JP2008121578A - Fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of forming more cavitation bubbles in fuel flowing in the fuel injection valve than former valves. <P>SOLUTION: In the fuel injection valve 1 injecting fuel containing cavitation bubbles formed in a fuel channel 10 from an injection hole 4 through the fuel channel 10 formed between a valve body 2 and a needle 3, a projection part 20 projecting into the fuel channel 10 so as to form a cavitation formation passage 11 having a reduced channel section area of the fuel channel 10 as compared to before and after the same to form cavitation bubbles in fuel is provided on a wall surface 2b of the valve body 2, and the projection part 20 is provided with a retreated part 23 in which a side surface 22 of the projection part 20 provided along the fuel flow in the cavitation formation passage 11 is retreated in a range not to reach a wall surface 2b to expand channel section area of the cavitation formation passage 11 in a downstream of an inlet part of the cavitation formation passage 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel injection valve that injects fuel into an intake passage or a combustion chamber of an internal combustion engine.

  In order to promote atomization of the fuel injected from the fuel injector, bubbles are generated in the fuel flowing through the fuel injector by generating a cavitation phenomenon in the fuel injector, and the fuel containing the bubbles is removed. A fuel injection valve that injects from an injection hole is known. For example, a cavitation generation flow path for generating cavitation bubbles in the fuel flowing through the fuel injection valve, a bubble holding flow path that communicates with the cavitation generation flow path and the nozzle holes, and holds cavitation bubbles generated in the fuel; There is known a fuel injection valve in which the cross-sectional area of the bubble holding flow path is set larger than the cross-sectional area of the cavitation generation flow path (see Patent Document 1). In addition, there are Patent Documents 2 to 4 as prior art documents related to the present invention.

JP 2006-177174 A JP-A-2005-140055 Japanese Patent Application Laid-Open No. 2005-113889 JP 2004-316598 A

  As a method of generating cavitation bubbles in the fuel, a fuel flow path in the fuel injection valve is provided with a portion having a narrow flow passage cross-sectional area and a portion having a wide flow passage cross-sectional area provided downstream thereof, and the flow passage cross-sectional area is narrow. There is a method in which cavitation bubbles are generated at the outlet portion of the cavitation generating flow path by a shearing force generated by a difference in speed between the fuel flowing out from the portion and the fuel staying in a portion having a large flow path cross-sectional area. In addition, a portion having a narrow flow path cross-sectional area is provided in the fuel flow path in the fuel injection valve, and when the fuel flows through this portion, the flow path cross-sectional area is narrow due to a pressure difference generated between the inlet portion and the outlet portion. There is a method of generating cavitation bubbles at the entrance of the part. In the fuel injection valve of Patent Document 1, a convex portion is projected into the fuel flow path in the valve to form a cavitation generation flow path having a narrow flow path cross-sectional area, and the flow velocity of the fuel flowing through the cavitation generation flow path is increased. In order to increase the speed difference between the fuel at the outlet of the cavitation generation flow path, a curved surface, so-called R, is formed at the upstream corner of the convex part, or the flow path cross-sectional area is gradually narrowed along the fuel flow Thus, the amount of cavitation bubbles generated is increased. However, these promote the generation of cavitation bubbles at the outlet portion of the cavitation generation flow path, and the promotion of the generation of cavitation bubbles at the inlet portion of the cavitation generation flow path is not considered.

  Therefore, an object of the present invention is to provide a fuel injection valve capable of generating more cavitation bubbles in the fuel flowing through the fuel injection valve than in the prior art.

  The fuel injection valve of the present invention eliminates cavitation bubbles generated in the fuel flow path via a fuel flow path formed between a valve body and a needle portion provided in the valve body so as to be reciprocally movable. In a fuel injection valve of an internal combustion engine for injecting the contained fuel from an injection hole provided at the tip of the valve body, at least one of the wall surface of the valve body and the wall surface of the needle part forming the fuel flow path The wall surface is formed with a cavitation generation passage in which the flow passage cross-sectional area of the fuel flow passage is reduced compared to before and after the fuel flow direction in order to generate cavitation bubbles in the fuel flowing through the fuel flow passage. Protrusions that protrude into the fuel flow path are provided, and the protrusions generate the cavitation downstream of the inlet portion of the cavitation generation passage. A receding portion is provided in which a side surface of the convex portion provided along the fuel flow of the cavitation generation passage is retreated in a range not reaching the wall surface provided with the convex portion so that a flow passage cross-sectional area of the passage is expanded. Thus, the above-described problem is solved (claim 1).

  According to the fuel injection valve of the present invention, the convex portion is retreated downstream of the inlet portion of the cavitation generation passage to provide the retraction portion, and the flow passage cross-sectional area of the cavitation generation passage is expanded. Separation can occur in the flow and speed differences can occur in the fuel flow. Therefore, a cavitation phenomenon is generated in the fuel flow due to the pressure difference generated at the inlet and outlet of the cavitation generation passage and this separation, and more cavitation bubbles can be generated in the fuel. Further, since the convex part is retreated within a range not reaching the wall surface where the convex part is provided, a speed difference is generated in the fuel flow at the outlet part of the cavitation generation passage, and cavitation bubbles are generated by a shearing force. Can do. As described above, according to the fuel injection valve of the present invention, cavitation bubbles are also generated by the separation of the fuel flow, so that more cavitation bubbles can be generated in the fuel than in the past.

  In one form of the fuel injection valve of the present invention, the side surface of the convex portion provided along the fuel flow in the cavitation generation passage gradually recedes from the inlet portion of the cavitation generation passage toward the wall surface on which the convex portion is provided. (Claim 2). By gradually retreating the convex portion from the inlet portion in this way, it is possible to cause separation of the fuel flow at the inlet portion of the cavitation generation passage and to generate cavitation bubbles in the fuel.

  In one form of the fuel injection valve of the present invention, the convex portion is provided with the convex portion while gradually retreating from an end portion forming the outlet portion of the cavitation generation passage toward the fuel flow upstream side of the fuel flow path. It may be retreated to the wall surface (claim 3). Thus, by retracting the convex portion toward the upstream side of the fuel flow, fuel can be retained in that portion. Therefore, a speed difference can be generated between the fuel staying in that portion and the fuel flowing out from the outlet portion of the cavitation generation passage, and cavitation bubbles can be generated in the fuel by the shearing force.

  In one form of the fuel injection valve of the present invention, an unevenness may be formed in the circumferential direction of the fuel injection valve at an end portion of the convex portion forming the inlet portion of the cavitation generation passage. ). Cavitation bubbles are generated at the end portion of the convex portion forming the inlet portion at the inlet portion of the cavitation generation passage. In this embodiment, since the unevenness is formed at the end portion of the convex portion that forms the inlet portion, the length of the end portion can be increased. Therefore, more cavitation bubbles can be generated in the fuel.

  In one form of the fuel injection valve of the present invention, the convex portion may be provided so as to face both the wall surface of the valve body and the wall surface of the needle portion. In this case, cavitation bubbles can be generated in both the convex portion provided in the valve body and the convex portion provided in the needle portion. Therefore, more cavitation bubbles can be generated in the fuel.

  In one form of the fuel injection valve of the present invention, the flow passage cross-sectional area of the inlet portion of the cavitation generation passage is formed between the seat portion of the valve body and the needle portion at the time of fuel injection of the fuel injection valve. It may be set smaller than the channel cross-sectional area and the channel cross-sectional area of the nozzle hole. By setting the flow path cross-sectional area in this way, it is possible to increase the fuel flow velocity at the inlet portion of the cavitation generation passage, and to more reliably cause separation of the fuel flow.

  In one form of the fuel injection valve of the present invention, downstream of the cavitation generation passage of the fuel flow passage, the flow passage cross-sectional area is larger than the flow passage cross-sectional area of the cavitation generation passage, and in the cavitation generation passage. A cavitation mixing section for mixing the generated cavitation bubbles and the fuel may be provided (claim 7). In this case, since the fuel and the cavitation bubbles are mixed in the cavitation mixing unit, the cavitation bubbles can be dispersed in the fuel. As a result, it is possible to suppress the cavitation bubbles from being biased in the fuel.

  In one form of the fuel injection valve of the present invention, the wall surface of the valve body and the wall surface of the needle portion form a fuel flow path from the exit portion of the cavitation generation passage to the injection hole via the cavitation mixing portion. The portions to be connected may be connected smoothly (claim 8). When fuel containing cavitation bubbles collides with a wall surface such as a valve body in the fuel injection valve, the cavitation bubbles may disappear due to the collision. In this form, since the wall surface of the part from the exit part of a cavitation production | generation channel | path to an injection hole is connected smoothly, extinction of the cavitation bubble by a collision can be suppressed. Therefore, the fuel containing cavitation bubbles can be more reliably injected from the injection hole.

  Another fuel injection valve of the present invention is a cavitation generated in the fuel flow path via a fuel flow path formed between a valve body and a needle portion provided in the valve body so as to be reciprocally movable. In a fuel injection valve of an internal combustion engine that injects fuel containing air bubbles from a nozzle hole provided at the tip of the valve body, at least one of the wall surface of the valve body and the wall surface of the needle part forming the fuel flow path One wall surface is formed with a cavitation generation passage in which the cross-sectional area of the fuel flow path is reduced compared to before and after the fuel flow direction in order to generate cavitation bubbles in the fuel flowing through the fuel flow path. A protrusion projecting into the fuel flow path, and the end of the protrusion forming the inlet portion of the cavitation generation passage is provided around the periphery of the fuel injection valve. By irregularities are formed on, to solve the problems described above (claim 9).

  According to another fuel injection valve of the present invention, the length of the end of the convex portion on the upstream side of the fuel flow can be increased. As described above, since cavitation bubbles are generated at the ends of the convex portions, it is possible to generate more cavitation bubbles than before by increasing the length of the end portions of the convex portions.

  As described above, according to the fuel injection valve of the present invention, cavitation bubbles generated at the inlet of the cavitation generation passage can be increased, so that more cavitation bubbles are generated in the fuel than before. Can be made.

(First form)
A fuel injection valve according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is a cross-sectional view of the fuel injection valve 1 taken along the line II of FIG. 2, and FIG. 2 is a cross-sectional view of the fuel injection valve 1 taken along the line II-II of FIG. Moreover, in FIG. 1, the front-end | tip part of the fuel injection valve is expanded and shown. The fuel injection valve 1 in FIG. 1 is provided in an intake passage or a combustion chamber of an internal combustion engine, and is a well-known one that injects fuel into these. The fuel injection valve 1 includes a valve body 2 and a needle 3 provided inside the valve body 2 so as to be reciprocable in the vertical direction of FIG. Since the structure above the portion shown in FIG. 1 may be the same as that of a known fuel injection valve, the description thereof is omitted. The needle 3 is urged so as to come into contact with the seat portion 2a of the valve body 2 by a spring (not shown), and when the needle 3 is in contact with the seat portion 2a, the tip side (see FIG. 1). Spillage of fuel to the lower side). On the other hand, when the needle 3 is driven upward in FIG. 1 by an electromagnet (not shown), the needle 3 is separated from the seat portion 2a as shown in FIG. 1, and the fuel is injected into the fuel injection valve through the separated portion. 1 is sent to the tip side. This fuel is then injected to the outside through a plurality of injection holes 4 provided at the tip of the valve body 2 via a fuel flow path 10 formed between the valve body 2 and the needle 3.

  As shown in FIG. 1, the inner wall 2 b of the valve body 2 is provided with a convex portion 20 that protrudes into the fuel flow path 10. As shown in FIG. 2, the convex portion 20 is provided over the entire circumference inside the valve body 2. By this convex portion 20, the flow passage cross-sectional area of the fuel flow passage 10 in the portion where the convex portion 20 is provided can be reduced compared to before and after that portion. Hereinafter, the portion of the fuel flow channel 10 where the cross-sectional area of the convex portion 20 is reduced is referred to as a cavitation generation passage 11. The convex portion 20 has a cross-sectional area at the inlet of the cavitation generation passage 11 and a cross-sectional area formed between the seat portion 2a of the valve body 2 and the needle 3 when they are separated from each other. It is provided so as to be smaller than the total channel cross-sectional area of the holes 4. Further, a portion where the flow passage cross-sectional area is wider than the cavitation generation passage 11 downstream of the cavitation generation passage 11 is referred to as a cavitation mixing unit 12. The inner wall 2b of the valve body 2 and the outer wall 3a of the needle 3 are smoothly connected to portions forming the fuel flow path 10 from the outlet of the cavitation generation passage 11 to the injection hole via the cavitation mixing portion 12. In other words, the wall surfaces of these portions are formed in a shape connected by smooth streamlines.

  FIG. 3 is an enlarged view of a portion A surrounded by a line in FIG. As shown in FIG. 3, the upstream end face 21 of the convex portion 20 is formed to face the fuel flow in the fuel flow path 10. The side surface 22 of the convex portion 20 is gradually retracted from the end portion 21a of the upstream end surface 21 toward the inner wall 2b side of the valve body 2 in a range not reaching the inner wall 2b, and then formed substantially parallel to the outer wall 3a of the needle 3. . By forming the side surface 22 in this way, the protruding portion 20 is provided with the retreating portion 23. Note that the angle α at which the side surface 22 recedes from the end portion 21a of the upstream end surface 21 is set within 90 °, for example. The downstream end face 24 of the convex portion 20 is formed so as to recede toward the upstream side (the upper side in FIG. 3) of the fuel flow from the inside to the outside of the fuel flow path 10. The angle β with which the downstream end face 24 recedes is set within 90 °, for example.

  FIG. 4 shows an example of a fuel flow state in the fuel injection valve 1. When the needle 3 is driven upward and the needle 3 and the seat portion 2a are separated from each other, the fuel flows into the fuel flow path 10 through the gap. When this fuel flows into the cavitation generation passage 11, a cavitation phenomenon occurs in the fuel, and cavitation bubbles are generated in the fuel. More specifically, as described above, the side surface 22 of the convex portion 20 recedes from the end portion 21a at an angle α, so that the fuel flow is separated from the side surface 22 at the end portion 21a. Since the cavitation phenomenon can be generated by this separation, cavitation bubbles can be generated in the fuel at the inlet of the cavitation generation passage 11. Further, since the downstream end face 24 of the convex portion 20 is retracted to the upstream side of the fuel flow at an angle β, the fuel is retained in this portion, and the fuel flow coming out of the cavitation generation passage 11 and the remaining fuel are retained. And a cavitation bubble can be generated in the fuel by a shearing force. The fuel that has flowed out of the cavitation generation passage 11 then flows into the cavitation mixing unit 12. In the cavitation mixing unit 12, a vortex can be generated by the fuel flowing out from the cavitation generation passage 11, so that the fuel can be stirred by this vortex and the cavitation bubbles can be dispersed in the fuel. Thereafter, the fuel is injected from the nozzle hole 4 to the outside.

  As described above, according to the fuel injection valve 1 of the present invention, the fuel flow is separated at the retreating portion 23 of the convex portion 20, and cavitation bubbles can be generated in the fuel by this separation. Further, since the downstream end face 24 of the convex portion 20 is retracted to the upstream side of the fuel flow at an angle β, it is generated between the fuel staying in the retracted portion and the fuel flowing out from the cavitation generation passage 11. Cavitation bubbles can be generated in the fuel by the shearing force. Furthermore, since the wall surfaces of the fuel flow path 10 from the outlet of the cavitation generation passage 11 to the injection hole 4 through the cavitation mixing portion 12 are smoothly connected, the disappearance of cavitation bubbles in the fuel can be suppressed. Therefore, more cavitation bubbles can be included in the fuel injected from the injection hole 4 than in the prior art. Therefore, atomization of the fuel injected from the nozzle hole 4 can be further promoted.

  In addition, the shape of the convex part 20 is not limited to the shape mentioned above. For example, as shown in FIG. 5, the side surface 22 of the convex portion 20 is retracted toward the inner wall 2 a side of the valve body 2 at an angle α downstream of the end portion 21 a of the upstream end surface 21 and the convex portion 20 is retracted. 23 may be provided. Further, as shown in FIG. 6, a receding portion 23 of the convex portion 20 is provided by retreating the side surface 22 in the range of not reaching the inner wall 2 b toward the inner wall 2 b side of the valve body 2 at an angle of 90 ° in the middle of the convex portion 20. May be. In these cases as well, the fuel flow can be separated at the retreating portion 23, so that cavitation bubbles can be generated in the fuel by this separation.

  Still another shape of the convex portion 20 will be described with reference to FIGS. 7 and 8. 7 and 8 correspond to FIG. 7 is different in that the end portion 21a of the upstream end surface 21 is formed so as to be uneven toward the needle 3 side. By forming the convex portion 20 in this way, the length of the end portion 21a of the upstream end surface 21 can be increased. FIG. 8 differs in that the end portion 21a of the upstream end surface 21 is roughened to form irregularities in this portion. Also in this case, the length of the end portion 21a of the upstream end surface 21 can be increased. As described above, cavitation bubbles are generated at the end 21 a of the upstream end surface 21 at the inlet of the cavitation generation passage 11. Thus, the end 21 a of the upstream end surface 21 is provided with irregularities and the end of the upstream end surface 21 is thus formed. By increasing the length of the portion 21a, more cavitation bubbles can be generated in the fuel.

(Second form)
A fuel injection valve according to a second embodiment of the present invention will be described with reference to FIGS. 9 to 11, the same reference numerals are given to portions common to FIGS. As shown in FIG. 9, this embodiment is different from the first embodiment in that the protrusion 3 is provided on the needle 3. In addition, since the shape of this convex part 30 may be the same as that of the convex part 20 of the 1st form expanded and shown in FIG. 3, description is abbreviate | omitted. Thus, even if the convex portion 30 is provided in the needle 3 and the cavitation generation passage 11 and the cavitation mixing portion 12 are provided in the fuel flow path 10, cavitation bubbles are generated in the fuel at the inlet and the outlet of the cavitation generation passage 11, respectively. Therefore, more cavitation bubbles can be generated in the fuel than before.

  10 and 11 are diagrams corresponding to FIGS. 7 and 8 of the first embodiment, respectively. Thus, by providing unevenness in the end portion 31a of the upstream end surface 31 of the convex portion 30, the length of the end portion 31a can be increased, so that more cavitation bubbles can be generated in the fuel.

(Third form)
A fuel injection valve according to a third embodiment of the present invention will be described with reference to FIGS. 12 to 15, the same reference numerals are given to the same parts as those in FIGS. 1 to 11, and description thereof is omitted. As shown in FIG. 12, this embodiment is different from the above-described embodiment in that convex portions 20 and 30 are provided so as to face both the nozzle body 2 and the needle 3. In addition, the shape of each convex part 20 and 30 may each be the same as that of the convex part 20 expanded and shown in FIG. In the case of this configuration, as shown in FIG. 13, cavitation bubbles can be generated in the fuel at the end portions 21a and 31a of the upstream end surfaces 21 and 31 of the respective convex portions 20 and 30, so that more cavitations are generated. Bubbles can be generated in the fuel.

  14 and 15 correspond to FIGS. 7 and 8 of the first embodiment, respectively. As shown in FIGS. 14 and 15, when both the nozzle body 2 and the needle 3 are provided with the convex portions 20 and 30, the convex portions 20 and 30 do not interfere with each other when the needle 3 is driven. In addition, irregularities are provided on the end portions 21a and 31a of the upstream end surfaces 21 and 31 of the convex portions 20 and 30, respectively. As described above, by providing irregularities on the end portions 21a and 31a and increasing the lengths of the end portions 21a and 31a, it is possible to generate more cavitation bubbles in the fuel.

  This invention is not limited to each form mentioned above, It can implement with a various form. For example, in each of the above-described embodiments, the inner valve is shown in which the needle is driven inside the fuel injection valve. However, the fuel injection valve of the present invention is an outer valve that is driven outside the fuel injection valve. May be.

  As shown in FIGS. 7, 8, 10, 11, 14, and 15, when the convex portion is formed so as to be uneven in the circumferential direction of the fuel injection valve, the side surface of the convex portion is You may form substantially parallel with respect to the wall surface facing the convex part. In this way, even if the side surface of the convex portion is formed substantially parallel to the opposing wall surface, it is possible to increase the length of the end portion by providing irregularities on the end portion of the upstream end surface of the convex portion. In addition, more cavitation bubbles than before can be generated.

The figure which shows the fuel injection valve which concerns on the 1st form of this invention. The figure which shows the cross section of the fuel injection valve in the II-II line | wire of FIG. The figure which expands and shows the part enclosed with the line of FIG. The figure which shows an example of the flow state of the fuel in the fuel injection valve of FIG. The figure which shows the 1st modification of the convex part of a 1st form. The figure which shows the 2nd modification of the convex part of a 1st form. The figure which shows the 3rd modification of the convex part of a 1st form. The figure which shows the 4th modification of the convex part of a 1st form. The figure which shows the fuel injection valve which concerns on the 2nd form of this invention. The figure which shows the modification of the convex part of a 2nd form. The figure which shows the other modification of the convex part of a 2nd form. The figure which shows the fuel injection valve which concerns on the 3rd form of this invention. The figure which shows an example of the flow state of the fuel in the fuel injection valve of FIG. The figure which shows the modification of the convex part of a 3rd form. The figure which shows the other modification of the convex part of a 3rd form.

Explanation of symbols

1 Fuel injection valve 2 Valve body 3 Needle (needle part)
4 Injection hole 10 Fuel flow path 11 Cavitation generation passage 12 Cavitation mixing part 20, 30 Convex part 21a, 31a End part

Claims (9)

The fuel containing cavitation bubbles generated in the fuel passage is passed through a fuel passage formed between the valve body and a needle portion provided in the valve body so as to be reciprocally movable. In a fuel injection valve of an internal combustion engine that injects from a nozzle hole provided at the tip,
A flow path of the fuel flow path is formed on at least one of the wall surface of the valve body and the wall surface of the needle portion forming the fuel flow path so as to generate cavitation bubbles in the fuel flowing through the fuel flow path. Protrusions projecting into the fuel flow path are provided so as to form a cavitation generation passage whose cross-sectional area decreases compared to before and after the fuel flow direction,
The convex portion has a side surface of the convex portion provided along the fuel flow in the cavitation generation passage so that a flow passage cross-sectional area of the cavitation generation passage is expanded downstream from an inlet portion of the cavitation generation passage. A fuel injection valve comprising a retracted portion that is retracted within a range that does not reach the wall surface on which is provided.   The side surface provided along the fuel flow in the cavitation generation passage of the convex portion gradually recedes from the inlet portion of the cavitation generation passage toward the wall surface on which the convex portion is provided. The fuel injection valve described in 1.   The convex portion is retreated to a wall surface provided with the convex portion while gradually retreating from an end portion forming an outlet portion of the cavitation generation passage toward a fuel flow upstream side of the fuel flow path. The fuel injection valve according to claim 1 or 2.   4. The unevenness is formed in the circumferential direction of the fuel injection valve at an end of the convex portion that forms the inlet portion of the cavitation generation passage. 5. Fuel injection valve.   The fuel injection valve according to any one of claims 1 to 4, wherein the convex portion is provided so as to face both the wall surface of the valve body and the wall surface of the needle portion.   The flow passage cross-sectional area of the inlet portion of the cavitation generation passage is the flow passage cross-sectional area formed between the seat portion of the valve body and the needle portion during fuel injection of the fuel injection valve, and the flow passage of the injection hole The fuel injection valve according to any one of claims 1 to 5, wherein the fuel injection valve is set smaller than a cross-sectional area.   In the downstream of the cavitation generation passage of the fuel flow path, the flow passage cross-sectional area is larger than the flow passage cross-sectional area of the cavitation generation passage, and the cavitation bubbles generated in the cavitation generation passage are mixed with the fuel. The fuel injection valve according to any one of claims 1 to 6, wherein a cavitation mixing unit is provided.   The wall surface of the valve body and the wall surface of the needle part are each smoothly connected to a part forming a fuel flow path from the outlet part of the cavitation generation passage to the nozzle hole via the cavitation mixing part. The fuel injection valve according to any one of claims 1 to 7. The fuel containing cavitation bubbles generated in the fuel passage is passed through a fuel passage formed between the valve body and a needle portion provided in the valve body so as to be reciprocally movable. In a fuel injection valve of an internal combustion engine that injects from a nozzle hole provided at the tip,
A flow path of the fuel flow path is formed on at least one of the wall surface of the valve body and the wall surface of the needle portion forming the fuel flow path so as to generate cavitation bubbles in the fuel flowing through the fuel flow path. Protrusions projecting into the fuel flow path are provided so as to form a cavitation generation passage whose cross-sectional area decreases compared to before and after the fuel flow direction,
A fuel injection valve characterized in that unevenness is formed in the circumferential direction of the fuel injection valve at an end of the convex portion forming the inlet portion of the cavitation generation passage.

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