JP2011069292A - Fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit the moving speed of armature of a control valve from becoming unstable due to the effects of bubbles contained in a fuel discharged from a control chamber. <P>SOLUTION: In an armature 54, there is provided an armature portion low pressure flow passage 543 that directs a fuel discharged to a valve chamber 552 to end surfaces on a coil 52 and a stator 53 side in a blade portion 541. In a stator 53, there is provided a solenoid portion low pressure flow passage 531 in which one end is connected to a low pressure portion, and the other end is opened to an armature accommodating space 58, and opening portion on the coil 52 and the stator 53 side in the armature portion low pressure flow passage 543 and an opening portion on the armature accommodating space 58 side in the solenoid portion low pressure flow passage 531 face each other. Thereby, a fuel containing air bubbles pass through the armature portion low pressure flow passage 543 and the solenoid portion low pressure flow passage 531, and are discharged as it is to the outside of a fuel injection valve. That is, the fuel containing air bubbles does not pass through the surrounding of the blade portion 541 of the armature 54. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel injection valve in which a nozzle needle is driven by increasing or decreasing the pressure in a control chamber.

  Conventional fuel injection valves include a nozzle needle that opens and closes a nozzle hole for injecting fuel into an internal combustion engine, an electromagnetic control valve that controls the opening and closing operation of the nozzle needle by controlling the pressure in the control chamber, and the like. (For example, refer to Patent Document 1).

  The control valve includes a control chamber plate in which a control chamber is partitioned and a discharge passage for discharging fuel in the control chamber is formed, a solenoid that generates electromagnetic force when energized, and the like, between the control chamber plate and the solenoid, A guide plate that slidably holds the armature is disposed, and a plate-like blade portion that is a magnetic circuit component of the armature is disposed in an armature housing space formed between the solenoid and the guide plate.

  When the control valve is closed, the control chamber is maintained at a high pressure by the high-pressure fuel, and the nozzle needle is driven in the valve closing direction by the pressure in the control chamber to close the nozzle hole. Further, when the control valve is opened, the high-pressure fuel in the control chamber is released to the external low-pressure portion through the passage in the guide plate and the armature housing space, thereby reducing the pressure in the control chamber, and the nozzle needle Is driven in the valve opening direction to open the nozzle hole.

JP 2008-115738 A

  However, in the conventional fuel injection valve, since the fuel discharged from the control chamber is decompressed at once by opening the control valve, the bubbles in the discharged fuel expand, and the volume ratio of the bubbles in the discharged fuel increases. . Then, the fuel containing the bubbles passes around the blade portion of the armature, so that the volume ratio of the bubbles in the fuel changes around the blade portion, and the movement speed of the armature becomes unstable when the control valve is opened and closed. As a result, there is a problem that the injection amount varies for each injection.

  The present invention has been made in view of the above points, and an object thereof is to suppress the movement speed of an armature of a control valve from becoming unstable due to the influence of bubbles in fuel discharged from a control chamber.

  In order to achieve the above object, according to the first aspect of the present invention, a nozzle needle (2) for opening and closing a nozzle hole (12) for injecting fuel into an internal combustion engine, and a control chamber (in which high-pressure fuel is introduced) 4) and a control valve (5) for opening and closing a path for releasing the fuel in the control chamber (4) to the external low-pressure part, and the pressure in the control chamber (4) increases or decreases with the operation of the control valve (5). In the fuel injection valve in which the nozzle needle (2) is driven, the control valve (5) includes a control chamber plate (51) having a discharge passage (511) for discharging the fuel in the control chamber (4), Solenoids (52, 53) that generate an electromagnetic force when energized, an armature (54) that is attracted by the electromagnetic force, and an armature (54) that are integrated with the control chamber plate (51), are connected to and separated from the control chamber plate (51). 511) and a control chamber pre- The armature (54) is slidably held in the guide hole (551) and the fuel discharged from the discharge passage (511) flows in between the guide (51) and the solenoid (52, 53). A guide plate (55) in which the valve chamber (552) is formed at the end of the guide hole (551), and an armature housing space (58) formed between the solenoids (52, 53) and the guide plate (55). The armature (54) is located in the armature housing space (58) and has a plate-like blade portion (541) constituting a magnetic circuit, and a control chamber plate (51) from the center of the blade portion (541). ) Side and is formed continuously from the shaft portion (542) slidably inserted into the guide hole (551), the blade portion (541) and the shaft portion (542), from the discharge passage (511). Valve chamber (552) An armature part low-pressure channel (543) for guiding the discharged fuel to the end face on the solenoid (52, 53) side in the blade part (541), and one end of the solenoid (52, 53) is connected to the low-pressure part. And the other end of the solenoid unit low-pressure channel (531) that opens into the armature housing space (58) and allows the fuel to pass therethrough, and further, the solenoid (52, 53) side opening in the armature unit low-pressure channel (543) And the opening part by the side of the armature accommodation space (58) in a solenoid part low pressure flow path (531) is facing, It is characterized by the above-mentioned.

  According to this, the opening on the side of the solenoid (52, 53) in the armature section low-pressure flow path (543) and the opening on the armature accommodating space (58) side in the solenoid section low-pressure flow path (531) face each other. The bubbles in the fuel discharged from the control chamber (4) easily flow into the solenoid unit low pressure channel (531) from the armature unit low pressure channel (543).

  Therefore, the bubbles in the fuel discharged from the control chamber (4) are discharged to the outside of the fuel injection valve as they are through the armature section low pressure flow path (543) and the solenoid section low pressure flow path (531). Does not pass around the blade portion (541) of the armature (54). For this reason, it can suppress that the moving speed of an armature (54) becomes unstable by the influence of the bubble in a fuel, and can suppress the dispersion | variation in the injection amount for every injection by extension.

  According to a second aspect of the present invention, in the fuel injection valve according to the first aspect of the present invention, when mounted on the internal combustion engine, above the opening on the solenoid (52, 53) side in the armature portion low-pressure flow path (543). Further, an opening on the armature housing space (58) side in the solenoid unit low-pressure channel (531) is located.

  According to this, since the air bubbles in the fuel smoothly flow from the armature part low pressure flow path (543) to the solenoid part low pressure flow path (531), the effect of the invention of claim 1 can be obtained with certainty.

  As in the invention described in claim 3, the armature portion low-pressure flow path (543) is a through hole extending from the outer peripheral surface of the shaft portion (542) to the end surface of the blade portion (541), and the shaft portion (542) The outer diameter on the distal end side is made smaller than the outer diameter of the portion slidably held in the guide hole (551), and the shaft portion (between the armature portion low pressure flow path (543) and the valve chamber (552) is provided. 542) and the guide hole (551).

  As in the invention described in claim 4, the armature portion low-pressure flow path (543) is a through hole extending from the outer peripheral surface of the shaft portion (542) to the end surface of the blade portion (541), and the shaft portion (542) includes A shaft groove (544) is formed on the outer peripheral surface of the portion that is slidably held in the guide hole (551) so as to communicate between the armature portion low-pressure flow path (543) and the valve chamber (552). Also good.

  As in the fifth aspect of the present invention, the armature part low-pressure flow path (543) is a through hole extending from the outer peripheral surface of the shaft part (542) to the end face of the blade part (541), and the guide hole (551) has a through hole. A guide hole groove (555) that allows communication between the armature portion low-pressure channel (543) and the valve chamber (552) may be formed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is sectional drawing which shows typically the whole structure of the fuel injection valve which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of the principal part in the fuel injection valve of FIG. It is typical sectional drawing of the principal part with which it uses for operation | movement description when the control valve 5 opens in the fuel injection valve of FIG. It is typical sectional drawing of the principal part which shows the modification of 1st Embodiment. It is typical sectional drawing of the principal part in the fuel injection valve which concerns on 2nd Embodiment of this invention. FIG. 6 is a view of the armature 54 in FIG. It is typical sectional drawing of the principal part in the fuel injection valve which concerns on 3rd Embodiment of this invention. FIG. 8 is a B arrow view of the guide plate 55 alone in FIG. 7.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view schematically showing the overall structure of the fuel injection valve according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view showing the structure of the main part of the fuel injection valve of FIG. 1, and FIG. It is typical sectional drawing of the principal part with which it uses for operation | movement description when the control valve 5 opens in the fuel injection valve of this. In addition, the arrow in FIG. 1, FIG. 2 has shown the vertical direction in the state in which the fuel injection valve was mounted in the internal combustion engine.

  The fuel injection valve is attached to a cylinder head of an internal combustion engine (more specifically, a diesel engine, not shown), and injects high-pressure fuel stored in a common rail (not shown) into a cylinder of the internal combustion engine. is there.

  As shown in FIG. 1, a body 1 of a fuel injection valve ejects high-pressure fuel introduced through a high-pressure fuel passage 11 through which a high-pressure fuel supplied from a common rail flows, into a cylinder of an internal combustion engine. A nozzle hole 13 to be formed and a tapered nozzle valve seat 13 provided on the upstream side of the nozzle hole 12 are provided. The body 1 is slidably held by a nozzle needle 2 that opens and closes the nozzle hole 12 in contact with and away from the nozzle valve seat 13.

  In the nozzle needle 2, a tapered nozzle sheet portion 21, a small diameter cylindrical portion 22, a pressure receiving portion 23, a large diameter cylindrical portion 24, and a pin portion 25 are formed in order from the injection hole 12 side to the counter injection hole side. ing. The nozzle hole 12 is opened and closed when the nozzle seat portion 21 contacts and separates from the nozzle valve seat 13. The pressure of the high pressure fuel acts on the pressure receiving portion 23, and thereby the nozzle needle 2 is urged in the valve opening direction. The nozzle needle 2 is slidably and liquid-tightly held on the body 1 in the large diameter cylindrical portion 24. The nozzle needle 2 is urged toward the valve closing direction by a nozzle spring 3 disposed on the outer peripheral portion of the pin portion 25. The space in which the nozzle spring 3 is disposed is connected to a fuel tank (not shown) via a low-pressure fuel passage 14 formed in the body 1.

  An electromagnetic control valve 5 for controlling the pressure in the control chamber 4 is disposed on the side of the body 1 opposite to the injection hole. A cylindrical command piston 6 that receives the pressure of the control chamber 4 and biases the nozzle needle 2 in the valve closing direction is disposed at an intermediate portion in the axial direction of the body 1.

  As shown in FIG. 2, the body 1 includes a substantially cylindrical first body 1 a on the injection hole 12 side and a substantially cylindrical second body 1 b on the anti-injection hole side, and the first body 1 a and the second body 1 b. The body 1b is screwed.

  The first body 1a is formed with a piston guide hole 17 into which a cylindrical command piston 6 is slidably inserted. The upper space of the piston guide hole 17 is the control chamber 4, and the pressure in the control chamber 4 acts on the command piston 6.

  The control valve 5 includes a control chamber plate 51 in which a discharge passage 511 for discharging fuel from the control chamber 4 is formed, a coil 52 that forms a magnetic field when energized, a stator 53 that is excited by the coil 52 to generate electromagnetic force, and its electromagnetic An armature 54 sucked by force, a guide plate 55 that slidably holds the armature 54, a valve body 56 that is joined to the armature 54 to open and close the discharge passage 511, and a valve spring 57 that biases the armature 54 are provided. Yes. In addition, an armature housing space 58 is formed between the coil 52 and the stator 53 and the guide plate 55. The coil 52 and the stator 53 constitute a solenoid.

  The disc-shaped control chamber plate 51 is disposed above the first body 1a so as to close the piston guide hole 17, and cooperates with the first body 1a to define the control chamber 4 in a partitioned manner. The control chamber plate 51 is formed with a high-pressure introduction passage 512 that guides the high-pressure fuel from the high-pressure fuel passage 11 to the control chamber 4 and the discharge passage 511 described above.

  The armature 54 is disposed in the armature housing space 58 so as to face the lower end surfaces of the coil 52 and the stator 53, and includes a disk-shaped blade portion 541 constituting a magnetic circuit, and a radial center of the blade portion 541 And a cylindrical shaft portion 542 extending from the portion toward the control chamber plate 51 side.

  The valve body 56 is joined to the distal end portion (that is, the lower end portion) of the shaft portion 542 and integrated with the armature 54. The valve body 56 is configured to contact and separate from the control chamber plate 51 to open and close the discharge passage 511.

  A shaft guide hole 551 into which the shaft portion 542 is slidably inserted is formed in the center portion in the radial direction of the disc-shaped guide plate 55. A valve chamber 552 into which the fuel discharged from the discharge passage 511 flows is formed at the lower end of the shaft guide hole 551 in the guide plate 55. A low pressure communication hole 553 for communicating the armature accommodating space 58 and the low pressure fuel passage 14 is formed at a position shifted from the radial center of the guide plate 55.

  In the armature 54, an armature portion low-pressure channel 543 through which the fuel discharged to the valve chamber 552 passes is formed. The armature portion low-pressure channel 543 is a through hole formed continuously from the blade portion 541 and the shaft portion 542, and the end surface on the stator 53 side of the blade portion 541 from the outer peripheral surface of the shaft portion 542 (i.e., It extends to the top and bottom (upper end surface). The armature portion low-pressure flow path 543 includes a plurality of holes opened on the outer peripheral surface of the shaft portion 542 and a single hole opened on the upper end surface of the blade portion 541.

  The shaft portion 542 has an outer diameter smaller than the outer diameter of the portion slidably held in the shaft portion guide hole 551, and the space between the armature portion low pressure flow path 543 and the valve chamber 552 is The shaft portion 542 communicates with a front end side outer peripheral surface through a gap between the shaft portion guide hole 551.

  A solenoid part low-pressure channel 531 that extends in the vertical direction and allows fuel to pass therethrough is formed at the radial center of the coil 52 and the stator 53. One end of the solenoid part low-pressure channel 531 is connected to a fuel tank (not shown) as a low-pressure part, and the other end opens into the armature housing space 58.

  More specifically, the solenoid unit low-pressure channel 531 and the armature unit low-pressure channel 543 are arranged on the same axis. Therefore, the opening on the armature accommodating space 58 side in the solenoid unit low-pressure channel 531 is the armature unit low-pressure flow. It faces the coil 52 and the opening on the stator 53 side in the path 543. The opening on the armature housing space 58 side in the solenoid unit low pressure channel 531 is located above the opening on the coil 52 and stator 53 side in the armature unit low pressure channel 543.

  Next, the operation of the fuel injection valve will be described. When the drive current is supplied to the coil 52, the armature 54 and the valve body 56 are attracted by the stator 53, the discharge passage 511 is opened, and the fuel in the control chamber 4 flows into the discharge passage 511, the valve chamber 552, and the armature portion low-pressure flow. The fuel tank is returned to the fuel tank via the passage 543 and the solenoid unit low-pressure passage 531.

  As a result, the pressure in the control chamber 4 decreases, and the force that urges the nozzle needle 2 toward the valve closing direction via the command piston 6 is reduced. Therefore, the nozzle needle 2 is opened by the pressure of the fuel acting on the pressure receiving portion 23. Driven in the direction of the valve, the nozzle seat portion 21 moves away from the nozzle valve seat 13 to open the injection hole 12, and fuel is injected from the injection hole 12 into the cylinder of the internal combustion engine.

  Thereafter, when the supply of the drive current to the coil 52 is stopped, the attractive force of the stator 53 disappears, so the armature 54 and the valve body 56 are driven by the urging force of the valve spring 57 and the discharge passage 511 is closed.

  As a result, the pressure in the control chamber 4 is increased by the high-pressure fuel supplied via the high-pressure introduction passage 512, and the force for urging the nozzle needle 2 toward the valve closing direction via the command piston 6 is increased. 2 is driven in the valve closing direction, the nozzle seat portion 21 is seated on the nozzle valve seat 13, the nozzle hole 12 is closed, and fuel injection is completed.

  As described above, when the drive current is supplied to the coil 52 and the discharge passage 511 is opened, the fuel discharged from the control chamber 4 to the valve chamber 552 is decompressed, and the bubbles in the discharged fuel are expanded and discharged. The volume ratio of bubbles in the fuel increases.

  In the present embodiment, the opening on the armature accommodating space 58 side in the solenoid unit low-pressure channel 531 is opposed to the coil 52 and the opening on the stator 53 side in the armature unit low-pressure channel 543, and the solenoid unit low-pressure flow Since the opening on the side of the armature accommodating space 58 in the path 531 is located above the opening on the side of the coil 52 and the stator 53 in the armature portion low-pressure flow path 543, as shown in FIG. A large number of circles in FIG. 3 represent bubbles) smoothly flow from the armature part low-pressure channel 543 to the solenoid unit low-pressure channel 531.

  Therefore, the bubbles in the fuel discharged to the valve chamber 552 are discharged from the valve chamber 552 through the armature portion low pressure flow path 543 and the solenoid portion low pressure flow path 531 to the outside of the fuel injection valve, that is, include bubbles. The fuel does not pass around the blade portion 541 of the armature 54. Therefore, it is possible to suppress the movement speed of the armature 54 from becoming unstable due to the influence of air bubbles in the fuel, and thus it is possible to suppress variations in the injection amount for each injection.

  In addition, the conventional fuel injection valve has a configuration in which the jet of fuel discharged from the control chamber hits the blade portion of the armature, which also causes the movement speed of the armature to become unstable. In the embodiment, since the jet of the fuel discharged from the control chamber 4 does not hit the blade portion 541 of the armature 54, it is possible to more reliably suppress the movement speed of the armature 54 from becoming unstable.

  Further, as in a second embodiment and a third embodiment described later, the slidability is better than that in which a groove is formed in the sliding portion between the armature 54 and the guide plate 55.

(Modification of the first embodiment)
In the above embodiment, all of the fuel discharged from the control chamber 4 to the valve chamber 552 flows into the armature section low pressure channel 543. However, as in the modified example shown in FIG. And a low-pressure communication hole 553 are formed, and a part of the fuel discharged into the valve chamber 552 is transferred to the armature housing space 58 via the sub-low-pressure communication hole 554 and the low-pressure communication hole 553. You may make it flow. Even in this case, since most of the fuel containing bubbles passes through the armature section low-pressure channel 543, it is possible to suppress the movement speed of the armature 54 from becoming unstable.

(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 5 is a schematic cross-sectional view of the main part of the fuel injection valve according to the second embodiment of the present invention, and FIG. 6 is a view of the armature 54 alone in FIG. In the present embodiment, the configuration of the armature 54 is changed, and the other parts are the same as those in the first embodiment. Therefore, only different parts will be described.

  As shown in FIGS. 5 and 6, a shaft groove 544 extending in the vertical direction is formed on the outer peripheral surface of a portion of the shaft portion 542 of the armature 54 that is slidably held in the shaft portion guide hole 551 of the guide plate 55. Are formed (four in this example).

  One end of the shaft groove 544 communicates with a plurality of formed armature low pressure channels 543, and the other end of the shaft groove 544 communicates with the valve chamber 552. In other words, the armature portion low-pressure channel 543 and the valve chamber 552 communicate with each other via the shaft groove 544.

  In the present embodiment, the fuel containing bubbles in the valve chamber 552 flows into the armature part low pressure channel 543 through the shaft groove 544 and further passes through the armature part low pressure channel 543 and the solenoid part low pressure channel 531. It is discharged as it is outside the fuel injection valve. Therefore, it is possible to suppress the movement speed of the armature 54 from becoming unstable due to the influence of air bubbles in the fuel, and thus it is possible to suppress variations in the injection amount for each injection.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 7 is a schematic cross-sectional view of the main part of the fuel injection valve according to the third embodiment of the present invention, and FIG. In addition, since this embodiment changes the structure of the guide plate 55 and is the same as that of 1st Embodiment about others, only a different part is demonstrated.

  As shown in FIGS. 7 and 8, the shaft guide hole 551 of the guide plate 55 has a plurality of guide hole grooves 555 extending in the vertical direction from the end surface on the control chamber plate 51 side to the axial middle portion of the guide plate 55. (4 in this example) are formed.

  One end of the guide hole groove 555 communicates with a plurality of armature portion low-pressure channels 543, and the other end of the guide hole groove 555 communicates with the valve chamber 552. In other words, the armature part low-pressure channel 543 and the valve chamber 552 communicate with each other via the guide hole groove 555.

  In the present embodiment, the fuel containing bubbles in the valve chamber 552 flows into the armature part low-pressure channel 543 through the guide hole groove 555 and further passes through the armature part low-pressure channel 543 and the solenoid unit low-pressure channel 531. It is discharged as it is outside the fuel injection valve. Therefore, it is possible to suppress the movement speed of the armature 54 from becoming unstable due to the influence of air bubbles in the fuel, and thus it is possible to suppress variations in the injection amount for each injection.

(Other embodiments)
The above embodiments and modified examples can be arbitrarily combined within a feasible range.

2 Nozzle needle 4 Control chamber 5 Control valve 12 Injection hole 51 Control chamber plate 52 Coil (solenoid)
53 Stator (Solenoid)
54 Armature 55 Guide plate 56 Valve body 58 Armature accommodating space 511 Discharge passage 531 Solenoid part low pressure flow path 541 Blade part 542 Shaft part 543 Armature part low pressure flow path 551 Guide hole 552 Valve chamber

Claims (5)

A nozzle needle (2) for opening and closing a nozzle hole (12) for injecting fuel into the internal combustion engine;
A control room (4) into which high-pressure fuel is introduced;
A control valve (5) for opening and closing a path for allowing the fuel in the control chamber (4) to escape to an external low pressure section;
In the fuel injection valve in which the pressure in the control chamber (4) increases or decreases with the operation of the control valve (5) to drive the nozzle needle (2),
The control valve (5) includes a control chamber plate (51) in which a discharge passage (511) for discharging fuel in the control chamber (4) is formed, and a solenoid (52, 53) that generates electromagnetic force when energized. An armature (54) that is attracted by electromagnetic force, and a valve body (56) that is provided integrally with the armature (54) and that opens and closes the discharge passage (511) in contact with and away from the control chamber plate (51). The armature (54) is slidably held in the guide hole (551) and is disposed between the control chamber plate (51) and the solenoid (52, 53), and the discharge passage (511). A valve chamber (552) into which fuel discharged from the gas flows is formed at the end of the guide hole (551), the solenoid (52, 53), and the guide plate (55). And a armature accommodating space (58) formed between,
The armature (54) is located in the armature accommodating space (58) and has a plate-like blade portion (541) constituting a magnetic circuit, and the control chamber plate (51) from the center of the blade portion (541). ) Side and slidably inserted into the guide hole (551), the shaft portion (542), and the blade portion (541) and the shaft portion (542) are formed continuously to the discharge passage. An armature portion low pressure flow path (543) for guiding the fuel discharged from (511) to the valve chamber (552) to the end face on the solenoid (52, 53) side in the blade portion (541),
The solenoid (52, 53) includes a solenoid part low-pressure flow path (531) having one end connected to the low-pressure part and the other end opened to the armature housing space (58) to allow fuel to pass through.
Further, the opening on the solenoid (52, 53) side in the armature section low pressure channel (543) and the opening on the armature accommodating space (58) side in the solenoid section low pressure channel (531) face each other. A fuel injection valve characterized by   When mounted in the internal combustion engine, the armature housing space (58) in the solenoid low pressure channel (531) is located above the opening on the solenoid (52, 53) side in the armature low pressure channel (543). The fuel injection valve according to claim 1, wherein an opening on the side is located. The armature part low-pressure channel (543) is a through hole extending from the outer peripheral surface of the shaft part (542) to the end face of the blade part (541),
The shaft portion (542) has an outer diameter on the tip side smaller than an outer diameter of a portion slidably held in the guide hole (551), and the armature portion low-pressure flow path (543) and the The valve chamber (552) communicates with the valve chamber (552) through a gap between the outer peripheral surface on the distal end side of the shaft portion (542) and the guide hole (551). Fuel injection valve. The armature part low-pressure channel (543) is a through hole extending from the outer peripheral surface of the shaft part (542) to the end face of the blade part (541),
The shaft portion (542) communicates between the armature portion low-pressure channel (543) and the valve chamber (552) on an outer peripheral surface of a portion slidably held in the guide hole (551). The fuel injection valve according to claim 1 or 2, wherein a shaft groove (544) is formed. The armature part low-pressure channel (543) is a through hole extending from the outer peripheral surface of the shaft part (542) to the end face of the blade part (541),
The guide hole (551) is formed with a guide hole groove (555) for communicating between the armature portion low pressure flow path (543) and the valve chamber (552). Or the fuel injection valve of 2.

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