JP2004060592A - Injection device, injection hole member manufacturing device, and injection hole member manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection device having an injection hole member in which only an injection amount is regulated without changing an injection direction. <P>SOLUTION: Injection holes 22 are formed in the flat plate part 21 of the injection hole member 20. The injection hole diameters of the injection holes are identical to each other, and gradually diverged from an inlet side toward an outlet side. In a virtual plane including injection hole axes 110 and orthogonal to the flat plate part 21, the inner wall surface 23 of the flat plate part forming the injection holes 22 and the virtual flat surface cross two injection hole crossing lines 114 and 116. The virtual flat surface and a fuel inlet side end face 24 forming the fluid inlet side end face of the flat plate part 21 cross two inlet crossing lines 120 and 122. An angle α formed by the injection hole crossing line 114 and the inlet crossing line 120 is an acute angle, and an angle β formed by the injection hole crossing line 116 and the inlet crossing line 122 is an acute angle. A recessed part 26 includes the inlet opening peripheral edges of the injection holes 22 on the inlet peripheral angle α side of the injection holes 22 in the flat plate part 21 and formed by press working. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an injection device in which an injection hole for injecting a fluid is formed in an injection hole member (hereinafter, the “injection device” is referred to as an injector), an apparatus for manufacturing the injection hole member, and a method for manufacturing the injection hole member.
[0002]
[Prior art]
By forming an injection hole in a thin plate injection hole member and adjusting the injection hole diameter or the inclination angle of the injection hole, the injection amount injected from the injection hole, that is, the fluid flow rate and the injection direction flowing through the injection hole, is adjusted with high precision A known injector is known. However, the injection amount may vary due to a processing error at the time of the injection hole processing, a variation in the plate thickness of the injection hole member, a dull fluid inlet angle of the injection hole, and the like. Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. H11-270441, it has been considered to form the injection hole member by adjusting the injection amount by recessing the base material at the inlet edge of the injection hole. . Since the material of the base material is extruded toward the injection hole by denting the base material at the inlet peripheral portion of the injection hole, the blunt amount of the fluid inlet angle and the injection hole diameter in the injection hole can be adjusted. Therefore, the injection amount of the injection hole can be adjusted.
[0003]
[Problems to be solved by the invention]
The present applicant has studied a so-called tapered injection hole in which the injection hole axis along the direction of fluid flow flowing through the injection hole is inclined with respect to the axis along the plate thickness direction of the injection hole member. However, when a recess is formed in the inlet peripheral edge of the tapered injection hole to adjust the injection amount, the injection amount changes and the injection direction changes depending on the position where the base material of the injection hole entrance peripheral portion is recessed. There is.
[0004]
An object of the present invention is to provide an injector including an injection hole member in which only the injection amount is adjusted without changing the injection direction.
Another object of the present invention is to provide an apparatus for manufacturing an injection hole member in which a variation in punch force transmitted to a base material is small.
It is another object of the present invention to provide a method of manufacturing an injection hole member that manufactures an injection hole member by adjusting only an injection amount without changing an injection direction.
[0005]
[Means for Solving the Problems]
According to the method for manufacturing an injector according to claim 1 of the present invention or the injection hole member according to claim 7, a virtual plane including the injection hole axis of the injection hole and orthogonal to the injection hole member of the injection hole member has a structure in which One of the two injection hole intersection lines where the wall surface and the virtual plane intersect forms an acute angle with the fluid inlet side end surface of the injection hole member, and the other of the injection hole intersection lines forms an obtuse angle with the fluid inlet side end surface.
[0006]
The fluid flowing through the nozzle hole on the side where the nozzle line intersection line and the fluid inlet side end face form an acute angle separates from the inner wall surface of the nozzle hole and flows, so press processing is performed on the acute angle side of the inlet peripheral edge of the nozzle hole. Therefore, even if the material of the injection hole member moves toward the injection hole side and the inner wall surface of the injection hole is deformed, the injection direction hardly changes. On the other hand, the fluid flowing through the nozzle hole on the side where the nozzle hole intersection line and the fluid inlet side end surface form an obtuse angle flows along the inner wall surface of the nozzle hole. Therefore, when the material of the injection hole member moves to the injection hole side by forming the concave portion by press working and the shape of the inner wall surface on the obtuse angle side of the injection hole changes, the fluid injection amount changes and the fluid injection direction changes. .
In the injector according to the first aspect of the present invention, since the concave portion is formed by press working on the side where the injection hole intersection line and the fluid inlet side end surface form an acute angle, the amount of processing of the concave portion by pressing is adjusted. In addition, only the injection amount can be adjusted without changing the injection direction.
[0007]
According to the injector according to the second aspect of the present invention, the injection hole intersection line includes a range of 75% or less of the length of the inlet diameter of the injection hole from the side where the injection port intersection line and the fluid inlet side end face form an acute angle. A concave portion is formed at the inlet peripheral edge of the injection hole on the side where the fluid inlet side end surface forms an acute angle with the fluid inlet side end surface. Since the range in which the concave portion is formed from the acute angle side to the obtuse angle side at the inlet peripheral portion of the injection hole is regulated, deformation of the inner wall surface of the injection hole on the obtuse angle side can be reduced. Therefore, a change in the injection direction can be prevented.
[0008]
According to the injector according to the third aspect of the present invention, since the recess is formed including the periphery of the opening of the injection hole on the inlet side, the inlet opening area of the injection hole hardly changes even if the formation position of the recess is shifted. Therefore, it is possible to prevent the injection amount from being varied due to the difference in the formation position of the concave portion.
According to the injector according to the fourth aspect of the present invention, a concave portion is formed at the inlet peripheral edge of at least one or more injection holes. If a recess is formed at the entrance periphery of some of the injection holes without forming a recess at the entrance periphery of all the injection holes, the change in the injection amount is small if the depression amount of the same depression is small. Can be fine-tuned. Further, the injection amount can be finely adjusted by adjusting the number of injection holes forming the concave portion.
[0009]
According to the injection hole member manufacturing apparatus according to the fifth aspect of the present invention, since the pressing force is applied from the transmission member to the punch via the elastic member, the punch presses the base material even if the thickness of the base material varies. The fluctuation of the applied force can be reduced. Therefore, even if the thickness of the base material varies, the processing amount of the concave portion can be made constant.
According to the manufacturing apparatus for manufacturing an injection hole member according to claim 6 of the present invention, the lower end position of the transmission member toward the base material can be adjusted, so that the force with which the punch presses the base material can be finely adjusted. Therefore, the processing amount of the concave portion can be adjusted with high accuracy.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a plurality of examples showing an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 2 shows an injector according to a first embodiment of the present invention. The injector 10 is a fuel injection device for a gasoline engine.
The valve body 12 is fixed to the inner wall of the fuel injection side end of the valve housing 16 by welding. The valve body 12 has a conical surface 13 as an inner peripheral surface that forms a fuel passage 100 by reducing the diameter toward the injection hole member 20 side in the fuel flow direction. A valve seat 14 on which a nozzle needle 30 as a valve member can be seated is formed on the conical surface 13.
[0011]
The injection hole member 20 is formed in a cylindrical shape with a bottom, and is sandwiched between a bottom inner wall of the valve housing 16 and a bottom outer wall of the valve body 12. As shown in FIG. 1A, a total of twelve injection holes 22 are formed in the flat plate portion 21 of the injection hole member 20. As shown in FIG. 1B, the diameters of the injection holes 22 are the same, and the diameters of the injection holes 22 gradually increase from the inlet side to the outlet side. The injection hole axis 110 along the direction of flow of the fuel flowing through the injection hole 22 is inclined with respect to the axis 112 along the thickness direction of the flat plate portion 21 which is the bottom of the injection hole member 20. When the nozzle needle 30 shown in FIG. 2 is seated on the valve seat 14, fuel injection from the injection hole 22 is shut off, and when the nozzle needle 30 separates from the valve seat 14, fuel injection from the injection hole 22 is permitted and fuel is injected. You.
[0012]
2 is inserted into the inner peripheral wall of the valve housing 16 on the side opposite to the injection hole, and is fixed to the valve housing 16 by welding. The cylindrical member 40 includes a first magnetic cylindrical portion 42, a non-magnetic cylindrical portion 44, and a second magnetic cylindrical portion 46 from the injection hole member 20 side. The non-magnetic cylinder 44 prevents a magnetic short circuit between the first magnetic cylinder 42 and the second magnetic cylinder 46.
[0013]
The movable core 50 is formed of a magnetic material in a cylindrical shape, and is fixed to the end 34 of the nozzle needle 30 on the side opposite to the injection hole by welding. The movable core 50 reciprocates with the nozzle needle 30. The outflow hole 52 penetrating through the cylinder wall of the movable core 50 forms a fuel passage communicating inside and outside the cylinder of the movable core 50.
The fixed core 54 is formed of a magnetic material into a cylindrical shape. The fixed core 54 is inserted into the tubular member 40 and is fixed to the tubular member 40 by welding. The fixed core 54 is provided on the side opposite to the injection hole with respect to the movable core 50 and faces the movable core 50.
[0014]
The adjusting pipe 56 is pressed into the fixed core 54 to form a fuel passage therein. The spring 58 is locked at one end to the adjusting pipe 56 and at the other end to the movable core 50. The load of the spring 58 applied to the movable core 50 can be changed by adjusting the amount of press-fit of the adjusting pipe 56. The movable core 50 and the nozzle needle 30 are urged toward the valve seat 14 by the urging force of the spring 58.
[0015]
The coil 60 is wound around a spool 62. The terminal 65 is insert-molded in the connector 64 and is electrically connected to the coil 60. When the coil 60 is energized, a magnetic attractive force acts between the movable core 50 and the fixed core 54, and the movable core 50 is attracted to the fixed core 54 against the urging force of the spring 58.
[0016]
The filter 70 is installed on the fuel upstream side of the fixed core 54 and removes foreign matter in the fuel supplied to the injector 10. The fuel that has flowed into the fixed core 54 through the filter 70 passes through the fuel passage in the adjusting pipe 56, the fuel passage in the movable core 50, the outflow hole 52, between the inner peripheral wall of the valve housing 16 and the outer peripheral wall of the nozzle needle 30. Sequentially. When the nozzle needle 30 separates from the valve seat 14, fuel passes through an open flow path formed between the nozzle needle 30 and the valve seat 14 and is guided to the injection holes 22.
[0017]
Next, the shapes of the injection hole 22 and the inlet peripheral edge of the injection hole 22 will be described in detail.
As shown in FIG. 1B, in a virtual plane including the injection hole axis 110 and orthogonal to the flat plate portion 21, the inner wall surface 23 of the injection hole 22 and the virtual plane are defined by two injection hole intersection lines 114 and 116. Intersect. The virtual plane intersects the fuel inlet side end face 24 which is the fluid inlet side end face of the flat plate portion 21 at two inlet intersection lines 120 and 122. The angle α formed by the injection hole intersection line 114 and the entrance intersection line 120, that is, the injection hole intersection line 114 and the fuel inlet side end face 24 is an acute angle, and the injection hole intersection line 116 and the entrance intersection line 122, that is, the injection hole intersection line The angle β formed by the fuel inlet 116 and the fuel inlet side end face 24 is an obtuse angle. The recess 26 is formed on the flat plate portion 21 on the corner α side of the inlet peripheral edge of the injection hole 22, including the inlet opening peripheral edge of the injection hole 22.
[0018]
As shown in FIG. 3A, the injection holes 22 are formed in advance in the thin plate-shaped base material 130 of the injection hole base material 20. As shown in FIG. 3B, the base material 130 having the injection holes 22 formed therein is pressed by a punch 206 to form a recess including the entrance opening edge of the injection holes 22 at the entrance periphery of the injection holes 22. 26 are formed. The punch 206 has a shape that simultaneously forms the recess 26 in the twelve injection holes 22. Each tip of the punch 206 is a square plane as shown in FIGS. 3B and 3C. The recess 26 includes 75% or less of the inlet diameter d of the injection hole 22 connecting the angle α side and the angle β side from the angle α side, that is, L / d ≦ 0.75, and the injection hole on the angle α side. 22 is formed on the flat plate portion 21 at the periphery of the entrance. After the concave portion 26 is formed at the inlet periphery of the injection hole 22, the injection hole member 20 is formed in a bottomed cylindrical shape.
[0019]
The concave portion 26 is formed due to a variation in the thickness of the base material 130, a processing error when forming the injection hole 22, or a dullness around the opening of the injection hole when the injection hole 22 is formed by punching with a punch (not shown). The injection amount of the previous injection hole 22 is often different from the desired injection amount. Therefore, in the present embodiment, in the base material 130, the concave portion 26 is formed by pressing using a punch 206 at the entrance peripheral portion of the injection hole 22, so that the material of the base material 130 is moved to the injection hole 22 side and the injection is performed. The entrance opening area of the hole 22 is reduced. By reducing the entrance opening area, the injection amount injected from the injection hole 22 can be adjusted.
[0020]
Next, a manufacturing apparatus for forming the concave portion 26 will be described.
As shown in FIG. 4, the press device 200 reciprocates to transfer members 202 and 204 for transmitting a pressing force from a driving device (not shown) to the punch 206, a support member 208 for pressing the thin plate-shaped base material 130, and a transmission member 204. It has a punch 206 that is supported so as to be supported, and a spring member 210 as an elastic member interposed between the transmission member 202 and the punch 206 and for urging the punch 206 toward the base material 130.
[0021]
In the case where the recess 26 is formed at the inlet peripheral edge of the injection hole 22 of the injector 10 and the injection amount is adjusted as in this embodiment, the processing depth of the recess 26 is about several microns. Therefore, even if the thickness of the base material 130 varies about several microns, a large variation occurs with respect to the predetermined processing depth of the recess 26. Therefore, it is necessary to prevent the processing depth of the concave portion 26 from fluctuating due to variations in the thickness of the base material 130.
[0022]
The pressing force of the driving device of the press device 200 of this embodiment is transmitted from the transmission member 202 to the punch 206 via the spring member 210. Therefore, the amount of movement of the punch 206 is smaller than the amount of movement of the transmission members 202 and 204. Further, the force with which the punch 206 presses the base material 130 changes according to the product of the amount of deformation of the spring member 210 and the elastic coefficient. The pressing force applied by the punch 206 to the base material 130 does not increase rapidly even when the transmission members 202 and 204 are lowered toward the base material 130. Therefore, even if the thickness of the base material 130 varies, the processing depth of the recess 26 by the punch 206 if the lower end positions of the transmission members 202 and 204 toward the base material 130, that is, the bottom dead center of the press is constant. Can be kept constant.
In other words, as shown in FIGS. 4A and 4B, by changing the lower end positions of the transmission members 202 and 204, that is, the bottom dead center of the press, the minute processing depth of the concave portion 26 can be adjusted. It is. Therefore, the injection amount of the injection hole 22 can be adjusted with high accuracy in accordance with the required injection amount.
[0023]
Next, FIG. 5 shows a change in fuel flow when a concave portion is formed on the acute angle side of the inlet peripheral edge of the injection hole 22, when no concave portion is formed, and when a concave portion is formed on the entire periphery. The recess is processed by a press device 200 shown in FIG.
As shown in FIG. 5A, the fuel flowing into the injection hole 22 from the acute angle side of the injection hole 22 separates from the inner wall surface 23 on the acute angle side. Therefore, fuel does not flow along the inner wall surface 23 on the acute angle side. On the other hand, as shown in FIG. 5C, the fuel flowing into the injection hole 22 from the obtuse angle side of the injection hole 22 flows along the inner wall surface 23 on the obtuse angle side.
[0024]
When the concave portion 80 is formed on the entire periphery of the inlet peripheral portion of the injection hole 22 as shown in FIG. 5C, the fuel injection direction becomes obtuse as compared with the case where the concave portion shown in FIG. 5B is not formed. That is, the injection angle decreases. This is because the length of the inner wall surface 23 on the obtuse angle side along the fuel flow direction of the injection hole member 20 forming the injection hole 22 is shortened, so that the fuel flow along the inner wall surface 23 is reduced. . Further, since the concave portion 80 is formed by press working on the entire periphery of the injection hole 22, the material is moved to the inlet side of the injection hole 22 (not shown), and the opening area of the injection hole is reduced. Therefore, the injection amount decreases.
[0025]
In the present embodiment shown in FIG. 5A, even if the concave portion 26 is formed on the acute angle side of the injection hole 22, the length of the inner wall surface 23 on the obtuse angle side along the fuel flow direction does not change. Does not change. Even when the recess 26 is formed on the acute angle side of the injection hole 22 and the length of the inner wall surface 23 on the acute angle side is shortened, the fuel does not flow along the inner wall surface 23 on the acute angle side, so that the injection direction does not change. Regarding the injection amount, since the concave portion 26 is formed on the acute angle side by press working, although not shown, the material moves to the inlet side of the injection hole 22 and the inlet opening area of the injection hole decreases. Therefore, the injection amount decreases.
[0026]
FIG. 6 shows the flow rate adjustment amount and the change in the injection angle when the concave portion 26 is formed only at the acute angle side of the inlet peripheral edge of the injection hole 22 and when the concave portion 80 is formed all around the inlet of the injection hole 22. . The flow rate adjustment amount indicates the percentage of the flow rate that has increased or decreased with respect to the initial flow rate before forming the concave portion in the injection hole 22. A minus value of the flow rate adjustment amount indicates that the flow rate has decreased with respect to the initial flow rate. An increase in the absolute value of the flow rate adjustment amount indicates that the depth of the concave portion is deep.
[0027]
When the concave portion 80 is formed on the entire circumference, the injection angle decreases as the absolute value of the flow rate adjustment amount increases. This is because as the absolute value of the flow rate adjustment amount increases, that is, as the depth of the concave portion 80 increases, the length of the obtuse side of the inner wall surface 23 of the injection hole 22 decreases, and fuel flows along the inner wall surface 23. This is because the length has become shorter.
On the other hand, if the concave portion 26 is formed only on the acute angle side, the injection angle hardly changes even if the absolute value of the flow rate adjustment amount increases. This is because the length of the inner wall surface 23 of the injection hole 22 on the obtuse angle side does not change.
[0028]
The black circles shown in FIG. 7 indicate variations in the injection amount before the concave portion 26 is formed by the punch 206. As described above, the injection amount varies due to a processing error when forming the injection hole 22 or a dullness around the injection hole opening when the injection hole 22 is formed by punching with a punch (not shown). White circles indicate the variation in the injection amount after the injection amount is adjusted by forming the concave portion 26 at the acute angle side of the inlet peripheral portion of the injection hole 22 by the punch 206. By forming the concave portion 26 on the acute angle side, the injection amount can be adjusted substantially uniformly.
[0029]
(Second embodiment)
FIG. 8 shows a second embodiment of the present invention. Components that are substantially the same as those in the first embodiment are denoted by the same reference numerals.
The shape of the concave portion 90 formed on the inlet periphery of the injection hole 22 is different from that of the first embodiment. L / d, which is the ratio of the recess 90 to the inlet diameter d, is smaller than in the first embodiment. By forming the concave portion 90, the effect on the inner wall surface on the angle β side which is an obtuse angle side is small, so that the injection direction does not change.
[0030]
(Third embodiment)
FIG. 9 shows a third embodiment of the present invention. Components that are substantially the same as those in the first embodiment are denoted by the same reference numerals. The injection hole 94 of the third embodiment has the same diameter from the inlet to the outlet.
In the above-described plurality of embodiments of the present invention described above, only the injection amount is adjusted without changing the injection direction by forming a concave portion by press working on the acute angle side of the inlet peripheral edge of the injection hole.
[0031]
In the above embodiments, since the recess is formed at the inlet periphery of the injection hole including the periphery of the inlet opening of the injection hole, even if the formation position of the recess is slightly shifted, the material of the flat plate portion 21 moves to the injection hole side. The amount is almost unchanged. Therefore, even if the formation position of the concave portion is slightly shifted, it is possible to prevent the adjustment amount of the injection amount from varying.
A linear concave portion may be formed at a position slightly apart from the periphery of the inlet opening of the injection hole without including the periphery of the inlet opening of the injection hole.
[0032]
In the above embodiments, the concave portion is formed at the entrance edge of all the injection holes. However, the concave portion may be formed at the entrance edge of at least one or more injection holes. By adjusting the number of injection holes forming the concave portions, the injection amount can be finely adjusted.
In the above embodiments, the injection hole is formed in the flat plate portion 21 of the injection hole member 20, but the injection hole may be formed in a curved plate portion in which the injection hole member is recessed in the injection direction.
[0033]
In the above plurality of embodiments, the injection hole member of the fuel injection device for a gasoline engine has been described. However, as long as the injection amount of the injection hole member having the injection hole in the flat plate portion other than the fuel is adjusted, The manufacturing apparatus or manufacturing method of the present invention can be applied to an injection hole member that ejects a fluid.
[Brief description of the drawings]
FIG. 1A is a plan view of an injection hole member according to a first embodiment as viewed from a fuel inlet side, and FIG. 1B is a plan view of an injection hole member in a cross section including an injection hole axis and orthogonal to the injection hole member. It is sectional drawing which shows a hole periphery.
FIG. 2 is a cross-sectional view showing the injector of the first embodiment.
FIG. 3A is a cross-sectional view showing a base material before forming a recess in an injection hole member, and FIG. 3B is a cross-sectional view showing a state in which a recess is formed in the injection hole member by a punch; (C) is an explanatory view showing the position where the concave portion is formed by the punch.
FIG. 4 is an explanatory view showing a state in which a depression is formed in the base material of the injection hole member by the press device.
FIG. 5A is an explanatory diagram showing a fuel injection state in which a concave portion is formed on the acute angle side of the injection hole, and FIG. 5B is an explanatory diagram showing a fuel injection state in which a concave portion is not formed in the injection hole. (C) is an explanatory view showing a fuel injection state in which a concave portion is formed on the entire circumference of the injection hole.
FIG. 6 is a characteristic diagram showing the relationship between the flow rate adjustment amount and the injection angle when a concave portion is formed on the acute angle side and when a concave portion is formed on the entire circumference.
FIG. 7 is a characteristic diagram showing a relationship between the number of samples and the injection amount before forming a concave portion on the acute angle side and after forming a concave portion on the acute angle side.
FIG. 8A is a plan view of the injection hole member of the second embodiment as viewed from the fuel inlet side, and FIG. 8B is an explanatory diagram showing a position where a concave portion is formed by a punch.
FIG. 9 is a sectional view showing the periphery of an injection hole of an injection hole member according to a third embodiment.
[Explanation of symbols]
10. Injector (injection device)
13 Conical surface (inner surface)
Reference Signs List 20 injection hole member 21 flat plate portion 22, 94 injection hole 23 inner wall surface 24 fuel inlet side end surface (fluid inlet side end surface)
26, 90 recess 30 nozzle needle (valve member)
Reference Signs List 100 fuel passage 110 injection hole axis 112 axis 114, 116 injection hole intersection 130 base material 200 press device 202, 204 transmission member 206 punch 210 spring member (elastic member)

Claims (7)

A valve body having a valve seat on an inner peripheral surface forming a fluid passage;
An injection hole member installed on the downstream side of the fluid flow with respect to the valve seat and forming a plurality of injection holes for injecting the fluid flowing through the fluid passage;
A valve member that shuts off fluid ejection from the injection hole by sitting on the valve seat, and allows fluid ejection from the injection hole by separating from the valve seat,
The injection hole axis along the direction of fluid flow flowing through the injection hole is inclined with respect to the axis along the thickness direction of the injection hole member,
In a virtual plane including the injection hole axis and orthogonal to the injection hole member, one of two injection hole intersection lines at which the inner wall surface of the injection hole and the virtual plane intersect is a fluid inlet side end face of the injection hole member. Forming an acute angle, the other of the injection hole intersection line forms an obtuse angle with the fluid inlet side end face,
The injection device, wherein the injection hole member has a concave portion formed at an inlet periphery of the injection hole on a side where the injection hole intersection line and the fluid inlet side end surface form an acute angle. The nozzle hole member is configured such that the nozzle hole intersection line and the fluid inlet side end face connect the side forming an acute angle and the side forming an obtuse angle with the nozzle hole intersection line and the fluid inlet side. Forming a concave portion at an inlet peripheral portion of the injection hole on the side where the end face forms an acute angle from the side where the acute angle is formed, and the injection hole intersection line and the fluid inlet side end surface form an acute angle. The injection device according to claim 1, wherein: The injection device according to claim 1, wherein the recess is formed to include a peripheral edge of an opening on an inlet side of the injection hole. The injection device according to claim 1, wherein the injection hole member has the concave portion formed at a periphery of an inlet of at least one or more of the injection holes. A manufacturing apparatus for manufacturing an injection hole member of the injection apparatus according to any one of claims 1 to 4,
A punch that forms the concave portion on the fluid inlet side of the thin plate-shaped base material in which the injection hole is formed,
An elastic member for urging the punch toward the base material;
A transmitting member for applying a pressing force toward the base material through the elastic member to the punch,
An apparatus for manufacturing an injection hole member, comprising: The apparatus according to claim 5, wherein a lower end position of the transmission member toward the base material can be adjusted. A method for manufacturing an injection hole member for injecting a fluid from an injection hole formed in the injection hole member,
In a virtual plane including an injection hole axis along the direction of fluid flow flowing through the injection hole and orthogonal to the injection hole member, one of two injection hole intersections at which the inner wall surface of the injection hole intersects the virtual plane is Forming an acute angle with the fluid inlet side end surface of the nozzle hole member, the other of the nozzle hole intersection lines forming an obtuse angle with the fluid inlet side end surface,
A method of manufacturing an injection hole member, comprising: forming a concave portion by pressing on a side of the injection hole member at an inlet peripheral portion of the injection hole where the intersection line of the injection hole and the end surface on the fluid inlet side forms an acute angle. .

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