JP4135628B2 - Fuel injection valve - Google Patents

Description

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

Conventionally, in this type of fuel injection valve, a blanker type fuel injection valve and a face type fuel injection valve are selectively used depending on the required valve opening operating force. For example, an in-cylinder injection type fuel injection valve that directly injects atomized fuel into the cylinder at a high fuel pressure generates a high suction force by increasing the suction area of the armature with respect to the solenoid (electromagnetic coil) A face-type fuel injection valve that can be operated is used. In such a face-type fuel injection valve, for example, as in the fuel injection valve described in Patent Document 1, a core having a solenoid in a case, and an armature that moves toward and away from the core based on excitation and demagnetization of the solenoid, It has. A fuel passage is formed between the inner surface of the case and the outer edge of the armature to communicate the upper armature chamber and the lower armature chamber, which are partitioned vertically by the armature in the case. The fuel in the case (armature chamber) flows between the upper armature chamber and the lower armature chamber via the fuel passage. Therefore, according to the fuel injection valve of Patent Document 1, when the valve is opened and closed, the armature is moved by the fluid pressure of the fuel flowing from one of the upper armature chamber and the lower armature chamber to the other through the fuel passage. Since the speed is limited, so-called valve opening bouncing and valve closing bouncing in which the armature collides with the core or the like and bounces are suppressed.
JP-A-8-210217 (paragraph number [0031], FIG. 1)

However, the fuel injection valve described in Patent Document 1 has the following problems.
That is, when moving from the valve opening position where the armature is in the highest position and close to (or abuts to) the core to the valve closing position that is the lowest position as the valve closing operation starts, A fluid force (so-called reverse squeeze force) that prevents the armature from moving away from the core acts on the armature by the fuel that exists in a slight gap between the core and the armature at the valve opening position. Therefore, the reverse squeeze force causes a delay in the initial valve closing operation, resulting in a problem that the valve closing response is deteriorated. In addition, this reverse squeeze force changes greatly due to changes in the viscosity of the fuel due to changes in temperature. Therefore, the difference in viscosity based on changes in the temperature of the fuel also affects the valve closing response. was there.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide fuel injection capable of suppressing so-called valve opening bouncing and valve closing bouncing, and capable of reliably obtaining particularly good valve closing response. To provide a valve.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to the first aspect of the present invention, a core having an electromagnetic coil is fixed in a case to which fuel is supplied, and an armature that moves in response to excitation of the electromagnetic coil is disposed below the core in the case. A fuel injection valve configured to inject fuel from within the case when the armature moves from a valve closing position spaced apart from the core by a predetermined distance toward a valve opening position close to the core; The armature has an armature main body that divides the inside of the case into an upper armature chamber and a lower armature chamber below the core, and penetrates a fuel passage that connects the upper armature chamber and the lower armature chamber to the armature main body. And the opening area of the lower passage opening facing the lower armature chamber of the fuel passage is larger than the opening area of the upper passage opening facing the upper armature chamber. And summary that was.

  Now, in response to the excitation of the electromagnetic coil, when the armature is configured to move from the valve closing position separated from the core by a predetermined distance to the valve opening position close to the core, when the electromagnetic coil is excited, The armature starts moving toward the core to allow fuel injection from within the case. Then, as the movement of the armature starts, the fuel staying in the upper armature chamber between the armature body and the core tends to flow to the lower armature chamber through the fuel passage formed through the armature body. . That is, the fuel flows into the fuel passage through the upper passage opening and flows out to the lower armature chamber through the lower passage opening.

  In this regard, in the invention according to claim 1, the fuel passage is set such that the opening area of the lower passage opening is larger than the opening area of the upper passage opening. In other words, in this case, the upper passage opening which is the fuel inflow side into the fuel passage is set narrower (opening area is smaller) than the lower passage opening which is the outflow side. For this reason, a throttle action acts on the flowing fuel when it flows from the upper passage opening, and the flow rate of the fuel from the upper armature chamber side to the lower armature chamber side becomes slow. As a result, in the upper armature chamber, fuel sufficient to serve as a damper between the core and the armature body (that is, to exert squeeze force) remains for a long time while gradually decreasing. . Therefore, when the armature continues to move to the core side and reaches the valve opening position where it approaches (or abuts) the core when the residual fuel in the upper armature chamber has flowed out to the lower armature chamber. However, the collision of the armature with the core can be avoided by the action of the squeeze force, and so-called valve opening bouncing during the valve opening operation is suppressed.

  On the other hand, when the armature tries to move from the valve opening position to the valve closing position in order to cut off the fuel injection from inside the case, the armature (armature main body) has a slight gap. The existing fuel tries to exert a reverse squeeze force on the armature. In other words, the pressure difference between the pressure in the gap (= upper armature chamber) and the pressure in the lower armature chamber works to prevent an operation to leave the core of the armature. In this regard, in the first aspect of the present invention, as described above, the fuel passage formed through the armature body has a larger opening area at the lower passage opening than at the upper passage opening. Is set. In other words, in this case, the lower passage opening which is the inflow side of the fuel into the fuel passage is set wider (opening area is larger) than the upper passage opening which is the outflow side. Therefore, fuel quickly flows from the lower armature chamber to the upper armature chamber (= the gap) via the fuel passage, and the reverse squeeze force is reduced by eliminating the pressure difference. Therefore, it is possible to avoid a delay in the initial operation of closing the valve and to ensure a good valve closing response.

According to a second aspect of the present invention, in the fuel injection valve according to the first aspect, the armature is configured such that the upper surface portion of the armature body is close to the lower surface portion of the core at the valve-opening position, and the fuel passage The upper passage opening is formed in an opening in a portion of the upper surface of the armature body that faces the lower surface of the core. Therefore, in the invention described in claim 2 , the upper armature chamber is more open during the valve opening operation and the valve closing operation than when the fuel passage is formed between the outer edge of the armature body and the inner surface of the case. Since the flow path of fuel between the lower armature chamber and the lower armature chamber can be shortened, good valve opening response and valve closing response are ensured. In particular, at the initial stage of valve closing, fuel can be quickly allowed to flow into a slight gap (= upper armature chamber) between the core, the lower surface portion, and the upper surface portion of the armature body, thereby avoiding delay in the initial valve closing operation. it can.

According to a third aspect of the present invention, in the fuel injection valve according to the first or second aspect , the fuel passage has an equal passage cross-sectional area from the middle of the fuel passage at each position along the passage direction. The first passage portion is configured to be configured so that the first passage portion is located at each position along the passage direction with a passage cross-sectional area continuing from the middle of the fuel passage to the first passage portion. The gist is that the second passage portion is set to be larger than the second passage portion.

Therefore, in the invention described in claim 3 , during the valve opening operation, the fuel flows from the upper armature chamber into the first passage portion through the upper passage opening, and the flow velocity is reduced by being throttled in the first passage portion. After being delayed, it flows into the second passage part. Then, when flowing in the second passage portion, the flow velocity is gradually increased and flows out to the lower armature chamber through the lower passage opening. On the other hand, when the valve is closed (particularly in the initial stage), the fuel quickly flows from the lower armature chamber into the second passage through the lower passage opening, and the first passage from the second passage. Flows into. Then, after passing through the first passage portion, the flow velocity is slightly reduced, and then flows out to the upper armature chamber through the upper passage opening.

According to a fourth aspect of the present invention, in the fuel injection valve according to the first or second aspect , the fuel passage gradually increases in cross-sectional area from the upper passage opening to the lower passage opening. The gist is that it is set as follows. Therefore, in the invention described in claim 4 , the upper passage port portion exerts a throttling action during the valve opening operation in which fuel flows from the upper armature chamber to the lower armature chamber through the fuel passage. On the other hand, during the valve closing operation in which the fuel flows from the lower armature chamber to the upper armature chamber through the fuel passage, the fuel flows into the fuel passage quickly from the lower passage opening, particularly in the initial valve closing, and then the upper passage opening. Flows out to the upper armature chamber.

Hereinafter, an embodiment in which the present invention is embodied in a face-type fuel injection valve will be described with reference to FIGS.
As shown in FIG. 1, the fuel injection valve 10 of the present embodiment includes a substantially cylindrical case 11, and the case 11 is formed with a small diameter portion 11 a at the lower side and a large diameter at the upper side. It is formed in the part 11b. A nozzle 12 is fitted into the lower end of the small diameter portion 11 a, and a fuel injection hole 12 a is formed at the lower end portion (tip portion) of the nozzle 12 so as to be exposed to the outside of the case 11. On the other hand, a cylindrical core 13 is fitted and fixed in the large-diameter portion 11 b of the case 11, and an electromagnetic coil (solenoid) 14 is disposed in the core 13. A fuel supply port 15 for supplying fuel F having a predetermined fuel pressure into the case 11 is formed at the center of the core 13, and a lower surface portion of the core 13 is communicated with the fuel supply port 15. A recess 16 is formed from the side 13a. A coil spring 17 having a predetermined urging force is provided in the recess 16 so as to extend below the lower surface portion 13a of the core 13, and a high permeability material (for example, An armature 18 made of iron or nickel is supported and fixed.

  The armature 18 includes an armature main body 19 having a substantially disc shape, and a needle 20 connected to the lower side of the armature main body 19 so as to extend vertically downward. The armature body 19 has an upper surface portion 19a formed in a planar shape having substantially the same area as the lower surface portion 13a of the core 13, and the upper surface portion 19a of the armature body 19 and the lower surface portion 13a of the core 13 can be in surface contact with each other. Has been. The lower end of the needle 20 is inserted into the nozzle 12. Accordingly, when the valve is closed, the electromagnetic coil 14 is demagnetized, and the armature 18 moves to a lower position (a valve closing position) separated from the core 13 by a biasing force of the coil spring 17 to inject fuel. The hole 12 a is closed by the lower end portion of the needle 20. On the other hand, at the time of valve opening operation, the armature 18 responds to the excitation of the electromagnetic coil 14 to the upper position (position at the time of valve opening) where the upper surface portion 19a of the armature body 19 is close to the lower surface portion 13a of the core 13. The fuel injection hole 12a is opened by moving against the urging force of the spring 17 and moving the needle 20 upward.

  FIG. 1 shows a state in which the armature 18 is in the valve closing position. As shown in FIG. 1, the armature body 19 has an upper armature chamber A in the case 11 on the fuel supply port 15 side. And the lower armature chamber B on the fuel injection hole 12a side. The armature body 19 is formed with a plurality of (two shown in FIG. 1) fuel passages 21 communicating therewith between the upper armature chamber A and the lower armature chamber B. The fuel passage 21 allows the fuel F to flow between the upper armature chamber A and the lower armature chamber B as the armature 18 moves during the valve opening operation and the valve closing operation. The opening area of the upper passage opening 21a facing the upper armature chamber A is set to be smaller than the opening area of the lower passage opening 21b facing the lower armature chamber B.

  In other words, the fuel passage 21 is set so that the upper side connecting to the upper passage opening 21a in the middle of the fuel passage 21 has the same passage cross-sectional area in a section perpendicular to the passage direction (vertical direction) at each position along the passage direction. The straight passage portion (first passage portion) 22 is formed. In addition, the lower side of the fuel passage 21 that extends from the middle of the fuel passage 21 to the lower passage port portion 21b is continuous with the straight passage portion 22 and has a cross-sectional area that is perpendicular to the passage direction. It is comprised in the taper-shaped channel | path part (2nd channel | path part) 23 set so that it might become larger than the said linear channel | path part 22 in a position. The upper passage port portion 21a has a diameter larger than the outer edge portion 19b of the armature body 19 among the upper surface portion 19a of the armature body 19 that faces the lower surface portion 13a of the core 13 at the valve-opening position. An opening is formed at a position closer to the center (inner side) in the direction. Further, between the outer edge portion 19b of the armature body 19 and the inner surface 11c of the case 11, the fuel F is interposed between the upper armature chamber A and the lower armature chamber B when the armature 18 is moved, like the fuel passage 21. A slight gap S is formed to allow the fluid to flow.

Next, the operation of the fuel injection valve 10 of the present embodiment configured as described above will be described below. First, the operation during the valve opening operation will be described, and then the operation during the valve closing operation will be described.
Before the start of the valve opening operation (that is, when the valve is closed), the fuel injection valve 10 has an upper surface portion 19a of the armature body 19 that is separated from the lower surface portion 13a of the core 13 and a lower end portion of the needle 20 that is fuel injected. The state shown in FIG. 1 is shown in which the hole 12a is closed. Therefore, the fuel F stays in the upper armature chamber A located above the armature body 19 in the case 11 as shown in FIG. If the electromagnetic coil 14 is excited for fuel injection from this state, a magnetic force (adsorption force) stronger than the downward biasing force by the coil spring 17 is generated in the core 13, and the armature 18 (the armature body 19 , The needle 20) starts moving upward so as to approach the core 13.

  Then, as the armature 18 moves upward, the upper armature chamber A becomes narrower in the vertical direction, so that the fuel F staying in the upper armature chamber A flows from each fuel passage 21 to the lower armature chamber B. Try to flow. However, in this case, each fuel passage 21 has an upper passage opening 21a on the fuel F inflow side that is narrower (smaller opening area) than the lower passage opening 21b. Thus, when flowing into the fuel passage 21, the flow rate becomes slow due to the restriction. Moreover, the straight passage portion 22 connected to the upper passage opening portion 21a is set so that the passage cross-sectional area is the same as that of the upper passage opening portion 21a and is equal at each position along the passage direction. The fuel F continues to be throttled until it passes through the straight passage portion 22. When the fuel F passes through the straight passage portion 22 and flows into the tapered passage portion 23, the flow rate of the fuel F is gradually increased, and the lower armature chamber B extends from the fuel passage 21 through the lower passage opening 21b. Spill to

  Therefore, while the throttle is applied, the fuel F does not disappear from the upper armature chamber A, and the remaining fuel F is a damper between the core 13 and the armature body 19. Play a role (ie, exert squeeze power). Therefore, when the fuel F remaining in the upper armature chamber A finishes flowing out to the lower armature chamber B through the fuel passage 21, the armature body 19 comes into surface contact (contact) with the core 13, but also in that case. The upper surface portion 19a of the armature body 19 gently comes into surface contact (contact) without colliding with the lower surface portion 13a of the core 13. As a result, as shown in FIG. 3A, when the squeeze force does not work, the armature main body 19 violently collides with the core 13 to cause so-called valve opening bouncing. In this embodiment, as shown in FIG. 3C, such valve opening bouncing is suppressed during the valve opening operation.

  On the other hand, when the valve is opened when the upper surface portion 19a of the armature body 19 and the lower surface portion 13a of the core 13 are close to each other (surface contact in this embodiment), the upper surface portion 19a and the lower surface portion 13a are in close contact with each other. Therefore, the fuel F existing in the closely spaced gap (= upper armature chamber A) tends to exert a reverse squeeze force on the armature 18. That is, even if the pressure difference between the pressure in the gap (= the upper armature chamber A) and the pressure in the lower armature chamber B is affected, and the urging force of the coil spring 17 tries to separate the armature 18 from the core 13, Attempts to prevent separation movement. Therefore, if the fuel passage 21 is composed only of a straight passage portion that penetrates the armature body 19 in the vertical direction, such a reverse squeeze force acts as shown in FIG. Therefore, there is a possibility that a delay occurs in the initial operation of closing the valve.

  However, in this regard, the fuel passage 21 in this embodiment has a wider opening area in the lower passage opening 21b on the inflow side of the fuel F in this case than the upper passage opening 21a on the outflow side ( The opening area is large). Therefore, as shown in FIG. 2 (b), the fuel F staying in the lower armature chamber B is likely to flow into the fuel passage 21 from the lower passage opening portion 21b having a large opening area. It quickly flows into the upper armature chamber A (the gap) through the portion 21a. And the reverse squeeze force is reduced by eliminating the pressure difference by the rapid inflow of the fuel F into the upper armature chamber A (the gap). Therefore, there is no delay in the initial valve closing operation, and good valve closing response is ensured. Further, when the armature 18 moves downward, the fuel F that tends to wrap around the gap S between the upper passage opening 21a of the fuel passage 21 or the outer edge 19b of the armature body 19 and the inner surface 11c of the case 11. In order to receive pressure from the armature 18, the downward movement speed of the armature 18 is also reduced. Therefore, when the needle 20 comes into contact with the nozzle 12 so as to close the fuel injection hole 12a of the nozzle 12, the contact is made gently, and as shown in FIG. So-called valve closing bouncing is also suppressed.

  By the way, the fuel F has a temperature robustness such that when the temperature is high, the viscosity is low and the fuel F tends to flow in the fuel passage 21, whereas when the temperature is low, the viscosity is high and the flow inside the fuel passage 21 is difficult to flow. Yes. Therefore, if the fuel passage 21 is composed only of a straight passage portion that penetrates the armature body 19 in the vertical direction, the valve is closed as the temperature changes as shown by a broken line in FIG. Variation occurs and the valve closing response becomes uncertain. However, in the case of the present embodiment, as described above, the opening area of the lower passage opening 21b is set larger than the opening area of the upper passage opening 21a. Even if the viscosity of the fuel changes, the flow of the fuel F into the fuel passage 21 does not vary greatly. Therefore, as shown in FIG. 3C, the variation in valve closing response is eliminated.

According to this embodiment, the following effects can be obtained.
(1) When the armature 18 moves toward the core 13 during the valve opening operation, the fuel F is in the upper armature chamber A between the upper surface portion 19a of the armature body 19 and the lower surface portion 13a of the core 13 for a long time. The remaining fuel F plays a role of a damper that prevents the armature 18 and the core 13 from strongly colliding with each other. That is, a so-called squeeze force is exhibited. Therefore, the occurrence of so-called valve opening bouncing in which the armature 18 collides with the core 13 and moves up and down in small increments can be suppressed, and the durability of the armature 18 can be improved.

  (2) During valve closing operation (particularly in the initial stage of valve closing), it is interposed in a slight gap between the lower surface portion 13a of the core 13 and the upper surface portion 19a of the armature body 19 that are close to each other (surface contact in this embodiment). The fuel F is exerted a reverse squeeze force that tends to prevent the armature 18 from moving away from the core 13. However, in this case, the opening area of the lower passage opening 21b that is the inflow side of the fuel passage 21 is set to be larger than the opening area of the upper passage opening 21a that is the outflow side. Since the fuel F quickly flows into the passage 21, the reverse squeeze force is quickly eliminated. Accordingly, it is possible to prevent a delay from occurring in the initial operation of closing the valve, and to secure a good valve closing response.

  (3) Even when the viscosity of the fuel F changes due to temperature change during the valve closing operation, the opening area of the lower passage opening 21b in the fuel passage 21 is larger than the opening area of the upper passage opening 21a. Since it is set, there is no great variation in the manner in which the fuel F flows into the fuel passage 21. Accordingly, it is possible to ensure the valve closing response with no variation under any temperature environment.

  (4) When the fuel F remaining in the upper armature chamber A during the valve opening operation is allowed to flow out to the lower armature chamber B, the upper passage port portion 21a of the fuel passage 21 is more than the outer edge portion 19b of the armature body 19. Since the opening is formed closer to the inner side in the radial direction, the fuel F can be quickly discharged from the upper armature chamber A. Therefore, for example, the valve opening response can be improved as compared with the case where the fuel passage 21 is configured only by the gap S between the outer edge portion 19b of the armature body 19 and the inner surface 11c of the case 11.

  (5) The upper passage opening 21a and the lower passage opening 21b of the fuel passage 21 are both an opening of the straight passage 22 and an opening of the tapered passage 23, and the opening edges thereof are Since it is not edge-shaped, the possibility of breakage or chipping can be reduced.

  (6) Since the fuel F can continue to be throttled while the fuel F passes through the straight passage 22 connected to the upper passage opening 21a during the valve opening operation, the squeeze force is maintained appropriately. can do.

The above embodiment may be changed to another embodiment (another example) as follows.
-In the said embodiment, as shown to Fig.4 (a), as for the fuel passage 21, the passage cross-sectional area of the cross section orthogonal to a passage direction is gradually increased from the upper side passage opening part 21a toward the lower side passage opening part 21b. It is good also as a channel | path structure of the taper-shaped channel | path (the same form as the taper-shaped channel | path part 23 of the said embodiment) which expands so that the lower side set so that it may become large. Also when comprised in this way, the effect similar to said (1)-(5) of the said embodiment can be acquired.

  In the above embodiment, as shown in FIG. 4B, the fuel passage 21 has a passage cross-sectional area that is continuous with the first passage portion (22) connected to the upper passage opening portion 21a than the first passage portion. It is good also as a stepped path | pass structure provided so that the linear 2nd path part (23) set large could be connected with the lower side channel | path opening part 21b. Also when comprised in this way, the effect similar to said (1)-(6) of the said embodiment can be acquired.

  In the above embodiment, as shown in FIG. 4C, the fuel passage 21 may have a passage configuration in which a plurality of passages having the same passage cross-sectional area are branched downward from the upper passage opening 21a. Even when configured in this way, the lower passage opening 21b is larger than the upper passage opening 21a, so that the total opening area of the lower passage opening 21b is larger than the opening area of the upper passage opening 21a. It becomes large and the same effect as said (1)-(6) of the said embodiment can be acquired.

  In the above embodiment, without forming the fuel passage 21 through the armature body 19, only the gap between the outer edge portion 19 b of the armature body 19 and the inner surface 11 c of the case 11 is formed as shown in FIG. The fuel passage 21 may be used. In this case, if the gap between the case 11 and the outer edge portion 19b of the armature body 19 is increased toward the lower side of the inner surface 11c, the fuel passage 21 has a lower passage opening portion 21b on the upper passage opening portion 21a. The opening area is larger than that of the first embodiment, and the same effects as in the above embodiments (1) to (3) can be obtained.

  In the above embodiment, as shown in FIG. 5B, when only the gap between the outer edge portion 19b of the armature body 19 and the inner surface 11c of the case 11 is the fuel passage 21, the outer edge portion 19b of the armature body 19 May be configured to have a tapered peripheral surface toward the inner side in the radial direction toward the lower side. Also when comprised in this way, the effect similar to said (1)-(3) of the said embodiment can be acquired.

  In the above embodiment, the fuel passage 21 has a notch groove formed in the outer edge 19b of the armature body 19 from the outer peripheral surface side, and the lower groove opening portion has a larger opening portion than the upper groove opening portion of the notch groove. The fuel passage 21 may be configured by the notch groove formed as described above.

The longitudinal cross-sectional view of the fuel injection valve which concerns on this embodiment. (A) is schematic explanatory drawing explaining the flow aspect of the fuel at the time of valve opening operation | movement, (b) is schematic explanatory drawing explaining the flow aspect of the fuel at the time of valve closing operation | movement. (A) is explanatory drawing at the time of valve opening operation when squeeze force does not work, (b) is explanatory drawing at the time of valve closing operation when temperature robustness influences, (c) is the valve opening operation in this embodiment Explanatory drawing at the time of a time and valve closing action | operation. (A) (b) (c) is a schematic explanatory drawing of another embodiment which formed the fuel channel | path in the armature main body. (A) (b) is a schematic explanatory drawing of another embodiment which formed the fuel channel in the clearance gap between the outer edge part of an armature main body, and the inner surface of a case.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Fuel injection valve, 11 ... Case, 11c ... Inner surface, 13 ... Core, 13a ... Lower surface part, 14 ... Electromagnetic coil, 18 ... Armature, 19 ... Armature main body, 19a ... Upper surface part, 19b ... Outer edge part, 21 ... Fuel Passage 21a: upper passage port, 21b lower passage port, 22: straight passage portion as first passage portion, 23: tapered passage portion as second passage portion, A: upper armature chamber, B ... lower armature chamber, F ... fuel.

Claims (4)

A core having an electromagnetic coil is fixed in a case to which fuel is supplied, and an armature that moves in response to the excitation of the electromagnetic coil is disposed below the core in the case, and the armature has a predetermined distance from the core. In a fuel injection valve configured to inject fuel from within the case when the valve is moved from a valve-closed position spaced apart only toward a valve-opened position close to the core,
The armature has an armature main body that divides the inside of the case into an upper armature chamber and a lower armature chamber below the core, and penetrates a fuel passage that communicates the upper armature chamber and the lower armature chamber to the armature main body. A fuel injection valve characterized in that the opening area of the lower passage opening facing the lower armature chamber of the fuel passage is set larger than the opening area of the upper passage opening facing the upper armature chamber. The armature is configured such that the upper surface portion of the armature body is close to the lower surface portion of the core at the valve-opening position, and the upper passage port portion of the fuel passage is the lower surface portion of the core of the upper surface portion of the armature body. The fuel injection valve according to claim 1, wherein an opening is formed in a portion opposite to . The fuel passage is composed of a first passage portion set so that the passage cross-sectional area on the upper side from the middle of the fuel passage is equal at each position along the passage direction, while the lower side from the middle of the fuel passage is the second claim 1 or claim is composed of the passage portion is set to be larger than the first passage portion at each position along the continuous and cross-sectional area of the passage direction in the first passage portion 2. The fuel injection valve according to 2. 3. The fuel injection valve according to claim 1 , wherein the fuel passage is set so that a passage cross-sectional area gradually increases from the upper passage opening to the lower passage opening . 4.

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