JP2009281347A - Fuel injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection device inhibiting accumulation of deposit in a valve body. <P>SOLUTION: The valve body 21 includes a valve seat formed on an inner wall 24, and an injection hole 60 providing communication between the inner wall 24 and an outer wall 29 and formed with a center axis line inclined to an axial direction. The needle valve 40 opens and closes a fuel passage 28 by separating from or abutting on the valve seat 23. The valve body 21 includes a guide groove 50 guiding combustion gas flowing in through an outlet 62 of the injection hole 60 from the outside of the valve body 21 on an upper surface 63 of the inner wall forming the injection hole 60. Consequently, quantity of combustion gas intruding into the valve body 21 can be reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel injection device that injects and supplies fuel to an internal combustion engine.

  Conventionally, in a fuel injection device that directly injects fuel into a cylinder of an internal combustion engine (hereinafter, the internal combustion engine is referred to as an “engine”), for example, as shown in FIG. It may enter the valve body 211 through the nozzle hole 601 in the direction, and deposit 2 may be generated in the valve body 211 due to deterioration of combustion products and residual fuel. If the deposit 2 is deposited on the inner wall 241 of the valve body 211 and the end surface 421 of the needle valve 401 on the injection hole side, there is a concern about a decrease in the fuel injection amount due to a reduction in the fuel passage and a change in the spray shape due to a change in the fuel flow path. The

In Patent Document 1, a magnetic field surrounding the nozzle hole is generated outside the valve body to form a barrier for oxygen molecules, and the combustion gas is prevented from entering the valve body through the nozzle hole. Moreover, in patent document 2, the shielding mechanism part which shields or open | releases a nozzle hole is provided in the outer side of the valve body, and it suppresses that a combustion gas penetrate | invades into a valve body.
However, in Patent Document 1, it is necessary to provide a mechanism for generating a magnetic field in the fuel injection device. Further, in Patent Document 2, it is necessary to drive and control the blocking mechanism so that the injection hole is shielded when the fuel injection is stopped and the injection hole is opened when the fuel injection is performed. This complicates the process of manufacturing the fuel injection device.

Japanese Patent Laid-Open No. 2004-19582 JP 2007-132222 A

  An object of the present invention is to provide a fuel injection device that suppresses deposit accumulation in a valve body.

  According to the first aspect of the present invention, the valve body is formed on the valve seat formed on the inner wall, the inner wall and the outer wall are connected downstream of the fuel flow of the valve seat, and the central axis is inclined with respect to the axial direction. And a fuel passage communicating with the nozzle hole. The needle valve is provided so as to be capable of reciprocating in the axial direction inside the valve body, and opens and closes the fuel passage by being separated from or in contact with the valve seat. The valve body has a guide groove that guides the combustion gas flowing into the inner wall forming the nozzle hole from the outside of the valve body through the outlet of the nozzle hole. For this reason, the quantity of the combustion gas which penetrate | invades in a valve body reduces, and it can suppress that a deposit accumulates in a valve body.

  According to the invention described in claim 2, the guide groove of the valve body is formed on the upper surface side of the inner wall forming the injection hole. Combustion gas flows along the upper surface side of the inner wall forming the nozzle hole. The guide groove of the valve body can guide the combustion gas with high efficiency. In addition, the upper surface side of the inner wall that forms the nozzle hole refers to the side of the inner wall that forms the nozzle hole that is close to the inner wall of the valve body in the axial direction of the valve body.

According to the third aspect of the present invention, when viewed from the outlet of the injection hole in the axial direction of the valve body, the guide groove of the valve body faces at least a part of the outline of the guide groove within the outline of the outlet of the injection hole. Yes. For this reason, the combustion gas which invades from the outside of the valve body can be directly guided to the guide groove.
According to the fourth aspect of the present invention, the guide groove of the valve body is formed in the same direction as the axis of the valve body. For this reason, the combustion gas which invades from the outside of the valve body can be guided to the guide groove with high efficiency.

  According to the fifth aspect of the present invention, the guide groove of the valve body is an inner wall that forms the injection hole and opens at a position away from the inlet and the outlet. The shape of the fuel spray injected from the nozzle hole is affected by the shape formed by the inner wall of the valve body and the inner wall forming the nozzle hole, and the shape formed by the outer wall of the valve body and the inner wall forming the nozzle hole. For this reason, the influence which it has on a spray shape can be made small because the guide groove is opening in the inner wall which forms a nozzle hole.

According to the sixth aspect of the present invention, the guide groove of the valve body extends to the vicinity of the inner wall of the valve body. For this reason, the quantity of the combustion gas guided to a guide groove can be increased.
According to the seventh aspect of the present invention, the guide groove of the valve body opens in the inner wall that extends in the direction perpendicular to the axis of the valve body and forms the injection hole. For this reason, the guide groove opens in a wide range on the inner wall of the nozzle hole. Thereby, the combustion gas guided to the guide groove during the combustion stroke is discharged with high efficiency during the fuel injection stroke. As a result, deposits can be prevented from accumulating in the guide groove.

  According to the eighth aspect of the present invention, the guide groove of the valve body forms a deep portion on the opposite side to the inner wall forming the injection hole in a curved shape. For this reason, the combustion gas guided to the guide groove during the combustion stroke is discharged with high efficiency during the fuel injection stroke, and deposits can be prevented from depositing in the deep portion of the guide groove.

According to invention of Claim 9, the guide groove of the valve body forms the deep part on the opposite side to the wall surface which forms a nozzle hole in the shape containing an unevenness | corrugation. For this reason, the volume of the guide groove can be increased and the amount of combustion gas guided to the guide groove can be increased.
According to a tenth aspect of the present invention, the valve body has an extension groove whose volume expands in the deep portion of the guide groove. By moving the combustion gas guided to the guide groove further to the extension groove, the amount of the combustion gas guided to the guide groove can be increased.

  According to the eleventh aspect of the present invention, the valve body has a plurality of guide grooves per nozzle hole. For this reason, the combustion gas which is going to penetrate | invade along the inner wall which forms a nozzle hole can be guided to a guide groove in multiple times.

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 (hereinafter, the fuel injection device is referred to as an “injector”). The injector 10 according to the first embodiment is applied to, for example, a direct injection gasoline engine. When applied to a direct-injection gasoline engine, the injector 10 is mounted on the cylinder head of the engine.

  As shown in FIG. 2, the housing 11 of the injector 10 is formed in a cylindrical shape having substantially the same inner diameter in the axial direction. The housing 11 has a first magnetic part 12, a nonmagnetic part 13, and a second magnetic part 14. The nonmagnetic part 13 prevents a magnetic short circuit between the first magnetic part 12 and the second magnetic part 14. The 1st magnetic part 12, the nonmagnetic part 13, and the 2nd magnetic part 14 are integrally connected by laser welding etc., for example. In addition, after forming the housing 11 integrally, a part may be magnetized or made nonmagnetic by thermal processing or the like.

  An inlet member 15 is provided at one end of the housing 11 in the axial direction. The inlet member 15 is press-fitted on the inner peripheral side of the housing 11. The inlet member 15 has a fuel inlet 16. The fuel inlet 16 is supplied with fuel pressurized by a fuel pump (not shown) from a fuel tank. The fuel supplied to the fuel inlet 16 flows into the inner peripheral side of the housing 11 via the filter 17. The filter 17 removes foreign matters contained in the fuel.

A holder 20 is provided at the other end of the housing 11 in the axial direction. The holder 20 is formed in a cylindrical shape, and a valve body 21 is provided inside.
The valve body 21 is formed in a cylindrical shape, and is fixed to the inside of the holder 20 by, for example, press fitting or welding. As shown in FIG. 3, the valve body 21 has a valve seat 23 on a conical inner wall. The valve body 21 has a nozzle hole 60 on the opposite side of the housing 11 from the valve seat 23. The nozzle hole 60 opens in the inner wall 24 and the outer wall 29 of the valve body 21.

  As shown in FIGS. 2 and 3, the needle valve 40 is accommodated so as to be reciprocally movable in the axial direction on the inner peripheral side of the housing 11, the holder 20, and the valve body 21. The needle valve 40 has a seat portion 41 at the end opposite to the fuel inlet 16. The seat portion 41 can contact the valve seat 23 of the valve body 21. A fuel passage 28 through which fuel flows is formed between the inner wall upstream of the valve seat 23 of the valve body 21 and the outer wall 43 upstream of the seat portion 41 of the needle valve 40. Further, the fuel reservoir chamber 27 is formed by the inner wall 24 on the downstream side of the valve seat 23 of the valve body 21 and the wall surface 42 on the downstream side of the seat portion 41 of the needle valve 40. The fuel passage 28 communicates with the nozzle hole 60 via the fuel reservoir chamber 27.

  The injector 10 has a drive unit 30 that drives the needle valve 40. The drive unit 30 includes a spool 31, a coil 32, a fixed core 33, a movable core 34, and a plate housing 35. The spool 31 is provided on the outer peripheral side of the housing 11. The spool 31 is formed of a resin in a cylindrical shape, and a coil 32 is wound on the outer peripheral side. The coil 32 is electrically connected to the terminal 37 of the connector 36. A fixed core 33 is provided on the inner peripheral side of the coil 32 across the housing 11. The fixed core 33 is formed in a cylindrical shape from a magnetic material such as iron, and is fixed to the inner peripheral side of the housing 11 by, for example, press fitting. The plate housing 35 is made of a magnetic material and covers the outer peripheral side of the coil 32. The plate housing 35 magnetically connects the second magnetic part 14 of the housing 11 and the holder 20. The outer peripheral side of the spool 31 and the coil 32 is covered with a resin mold 38 that integrally forms the connector 36.

  The movable core 34 is accommodated on the inner peripheral side of the housing 11 so as to be capable of reciprocating in the axial direction. The movable core 34 is formed in a cylindrical shape from a magnetic material such as iron. The end of the movable core 34 opposite to the fixed core 33 is fixed to the end of the needle valve 40 opposite to the nozzle hole 60. Thereby, the movable core 34 and the needle valve 40 are reciprocated in the axial direction integrally.

  The movable core 34 is in contact with the coil spring 18 at the end on the fixed core 33 side. The coil spring 18 has one end in contact with the movable core 34 and the other end in contact with the adjusting pipe 19. The adjusting pipe 19 is press-fitted into the fixed core 33. The load of the coil spring 18 is adjusted by adjusting the press-fitting amount of the adjusting pipe 19. The needle valve 40 and the movable core 34 are pressed by the coil spring 18 in the direction in which the seat portion 41 contacts the valve seat 23.

  When the coil 32 is not energized, the seat 41 is brought into contact with the valve seat 23 by the pressing force of the coil spring 18, and a predetermined gap is formed between the fixed core 33 and the movable core 34. When the coil 32 is energized, the movable core 34 is attracted by the fixed core 33, and the opposite surfaces of the fixed core 33 and the movable core 34 are in contact with each other. Thereby, the movement to the fixed core 33 side of the movable core 34 and the needle valve 40 is restrict | limited.

Next, the nozzle hole 60 and the guide groove 50 formed in the valve body 21 will be described.
As shown in FIG. 1, the nozzle hole 60 is formed on the downstream side of the fuel flow from the valve seat 23 of the valve body 21. The central axis of the nozzle hole 60 is inclined from the inlet 61 toward the outlet 62 so as to be far from the axis of the valve body 21.

  The guide groove 50 extends in the axial direction of the valve body 21 within the valve body 21. The wall surface 52 that forms the guide groove 50 is formed in a cylindrical shape. The guide groove 50 opens to the upper surface 63 side of the inner wall that forms the nozzle hole 60. When viewed in the axial direction of the body 21 from the outlet 62 of the nozzle hole 60, the contour of the guide groove 50 that faces the contour of the outlet 62. The guide groove 50 is formed from the nozzle hole 60 outlet 62 side by, for example, machining, electrical machining, laser machining, press working, or forging. The machining is performed by a drill, an end mill or a cutter, and the electrical machining is performed by electric discharge machining, electrolytic machining, or the like. Preferably, the operation process can be simplified by simultaneously forming the nozzle hole 60 and the guide groove 50 by laser processing. Thereby, the guide groove 50 is formed extending to the vicinity of the inner wall 24 of the valve body 21. The deep portion 51 of the guide groove 50 is formed in parallel with the inner wall 24 of the valve body 21.

The spray shape of the fuel injected from the nozzle hole 60 is the shape formed by the inner wall 24 of the valve body 21 and the inner wall forming the nozzle hole 60, and the outer wall 29 of the valve body 21 and the inner wall forming the nozzle hole 60. It is greatly affected by the shape. For this reason, the guide groove 50 is formed at a position away from the inlet 61 and the outlet 62 of the nozzle hole 60.
As shown in FIG. 4, the fuel flow 3 flowing from the fuel passage 28 toward the axis of the valve body 21 through the fuel reservoir 27 changes direction at the inlet 61 of the injection hole 60 and flows into the injection hole 60. . For this reason, the flow 4 of the fuel flowing through the nozzle hole 60 has a large flow velocity and flow rate along the lower surface 64 side of the nozzle hole 60. On the other hand, in the vicinity of the upper surface 63 side of the nozzle hole 60, there is a relatively small range in which the flow velocity and flow rate of fuel flow. The guide groove 50 corresponds to the inclination angle of the injection hole 60, and is formed in a relatively small range of the flow velocity and flow rate of the fuel on the upper surface 63 side of the inner wall forming the injection hole 60. For this reason, the influence which the guide groove 50 has on the spray shape can be reduced.

Next, the operation of the injector 10 having the above configuration will be described.
The fuel that has been pressurized by the fuel pump and flows from the fuel inlet 16 shown in FIG. 2 includes the filter 17, the inner peripheral side of the inlet member 15, the inner peripheral side of the adjusting pipe 19, the inner peripheral side of the movable core 34, and the movable core. 34 flows into the fuel passage 28 via the fuel hole 39 communicating from the inner peripheral side to the outer peripheral side and the inner peripheral side of the holder 20.
When energization of the coil 32 is stopped, no magnetic attractive force is generated between the fixed core 33 and the movable core 34. The movable core 34 is moved to the opposite side of the fixed core 33 by the pressing force of the coil spring 18. For this reason, the seat part 41 of the needle valve 40 is in contact with the valve seat 23. Therefore, fuel is not injected from the nozzle hole 60.
At this time, as shown in FIG. 5, the combustion gas 1 generated in the combustion stroke of the internal combustion engine and entering from the outlet 62 of the nozzle hole 60 flows directly into the guide groove 50 from the outlet 62 of the nozzle hole 60. Further, it flows into the guide groove 50 along the upper surface 63 of the inner wall that forms the nozzle hole 60. The combustion gas 1 that has reached the deep portion 51 of the guide groove 50 is folded back at the deep portion 51 and stops in the guide groove 50.

When the coil 32 is energized, the magnetic field generated in the coil 32 causes a magnetic flux to flow in the magnetic circuit including the plate housing 35, the holder 20, the first magnetic part 12, the movable core 34, the fixed core 33, and the second magnetic part 14, A magnetic attractive force is generated between the fixed core 33 and the movable core 34. When this magnetic attraction force becomes larger than the pressing force of the coil spring 18, the movable core 34 and the needle valve 40 move toward the fixed core. Therefore, the seat portion 41 of the needle valve 40 is separated from the valve seat 23, and the fuel in the fuel passage 28 is injected from the injection hole 60 through the fuel reservoir chamber 27.
At this time, as shown in FIG. 6, the combustion gas 5 guided into the guide groove 50 is discharged to the outside of the valve body 21 through the nozzle hole 60 by the negative pressure of the nozzle hole 60 and the combustion chamber.

  When energization of the coil 32 is stopped, the magnetic attractive force between the fixed core 33 and the movable core 34 disappears. The movable core 34 and the needle valve 40 move to the opposite side of the fixed core 33 by the pressing force of the coil spring 18. For this reason, the movable core 34 and the needle valve 40 abut against the valve seat 23, the flow of fuel from the fuel passage 28 to the fuel reservoir 27 is cut off, and one fuel injection is completed.

In the injector 10 according to the present embodiment, the valve body 21 has a guide groove 50 on the upper surface 63 of the inner wall forming the injection hole 60. For this reason, it is possible to guide the combustion gas 1 that is about to enter the fuel reservoir 27 to the guide groove 50, and to prevent the combustion gas from entering the fuel reservoir 27. For this reason, deposits can be suppressed from accumulating in the fuel reservoir chamber 27.
Furthermore, the guide groove 50 is formed at a position where the flow rate and flow rate of the injected fuel are relatively small, away from the inlet 61 and the outlet 62 of the nozzle hole 60. For this reason, since the guide groove 50 is opened in the inner wall which forms the nozzle hole 60, the influence which it has on the spray shape of a fuel can be decreased.

(Second Embodiment)
An injector according to a second embodiment of the present invention is shown in FIG. The second embodiment corresponds to claim 7. Components substantially the same as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
In the second embodiment, the guide groove 50 extending in the same direction as the axis of the valve body 21 expands in the radial direction and opens widely in the inner wall forming the injection hole 60. The guide groove 50 opens on the inner wall of the injection hole 60 in the same range as the range extending in the axial direction of the valve body 21. For this reason, the combustion gas guided to the guide groove 50 in the combustion stroke of the internal combustion engine is discharged from the guide groove 50 with high efficiency at the time of fuel injection in the intake stroke or the compression process. As a result, deposits can be prevented from being deposited in the guide groove 50.

(Third embodiment)
An injector according to a third embodiment of the present invention is shown in FIG. The third embodiment corresponds to claim 8. Components substantially the same as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.
In the third embodiment, the deep portion 51 of the guide groove 50 is formed in a hemispherical shape. Here, the hemispherical shape means that the circumference decreases toward the top, and does not necessarily mean a spherical half. By forming the deep portion 51 in such a curved surface, when the combustion gas guided to the guide groove 50 is discharged from the guide groove 50 during fuel injection, the combustion gas guided to the vicinity of the deep portion 51 is highly efficient. Discharged. As a result, deposits can be prevented from being deposited in the deep part 51.

(Fourth embodiment)
An injector according to a fourth embodiment of the present invention is shown in FIG. The fourth embodiment corresponds to claim 9. Components substantially the same as those in the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted.
In the fourth embodiment, the center of the deep portion 51 of the guide groove 50 is formed to protrude toward the nozzle hole 60 outlet 62 side. In this way, by forming the deep portion 51 of the guide groove 50 into a shape including irregularities, the volume of the guide groove 50 can be reduced even when the range in which the guide groove 50 can be formed in the valve body 21 is limited. Can be bigger. As a result, the amount by which the combustion gas is guided into the guide groove 50 can be increased, and deposits can be prevented from accumulating in the valve body 21.

(Fifth embodiment)
An injector according to a fifth embodiment of the present invention is shown in FIG. The fifth embodiment corresponds to claim 10. Components substantially the same as those in the first to fourth embodiments are denoted by the same reference numerals, and description thereof is omitted.
In the fifth embodiment, the valve body is divided into a first valve body 25 on the inner wall 24 side and a second valve body on the outer wall 29 side. An extension groove 55 extending in a direction perpendicular to the axis of the valve body 21 is formed on the surface of the first valve body 25 on the side opposite to the inner wall 24. The extension groove 55 is formed larger than the cross section of the guide groove 50, and one end communicates with the deep part of the guide groove 50. The extension groove 55 is formed by, for example, machining, electrical machining, laser machining, pressing, or forging. After the extension groove 55 is formed in the first valve body 25, the first valve body 25 and the second valve body 26 are joined. The 1st valve body 25 and the 2nd valve body 26 are joined by welding, brazing welding, etc., for example.
Combustion gas entering from the outlet 62 of the nozzle hole 60 moves to the extension groove 55 through the guide groove 50. For this reason, the quantity of the combustion gas guided to the guide groove 50 can be increased.

(Sixth to eighth embodiments)
Injectors according to sixth to eighth embodiments of the present invention are shown in FIGS. 11 to 13, respectively. FIGS. 11-13 is the figure which looked at the nozzle hole 60 from the outer wall 29 side of the valve body 21. FIG. Components substantially the same as those in the first to fifth embodiments are denoted by the same reference numerals and description thereof is omitted.
In the sixth embodiment, the opening 56 in which the guide groove 50 opens in the inner wall forming the injection hole 60 is formed in a rectangular shape when viewed from the outlet 62 side of the injection hole 60. The opening 56 is formed in a wide range from the inlet 61 to the outlet 62 in the upper surface 63 of the inner wall that forms the nozzle hole 60. For this reason, combustion gas can be guided to the guide groove 50 with high efficiency.
In the seventh embodiment, the opening 57 of the guide groove 50 is formed in a triangular shape that becomes smaller on the outlet 62 side when viewed from the outlet 62 side of the nozzle hole 60. By reducing the shape change between the outer wall 29 of the valve body 21 and the inner wall forming the nozzle hole 60 on the outlet 62 side of the nozzle hole 60, the influence on the spray shape can be reduced.
In the eighth embodiment, the opening 58 of the guide groove 50 is formed relatively small on the upper surface 63 of the inner wall that forms the injection hole 60. For this reason, the influence which the guide groove 50 has on the spray shape can be reduced.

(Other embodiments)
In 1st Embodiment mentioned above, the injector 10 applied to a direct injection type gasoline engine was demonstrated. On the other hand, the injector of the present invention is applicable to a port injection type gasoline engine that injects fuel into intake air flowing through an intake port, an exhaust pipe injection type gasoline engine that injects fuel into exhaust gas in an exhaust pipe, or a diesel engine. .
In the first embodiment described above, the injector 10 that electromagnetically drives the needle valve 40 has been described as an example. In contrast, the present invention can be applied to an injector that drives the needle valve 40 with hydraulic pressure.
In the first to fifth embodiments described above, one guide groove is formed for each nozzle hole. On the other hand, a plurality of guide grooves may be formed per one nozzle hole. Thereby, the combustion gas which intrudes along the upper surface of the inner wall which forms a nozzle hole can be guided to a guide groove in multiple times.
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.

The schematic diagram 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 enlarged view of the III part of FIG. The enlarged view of IV part of FIG. The schematic diagram which shows the principal part of the fuel-injection apparatus by 1st Embodiment of this invention. The schematic diagram which shows the principal part of the fuel-injection apparatus by 1st Embodiment of this invention. The schematic diagram which shows the principal part of the fuel-injection apparatus by 2nd Embodiment of this invention. The schematic diagram which shows the principal part of the fuel-injection apparatus by 3rd Embodiment of this invention. The schematic diagram which shows the principal part of the fuel-injection apparatus by 4th Embodiment of this invention. The schematic diagram which shows the principal part of the fuel-injection apparatus by 5th Embodiment of this invention. The schematic diagram which shows the principal part of the fuel-injection apparatus by 6th Embodiment of this invention. The schematic diagram which shows the principal part of the fuel-injection apparatus by 7th Embodiment of this invention. The schematic diagram which shows the principal part of the fuel-injection apparatus by 8th Embodiment of this invention. The schematic diagram which shows the edge part by the side of the injection hole of the conventional fuel injection apparatus.

Explanation of symbols

  10: Injector, 21: Valve body, 23: Valve seat, 24: Inner wall, 25: Injection hole, 27: Fuel reservoir, 28: Fuel passage, 29: Outer wall, 40: Needle valve, 50: Guide groove, 60: Nozzle hole, 61: inlet, 62: outlet, 63: upper surface

Claims (11)

A valve seat formed on the inner wall, a nozzle hole formed on the downstream side of the fuel flow of the valve seat between the inner wall and the outer wall and having a central axis inclined with respect to the axial direction, and communicated with the nozzle hole A valve body having a fuel passage;
A needle valve that is provided so as to be capable of reciprocating in the axial direction inside the valve body, and that opens or closes a fuel passage by being separated from or in contact with the valve seat;
With
The fuel injection device according to claim 1, wherein the valve body has a guide groove that guides combustion gas flowing from the outside of the valve body through an outlet of the nozzle hole to an inner wall that forms the nozzle hole.   The fuel injection device according to claim 1, wherein the guide groove of the valve body is formed on an upper surface side of the inner wall that forms the injection hole.   The guide groove of the valve body is configured such that when the outlet of the injection hole is viewed in the axial direction of the valve body, the outline of at least a part of the guide groove faces the outline of the outlet of the injection hole. The fuel injection device according to claim 1, wherein the fuel injection device is a fuel injection device.   The fuel injection device according to any one of claims 1 to 3, wherein the guide groove of the valve body is formed in the same direction as an axis of the valve body.   The said guide groove of the said valve body is the said inner wall which forms the said nozzle hole, and is opened in the position away from the said inlet and the said exit, The any one of Claims 1-4 characterized by the above-mentioned. Fuel injectors.   The fuel injection device according to claim 1, wherein the guide groove of the valve body extends to the vicinity of the inner wall of the valve body.   The fuel injection device according to any one of claims 1 to 5, wherein the guide groove of the valve body extends in a radial direction of the valve body and opens in the inner wall forming the injection hole.   The fuel injection according to any one of claims 1 to 5, wherein the guide groove of the valve body has a deep portion opposite to the inner wall forming the injection hole formed in a curved shape. apparatus.   The said guide groove of the said valve body forms the deep part on the opposite side to the said inner wall which forms the said nozzle hole in the shape containing an unevenness | corrugation, The Claim 1 characterized by the above-mentioned. Fuel injection device.   The fuel injection device according to any one of claims 1 to 5, wherein the valve body has an extension groove whose volume expands in the deep portion of the guide groove.   The fuel injection device according to any one of claims 1 to 10, wherein the valve body has a plurality of the guide grooves per one nozzle hole.

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