JP2018184843A - Fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable suitable changeover of fuel injection.SOLUTION: A fuel injection part 20 includes a nozzle body 22 shaped cylindrical and having a sack chamber 27 and an injection hole 28 extending from the sack chamber 27, at the front end, and a needle 30 provided in the nozzle body 22 in a reciprocating manner. The needle 30 seated on the inner peripheral face of the nozzle body 22 is left therefrom, and along therewith fuel is injected from the injection hole 28. The needle 30 has a through passage 36 extending in the axial direction. A passage inlet 36a of the through passage 36 is provided in the needle 30 at its downstream side further than a seat part 34a to be seated on the inner peripheral face of the nozzle body 22, and at its upstream side further than the sack chamber 27.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel injection valve.

  In a fuel injection valve that injects fuel into a combustion chamber of an internal combustion engine, various technical improvements have been made to optimize the form of fuel spray in the combustion chamber. For example, the fuel injection valve described in Patent Document 1 has a configuration in which a spiral swirl groove is provided on the outer peripheral portion of a needle that is reciprocally accommodated in a nozzle body, whereby the fuel flow that has passed through the seat portion is reduced. A swirl component is imparted, and fuel spray having high dispersion characteristics is formed by swirling the fuel.

Japanese Patent Laid-Open No. 10-176631

  However, the fuel injection valve disclosed in Patent Document 1 has a configuration in which high dispersion characteristics are uniformly imparted in any fuel injection state during fuel injection. Therefore, it is impossible to realize fuel injection even in a situation where it is desirable to form a spray with a strong penetration state instead of a spray with a high dispersion state. For example, when spray penetration is insufficient during high-load operation of an internal combustion engine, combustion concentrates in a region near the fuel injection valve in the combustion chamber. As a result, the amount of oxygen is locally insufficient, and problems such as a decrease in output and an increase in smoke due to a decrease in combustion speed may occur. In addition, when the internal combustion engine is operated at a low load, if the spray penetration is excessive, heat escape near the wall surface in the combustion chamber is increased, which may cause a problem of deterioration in fuel consumption due to a decrease in efficiency.

  This invention is made | formed in view of the said subject, The main objective is to provide the fuel injection valve which makes it possible to switch fuel spray suitably.

  A fuel injection valve according to the present disclosure includes a body that has a cylindrical shape and has a sac chamber and an injection hole extending from the sac chamber at a distal end portion thereof, and a valve body that is provided in the body so as to be capable of reciprocating. A fuel injection valve that injects fuel from the nozzle hole by separating from a seated state with respect to the inner peripheral surface of the body, wherein the valve body has a through passage extending in an axial direction thereof. In addition, the passage inlet of the through passage is provided on the downstream side of the seat portion seated on the inner peripheral surface of the body in the valve body and on the upstream side of the sac chamber.

  According to the above configuration, when the valve body is separated from the inner peripheral surface of the body when the fuel injection valve is opened, fuel can flow into the sac chamber through two paths. One path is a path that passes through a gap between the inner peripheral surface of the body and the outer peripheral surface of the valve body, and the other path is a path that passes through a through passage provided in the valve body. In particular, with regard to the through-passage, the passage inlet is provided on the downstream side of the seat part of the valve body and on the upstream side of the sac chamber, so that fuel does or does not flow into the through-passage. Is switched according to the lift amount of the valve body. In other words, in a situation where the lift amount of the valve body is relatively small, the gap between the inner peripheral surface of the body and the outer peripheral surface of the valve body is small, so that fuel easily flows into the through passage, and the fuel sucks through the through passage. Flows into the room. Further, in a situation where the lift amount of the valve body is relatively large, the gap between the inner peripheral surface of the body and the outer peripheral surface of the valve body is large, so that it is difficult for the fuel to flow into the through passage, and the fuel passes through the through passage. It flows into the sac chamber via a gap between the inner peripheral surface of the body and the outer peripheral surface of the valve body.

  Here, when the fuel flows into the sac chamber via the through-passage, fuel collision or stagnation is likely to occur in the sac chamber, and fuel injection is performed from the nozzle hole in such a state that the fuel flow is disturbed. Therefore, fuel spray in a highly dispersed state can be formed in the combustion chamber. On the other hand, when the fuel flows into the sac chamber via the gap between the inner peripheral surface of the body and the outer peripheral surface of the valve body without passing through the through passage, the fuel directly passes through the sac chamber. Since it flows into the nozzle hole, the fuel spray can be formed in a strongly penetrating state in the combustion chamber. As described above, a fuel injection valve that enables the fuel spray to be switched appropriately can be realized.

Sectional drawing which shows the structure of the front-end | tip part of a fuel injection valve. (A) is the perspective view which shows the front-end | tip structure of a needle, (b) is the front view which looked at the needle from the front end side. The figure for supplementary explanation of the composition of a needle. (A) is a figure which shows the flow of fuel when the lift amount of a needle is small, (b) is a figure which shows the flow of fuel when the lift amount of a needle is small. (A) is a figure which shows fuel spray when the lift amount of a needle is small, (b) is a figure which shows fuel spray when the lift amount of a needle is small. The figure which shows the structure around the combustion chamber of an engine. The figure which shows the structure of the needle in another example. The figure which shows the structure of the needle in another example. The figure which shows the structure of the needle in another example.

  Hereinafter, embodiments will be described with reference to the drawings. The present embodiment embodies a fuel injection valve used in a diesel engine for a vehicle, and the fuel injection valve performs a valve opening operation in response to a valve opening command signal from an electronic control unit (ECU). The high-pressure fuel accumulated in the common rail is injected into the engine combustion chamber. FIG. 6 is a diagram showing a configuration around the combustion chamber of the engine.

  In FIG. 6, a piston 12 is accommodated in an engine cylinder 11, and a combustion chamber 13 is formed on the upper surface side of the piston 12. A recess 12a (cavity) is formed on the upper surface of the piston 12 so as to extend in the radial direction from the center. The fuel injection valve 20 realizes so-called center injection, and is provided at a position substantially at the center of the combustion chamber 13 in the cylinder head 14 above the piston 12. The fuel injection valve 20 has a cylindrical nozzle holder 21 as a configuration of its tip portion, and a nozzle body 22 held by the nozzle holder 21, and radially from the tip portion of the nozzle body 22 as shown in the figure. Fuel spray F is injected.

  FIG. 1 is an enlarged cross-sectional view showing the main configuration of the tip portion of the fuel injection valve 20. In the fuel injection valve 20, the nozzle body 22 is formed in a bottomed cylindrical shape, and an inner wall surface 23 having the same diameter and extending along the central axis J as an inner peripheral surface thereof, and an inner diameter is reduced as it approaches the tip. A conical conical surface 24 and a concave surface 25 formed in a concave shape at the bottom of the cylindrical portion. The accommodation chamber 26 in the nozzle body 22 accommodates a needle 30 as a valve body, and the conical surface 24 serves as a valve seat portion that comes into contact with the needle 30. A portion surrounded by the concave surface 25 is a sack chamber 27.

  A plurality of injection holes 28 extending from the sac chamber 27 and opening to the outer surface of the nozzle body are formed at the tip of the nozzle body 22. The injection holes 28 are provided, for example, at several or even ten locations evenly in the circumferential direction so as to extend radially from the central axis J of the fuel injection valve 20. The concave surface 25 surrounding the sac chamber 27 has a curved portion serving as a bottom portion and a side wall portion extending along the central axis J other than the bottom portion, and each nozzle hole 28 is formed in the side wall portion. ing. However, each nozzle hole 28 may be formed in the bottom (curved portion). Each injection hole 28 is provided so as to extend in a direction intersecting the central axis J, and an angle θ formed by the central axis J and the direction in which the injection hole 28 extends on the front end side in the axial direction of the fuel injection valve 20 is: It is within the range of 45 to 90 °.

  The suck chamber 27 and each nozzle hole 28 are always in communication with each other regardless of the lift state of the needle 30. The sac chamber 27 serves as a distribution chamber that distributes fuel to the injection holes 28 when the fuel injection valve 20 is opened.

  The needle 30 is accommodated in the accommodating chamber 26 in the nozzle body 22 so as to be capable of reciprocating in the axial direction. The needle 30 is disposed coaxially with the nozzle body 22. The needle 30 has a substantially cylindrical shape, and has a shaft portion 31 having the same outer diameter, and a conical cone portion 32 whose outer diameter is reduced toward the tip on the tip side of the shaft portion 31. ing.

  The conical portion 32 has two tapered portions 33 and 34 having different inclination angles with respect to the central axis J. For convenience, the taper portions 33 and 34 are also referred to as an upper taper portion 33 and a lower taper portion 34 below. The lower taper portion 34 has a larger inclination angle with respect to the central axis J than the upper taper portion 33. Compared with the inclination angle of the conical surface 24 of the nozzle body 22, the inclination angle of the upper tapered portion 33 is smaller than the inclination angle of the conical surface 24, and the inclination angle of the lower tapered portion 34 is larger than the inclination angle of the conical surface 24. Is also getting bigger. In this case, the upper end portion of the lower taper portion 34, that is, the boundary portion between the upper taper portion 33 and the lower taper portion 34 is the seat portion 34 a, and in the valve closing state shown in FIG. Sheet portion 34a abuts.

  In the valve-closed state shown in FIG. 1, a part of the tip side of the lower taper portion 34 of the needle 30 protrudes into the sac chamber 27. The tip surface 35 of the needle 30 is positioned on the tip side in the axial direction with respect to the inner opening of the injection hole 28. The tip surface 35 is a flat surface extending in a direction orthogonal to the axial direction.

  In the fuel injection valve 20, a fuel passage is formed between the inner peripheral surface of the nozzle body 22 and the outer peripheral surface of the needle 30, and a lower tapered portion 34 (seat portion) with respect to the conical surface 24 on the nozzle body 22 side. In the state where 34a) is seated, fuel injection from the nozzle hole 28 is stopped, and fuel is injected from the nozzle hole 28 as the lower tapered portion 34 (seat portion 34a) separates from the conical surface 24. Is done.

  The needle 30 has a through passage 36 extending in the axial direction thereof. That is, the lower taper portion 34 of the needle 30 has a plurality of (eight in the present embodiment) through passages 36 penetrating through the needle 30 and linearly communicating at two different positions in the axial direction. Is formed. The through passage 36 is provided in an oblique direction with respect to the central axis J. In this case, the nozzle hole 28 is provided at a position different from the extension line obtained by extending the axis of the through passage 36. The plurality of through passages 36 are each formed so as to face a predetermined range (tip surface 35) including the central axis J of the needle 30 in the axial direction of the needle 30.

  In the needle 30, a passage inlet 36 a is provided on the outer surface of the lower tapered portion 34, and a passage outlet 36 b is provided on the distal end surface 35, and a linear through passage is provided between the passage inlet 36 a and the passage outlet 36 b. 36 is formed. The inclination angle of the through passage 36 with respect to the central axis J is larger than the inclination angle of the outer surface of the lower taper portion 34. The passage inlets 36a are provided in the same number as the through passages 36, whereas the passage outlets 36b are provided in common in the respective through passages 36. As shown in FIG. 2, the through passages 36 are formed radially from the central axis J at equal intervals in the circumferential direction.

  The diameter of the through passage 36 is, for example, about 0.1 mm. The diameter of the passage outlet 36b may be the same as the diameter of the through passage 36, but may be larger than the diameter of the through passage 36. The diameter of the passage outlet 36b is, for example, about 0.2 mm.

  The passage inlet 36 a of the through passage 36 is provided on the downstream side of the seat portion 34 a and on the upstream side of the sack chamber 27. In addition, the passage inlet 36a may be provided on the upstream side of the sac chamber 27 in the valve-closed state (on the opposite side to the inlet of the sac chamber 27 in the axial direction).

  Since the passage inlet 36a is provided in the lower taper portion 34 of the tapered portions 33, 34 of the conical portion 32, inflow of fuel to the through passage 36 is prevented in the valve-closed state. The passage inlet 36 a is provided at a position facing the conical surface 24 of the nozzle body 22. In other words, the needle 30 has a facing portion facing the conical surface 24 of the nozzle body 22 in a close state from the seat portion 34a to a portion serving as the inlet of the sack chamber 27, and a passage inlet 36a is provided in the facing portion. It has been.

  Further, as described above, the tip of the needle 30 is accommodated in a state of protruding into the sac chamber 27, and a passage outlet 36 b is provided at a protruding portion of the needle 30 protruding into the sack chamber 27. In this case, in the valve-closed state, the distal end surface 35 of the needle 30 is positioned on the distal end side with respect to the inner opening portion of the injection hole 28, so that the passage outlet 36 b is similarly more distal than the inner opening portion of the injection hole 28. Located on the side. Further, in the valve-closed state, the passage outlet 36 b is provided on the tip side of the nozzle hole 28 in the axial direction of the needle 30.

  The configuration relating to the through passage 36 will be further described with reference to FIG. In FIG. 3, D <b> 1 is an outer diameter dimension of the seat portion 34 a in the needle 30. D2 is an outer diameter dimension of a portion connecting positions that are the outermost peripheral portions with respect to the passage inlet 36a of the through passage 36. D3 is the outer diameter of the entrance of the sack chamber 27.

  Here, when D1 to D3 are compared, D1> D2. Therefore, in the valve closed state, that is, in the state where the needle 30 is seated on the nozzle body 22, the inflow of fuel to the through passage 36 is prevented. Further, D2> D3. Therefore, the passage outlets 36b of the respective through passages 36 are concentrated in the vicinity of the central axis J of the needle 30, and fuel collision is likely to occur in the vicinity of the central axis J.

  Next, the state of fuel injection when the fuel injection valve 20 is opened will be described with reference to FIGS. In the fuel injection valve 20 of the present embodiment, when fuel injection is performed in accordance with the opening operation of the needle 30, the two fuels, that is, the through passage 36 of the needle 30 and the gap passage between the nozzle body 22 and the needle 30. Fuel injection is performed using a passage, and which of the two fuel passages the fuel passes through can be switched according to the lift amount of the needle 30. 4 and 5, (a) shows a state where the lift amount of the needle 30 is relatively small, and (b) shows a state where the lift amount of the needle 30 is relatively large. In other words, (a) in FIGS. 4 and 5 shows the state in the initial period of fuel injection, and (b) shows the state after the initial period of fuel injection.

  In FIG. 4A, since the lift amount of the needle 30 is small, the separation distance of the lower taper portion 34 of the needle 30 from the conical surface 24 of the nozzle body 22, that is, the nozzle body 22 and the needle 30 face each other. The gap distance between the parts is small. Therefore, the fuel flowing from the upstream side in the fuel injection valve 20 preferentially flows into the through passage 36. The fuel that has passed through the through passage 36 enters the sac chamber 27 and is injected from the injection hole 28 through the sac chamber 27.

  In this case, since the fuel enters the sac chamber 27 from the distal end surface 35 of the needle 30, the fuel does not flow directly into the injection hole 28, but once circulates in the sac chamber 27 and then the injection hole 28. Flow into. Therefore, fuel collision or stagnation occurs in the sac chamber 27, which causes disturbance in the fuel flow. In particular, the passage outlet 36 b is provided on the tip side of the nozzle hole 28 in the axial direction of the needle 30, and the nozzle hole 28 is provided at a position different from the extension line obtained by extending the axis of the through passage 36. In addition, since each through passage 36 is formed so as to face a predetermined range including the central axis J of the needle 30, a situation in which turbulence of the fuel flow in the sac chamber 27 is likely to occur is suitably created. It is like that.

  Under such circumstances, as shown in FIG. 5A, a highly dispersed spray is formed in the combustion chamber. In this case, the fuel spray can be separated from the wall surface (for example, the concave wall surface of the piston 12) in the combustion chamber, and heat escape to the wall surface can be suppressed during fuel combustion.

  4B, since the lift amount of the needle 30 is large, the separation distance of the lower taper portion 34 of the needle 30 from the conical surface 24 of the nozzle body 22, that is, the nozzle body 22 and the needle 30 are close to each other. The gap distance between the opposing parts is large. Therefore, the fuel flowing from the upstream side in the fuel injection valve 20 does not flow into the through passage 36 and passes through the gap passage between the nozzle body 22 and the needle 30. Then, the fuel flows directly into the injection hole 28 from the gap passage and is injected from the injection hole 28. In this case, the fuel flow is less likely to be disturbed in the sac chamber 27.

  Under such circumstances, as shown in FIG. 5 (b), a strongly penetrating spray is formed in the combustion chamber. In this case, the fuel spray can reach the wall surface (for example, the concave wall surface of the piston 12) in the combustion chamber, and the air (oxygen) in the combustion chamber including the air (oxygen) in the vicinity of the wall surface is effectively used during fuel combustion. It can be used up.

  4 (a) and 4 (b), the ratio of the fuel amount passing through the through passage 36 in the injected fuel amount is different, and FIG. 4 (a), that is, the lift amount of the needle 30 is smaller. However, the ratio of the fuel passing through the through passage 36 is increased. In short, in the fuel injection valve 20 configured as described above, the smaller the lift amount of the needle 30 is, the larger the proportion of the fuel that passes through the through passage 36 is. The larger the lift amount of the needle 30 is, the more the fuel that passes through the through passage 36 is. The ratio becomes smaller.

  In the fuel injection control performed by the ECU, the fuel injection amount is controlled based on the engine rotation speed and the load, and the fuel injection amount increases as the engine rotation speed increases or the load increases. When such fuel injection control is taken into account, it is conceivable that strong injection is performed because the injection pulse becomes longer in a high rotation state or a high load state. Moreover, in a low rotation state or a low load state, since the injection pulse becomes short, it is conceivable that high dispersion injection is performed.

  According to the embodiment described in detail above, the following excellent effects can be obtained.

  The fuel injection valve 20 is configured to perform fuel injection by flowing fuel through two paths when the valve is opened. In this case, one path is a path that passes through the gap between the body inner peripheral surface and the needle outer peripheral surface, and the other path is a path that passes through the through passage 36 of the needle 30. Speaking of the through passage 36, the passage inlet 36 a is provided on the downstream side of the seat portion 34 a of the needle 30 and on the upstream side of the sack chamber 27, so that the fuel flows into or does not flow into the through passage 36. This can be switched according to the lift amount of the needle 30. When the fuel flows into the sac chamber 27 via the through passage 36, fuel spray in a highly dispersed state can be formed due to the disturbance of the fuel flow in the sac chamber 27. Further, when the fuel flows into the sac chamber 27 via the gap between the inner peripheral surface of the body and the outer peripheral surface of the needle without passing through the through passage 36, a fuel spray is formed in a strongly penetrating state. be able to. As described above, it is possible to realize the fuel injection valve 20 that can suitably switch the fuel spray.

  In the needle 30, the passage inlet 36 a of the through passage 36 is provided in the opposed portion facing the inner peripheral surface (conical surface 24) of the nozzle body 22 in a close state, so that the through passage in a situation where the lift amount of the needle 30 is relatively small. Thus, the inflow of fuel to 36 can be suitably realized.

  In the needle 30, the passage outlet 36 b of the through passage 36 is provided in the protruding portion that protrudes into the sac chamber 27, so that when the fuel flows into the sac chamber 27 through the through passage 36, the fuel is in the body inner peripheral surface. The fuel flows in at a deeper position in the sac chamber 27 than in the case where it flows into the sac 27 chamber through a gap between the needle and the outer peripheral surface of the needle. Therefore, it is possible to suitably create a situation in which the turbulence of the fuel flow in the sac chamber 27 is likely to occur.

  Since the passage outlet 36b of the through passage 36 is provided on the tip side of the injection hole 28 in the axial direction of the needle 30, the fuel flowing to the sack chamber 27 side through the through passage 36 is directed to the tip side of the fuel injection valve 20. After flowing in the direction, it goes back (U-turn) toward the nozzle hole 28. Therefore, it is possible to suitably create a situation in which the turbulence of the fuel flow in the sac chamber 27 is likely to occur.

  Since the injection hole 28 is provided at a position different from the extended line obtained by extending the axis of the through passage 36, the fuel that has passed through the through passage 36 does not directly reach the injection hole 28, but is injected through the collision and retention. 28 and is injected from the injection hole 28 into the combustion chamber. Thereby, desired high dispersion spray can be realized.

  Since each through passage 36 is formed so as to face a predetermined range including the central axis J of the needle 30 in the axial direction of the needle 30, the fuel flowing to the sack chamber 27 side through each through passage 36 flows through the needle 30. It becomes easy to collide with each other in the vicinity of the central axis J. Therefore, the fuel flow is easily disturbed in the sac chamber 27, and a highly dispersed fuel spray can be suitably formed.

  In the engine using the fuel injection valve 20 configured as described above, both high dispersion characteristic spray and strong penetration characteristic spray can be realized in accordance with the operating state of the engine. As a result, it is possible to improve fuel consumption and exhaust in the engine.

(Other embodiments)
You may change the said embodiment as follows, for example.

  -The modification of the penetration passage 36 in the needle 30 is shown below. For example, in the configuration shown in FIG. 7, a passage outlet 36 b is provided for each through passage 36 as a difference from the configuration of FIG. 2 described above. Also in this case, the plurality of through passages 36 are each formed so as to face a predetermined range (tip surface 35) including the central axis J of the needle 30 in the axial direction of the needle 30. Further, the tip surface 35 of the needle 30 is not a flat surface but a conical circle. The tip surface 35 of the needle 30 may be a flat surface.

  Further, in the configuration shown in FIG. 8, as a difference from the configuration of FIG. 7, the through passages 36 are not provided at equal intervals in the circumferential direction, but are provided at unequal intervals. In FIG. 8, each through passage 36 is provided as a group of two.

  Further, in the configuration shown in FIG. 9, as a difference from the configuration of FIG. 7, the plurality of through passages 36 are provided so that an extension line obtained by extending the axis of each through passage 36 does not pass through the central axis J of the needle 30. It has been. However, all of the passage outlets 36 b are provided on the tip surface 35. In this case, the fuel flowing through the through passages 36 toward the sac chamber 27 turns in a predetermined direction (clockwise in FIG. 9B) in the sac chamber 27. Therefore, the fuel flow is easily disturbed in the sac chamber 27, and a highly dispersed fuel spray can be suitably formed.

  The plurality of through passages 36 provided in the needle 30 may not all have the same diameter, and a large diameter through passage 36 and a small diameter through passage 36 may be provided in a mixed manner. For example, the needle 30 may be provided with large-diameter through passages 36 and small-diameter through passages 36 alternately in the circumferential direction.

  In the above embodiment, the passage outlet 36b of the through-passage 36 in the needle 30 is provided on the tip side of the nozzle hole 28 in the needle axis direction, but this is changed so that the passage outlet 36b is changed to the nozzle hole in the needle axis direction. 28 may be provided at the same position as that of the nozzle hole 28 or on the opposite end side from the nozzle hole 28. In short, the passage outlet 36b may be provided in the vicinity of the nozzle hole 28 in the axial direction of the needle 30 or on the tip side of the nozzle hole 28.

  In the fuel injection valve 20 of the above-described embodiment, the conical portion 32 of the needle 30 is configured by the two tapered portions 33 and 34 having different inclination angles with respect to the central axis J. The inclination angle may be constant throughout the entire area.

  In the above embodiment, the fuel injection valve 20 is arranged at the center position of the combustion chamber 13 in the engine and the center injection is performed. However, this may be changed. For example, the fuel injection valve 20 may be disposed at a position deviated from the center position of the combustion chamber 13 and fuel injection may be performed from an oblique position of the combustion chamber 13. In such a case, in the fuel injection valve 20, the position and size of the injection hole 28 may be changed as appropriate according to the direction of spraying for each injection hole 28 while the configuration related to the through passage 36 of the needle 30 is the same.

  The fuel injection valve 20 having the above configuration can be applied to, for example, a direct injection gasoline engine in addition to the diesel engine.

  DESCRIPTION OF SYMBOLS 20 ... Fuel injection valve, 22 ... Nozzle body, 27 ... Suck chamber, 28 ... Injection hole, 30 ... Needle (valve body), 34a ... Seat part, 36 ... Through-passage, 36a ... Passage inlet.

Claims (7)

A cylindrical body (22) having a sac chamber (27) and a nozzle hole (28) extending from the sac chamber at the tip, and a valve body (30) provided in the body so as to be reciprocally movable; A fuel injection valve (20) for injecting fuel from the injection hole by separating the valve body from a state of being seated on the inner peripheral surface of the body,
The valve body has a through passage (36) extending in the axial direction thereof,
A passage inlet (36a) of the through passage is provided on the downstream side of the seat (34a) seated on the inner peripheral surface of the body in the valve body and on the upstream side of the sac chamber. Fuel injection valve. The valve body has a facing portion that faces the inner peripheral surface of the body in a proximity state from the seat portion to a portion that becomes an inlet of the sack chamber,
The fuel injection valve according to claim 1, wherein the passage entrance is provided in the facing portion. The tip of the valve body is accommodated in a state of protruding into the sac chamber,
The fuel injection valve according to claim 1 or 2, wherein a passage outlet (36b) of the through passage is provided in a protruding portion of the valve body protruding into the sac chamber.   4. The fuel injection valve according to claim 3, wherein the passage outlet is provided in the vicinity of the nozzle hole or on the tip side of the nozzle hole in the axial direction of the valve body.   The fuel injection valve according to any one of claims 1 to 4, wherein the injection hole is provided at a position different from an extension line obtained by extending an axis of the through passage. As the through passage, the valve body has a plurality of through passages arranged at predetermined intervals in the circumferential direction,
The fuel injection valve according to any one of claims 1 to 5, wherein the plurality of through passages are formed so as to face a predetermined range including a central axis of the valve body in an axial direction of the valve body. As the through passage, the valve body has a plurality of through passages arranged at predetermined intervals in the circumferential direction,
The plurality of through passages have a passage outlet (36b) for each passage, and are provided so that an extension line obtained by extending the axis of each through passage does not pass through the central axis of the valve body. The fuel injection valve according to any one of 5.

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