JP6544416B2 - Fuel injection valve - Google Patents

Description

  The present invention relates to a fuel injection valve that injects and supplies a fuel to an internal combustion engine (hereinafter referred to as an "engine").

  Conventionally, there is known a fuel injection valve in which a needle and a movable core are provided to form a gap between the needle and a movable core that opens and closes an injection hole formed in the housing when fuel is not injected. In the fuel injection valve, in addition to the magnetic attraction force generated between the fixed core and the movable core, the needle is moved in the valve opening direction by an impact at the time of collision of the movable core having a certain speed by moving the gap. Thus, relatively high pressure fuel can be injected without increasing the magnetic attraction force. For example, Patent Document 1 discloses a fuel including a spring that biases the needle and the movable core to form a gap between the needle and the movable core, and a sleeve that forms an accommodation space for accommodating the spring as the movable core. The injection valve is described.

Patent No. 4243610

  In the fuel injection valve described in Patent Document 1, the sleeve is formed of a separate member from the movable core. The sleeve is formed with a through hole through which the needle is inserted together with the movable core. For this reason, when assembling the movable core and the sleeve, if the central axis of the movable core and the central axis of the sleeve deviate, the sliding of the fuel injection valve housing and the movable core which accommodates the movable core in a reciprocating manner is biased. Will occur. The other end of the spring whose one end abuts on the needle abuts on the pedestal of the sleeve. For this reason, when the portion to be welded to the movable core of the sleeve and the pedestal portion of the sleeve are assembled non-parallel, the movable core and the needle come into partial contact at the time of valve opening. When the fuel injection pressure becomes high, abnormal wear may occur in the movable core or the needle due to the deviation of the sliding or the abutment.

  The present invention has been made in view of the above-described point, and an object thereof is to provide a fuel injection valve which improves the durability while increasing the injection pressure of the fuel.

The present invention relates to a fuel injection valve, the housing (20) having a nozzle hole (31), a needle (41, 71) having one end open and close the injection hole, the movable member (51 provided radially outwardly of the needle, 61), fixed core (33), coil (35) for generating magnetic attraction between movable member and fixed core when energized, first biasing member (24), first regulating portion ( 42, 72) ), A first pedestal ( 43, 73), a second pedestal ( 52, 62), a second regulating member (45, 75), and a second biasing member (26).
The first biasing member biases the needle in the valve closing direction so as to abut the valve seat. The first restricting portion is provided on the needle , and restricts relative movement of the needle in the valve closing direction with respect to the movable member when the first restricting portion abuts on the movable member. The first pedestal is provided on the needle . The second pedestal is provided on the injection hole side of the first pedestal so as to be movable relative to the needle . The second stop member, provided on the injection hole side of the second pedestal as relative immovable with respect to the needle, restricting relative movement of the injection side when the second pedestal abuts against the needle of the second pedestal It is possible. The second biasing member is provided between the first pedestal and the second pedestal, urges the first pedestal及 beauty second pedestal to the first pedestal and the second pedestal is separated Do.
In the fuel injection valve of the present invention, the second pedestal portion is integrally formed with the movable member, and is provided closer to the injection hole than the end face of the movable member on the fixed core side. When the second pedestal portion and the second regulating member abut, a gap is formed between the first regulating portion and the movable member. The movable member is provided slidably with the needle. A cylindrical fuel flow passage (502 , 502) in which fuel can flow to the injection hole side in a state where the second pedestal portion and the second regulating member are in contact between the first pedestal portion and the second pedestal portion . 602 ) is formed. A communication passage (503) through which fuel can flow is formed between the fuel flow passage and the end face of the movable member on the side of the injection hole in a state where the second pedestal portion and the second restriction member are in contact with each other. .

In the fuel injection valve of the present invention , when the second pedestal portion and the second regulation member abut, a gap is formed between the first regulation portion provided so as not to be able to move relative to the needle and the movable member. It is formed. When the injection hole is opened, the movable member collides with the first restricting portion after moving the length corresponding to the gap by the magnetic attraction force generated between the movable member and the fixed core. As a result, the movable member abuts the first restricting portion at a certain speed, so in addition to the magnetic attraction force acting on the needle between the movable member and the fixed core, at the time of collision of the movable member having a certain speed. An impact acts. Therefore, the fuel injection valve of the present invention can increase the injection pressure of the fuel without increasing the magnetic attraction force.

Further, in the fuel injection valve of the present invention, the second pedestal portion on which the biasing force of the second biasing member acts is integrally formed with the movable member. Accordingly, it is possible to accurately provide the second biasing member that biases the first pedestal portion provided so as not to move relative to the movable member and the needle that collide with the first restricting portion . Therefore, in the inside of the housing in which high-pressure fuel stagnates, it is possible to prevent the occurrence of the sliding displacement between the housing and the movable member and the occurrence of the abutment between the movable member and the needle. Therefore, the fuel injection valve of the present invention can improve the durability while increasing the fuel injection pressure.

1 is a cross-sectional view of a fuel injection valve according to a first embodiment of the present invention. It is the II section enlarged view of FIG. It is sectional drawing explaining the effect | action of the fuel injection valve by 1st embodiment of this invention. It is principal part sectional drawing of the fuel injection valve by 2nd embodiment of this invention. It is principal part sectional drawing of the fuel injection valve by 3rd embodiment of this invention.

  Hereinafter, a plurality of embodiments of the present invention will be described based on the drawings.

First Embodiment
A fuel injection valve 1 according to a first embodiment of the present invention is shown in FIGS. Note that FIG. 1 illustrates a valve opening direction in which the needle 40 is separated from the valve seat 304 and a valve closing direction in which the needle 40 is in contact with the valve seat 304.

  The fuel injection valve 1 is used, for example, in a fuel injection device of a direct injection type gasoline engine (not shown), and injects and supplies gasoline as a fuel to the engine. The fuel injection valve 1 includes a housing 20, a needle 40, a movable core 50, a fixed core 33, a coil 35, a spring 24 as a "first biasing member", and a spring 26 as a "second biasing member".

  The housing 20 is comprised from the 1st housing member 21, the 2nd housing member 22, the 3rd housing member 23, and the injection | spray nozzle 30, as shown in FIG. The first housing member 21, the second housing member 22 and the third housing member 23 are all formed in a substantially cylindrical shape, and are coaxial in the order of the first housing member 21, the second housing member 22 and the third housing member 23. Arranged and connected to each other.

  The first housing member 21 and the third housing member 23 are subjected to magnetic stabilization processing. The first housing member 21 and the third housing member 23 have relatively low hardness. On the other hand, the hardness of the second housing member 22 is higher than the hardness of the first housing member 21 and the third housing member 23.

  The injection nozzle 30 is provided at the end of the first housing member 21 opposite to the second housing member 22. The injection nozzle 30 is welded to one end of the first housing member 21. The injection nozzle 30 is subjected to a hardening process so as to have a predetermined hardness. The injection nozzle 30 is formed of an injection unit 301 and a cylinder unit 302.

  The injection unit 301 is formed in line symmetry with the central axis CA0 of the housing 20 as the axis of symmetry. A plurality of injection holes 31 communicating the inside and the outside of the housing 20 are formed in the injection unit 301. An annular valve seat 304 is formed at an edge of an inner opening which is an opening on the inner side of the housing 20 of the injection hole 31.

  The cylindrical portion 302 is connected to the radially outer side of the injection portion 301, and extends in the opposite direction to the direction in which the outer wall 303 of the injection portion 301 protrudes. The end of the cylindrical portion 302 opposite to the side connected to the injection portion 301 is connected to the first housing member 21.

  The needle 40 is formed of a metal which is subjected to a hardening process so as to be substantially equal to the hardness of the injection nozzle 30. The needle 40 is housed inside the housing 20. The needle 40 is formed of a main body portion 41 as a "bar-like member", a first restricting portion 42 as a "first restricting member", a first pedestal 43 as a "first pedestal member", a second restricting member 45 and the like. It is done. In the needle 40, the main body portion 41, the first restricting portion 42, and the first pedestal portion 43 are integrally formed, and the second restricting member 45 is provided separately from the main body portion 41.

The main body portion 41 is formed in a rod shape so as to extend in the central axis CA0 direction. The main body portion 41 has a seal portion 411 and a sliding contact portion 412 at an end portion on the injection hole 31 side as “one end”.
The seal portion 411 is provided to be able to abut on the valve seat 304. When the seal portion 411 is separated from the valve seat 304 or abuts on the valve seat 304, the injection hole 31 is opened and closed, and the inside and the outside of the housing 20 are communicated or blocked.
The sliding contact portion 412 is formed on the opposite side of the seal portion 411 to the injection hole 31 side. The sliding contact portion 412 is formed in a substantially cylindrical shape, and a part of the outer wall is chamfered. The non-chamfered portion of the outer wall of the sliding contact portion 412 can be in sliding contact with the inner wall of the injection nozzle 30. As a result, the reciprocating movement of the needle 40 at the tip end on the valve seat 304 side is guided.

  Further, the main body portion 41 has a needle fuel passage 413 as a "first fuel passage" at an end opposite to the injection hole 31 as the "other end" and a communication hole as a "second fuel passage". It has 414. The needle fuel passage 413 is a space on the opposite side to the injection hole 31 side of the main body portion 41 and is formed to communicate with the inside of the fixed core 33. The communication hole 414 is in the radial direction outside of the main body portion 41 and communicates the through hole 502 as the “fuel flow path” of the movable core 50 with the needle fuel passage 413. The cross-sectional area of the communication hole 414 is larger than the cross-sectional area of the injection hole 31 and the cross-sectional area of the core fuel passage 503 as a “communication passage” described later.

  The first restricting portion 42 is an annular portion provided radially outward of the end portion of the main body portion 41 opposite to the injection hole 31 side so as not to move relative to the main body portion 41. The first restricting portion 42 is formed such that the outer diameter is larger than the outer diameter of the main body portion 41, the outer diameter of the first pedestal portion 43, and the inner diameter of the through hole 502 of the movable core 50. The end surface 421 of the first restricting portion 42 on the injection hole 31 side can be in contact with the end surface 501 of the movable core 50 on the fixed core 33 side.

  The first pedestal portion 43 is an annular portion provided between the end portion of the main body portion 41 on the opposite side to the injection hole 31 side and the first restricting portion 42 so that relative movement with respect to the main body portion 41 is not possible. It is. The first pedestal portion 43 is formed to have an outer diameter larger than the outer diameter of the main body portion 41. The radially outer wall 432 of the first pedestal 43 is formed slidably on the inner wall of the movable core 50 forming the through hole 502. One end of a spring 26 described later is in contact with the first pedestal 43.

  The second restriction member 45 is provided on the radially outer side of the main body portion 41 and on the injection hole 31 side of the second pedestal portion 52 of the movable core 50. The second restriction member 45 is formed in an annular shape, and is fixed to the radial outer wall of the main body portion 41 by, for example, welding or the like. The second restricting member 45 can abut on the second pedestal 52.

  The movable core 50 is formed in a substantially cylindrical shape, and is subjected to magnetic stabilization processing. The hardness of the movable core 50 is relatively low and substantially equal to the hardness of the first housing member 21 and the third housing member 23. The movable core 50 is formed of a movable portion 51 as a “movable member”, a second pedestal 52 as a “second pedestal member”, and the like. In the movable core 50, the movable portion 51 and the second pedestal 52 are integrally formed.

  The movable portion 51 is formed in a substantially cylindrical shape. A through hole 502 is formed substantially at the center of the movable portion 51 in the axial direction. In the through hole 502, the main body 41 is inserted and the spring 26 is accommodated.

  Further, in the movable portion 51, a core fuel passage 503 communicating with the through hole 502 inside the movable portion 51 is formed. The core fuel passage 503 communicates with the through hole 502 through the opening 504 formed in the inner wall of the movable portion 51 forming the through hole 502. Further, the core fuel passage 503 is an internal portion which is an inside of the first housing member 21 formed on the injection hole 31 side of the movable core 50 through the opening 505 formed on the end surface 506 of the movable portion 51 on the injection hole 31 side. It communicates with the space 210. The cross sectional area of the core fuel passage 503 is larger than the cross sectional area of the injection hole 31.

  The second pedestal portion 52 is an inner wall of the movable portion 51 forming the through hole 502 and is provided on the inner wall on the injection hole 31 side. The second pedestal 52 is formed in a substantially annular shape. The second pedestal 52 has a through hole 521 formed so that the inner diameter is smaller than the inner diameter of the through hole 502. The main body 41 is inserted into the through hole 521.

  The fixed core 33 is formed in a substantially cylindrical shape, and is subjected to a magnetic stabilization process. The hardness of the fixed core 33 is substantially equal to the hardness of the movable core 50, but in order to secure the function of the movable core 50 as a stopper, for example, chromium plating is applied to the surface to secure the necessary hardness. The fixed core 33 is welded to the third housing member 23 of the housing 20 and fixed to the inside of the housing 20.

  The coil 35 is formed in a substantially cylindrical shape, and is provided to surround mainly the radially outer side of the second housing member 22 and the third housing member 23. The coil 35 generates a magnetic force when power is supplied.

  The spring 24 is provided such that one end thereof abuts on the end surface 401 of the main body 41, the first restricting portion 42 or the first pedestal portion 43 opposite to the injection hole 31 side. The other end of the spring 24 abuts on one end face of the adjusting pipe 11 press-fitted and fixed to the inside of the fixed core 33. The spring 24 has a force extending in the central axis CA0 direction. Thus, the spring 24 biases the needle 40 in the direction of the valve seat 304, that is, in the valve closing direction.

  The spring 26 is provided on the radially outer side of the main body portion 41. One end of the spring 26 is in contact with an end surface 522 of the second pedestal 52 opposite to the injection hole 31 side. The other end of the spring 26 is in contact with an end face 431 of the first pedestal 43 on the injection hole 31 side. The spring 26 has an axially extending force. Thereby, the spring 26 biases the first pedestal 43 and the second pedestal 52 such that the first pedestal 43 and the second pedestal 52 are separated. That is, the spring 26 biases the needle 40 and the movable core 50 apart.

  In the present embodiment, the biasing force of the spring 24 is set larger than the biasing force of the spring 26. Thus, in a state where power is not supplied to the coil 35, the seal portion 411 of the needle 40 is a valve due to the difference in biasing force between the spring 24 and the spring 26 and the pressure of the fuel inside the first housing member 21. A state in which the seat 304 abuts, that is, a valve closing state is established.

  A substantially cylindrical fuel introduction pipe 12 is provided at an end of the third housing member 23 opposite to the second housing member 22. A filter 13 is provided inside the fuel introduction pipe 12. The filter 13 collects foreign matter contained in the fuel flowing from the inlet 14 of the fuel introduction pipe 12.

  The radially outer sides of the fuel introduction pipe 12 and the third housing member 23 are molded with resin. A connector 15 is formed on the mold portion. The connector 15 is insert-molded with a terminal 16 for supplying power to the coil 35. Moreover, the cylindrical holder 17 is provided in the radial direction outer side of the coil 35 so that the coil 35 may be covered.

  Next, the operation of the fuel injection valve 1 will be described with reference to FIGS. FIG. 2 shows a state in which the second pedestal 52 and the second restricting member 45 are in contact with each other. FIG. 3 shows a state in which the first restricting portion 42 and the movable portion 51 are in contact with each other.

  In the fuel injection valve 1, the seal portion 411 is in contact with the valve seat 304 when power is not supplied to the coil 35. At this time, as shown in FIG. 2, the second pedestal 52 and the second restricting member 45 are in contact with each other. A gap 200 is formed between the end surface 501 of the movable core 50 and the end surface 421 of the first restricting portion 42.

  When power is supplied to the coil 35, a magnetic field is generated around the coil 35, and a magnetic circuit is formed inside the fixed core 33, the movable core 50, the first housing member 21, and the third housing member 23. As a result, a magnetic attraction force is generated between the fixed core 33 and the movable core 50 to move the movable core 50 in the valve opening direction.

  When the magnetic attraction force generated between the fixed core 33 and the movable core 50 becomes larger than the biasing force of the spring 26, the movable core 50 moves in the valve opening direction. The movable core 50 is pulled by the magnetic attraction between the fixed core 33 and the movable core 50 by a distance corresponding to the length of the gap 200 in the central axis CA 0 direction, and thus collides with the first restricting portion 42 at a certain speed. Do. Thereby, a force (hereinafter referred to as “impact force”) by impact when the movable core 50 moving at a certain speed collides with the main body portion 41 integrally formed with the first restricting portion 42, and The sum of the magnetic attraction forces generated between the fixed core 33 and the movable core 50 acts in the valve opening direction. In the needle 40 when the seal portion 411 is in contact with the valve seat 304, the area on the radially inner side of the portion where the seal portion 411 and the valve seat 304 are in contact and the fuel in the first housing member 21 The force corresponding to the product of the pressure and the pressure (hereinafter referred to as "fuel pressure") and the biasing force of the spring 24 act in the valve closing direction. If the sum of the impact force and the magnetic attraction force is larger than the sum of the fuel pressure and the biasing force of the spring 24, the needle 40 moves in the valve opening direction, and the seal portion 411 separates from the valve seat 304. As a result, the fuel staying inside the first housing member 21 is injected and supplied from the injection holes 31 to the combustion chamber of the engine.

  After the desired amount of fuel is injected and supplied to the combustion chamber, the supply of power to the coil 35 is stopped, and the magnetic field around the coil 35 disappears. When the magnetic field disappears around the coil 35, the magnetic attraction between the fixed core 33 and the movable core 50 disappears, and the movable core 50 moves in the valve closing direction together with the needle 40 by the biasing force of the spring 24. When the seal portion 411 abuts on the valve seat 304, the movement of the needle 40 in the valve closing direction is stopped. On the other hand, the movable core 50 which has moved in the valve closing direction together with the needle 40 further moves in the valve closing direction by inertia. At this time, part of the fuel in the internal space 210 is pushed out to the inside of the fixed core 33 through the core fuel passage 503, the communication hole 414, and the needle fuel passage 413 by the movement of the movable core 50 in the valve closing direction. The second pedestal portion 52 abuts on the second restricting member 45 while the movable core 50 gradually reduces the moving speed in the valve closing direction by the damper effect of the fuel retained in the internal space 210.

  In the fuel injection valve 1 according to the first embodiment, when the second pedestal portion 52 integrally formed with the movable portion 51 abuts on the second regulating member 45, the end face 421 of the first regulating portion 42 and the movable core 50 A gap 200 is formed between the end face 501 of the The gap 200 is a running distance for the movable core 50 to have a certain speed when the movable core 50 is moved in the valve opening direction by the magnetic attraction force with the fixed core 33. When the movable core 50, which is pulled by the magnetic attraction force for a distance corresponding to the axial length of the gap 200, collides with the first restricting portion 42 at a certain speed, the movable core 50 is fixed to the needle 40 with the fixed core 33. In addition to the magnetic attraction force between them, the above-mentioned impact force acts in the valve opening direction. Thereby, even if the fuel inside the first housing member 21 is at a relatively high pressure and the fuel pressure is relatively large, the needle 40 is separated from the valve seat 304 without increasing the magnetic attraction force so much that the injection hole 31 is It can be opened. Therefore, the fuel injection valve 1 can inject relatively high pressure fuel.

  Further, in the fuel injection valve 1 according to the first embodiment, since the second pedestal 52 is integrally formed with the movable portion 51, the second pedestal 52 can be provided on the movable portion 51 with high accuracy. Thereby, it is possible to prevent the occurrence of the sliding deviation between the movable core 50 and the housing 20 and the partial contact between the movable core 50 and the needle 40 in the housing 20 in which the high pressure fuel is accumulated. Therefore, the fuel injection valve 1 can improve the durability while increasing the injection pressure of the fuel.

  Further, the fuel injection valve 1 can reduce the number of parts constituting the fuel injection valve 1 as compared to the case where the second pedestal member is formed of a member different from the movable member. Thereby, the manufacturing cost of the fuel injection valve 1 can be reduced.

  Generally, when the fuel injection valve in which the needle and the movable core are formed as separate members close, after the needle abuts on the valve seat, the movable core is moved in the valve closing direction by inertia. When the moving speed of the movable core due to this inertia is high, the movable core collides with the inner wall on the injection hole side of the housing and then moves again in the valve opening direction. If the movable core moving again in the valve opening direction collides with the needle, the needle may be separated from the valve seat, and unintended fuel injection may be performed.

  A needle fuel passage 413 and a communication hole 414, which communicate the inside of the fixed core 33 with the through hole 502, are formed in the main body portion 41 of the needle 40 of the fuel injection valve 1. Further, in the movable core 50, a core fuel passage 503 is formed, which communicates the through hole 502 with the internal space 210. The needle fuel passage 413, the communication hole 414, and the core fuel passage 503 communicate the inside of the fixed core 33 with the inside of the first housing member 21, and bring the fuel introduced from the inlet 14 to the vicinity of the seal portion 411. Lead. The needle fuel passage 413, the communication hole 414, and the core fuel passage 503 fix the fuel of the internal space 210 appropriately by the movement of the movable core 50 in the valve closing direction when the fuel injection valve 1 is closed. Return to the inside of 33. At this time, the moving speed of the movable core 50 in the valve closing direction can be gradually reduced by the damper effect of the fuel in the internal space 210. As a result, after the movable core 50 moving in the valve closing direction abuts on the second regulating member 45, it is moved in the valve closing direction again to collide with the needle 40 and prevent the needle 40 from separating from the valve seat 304 Do. Therefore, it is possible to prevent unintended fuel injection from being performed.

  Further, the gap 200, which is an approach distance for the movable core 50 to have a certain speed at the time of valve opening, is between the end surface 501 of the movable core 50 and the end surface 421 of the first restricting portion 42 and outside the movable core 50. Provided in Thus, the axial length of the gap 200 can be adjusted at the time of assembly as compared with the case where a space having the same effect as the gap 200 is formed by the plurality of members inside the movable core 50. Therefore, the fuel injection valve 1 can perform desired on-off valve operation.

Second Embodiment
Next, a fuel injection valve according to a second embodiment of the present invention will be described based on FIG. The second embodiment differs from the first embodiment in that a cylindrical member is provided between the movable member and the second pedestal member. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 1st embodiment, and description is abbreviate | omitted.

  In the fuel injection valve 2 according to the second embodiment, the movable core 60 includes the movable portion 61 as a "movable member", the second pedestal portion 62 as a "second pedestal member", and the cylindrical portion 63 as a "tubular member" It is formed of In the movable core 60, the movable portion 61, the second pedestal member 62, and the cylindrical portion 63 are integrally formed.

  A through hole 602 as a “fuel flow passage” is formed substantially at the center of the movable portion 61 in the axial direction. The body portion 41 is inserted into the through hole 602 and the spring 26 is accommodated.

  The cylindrical portion 63 is formed to extend in the valve closing direction from an edge portion which is an end face 606 of the movable portion 61 on the injection hole 31 side and which forms an opening on the injection hole 31 side of the through hole 602. The cylindrical portion 63 internally includes an internal space 631 having the same inner diameter as the through hole 602. The spring 26 is accommodated in the internal space 631. A core fuel passage 632 as a “communication passage” is formed in a direction substantially perpendicular to the axial direction of the cylindrical portion 63. The core fuel passage 632 communicates the internal space 631 with the internal space 210.

  The second pedestal 62 is provided at an end of the cylinder 63 opposite to the side connected to the movable member 61. The second pedestal portion 62 is formed in a substantially annular shape, and is provided so as to be able to abut on the second regulating member 45. The other end of the spring 26 is in contact with an end surface 622 on the inner space 631 side of the second pedestal portion 62.

  In the fuel injection valve 2 according to the second embodiment, a gap 200 is formed between the end face 601 of the movable core 60 on the fixed core 33 side and the end face 421 of the first restricting portion 42. Thereby, the fuel injection valve 2 by 2nd embodiment can have an effect of 1st embodiment.

  Further, in the fuel injection valve 2, the first pedestal portion 43 is formed longer than in the first embodiment. Most of the first pedestal portion 43 is inserted into the through hole 602, and the movable outer wall 432 of the first pedestal portion 43 forms the through hole 602 when the needle 40 reciprocates relative to the movable core 60. It slides on the inner wall of the core 60. In the fuel injection valve 2 according to the second embodiment, the sliding length of the outer wall 432 and the inner wall of the movable core 60 forming the through hole 602 can be made longer than in the first embodiment. Thus, the fuel injection valve 2 according to the second embodiment can stably perform the relative motion between the movable core 60 and the needle 40.

  In the fuel injection valve 2, the spring 26 is accommodated in the internal space 631 and the through hole 602. Thereby, since the expansion-contraction movement of the spring 26 is guided by the inner wall of the cylinder member 63 and the inner wall of the movable portion 61, the spring 26 can operate stably.

Third Embodiment
Next, a fuel injection valve according to a third embodiment of the present invention will be described based on FIG. The third embodiment differs from the second embodiment in the configurations of the first restricting member, the second restricting member, and the first seat member. In addition, the same code | symbol is attached | subjected to the site | part substantially the same as 2nd embodiment, and description is abbreviate | omitted.

  In the fuel injection valve 3 according to the third embodiment, the needle 70 includes the main body 71 as a "bar-like member", the first restricting portion 72 as a "first restricting member", and the first pedestal as a "first pedestal member" It is formed of a portion 73 and the like. In the fuel injection valve 3, the main body 71 and the first restricting portion 72 and the first seat portion 73 are formed of separate members. A member in which the first restricting portion 72 and the first pedestal portion 73 are integrally formed is referred to as a cylindrical member 74.

The main body portion 71 is formed in a substantially rod shape. The main body portion 71 has a seal portion capable of coming into contact with the valve seat 304 at the end on the side of the injection hole 31 as the “one end”, and a sliding portion where the unchamfered portion of the outer wall is in sliding contact with the inner wall of the injection nozzle 30 It has a contact.
A second restricting portion 75 is provided radially outside the main body portion 71 and on the injection hole 31 side of the second pedestal member 62. The second restricting portion 75 is formed in an annular shape and integrally formed with the main body portion 71. The second restricting portion 75 can abut on the second pedestal member 62.

  Further, the main body portion 71 has a needle fuel passage 713 as a "first fuel passage" and a communication hole as a "second fuel passage" at an end opposite to the injection hole 31 as the "other end". It has 714. The needle fuel passage 713 is a space on the opposite side to the injection hole 31 side of the main body 71 and is formed to communicate with the inside of the fixed core 33. The communication hole 714 communicates with the needle fuel passage 713 and the through hole 602 of the movable core 60 on the radially outer side of the main body 71.

  The cylindrical member 74 is provided on the radially outer side of the end of the main body 71 opposite to the injection hole 31 so as not to be movable relative to the main body 71.

  The first restricting portion 72 is formed on the radially outer side of the cylindrical member 74. The first restricting portion 72 is formed so that the outer diameter is larger than the outer diameter of the main body portion 71 and the outer diameter of the first pedestal portion 73. An end face 721 of the first restricting portion 72 on the injection hole 31 side can be in contact with an end face 601 of the movable core 60 on the fixed core 33 side.

The first pedestal portion 73 is formed radially inward of the cylindrical member 74. The first pedestal portion 73 is formed so that the outer diameter is larger than the outer diameter of the main body portion 71. The radially outer wall 732 of the first pedestal portion 73 is formed slidably on the inner wall of the movable core 60 forming the through hole 602. The other end of the spring 26 is in contact with the end surface 731 of the first pedestal portion 73 on the injection hole 31 side.
The first pedestal portion 73 has a through hole 733 in which the end of the main body 71 opposite to the injection hole 31 is inserted. When manufacturing the fuel injection valve 3, the main body 71 is inserted into the through hole 602 from the injection hole 31 side. The cylindrical member 74 is inserted between the movable core 60 and the main body 71 from the side opposite to the injection hole 31 side, and is fixed to the main body 71 by welding or the like, for example.

  In the fuel injection valve 3 according to the third embodiment, the second restricting member 75 is integrally formed with the main body portion 71, while the first restricting portion 72 and the first pedestal portion 73 are provided separately from the main body portion 71. . The fuel injection valve 3 according to the third embodiment has the same effect as that of the second embodiment.

(Other embodiments)
(A) In the first embodiment and the two embodiments, the first restricting portion and the first pedestal portion are integrally formed with the main body portion. In the third embodiment, the first restricting portion and the first pedestal portion are integrally formed, and are formed separately from the main body portion. However, the configurations of the main body portion, the first restricting portion, and the first pedestal portion are not limited to this. The main body portion, the first pedestal portion, and the first restricting portion may all be formed of separate members. In addition, the main body portion and the first pedestal portion may be integrally formed, and the first restricting portion may be formed as a single member from another member. The main body portion, the first pedestal portion, and the first restricting portion may be formed so as not to move relative to each other.

(A) In the above-described embodiment, the needle fuel passage, the communication hole, and the core fuel passage that communicate the inside of the fixed core with the internal space of the first housing member are provided. However, the needle fuel passage, the communication hole, and the core fuel passage may not be provided.
Further, the cross-sectional area of the core fuel passage is larger than the cross-sectional area of the injection hole and smaller than the cross-sectional area of the communication hole. However, the relationship between the cross-sectional areas of the core fuel passage, the injection holes, and the communication holes is not limited to this.

  As described above, the present invention is not limited to such an embodiment, and can be implemented in various forms without departing from the scope of the invention.

1, 2, 3 ... fuel injection valve,
20 ・ ・ ・ Housing,
24 · · · Spring (first biasing member),
25 · · · Spring (second biasing member),
304 ・ ・ ・ The valve seat,
31 ··· Injection hole,
33 · · · Fixed core,
35 · · · coil,
41, 71 ・ ・ ・ main body (rod-like member),
42, 72 ・ ・ ・ first regulation part (first regulation member),
43, 73 ・ ・ ・ First pedestal (first pedestal member),
45 · · · second regulating member 51, 61 · · · movable portion (movable member)
52, 62 ・ ・ ・ second pedestal (second pedestal member),
75 ··· Second restricting portion (second restricting member).

Claims (4)

A cylindrical housing (20) having an injection hole (31) formed at one end in the direction of the central axis (CA0) and injecting fuel, and a valve seat (304) formed around the injection hole;
A needle (41, 71) one end of which opens and closes the injection hole;
Is formed in a cylindrical shape, a movable member (51, 61) provided on the radially outer side of the needle relatively movable manner with respect to said needle,
A fixed core (33) fixed to the opposite side to the injection hole side of the movable member in the housing;
A coil (35) that generates a magnetic attraction between the movable member and the fixed core when energized;
A first biasing member (24) biasing the needle in a valve closing direction so that the needle abuts on the valve seat;
Provided on the needle, the first regulation portion for regulating the relative movement in the closing direction with respect to the movable member and the movable member of the needle and contacts the (42, 72),
A first pedestal ( 43, 73) provided on the needle ;
Second seat portion provided on the injection side of the needle with respect to relatively movable so that the first pedestal part (52, 62),
Provided on the injection side of the needle with respect to the relative immovable as the second pedestal, the relative movement of the said injection side said the second base portion and abuts against the needle of the second pedestal A second restricting member (45, 75) which can be restricted;
It provided between the second seat portion and the first pedestal, biasing the first seat portion及 beauty the second pedestal to said first pedestal and the second pedestal is separated A second biasing member (26),
Equipped with
The second pedestal portion is integrally formed with the movable member, and is provided closer to the injection hole than an end face of the movable member on the stationary core side.
When the second pedestal portion and the second regulating member abut, a gap is formed between the first regulating portion and the movable member,
The movable member is provided slidably with the needle.
A cylindrical fuel capable of flowing fuel to the injection hole side in a state in which the second pedestal portion and the second regulating member are in contact between the first pedestal portion and the second pedestal portion. A flow path (502 , 602 ) is formed ,
A communication passage (503) through which fuel can flow in a state in which the second pedestal portion and the second restriction member are in contact between the fuel flow passage and the end face of the movable member on the injection hole side The fuel injection valve that is being formed .   2. The fuel injection valve according to claim 1, wherein the opening on the fixed core side of the fuel flow passage is formed to overlap with the inside of the fixed core through which fuel can flow in a direction along the central axis. Wherein the first at least one restricting portion及 beauty the first pedestal, the fuel injection valve according to claim 1 or 2 is formed on the needle integrally. The fuel injection valve according to any one of claims 1 to 3 , wherein the first restricting portion is formed separately from the needle .

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