JP2018048573A - Fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of reducing the flow resistance of fuel when injected from an injection hole made in a plate material.SOLUTION: A plate material 51 of a fuel injection valve 11 has a first region 55a having a first cut surface 58 intersecting with the surface of the plate material 51 via a first line 57 drawn on the surface of the plate material 51 to join two points 57a, 57b, and a swollen region 55b having a second cut surface 61 intersecting with the surface of the plate material 51 via a second line 59 joining two points 57a, 57b at a position where it is farther from a valve hole 23 than the first line 57 and curving so as to be far from the valve hole 23 to form a jet passage 56 defining an injection hole 53 between the first line 57 and the second cut surface 61 and having a bottom face 56a gradually swollen toward the injection hole 53.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fuel injection valve used, for example, in a fuel supply system of an internal combustion engine.

  Patent Document 1 discloses a fuel injection valve. The fuel injection valve has a valve hole connected to the fuel passage. When the valve body is seated on the valve seat, the valve hole is closed. When the valve body leaves the valve seat, the valve hole is opened. A fuel chamber is connected to the valve hole downstream of the valve seat. The plate material facing the fuel chamber has a nozzle hole.

JP 2010-236392 A German Patent Application Publication No. 102007056556 German Patent Application Publication No. 102005000617

  In Patent Document 1, a through hole is formed as a nozzle hole in a plate material. The direction of spraying is adjusted according to the processing angle. However, there is a limit to the processing angle and processing depth, and sufficient spray directivity cannot always be ensured. As disclosed in Patent Document 2 and Patent Document 3, even if an injection hole is formed in a part of a plate member sandwiched between two parallel cut lines, fuel is injected from a direction perpendicular to the injection direction. Therefore, the flow resistance is large and the flow velocity is low.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a fuel injection valve capable of reducing flow resistance when fuel is injected from an injection hole formed in a plate material.

  According to the first aspect of the present invention, there is provided a valve seat member having a valve hole connected to the fuel passage, defining a valve seat surrounding the valve hole, and a seat seated on the valve seat to close the valve hole. A valve body that is displaced to a first position and a second position that opens the valve hole away from the valve seat; and a plate member that is coupled to the valve seat member and faces the valve hole downstream of the valve seat. The plate member includes a first region having a first cut surface that intersects the surface of the plate member at a first line drawn so as to connect two points on the surface of the plate member, and from the valve hole than the first line. A second cut surface that intersects the surface of the plate member at a second line connecting two points at a distance away from the valve hole and curves away from the valve hole, and is injected between the first line and the second cut surface. And a second region that forms a jet passage having a bottom surface that divides the hole and gradually expands toward the nozzle hole. Events are provided.

  According to the second aspect, there is a valve seat member having a valve hole connected to the fuel passage, defining a valve seat surrounding the valve hole, and a first position seated on the valve seat and closing the valve hole, And a valve body that is displaced to a second position that opens the valve hole away from the valve seat, a plate member that is coupled to the valve seat member and faces the valve hole downstream of the valve seat, and a plate member There is provided a fuel injection valve including an injection hole formed with a contour including a line segment, and a flat plate piece bent toward the outside of the fuel chamber along the line segment and having a shape corresponding to the contour.

  According to the third aspect, there is a valve seat member having a valve hole connected to the fuel passage and defining a valve seat surrounding the valve hole; a first position seated on the valve seat and closing the valve hole; And a valve body that is displaced from the valve seat to a second position that opens the valve hole, and a plate member that is coupled to the valve seat member and faces the valve hole downstream of the valve seat, The plate material has a first region having a first cut surface intersecting the surface of the plate material at a first line drawn so as to connect two points on the surface of the plate material, and a position farther from the valve hole than the first line. A second line connecting the two points at a second line that intersects the surface of the plate and bends away from the valve hole, and divides the injection hole between the first line and the second cut surface. An ejection passage having a flat bottom surface extending in a constant cross section toward the nozzle hole and parallel to the surface of the plate member is formed. A fuel injection valve and a second region are provided.

  According to the first aspect, when the valve body leaves the valve seat and opens the valve hole, the fuel flows into the gradually expanding jet passage. The fuel is guided through the ejection passage and injected from the injection hole. Since the jet passage gradually expands toward the nozzle hole, the flow resistance is small, a high flow velocity is secured, and fuel atomization is realized.

  According to the second aspect, when the valve body leaves the valve seat and opens the valve hole, the fuel flows toward the nozzle hole. Fuel is injected from the nozzle hole. Since the flat plate piece exists continuously from the edge of the nozzle hole, the flat plate piece serves as a shielding wall and can control the fuel injection direction.

  According to the third aspect, when the valve body leaves the valve seat and opens the valve hole, the fuel flows into the ejection passage having a constant cross section. The fuel is guided through the ejection passage and injected from the injection hole. The fuel is atomized by colliding with the bottom surface of the ejection passage and being injected.

1 is a vertical sectional view schematically showing a configuration of a fuel injection valve according to an embodiment of the present invention. (A) An enlarged partial vertical sectional view of the tip of a fuel injection valve, and (b) An enlarged perspective view of an injection hole. (A) The figure which shows schematically the manufacturing method of an injector plate, (b) It is a conceptual diagram which shows roughly an alternative punch and a lower mold | type. (A) An enlarged partial perspective view of an injector plate according to a second embodiment of the present invention, (b) a conceptual diagram at the time of manufacture, (c) an enlarged partial perspective view of an injector plate according to a third embodiment of the present invention, and (D) It is an expansion vertical sectional view of the injector plate which concerns on 4th Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows the overall configuration of a fuel injection valve 11 according to a first embodiment of the present invention. The fuel injection valve 11 includes a casing 12. The casing 12 includes a first cylindrical member 14 that defines the hollow space 13 and a fuel passage 15 that is liquid-tightly coupled to the front end of the first cylindrical member 14 and connected to the hollow space 13 of the first cylindrical member 14. And a second cylindrical member 18 that is liquid-tightly coupled with an annular spacer 17 between the rear end of the first cylindrical member 14. The annular spacer 17 is formed of a nonmagnetic metal material such as stainless steel and is welded to the first cylindrical member 14 and the second cylindrical member 18 around the entire circumference around the central axis CL.

  A valve body 19 is disposed in the fuel passage 15 of the valve seat member 16. The valve body 19 has a seating surface 21 formed of a partial spherical surface. The seating surface 21 faces the valve seat 22 at the front end of the fuel passage 15. The valve seat 22 is partitioned into a valve seat member 16. The valve seat 22 surrounds the valve hole 23. The valve hole 23 is connected to the fuel passage 15. The valve body 19 is displaced to a first position where the valve body 19 is seated on the valve seat 22 and closes the valve hole 23 and to a second position where the valve body 23 is opened away from the valve seat 23.

  The fuel passage 15 defines a cylindrical space having a uniform diameter. The valve body 19 includes two journal portions 24 disposed in the cylindrical space of the fuel passage 15. The journal portion 24 is guided to the cylindrical space of the fuel passage 15 so as to be slidable in the axial direction. The journal part 24 guides the axial movement of the valve body 19. Each journal portion 24 is divided into a plurality of chamfered portions 25 that allow fuel to flow in the axial direction.

  A stopper plate 26 is sandwiched between the first cylindrical member 14 and the valve seat member 16. The stopper plate 26 is fixed to the casing 12 so as not to be relatively displaced in the axial direction. A flange 27 facing the stopper plate 26 is formed in the valve body 19 in the fuel passage 15. When the valve body 19 is retracted, the flange 27 abuts against the stopper plate 26 to define the retreat limit of the valve body 19. The stopper plate 26 divides the fuel passage 15 and the hollow space 13 of the first cylindrical member 14 around the opening 26 a while receiving the valve body 19 through the opening 26 a coaxial with the valve body 19.

  A movable core 28 is fixed to the rear end of the valve body 19 in the hollow space 13 of the first cylindrical member 14. The movable core 28 is slidably accommodated in the first cylindrical member 14. The movable core 28 is displaced in the axial direction together with the valve body 19.

  A coil assembly 31 is mounted on the outer periphery of the second cylindrical member 18 in a region adjacent to the annular spacer 17. The coil assembly 31 includes a bobbin 32 that is fitted to the outer periphery of the annular spacer 17 and the second cylindrical member 18, and a coil 33 that is wound around the bobbin 32. The second cylindrical member 18 functions as a fixed core inside the coil 33. The coil assembly 31 is surrounded by a coil housing 34. One end of the coil housing 34 is joined to the outer peripheral surface of the first cylindrical member 14 by welding. When a current flows through the coil 34, the movable core 28 is drawn toward the fixed core (second cylindrical member 18). That is, the coil assembly 31 exhibits a driving force for pulling the valve element 19 away from the valve seat 22.

  The second cylindrical member 18 defines an axial inner space 35 coaxially with the valve body 19. The inner space 35 is connected to the hollow space 13 of the first cylindrical member 14. A valve spring 36 connected to the movable core 28 is disposed in the inner space 35. The valve spring 36 is constituted by a coil spring, for example. The valve spring 36 exerts an elastic force in the seating direction of the valve body 19, that is, the direction in which the valve body 19 is advanced toward the valve seat 22. A pipe-like retainer 37 is connected to the rear end of the valve spring 36. The retainer 37 is fitted into the inner space 35 and fixed. The set load of the valve spring 36 is adjusted according to the position of the retainer 37 in the axial direction.

  At the rear end of the second cylindrical member 18, an inlet cylinder 38 that defines a fuel inlet 38 a is defined. The rear end of the retainer 37 opens into the space of the inlet cylinder 38. A fuel filter 39 is attached to the fuel inlet 38a. High pressure fuel is supplied to the fuel inlet 38a from a fuel pump (not shown).

  The fuel injection valve 11 includes a resin molded body 41. The resin molded body 41 encloses the first cylindrical member 14, the annular spacer 17, the second cylindrical member 18, the coil assembly 31, and the coil housing 34. A coupler 42 is molded on the resin molded body 41. The coupler 42 accommodates a connection terminal 43 connected to the coil 33. A control signal is supplied to the coil 33 from the connection terminal 43. A magnetic force is generated in the coil 33 in response to the supply of the control signal.

  A cap 44 made of synthetic resin is attached to the front end of the casing 12. A seal holder 45 is attached to the outer periphery of the casing 12 behind the cap 44. An O-ring 46 that is in close contact with the outer periphery of the casing 12 is sandwiched between the cap 44 and the seal holder 45. When the front end of the casing 12 is fitted into the mounting hole 47 of the intake manifold M, the O-ring 46 is in close contact with the inner periphery of the mounting hole 47. The intake manifold M is joined to the cylinder head of the engine. For example, two intake ports that communicate with the cylinder are formed in the cylinder head. The intake passage 48 of the intake manifold M is connected to the intake port. The intake port opens into the combustion chamber. The opening of the intake port is opened and closed by an intake valve. The fuel injected through the intake passage 48 of the intake manifold M is introduced into the cylinder as an air-fuel mixture according to the opening and closing of the intake valve. Thus, the fuel injection valve 11 is attached to the engine.

  As shown in FIG. 2A, an injector plate (plate material) 51 is fixed to the valve seat member 16. The injector plate 51 is welded to the valve seat member 16 over the entire circumference around the central axis CL of the valve body 19 and is coupled to the valve seat member 16 in a fluid-tight manner. The injector plate 51 is opposed to the valve hole 23. Here, the injector plate 51 partitions the fuel chamber 52 between the downstream end of the valve seat 22 and the front end face of the valve seat member 16. Thus, the fuel chamber 52 is connected to the valve hole 23. One side of the injector plate 51 faces the fuel chamber 52.

  A nozzle hole 53 is defined in the injector plate 51. A plate region (first region) 55 a and a bulging region (second region) 55 b are formed in the injector plate 51 when the injection hole 53 is partitioned. The bulging area 55 b bulges outward from the fuel chamber 52, and forms an ejection passage 56 between the bulging area 55 b and the fuel chamber 52. Here, the plate region 55a has a flat plate shape. The injector plate 51 may be formed from, for example, a steel plate.

  As shown in FIG. 2B, the plate region 55 a is a first line that intersects the plate surface of the injector plate 51 at a first line 57 drawn so as to connect two points 57 a and 57 b on the plate surface of the injector plate 51. A cut surface 58 is provided. Here, the first cut surface 58 is orthogonal to the plate surface of the injector plate 51. The bulging area 55b is curved so as to cross the plate surface of the injector plate 51 at a second line 59 connecting the two points 57a and 57b at a position farther from the valve hole 23 than the first line 57 and away from the valve hole 23. A second cut surface 61 is provided. The bulging area 55 b forms an ejection passage 56 having a bottom surface 56 a that divides the injection hole 53 between the first line 57 and the second cut surface 61 and gradually expands toward the injection hole 53. Here, the first line 57 is composed of a line segment. At this time, the second line 59 may be a curve connecting two points that are different from the two points 57 a and 57 b described above and set in the plate surface in a virtual plane parallel to the first cut surface 58.

  Next, the operation of the fuel injection valve 11 according to this embodiment will be described. When the fuel pump of the fuel supply system is activated, high-pressure fuel is introduced into the fuel injection valve 11 from the fuel inlet 38a. The fuel flows into the fuel passage 15 through the retainer 37, the valve spring 36, the hollow space 13 of the first cylindrical member 14, and the opening 26a of the stopper plate 26. At this time, if no control signal is supplied to the coil 33, no magnetic force is generated by the coil 33, and the valve body 19 is pressed against the valve seat 22 by the elastic force of the valve spring 36. The valve hole 23 is closed by the valve body 19. The fuel remains in the fuel passage 15.

  When a control signal is supplied to the coil 33 and a magnetic force is generated by the coil 33, the movable core 28 is attracted to the fixed core of the second cylindrical member 18. The valve body 19 is separated from the valve seat 22. The valve hole 23 is opened. The fuel flows from the fuel passage 15 into the fuel chamber 52 through the valve hole 23. When the pressure is sufficiently increased in the fuel chamber 52, the fuel in the fuel chamber 52 is injected into the intake passage 48 of the intake manifold M from the injection hole 53. Thus, an air-fuel mixture is formed in the intake passage 48.

  When the valve body 19 leaves the valve seat 22 and opens the valve hole 23, the fuel flows into the fuel chamber 52. The fuel is guided through the ejection passage 56 that gradually expands away from the fuel chamber 52 and is injected from the injection hole 53. Since the jet passage 56 gradually expands toward the nozzle hole 53, the flow resistance is small, a high flow rate is ensured, and fuel atomization is realized.

  Next, a method for manufacturing the injector plate 51 will be described. A press machine is used to manufacture the injector plate 51. A slit punch is set in the press. As shown in FIG. 3A, the slit punch 63 may be a thin plate having a square outline, for example. A groove 65 is formed in the lower mold 64 in accordance with the slit punch 63. A steel plate material having a circular outline is superimposed on the plane of the lower mold 64. When the slit punch 63 descends and enters the groove 65 of the lower mold 64, a slit is formed in the steel plate material.

  Subsequently, as shown in FIG. 3B, the punch 66 for forming the nozzle holes is set in the press machine. The punch 66 has a vertical surface 67 that extends along the virtual plane VP, and a curved surface 68 that has a center line CC orthogonal to the vertical surface 67 and expands downward. The curved surface 68 is formed following the shape of the ejection passage 56 inside the bulging area 55b. A recess 71 is formed in the lower die 69 in accordance with the tip of the punch 66. A steel plate material 73 with slits 72 is superimposed on the plane of the lower die 69. The steel plate material 73 is divided into a plate region 55a having a first cut surface 58 and a planned deformation region 75 having a cut surface 74 facing the first cut surface 58 with the slit 72 as a boundary. For example, the first cut surface 58 is aligned with the vertical surface 71 a of the recess 71. The planned deformation area 75 overlaps the depression 71 of the lower mold 69.

  The punch 66 descends in the vertical direction toward the lower die 69. At this time, the vertical surface 67 of the punch 66 moves within the virtual plane VP including the first cutting surface 58. When the punch 66 enters the recess 71 of the lower die 69, the planned deformation area 75 of the steel plate material 73 is pressed against the recess 71 by the action of the punch 66. In this way, the bulging area 55 b is formed in the steel plate material 73. Thus, the injector plate 51 is manufactured.

  As shown in FIG. 3C, the slit punch and the nozzle for forming the injection hole may be integrated into a single punch 76 when the injector plate 51 is manufactured. The punch 76 only needs to include a flat plate piece 78 extending along a virtual plane below the curved surface 77. As shown in FIG. 3D, a recess 81 is formed in the lower die 79 in accordance with the punch 76. A plate-shaped space 82 is partitioned continuously from the vertical surface 81 a of the recess 81. According to such a punch 76, the slits and the bulging area 55b are formed one after another as the punch 76 is lowered once. The production efficiency of the injector plate 51 is increased.

  FIG. 4A schematically shows the configuration of an injector plate 51a according to the second embodiment of the present invention. The injector plate 51 a has a nozzle hole 84 formed with a contour including a line segment 83. A flat plate 85 continues to the inner wall of the nozzle hole 84. The flat plate piece 85 is bent toward the outside of the fuel chamber 52 along a line segment 83 and has a shape corresponding to the outline of the injection hole 84. According to such an injector plate 51a, since the flat plate piece 85 exists continuously from the edge of the injection hole, the flat plate piece 85 serves as a shielding wall and can control the fuel injection direction as desired. As shown in FIG. 4B, in manufacturing the injector plate 51a, the steel plate material is a quadrangle including a line segment 83 on one side, and slits 86a, 86b, 86c are formed on the remaining three sides. When the insides of the slits 86a, 86b, 86c are pushed by the columnar punch 87 having a square cross section, the injector plate 51a is manufactured. In the fuel injection valve 11, an injector plate 51 a may be used instead of the injector plate 51.

  FIG. 4C schematically shows the configuration of an injector plate 51b according to the third embodiment of the present invention. A nozzle hole 88 is defined in the injector plate 51b. A plate region (first region) 89a and a bulging region (second region) 89b are formed in the injector plate 51b when the injection hole 88 is partitioned. The bulging area 89 b bulges outward from the fuel chamber 52 and forms an ejection passage 91 between itself and the fuel chamber 52. Here, the plate region 89a has a flat plate shape. The injector plate 51b may be formed from, for example, a steel plate.

  The plate area 89a has a first cut surface 93 that intersects the plate surface of the injector plate 51b at a first line 92 drawn so as to connect the two points 92a and 92b on the plate surface of the injector plate 51b. Here, the first cut surface 93 is orthogonal to the plate surface of the injector plate 51b. The bulging area 89b is bent so that it crosses the plate surface of the injector plate 51b at a second line 94 connecting the two points 92a and 92b at a position farther from the valve hole 23 than the first line 92 and away from the valve hole 23. Two cut surfaces 95 are provided. The bulging area 89 b defines an ejection passage 91 that divides the injection hole 88 between the first line 92 and the second cut surface 95 and extends in a constant cross section toward the injection hole 88. Here, the first line 92 is composed of a line segment. The second cut surface 95 defines an injection hole 88 between the first line 92 and an upper edge 95 a of a line segment extending in parallel with the first line 92. A flat bottom surface 91a extending in parallel with the plate surface of the plate region 89a is formed in the bulging region 89b. In the present embodiment, when the valve body 19 moves away from the valve seat 22 and opens the valve hole 23, the fuel flows into the ejection passage 91 having a certain cross section. The injected fuel collides with the bottom surface 91a and is injected, so that atomization of the fuel is realized.

  FIG. 4 (d) schematically shows the configuration of an injector plate 51c according to a fourth embodiment of the present invention. A nozzle hole 97 is defined in the injector plate 51c. A first bulging area (first area) 98a and a second bulging area 98b are established in the injector plate 51c when the injection hole 97 is partitioned. The first bulging area 98 a bulges outward from the fuel chamber 52, and forms a first ejection passage 101 with the fuel chamber 52. Similarly, the second bulging area 98 b is larger than the first bulging area 98 a and bulges outward from the fuel chamber 52, and forms a second ejection passage 102 between the second bulging area 98 b and the fuel chamber 52. Here, the first bulging area 98a is curved so as to intersect the plate surface of the injector plate 51c and move away from the fuel chamber 52 at a first line 103 drawn so as to connect two points with the plate surface bulging downward. A cut surface 104 is provided. The first bulging area 98 a gradually increases the amount of bulging toward the first cut surface 104. The second bulging area 98b intersects the plate surface of the injector plate 51c at the second line 105 drawn so as to connect the two points with the plate surface bulging downward at a position further shifted outward from the first cut surface 104. A second cut surface 106 is provided. The second bulging area 98b gradually increases the amount of bulging toward the second cut surface 106. The nozzle hole 97 is defined between the first line 103 and the second cut surface 106. Since the fuel flowing through the first ejection passage 101 collides with the fuel flowing through the second ejection passage 102, atomization can be realized. At this time, the second line 105 may be a curve connecting two points set in the plate plane within a virtual plane that is different from the above-described two points and is parallel to the first cut surface 104.

  In addition, although each structure drawn on drawing is drawn exaggerating size etc. for an understanding, it does not limit an actual dimension. Moreover, what is necessary is just to set suitably also about the size and arrangement | positioning of a nozzle hole, and it is not limited to what was described in the specification and drawing.

  DESCRIPTION OF SYMBOLS 11 ... Combustion injection valve, 15 ... Fuel passage, 16 ... Valve seat member, 19 ... Valve body, 22 ... Valve seat, 23 ... Valve hole, 51 ... Plate material (injector plate), 51a ... Plate material (injector plate), 51b ... Plate material (injector plate), 51c ... Plate material (injector plate), 52 ... Fuel chamber, 53 ... Injection hole, 55a ... First region (plate region), 55b ... Second region (bulge region), 56 ... Jet passage, 56a ... bottom surface, 57 ... first line, 57a ... dot, 57b ... dot, 58 ... first cut surface, 59 ... second line, 61 ... second cut surface, 83 ... line segment, 84 ... nozzle hole, 85 ... Plate piece 88 ... Injection hole 89a ... 1st area | region (plate area | region), 89b ... 2nd area | region (expansion area | region), 91 ... Ejection passage, 91a ... Bottom face, 92 ... 1st line, 92a ... Point, 92b ... Point, 93 ... first cut surface, 94 ... second line, 95 ... second cut surface 97 ... Injection hole, 98a ... 1st area | region (1st bulging area), 98b ... 2nd area | region (2nd bulging area), 102 ... Ejection path (2nd ejection path), 103 ... 1st line, 104 ... First cut surface, 105 ... second line, 106 ... second cut surface.

Claims (3)

A valve seat member (16) having a valve hole (23) connected to the fuel passage (15) and defining a valve seat (22) surrounding the valve hole (23);
A valve body that is displaced to a first position that sits on the valve seat (22) and closes the valve hole (23), and a second position that leaves the valve seat (22) and opens the valve hole (23). (19)
A plate member (51, 51c) coupled to the valve seat member (16) and facing the valve hole (23) downstream of the valve seat (22);
The plate (51, 51c)
A first cut surface (58) intersecting the surface of the plate (51, 51c) at a first line (57, 103) drawn to connect two points (57a, 57b) on the surface of the plate (51, 51c). 104), a first region (55a, 98a),
Crosses the surface of the plate (51, 51c) at a second line (59, 105) connecting two points (57a, 57b) at a position farther from the valve hole (23) than the first line (57, 103). And has a second cut surface (61, 106) that curves away from the valve hole (23), and is injected between the first line (57, 103) and the second cut surface (61, 106). A second region (55b, 98b) that forms a jet passage (56, 102) having a bottom surface (56a) that divides the hole (53, 97) and gradually expands toward the nozzle hole (53, 97);
A fuel injection valve characterized by comprising: A valve seat member (16) having a valve hole (23) connected to the fuel passage (15) and defining a valve seat (22) surrounding the valve hole (23);
A valve body that is displaced to a first position that sits on the valve seat (22) and closes the valve hole (23), and a second position that leaves the valve seat (22) and opens the valve hole (23). (19)
A plate member (51a) coupled to the valve seat member (16) and facing the valve hole (23) downstream of the valve seat (22);
A nozzle hole (84) formed in a contour including a line segment (83) in the plate material (51a),
A fuel injection valve comprising: a flat plate piece (85) bent toward the outside of the fuel chamber (52) at the line segment (83) and having a shape corresponding to the contour. A valve seat member (16) having a valve hole (23) connected to the fuel passage (15) and defining a valve seat (22) surrounding the valve hole (23);
A valve body that is displaced to a first position that sits on the valve seat (22) and closes the valve hole (23), and a second position that leaves the valve seat (22) and opens the valve hole (23). (19)
A plate member (51b) coupled to the valve seat member (16) and facing the valve hole (23) downstream of the valve seat (22);
The plate (51b)
A first region having a first cut surface (93) intersecting the surface of the plate material (51b) at a first line (92) drawn so as to connect two points (92a, 92b) on the surface of the plate material (51b). (89a)
A second line (94) connecting two points (92a, 92b) at a position farther from the valve hole (23) than the first line (92) intersects the surface of the plate member (51b) and crosses the valve hole (23 A second cut surface (95) that bends away from the first cut line (95), and divides an injection hole (88) between the first line (92) and the second cut surface (95). A second region (89b) that forms a jet passage (91) having a flat bottom surface (91a) extending in a constant cross section toward the surface and parallel to the surface of the plate (51b);
A fuel injection valve characterized by comprising:

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