71 that is axially spaced from the contact interface 1076 of the end surface portion 1138 and the protrusion 1128 that enables the axial support described above, the action of the pressing axial force N is also caused by the shear stress due to the axial force. Generation | occurrence | production of can also be suppressed. Therefore, also in the ninth embodiment, it is possible to avoid fatigue failure of the weld interface 71 and obtain high durability.

  Furthermore, also according to the ninth embodiment, the inlet fitting portion 130 is press-fitted on the radially inner peripheral side of the housing fitting portion 120, so that the fitting portions 120 and 130 are operated by the pressing axial force N, vibration, and the like. Some of them are relatively hard to tilt. Therefore, since the generation of shear stress due to the inclination of the fitting portions 120 and 130 can be suppressed at the weld interface 71 between the fitting portions 120 and 130, high durability can be maintained.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and can be applied to various embodiments without departing from the scope of the present invention. .

  Specifically, in the first to eighth embodiments, the fitting portions 120 and 130 do not press-fit the radially inner fitting portion into the radially outer fitting portion between the fitting portions. You may change so that a fitting clearance may be formed. In the third to eighth embodiments, the labyrinth structures 80 and 82 formed by inserting the resin member 68 into the concave portion 136 may be changed so as not to be formed. The labyrinth structure 80 may be formed by the concave portion 136 of the projecting portion 132 separated from the end surface portion 122 of the joint portion 120. Furthermore, in the seventh embodiment, the gap portion 78 of the eighth embodiment may be formed in the inlet fitting portion 130. Similarly, in the ninth embodiment, the gap portion 1074 of the fifth embodiment is applied. The space may be formed on the inlet fitting portion 130 side instead of the accommodating fitting portion 120 side.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine, 1d Support surface part, 2 Fuel piping, 10 Fuel injection valve, 11 Valve housing, 12 Housing member, 12a 1st magnetic part, 12b Nonmagnetic part, 12c 2nd magnetic part, 13 Inlet member, 15 Fuel inflow port , 18 nozzle hole, 20 fixed core, 30 movable core, 40 valve member, 50 first elastic member, 52 second elastic member, 60 drive unit, 61 electromagnetic coil, 64 connector, 68 resin member, 70, 76, 1070, 1076 Contact interface, 71, 1071 Weld interface, 72 Ambient space, 74, 78, 1074 Gap, 80, 82 Labyrinth structure, 120 Housing fitting, 121, 127, 131, 137 Axial end, 122, 138, 1138 End surface portion, 124 Reduced diameter portion, 125, 135 Outer peripheral surface portion, 126, 136 Recessed portion, 128, 132, 1128, 113 2 Protruding part, 129, 134, 1129, 1134 Side face part, 130 inlet fitting part, N pressing axial force

Claims (9)

A fuel injection valve for intermittently injecting fuel from an injection hole to the internal combustion engine by reciprocating movement of a valve member under a state of being pressed against a support surface portion of the internal combustion engine by pressure of fuel supplied from a fuel pipe;
An inlet fitting portion is provided on the opposite side of the fuel pipe in the axial direction, and a pressing axial force acts toward the support surface portion side by the pressure of the fuel supplied from the fuel pipe, and the supplied fuel is in the radial direction. A cylindrical inlet member flowing into the inner peripheral side;
A housing fitting portion welded to the inlet fitting portion that is coaxially fitted from the fuel pipe side is supported in the axial direction by the support surface portion, and the valve member is radially inward. A cylindrical housing member to be housed in,
In a fuel injection valve equipped with
An end surface portion of one of the accommodation fitting portion and the inlet fitting portion is in axial contact with a protruding portion that projects more radially than the other of the accommodation fitting portion and the inlet fitting portion. The fuel injection valve is characterized in that the housing fitting portion and the inlet fitting portion are welded in a radial direction at a position spaced apart from the contact interface between the end face portion and the protruding portion in the axial direction.   2. The fuel injection valve according to claim 1, wherein, of the accommodating fitting portion and the inlet fitting portion, a radially inner circumferential fitting portion is press-fitted into a radially outer circumferential fitting portion. .   One of the accommodating fitting portion and the inlet fitting portion that contacts the protruding portion at the end surface portion forms a void portion that exposes the protruding portion on the radially inner peripheral side of the end surface portion. The fuel injection valve according to claim 1 or 2.   The end surface portion in one of the accommodation fitting portion and the inlet fitting portion is a shaft with respect to the protruding portion that projects more radially outward than the other of the accommodation fitting portion and the inlet fitting portion. It contacts in a direction, The fuel injection valve as described in any one of Claims 1-3 characterized by the above-mentioned. Further comprising a resin member that covers the contact interface of the end surface portion and the protruding portion from a radially outer peripheral side;
5. The fuel according to claim 4, wherein the projecting portion forms a labyrinth structure in which the resin member enters a recess recessed from the outer peripheral surface portion of the projecting portion toward the radially inner peripheral side together with the resin member. Injection valve.   The end surface part in one of the accommodation fitting part and the inlet fitting part is opposed to the protruding part projecting radially inward from the other of the accommodation fitting part and the inlet fitting part. It contacts in an axial direction, The fuel injection valve as described in any one of Claims 1-3 characterized by the above-mentioned.   The said end surface part of the said accommodation fitting part contacts the axial direction with respect to the said protrusion part which protrudes in a radial direction rather than the said inlet fitting part in the said inlet member. A fuel injection valve according to claim 1. An electromagnetic coil that generates a magnetic force for driving the valve member by energization;
The fuel injection valve according to claim 7, wherein the housing member forms a magnetic circuit for generating the magnetic force in response to energization of the electromagnetic coil.   The end face portion of the inlet fitting portion is in axial contact with the protruding portion protruding in the radial direction from the receiving fitting portion in the receiving member. The fuel injection valve according to any one of the above.

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