JP2009228526A - Fuel injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection device capable of surely holding a sleeve protecting a nozzle plate. <P>SOLUTION: A nozzle plate 30 has a cylindrical shape having a bottom, and comprises a bottom plate 31, a tube 37, and a flare part 39. The flare part 39 has an enlargement part 33 constantly enlarged in a radial inward direction, and a reinforcing part 34 restraining deformation in a radial inward direction. Since the rigidity of the nozzle plate 30 is increased, when a cylindrical sleeve 40 is fitted from the outside of the nozzle plate 30 and a projection of the sleeve 40 presses the flare part 39, the deformation of the enlargement part 33 in the radial inward direction is suppressed. Accordingly, the reduction of an outside diameter of the flare part 39 is suppressed so as to surely hold the sleeve 40 to a valve body 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel injection device, and more particularly to a fuel injection device that supplies fuel to an intake passage or a combustion chamber of an internal combustion engine.

  Conventionally, when a fuel injection device is attached to an intake pipe of an internal combustion engine, the fuel injection device may interfere with and contact the outer wall of the intake pipe. In order to prevent the nozzle plate provided at the tip of the fuel injection device from being damaged, a fuel injection device that protects the nozzle plate by fitting a sleeve outside the nozzle plate is known. In such a fuel injection device, as shown in Patent Documents 1 to 4, the sleeve is separated from the nozzle plate by engaging the protrusion formed on the inner peripheral wall of the sleeve with the open end of the outer peripheral wall of the nozzle plate. Prevents falling off.

  However, at the time of manufacturing the fuel injection device, the sleeve plate is attached to the valve body so that the projection of the sleeve passes over the open end of the outer peripheral wall of the nozzle plate, so that the open end of the nozzle plate is pressed inwardly by the projection. For this reason, when the outer diameter of the open end of the nozzle plate is reduced, the function of holding the nozzle plate sleeve may be reduced.

JP 2005-180199 A JP 2003-214288 A JP 2003-206826 A JP 2001-90640 A

  The objective of this invention is providing the fuel-injection apparatus which can hold | maintain the sleeve which protects the nozzle plate attached to a valve body to a valve body reliably.

According to the first aspect of the present invention, the valve body forms a fuel passage through which fuel flows and has a valve seat. The valve member opens and closes the fuel passage by contacting or separating from the valve seat. The nozzle plate has a bottomed cylindrical shape and includes a bottom plate portion, a cylindrical portion, and a flare portion. The bottom plate portion is provided on the outlet side of the fuel passage on the outer wall of the valve body, and has an injection hole communicating with the fuel passage. The tube portion rises from the outer edge of the bottom plate portion. The flare portion extends outward from the opening end of the cylindrical portion. The sleeve has a cylindrical shape, has a protrusion on the inner peripheral wall, is fitted from the outside of the nozzle plate, and the protrusion and the flare portion are engaged to protect the nozzle plate. The flare portion has an enlarged portion that uniformly spreads in the radially outward direction and a reinforcing portion that suppresses deformation of the enlarged portion in the radially inner direction.
In the nozzle plate, since the reinforcing part increases the rigidity of the enlarged part, when the sleeve is fitted from the outside of the nozzle plate, when the projection of the sleeve presses the flare part, the enlarged part is deformed in the radial direction. Since it suppresses, it is suppressed that the outer diameter of a flare part becomes small. Thus, the fuel injection device can reliably hold the sleeve on the valve body.

According to invention of Claim 2, an enlarged part and a reinforcement part are formed in the waveform at the circumferential direction, and comprise a waveform part. The corrugated portion is bent in the inner and outer directions and in the axial vertical direction at predetermined intervals in the circumferential direction, and high rigidity can be ensured by this corrugated structure.
According to the invention described in claim 3, the enlarged portion and the reinforcing portion are bent at a portion extending from the opening end of the cylindrical portion, and the further extending portion forms a double-layered plate thickness structure to be a bent portion. The bent portion can ensure high rigidity by overlapping the enlarged portion and the reinforcing portion in two layers in the radial direction.

According to the fourth aspect of the present invention, the enlarged portion and the reinforcing portion are wound by winding a portion extending from the opening end of the cylindrical portion in the radially outward direction and further winding a portion extending in the radially inward direction. Part. The winding portion can ensure high rigidity by a ring-shaped structure extending in the circumferential direction.
According to the invention described in claim 5, the enlarged portion and the reinforcing portion are formed by bending the flare portion. The reinforcing portion is work-hardened by plastic deformation, and can suppress deformation of the flare portion in the radial direction.

According to the sixth aspect of the present invention, the enlarged portion and the reinforcing portion are integrally formed and become a thick portion thicker than the thickness of the bottom plate portion. The thick part can ensure high rigidity by being formed thicker than the thickness of the bottom plate part.
According to the seventh aspect of the present invention, when the sleeve is fitted from the outside of the nozzle plate when assembled, the reinforcing portion deforms in the radially inward direction of the enlarged portion when the projection of the sleeve gets over the flare portion. Suppress.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
1 to 6 show a fuel injection device according to a first embodiment of the present invention. The fuel injection device 1 includes a cylindrical member 12, a valve body 20, a nozzle plate 30, a sleeve 40, a valve member 50, a movable core 60, a fixed core 70, a spring 80, a coil 90, and the like.

  The cylindrical member 12 is formed in a cylindrical shape, and has a first magnetic portion 13, a nonmagnetic portion 14, and a second magnetic portion 15 in order from the lower valve body 20 side in FIG. The first magnetic part 13 and the second magnetic part 15 are made of a magnetic material, and the nonmagnetic part 14 is made of a nonmagnetic material. The first magnetic part 13 and the nonmagnetic part 14, and the nonmagnetic part 14 and the second magnetic part 15 are coupled by laser welding or the like. The nonmagnetic part 14 prevents the magnetic flux from being short-circuited between the first magnetic part 13 and the second magnetic part 15. The cylindrical member 12 accommodates the fuel filter 18 at the end on the counter valve body side into which fuel flows.

  The valve body 20 is formed in a cylindrical shape, and is fixed to the inner peripheral wall of the end portion of the first magnetic portion 13 on the nozzle plate 30 side by a welded portion 8 as shown in FIG. The valve body 20 has a fuel passage 21 through which fuel flows toward the nozzle holes 32 of the nozzle plate 30 inside the inner peripheral wall. The valve body 20 has a valve seat 22 on the inclined surface of the inner peripheral wall whose inner diameter decreases toward the nozzle hole 32.

  As shown in FIGS. 3 to 5, the nozzle plate 30 includes a bottom plate portion 31, a cylindrical portion 37, and a flare portion 39, and is integrally formed in a bottomed cylindrical shape with metal or the like. The bottom plate portion 31 is formed in a thin disk shape and has a plurality of injection holes 32 communicating with the fuel passage at the center. The bottom plate portion 31 is fixed to the bottom outer wall on the outlet side of the fuel passage 21 of the valve body 20 by the welded portion 9.

5A is a partial longitudinal sectional view of the nozzle plate 30, and FIG. 5B is a diagram in which end surfaces of the enlarged portion 33 and the reinforcing portion 34 corresponding to FIG.
The cylindrical portion 37 is formed in a cylindrical shape, rises vertically from the outer edge of the bottom plate portion 31, and abuts its inner peripheral wall on the outer peripheral wall of the valve body 20. The plate thickness of the cylindrical portion 37 and the plate thickness of the bottom plate portion 31 are formed substantially the same.
The flare part 39 extends radially outward from the opening end 38 of the cylindrical part 37 on the side opposite to the bottom plate part. The flare portion 39 includes an enlarged portion 33 that uniformly spreads in the radially outward direction, and a reinforcing portion 34 that increases the rigidity of the enlarged portion 33 and suppresses deformation of the enlarged portion 33. The enlarged portion 33 and the reinforcing portion 34 are formed into a waveform by being bent by a press or the like in the radial direction and the axial direction at predetermined intervals in the circumferential direction over the entire circumference. The enlarged portion 33 and the reinforcing portion 34 have a wave shape in which a cross section parallel to the axial direction swings up and down in the axial direction, and a wave shape in which a cross section perpendicular to the axial direction swings in the inner and outer directions. The reinforcing part 34 and the enlarged part 33 correspond to the corrugated part in the claims.

  As shown in FIG. 3, the engaging surface 35 which is the outermost end surface of the reinforcing portion 34 and the enlarged portion 33 is formed in a circular shape when viewed from the axial direction. For this reason, as shown in FIG. 5, the end face of the locking surface 35 has a wave shape. The locking surface 35 is formed so that its outer diameter is slightly smaller than the diameter of the inner wall 45 of the sleeve 40. In FIG. 5, the lead lines of the enlarged portion 33 and the reinforcing portion 34 are illustrated as shown for convenience. The site | part which exhibits each of these functions overlaps.

The sleeve 40 is formed in a cylindrical shape with resin or the like, and is fitted to the outside of the nozzle plate 30 as shown in FIG. The sleeve 40 has a holding cylinder portion 42 that surrounds the outer peripheral side of the nozzle plate 30. The holding cylinder part 42 has a protrusion 44 that protrudes inward in the radial direction on the inner peripheral wall of the holding cylinder part 42. The protrusion 44 engages with the anti-bottom plate portion side of the flare portion 39 on the bottom plate portion side in the axial direction.
The end portion of the sleeve 40 on the bottom plate portion side is bent in the radially inward direction to form a holding plate portion 41. The holding plate portion 41 abuts against the bottom plate portion 31 of the nozzle plate 30 from the counter valve body side. The holding plate portion 41 has an opening 43 that surrounds the outer periphery of the center portion of the bottom plate portion 31 in which the nozzle holes 32 are formed. The sleeve 40 protects the nozzle plate 30. A method for assembling the sleeve 40 to the nozzle plate 30 will be described later.

  The valve member 50 is formed in a bottomed cylindrical shape and is coaxially accommodated on the inner peripheral side of the first magnetic part 13 and the valve body 20. The valve member 50 is guided by the inner peripheral portion 23 of the valve body 20 and can reciprocate in the axial direction. The valve member 50 has a plurality of fuel holes 52 communicating from the inner wall surface of the peripheral wall to the outer wall surface. The valve member 50 forms a contact portion 51 on the bottom wall. The contact portion 51 can be seated on the valve seat 22 of the valve body 20. The fuel passage is closed when the contact portion 51 contacts the valve seat 22. The fuel passage is opened when the contact portion 51 is separated from the valve seat 22.

The movable core 60 is formed in a cylindrical shape from a magnetic material, and is fixed to the outer wall of the end portion of the valve member 50 opposite to the contact portion 51. The movable core 60 is integrated with the valve member 50 and can reciprocate.
The fixed core 70 is formed in a cylindrical shape from a magnetic material, and is fixed to the inner peripheral walls of the nonmagnetic portion 14 and the second magnetic portion 15. The fixed core 70 is provided to face the movable core 60 on the opposite side of the movable core 60 from the valve member 50.

  One end of the spring 80 is locked to the movable core 60, and the other end is locked to an adjusting pipe 81 press-fitted inside the fixed core 70. The biasing force of the spring 80 is adjusted by adjusting the press-fitting amount of the adjusting pipe 81 into the fixed core 70. The spring 80 applies a restoring force generated by elastic deformation to the movable core 60. Accordingly, the spring 80 biases the valve member 50 in the direction in which the valve member 50 is seated on the valve seat 22.

A spool 91 around which the coil 90 is wound is fixed to the outer peripheral wall of the cylindrical member 12. On the outside of the coil 90, magnetic members 94 and 95 made of a magnetic material and magnetically connected are provided. The magnetic member 94 is magnetically connected to the first magnetic part 13, and the magnetic member 95 is magnetically connected to the second magnetic part 15. The housing 75 covers the outer peripheral side of the cylindrical member 12 and the magnetic members 94 and 95. The movable core 60, the first magnetic part 13, the magnetic members 94 and 95, the second magnetic part 15 and the fixed core 70 constitute a magnetic circuit.
The terminal 92 is electrically connected to the coil 90. A drive current is supplied to the coil 90 through the terminal 92.

  The pressurized fuel that has flowed in from the end of the tubular member 12 on the side opposite to the valve body is freed of foreign matter contained by the fuel filter 18, and the fuel passage in the fixed core 70, the fuel passage in the movable core 60, and the valve member 50. It reaches the fuel passage 21 in the valve body 20 via the fuel passage and the fuel hole 52 inside. The fuel that has reached the fuel passage 21 is injected from the injection hole 32 through the gap formed between the contact portion 51 and the valve seat 22 when the contact portion 51 is separated from the valve seat 22.

  In the fuel injection device 1, when energizing the coil 90 is turned off, no magnetic attractive force is generated between the movable core 60 and the fixed core 70. The valve member 50 moves toward the valve seat 22 by the restoring force of the spring 80. When the contact portion 51 is seated on the valve seat 22, the injection hole 32 is closed and fuel injection is shut off.

  When energization of the coil 90 is turned on, magnetic flux flows through a magnetic circuit composed of the movable core 60, the first magnetic part 13, the magnetic members 94 and 95, the second magnetic part 15, and the fixed core 70, and the fixed core 70 and the movable core A magnetic attraction force is generated between As a result, the movable core 60 is attracted toward the fixed core 70, and the valve member 50 moves in the direction of the fixed core 70 against the restoring force of the spring 80 together with the movable core 60. When the contact portion 51 is separated from the valve seat 22, the fuel in the fuel passage 21 is injected from the injection hole 32. Thereafter, when the power supply to the coil 90 is turned off, the magnetic flux flowing through the magnetic circuit disappears, the magnetic attractive force between the fixed core 70 and the movable core 60 disappears, and the contact portion 51 is seated on the valve seat 22. Thus, one fuel injection operation is completed.

Next, a method for assembling the sleeve 40 will be described.
In order to assemble the sleeve 40 to the valve body 20 during the manufacturing process of the fuel injection device 1, as shown in FIG. 6, the holding cylinder portion 42 of the sleeve 40 is fitted from the end portion 46 to the outside of the nozzle plate 30. As the fitting operation proceeds, the protrusion 44 of the holding cylinder portion 42 is guided to the outer wall surface of the flare portion 39 of the nozzle plate 30 and gets over the locking surface 35. At this time, the projection 44 of the sleeve 40 presses the flare portion 39 in the radially inward direction. The protrusion 44 that has passed over the locking surface 35 engages with the end of the flare 39 on the side opposite to the bottom plate.

  In the fuel injection device 1 according to the present embodiment, the nozzle plate has a cantilever structure in which the bottom plate portion 31 is fixed to the bottom plate portion of the valve body 20 at the welded portion b, and the flare portion 39 extends in the radially outward direction. . The enlarged portion 33 and the reinforcing portion 34 ensure high rigidity due to the wave-shaped structure. For this reason, when the sleeve 40 is assembled to the nozzle plate 30, the outer shape of the flare portion 39 is suppressed from being plastically deformed in the radially inward direction when the projection 44 of the sleeve 40 gets over the locking surface 35. As a result, the fuel injection device 1 can reliably hold the sleeve 40 on the valve body 20.

(Second Embodiment)
A fuel injection device according to a second embodiment of the present invention is shown in FIGS. Components that are substantially the same as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
The nozzle plate 302 of the fuel injection device 2 according to the second embodiment is integrally formed from the bottom plate portion 31, the cylindrical portion 372, and the flare portion 392.
The cylindrical portion 372 is formed in a cylindrical shape and rises vertically from the outer edge of the bottom plate portion 31.

The flare part 392 extends outward from the opening end of the cylindrical part 372 and has an enlarged part 332 and a reinforcing part 342.
The enlarged portion 333 and the reinforcing portion 342 are formed by folding back a member extending from the opening end 382 of the cylindrical portion 372 toward the opposite bottom plate portion by a press or the like. The enlarged portion 333 and the reinforcing portion 342 are folded at the end on the side opposite to the bottom plate portion in the axial direction, and further extending portions overlap in two layers in the radial direction. The portion overlapping the two layers extends to the vicinity of the bottom plate portion 31. The enlarged portion 332 and the reinforcing portion 342 correspond to a bent portion in the claims.
The locking surface 352 that is the outermost peripheral edge of the enlarged portion 332 and the reinforcing portion 342 is formed slightly smaller than the inner wall 45 of the sleeve 40.

  In the fuel injection device 2 according to the present embodiment, the enlarged portion 332 and the reinforcing portion 342 form a two-layer thickness structure to ensure high rigidity. For this reason, when the sleeve 40 is assembled to the nozzle plate 302, the outer shape of the flare portion 392 is suppressed from being plastically deformed in the radial direction when the projection 44 of the sleeve 40 gets over the locking surface 352. As a result, the fuel injection device 2 can reliably hold the sleeve 40 on the valve body 20.

(Third embodiment)
A fuel injection device according to a third embodiment of the present invention is shown in FIGS. Components substantially the same as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.
The nozzle plate 303 of the fuel injection device 3 according to the third embodiment is integrally formed from the bottom plate portion 31, the cylinder portion 373 and the flare portion 393. The cylindrical portion 373 is formed in a cylindrical shape and rises vertically from the outer edge of the bottom plate portion 31.

The flare part 393 is formed by rewinding a member extending from the opening end 383 from the cylindrical part 373 toward the opposite bottom plate part by pressing or the like. The flare portion 393 includes an enlarged portion 333 and a reinforcing portion 343. The enlarged portion 333 and the reinforcing portion 343 are formed by winding a portion extending from the opening end 382 from the tubular portion 373 toward the opposite bottom plate portion in the radially outward direction, and further extending a portion extending in the radially inward direction. 373 abuts. The enlarged portion 333 and the reinforcing portion 343 correspond to a winding portion in the claims.
The locking surface 353 that is the outermost peripheral edge of the reinforcing portion 343 is formed to be slightly smaller than the inner wall 45 of the sleeve 40.

  In the fuel injection device 3 according to the present embodiment, the enlarged portion 333 and the reinforcing portion 343 are formed in a ring shape extending in the circumferential direction, thereby ensuring high rigidity. Therefore, when the sleeve 40 is assembled to the nozzle plate 303, the outer shape of the flare portion 393 is suppressed from being plastically deformed in the radial direction when the projection 44 of the sleeve 40 gets over the locking surface 353. Thus, the fuel injection device 3 can reliably hold the sleeve 40 on the valve body 20.

(Fourth embodiment)
A fuel injection device according to a fourth embodiment of the present invention is shown in FIGS. Components substantially the same as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.
The nozzle plate 304 of the fuel injection device 4 according to the fourth embodiment includes a bottom plate portion 31, a cylindrical portion 374, and a flare portion 394. The flare portion 394 extends radially outward from the opening end 384 on the opposite bottom plate portion side of the cylindrical portion 374, and has an enlarged portion 334 and a reinforcing portion 344. The cylindrical portion 374, the enlarged portion 334, and the reinforcing portion 344 are integrally formed.
The plate thickness of the cylindrical portion 374, the enlarged portion 334, and the reinforcing portion 344 is formed to be thicker than the plate thickness of the bottom plate portion 31. The enlarged portion 334 and the reinforcing portion 344 correspond to the thick portion in the claims.
The locking surface 354 that is the outermost peripheral edge of the enlarged portion 334 and the reinforcing portion 344 is slightly smaller than the inner wall 45 of the sleeve 40 and is formed substantially parallel to the axial direction.

  In the fuel injection device 4 according to the present embodiment, the enlarged portion 334 and the reinforcing portion 344 are integrally formed with a large thickness to ensure high rigidity. For this reason, when the sleeve 40 is assembled to the nozzle plate 302, the outer shape of the flare portion 394 is suppressed from being plastically deformed in the radial direction when the projection 44 of the sleeve 40 gets over the locking surface 354. Thereby, the fuel injection device 4 can reliably hold the sleeve 40 on the valve body 20.

  Here, the atomization characteristics of the spray and the spray angle in the fuel injection device are determined by the relationship t / d between the nozzle hole thickness t and the nozzle hole diameter d of the nozzle plate. In order to reduce the injection hole diameter d in the small injection amount fuel injection device, it is required to reduce the injection hole plate thickness t in order to satisfy the above relationship. In the fuel injection device according to the first to fourth embodiments, in the fuel injection device in which the nozzle hole plate thickness t of the nozzle plate is reduced, the reinforcing portion increases the rigidity of the enlarged portion, and the flare portion inward in the radial direction with respect to external force. Deformation can be suppressed. For this reason, when the sleeve is fitted from the outside of the nozzle plate, the outer diameter of the flare portion is suppressed from being reduced when the projection of the sleeve presses the flare portion. As a result, the sleeve can be reliably held on the valve body.

In the fuel injection devices according to the first to fourth embodiments, the flare portion of the nozzle plate is provided at a position away from the bottom plate portion on the anti-bottom plate portion side of the flare portion, and the locking surface is the sleeve. A minute gap is formed with the inner wall. For this reason, distortion of the bottom plate portion due to the pressing of the locking surface is suppressed, and a problem that the sealing performance between the bottom plate portion and the valve body is less likely to occur.
Furthermore, when the sleeve is thermally expanded at a high temperature after the protrusion is engaged with the flare portion, the sleeve is removed from the valve body because the area of the locking surface is large even if the sleeve moves away from the nozzle plate. Separation can be prevented.

(Other embodiments)
In the first to third embodiments, the enlarged portion and the reinforcing portion of the nozzle plate are formed by bending. On the other hand, the enlarged portion and the reinforcing portion of the nozzle plate may be formed as separate members and connected together by laser welding or the like to be integrally formed.
In the first to fourth embodiments, the locking surface of the nozzle plate is formed in parallel with the axial direction. On the other hand, the locking surface of the nozzle plate may be formed with an axial direction and an inclination.
As described above, the present invention is not limited to the above-described embodiment, and can be applied to other various embodiments in addition to combining the plurality of embodiments without departing from the gist thereof.

Sectional drawing which shows the principal part of the fuel-injection apparatus by 1st Embodiment of this invention. Sectional drawing which shows the fuel-injection apparatus by 1st Embodiment of this invention. The top view of the valve body and nozzle plate of 1st Embodiment of this invention. The side view of the valve body and nozzle plate of 1st Embodiment of this invention. The schematic diagram of the nozzle plate of 1st Embodiment of this invention. The figure which shows the assembly | attachment point of the sleeve of 1st Embodiment of this invention. The side view of the valve body and nozzle plate of 2nd Embodiment of this invention. Sectional drawing which shows the principal part of the fuel-injection apparatus by 2nd Embodiment of this invention. The side view of 3rd Embodiment valve body and nozzle plate of this invention. Sectional drawing which shows the principal part of the fuel-injection apparatus by 3rd Embodiment of this invention. The side view of the valve body and nozzle plate of 4th Embodiment of this invention. Sectional drawing which shows the principal part of the fuel-injection apparatus by 4th Embodiment of this invention.

Explanation of symbols

  1: fuel injection device, 12: cylindrical member, 20: valve body, 21: fuel passage, 22: valve seat, 30: nozzle plate, 31: bottom plate part, 32: injection hole, 33: expansion part, 34: Reinforcing part, 35: locking surface, 37: cylindrical part, 38: open end, 39: flare part, 40: sleeve, 41: holding plate part, 42: cylindrical part, 44: protrusion, 50: valve member, 60: Movable core, 70: Fixed core, 75: Housing, 80: Spring, 90: Coil

Claims (7)

Forming a fuel passage through which fuel flows, and a valve body having a valve seat;
A valve member that opens and closes the fuel passage by contacting or separating from the valve seat;
A bottom plate portion having a bottomed cylindrical shape, provided on the outlet side of the fuel passage on the outer wall of the valve body, and having a nozzle hole communicating with the fuel passage; a cylinder portion rising from an outer edge of the bottom plate portion; and A nozzle plate composed of a flare portion extending radially outward from the opening end of the cylindrical portion;
A sleeve having a cylindrical shape, having a protrusion on an inner peripheral wall, fitted from the outside of the nozzle plate, the protrusion and the flare portion being engaged, and protecting the nozzle plate;
With
The said flare part has an enlarged part which spreads uniformly in a radial direction, and a reinforcement part which suppresses a deformation | transformation to the radial direction of this enlarged part, The fuel injection apparatus characterized by the above-mentioned.   2. The fuel injection device according to claim 1, wherein the enlarged portion and the reinforcing portion constitute a corrugated portion formed in a wave shape in a circumferential direction.   2. The enlarged portion and the reinforcing portion are bent at a portion extending from an opening end of the cylindrical portion, and the further extended portion is a bent portion forming a two-layer plate thickness structure. Fuel injectors.   The enlarged portion and the reinforcing portion are a winding portion in which a portion extending from the opening end of the cylindrical portion is wound in the radially outward direction and a further extending portion is wound in the radially inward direction. The fuel injection device according to claim 1.   The fuel injection device according to any one of claims 2 to 4, wherein the enlarged portion and the reinforcing portion are formed by bending the flare portion.   2. The fuel injection device according to claim 1, wherein the cylindrical portion, the enlarged portion, and the reinforcing portion are integrally formed to be a thick portion that is thicker than a thickness of the bottom plate portion.   The said reinforcement part suppresses the deformation | transformation to the radial direction of the said enlarged part when the said protrusion of the said sleeve gets over the said flare part with the said enlarged part. The fuel injection device according to item.

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