WO2016042847A1 - Fuel injection valve - Google Patents

Fuel injection valve Download PDF

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Publication number
WO2016042847A1
WO2016042847A1 PCT/JP2015/065002 JP2015065002W WO2016042847A1 WO 2016042847 A1 WO2016042847 A1 WO 2016042847A1 JP 2015065002 W JP2015065002 W JP 2015065002W WO 2016042847 A1 WO2016042847 A1 WO 2016042847A1
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WO
WIPO (PCT)
Prior art keywords
fuel
valve
fuel injection
valve seat
injection valve
Prior art date
Application number
PCT/JP2015/065002
Other languages
French (fr)
Japanese (ja)
Inventor
貴博 齋藤
稔 兵藤
小林　信章
昭宏 山▲崎▼
一樹 吉村
Original Assignee
日立オートモティブシステムズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Priority to CN201580037759.XA priority Critical patent/CN106489023A/en
Publication of WO2016042847A1 publication Critical patent/WO2016042847A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for

Definitions

  • the present invention relates to a fuel injection valve that injects fuel.
  • Patent Document 1 a fuel injection valve described in Japanese Patent Application Laid-Open No. 2004-285923 (Patent Document 1) is known.
  • the fuel injection valve described in Patent Document 1 is a flat fuel diffusion that spreads radially outward from the outer edge of the valve seat hole between the valve seat member and the injector plate fixed to the tip surface of the valve seat member.
  • an annular step portion is formed on the ceiling surface of the fuel diffusion chamber to sequentially reduce the height of the ceiling surface in the radially outward direction.
  • Fuel injection holes are arranged away from the inner peripheral wall of the diffusion chamber, and fuel that spreads radially in the fuel diffusion chamber collides with the annular step portion to enhance the fuel diffusion effect (see summary).
  • the tip end face of the valve body that contacts the conical valve seat is formed in a spherical shape (see FIG. 2).
  • the tip surface of the valve body that contacts the conical valve seat is formed in a spherical shape, and the valve seat that penetrates the valve seat member is formed below the spherical valve body.
  • a hole is provided.
  • a large space including a valve seat hole is formed on the downstream side of the fuel seat portion where the valve body abuts the valve seat.
  • This space becomes a dead volume in which residual fuel accumulates after the fuel injection is completed.
  • this dead volume is large, the fuel injection amount varies greatly between when the fuel injection space is under atmospheric pressure and when it is under negative pressure.
  • the fuel flowing down from the seat portion flows from the entire circumference of the seat portion toward the center of the valve seat hole, merges so as to collide, and then radially outward from the outer edge of the valve seat hole. It flows so as to diffuse toward the flat fuel diffusion chamber.
  • the fuel flow flowing toward the center of the valve seat hole is decelerated so that the fuels flowing in from the entire circumference of the seat portion collide with each other, and the flow velocity cannot be sufficiently recovered before flowing into the fuel injection hole. There is sex.
  • An object of the present invention is to provide a fuel injection valve capable of reducing the dead volume formed on the downstream side of the fuel seat portion and improving the flow velocity of the fuel flowing into the fuel injection hole.
  • a fuel injection valve cooperates with a valve seat member having a valve seat and a fuel introduction hole formed on the downstream side of the valve seat and penetrating a lower end surface, and the valve seat.
  • a valve body that opens and closes the fuel passage, and a nozzle member that has a fuel injection hole formed radially outward from the inner peripheral surface of the fuel introduction hole and is fixed to the lower end surface of the valve seat member,
  • the nozzle member has a protruding portion that protrudes outward, and a fuel diffusion chamber is formed inside the protruding portion to flow the fuel flowing in from the fuel introduction hole outward in the radial direction.
  • the fuel injection valve has a protrusion at the tip of the valve body, and the protrusion protrudes toward the fuel diffusion chamber through the fuel introduction hole when the valve is closed.
  • the dead volume formed on the downstream side of the fuel seat portion is reduced and the fuel flowing into the fuel diffusion chamber is guided by the protruding portion provided at the distal end portion of the valve body.
  • the change in the fuel injection amount is small between the case where the fuel injection space is under atmospheric pressure and the case where the fuel injection space is under negative pressure, and the flow rate of the fuel flowing into the fuel injection hole is improved and the atomization performance is excellent.
  • a fuel injection valve can be provided.
  • FIG. 4 is an enlarged cross-sectional view showing the vicinity of a nozzle portion 8 shown in FIG. 1 (a cross-sectional view taken along the line II-II in FIG. 3). It is the III arrow directional view which looked at the nozzle plate 21n shown in FIG. 2 from the III arrow directional direction.
  • FIG. 4 is an enlarged cross-sectional view showing the vicinity of a nozzle portion 8 shown in FIG. 1 (a cross-sectional view taken along the line II-II in FIG. 3).
  • FIG. 1 is a longitudinal sectional view showing a longitudinal section along a central axis 1a of an embodiment of a fuel injection valve according to the present invention.
  • 2 is an enlarged cross-sectional view (cross-sectional view taken along the line II-II in FIG. 3) showing the vicinity of the nozzle portion 8 shown in FIG.
  • FIG. 3 is a III arrow view of the nozzle plate 21n shown in FIG. 2 as viewed from the III arrow direction.
  • the center axis 1a coincides with the axis (valve axis) of a mover 27 provided integrally with a valve body 17 which will be described later, and coincides with the center axis of a cylindrical body 5 which will be described later.
  • the fuel injection valve 1 is constituted by a cylindrical body 5 made of a metal material so that the fuel flow path 3 is substantially along the central axis 1a.
  • the cylindrical body 5 is formed in a stepped shape in the direction along the central axis 1a by press working such as deep drawing using a metal material such as magnetic stainless steel.
  • the diameter of the one end side 5a is large with respect to the diameter of the other end side 5b.
  • the large diameter portion 5 a formed on one end side is drawn to be above the small diameter portion 5 b formed on the other end side.
  • the upper end portion (upper end side) is referred to as a base end portion (base end side), and the lower end portion (lower end side) is referred to as a distal end portion (front end side).
  • proximal end portion (proximal end side)” and distal end portion (front end side)” are based on the fuel flow direction. Further, the vertical relationship described in this specification is based on FIG. 1 and is not related to the vertical direction when the fuel injection valve 1 is mounted on the internal combustion engine.
  • a fuel supply port 2 is provided at the base end of the cylindrical body 5, and a fuel filter 13 for removing foreign matters mixed in the fuel is attached to the fuel supply port 2.
  • the fuel filter 13 includes a cylindrical metal core 13a, a resin material frame 13b, and a mesh-shaped filter body 13c.
  • the resin material of the frame 13b is, for example, nylon, fluororesin or the like, and is molded integrally with the core metal 13a.
  • the filter main body 13c is attached to the frame 13b, and is fixed to the base end portion of the cylindrical body 5 by press-fitting the cored bar 13a inside the large diameter portion 5a of the cylindrical body 5.
  • the base end portion of the cylindrical body 5 is formed with a flange portion (expanded diameter portion) 5d that is bent so as to expand toward the radially outer side, and the flange portion 5d and the base end side end portion 47a of the cover 47 are formed.
  • An O-ring 11 is disposed in the formed annular recess (annular groove) 4.
  • a valve portion 7 including a valve body 17 and a valve seat member 15 is formed at the tip of the cylindrical body 5.
  • the valve seat member 15 is formed with a through hole 15a penetrating in a direction along the central axis 1a.
  • a conical surface whose diameter decreases toward the downstream side is formed in the middle of the through hole 15a, and the through hole 15a is formed in a stepped shape by the conical surface.
  • the valve seat 15b is formed on the conical surface, and the fuel passage is opened and closed by the valve body 17 coming into contact with the valve seat 15b.
  • the entire conical surface on which the valve seat 15b is formed may be referred to as a valve seat surface.
  • the inner peripheral surface on the upper side from the conical surface in the through-hole 15 a constitutes a valve body accommodation hole for housing the valve body 17.
  • a guide surface 15c for guiding the valve body 17 in the direction along the central axis 1a is formed on the inner peripheral surface of the through hole 15a constituting the valve body accommodation hole.
  • a diameter increasing portion 15d that increases in diameter toward the upstream side is formed.
  • the enlarged diameter portion 15d facilitates the assembly of the valve body 17 and serves to enlarge the fuel passage cross section.
  • the lower end portion of the valve body accommodating hole 15a opens to the tip surface (lower end surface or downstream end surface) 15t (see FIG. 2) of the valve seat member 15, and this opening constitutes a fuel introduction hole 15e.
  • the valve seat member 15 is inserted inside the front end side of the cylindrical body 5 and is fixed to the cylindrical body 5 by laser welding.
  • the laser welding 19 is performed from the outer peripheral side of the cylindrical body 5 over the entire periphery.
  • the valve seat member 15 may be fixed to the tubular body 5 by laser welding after the valve seat member 15 is press-fitted inside the distal end side of the tubular body 5.
  • a nozzle plate (nozzle member) 21n is attached to an end face (hereinafter referred to as a front end face) 15t on the front end side of the valve seat member 15.
  • the nozzle plate 21n is fixed to the valve seat member 15 by laser welding.
  • the laser welding part 23 surrounds the injection hole forming region where the fuel injection holes 110-1 to 110-10 (see FIG. 3) are formed, and makes a round around the injection hole forming region.
  • the nozzle plate 21n is configured by a plate-like member (flat plate) having a uniform plate thickness, and a protruding portion 21na is formed at the center portion so as to protrude outward in the direction of the central axis 1a.
  • the protruding portion 21na is formed of a curved surface (for example, a spherical surface).
  • a fuel chamber (fuel diffusion chamber) 21a is formed inside the projecting portion 21na.
  • the fuel chamber 21a communicates with a fuel introduction hole 15e formed in the valve seat member 15, and fuel is supplied to the fuel chamber 21a through the fuel introduction hole 15e. Radius r 21a of the fuel diffusion chamber 21a is greater than the radius r 15e of the fuel introduction hole 15e.
  • a plurality of fuel injection holes 110-1 to 110-10 are formed in the projecting portion 21na.
  • the fuel injection holes 110-1 to 110-10 have an inlet opening formed radially outside the radius r 15e , and an outlet opening formed further radially outside the inlet opening. Therefore, as shown in FIG. 2, the central axes 110-3a and 110-8a of the fuel injection holes 110-3 and 110-8 are inclined with respect to the central axis 1a of the fuel injection valve 1.
  • the central axes of the fuel injection holes 110-1, 110-2, 110-4 to 110-7, 110-9, 110-10 are also inclined with respect to the central axis 1a of the fuel injection valve 1. Yes. However, the inclination direction and the inclination angle of each central axis are different for each fuel injection hole in order to inject fuel in a direction to be described later.
  • the fuel injected from the fuel injection holes 110-1 to 110-5 is injected in the direction indicated by the arrow A, and the fuel injection holes 110-6 to 110-
  • the inclination angle of the central axis of each of the fuel injection holes 110-1 to 110-10 is set so that the fuel injected from 10 is injected in the direction indicated by arrow B.
  • the two-way spray in which a fuel is divided and injected in two directions is formed.
  • the form of the fuel spray is not limited to the two-way spray, and the spray may be formed in more than one direction, or may be formed in only one direction.
  • the fuel injection holes 110-1 to 110-10 will be described simply as “fuel injection holes 110”.
  • the nozzle plate 21n described above constitutes the fuel injection section 21 that determines the fuel spray form.
  • valve portion 7 that opens and closes the fuel injection hole 110 is constituted by a valve seat member 15 and a valve body 17, and the fuel injection portion 21 that determines the form of fuel spray is constituted by a nozzle plate 21n.
  • the valve part 7 and the fuel injection part 21 comprise the nozzle part 8 for performing fuel injection. That is, the nozzle portion 8 in the present embodiment is configured by joining the nozzle plate 21n to the tip surface 15t on the main body side (valve seat member 15) of the nozzle portion 8.
  • the valve body 17 is constituted by a needle valve, and a seat portion 17a that comes into contact with the valve seat 15b is formed.
  • the seat portion 17a and the valve seat 15b of the valve body 17 constitute a fuel seat portion that shuts off the fuel flow by abutting each other.
  • a plurality of projecting portions formed to protrude from the outer peripheral surface are provided on the outer peripheral surface of the shaft portion 17b of the valve body 17 at a portion facing the guide surface 15c at intervals in the circumferential direction. It slides on the guide surface 15c.
  • the guide structure of the valve body 17 has various forms, and is not limited to the form of the present embodiment.
  • the outer peripheral surface of the shaft portion 17b of the valve body 17 may be formed of a simple cylindrical surface or cylindrical surface, and a groove serving as a fuel passage may be formed on the guide surface 15c side that guides the cylindrical surface or cylindrical surface.
  • a driving unit 9 for driving the valve body 17 is disposed in the middle part of the cylindrical body 5.
  • the drive unit 9 is composed of an electromagnetic actuator (electromagnetic drive unit). Specifically, the drive unit 9 is disposed on the front end side with respect to the fixed iron core 25 inside the cylindrical body 5 and the fixed iron core 25 fixed inside (inner peripheral side) of the cylindrical body 5.
  • the electromagnetic coil 29 is extrapolated to the side, and a yoke 33 that covers the electromagnetic coil 29 on the outer peripheral side of the electromagnetic coil 29.
  • a movable element 27 and a movable iron core 27a are accommodated inside the cylindrical body 5, and the cylindrical body 5 constitutes a housing that faces the outer peripheral surface of the movable iron core 27a and surrounds the movable iron core 27a.
  • the movable iron core 27a, the fixed iron core 25, and the yoke 33 constitute a closed magnetic circuit through which a magnetic flux generated by energizing the electromagnetic coil 29 flows.
  • the magnetic flux passes through the minute gap ⁇ , in order to reduce the leakage magnetic flux flowing through the cylindrical body 5 at the portion of the minute gap ⁇ , the nonmagnetic portion or the cylindrical body is located at a position corresponding to the minute gap ⁇ of the cylindrical body 5.
  • 5 is provided with a weak magnetic portion 5c that is weaker than other portions.
  • the nonmagnetic portion or the weak magnetic portion 5c will be described simply as the nonmagnetic portion 5c.
  • the nonmagnetic portion 5 c can be formed by performing a demagnetization process on the cylindrical body 5 having magnetism with respect to the cylindrical body 5.
  • Such demagnetization treatment can be performed by, for example, heat treatment.
  • a hardening process for increasing the hardness of the nonmagnetic portion 5c is also performed by heat treatment or cold working.
  • the non-magnetic cylindrical body 5 c is preferably a material having higher hardness than the cylindrical body 5.
  • the portion corresponding to the non-magnetic portion 5c can be made thinner.
  • the electromagnetic coil 29 is wound around a bobbin 31 formed in a cylindrical shape with a resin material and is extrapolated to the outer peripheral side of the cylindrical body 5.
  • the electromagnetic coil 29 is electrically connected to a terminal 43 provided on the connector 41.
  • a coil device 70 is constituted by the electromagnetic coil 29, the bobbin 31, the terminal 43, and the like.
  • An external drive circuit (not shown) is connected to the connector 41, and a drive current is passed through the electromagnetic coil 29 via the terminal 43.
  • the fixed iron core 25 is made of a magnetic metal material.
  • the fixed iron core 25 is formed in a cylindrical shape, and has a through hole 25a that penetrates the central portion in a direction along the central axis 1a.
  • the fixed iron core 25 is press-fitted and fixed to the proximal end side of the small-diameter portion 5 b of the cylindrical body 5, and is positioned at the intermediate portion of the cylindrical body 5. Since the large diameter portion 5a is provided on the base end side of the small diameter portion 5b, the fixed iron core 25 can be easily assembled.
  • the fixed iron core 25 may be fixed to the cylindrical body 5 by welding, or may be fixed to the cylindrical body 5 by using welding and press fitting together.
  • the movable element 27 has a large-diameter portion 27 a formed on the proximal end side, and the large-diameter portion 27 a constitutes a movable iron core 27 a that faces the fixed iron core 25.
  • a small diameter portion 27b (shaft portion 17b) is formed on the distal end side with respect to the movable iron core 27a of the mover 27, and the valve body 17 is formed at the distal end of the small diameter portion 27b.
  • the small diameter portion 27b constitutes a connection portion 27b that connects the movable iron core 27a and the valve body 17.
  • the movable iron core 27a and the connecting portion 27b are integrally formed (one member made of the same material), but two members may be joined.
  • the mover 27 includes a movable iron core 27a, a small diameter portion 27b (shaft portion 17b), and a valve body 17.
  • the movable iron core 27a is a member that is connected to the valve body 17 and drives the valve body 17 in the opening / closing valve direction by the magnetic attraction acting between the fixed iron core 25 and the movable iron core 27a.
  • the mover 27 is guided to move in the direction along the central axis 1a (the on-off valve direction).
  • the hardness of the nonmagnetic portion 5c described above may be increased by a demagnetization process.
  • FIG. it is good to comprise the guide surface (support surface) which guides the outer peripheral part of the movable iron core 27a with this nonmagnetic part 5c.
  • a concave portion 27c that opens to an end surface facing the fixed iron core 25 is formed in the direction of the central axis 1a.
  • An annular surface 27e serving as a spring seat of a spring (coil spring) 39 is formed on the bottom surface of the recess 27c.
  • a through hole 27f is formed on the inner peripheral side of the annular surface 27e so as to penetrate the distal end side end of the small diameter portion (connecting portion) 27b along the central axis 1a.
  • the small diameter portion 27b has an opening 27d on the side surface.
  • a back pressure chamber 37 is formed between the outer peripheral surface of the small diameter portion 27 b and the inner peripheral surface of the cylindrical body 5.
  • the through hole 27f opens at the bottom surface of the recess 27c, and the opening 27d opens at the outer peripheral surface of the small diameter portion 27b, so that the base end side of the mover 27 and the side surface of the mover 27 are formed inside the mover 27
  • the fuel flow path 3 is formed to communicate with the back pressure chamber 37 formed in the above.
  • the fuel passage that communicates the concave portion 27c of the movable iron core 27a and the back pressure chamber 37 is not limited to the above-described configuration, and communicates directly from the concave portion 27c to the back pressure chamber 37 without passing through the through hole 27f of the small diameter portion 27b. It may be formed. In this case, the through hole 27f of the small diameter portion 27b is not necessary, and the small diameter portion 27b may be formed in a columnar shape.
  • a coil spring 39 is disposed in a compressed state across the through hole 25a of the fixed iron core 25 and the recess 27c of the movable iron core 27a.
  • the coil spring 39 functions as a biasing member that biases the movable element 27 in a direction (valve closing direction) in which the valve element 17 contacts the valve seat 15b.
  • An adjuster (adjuster) 35 is disposed inside the through hole 25 a of the fixed iron core 25, and the proximal end side end portion of the coil spring 39 is in contact with the distal end side end surface of the adjuster 35.
  • the adjuster 35 has a fuel flow path 3 that penetrates the central portion in a direction along the central axis 1a. After flowing through the fuel flow path 3 of the adjuster 35, the fuel flows into the fuel flow path 3 at the tip side portion of the through hole 25 a of the fixed iron core 25, and then flows into the fuel flow path 3 configured in the mover 27.
  • the yoke 33 is made of a magnetic metal material and also serves as a housing for the fuel injection valve 1.
  • the yoke 33 is formed in a stepped cylindrical shape having a large diameter portion 33a and a small diameter portion 33b.
  • the large diameter portion 33a has a cylindrical shape covering the outer periphery of the electromagnetic coil 29, and a small diameter portion 33b having a smaller diameter than the large diameter portion 33a is formed on the distal end side of the large diameter portion 33a.
  • the small diameter portion 33 b is press-fitted or inserted into the outer periphery of the small diameter portion 5 b of the cylindrical body 5. Thereby, the inner peripheral surface of the small diameter portion 33 b is in close contact with the outer peripheral surface of the cylindrical body 5. At this time, at least a part of the inner peripheral surface of the small-diameter portion 33b is opposed to the outer peripheral surface of the movable iron core 27a via the cylindrical body 5, and the magnetic resistance of the closed magnetic path at this facing portion is reduced.
  • An annular recess 33c is formed along the circumferential direction on the outer peripheral surface of the end portion on the front end side of the yoke 33.
  • the yoke 33 and the cylindrical body 5 are joined over the entire circumference by laser welding 24.
  • the yoke 33 has a distal end side end located on the distal end side with respect to the proximal end side end of the valve seat member 15. For this reason, the yoke 33 and the valve seat member 15 are provided in an overlapping range in the direction along the central axis 1a, and the tip of the cylindrical body 5 is reinforced.
  • the laser welding portion 19 of the valve seat member 15 is located further to the front end side than the end portion on the front end side of the yoke 33 so that the assembly order of the valve seat member 15 and the yoke 33 is not restricted. .
  • a cylindrical protector 49 having a flange portion 49 a is extrapolated to the distal end portion of the cylindrical body 5, and the distal end portion of the cylindrical body 5 is protected by the protector 49.
  • the protector 49 covers the top of the laser welding portion 24 of the yoke 33.
  • An annular groove 34 is formed by the flange portion 49a of the protector 49, the small diameter portion 33b of the yoke 33, and the step surface of the large diameter portion 33a and the small diameter portion 33b of the yoke 33, and an O-ring 46 is extrapolated to the annular groove 34.
  • the O-ring 46 is liquid-tight and air-tight between the inner peripheral surface of the insertion port formed on the internal combustion engine side and the outer peripheral surface of the small-diameter portion 33b of the yoke 33. Acts as a seal to ensure.
  • the resin cover 47 is molded and covered from the middle portion of the fuel injection valve 1 to the vicinity of the proximal end portion.
  • the end portion on the front end side of the resin cover 47 covers a part of the base end side of the large diameter portion 33 a of the yoke 33.
  • the resin cover 47 covers a wiring member that connects the electromagnetic coil 29 and the terminal 43, and the connector 41 is integrally formed by the resin cover 47.
  • the mover 27 When the electromagnetic coil 29 is in a non-energized state and no drive current flows through the electromagnetic coil 29, the mover 27 is urged in the valve closing direction by the coil spring 39, and the valve element 17 abuts (seats) the valve seat 15b. Is in a state.
  • a gap ⁇ exists between the distal end side end surface of the fixed iron core 25 and the proximal end side end surface of the movable iron core 27a.
  • the gap ⁇ is equal to the stroke of the mover 27 (that is, the valve body 17).
  • valve closed The time from when the movable element 27 moves in the valve opening direction and the valve body 17 starts to move away from the valve seat 15b to the time when the movable element 27 moves in the valve closing direction and the valve element 17 contacts the valve seat 15b again is opened.
  • valve closed the time when the valve element 17 is in contact with the valve seat 15b and is closed is called the valve closed time (valve closed state).
  • a protrusion may be provided on the end surface of the movable iron core 27a facing the fixed iron core 25.
  • the moving distance (stroke) of the valve body 17 is a size obtained by subtracting the protrusion height from the gap ⁇ .
  • mover 27 may be provided before the movable iron core 27a and the fixed iron core 25 contact.
  • FIG. 4 is an enlarged cross-sectional view (sectional view taken along the line II-II in FIG. 3) showing the vicinity of the nozzle portion 8 shown in FIG.
  • FIG. 2 shows the valve closed state
  • FIG. 4 shows the valve opened state.
  • a space (fuel reservoir) 3a surrounded by the valve body 17 and the valve seat member 15 on the downstream side from the seat portion 17a and the valve seat 15b of the valve body 17 and a space (fuel) inside the fuel introduction hole 15e.
  • the reservoir 3b and the space (fuel reservoir) 3c of the fuel chamber 21a form a dead volume in which fuel remains after fuel injection.
  • a protruding portion 17c is provided at the tip of the valve body 17.
  • the front end portion (front end surface) of the projecting portion 17c is located below the lower end surface 15t of the valve seat member 15 when the valve is closed, and penetrates the fuel introduction hole 15e and protrudes into the fuel chamber 21a.
  • the nozzle plate 21n is formed with a protruding portion 21na that protrudes outward, and a fuel chamber 21a is formed inside the protruding portion 21na.
  • a protruding amount (dimension) of the tip of the protruding portion 17c into the fuel chamber 21a is d1.
  • the height dimension h1 of the fuel chamber 21a is larger than the protruding dimension d1.
  • the tip of the projecting portion 17c has a columnar shape or a disc shape, and the tip surface has a circular shape.
  • An annular fuel passage 200 is formed between the outer peripheral surface 17g of the protruding portion 17c and the inner peripheral surface of the fuel introduction hole 15e.
  • the total cross-sectional area S2 of the annular fuel passage 200 is configured to be larger than the total cross-sectional area S1 of the fuel passage formed between the seat portion 17a of the valve body 17 and the valve seat 15b when the valve is opened. .
  • the front end surface of the projecting portion 17c and the lower end surface 15t of the valve seat member 15 are positioned at the same height.
  • the tip end surface of the projecting portion 17c and the lower end surface 15t of the valve seat member 15 do not need to be at the same height position when the valve is opened, but are desirably positioned at least downward from the same height position. This is because the outer peripheral surface of the protruding portion 17c functions as a flow path surface that guides fuel to the fuel chamber 21a.
  • a curved surface portion 17d formed on the downstream end portion of the shaft portion 17b, a tapered portion 17e formed on the downstream side of the curved surface portion 17d, and a downstream end portion of the tapered portion 17e.
  • the curved surface portion 17f is formed, and the cylindrical surface portion 17g is formed on the downstream side of the curved surface portion 17f.
  • the curved surface portion 17d is formed of a curved surface that protrudes toward the fuel passage, and connects the outer peripheral surface of the shaft portion 17b and the tapered surface 17e.
  • the curved surface of the curved surface portion 17d has an arc shape on the cross section of FIG.
  • the curved surface portion 17f is formed of a curved surface that is concave from the fuel passage side toward the inside of the valve body, and connects the tapered surface 17e and the cylindrical surface portion 17g of the projecting portion 17c.
  • the curved surface of the curved surface portion 17f has an arc shape on the cross section of FIG.
  • the fuel 201 flows into the throttle channel toward the fuel seat portion, and the flow velocity is increased.
  • the fuel that has passed through the curved surface portion 17d flows down the fuel passage formed between the seat portion 17a and the valve seat 15b, and reaches the fuel introduction hole 15e.
  • a curved surface portion 17f is formed on the upstream side of the fuel introduction hole 15e, and the direction in which the fuel flows on the upstream side of the fuel introduction hole 15e is guided in a direction 202 along the central axis 1a.
  • the pressure loss generated in the fuel flow at this portion can be suppressed. Therefore, the fuel flow can suppress a decrease in the flow rate and can maintain a large flow rate.
  • the cylindrical surface portion 17g of the projecting portion 17c guides the fuel whose direction of flow is changed along the central axis 1a to the fuel chamber 21a. Since the curved surface portion 17f and the cylindrical surface portion 17g change the direction of the fuel flow and guide the fuel to the fuel chamber 21a, the fuel can flow into the fuel chamber 21a while maintaining a large flow velocity.
  • the curved surface portion 17f and the cylindrical surface portion 17g function as a guide surface that guides the flow of fuel.
  • the curved surface portion 17f may be formed of a tapered surface, but the direction of the fuel flow can be changed smoothly if the curved surface, preferably the arc surface on the cross section shown in FIG.
  • the fuel that has flowed into the fuel chamber 21a flows outward through the fuel chamber 21a at a large flow velocity and flows into the fuel injection hole 110. Thereby, the fuel injected from the fuel injection hole 110 can maintain a large flow velocity, and the atomization performance of the spray is improved.
  • the projecting portion 17c contributes to a reduction in the volume of the dead volumes 3a, 3b, 3c.
  • the tip of the protruding portion 17c protrudes into the fuel chamber 21a even when the valve is opened.
  • the protrusion dimension d1 of the protrusion 17c is preferably larger than the stroke ⁇ of the mover 27.
  • the change in the fuel injection amount is increased depending on whether the space in which the fuel is injected is at atmospheric pressure or negative pressure.
  • the volumes of the three spaces (fuel reservoirs) 3a, 3b, 3c described above can be reduced by the projecting portion 17c, and even if the pressure of the space into which the fuel is injected changes. The change in the fuel injection amount can be suppressed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A fuel injection valve of the present invention is provided with: a valve seat member 15 that has a valve seat 15b and a fuel introduction hole 15e that is formed on the downstream side of the valve seat 15b and penetrates through a lower end surface 15t; a valve body 17 for opening and closing a fuel channel in collaboration with the valve seat 15b; and a nozzle member 21n in which fuel injection holes 110-3, 110-8 are formed radially outward from an inner circumferential surface of the fuel introduction hole 15e and which is fixed to the lower end surface 15t. The nozzle member 21n has a protruding section 21na, and a fuel diffusion chamber 21a that allows fuel to flow radially outward is formed on the inside of the protruding section 21na. A protruding section 17c is formed at a distal end of the valve body 17, and when the valve is closed, the protruding section 17c penetrates through the fuel introduction hole 15e and protrudes out to the fuel diffusion chamber 21a side. Due to this configuration, a dead volume formed on the downstream side of a fuel sheet section can be reduced, and the flow speed of the fuel flowing into the fuel injection holes can be improved.

Description

燃料噴射弁Fuel injection valve
　本発明は、燃料を噴射する燃料噴射弁に関する。 The present invention relates to a fuel injection valve that injects fuel.
　本技術分野の背景技術として、特開２００４－２８５９２３号公報（特許文献１）に記載された燃料噴射弁が知られている。特許文献１に記載された燃料噴射弁は、弁座部材と弁座部材の先端面に固定されたインジェクタプレートとの間に弁座孔の外端縁より半径方向外方に広がる偏平な燃料拡散室を設けた燃料噴射弁において、燃料拡散室の天井面に、天井面の高さを半径方向外方に向かって順次低下させる環状段部を形成し、この環状段部の直下に、かつ燃料拡散室の内周壁から離して燃料噴孔を配置し、燃料拡散室で放射状に広がる燃料を環状段部に衝突させて燃料の拡散効果を高めるようにしている（要約参照）。 As a background art in this technical field, a fuel injection valve described in Japanese Patent Application Laid-Open No. 2004-285923 (Patent Document 1) is known. The fuel injection valve described in Patent Document 1 is a flat fuel diffusion that spreads radially outward from the outer edge of the valve seat hole between the valve seat member and the injector plate fixed to the tip surface of the valve seat member. In the fuel injection valve provided with the chamber, an annular step portion is formed on the ceiling surface of the fuel diffusion chamber to sequentially reduce the height of the ceiling surface in the radially outward direction. Fuel injection holes are arranged away from the inner peripheral wall of the diffusion chamber, and fuel that spreads radially in the fuel diffusion chamber collides with the annular step portion to enhance the fuel diffusion effect (see summary).
　この燃料噴射弁では、円錐状の弁座と当接する弁体の先端面が球状に形成されている（図２参照）。 In this fuel injection valve, the tip end face of the valve body that contacts the conical valve seat is formed in a spherical shape (see FIG. 2).
特開２００４－２８５９２３号公報JP 2004-285923 A
　特許文献１に記載された燃料噴射弁では、円錐状の弁座と当接する弁体の先端面が球状に形成されており、球状を成す弁体の下方には弁座部材を貫通する弁座孔が設けられている。このため、弁体が弁座に当接する燃料シート部の下流側に、弁座孔を含む大きな空間が形成されている。この空間は、燃料噴射を終了した後、残留燃料が溜まるデッドボリュームとなる。このデッドボリュームが大きい場合、燃料噴射空間が大気圧下にある場合と負圧下にある場合とでは、燃料噴射量が大きく変化する。 In the fuel injection valve described in Patent Document 1, the tip surface of the valve body that contacts the conical valve seat is formed in a spherical shape, and the valve seat that penetrates the valve seat member is formed below the spherical valve body. A hole is provided. For this reason, a large space including a valve seat hole is formed on the downstream side of the fuel seat portion where the valve body abuts the valve seat. This space becomes a dead volume in which residual fuel accumulates after the fuel injection is completed. When this dead volume is large, the fuel injection amount varies greatly between when the fuel injection space is under atmospheric pressure and when it is under negative pressure.
　また、シート部から下流側に流下する燃料は、シート部の全周から弁座孔の中心に向かって流れ込み、衝突するように合流した後、弁座孔の外端縁より半径方向外方に広がる偏平な燃料拡散室に向かって拡散するように流れる。この場合、弁座孔の中心に向かって流れる燃料流れは、シート部全周から流れ込む燃料同士が衝突するように合流するため減速され、燃料噴射孔に流入するまでに流速を十分に回復できない可能性がある。 Further, the fuel flowing down from the seat portion flows from the entire circumference of the seat portion toward the center of the valve seat hole, merges so as to collide, and then radially outward from the outer edge of the valve seat hole. It flows so as to diffuse toward the flat fuel diffusion chamber. In this case, the fuel flow flowing toward the center of the valve seat hole is decelerated so that the fuels flowing in from the entire circumference of the seat portion collide with each other, and the flow velocity cannot be sufficiently recovered before flowing into the fuel injection hole. There is sex.
　燃料噴射孔に流入する燃料の流速が小さいと、燃料噴射孔から噴射される燃料噴霧の微粒化性能が低下することになる。 When the flow rate of the fuel flowing into the fuel injection hole is small, the atomization performance of the fuel spray injected from the fuel injection hole is lowered.
　本発明の目的は、燃料シート部の下流側に形成されるデッドボリュームを小さくすると共に、燃料噴射孔に流入する燃料の流速を向上することができる燃料噴射弁を提供することにある。 An object of the present invention is to provide a fuel injection valve capable of reducing the dead volume formed on the downstream side of the fuel seat portion and improving the flow velocity of the fuel flowing into the fuel injection hole.
　上記目的を達成するために、本発明の燃料噴射弁は、弁座と前記弁座の下流側に形成され下端面を貫通する燃料導入孔とを有する弁座部材と、前記弁座と協働して燃料通路を開閉する弁体と、燃料導入孔の内周面よりも径方向外方に燃料噴射孔が形成され前記弁座部材の前記下端面に固定されたノズル部材とを備え、前記ノズル部材は外方に向かって突状を成す突状部を有し、前記突状部の内側に前記燃料導入孔から流入した燃料を径方向外方に向かって流す燃料拡散室が形成された燃料噴射弁において、前記弁体の先端部に突状部を有し、前記突状部は閉弁時に前記燃料導入孔を貫通して前記燃料拡散室側に突出している。 In order to achieve the above object, a fuel injection valve according to the present invention cooperates with a valve seat member having a valve seat and a fuel introduction hole formed on the downstream side of the valve seat and penetrating a lower end surface, and the valve seat. A valve body that opens and closes the fuel passage, and a nozzle member that has a fuel injection hole formed radially outward from the inner peripheral surface of the fuel introduction hole and is fixed to the lower end surface of the valve seat member, The nozzle member has a protruding portion that protrudes outward, and a fuel diffusion chamber is formed inside the protruding portion to flow the fuel flowing in from the fuel introduction hole outward in the radial direction. The fuel injection valve has a protrusion at the tip of the valve body, and the protrusion protrudes toward the fuel diffusion chamber through the fuel introduction hole when the valve is closed.
　本発明によれば、弁体の先端部に設けられた突状部により、燃料シート部の下流側に形成されるデッドボリュームを小さくすると共に、燃料拡散室に流入する燃料を誘導する。
　これにより、燃料噴射空間が大気圧下にある場合と負圧下にある場合とで、燃料噴射量の変化が小さく、また燃料噴射孔に流入する燃料の流速を向上して微粒化性能に優れた燃料噴射弁を提供することができる。 According to the present invention, the dead volume formed on the downstream side of the fuel seat portion is reduced and the fuel flowing into the fuel diffusion chamber is guided by the protruding portion provided at the distal end portion of the valve body.
As a result, the change in the fuel injection amount is small between the case where the fuel injection space is under atmospheric pressure and the case where the fuel injection space is under negative pressure, and the flow rate of the fuel flowing into the fuel injection hole is improved and the atomization performance is excellent. A fuel injection valve can be provided.
本発明に係る燃料噴射弁の一実施例について、中心軸線１ａに沿う縦断面を示す縦断面図である。It is a longitudinal cross-sectional view which shows the longitudinal cross-section in alignment with the central axis 1a about one Example of the fuel injection valve which concerns on this invention. 図１に示すノズル部８の近傍を拡大して示す断面図（図３のＩＩ－ＩＩ矢視断面図）である。FIG. 4 is an enlarged cross-sectional view showing the vicinity of a nozzle portion 8 shown in FIG. 1 (a cross-sectional view taken along the line II-II in FIG. 3). 図２に示すノズルプレート２１ｎをＩＩＩ矢視方向から見たＩＩＩ矢視図である。It is the III arrow directional view which looked at the nozzle plate 21n shown in FIG. 2 from the III arrow directional direction. 図１に示すノズル部８の近傍を拡大して示す断面図（図３のＩＩ－ＩＩ矢視断面図）である。FIG. 4 is an enlarged cross-sectional view showing the vicinity of a nozzle portion 8 shown in FIG. 1 (a cross-sectional view taken along the line II-II in FIG. 3).
　本発明に係る燃料噴射弁の一実施例について、図１～図４を用いて説明する。 An embodiment of a fuel injection valve according to the present invention will be described with reference to FIGS.
　まず、図１乃至図３を参照して、燃料噴射弁１の全体構成について説明する。図１は、本発明に係る燃料噴射弁の一実施例について、中心軸線１ａに沿う縦断面を示す縦断面図である。図２は、図１に示すノズル部８の近傍を拡大して示す断面図（図３のＩＩ－ＩＩ矢視断面図）である。図３は、図２に示すノズルプレート２１ｎをＩＩＩ矢視方向から見たＩＩＩ矢視図である。なお、中心軸線１ａは、後述する弁体１７が一体に設けられた可動子２７の軸心（弁軸心）に一致し、後述する筒状体５の中心軸線に一致している。 First, the overall configuration of the fuel injection valve 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal sectional view showing a longitudinal section along a central axis 1a of an embodiment of a fuel injection valve according to the present invention. 2 is an enlarged cross-sectional view (cross-sectional view taken along the line II-II in FIG. 3) showing the vicinity of the nozzle portion 8 shown in FIG. FIG. 3 is a III arrow view of the nozzle plate 21n shown in FIG. 2 as viewed from the III arrow direction. The center axis 1a coincides with the axis (valve axis) of a mover 27 provided integrally with a valve body 17 which will be described later, and coincides with the center axis of a cylindrical body 5 which will be described later.
　燃料噴射弁１には、金属材製の筒状体５によって、その内側に燃料流路３がほぼ中心軸線１ａに沿うように構成されている。筒状体５は、磁性を有するステンレス等の金属素材を用い、深絞り加工等のプレス加工により中心軸線１ａに沿う方向に段付きの形状に形成されている。これにより、筒状体５は、一端側５ａの径が他端側５ｂの径に対して大きくなっている。図１においては、一端側に形成された大径部５ａが、他端側に形成された小径部５ｂの上側になるように描いてある。 The fuel injection valve 1 is constituted by a cylindrical body 5 made of a metal material so that the fuel flow path 3 is substantially along the central axis 1a. The cylindrical body 5 is formed in a stepped shape in the direction along the central axis 1a by press working such as deep drawing using a metal material such as magnetic stainless steel. Thereby, as for the cylindrical body 5, the diameter of the one end side 5a is large with respect to the diameter of the other end side 5b. In FIG. 1, the large diameter portion 5 a formed on one end side is drawn to be above the small diameter portion 5 b formed on the other end side.
　図１において、上端部（上端側）を基端部（基端側）と呼び、下端部（下端側）を先端部（先端側）と呼ぶことにする。基端部（基端側）及び先端部（先端側）という呼び方は、燃料の流れ方向に基づいている。また、本明細書において説明される上下関係は図１を基準とするもので、燃料噴射弁１の内燃機関への搭載時における上下方向とは関係がない。 In FIG. 1, the upper end portion (upper end side) is referred to as a base end portion (base end side), and the lower end portion (lower end side) is referred to as a distal end portion (front end side). The term “proximal end portion (proximal end side)” and “distal end portion (front end side)” are based on the fuel flow direction. Further, the vertical relationship described in this specification is based on FIG. 1 and is not related to the vertical direction when the fuel injection valve 1 is mounted on the internal combustion engine.
　筒状体５の基端部には燃料供給口２が設けられ、この燃料供給口２に、燃料に混入した異物を取り除くための燃料フィルタ１３が取り付けられている。燃料フィルタ１３は、筒状の芯金１３ａと、樹脂材料製のフレーム１３ｂと、メッシュ状のフィルタ本体１３ｃとで構成されている。フレーム１３ｂの樹脂材料は、例えば、ナイロン、フッ素樹脂等であり、芯金１３ａと一体に成形されている。フィルタ本体１３ｃはフレーム１３ｂに取り付けられ、芯金１３ａが筒状体５の大径部５ａの内側に圧入されることにより、筒状体５の基端部に固定されている。 A fuel supply port 2 is provided at the base end of the cylindrical body 5, and a fuel filter 13 for removing foreign matters mixed in the fuel is attached to the fuel supply port 2. The fuel filter 13 includes a cylindrical metal core 13a, a resin material frame 13b, and a mesh-shaped filter body 13c. The resin material of the frame 13b is, for example, nylon, fluororesin or the like, and is molded integrally with the core metal 13a. The filter main body 13c is attached to the frame 13b, and is fixed to the base end portion of the cylindrical body 5 by press-fitting the cored bar 13a inside the large diameter portion 5a of the cylindrical body 5.
　筒状体５の基端部は径方向外側に向けて拡径するように曲げられた鍔部（拡径部）５ｄが形成され、鍔部５ｄとカバー４７の基端側端部４７ａとで形成される環状凹部（環状溝部）４にＯリング１１が配設されている。 The base end portion of the cylindrical body 5 is formed with a flange portion (expanded diameter portion) 5d that is bent so as to expand toward the radially outer side, and the flange portion 5d and the base end side end portion 47a of the cover 47 are formed. An O-ring 11 is disposed in the formed annular recess (annular groove) 4.
　筒状体５の先端部には、弁体１７と弁座部材１５とからなる弁部７が構成されている。弁座部材１５には、中心軸線１ａに沿う方向に貫通する貫通孔１５ａが形成されている。貫通孔１５ａの途中には下流側に向かって縮径する円錐面が形成され、貫通孔１５ａはこの円錐面によって段付き状に形成されている。そして円錐面上には弁座１５ｂが構成され、弁体１７が弁座１５ｂに離接することにより、燃料通路の開閉が行われる。なお、弁座１５ｂが形成された円錐面全体を弁座面と呼ぶ場合もある。 A valve portion 7 including a valve body 17 and a valve seat member 15 is formed at the tip of the cylindrical body 5. The valve seat member 15 is formed with a through hole 15a penetrating in a direction along the central axis 1a. A conical surface whose diameter decreases toward the downstream side is formed in the middle of the through hole 15a, and the through hole 15a is formed in a stepped shape by the conical surface. The valve seat 15b is formed on the conical surface, and the fuel passage is opened and closed by the valve body 17 coming into contact with the valve seat 15b. The entire conical surface on which the valve seat 15b is formed may be referred to as a valve seat surface.
　貫通孔１５ａにおける、円錐面から上側の内周面は、弁体１７を収容する弁体収容孔を構成する。弁体収容孔を構成する貫通孔１５ａの内周面に、弁体１７を中心軸線１ａに沿う方向に案内するガイド面１５ｃが形成されている。ガイド面１５ｃの上流側には、上流側に向かって拡径する拡径部１５ｄが形成されている。拡径部１５ｄは弁体１７の組付けを容易にすると共に、燃料通路断面を拡大するのに役立っている。一方、弁体収容孔１５ａの下端部は弁座部材１５の先端面（下端面又は下流側端面）１５ｔ（図２参照）に開口し、この開口は燃料導入孔１５ｅを構成する。 The inner peripheral surface on the upper side from the conical surface in the through-hole 15 a constitutes a valve body accommodation hole for housing the valve body 17. A guide surface 15c for guiding the valve body 17 in the direction along the central axis 1a is formed on the inner peripheral surface of the through hole 15a constituting the valve body accommodation hole. On the upstream side of the guide surface 15c, a diameter increasing portion 15d that increases in diameter toward the upstream side is formed. The enlarged diameter portion 15d facilitates the assembly of the valve body 17 and serves to enlarge the fuel passage cross section. On the other hand, the lower end portion of the valve body accommodating hole 15a opens to the tip surface (lower end surface or downstream end surface) 15t (see FIG. 2) of the valve seat member 15, and this opening constitutes a fuel introduction hole 15e.
　弁座部材１５は、筒状体５の先端側内側に挿入され、レーザ溶接により筒状体５に固定されている。レーザ溶接１９は、筒状体５の外周側から全周に亘って実施されている。この場合、弁座部材１５を筒状体５の先端側内側に圧入した上で、弁座部材１５をレーザ溶接により筒状体５に固定してもよい。 The valve seat member 15 is inserted inside the front end side of the cylindrical body 5 and is fixed to the cylindrical body 5 by laser welding. The laser welding 19 is performed from the outer peripheral side of the cylindrical body 5 over the entire periphery. In this case, the valve seat member 15 may be fixed to the tubular body 5 by laser welding after the valve seat member 15 is press-fitted inside the distal end side of the tubular body 5.
　図２に示すように、弁座部材１５の先端側の端面（以下、先端面と言う）１５ｔには、ノズルプレート（ノズル部材）２１ｎが取り付けられている。ノズルプレート２１ｎは弁座部材１５に対してレーザ溶接により固定されている。レーザ溶接部２３は、燃料噴射孔１１０－１～１１０－１０（図３参照）が形成された噴射孔形成領域を取り囲むようにして、この噴射孔形成領域の周囲を一周している。 As shown in FIG. 2, a nozzle plate (nozzle member) 21n is attached to an end face (hereinafter referred to as a front end face) 15t on the front end side of the valve seat member 15. The nozzle plate 21n is fixed to the valve seat member 15 by laser welding. The laser welding part 23 surrounds the injection hole forming region where the fuel injection holes 110-1 to 110-10 (see FIG. 3) are formed, and makes a round around the injection hole forming region.
　また、ノズルプレート２１ｎは板厚が均一な板状部材（平板）で構成されており、中央部には中心軸線１ａ方向の外方に向けて突き出すように突状部２１ｎａが形成されている。突状部２１ｎａは曲面（例えば球状面）で形成されている。突状部２１ｎａの内側には燃料室（燃料拡散室）２１ａが形成されている。この燃料室２１ａは弁座部材１５に形成された燃料導入孔１５ｅに連通しており、燃料導入孔１５ｅを通じて燃料室２１ａに燃料が供給される。燃料拡散室２１ａの半径ｒ21aは燃料導入孔１５ｅの半径ｒ15eよりも大きい。 The nozzle plate 21n is configured by a plate-like member (flat plate) having a uniform plate thickness, and a protruding portion 21na is formed at the center portion so as to protrude outward in the direction of the central axis 1a. The protruding portion 21na is formed of a curved surface (for example, a spherical surface). A fuel chamber (fuel diffusion chamber) 21a is formed inside the projecting portion 21na. The fuel chamber 21a communicates with a fuel introduction hole 15e formed in the valve seat member 15, and fuel is supplied to the fuel chamber 21a through the fuel introduction hole 15e. Radius r 21a of the fuel diffusion chamber 21a is greater than the radius r 15e of the fuel introduction hole 15e.
　突状部２１ｎａには複数の燃料噴射孔１１０－１～１１０－１０が形成されている。燃料噴射孔１１０－１～１１０－１０は、その入口開口が半径ｒ15eよりも径方向外側に形成されており、出口開口は入口開口よりもさらに径方向外側に形成されている。このため、図２に示すように、燃料噴射孔１１０－３，１１０－８の中心軸線１１０－３ａ，１１０－８ａは燃料噴射弁１の中心軸線１ａに対して傾斜している。燃料噴射孔１１０－１，１１０－２，１１０－４～１１０－７，１１０－９，１１０－１０（図３参照）の中心軸線も、燃料噴射弁１の中心軸線１ａに対して傾斜している。ただし、各中心軸線の傾斜方向及び傾斜角は、燃料を後述する方向に噴射するため、燃料噴射孔毎に異なる。 A plurality of fuel injection holes 110-1 to 110-10 are formed in the projecting portion 21na. The fuel injection holes 110-1 to 110-10 have an inlet opening formed radially outside the radius r 15e , and an outlet opening formed further radially outside the inlet opening. Therefore, as shown in FIG. 2, the central axes 110-3a and 110-8a of the fuel injection holes 110-3 and 110-8 are inclined with respect to the central axis 1a of the fuel injection valve 1. The central axes of the fuel injection holes 110-1, 110-2, 110-4 to 110-7, 110-9, 110-10 (see FIG. 3) are also inclined with respect to the central axis 1a of the fuel injection valve 1. Yes. However, the inclination direction and the inclination angle of each central axis are different for each fuel injection hole in order to inject fuel in a direction to be described later.
　本実施例では、図３の平面上において、燃料噴射孔１１０－１～１１０－５から噴射される燃料は矢印Ａで示す方向に噴射されるように、また燃料噴射孔１１０－６～１１０－１０から噴射される燃料は矢印Ｂで示す方向に噴射されるように、各燃料噴射孔１１０－１～１１０－１０の中心軸線の傾き角が設定されている。これにより、本実施例では、燃料が二方向に分かれて噴射される二方向噴霧を形成する。燃料噴霧の形態については、二方向噴霧に限定されるものではなく、さらに多方向に噴霧を形成してもよく、或いは一方向のみに噴霧を形成するものであってもよい。なお、以下、燃料噴射孔１１０－１～１１０－１０を区別する必要のない場合は、単に「燃料噴射孔１１０」として説明する。 In the present embodiment, on the plane of FIG. 3, the fuel injected from the fuel injection holes 110-1 to 110-5 is injected in the direction indicated by the arrow A, and the fuel injection holes 110-6 to 110- The inclination angle of the central axis of each of the fuel injection holes 110-1 to 110-10 is set so that the fuel injected from 10 is injected in the direction indicated by arrow B. Thereby, in a present Example, the two-way spray in which a fuel is divided and injected in two directions is formed. The form of the fuel spray is not limited to the two-way spray, and the spray may be formed in more than one direction, or may be formed in only one direction. Hereinafter, when it is not necessary to distinguish between the fuel injection holes 110-1 to 110-10, the fuel injection holes 110-1 to 110-10 will be described simply as “fuel injection holes 110”.
　上述したノズルプレート２１ｎによって、燃料噴霧の形態を決定する燃料噴射部２１が構成される。 The nozzle plate 21n described above constitutes the fuel injection section 21 that determines the fuel spray form.
　本実施例において、燃料噴射孔１１０を開閉する弁部７は弁座部材１５と弁体１７とによって構成され、燃料噴霧の形態を決定する燃料噴射部２１はノズルプレート２１ｎによって構成される。そして、弁部７と燃料噴射部２１とは、燃料噴射を行うためのノズル部８を構成している。すなわち、本実施例におけるノズル部８は、ノズルプレート２１ｎがノズル部８の本体側（弁座部材１５）の先端面１５ｔに接合されて構成されている。 In this embodiment, the valve portion 7 that opens and closes the fuel injection hole 110 is constituted by a valve seat member 15 and a valve body 17, and the fuel injection portion 21 that determines the form of fuel spray is constituted by a nozzle plate 21n. And the valve part 7 and the fuel injection part 21 comprise the nozzle part 8 for performing fuel injection. That is, the nozzle portion 8 in the present embodiment is configured by joining the nozzle plate 21n to the tip surface 15t on the main body side (valve seat member 15) of the nozzle portion 8.
　また、本実施例では、弁体１７はニードル弁で構成しており、弁座１５ｂと当接するシート部１７ａが形成されている。弁体１７のシート部１７ａと弁座１５ｂとは相互に当接することにより燃料の流れを遮断する燃料シート部を構成する。また、弁体１７の軸部１７ｂの外周面には、ガイド面１５ｃと対向する部位に、外周面から突き出すように形成された突状部が周方向に間隔をあけて複数設けられており、ガイド面１５ｃと摺動する。 Further, in this embodiment, the valve body 17 is constituted by a needle valve, and a seat portion 17a that comes into contact with the valve seat 15b is formed. The seat portion 17a and the valve seat 15b of the valve body 17 constitute a fuel seat portion that shuts off the fuel flow by abutting each other. In addition, a plurality of projecting portions formed to protrude from the outer peripheral surface are provided on the outer peripheral surface of the shaft portion 17b of the valve body 17 at a portion facing the guide surface 15c at intervals in the circumferential direction. It slides on the guide surface 15c.
　弁体１７のガイド構造には種々の形態があり、本実施例の形態に限定される訳ではない。例えば、弁体１７の軸部１７ｂの外周面を単純な円柱面或いは円筒面で構成し、この円柱面或いは円筒面をガイドするガイド面１５ｃ側に燃料通路となる溝を形成してもよい。 The guide structure of the valve body 17 has various forms, and is not limited to the form of the present embodiment. For example, the outer peripheral surface of the shaft portion 17b of the valve body 17 may be formed of a simple cylindrical surface or cylindrical surface, and a groove serving as a fuel passage may be formed on the guide surface 15c side that guides the cylindrical surface or cylindrical surface.
　筒状体５の中間部には弁体１７を駆動するための駆動部９が配置されている。駆動部９は電磁アクチュエータ（電磁駆動部）で構成されている。具体的には、駆動部９は、筒状体５の内部（内周側）に固定された固定鉄心２５と、筒状体５の内部において固定鉄心２５に対して先端側に配置され、中心軸線１ａに沿う方向に移動可能な可動子（可動部材）２７と、固定鉄心２５と可動子２７に構成された可動鉄心２７ａとが微小ギャップδを介して対向する位置で筒状体５の外周側に外挿された電磁コイル２９と、電磁コイル２９の外周側で電磁コイル２９を覆うヨーク３３とによって構成されている。 A driving unit 9 for driving the valve body 17 is disposed in the middle part of the cylindrical body 5. The drive unit 9 is composed of an electromagnetic actuator (electromagnetic drive unit). Specifically, the drive unit 9 is disposed on the front end side with respect to the fixed iron core 25 inside the cylindrical body 5 and the fixed iron core 25 fixed inside (inner peripheral side) of the cylindrical body 5. The outer periphery of the cylindrical body 5 at a position where the movable element (movable member) 27 movable in the direction along the axis 1a, and the fixed iron core 25 and the movable iron core 27a formed on the movable element 27 face each other with a minute gap δ. The electromagnetic coil 29 is extrapolated to the side, and a yoke 33 that covers the electromagnetic coil 29 on the outer peripheral side of the electromagnetic coil 29.
　筒状体５の内側には可動子２７及び可動鉄心２７ａが収容されており、筒状体５は可動鉄心２７ａの外周面と対向して可動鉄心２７ａを囲繞するハウジングを構成している。 A movable element 27 and a movable iron core 27a are accommodated inside the cylindrical body 5, and the cylindrical body 5 constitutes a housing that faces the outer peripheral surface of the movable iron core 27a and surrounds the movable iron core 27a.
　可動鉄心２７ａと固定鉄心２５とヨーク３３とは、電磁コイル２９に通電することにより生じる磁束が流れる閉磁路を構成する。磁束は微小ギャップδを通過するが、微小ギャップδの部分で筒状体５を流れる漏れ磁束を低減するため、筒状体５の微小ギャップδに対応する位置に、非磁性部或いは筒状体５の他の部分よりも弱磁性の弱磁性部５ｃが設けられている。以下、この非磁性部或いは弱磁性部５ｃは、単に非磁性部５ｃと呼んで説明する。非磁性部５ｃは、筒状体５に対する磁性を有する筒状体５に非磁性化処理を行うことにより形成することができる。このような非磁性化処理は、例えば熱処理によって行うことができる。また、熱処理又は冷間加工等によって非磁性部５ｃの硬度を高める高硬度化処理も実施する。或いは、磁性を有する筒状体５に非磁性の筒状体５ｃを接続してもよい。この場合、非磁性の筒状体５ｃは筒状体５よりも高硬度の材料であることが好ましい。或いは、筒状体５の外周面に環状凹部を形成することにより非磁性部５ｃに相当する部分を薄肉化して構成することができる。 The movable iron core 27a, the fixed iron core 25, and the yoke 33 constitute a closed magnetic circuit through which a magnetic flux generated by energizing the electromagnetic coil 29 flows. Although the magnetic flux passes through the minute gap δ, in order to reduce the leakage magnetic flux flowing through the cylindrical body 5 at the portion of the minute gap δ, the nonmagnetic portion or the cylindrical body is located at a position corresponding to the minute gap δ of the cylindrical body 5. 5 is provided with a weak magnetic portion 5c that is weaker than other portions. Hereinafter, the nonmagnetic portion or the weak magnetic portion 5c will be described simply as the nonmagnetic portion 5c. The nonmagnetic portion 5 c can be formed by performing a demagnetization process on the cylindrical body 5 having magnetism with respect to the cylindrical body 5. Such demagnetization treatment can be performed by, for example, heat treatment. Further, a hardening process for increasing the hardness of the nonmagnetic portion 5c is also performed by heat treatment or cold working. Or you may connect the nonmagnetic cylindrical body 5c to the cylindrical body 5 which has magnetism. In this case, the non-magnetic cylindrical body 5 c is preferably a material having higher hardness than the cylindrical body 5. Alternatively, by forming an annular recess on the outer peripheral surface of the cylindrical body 5, the portion corresponding to the non-magnetic portion 5c can be made thinner.
　電磁コイル２９は、樹脂材料で筒状に形成されたボビン３１に巻回され、筒状体５の外周側に外挿されている。電磁コイル２９はコネクタ４１に設けられたターミナル４３に電気的に接続されている。電磁コイル２９、ボビン３１及びターミナル４３等によってコイル装置７０が構成される。コネクタ４１には図示しない外部の駆動回路が接続され、ターミナル４３を介して、電磁コイル２９に駆動電流が通電される。 The electromagnetic coil 29 is wound around a bobbin 31 formed in a cylindrical shape with a resin material and is extrapolated to the outer peripheral side of the cylindrical body 5. The electromagnetic coil 29 is electrically connected to a terminal 43 provided on the connector 41. A coil device 70 is constituted by the electromagnetic coil 29, the bobbin 31, the terminal 43, and the like. An external drive circuit (not shown) is connected to the connector 41, and a drive current is passed through the electromagnetic coil 29 via the terminal 43.
　固定鉄心２５は、磁性金属材料からなる。固定鉄心２５は筒状に形成され、中心部を中心軸線１ａに沿う方向に貫通する貫通孔２５ａを有する。固定鉄心２５は、筒状体５の小径部５ｂの基端側に圧入固定され、筒状体５の中間部に位置している。小径部５ｂの基端側に大径部５ａが設けられていることにより、固定鉄心２５の組付けが容易になる。固定鉄心２５は溶接により筒状体５に固定してもよいし、溶接と圧入を併用して筒状体５に固定してもよい。 The fixed iron core 25 is made of a magnetic metal material. The fixed iron core 25 is formed in a cylindrical shape, and has a through hole 25a that penetrates the central portion in a direction along the central axis 1a. The fixed iron core 25 is press-fitted and fixed to the proximal end side of the small-diameter portion 5 b of the cylindrical body 5, and is positioned at the intermediate portion of the cylindrical body 5. Since the large diameter portion 5a is provided on the base end side of the small diameter portion 5b, the fixed iron core 25 can be easily assembled. The fixed iron core 25 may be fixed to the cylindrical body 5 by welding, or may be fixed to the cylindrical body 5 by using welding and press fitting together.
　可動子２７は、基端側に大径部２７ａが形成されており、この大径部２７ａが固定鉄心２５と対向する可動鉄心２７ａを構成する。可動子２７の可動鉄心２７ａに対して先端側には小径部２７ｂ（軸部１７ｂ）が形成されており、この小径部２７ｂの先端に弁体１７が形成されている。この小径部２７ｂは可動鉄心２７ａと弁体１７とを接続する接続部２７ｂを構成する。本実施例では、可動鉄心２７ａと接続部２７ｂとを一体（同一材料からなる一部材）に形成しているが、二つの部材を接合して構成してもよい。本実施例では、可動子２７は可動鉄心２７ａと小径部２７ｂ（軸部１７ｂ）と弁体１７とで構成される。 The movable element 27 has a large-diameter portion 27 a formed on the proximal end side, and the large-diameter portion 27 a constitutes a movable iron core 27 a that faces the fixed iron core 25. A small diameter portion 27b (shaft portion 17b) is formed on the distal end side with respect to the movable iron core 27a of the mover 27, and the valve body 17 is formed at the distal end of the small diameter portion 27b. The small diameter portion 27b constitutes a connection portion 27b that connects the movable iron core 27a and the valve body 17. In this embodiment, the movable iron core 27a and the connecting portion 27b are integrally formed (one member made of the same material), but two members may be joined. In the present embodiment, the mover 27 includes a movable iron core 27a, a small diameter portion 27b (shaft portion 17b), and a valve body 17.
　上述したように本実施例では、可動鉄心２７ａは、弁体１７と連結され、固定鉄心２５との間に作用する磁気吸引力によって、弁体１７を開閉弁方向に駆動する部材である。 As described above, in the present embodiment, the movable iron core 27a is a member that is connected to the valve body 17 and drives the valve body 17 in the opening / closing valve direction by the magnetic attraction acting between the fixed iron core 25 and the movable iron core 27a.
　また、可動鉄心２７ａの外周面が筒状体５の内周面に接触することにより、可動子２７は中心軸線１ａに沿う方向（開閉弁方向）における移動を案内される。この場合、上述した非磁性部５ｃは非磁性化処理によりその硬度を高めるとよい。或いは、筒状体５の他の部分よりも硬度の高い非磁性部材（筒状体）を使用して非磁性部５ｃを構成するとよい。そして、この非磁性部５ｃで可動鉄心２７ａの外周部を案内する案内面（支持面）を構成するとよい。これにより、可動鉄心２７ａの外周部が摺動する筒状体５側の摺動面の耐摩耗性を高めることができる。 Further, when the outer peripheral surface of the movable iron core 27a comes into contact with the inner peripheral surface of the cylindrical body 5, the mover 27 is guided to move in the direction along the central axis 1a (the on-off valve direction). In this case, the hardness of the nonmagnetic portion 5c described above may be increased by a demagnetization process. Or it is good to comprise the nonmagnetic part 5c using the nonmagnetic member (cylindrical body) whose hardness is higher than the other part of the cylindrical body 5. FIG. And it is good to comprise the guide surface (support surface) which guides the outer peripheral part of the movable iron core 27a with this nonmagnetic part 5c. Thereby, the abrasion resistance of the sliding surface by the side of the cylindrical body 5 which the outer peripheral part of the movable iron core 27a slides can be improved.
　可動鉄心２７ａには、固定鉄心２５と対向する端面に開口する凹部２７ｃが中心軸線１ａ方向に形成されている。凹部２７ｃの底面にはスプリング（コイルばね）３９のばね座となる環状面２７ｅが形成されている。環状面２７ｅの内周側には中心軸線１ａに沿って小径部（接続部）２７ｂの先端側端部まで貫通する貫通孔２７ｆが形成されている。また、小径部２７ｂには側面に開口部２７ｄが形成されている。小径部２７ｂの外周面と筒状体５の内周面との間には背圧室３７が形成されている。貫通孔２７ｆが凹部２７ｃの底面に開口し、開口部２７ｄが小径部２７ｂの外周面に開口することにより、可動子２７の内部に、可動子２７の基端部側と可動子２７の側面部に形成された背圧室３７とを連通する燃料流路３が構成される。 In the movable iron core 27a, a concave portion 27c that opens to an end surface facing the fixed iron core 25 is formed in the direction of the central axis 1a. An annular surface 27e serving as a spring seat of a spring (coil spring) 39 is formed on the bottom surface of the recess 27c. A through hole 27f is formed on the inner peripheral side of the annular surface 27e so as to penetrate the distal end side end of the small diameter portion (connecting portion) 27b along the central axis 1a. The small diameter portion 27b has an opening 27d on the side surface. A back pressure chamber 37 is formed between the outer peripheral surface of the small diameter portion 27 b and the inner peripheral surface of the cylindrical body 5. The through hole 27f opens at the bottom surface of the recess 27c, and the opening 27d opens at the outer peripheral surface of the small diameter portion 27b, so that the base end side of the mover 27 and the side surface of the mover 27 are formed inside the mover 27 The fuel flow path 3 is formed to communicate with the back pressure chamber 37 formed in the above.
　可動鉄心２７ａの凹部２７ｃと背圧室３７とを連通する燃料通路は、上記した構成に限らず、凹部２７ｃから小径部２７ｂの貫通孔２７ｆを介することなく直接背圧室３７に連通するように形成してもよい。この場合、小径部２７ｂの貫通孔２７ｆは不要となり、小径部２７ｂを円柱状に形成してもよい。 The fuel passage that communicates the concave portion 27c of the movable iron core 27a and the back pressure chamber 37 is not limited to the above-described configuration, and communicates directly from the concave portion 27c to the back pressure chamber 37 without passing through the through hole 27f of the small diameter portion 27b. It may be formed. In this case, the through hole 27f of the small diameter portion 27b is not necessary, and the small diameter portion 27b may be formed in a columnar shape.
　固定鉄心２５の貫通孔２５ａと可動鉄心２７ａの凹部２７ｃとに跨って、コイルばね３９が圧縮状態で配設されている。コイルばね３９は、可動子２７を、弁体１７が弁座１５ｂに当接する方向（閉弁方向）に付勢する付勢部材として機能している。 A coil spring 39 is disposed in a compressed state across the through hole 25a of the fixed iron core 25 and the recess 27c of the movable iron core 27a. The coil spring 39 functions as a biasing member that biases the movable element 27 in a direction (valve closing direction) in which the valve element 17 contacts the valve seat 15b.
　固定鉄心２５の貫通孔２５ａの内側にはアジャスタ（調整子）３５が配設されており、コイルばね３９の基端側端部はアジャスタ３５の先端側端面に当接している。中心軸線１ａに沿う方向におけるアジャスタ３５の貫通孔２５ａ内での位置を調整することにより、コイルばね３９による可動子２７（すなわち弁体１７）の付勢力が調整される。アジャスタ３５は、中心部を中心軸線１ａに沿う方向に貫通する燃料流路３を有する。燃料は、アジャスタ３５の燃料流路３を流れた後、固定鉄心２５の貫通孔２５ａの先端側部分の燃料流路３に流れ、可動子２７内に構成された燃料流路３に流れる。 An adjuster (adjuster) 35 is disposed inside the through hole 25 a of the fixed iron core 25, and the proximal end side end portion of the coil spring 39 is in contact with the distal end side end surface of the adjuster 35. By adjusting the position of the adjuster 35 in the through hole 25a in the direction along the central axis 1a, the urging force of the movable element 27 (that is, the valve body 17) by the coil spring 39 is adjusted. The adjuster 35 has a fuel flow path 3 that penetrates the central portion in a direction along the central axis 1a. After flowing through the fuel flow path 3 of the adjuster 35, the fuel flows into the fuel flow path 3 at the tip side portion of the through hole 25 a of the fixed iron core 25, and then flows into the fuel flow path 3 configured in the mover 27.
　ヨーク３３は、磁性を有する金属材料でできており、燃料噴射弁１のハウジングを兼ねている。ヨーク３３は大径部３３ａと小径部３３ｂとを有する段付きの筒状に形成されている。大径部３３ａは電磁コイル２９の外周を覆って円筒形状を成しており、大径部３３ａの先端側に大径部３３ａよりも小径の小径部３３ｂが形成されている。小径部３３ｂは筒状体５の小径部５ｂの外周に圧入又は挿入されている。これにより、小径部３３ｂの内周面は筒状体５の外周面に緊密に接触している。このとき、小径部３３ｂの内周面の少なくとも一部は、可動鉄心２７ａの外周面と筒状体５を介して対向しており、この対向部分における閉磁路の磁気抵抗を小さくしている。 The yoke 33 is made of a magnetic metal material and also serves as a housing for the fuel injection valve 1. The yoke 33 is formed in a stepped cylindrical shape having a large diameter portion 33a and a small diameter portion 33b. The large diameter portion 33a has a cylindrical shape covering the outer periphery of the electromagnetic coil 29, and a small diameter portion 33b having a smaller diameter than the large diameter portion 33a is formed on the distal end side of the large diameter portion 33a. The small diameter portion 33 b is press-fitted or inserted into the outer periphery of the small diameter portion 5 b of the cylindrical body 5. Thereby, the inner peripheral surface of the small diameter portion 33 b is in close contact with the outer peripheral surface of the cylindrical body 5. At this time, at least a part of the inner peripheral surface of the small-diameter portion 33b is opposed to the outer peripheral surface of the movable iron core 27a via the cylindrical body 5, and the magnetic resistance of the closed magnetic path at this facing portion is reduced.
　ヨーク３３の先端側端部の外周面には周方向に沿って環状凹部３３ｃが形成されている。環状凹部３３ｃの底面に形成された薄肉部において、ヨーク３３と筒状体５とがレーザ溶接２４により全周に亘って接合されている。ヨーク３３は、その先端側端部が弁座部材１５の基端側端部に対して先端側に位置している。このため、ヨーク３３と弁座部材１５とが中心軸線１ａに沿う方向において重複する範囲に設けられており、筒状体５の先端部を補強している。なお、弁座部材１５のレーザ溶接部１９はヨーク３３の先端側端部よりもさらに先端側に位置しており、弁座部材１５とヨーク３３との組み付け順序に制約が生じないようにしている。 An annular recess 33c is formed along the circumferential direction on the outer peripheral surface of the end portion on the front end side of the yoke 33. In the thin part formed in the bottom face of the annular recess 33 c, the yoke 33 and the cylindrical body 5 are joined over the entire circumference by laser welding 24. The yoke 33 has a distal end side end located on the distal end side with respect to the proximal end side end of the valve seat member 15. For this reason, the yoke 33 and the valve seat member 15 are provided in an overlapping range in the direction along the central axis 1a, and the tip of the cylindrical body 5 is reinforced. Note that the laser welding portion 19 of the valve seat member 15 is located further to the front end side than the end portion on the front end side of the yoke 33 so that the assembly order of the valve seat member 15 and the yoke 33 is not restricted. .
　筒状体５の先端部にはフランジ部４９ａを有する円筒状のプロテクタ４９が外挿され、筒状体５の先端部がプロテクタ４９によって保護されている。プロテクタ４９はヨーク３３のレーザ溶接部２４の上を覆っている。 A cylindrical protector 49 having a flange portion 49 a is extrapolated to the distal end portion of the cylindrical body 5, and the distal end portion of the cylindrical body 5 is protected by the protector 49. The protector 49 covers the top of the laser welding portion 24 of the yoke 33.
　プロテクタ４９のフランジ部４９ａと、ヨーク３３の小径部３３ｂと、ヨーク３３の大径部３３ａと小径部３３ｂとの段差面とによって環状溝３４が形成され、環状溝３４にＯリング４６が外挿されている。Ｏリング４６は、燃料噴射弁１が内燃機関に取り付けられる際に、内燃機関側に形成された挿入口の内周面とヨーク３３における小径部３３ｂの外周面との間で液密及び気密を確保するシールとして機能する。 An annular groove 34 is formed by the flange portion 49a of the protector 49, the small diameter portion 33b of the yoke 33, and the step surface of the large diameter portion 33a and the small diameter portion 33b of the yoke 33, and an O-ring 46 is extrapolated to the annular groove 34. Has been. When the fuel injection valve 1 is attached to the internal combustion engine, the O-ring 46 is liquid-tight and air-tight between the inner peripheral surface of the insertion port formed on the internal combustion engine side and the outer peripheral surface of the small-diameter portion 33b of the yoke 33. Acts as a seal to ensure.
　燃料噴射弁１の中間部から基端側端部の近傍までを、樹脂カバー４７がモールドされて被覆している。樹脂カバー４７の先端側端部はヨーク３３の大径部３３ａの基端側の一部を被覆している。また、樹脂カバー４７は電磁コイル２９とターミナル４３とを接続する配線部材を被覆し、樹脂カバー４７によりコネクタ４１が一体的に形成されている。 The resin cover 47 is molded and covered from the middle portion of the fuel injection valve 1 to the vicinity of the proximal end portion. The end portion on the front end side of the resin cover 47 covers a part of the base end side of the large diameter portion 33 a of the yoke 33. The resin cover 47 covers a wiring member that connects the electromagnetic coil 29 and the terminal 43, and the connector 41 is integrally formed by the resin cover 47.
　次に、燃料噴射弁１の動作について説明する。 Next, the operation of the fuel injection valve 1 will be described.
　電磁コイル２９が非通電状態にあり電磁コイル２９に駆動電流が流れていない場合、可動子２７はコイルばね３９により閉弁方向に付勢され、弁体１７が弁座１５ｂに当接（着座）した状態にある。この場合、固定鉄心２５の先端側端面と可動鉄心２７ａの基端側端面との間には、ギャップδが存在する。なお、本実施例では、このギャップδは可動子２７（すなわち弁体１７）のストロークに等しい。 When the electromagnetic coil 29 is in a non-energized state and no drive current flows through the electromagnetic coil 29, the mover 27 is urged in the valve closing direction by the coil spring 39, and the valve element 17 abuts (seats) the valve seat 15b. Is in a state. In this case, a gap δ exists between the distal end side end surface of the fixed iron core 25 and the proximal end side end surface of the movable iron core 27a. In this embodiment, the gap δ is equal to the stroke of the mover 27 (that is, the valve body 17).
　電磁コイル２９が通電状態に切り替わり電磁コイル２９に駆動電流が流れると、可動鉄心２７ａと固定鉄心２５とヨーク３３とによって構成される閉磁路に磁束が発生する。この磁束により、ギャップδを挟んで対向する固定鉄心２５と可動鉄心２７ａとの間に磁気吸引力が発生する。この磁気吸引力が、コイルばね３９による付勢力や、可動子２７に対して閉弁方向に作用する燃料圧力などの合力に打ち勝つと、可動子が開弁方向に移動し始める。可動子２７が開弁方向にギャップδに等しい距離δだけ移動して固定鉄心２５に当接すると、可動鉄心２７ａは開弁方向への移動を止められ、開弁して静止した状態に至る。 When the electromagnetic coil 29 is switched to the energized state and a drive current flows through the electromagnetic coil 29, a magnetic flux is generated in a closed magnetic path formed by the movable iron core 27a, the fixed iron core 25, and the yoke 33. Due to this magnetic flux, a magnetic attractive force is generated between the fixed iron core 25 and the movable iron core 27a facing each other across the gap δ. When this magnetic attraction force overcomes the urging force of the coil spring 39 or the resultant force such as the fuel pressure acting on the mover 27 in the valve closing direction, the mover starts moving in the valve opening direction. When the movable element 27 moves in the valve opening direction by a distance δ equal to the gap δ and comes into contact with the fixed iron core 25, the movable iron core 27a is stopped from moving in the valve opening direction, and is opened to reach a stationary state.
　可動子２７が開弁方向に移動して弁体１７が弁座１５ｂから離れると、弁体１７と弁座１５ｂとの間に隙間（燃料流路）が形成され、燃料導入孔１５ｅを通じて燃料室２１ａに燃料が流れる。燃料導入孔１５ｅから燃料室２１ａに供給された燃料は、燃料室２１ａの中央部から径方向外側に向かって流れ、燃料噴射孔１１０の入口開口から燃料噴射孔１１０の内部に流入し、出口開口より燃料噴射弁１の外部に噴射される。 When the movable element 27 moves in the valve opening direction and the valve body 17 is separated from the valve seat 15b, a gap (fuel flow path) is formed between the valve body 17 and the valve seat 15b, and the fuel chamber is formed through the fuel introduction hole 15e. Fuel flows into 21a. The fuel supplied from the fuel introduction hole 15e to the fuel chamber 21a flows radially outward from the central portion of the fuel chamber 21a, flows into the fuel injection hole 110 from the inlet opening of the fuel injection hole 110, and exits from the outlet opening. The fuel is injected outside the fuel injection valve 1.
　電磁コイル２９の通電を打ち切ると、磁気吸引力が減少し、やがて消失する。この段階で、磁気吸引力がコイルばね３９の付勢力よりも小さくなると、可動子２７が閉弁方向へ移動を開始する。弁体１７が弁座１５ｂに当接すると、弁体１７は弁部７を閉弁して静止した状態に至る。 When the energization of the electromagnetic coil 29 is cut off, the magnetic attractive force decreases and eventually disappears. At this stage, when the magnetic attractive force becomes smaller than the biasing force of the coil spring 39, the mover 27 starts to move in the valve closing direction. When the valve element 17 comes into contact with the valve seat 15b, the valve element 17 closes the valve portion 7 and comes to a stationary state.
　可動子２７が開弁方向に移動して弁体１７が弁座１５ｂから離れ始める時点から、可動子２７が閉弁方向へ移動して弁体１７が再び弁座１５ｂに当接する時点までを開弁時（開弁状態）と呼び、弁体１７が弁座１５ｂに当接して閉弁している間を閉弁時（閉弁状態）と呼ぶ。 The time from when the movable element 27 moves in the valve opening direction and the valve body 17 starts to move away from the valve seat 15b to the time when the movable element 27 moves in the valve closing direction and the valve element 17 contacts the valve seat 15b again is opened. When the valve is closed (valve open state), the time when the valve element 17 is in contact with the valve seat 15b and is closed is called the valve closed time (valve closed state).
　なお、可動鉄心２７ａと固定鉄心２５との間に作用するスクイズ力を低減するために、可動鉄心２７ａの固定鉄心２５と対向する端面に突起を設ける場合がある。このような場合は、弁体１７の移動距離（ストローク）はギャップδから突起高さを差し引いた大きさになる。また、可動鉄心２７ａと固定鉄心２５とが接触する前に、可動子２７の開弁方向への移動を制限するストッパを設ける場合もある。 In addition, in order to reduce the squeeze force which acts between the movable iron core 27a and the fixed iron core 25, a protrusion may be provided on the end surface of the movable iron core 27a facing the fixed iron core 25. In such a case, the moving distance (stroke) of the valve body 17 is a size obtained by subtracting the protrusion height from the gap δ. Moreover, before the movable iron core 27a and the fixed iron core 25 contact, the stopper which restrict | limits the movement to the valve opening direction of the needle | mover 27 may be provided.
　次に、図２及び図４を用いて、弁体１７の構成について、詳細に説明する。図４は、図１に示すノズル部８の近傍を拡大して示す断面図（図３のＩＩ－ＩＩ矢視断面図）である。図２は閉弁状態を示しているのに対して、図４は開弁状態を示している。 Next, the configuration of the valve element 17 will be described in detail with reference to FIGS. 2 and 4. 4 is an enlarged cross-sectional view (sectional view taken along the line II-II in FIG. 3) showing the vicinity of the nozzle portion 8 shown in FIG. FIG. 2 shows the valve closed state, whereas FIG. 4 shows the valve opened state.
　図２において、弁体１７のシート部１７ａ及び弁座１５ｂから下流側の弁体１７と弁座部材１５とによって囲まれた空間（燃料溜まり）３ａと、燃料導入孔１５ｅの内側の空間（燃料溜まり）３ｂと、燃料室２１ａの空間（燃料溜まり）３ｃとは、燃料噴射後に燃料が残留するデッドボリュームを形成する。 In FIG. 2, a space (fuel reservoir) 3a surrounded by the valve body 17 and the valve seat member 15 on the downstream side from the seat portion 17a and the valve seat 15b of the valve body 17 and a space (fuel) inside the fuel introduction hole 15e. The reservoir 3b and the space (fuel reservoir) 3c of the fuel chamber 21a form a dead volume in which fuel remains after fuel injection.
　本実施例では、弁体１７の先端部に突状部１７ｃが設けられている。突状部１７ｃの先端部（先端面）は、閉弁時においては、弁座部材１５の下端面１５ｔよりも下方に位置し、燃料導入孔１５ｅを貫通して燃料室２１ａに突き出している。ノズルプレート２１ｎには外方に向けて突状を成す突状部２１ｎａが形成され、突状部２１ｎａの内側に燃料室２１ａが構成されている。突状部１７ｃの先端部の燃料室２１ａ内への突き出し量（寸法）をｄ１とする。燃料室２１ａの高さ寸法ｈ１は突き出し寸法ｄ１よりも大きい。 In this embodiment, a protruding portion 17c is provided at the tip of the valve body 17. The front end portion (front end surface) of the projecting portion 17c is located below the lower end surface 15t of the valve seat member 15 when the valve is closed, and penetrates the fuel introduction hole 15e and protrudes into the fuel chamber 21a. The nozzle plate 21n is formed with a protruding portion 21na that protrudes outward, and a fuel chamber 21a is formed inside the protruding portion 21na. A protruding amount (dimension) of the tip of the protruding portion 17c into the fuel chamber 21a is d1. The height dimension h1 of the fuel chamber 21a is larger than the protruding dimension d1.
　図４に示すように、開弁時には弁体１７が弁座１５ｂから離間するように持ち上げられ、弁体１７のシート部１７ａと弁座１５ｂとの間に可動子２７のストロークに相当する隙間ｄｓができる。突状部１７ｃの先端部は円柱状或いは円盤状を成し、先端面は円形を成している。突状部１７ｃの外周面１７ｇと燃料導入孔１５ｅの内周面との間には環状の燃料通路２００が形成されている。環状の燃料通路２００の総断面積Ｓ２は、開弁時に弁体１７のシート部１７ａと弁座１５ｂとの間に形成される燃料通路の総断面積Ｓ１よりも大きくなるように構成されている。 As shown in FIG. 4, when the valve is opened, the valve body 17 is lifted away from the valve seat 15b, and a gap ds corresponding to the stroke of the mover 27 is provided between the seat portion 17a of the valve body 17 and the valve seat 15b. Can do. The tip of the projecting portion 17c has a columnar shape or a disc shape, and the tip surface has a circular shape. An annular fuel passage 200 is formed between the outer peripheral surface 17g of the protruding portion 17c and the inner peripheral surface of the fuel introduction hole 15e. The total cross-sectional area S2 of the annular fuel passage 200 is configured to be larger than the total cross-sectional area S1 of the fuel passage formed between the seat portion 17a of the valve body 17 and the valve seat 15b when the valve is opened. .
　本実施例では、開弁時に、突状部１７ｃの先端面と弁座部材１５の下端面１５ｔとが同じ高さ位置になるようにしている。突状部１７ｃの先端面と弁座部材１５の下端面１５ｔとは開弁時に同じ高さ位置になる必要はないが、少なくとも同じ高さ位置から下方に位置することが望ましい。これは、突状部１７ｃの外周面が燃料を燃料室２１ａに誘導する流路面として機能するためである。 In this embodiment, when the valve is opened, the front end surface of the projecting portion 17c and the lower end surface 15t of the valve seat member 15 are positioned at the same height. The tip end surface of the projecting portion 17c and the lower end surface 15t of the valve seat member 15 do not need to be at the same height position when the valve is opened, but are desirably positioned at least downward from the same height position. This is because the outer peripheral surface of the protruding portion 17c functions as a flow path surface that guides fuel to the fuel chamber 21a.
　弁体１７のシート部１７ａの近傍は、軸部１７ｂの下流端部に形成された曲面部１７ｄと、曲面部１７ｄの下流側に形成されたテーパー部１７ｅと、テーパー部１７ｅの下流端部に形成された曲面部１７ｆと、曲面部１７ｆの下流側に形成された円筒面部１７ｇとで構成されている。 In the vicinity of the seat portion 17a of the valve body 17, a curved surface portion 17d formed on the downstream end portion of the shaft portion 17b, a tapered portion 17e formed on the downstream side of the curved surface portion 17d, and a downstream end portion of the tapered portion 17e. The curved surface portion 17f is formed, and the cylindrical surface portion 17g is formed on the downstream side of the curved surface portion 17f.
　曲面部１７ｄは燃料通路側に突状となる曲面で構成されており、軸部１７ｂの外周面とテーパー面１７ｅとを接続する。曲面部１７ｄの曲面は図４の断面上において円弧形状を成す。 The curved surface portion 17d is formed of a curved surface that protrudes toward the fuel passage, and connects the outer peripheral surface of the shaft portion 17b and the tapered surface 17e. The curved surface of the curved surface portion 17d has an arc shape on the cross section of FIG.
　曲面部１７ｆは燃料通路側から弁体内部に向かって凹状となる曲面で構成されており、テーパー面１７ｅと突状部１７ｃの円筒面部１７ｇとを接続する。曲面部１７ｆの曲面は図４の断面上において円弧形状を成す。 The curved surface portion 17f is formed of a curved surface that is concave from the fuel passage side toward the inside of the valve body, and connects the tapered surface 17e and the cylindrical surface portion 17g of the projecting portion 17c. The curved surface of the curved surface portion 17f has an arc shape on the cross section of FIG.
　燃料２０１は、燃料シート部に向かう絞り流路に流入し、流速が高められる。曲面部１７ｄを通過した燃料は、シート部１７ａと弁座１５ｂとの間に形成される燃料通路を流下し、燃料導入孔１５ｅに至る。燃料導入孔１５ｅよりも上流側には曲面部１７ｆが形成されており、燃料導入孔１５ｅの上流側で燃料の流れる方向を中心軸線１ａに沿う方向２０２に誘導する。 The fuel 201 flows into the throttle channel toward the fuel seat portion, and the flow velocity is increased. The fuel that has passed through the curved surface portion 17d flows down the fuel passage formed between the seat portion 17a and the valve seat 15b, and reaches the fuel introduction hole 15e. A curved surface portion 17f is formed on the upstream side of the fuel introduction hole 15e, and the direction in which the fuel flows on the upstream side of the fuel introduction hole 15e is guided in a direction 202 along the central axis 1a.
　燃料導入孔１５ｅの内側に形成された環状の燃料通路２００では、総断面積Ｓ２が燃料シート部の総断面積Ｓ１よりも大きいので、この部分で燃料流に生じる圧損を抑制することができる。従って、燃料流は流速の低下を抑制して、大きな流速を維持することができる。 In the annular fuel passage 200 formed inside the fuel introduction hole 15e, since the total cross-sectional area S2 is larger than the total cross-sectional area S1 of the fuel seat portion, the pressure loss generated in the fuel flow at this portion can be suppressed. Therefore, the fuel flow can suppress a decrease in the flow rate and can maintain a large flow rate.
　突状部１７ｃの円筒面部１７ｇは中心軸線１ａに沿う方向に流れの向きを変えた燃料を燃料室２１ａまで誘導する。曲面部１７ｆ及び円筒面部１７ｇが燃料流の向きを変え、燃料を燃料室２１ａまで誘導するので、燃料は大きな流速を維持して燃料室２１ａに流入することができる。曲面部１７ｆ及び円筒面部１７ｇは燃料の流れを案内するガイド面として機能する。曲面部１７ｆはテーパー面で構成されてもよいが、曲面、できれば図４に示す断面上で円弧面を成している方が、燃料流れの向きをスムーズに変えることができる。 The cylindrical surface portion 17g of the projecting portion 17c guides the fuel whose direction of flow is changed along the central axis 1a to the fuel chamber 21a. Since the curved surface portion 17f and the cylindrical surface portion 17g change the direction of the fuel flow and guide the fuel to the fuel chamber 21a, the fuel can flow into the fuel chamber 21a while maintaining a large flow velocity. The curved surface portion 17f and the cylindrical surface portion 17g function as a guide surface that guides the flow of fuel. The curved surface portion 17f may be formed of a tapered surface, but the direction of the fuel flow can be changed smoothly if the curved surface, preferably the arc surface on the cross section shown in FIG.
　燃料室２１ａに流入した燃料は大きな流速で燃料室２１ａを外方に向かって流れ、燃料噴射孔１１０に流入する。これにより、燃料噴射孔１１０から噴射される燃料は大きな流速を維持することができ、噴霧の微粒化性能が向上する。 The fuel that has flowed into the fuel chamber 21a flows outward through the fuel chamber 21a at a large flow velocity and flows into the fuel injection hole 110. Thereby, the fuel injected from the fuel injection hole 110 can maintain a large flow velocity, and the atomization performance of the spray is improved.
　また、突状部１７ｃは、デッドボリューム３ａ，３ｂ，３ｃの体積の低減に寄与する。デッドボリューム３ａ，３ｂ，３ｃの体積の低減するためには、開弁時においても突状部１７ｃの先端部が燃料室２１ａに突出するようにすることが好ましい。すなわち、突状部１７ｃの突き出し寸法ｄ１を可動子２７のストロークδよりも大きくするとよい。 Also, the projecting portion 17c contributes to a reduction in the volume of the dead volumes 3a, 3b, 3c. In order to reduce the volume of the dead volumes 3a, 3b, 3c, it is preferable that the tip of the protruding portion 17c protrudes into the fuel chamber 21a even when the valve is opened. In other words, the protrusion dimension d1 of the protrusion 17c is preferably larger than the stroke δ of the mover 27.
　デッドボリューム３ａ，３ｂ，３ｃの体積が大きくなると、燃料が噴射される空間が大気圧下にある場合と負圧下にある場合とで、燃料噴射量の変化が大きくなる。本実施例によれば、突状部１７ｃにより、上述した３つの空間（燃料溜まり）３ａ，３ｂ，３ｃの体積をそれぞれ低減することができ、燃料が噴射される空間の圧力が変化しても、燃料噴射量の変化を抑制することができる。 When the volume of the dead volumes 3a, 3b, 3c is increased, the change in the fuel injection amount is increased depending on whether the space in which the fuel is injected is at atmospheric pressure or negative pressure. According to the present embodiment, the volumes of the three spaces (fuel reservoirs) 3a, 3b, 3c described above can be reduced by the projecting portion 17c, and even if the pressure of the space into which the fuel is injected changes. The change in the fuel injection amount can be suppressed.
　なお、本発明は上記した実施例に限定されるものではなく、一部の構成の削除や、記載されていない他の構成の追加が可能である。 It should be noted that the present invention is not limited to the above-described embodiments, and some components can be deleted or other components not described can be added.

Claims (4)

  1. 　弁座と前記弁座の下流側に形成され下端面を貫通する燃料導入孔とを有する弁座部材と、前記弁座と協働して燃料通路を開閉する弁体と、燃料導入孔の内周面よりも径方向外方に燃料噴射孔が形成され前記弁座部材の前記下端面に固定されたノズル部材とを備え、前記ノズル部材は外方に向かって突状を成す突状部を有し、前記突状部の内側に前記燃料導入孔から流入した燃料を径方向外方に向かって流す燃料拡散室が形成された燃料噴射弁において、
    　前記弁体の先端部に突状部を有し、
    　前記突状部は閉弁時に前記燃料導入孔を貫通して前記燃料拡散室側に突出していることを特徴とする燃料噴射弁。     A valve seat member having a valve seat and a fuel introduction hole formed downstream of the valve seat and penetrating a lower end surface; a valve body for opening and closing a fuel passage in cooperation with the valve seat; A fuel injection hole formed radially outward from the circumferential surface and a nozzle member fixed to the lower end surface of the valve seat member, the nozzle member having a protruding portion that protrudes outward. A fuel injection valve in which a fuel diffusion chamber is formed on the inside of the projecting portion so that the fuel flowing from the fuel introduction hole flows radially outward;
    Having a protrusion at the tip of the valve body;
    The fuel injection valve according to claim 1, wherein the projecting portion penetrates the fuel introduction hole and projects toward the fuel diffusion chamber when the valve is closed.
  2. 　請求項１に記載の燃料噴射弁において、
    　前記突状部の外周面と前記燃料導入孔の内周面との間に環状の燃料通路が形成されており、前記環状の燃料通路の総断面積は、開弁時に前記弁座と前記弁体とが成す燃料シート部に形成される燃料通路の総断面積よりも大きいことを特徴とする燃料噴射弁。     The fuel injection valve according to claim 1, wherein
    An annular fuel passage is formed between the outer peripheral surface of the projecting portion and the inner peripheral surface of the fuel introduction hole, and the total cross-sectional area of the annular fuel passage is the valve seat and the valve when the valve is opened. A fuel injection valve characterized in that the fuel injection valve is larger than a total cross-sectional area of a fuel passage formed in a fuel seat portion formed by the body.
  3. 　請求項２に記載の燃料噴射弁において、
    　前記突状部は、先端側の外周面が円筒面で構成されると共に、前記燃料シート部の下流側にテーパー面が形成されており、前記テーパー面と前記円筒面とが曲面で接続されていることを特徴とする燃料噴射弁。     The fuel injection valve according to claim 2,
    The protrusion has an outer peripheral surface on the tip side formed of a cylindrical surface, a tapered surface is formed on the downstream side of the fuel seat portion, and the tapered surface and the cylindrical surface are connected by a curved surface. A fuel injection valve characterized by comprising:
  4. 　請求項３に記載の燃料噴射弁において、
    　前記弁体の前記突状部は、開弁時においても前記燃料拡散室側に突出していることを特徴とする燃料噴射弁。     The fuel injection valve according to claim 3,
    The fuel injection valve, wherein the protruding portion of the valve body protrudes toward the fuel diffusion chamber even when the valve is opened.
PCT/JP2015/065002 2014-09-18 2015-05-26 Fuel injection valve WO2016042847A1 (en)

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Publication number Priority date Publication date Assignee Title
CN107165755A (en) * 2017-07-03 2017-09-15 浙江凯利智控科技有限公司 Fuel injector atomization characteristics can adjust cone structure
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006177174A (en) * 2004-12-20 2006-07-06 Toyota Central Res & Dev Lab Inc Fuel injection valve
JP2013522535A (en) * 2010-03-22 2013-06-13 デルファイ・テクノロジーズ・ホールディング・エス．アー．エール．エル． Injection nozzle
JP2013234598A (en) * 2012-05-08 2013-11-21 Nippon Soken Inc Fuel injection valve

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001046919A (en) * 1999-08-06 2001-02-20 Denso Corp Fluid injection nozzle
US6360960B1 (en) * 2000-05-17 2002-03-26 Siemens Automotive Corporation Fuel injector sac volume reducer
DE10118164B4 (en) * 2001-04-11 2007-02-08 Robert Bosch Gmbh Fuel injector
DE102004060530A1 (en) * 2004-12-16 2006-06-22 Robert Bosch Gmbh Fuel injection valve for mixture-compressing foreign-ignited internal combustion engine, has breaker plate with hose openings and arranged downstream of valve seat, where openings designed as micro holes have diameter of preset value
JP4185045B2 (en) * 2004-12-22 2008-11-19 株式会社日立製作所 Fuel injection valve
KR100933407B1 (en) * 2007-03-27 2009-12-24 미쓰비시덴키 가부시키가이샤 Fuel injection valve
JP2009162239A (en) * 2009-04-27 2009-07-23 Nippon Soken Inc Fuel injection valve and internal combustion engine
US9556842B2 (en) * 2012-02-15 2017-01-31 Toyota Jidosha Kabushiki Kaisha Fuel injection valve, and fuel injection apparatus provided with the same
JP2014066186A (en) * 2012-09-26 2014-04-17 Hitachi Automotive Systems Ltd Fuel injection valve
JP2014077385A (en) * 2012-10-10 2014-05-01 Toyota Motor Corp Fuel injection valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006177174A (en) * 2004-12-20 2006-07-06 Toyota Central Res & Dev Lab Inc Fuel injection valve
JP2013522535A (en) * 2010-03-22 2013-06-13 デルファイ・テクノロジーズ・ホールディング・エス．アー．エール．エル． Injection nozzle
JP2013234598A (en) * 2012-05-08 2013-11-21 Nippon Soken Inc Fuel injection valve

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