WO2023218736A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
WO2023218736A1
WO2023218736A1 PCT/JP2023/007719 JP2023007719W WO2023218736A1 WO 2023218736 A1 WO2023218736 A1 WO 2023218736A1 JP 2023007719 W JP2023007719 W JP 2023007719W WO 2023218736 A1 WO2023218736 A1 WO 2023218736A1
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WO
WIPO (PCT)
Prior art keywords
fuel
passage
fuel injection
swirling
injection valve
Prior art date
Application number
PCT/JP2023/007719
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English (en)
Japanese (ja)
Inventor
昭宏 山▲崎▼
貴博 齋藤
茂生 久芳
栄治 田村
Original Assignee
日立Astemo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Astemo株式会社 filed Critical 日立Astemo株式会社
Publication of WO2023218736A1 publication Critical patent/WO2023218736A1/fr

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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 generates swirling fuel upstream of a fuel injection hole and injects the swirling fuel from the fuel injection hole.
  • Patent Document 1 discloses that fuel that flows into the fuel injection hole without sufficiently swirling in the swirling chamber forms a spray with a small spray angle and long penetration, and that the fuel flows into the fuel injection hole after sufficiently swirling in the swirling chamber.
  • a technique is disclosed in which the inflowing fuel forms a spray with a large spray angle and short penetration (see paragraph 0071).
  • Patent Document 2 discloses that by inclining the lateral passage at an angle ⁇ with respect to the radial line (radial direction) of the valve seat, the lateral passage can be set to be long, and the fuel flow in the tangential direction of the swirl chamber can be made longer.
  • a technique is disclosed for accurately guiding fuel and obtaining a good swirl effect of fuel in a swirl chamber (see paragraphs 0063 and 0064).
  • FIG. 13A is a plan view showing a nozzle plate 21n equipped with swirl chambers 212-1 to 212-4 and fuel injection holes 220-1 to 220-4, which is a comparative example (first comparative example) with the present invention.
  • FIG. 13B is a diagram showing a cross-sectional shape of fuel spray according to a comparative example (first comparative example) with the present invention.
  • FIG. 13C is a conceptual diagram showing the arrangement of fuel sprays SPS1 to SPS4 injected from swirl passages 210-1 to 210-4 according to a comparative example (first comparative example) with the present invention.
  • FIG. 13D is a diagram showing the fuel distribution ratio of fuel sprays (total spray) injected from the swirl passages 210-1 to 210-4 according to a comparative example (first comparative example) with the present invention.
  • first comparative example comparative example
  • the four sets of swirl passages 210-1 to 210-4 shown in FIG. 13A are configured similarly to the fuel injection valve of Patent Document 1, and fuel injection is performed without sufficiently swirling the swirl chambers 212-1 to 212-4.
  • the fuel that flows into the holes 220-1 to 220-4 and the fuel that sufficiently swirls through the swirling chambers 212-1 to 212-4 and flows into the fuel injection holes 220-1 to 220-4 are injected.
  • the four fuel sprays SPS1 to SPS4 are arranged as shown in FIG. 13C in the spray cross section, and the entire fuel spray (total spray) SPH has a circular cross-sectional shape.
  • each fuel spray SPS1 to SPS4 injected from each fuel injection hole 220-1 to 220-4 is a flat shape having a long axis Ax1 and a short axis Ax2, as shown in FIG. 13B.
  • the cross-sectional shape of each of the fuel sprays SPS1 to SPS4 is approximately an ellipse having a long axis Ax1 and a short axis Ax2.
  • Fuel spray whose cross-sectional shape is deflected away from a circle, including an elliptical shape, is called a deflected spray.
  • the direction of deflection depends on the positional relationship between the lateral passages 211-1 to 211-4 and the swirling chambers 212-1 to 212-4 connected to the lateral passages 211-1 to 211-4.
  • the deflection direction corresponds to the arrangement (direction) of the long axis Ax1 and short axis Ax2 in the deflected spray, and changing the deflection direction changes the arrangement (orientation) of the long axis Ax1 and short axis Ax2 of the deflected spray. It corresponds to that.
  • Patent Document 1 no consideration is given to changing the arrangement (orientation) of the long axis Ax1 and short axis Ax2 of the deflected spray.
  • Patent Document 2 it is possible to set a long lateral passage, accurately guide the fuel in the tangential direction of the swirl chamber, and obtain a good swirl effect of the fuel in the swirl chamber.
  • Patent Document 2 there is no consideration for forming a deflected spray, and therefore there is no consideration for homogenizing the fuel distribution ratio within the cross section of the entire spray that is a combination of the deflected spray.
  • An object of the present invention is to provide a fuel injection valve that injects a whole spray by combining a plurality of deflected sprays, so that the shape of the whole spray can be changed and the fuel distribution rate within the cross section of the whole spray can be changed. It is to make it.
  • the fuel injection valve of the present invention includes: A valve seat and a valve body that cooperate to open and close a fuel passage; a plurality of swirling passages that are provided downstream of the valve seat and the valve body and that apply swirling force to fuel and inject it; a fuel introduction hole forming member in which a fuel introduction hole for introducing fuel into the swirling passage is formed opposite to the passage; the swirling passage is provided upstream of the fuel injection hole and the fuel injection hole; A fuel injection valve comprising: a swirling chamber for swirling fuel; and a lateral passage provided upstream of the swirling chamber and connected to the swirling chamber, The swirling passage is configured to inject deflected spray having a biased cross-sectional shape, On a projection view in which the horizontal passage and the fuel introduction hole are projected onto a virtual plane perpendicular to the central axis of the fuel injector, The lateral passage has an inclined passage part that is inclined with respect to a radial direction centered on the central axis of the fuel injector,
  • the fuel injection valve of the present invention includes: A valve seat and a valve body that cooperate to open and close a fuel passage; a plurality of swirling passages that are provided downstream of the valve seat and the valve body and that apply swirling force to fuel and inject it; a fuel introduction hole forming member in which a fuel introduction hole for introducing fuel into the swirling passage is formed opposite to the passage; the swirling passage is provided upstream of the fuel injection hole and the fuel injection hole; A fuel injection valve comprising: a swirling chamber for swirling fuel; and a lateral passage provided upstream of the swirling chamber and connected to the swirling chamber, The swirling passage is configured to inject deflected spray having a biased cross-sectional shape,
  • the lateral passage has an inclined passage part that is inclined with respect to a radial direction centered on the central axis of the fuel injector, The starting point of the inclined passage portion is located on the periphery of the fuel introduction hole or on the inner side of the fuel introduction hole than the perip
  • a fuel injection valve that injects a whole spray by combining a plurality of deflected sprays, it is possible to change the shape of the whole spray and change the fuel distribution ratio within the cross section of the whole spray.
  • FIG. 1 is a sectional view showing a cross section along a valve axis (center axis) 1a of a fuel injection valve 1 according to the present invention.
  • 2 is an enlarged cross-sectional view showing the vicinity of the valve portion 7 and fuel injection portion 21 (nozzle portion) of the fuel injection valve 1 in FIG. 1 (a cross-sectional view corresponding to the II-II arrow cross section in FIGS. 3A and 3B); FIG. .
  • FIG. 2 is a plan view of the nozzle plate 21n seen from the direction of the arrow III-III in FIG. 1;
  • FIG. 2 is a plan view of a modification of the nozzle plate 21n, viewed from the direction of the arrow III-III in FIG. 1;
  • FIG. 3 is an enlarged plan view of the swirling chamber 212 and the fuel injection hole 220 (an enlarged plan view of the IV section shown in FIGS. 3A and 3B). It is a top view of the turning passage 210 when the upper end surface of the nozzle plate 21n in which the turning passage 210 is formed is viewed from above.
  • 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 1 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 2 is a diagram illustrating an example of a lateral passage 211 according to the present invention, and is a plan view illustrating a starting point P2 of an inclined passage portion 2112 of the lateral passage 211.
  • FIG. 7 is a diagram illustrating an example of a starting point P2 of an inclined passage portion 2112.
  • FIG. 7 is a diagram showing another example of the starting point P2 of the inclined passage portion 2112.
  • FIG. 3 is a conceptual diagram showing the form of fuel spray injected from swirl passages 210-1 to 210-4.
  • FIG. 3 is a conceptual diagram showing a change in shape of a fuel spray cross section according to the change in shape.
  • the cross section of the fuel spray is determined according to the distance (injection distance) L from the fuel injection valve 1 in the fuel injection direction (in this example, the axial direction of the center axis 1a).
  • FIG. 7 is a diagram showing fuel distribution ratios of fuel sprays SPS1 to SPS4 injected from swirl passages 210-1 to 210-4 according to an embodiment of the present invention.
  • FIG. 7 is a diagram showing fuel distribution ratios of fuel sprays SPS1 to SPS4 injected from swirl passages 210-1 to 210-4 according to a comparative example (second comparative example) with the present invention.
  • 1 is a sectional view of an internal combustion engine equipped with a fuel injection valve 1.
  • FIG. FIG. 7 is a plan view showing a nozzle plate 21n provided with swirl passages 210-1 to 210-4 according to a comparative example (first comparative example) with the present invention. It is a figure which shows the cross-sectional shape of the fuel spray injected from one swirling passage 210 based on the comparative example (1st comparative example) with this invention.
  • FIG. 2 is a conceptual diagram showing the arrangement of fuel sprays SPS1 to SPS4 injected from swirling passages 210-1 to 210-4 according to a comparative example (first comparative example) with the present invention.
  • FIG. 7 is a diagram showing the distribution ratio of fuel for fuel sprays (total spray) injected from swirling passages 210-1 to 210-4 according to a comparative example (first comparative example) with the present invention.
  • FIG. 1 is a sectional view showing a cross section along a valve axis (center axis) 1a of a fuel injection valve 1 according to the present invention.
  • the central axis 1a of the fuel injection valve 1 coincides with the axis of the mover 27 (valve axis) in which a valve body 17, which will be described later, is integrally provided, and the central axis of the cylindrical body 5, which will be described later. matches.
  • the center axis 1a also coincides with the center lines of a valve seat 15b and a nozzle plate 21n, which will be described later.
  • the center axis, the shaft center (valve shaft center), and the center line will not be distinguished, and will be referred to as the center axis 1a.
  • the fuel injection valve 1 is provided with a cylindrical body 5 made of a metal material and extending from an upper end to a lower end.
  • a fuel flow path 3 is formed inside this cylindrical body 5 so as to substantially extend along the central axis 1a.
  • the upper end (upper end side) will be referred to as the proximal end (base end side), and the lower end (lower end side) will be referred to as the distal end (tip side).
  • the names of the base end (base end side) and the distal end (front end side) are based on the flow direction of the fuel or the mounting structure to the fuel pipe (not shown). That is, in the fuel flow direction, the base end is on the upstream side, and the distal end is on the downstream side. Further, the vertical relationship described in this specification is defined based on FIG. 1, and has no relation to the vertical direction in the state in which 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.
  • a fuel filter 13 is attached to this fuel supply port 2 .
  • the fuel filter 13 is a member for removing foreign matter mixed into the fuel.
  • An O-ring 11 is provided at the base end of the cylindrical body 5.
  • the O-ring 11 functions as a sealing material when the fuel injection valve 1 is connected to a fuel pipe.
  • a valve portion 7 consisting of 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 stepped valve body receiving hole 15a that accommodates the valve body 17.
  • a conical surface is formed in the middle of the valve body housing hole 15a, and a valve seat (sealing portion) 15b is formed on this conical surface.
  • a guide surface 15c that guides movement of the valve body 17 in the direction along the central axis 1a is formed in a portion of the valve body housing hole 15a on the upstream side (base end side) of the valve seat 15b.
  • the valve seat 15b and the valve body 17 cooperate to open and close the fuel passage.
  • the fuel passage is closed by the valve body 17 coming into contact with the valve seat 15b.
  • the fuel passage is opened by separating the valve body 17 from the valve seat 15b.
  • the valve seat member 15 is inserted inside the tip side of the cylindrical body 5 and is fixed to the cylindrical body 5 by laser welding. Laser welding 19 is performed over the entire circumference of the cylindrical body 5 from the outer peripheral side.
  • the valve body housing hole 15a passes through the valve seat member 15 in the direction along the central axis 1a.
  • a nozzle plate 21n is attached to the lower end surface (tip surface) of the valve seat member 15. The nozzle plate 21n is attached so as to close the opening of the valve seat member 15 formed by the valve body housing hole 15a.
  • valve seat member 15 and the nozzle plate 21n constitute a fuel injection section 21 that injects swirling fuel.
  • the nozzle plate 21n is fixed to the valve seat member 15 by laser welding.
  • the laser welding portion 23 surrounds the injection hole forming area in which the fuel injection holes 220-1, 220-2, 220-3, and 220-4 (see FIG. 3A) are formed, and is circling around.
  • the valve seat member 15 may be press-fitted inside the cylindrical body 5 on the front end side and then fixed to the cylindrical body 5 by laser welding.
  • the valve body 17 is a spherical ball valve.
  • a plurality of cutout surfaces 17a are provided at intervals in the circumferential direction at a portion of the valve body 17 that faces the guide surface 15c.
  • a gap is formed between the cutout surface 17a and the inner peripheral surface of the plate seat member 15. This gap constitutes a fuel passage.
  • a needle valve may be used.
  • valve portion 7 including the valve seat member 15 and the valve body 17 and the nozzle plate 21n constitute a nozzle portion for injecting fuel.
  • Fuel injection holes 220-1, 220-2, 220-3, 220-4 and a turning passage 210, which will be described in detail later, are provided on the end surface of the nozzle body (valve seat member 15) side where the valve part 7 is configured.
  • -1, 210-2, 210-3, and 210-4 are formed on the nozzle plate 21n.
  • the turning passages 210-1, 210-2, 210-3, 210-4 are the horizontal passages 211-1, 211-2, 211-3, 211-4 and the turning chambers 212-1, 212-2, 212. -3,212-4.
  • a drive unit 9 for driving the valve body 17 is arranged in the middle part of the cylindrical body 5.
  • the drive unit 9 is composed of an electromagnetic actuator.
  • the drive unit 9 includes a fixed core 25, a mover (movable member) 27, an electromagnetic coil 29, and a yoke 33.
  • the fixed iron core 25 is made of a magnetic metal material, and is press-fitted and fixed inside the longitudinally intermediate portion of the cylindrical body 5.
  • the fixed iron core 25 is formed in a cylindrical shape and has a through hole 25a passing through the center in a direction along the central axis 1a.
  • the fixed core 25 may be fixed to the cylindrical body 5 by welding, or may be fixed to the cylindrical body 5 using a combination of welding and press fitting.
  • the mover 27 is disposed inside the cylindrical body 5 closer to the tip than the fixed core 25.
  • a movable iron core 27a is provided on the base end side of the movable element 27.
  • the movable iron core 27a faces the fixed iron core 25 with a small gap ⁇ interposed therebetween.
  • a small diameter portion 27b is formed at the tip side of the movable element 27, and the valve body 17 is fixed to the tip of this small diameter portion 27b by welding.
  • the movable core 27a and the connecting portion 27b are integrally formed (one member made of the same material), but they may be constructed by joining two members.
  • the movable element 27 includes a valve body 17 at its tip, and displaces the valve body 17 in the opening/closing direction.
  • the movable element 27 is moved in the direction along the central axis 1a (opening/closing) by the valve body 17 contacting the guide surface 15c of the valve seat member 15 and the outer peripheral surface of the movable iron core 27a contacting the inner peripheral surface of the cylindrical body 5. (in the valve direction) is guided at two points in the valve axis direction.
  • a recess 27c is formed in the end surface of the movable core 27a facing the fixed core 25.
  • a spring seat 27e for 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 spring seat 27e, extending along the central axis 1a to the tip side end of the small diameter portion (connection portion) 27b. Further, an opening 27d is formed in the side surface of the small diameter portion 27b.
  • the through hole 27f opens at the bottom of the recess 27c, and the opening 27d opens at the outer peripheral surface of the small diameter section 27b, thereby creating a fuel passage 3 that communicates the fuel passage 3 formed in the fixed core 25 with the valve part 7. is configured.
  • the electromagnetic coil 29 is fitted onto the outer circumferential side of the cylindrical body 5 at a position where the fixed iron core 25 and the movable iron core 27a face each other with a small gap ⁇ therebetween.
  • the electromagnetic coil 29 is wound around a cylindrical bobbin 31 made of a resin material, and is fitted around the outer circumferential side of the cylindrical body 5 .
  • the electromagnetic coil 29 is electrically connected to a connector pin 43 provided on the connector 41 via a wiring member 45.
  • a drive circuit (not shown) is connected to the connector 41 , and a drive current is applied to the electromagnetic coil 29 via the connector pin 43 and the wiring member 45 .
  • the yoke 33 is made of a magnetic metal material.
  • the yoke 33 is disposed on the outer peripheral side of the electromagnetic coil 29 so as to cover the electromagnetic coil 29, and also serves as a housing for the fuel injection valve 1. Further, the lower end of the yoke 33 faces the outer circumferential surface of the movable core 27a via the cylindrical body 5, and together with the movable core 27a and the fixed core 25, the magnetic flux generated by energizing the electromagnetic coil 29 is Constructs a flowing closed magnetic path.
  • a coil spring 39 is disposed in a compressed state across the through hole 25a of the fixed core 25 and the recess 27c of the movable core 27a.
  • the coil spring 39 functions as a biasing member that biases the movable element 27 in a direction in which the valve body 17 contacts the valve seat 15b (valve closing direction).
  • An adjuster 35 is disposed inside the through hole 25a of the fixed iron core 25, and the proximal end of the coil spring 39 is in contact with the distal end surface of the adjuster 35.
  • the adjuster 35 has a fuel passage 3 passing through the center 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 of the through hole 25a of the fixed core 25, and then into the fuel flow path 3 configured within the movable element 27.
  • An O-ring 46 is fitted onto the tip of the cylindrical body 5.
  • the O-ring 46 provides a fluid-tight connection between the inner circumferential surface of the insertion port 109a (see FIG. 10) formed on the internal combustion engine side and the outer circumferential surface of the yoke 33. Functions as a seal to ensure airtightness.
  • a resin cover 47 is molded to cover the fuel injection valve 1 from the middle portion to the vicinity of the proximal end.
  • the distal end of the resin cover 47 covers a portion of the proximal end of the yoke 33 . Further, the resin cover 47 covers the wiring member 45, and the connector 41 is integrally formed with the resin cover 47.
  • a gap ⁇ exists between the distal end surface of the fixed core 25 and the proximal end surface of the movable core 27a. In this embodiment, this gap ⁇ is equal to the stroke of the movable element 27 (that is, the valve body 17).
  • the electromagnetic coil 29 When the electromagnetic coil 29 is de-energized, the magnetic attraction force decreases and eventually disappears. At the stage where the magnetic attraction force decreases, when the magnetic attraction force becomes smaller than the biasing force of the coil spring 39, the movable element 27 starts moving in the valve closing direction. When the valve body 17 comes into contact with the valve seat 15b, the valve body 17 closes the valve portion 7 and reaches a stationary state.
  • FIG. 2 is an enlarged cross-sectional view showing the vicinity of the valve part 7 and fuel injection part 21 (nozzle part) of the fuel injection valve 1 in FIG. Figure).
  • FIG. 3A is a plan view of the nozzle plate 21n seen from the direction of arrow III-III in FIG.
  • FIG. 3A is a plan view of the nozzle plate 21n viewed from the inlet side of the fuel injection hole, and is a plan view of the upper end surface 21nu side of the nozzle plate 21n.
  • a y0-x0 coordinate system is defined, which has a y0 axis and an x0 axis that are orthogonal to each other, and whose origin is the center 21no of the nozzle plate 21n.
  • the upper end surface 21nu is a surface facing the tip surface 15t of the valve seat member 15.
  • the end surface opposite to the upper end surface 21nu is referred to as a lower end surface 21nb.
  • the nozzle plate 21n is composed of a plate-like member whose both end surfaces are flat, and the upper end surface 21nu and the lower end surface 21nb are parallel. That is, the nozzle plate 21n is composed of a flat plate having a uniform thickness.
  • the fuel injection valve 1 is configured such that the central axis 1a intersects the nozzle plate 21n at the center 21no.
  • the tip surface (lower end surface) 15t of the valve seat member 15 is composed of a flat surface (flat surface) perpendicular to the central axis 1a.
  • a nozzle plate 21n is joined to a distal end surface 15t of the valve seat member 15, and the distal end surface 15t is in contact with an upper end surface 21nu of the nozzle plate 21n.
  • the nozzle plate 21n includes lateral passages 211-1, 211-2, 211-3, 211-4, swirl chambers 212-1, 212-2, 212-3, 212-4 and fuel injection holes 220-1, 220-2, 220-3, and 220-4 are formed.
  • the lateral passages 211-1, 211-2, 211-3, 211-4 and the swirling chambers 212-1, 212-2, 212-3, 212-4 are the fuel injection holes 220-1, 220-2,
  • Swirling passages 210-1, 210-2, 210-3, 210-4 are configured upstream of 220-3, 220-4 to apply a swirling force to the fuel.
  • the four sets of turning passages 210-1, 210-2, 210-3, 210-4 and the fuel injection holes 220-1, 220-2, 220-3, 220-4 are each configured similarly. Therefore, these may be described as the swirling passage 210, the lateral passage 211, the swirling chamber 212, and the fuel injection hole 220 without distinguishing them. If the configuration is changed for each group, it will be explained as appropriate.
  • the valve seat member 15 is formed with a conical valve seat surface 15b whose diameter decreases toward the downstream side.
  • a downstream end of the valve seat surface 15b is connected to a fuel introduction hole 300.
  • the downstream end of the fuel introduction hole 300 is open to the distal end surface 15t of the valve seat member 15.
  • the fuel introduction hole 300 constitutes a fuel passage that introduces fuel into the swirling passage 210. That is, the valve seat member 15 constitutes a fuel introduction hole forming member in which a fuel introduction hole 300 that faces the swirl passage 210 and introduces fuel into the swirl passage 210 is formed.
  • the swirling passage 210 is provided with the upstream end of the lateral passage 211 facing the opening surface of the fuel introduction hole 300.
  • the swirling passage 210 may be configured independently.
  • a lateral passage 211, a swirling chamber 212, and a fuel injection hole 220 are all formed in a nozzle plate 21n made of a single plate-like member.
  • the nozzle plate 21n can be composed of a plurality of plates, for example, by dividing it in the thickness direction.
  • the lateral passage 211 and the swirling chamber 212 are formed in one plate, and the fuel injection holes 220 are formed in another plate.
  • the nozzle plate 21n may be constructed by stacking these two plates.
  • the fuel injection holes 220 are formed parallel to the central axis 1a, but may be inclined at an angle greater than 0° with respect to the central axis 1a.
  • the fuel may be injected in a plurality of directions by differentiating the directions of inclination.
  • a fuel passage consisting of a total of four sets of swirl passages 210 and fuel injection holes 220 is configured in the nozzle plate 21n.
  • Each of the four sets of fuel passages is formed from the center 21no side of the nozzle plate 21n toward the outer circumferential side. That is, the lateral passage 211 is provided from the center 21no side of the nozzle plate 21n toward the outer peripheral side, and a curved passage portion is provided in the middle. Further, the respective fuel passages are formed at angular intervals of 90° in the circumferential direction.
  • the number of turning passages 210 and fuel injection holes 220 is not limited to four, but may be two or three, or five or more. Alternatively, only one set of the turning passage 210 and the fuel injection hole 220 may be provided.
  • FIG. 3B is a plan view of a modification of the nozzle plate 21n, viewed from the direction of arrow III-III in FIG. 1.
  • FIG. 3A the entire inner circumferential wall of the swirling chamber 212 is formed with the same radius in the circumferential direction.
  • FIG. 3B shows a modification example in which the radius of the inner circumferential wall of the swirling chamber 212 decreases from the upstream side to the downstream side.
  • the inner circumferential wall of the swirling chamber 212 is not limited to the configuration shown in FIG. 3A, but may be configured as shown in FIG. 3B.
  • FIG. 4 is an enlarged plan view showing the swirling chamber 212 and the fuel injection hole 220 (an enlarged plan view of the IV section shown in FIGS. 3A and 3B).
  • a y1-x1 coordinate system which has a y1 axis and an x1 axis that are orthogonal to each other, and whose origin is the center O2 of the inlet opening 220i of the fuel injection hole 220.
  • the origin of the y1-x1 coordinate system coincides with the center O1 of the swirling chamber 212.
  • the x1 axis coincides with the side wall 211i and its extension line 211il.
  • the lateral passage 211 is connected to the swirling chamber 212 so as to be offset from the center O1 of the swirling chamber 212.
  • One side wall 211o of the lateral passage 211 is connected to an inner peripheral wall portion (starting end, upstream end of the inner peripheral wall) 212cs located on the upstream side in the flow direction of the swirling fuel, and the other side wall 211i is located on the downstream side. It is connected to the inner circumferential wall (terminus, downstream end of the inner circumferential wall) 212ce. For this reason, an opening 212co is formed in the inner circumferential wall (side wall) 212c of the swirling chamber 212 at the connecting portion of the lateral passage 211.
  • the inner peripheral wall 212c of the swirling chamber 212 is formed to form an arc-shaped peripheral wall around the inlet opening 220i of the fuel injection hole 220 so as to swirl the fuel that has flowed into the swirling chamber 212 from the lateral passage 211. .
  • a fuel swirling flow path (swirling passage) 212d is formed between the inner circumferential wall 212c of the swirling chamber 212 and the inlet opening 220i of the fuel injection hole 220.
  • the side walls (side surfaces) 211o, 211i and the bottom surface 211b of the lateral passage 211 are constituted by a nozzle plate 21n. Further, the upper surface (ceiling surface) 211u (see FIG. 2) of the lateral passage 211 is constituted by the lower end surface 15t of the valve seat member 15.
  • the side wall 211o of the lateral passage 211 is connected to the swirling chamber 212 at an angle in contact with the inner circumferential wall 212c of the swirling chamber 212.
  • the downstream end of the side wall 211o is connected to the starting end 212cs of the inner peripheral wall 212c of the swirling chamber 212.
  • the side wall 211i of the lateral passage 211 is connected to the swirling chamber 212 at an angle that intersects with the inner circumferential wall 212c of the swirling chamber 212 or an extension thereof.
  • intersecting means that the side wall 211i and its extension line cross the inner peripheral wall 212c or its extension line.
  • the downstream end of the side wall 211i is connected to the terminal end 212ce of the inner peripheral wall 212c of the swirling chamber 212.
  • the extension line of the inner peripheral wall 212c corresponds to the chain double-dashed line representing the opening 212co of the swirling chamber 212.
  • the starting end 212cs of the inner circumferential wall 212c of the swirling chamber 212 is an end located on the upstream side in the swirling direction of the fuel.
  • a terminal end 212ce of the inner peripheral wall 212c is an end located on the downstream side in the swirling direction of the fuel.
  • a chamfered portion such as an inclined portion or a rounded portion may be formed on the terminal end portion 212ce. In such a case, the intersection of two imaginary lines (extension lines) extending the inner circumferential wall 212c and the side wall 211i to the terminal end 212ce may be determined as the terminal end (downstream end) 212ce.
  • the inner circumferential wall 212c between the starting end 212cs and the terminal end 212ce of the swirling chamber 212 is formed in an arc shape with a constant radius R centered on O1. That is, the inner circumferential wall 212c is constituted by a perfect circle or a part of the circumference of a perfect circle.
  • the inlet opening 220i of the fuel injection hole 220 has a circular shape having a radius r smaller than the radius R of the inner circumferential wall 212c of the swirling chamber 212.
  • a bottom surface 212b of the swirl flow path 212d is formed between the inlet opening edge 220ic of the fuel injection hole 220 and the inner circumferential wall 212c of the swirl chamber 212.
  • the central axis 220a (see FIG. 2) of the fuel injection hole 220 is inclined with respect to the bottom surface 212b, the inlet opening 220i will not be circular even if the cross section of the fuel injection hole 220 is circular. , exhibiting an oval shape.
  • the central axis 220a (see FIG. 2) of the fuel injection hole 220 passes through the center O2 of the inlet opening 220i, regardless of the presence or absence of an inclination.
  • FIG. 4 is a plan view in which the fuel injection hole 220, the swirl chamber 212, and the lateral passage 211 are projected onto a virtual plane (projection plane) perpendicular to the central axis 1a of the fuel injection valve 1.
  • a virtual plane perpendicular to the central axis 1a of the fuel injection valve 1.
  • an extension line (first extension line) 211ol of the side wall 211o of the lateral passage 211 and an extension line (second extension line) 211il of the side wall 211i are further projected onto a virtual plane (projection plane). It is shown.
  • the first extension line 211ol is an imaginary line extending along the side wall 211o.
  • the second extension line 211il is an imaginary line extending along the side wall 211i.
  • the second extension line 211il divides the bottom surface of the swirling chamber 212 (the bottom surface 212b of the swirling flow path 212d) into two regions A1 and A2.
  • the region A1 is a region located on the side wall 211o or its extension line 211ol side with respect to the second extension line 211il.
  • the starting end 212cs of the inner peripheral wall 212c is located in the area A1.
  • the region A2 is a region located on the side opposite to the side wall 211o or its extension line 211ol with respect to the second extension line 211il.
  • Region A2 is constituted by the swirling flow path portion on the terminal end 212ce side of the inner peripheral wall 212c. Note that the areas A1 and A2 do not include the area on the second extension line 211il.
  • the fuel injection hole 220 is arranged so that a part of the inlet opening edge 220ic extends beyond the second extension line 211il and protrudes toward the area A1 side. That is, a portion of the inlet opening 220i of the fuel injection hole 220 opens toward the area A1 and is located on an extension of the lateral passage 211.
  • the area of the bottom surface 212b of the swirling chamber 212 located between the second extension line 211il and the side wall 211o or its extension line 211ol is considered as the bottom surface 211b of the lateral passage 211
  • one of the inlet openings 220i of the fuel injection holes 220 is located on the bottom surface 211b of the lateral passage 211.
  • the cross-sectional shape of the fuel spray injected from the fuel injection hole 220 changes from a circular shape to a flat shape.
  • the cross-sectional shape of the fuel spray is an ellipse having a major axis and a minor axis.
  • the cross-section and cross-sectional shape of the fuel spray refer to the cross-section and cross-sectional shape perpendicular to the injection direction, and may also be referred to as the vertical cross-section and vertical cross-sectional shape when specifically expressed.
  • the fuel spray (entire spray) injected from the plurality of fuel injection holes 220 will be described as being injected in a direction along the central axis 1a of the fuel injection valve 1.
  • the center O2 of the inlet opening 220i of the fuel injection hole 220 is located on the second extension line 211il. Therefore, the inlet opening 220i of the fuel injection hole 220 extends beyond the second extension line 211il by the radius r of the fuel injection hole 220 toward the region A1 side. Therefore, the inlet opening edge 220ic of the fuel injection hole 220 intersects with the second extension line 211il at two points 220ia and 220ib. That is, the inlet opening 220i of the fuel injection hole 220 is arranged such that the second extension line 211il and the inlet opening edge 220ic intersect at two points 220ia and 220ib.
  • the amount of protrusion of the inlet opening 220i toward the area A1 is not limited to the size corresponding to the radius r of the fuel injection hole 220. This amount of protrusion may be larger or smaller than the radius r. By changing the amount of protrusion, the shape and size of the spray cross section (spray distribution) can be changed.
  • the center O2 of the inlet opening 220i of the fuel injection hole 220 may be arranged at a position shifted from the center O1 of the swirling chamber 212 in the direction along the second extension line 211il. That is, the center O2 of the inlet opening 220i of the fuel injection hole 220 may be eccentric with respect to the center O1 of the swirling chamber 212.
  • the shape and size of the spray cross section can be changed.
  • the side wall 211o and the side wall 211i of the lateral passage 211 are formed in parallel, and the width of the lateral passage 211 is constant. Shifting the center O2 of the inlet opening 220i of the fuel injection hole 220 from the center O1 of the swirling chamber 212 in the direction along the second extension line 211il means shifting it in the direction along the center line L3 of the lateral passage 211.
  • the inner peripheral wall 212c of the swirling chamber 212 is not limited to having a constant radius R.
  • the inner circumferential wall 212c of the swirling chamber 212 may have a shape such that R becomes smaller from the upstream side to the downstream side in the swirling direction of the fuel.
  • the upstream portion of the inner circumferential wall 212c of the swirling chamber 212 has a shape as shown by a broken line 212c', and is formed by an arc having a larger radius than the downstream portion.
  • the inner circumferential wall 212c of the swirling chamber 212 is composed of an arcuate portion with a radius R (the portion above the second extension line 211il) and an arcuate portion with a radius larger than R (the portion indicated by the broken line 212c'). , the radius becomes smaller from the upstream side to the downstream side in the fuel swirl direction.
  • the side wall 211o of the lateral passage 211 is arranged as shown by a broken line 211o', and is connected to the inner circumferential wall 212c' at a point 212cs'.
  • the radius decreases in two steps from the upstream side to the downstream side in the fuel swirl direction, but the radius of the inner peripheral wall 212c is continuous from the upstream side to the downstream side.
  • it may have a spiral shape that gradually becomes smaller.
  • FIG. 5 is a plan view of the turning passage 210 when the upper end surface of the nozzle plate 21n in which the turning passage 210 is formed is viewed from above.
  • the four sets of turning passages 210-1 to 210-4 described above are formed in the same way, so as described above, the four sets of turning passages 210-1 to 210-4 are It will be described as a turning passage 210 without distinction.
  • a curved passage portion 2113 is provided in the lateral passage 211 in the middle of extending from the center 21no side of the nozzle plate 21n to the outer peripheral side.
  • the lateral passage 211 includes a straight portion 2111 formed on the center 21no side of the nozzle plate 21n (inner peripheral straight portion), a straight portion 2112 formed on the outer peripheral side (outer peripheral straight portion), and a straight portion 2112 formed on the outer peripheral side. It includes a curved passage portion 2113 formed between the straight portion 2111 and the outer peripheral side straight portion 2112.
  • the inner circumferential passage portion 2111 is arranged on the inner circumferential side (center side) of the nozzle plate 21n and extends radially outward. As shown in FIGS. 3A and 3B, the inner circumferential passage portion 2111 is connected to the lateral passage 211 of the other turning passage 210 on the center 21no side of the nozzle plate 21n.
  • the outer circumference side passage part 2112 is arranged so that the connection part with the swirling chamber 212 is located on the radially inner side compared to the case where the inner circumference side passage part 2111 is extended radially outward as it is. It extends in a direction inclined with respect to 2111.
  • the outer circumferential passage The portion 2112 extends in a direction oblique to the radial direction centered on the center 21no (center axis 1a) of the nozzle plate 21n.
  • the swirling chamber 212 is arranged so as to protrude radially outward with respect to the outer circumferential passage portion 2112. That is, the center O2 of the inlet opening 220i of the fuel injection hole 220 is located on the outside in the radial direction with respect to the center line L3 of the lateral passage 211. Moreover, the center O1 of the swirling chamber 212 is located on the outside in the radial direction with respect to the center line L3 of the lateral passage 211.
  • the curved passage portion 2113 changes the extending direction of the outer circumferential straight portion 2112 to a direction inclined from the extending direction of the inner circumferential straight portion 2111.
  • the curved passage portion 2113 is such that the extending direction of the outer circumferential straight portion 2112 (direction of the center line 211Ax2) is inclined by an angle ⁇ 211 with respect to the extending direction of the inner circumferential straight portion 2111 (direction of the center line 211Ax1). change in direction.
  • the curved passage portion 2113 may be formed such that the outer straight portion 2112 is bent from the inner straight portion 2111, or may be formed such that the outer straight portion 2112 gently changes direction from the inner straight portion 2111. may be formed.
  • a curved center line 211Ax3 may be provided near the intersection 211x where the center line 211Ax1 and the center line 211Ax2 intersect.
  • FIG. 4 the portion of the swirl passage 210 from the outer circumferential straight portion 2112 to the swirl chamber 212 and fuel injection hole 220 side is depicted, and the center line 211Ax2 in FIG. 5 is the center line of the lateral passage 211 in FIG. Corresponds to L3.
  • the outer circumferential passage portion 2112 constitutes an inclined passage portion that is inclined with respect to the radial direction (radial direction) RD centered on the central axis 1a of the fuel injection valve 1, and may take various forms. I can do it.
  • 6A to 6I illustrate an example in which four turning passages 210 of the same shape are formed in the nozzle plate 21n.
  • FIG. 6A is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • the swirl passage 210 of this embodiment is configured to inject deflected spray having a biased cross-sectional shape.
  • the lateral passage 211 is a fuel injection hole. It has an inclined passage portion 2112 that is inclined with respect to the radial direction (radial direction) RD centered on the central axis 1a of the valve 1.
  • the inclined passage section 2112 is the aforementioned outer peripheral side passage section.
  • the central axis 1a of the fuel injection valve 1 passes through the center 21no of the nozzle plate 21n and coincides with the center 21no of the nozzle plate 21n on the above-mentioned virtual plane.
  • the extending direction (direction of the center line 211Ax1) of the inner circumferential passage portion 2111 is the radial direction (radial direction) RD
  • the inner circumferential passage portion 2111 is constituted by the radial passage portion.
  • the starting point P2 of the inclined passage section 2112 that is inclined with respect to the radial direction (radial direction) RD is the center line 211Ax2 of the outer straight section 2112 and the center line 211Ax1 of the inner passage section 2111, that is, the radial direction (radial direction). direction) coincides with the intersection with RD, and is on the line of the radial direction RD (on the radial direction line).
  • the curved passage section 2113 is located inside the fuel introduction hole 300 from the circumference 300a of the fuel introduction hole 300, and the inclined passage section 2112 extends linearly from the circumference 300a of the fuel introduction hole 300.
  • An intersection point P1 between the center line 211Ax2 of the inclined passage portion 2112 and the peripheral edge 300a of the fuel introduction hole 300 is located on the passage of the lateral passage 211.
  • the starting point P2 of the inclined passage portion 2112 is located on the periphery 300a of the fuel introduction hole 300 or inside the fuel introduction hole 300 from the periphery 300a of the fuel introduction hole 300 in the radial direction (radial direction) RD.
  • the radial direction RD passing through the starting point P2 of the inclined passage section 2112 intersects with the side wall 211i of the lateral passage 211 located on the opposite side of the central axis 1a of the fuel injection valve 1 with respect to the center line 211Ax2 of the inclined passage section 2112. .
  • the swirling chamber 212 is formed so as to protrude toward the outside of the lateral passage 211 from the side wall 211i of the lateral passage 211 where the radial direction RD passing through the starting point P2 of the inclined passage portion 2112 intersects.
  • an inner peripheral wall end 212cs (see FIG. 4) of the swirling chamber 212 located on the upstream side in the flow direction of the swirling fuel flowing through the swirling chamber 212 has a fuel
  • the inner circumferential wall end 212ce of the swirling chamber 212 is connected to the downstream end of the side wall 211o of the lateral passage 211, which is located on the side of the central axis 1a of the injection valve 1, and is located downstream in the flow direction of the swirling fuel. 4) is connected to the downstream end of the side wall 211i of the lateral passage 211 located on the opposite side of the central axis 1a of the fuel injection valve 1 with respect to the center line 211Ax2 of the inclined passage part 2112. It is composed of.
  • the inner peripheral wall end 212cs (see FIG. 4) of the swirling chamber 212 is connected to the downstream end of one side wall of the inclined passage section 2112, and the inner peripheral wall end 212cs (see FIG. 4) of the swirling chamber 212 is connected to the downstream end of one side wall of the inclined passage section 2112. is connected to the downstream end of the other side wall of the inclined passage section 2112.
  • the inclined passage section 2112 is preferably formed as a passage section whose center line 211Ax2 is linear. Alternatively, the inclined passage section 2112 may be formed as a passage section whose center line 211Ax2 forms a curve.
  • FIG. 6B is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • This example differs from FIG. 6A in that at least a portion of the curved passage portion 2113 is located outside the fuel introduction hole 300 from the periphery 300a of the fuel introduction hole 300.
  • the other configurations, including the configurations of P1 and P2, are the same as in FIG. 6A.
  • FIG. 6C is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • This example differs from FIG. 6A in that there is no inner circumferential passage portion (radial passage portion) 2111 and curved passage portion 2113, and the lateral passage 211 is constituted by an inclined passage portion 2112. That is, the lateral passage 211 is composed of only the inclined passage part 2112.
  • the inclined passage portion 2112 extends linearly from the peripheral edge 300a of the fuel introduction hole 300.
  • the other configurations, including the configurations of P1 and P2, are the same as in FIG. 6A.
  • the starting point P2 of the inclined passage section 2112 is located at the center line 211Ax2 of the inclined passage section 211 on a projection view (FIG. 6C) in which the horizontal passage 211 and the fuel introduction hole 300 are projected onto a virtual plane perpendicular to the central axis 1a.
  • the intersections between the normal line L4 of the side walls 211i and 211o forming the inclined passage portion 2112 it can be defined as the intersection closest to the central axis 1a of the fuel injection valve 1.
  • FIG. 6D is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • This example differs from FIG. 6C in that at least a part of the end of the inclined passage section 2112 on the side of the starting point P2 is located outside the fuel introduction hole 300 with respect to the peripheral edge 300a of the fuel introduction hole 300.
  • the other configurations, including the configurations of P1 and P2, are the same as in FIG. 6C.
  • FIG. 6E is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • the end of the lateral passage 211-1 of the turning passage 210-1 on the opposite side to the turning chamber 212-1 is the intermediate part of the lateral passage 211-4 of the turning passage 210-4. It is connected to the.
  • the end of the lateral passage 211-2 of the turning passage 210-2 on the side opposite to the turning chamber 212-2 is connected to the intermediate part of the lateral passage 211-1 of the turning passage 210-1.
  • the end of the lateral passage 211-3 of the turning passage 210-3 on the side opposite to the turning chamber 212-3 is connected to the intermediate part of the lateral passage 211-2 of the turning passage 210-2.
  • the end of the lateral passage 211-4 of the turning passage 210-4 on the side opposite to the turning chamber 212-4 is connected to the intermediate part of the lateral passage 211-3 of the turning passage 210-3.
  • the starting point P2 of the inclined passage part 2112 is the center of the inclined passage part 211 on the projection view (FIG. 6C) in which the horizontal passage 211 and the fuel introduction hole 300 are projected onto a virtual plane perpendicular to the central axis 1a.
  • the intersections of the line 211Ax2 and the normal L4 of the side walls 211i, 211o forming the inclined passage portion 2112 it is defined as the intersection closest to the central axis 1a of the fuel injection valve 1.
  • the radial direction RD is defined as a direction passing through the center of the nozzle plate 21n (center axis 1a) and the starting point P2 of the inclined passage section 2112.
  • the radial direction RD in this example intersects both the side wall 211o and the side wall 211i of the inclined passage section 2112.
  • FIG. 6F is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • the side wall 211i of the inclined passage part 2112 is located on the outer side of the fuel introduction hole 300 than the peripheral edge 300a of the fuel introduction hole 300. are different.
  • the other configurations, including the configurations of P1 and P2, are similar to FIG. 6E.
  • FIG. 6G is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • This example differs from FIG. 6D in that the inclined passage portion 2112 has a bent portion 2112a.
  • the other configurations, including the configurations of P1 and P2, are the same as in FIG. 6D.
  • FIG. 6H is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • This example differs from FIG. 6D in that the center line 211Ax of the inclined passage section 2112 has a curved shape.
  • the center line 211Ax draws a curved line that is convex toward the center of the nozzle plate 21n (towards the central axis 1a).
  • the other configurations, including the configurations of P1 and P2, are the same as in FIG. 6D.
  • FIG. 6I is a diagram showing an example of the lateral passage 211 according to the present invention, and is a plan view showing the starting point P2 of the inclined passage part 2112 of the lateral passage 211.
  • the center line 211Ax of the inclined passage portion 2112 is configured to draw a curve convex toward the center side (center axis 1a side) and the opposite side (outer circumferential side) of the nozzle plate 21n. different.
  • the other configurations, including the configurations of P1 and P2, are similar to FIG. 6H.
  • the starting point P2 of the inclined passage portion 2112 will be described with reference to FIGS. 7A and 7B.
  • the starting point P2 of the inclined passage section 2112 can be defined as follows in addition to the above definition.
  • FIG. 7A is a diagram showing an example of the starting point P2 of the inclined passage section 2112. This example is the same as the definitions in FIGS. 6C to 6I.
  • the starting point P2 of the inclined passage section 2112 is a base point located on the upstream side among the base points of both ends of the inclined passage section 2112.
  • the starting point P2 of the inclined passage section 2112 is inclined to the center line 211Ax2 of the inclined passage section 211 on a projection view (FIG. 7A) in which the horizontal passage 211 and the fuel introduction hole 300 are projected onto a virtual plane perpendicular to the central axis 1a. It can be defined as the intersection closest to the central axis 1a of the fuel injection valve 1 among the intersections with the normal L4 of the side walls 211i and 211o forming the passage portion 2112.
  • FIG. 7B is a diagram showing another example of the starting point P2 of the inclined passage section 2112.
  • the starting point P2 of the inclined passage section 2112 has the passage width of the inclined passage section 2112 as its diameter, and the most fuel among the orbits (trajectories) drawn by the center of the circle C1 touching the side wall 211i of the inclined passage section 2112. It can be defined as a point close to the central axis 1a of the injection valve 1 (near point). In this case, the trajectory (trajectory) drawn by the center of the circle C1 coincides with the center line 211Ax2 of the inclined passage section 211. Further, the circle C1 illustrated in FIG. 7B is a circle centered on the starting point P2.
  • FIG. 8 is a conceptual diagram showing the form of fuel spray injected from the swirling passages 210-1 to 210-4.
  • FIG. 8 shows a cross section of the fuel spray perpendicular to the injection direction of the entire spray SPH (in this embodiment, the axial direction of the central axis 1a of the fuel injection valve 1).
  • Fuel spray SPS1 is injected from swirling passage 210-1
  • fuel spray SPS2 is injected from swirling passage 210-2
  • fuel spray SPS3 is injected from swirling passage 210-3
  • fuel spray SPS4 is injected from swirling passage 210-2. Injected from -4.
  • the cross-sectional shape of the fuel sprays SPS1 to SPS4 injected from each of the turning passages 210-1 to 210-4 is a flat shape having a long axis Ax1 and a short axis Ax2, and is generally , has an elliptical shape having a long axis Ax1 and a short axis Ax2.
  • Fuel spray whose cross-sectional shape is biased away from a circular shape, including an elliptical shape is called a deflected spray.
  • the deflected spray is a spray whose cross-sectional shape is deviated from a circular shape.
  • deflection sprays other than elliptical shapes may also be included.
  • a fuel spray having an elliptical spray cross section will be described as a deflected spray.
  • the elliptical fuel spray has a long shape due to the positional relationship between the lateral passages 211-1 to 211-4 and the swirling chambers 212-1 to 212-4 connected to the lateral passages 211-1 to 211-4.
  • the directions of the axis Ax1 and the short axis Ax2 are determined. That is, in this embodiment, the positional relationship between the lateral passages 211-1 to 211-4 and the swirling chambers 212-1 to 212-4 connected to the lateral passages 211-1 to 211-4 is such that the deflected spray Determine the direction of deflection.
  • each fuel spray SPS1 to SPS4 has one end of the long axis Ax1 of the entire spray SPH. It is arranged so that it is located at the center and the other end is located at the outer circumferential side of the overall spray SPH.
  • the cross-sectional shape of the entire spray SPH is approximately circular, as shown in FIG. 13C.
  • the lateral passages 211-1 to 211-4 extend linearly (radially) from the center 21no of the nozzle plate 21n toward the outer circumference, as shown in FIG. 13A.
  • a curved passage portion 2113 is not provided between the center 21no and the turning chambers 212-1 to 212-4.
  • the overall spray SPH has a cross-sectional shape and a fuel spray distribution ratio as shown in FIG. 13D.
  • FIG. 13D shows the distribution ratio of fuel spray in a spray cross section, and this spray cross section is represented by a plane whose vertical and horizontal axes are the directions (angles) in which fuel spray particles fly.
  • the long axis Ax1 and short axis Ax2 of the four fuel sprays SPS1 to SPS4 are arranged as shown in FIG. 13C, and the four fuel sprays SPS1 to SPS4 overlap, so that the cross-sectional shape of the total spray SPH is almost circular become.
  • the four fuel sprays SPS1 to SPS4 overlap, so the distribution ratio of the fuel spray is particularly high at the center of the fuel spray cross section, and the distribution ratio (peak A fuel spray (total spray) SPH with a high distribution ratio) is formed. Therefore, the concentration of fuel spray tends to increase at the center of the fuel spray cross section.
  • the orientation of the swirling passageway 210 is as indicated by the arrow AW in FIG. That is, the arrow AW is assumed to be perpendicular to the center line 211Ax2 and to point in a direction from the center of the fuel injection hole 220 to the side opposite to the center line 211Ax2.
  • the direction AW of each turning passage 210-1 to 210-4 on the nozzle plate 21n in FIGS. 3A and 3B is the same as the direction AW of each turning passage 210-1 to 210-4 on the nozzle plate 21n in FIG. 13A. different. That is, the inclination that the arrow AW of each turning passage 210-1 to 210-4 makes with respect to the radial direction in FIGS. 3A and 3B is the same as that of the arrow AW of each turning passage 210-1 to 210-4 in FIG. It is different from the inclination made with respect to the radial direction.
  • the fuel sprays SPS1 to SPS4 are along the circumferential direction (outer edge direction) of the entire spray SPH whose long axis Ax1 is circular, and along the entire spray SPH whose short axis Ax2 is circular. are arranged along the radial direction.
  • the turning passages 210-1 to 210-4 are formed in the same shape and arranged at equal intervals in the circumferential direction, so that the two fuel sprays SPS1 and SPS3 are are arranged symmetrically with respect to the center a0 of the entire spray SPH, and two fuel sprays SPS2 and SPS4 are arranged symmetrically with respect to the center a0. Further, the two fuel sprays SPS1, SPS2 and the two fuel sprays SPS4, SPS3 are arranged symmetrically with respect to a line segment passing through the center a0, the point a8, and the point a6.
  • the two fuel sprays SPS1 and SPS4 and the two fuel sprays SPS2 and SPS3 are arranged symmetrically with respect to a line segment passing through the center a0, the point a5, and the point a7.
  • the points a5 to a8 are the intersection points where the long axes Ax1 of the fuel sprays SPS1 to SPS4 intersect, as will be described later.
  • Each of the fuel sprays SPS1 to SPS4 intersects the long axis Ax1 of the adjacent fuel spray at both ends of the long axis Ax1.
  • "one" and “the other” used with respect to both ends of the long axis Ax1 do not always mean the ends on the same side, and are interchanged in the description from time to time.
  • the fuel spray SPS1 crosses one end of the long axis Ax1 of the fuel spray SPS2 at one end of the long axis Ax1, and the fuel spray SPS4 crosses the other end of the long axis Ax1 of the fuel spray SPS1. It intersects with one end side of the long axis Ax1.
  • Long axis Ax1 of fuel spray SPS1 and long axis Ax1 of fuel spray SPS2 intersect at intersection a5
  • long axis Ax1 of fuel spray SPS1 and long axis Ax1 of fuel spray SPS4 intersect at intersection a8, and intersect with intersection a5.
  • a8 is located on the outer edge side of the fuel spray SPS1 with the center (the intersection of the long axis Ax1 and the short axis Ax2) a1 of the fuel spray SPS1 in the axial direction of the long axis Ax1.
  • the fuel spray SPS2 crosses one end of the long axis Ax1 of the fuel spray SPS3 at one end of the long axis Ax1, and crosses the length of the fuel spray SPS1 at the other end of the long axis Ax1 of the fuel spray SPS2. It intersects with one end side of the axis Ax1.
  • Long axis Ax1 of fuel spray SPS2 and long axis Ax1 of fuel spray SPS3 intersect at intersection a6, long axis Ax1 of fuel spray SPS2 and long axis Ax1 of fuel spray SPS1 intersect at intersection a5, and intersect with intersection a6.
  • a5 is located on the outer edge side of the fuel spray SPS2 across the center a2 (the intersection of the long axis Ax1 and the short axis Ax2) of the fuel spray SPS2 in the axial direction of the long axis Ax1.
  • the fuel spray SPS3 crosses one end of the long axis Ax1 of the fuel spray SPS4 at one end of the long axis Ax1, and the length of the fuel spray SPS2 intersects with the other end of the long axis Ax1 of the fuel spray SPS3. It intersects with one end side of the axis Ax1.
  • the long axis Ax1 of fuel spray SPS3 and the long axis Ax1 of fuel spray SPS4 intersect at intersection a7
  • the long axis Ax1 of fuel spray SPS3 and the long axis Ax1 of fuel spray SPS2 intersect at intersection a6, and intersect with intersection a7.
  • a6 is located on the outer edge side of the fuel spray SPS3 across the center a3 (the intersection of the long axis Ax1 and the short axis Ax2) of the fuel spray SPS3 in the axial direction of the long axis Ax1.
  • the fuel spray SPS4 crosses one end of the long axis Ax1 of the fuel spray SPS1 at one end of the long axis Ax1, and crosses the length of the fuel spray SPS3 at the other end of the long axis Ax1 of the fuel spray SPS4. It intersects with one end side of the axis Ax1.
  • the long axis Ax1 of fuel spray SPS4 and the long axis Ax1 of fuel spray SPS1 intersect at intersection a8, the long axis Ax1 of fuel spray SPS4 and the long axis Ax1 of fuel spray SPS3 intersect at intersection a7, and intersect with intersection a8.
  • a7 is located on the outer edge side of the fuel spray SPS4 across the center a4 (the intersection of the long axis Ax1 and the short axis Ax2) of the fuel spray SPS4 in the axial direction of the long axis Ax1.
  • the intersection a5 is located closer to the outer edge of the fuel spray SPS1 than the center a1 of the fuel spray SPS1 in the axial direction of the long axis Ax1
  • the intersection a8 is located closer to the outer edge of the fuel spray SPS1 in the axial direction of the long axis Ax1. It is located closer to the outer edge of the fuel spray SPS1 than the center a1 of the fuel spray SPS1 in the direction.
  • intersections a5 and a8 are located closer to the outer edge of the fuel spray SPS1 than the intermediate points a9 and a10 between the center a1 of the fuel spray SPS1 and the outer edge of the fuel spray SPS1 in the axial direction of the long axis Ax1.
  • the intersections a6 and a5 configured for the fuel spray SPS2, the intersections a7 and a6 configured for the fuel spray SPS3, and the intersections a8 and a7 configured for the fuel spray SPS4 are also the intersections a5 and a8 configured for the fuel spray SPS1. placed in a similar position.
  • the distance D2 between the intersection a5 configured on the long axis Ax1 of the fuel spray SPS1 and the outer edge of the entire spray SPH, and the distance D2 between the intersection a8 configured on the long axis Ax1 of the fuel spray SPS1 and the outer edge of the entire spray SPH The distance D3 is shorter than the distance D1 between the center a1 of the fuel spray SPS1 and the outer edge of the entire spray SPH.
  • the fuel sprays SPS2 to SPS4 also have the same configuration as the fuel spray SPS1.
  • the outer edge of the entire spray SPH is an envelope that touches the fuel sprays SPS1 to SPS4, and may differ from the contour that faithfully follows the outer edges of each of the fuel sprays SPS1 to SPS4.
  • intersection between the outer edge of the fuel spray SPS2 and the long axis Ax1 of the fuel spray SPS2 intersects with the intersection between the outer edge of the fuel spray SPS2 and the long axis Ax1 of the fuel spray SPS2. Therefore, when the long axes Ax1 of the two fuel sprays SPS1 and SPS2 begin to intersect with each other, the intersection point a5 is located on the outer edge of the fuel sprays SPS1 and SPS2.
  • FIG. 9A shows the distance (injection FIG. 3 is a conceptual diagram showing a change in shape of a cross section of fuel spray depending on distance) L.
  • FIG. 9A shows the distance (injection FIG. 3 is a conceptual diagram showing a change in shape of a cross section of fuel spray depending on distance) L.
  • each of the fuel sprays SPS1 to SPS4 intersects the long axis Ax1 of the adjacent fuel spray at both ends of the long axis Ax1.
  • the intersection a8 of the long axes Ax1 of the two adjacent fuel sprays SPS1 and SPS4 is the outer edge of the fuel spray SPS1 in the axial direction of the long axis Ax1 of the fuel spray SPS1. It is located closer to the center a1 of the fuel spray SPS1 than the outer edge of the fuel spray SPS4 in the axial direction of the long axis Ax1 of the fuel spray SPS4.
  • the four fuel sprays SPS1 to SPS4 overlap at the center a0 of the entire spray SPH.
  • the fuel distribution rate becomes small within a wide spray cross section where the fuel spray is sufficiently diffused, and the fuel sprays SPS1 to SPS4 overlap with each other in a state where the fuel distribution rate is low. It is possible to suppress the occurrence of a peak with a high fuel distribution ratio as shown in the figure.
  • FIG. 9C shows fuel sprays SPS1 and SPS4 that are injected in directions away from each other, depending on the distance (injection distance) L from the fuel injection valve 1 in the fuel injection direction (in this example, the axial direction of the central axis 1a).
  • FIG. 3 is a conceptual diagram showing changes in the shape of a fuel spray cross section.
  • the two fuel sprays SPS1 and SPS4 are injected from fuel injection holes 220-1 and 220-4 that are formed to be inclined with respect to the central axis 1a of the fuel injection valve 1 and to be spaced apart from each other as L increases.
  • the injection directions of the two fuel sprays SPS1 and SPS4 are inclined so that they become farther apart toward the downstream side.
  • the centers a1 and a4 of the fuel spray SPS1 and the fuel spray SPS4 become further apart from each other as they move away from the fuel injection valve 1 toward the downstream side. Therefore, the intersection a8 of the axis Ax1 of the fuel spray SPS1 and the axis Ax1 of the fuel spray SPS4 moves less on the long axis Ax1 than in the case of FIG. 9A, and the center a1 of the fuel spray SPS1 and the fuel It becomes difficult to approach the center a4 of the spray SPS4.
  • a space where fuel sprays SPS1 to SPS4 do not exist is likely to be formed in a region including the center a0 of the entire spray SPH. That is, in the case of FIG. 9C, a space where fuel sprays SPS1 to SPS4 do not exist is formed in a section with a long distance L in the injection direction compared to the case of FIG. 9A.
  • the features (1) to (4) of this embodiment described above may not be realized depending on the distance L. However, there is a distance L at which the features (1) to (4) of this embodiment are realized.
  • FIG. 10A is a diagram illustrating the fuel flow in the swirl passage 210 according to an embodiment of the present invention.
  • (a) shows the fuel flow velocity distribution in the swirl passage 210 as seen from the central axis 1a direction
  • FIG. 10A describes the configuration of the swirl passage 210 according to the embodiment of the present invention illustrated in FIG. 6C, the fuel flow in the configuration of FIG. The same holds true for the -6I form.
  • the intersection P1 between the center line 211Ax2 of the inclined passage section 2112 and the peripheral edge 300a of the fuel introduction hole 300 is located on the passage of the lateral passage 211. Further, the starting point P2 of the inclined passage portion 2112 is located on the periphery 300a of the fuel introduction hole 300 or on the inner side of the fuel introduction hole 300 than the periphery 300a of the fuel introduction hole 300 in the radial direction (radial direction) RD.
  • a long rectifying section F for rectifying the fuel flow can be secured outside the peripheral edge 300a of the fuel introduction hole 300 and on the upstream side of the swirling chamber 212.
  • the length of the rectifying section F is set to be greater than or equal to the width W211 of the lateral passage 211 (see FIG. 5) and the width W211 of the inclined passage 2112, for example.
  • the swirling chamber 212 is arranged so as to protrude radially outward with respect to the outer circumferential passage portion 2112. That is, the center O2 of the inlet opening 220i of the fuel injection hole 220 is located on the outside in the radial direction with respect to the center line L3 of the lateral passage 211. Moreover, the center O1 of the swirling chamber 212 is located on the outside in the radial direction with respect to the center line L3 of the lateral passage 211.
  • the flow flowing in the radial direction and flowing into the inclined passage section 2112 tends to be biased toward the side wall 211i.
  • this embodiment by arranging the intersection point P1 and the starting point P2 as described above, it is possible to suppress the fuel flow component in the radial direction and increase the fuel flow component along the inclination direction of the inclined passage section 2112. .
  • the rectification section F can be ensured for a long time, and the balance of the fuel flow can be improved, so that the bias of the fuel flow toward the side wall 211i can be suppressed.
  • the fuel flow component biased toward the side wall 211i of the inclined passage portion 2112 increases too much, the amount of fuel flowing directly into the fuel injection hole 220 will increase, and the amount of fuel flowing through the swirling chamber 212 and flowing into the fuel injection hole 220 will decrease.
  • the balance between the fuel flow that directly flows into the fuel injection hole 220 and the fuel flow that swirls in the swirl chamber 212 and flows into the fuel injection hole 220 can be maintained within an appropriate range, and the swirl component ⁇ is expanded.
  • the swirl component ⁇ is expanded.
  • FIG. 10B is a diagram illustrating the fuel flow in the swirl passage 210 according to a comparative example (second comparative example) with the present invention.
  • (a) shows the fuel flow velocity distribution in the swirl passage 210 as seen from the central axis 1a direction
  • (b) shows the fuel flow velocity distribution in the BB cross section of (a)
  • (c ) shows the fuel flow velocity distribution at the CC cross section (the outlet of the fuel injection hole) in (b).
  • FIG. 10B illustrates a configuration in which the turning passage 210 illustrated in FIG. 6A is used, and the curved passage portion 2113 of the lateral passage 211 is located outside the fuel introduction hole 300 relative to the periphery 300a of the fuel introduction hole 300.
  • the fuel flow component that is biased toward the side wall 211i of the inclined passage portion 2112 increases too much, and the amount of fuel flow that directly flows into the fuel injection hole 220 increases. As a result, the amount of fuel flowing through the swirling chamber 212 and flowing into the fuel injection hole 220 is reduced.
  • FIG. 11A is a diagram showing fuel distribution ratios of fuel sprays SPS1 to SPS4 injected from swirl passages 210-1 to 210-4 according to an embodiment of the present invention.
  • (a) shows the fuel distribution ratio in the cross section of the fuel spray SPS injected from one swirling passage 210
  • (b) shows the entire spray injected from four swirling passages 210-1 to 210-4.
  • the fuel distribution ratio of SPH (c) is the fuel distribution ratio in the cross section of the entire spray SPH injected from the four swirling passages 210-1 to 210-4.
  • FIG. 11B is a diagram showing the fuel distribution ratio of fuel sprays SPS1 to SPS4 injected from the swirl passages 210-1 to 210-4 according to a comparative example (second comparative example) with the present invention.
  • FIG. 11B (a) shows the fuel distribution ratio in the cross section of the fuel spray SPS injected from one swirling passage 210, and (b) shows the entire spray injected from four swirling passages 210-1 to 210-4.
  • the fuel distribution ratio of SPH (c) is the fuel distribution ratio in the cross section of the entire spray SPH injected from the four swirling passages 210-1 to 210-4.
  • the amount of fuel flowing directly into the fuel injection hole 220 increases, reducing the atomization effect and causing the particle size of the fuel spray to become coarser, which slightly affects the fuel distribution ratio of the entire spray SPH. However, peaks are more likely to occur.
  • FIG. 12 is a sectional view of an internal combustion engine in which the fuel injection valve 1 is mounted.
  • a cylinder 102 is formed in the engine block 101 of the internal combustion engine 100, and an intake port 103 and an exhaust port 104 are provided at the top of the cylinder 102.
  • the intake port 103 is provided with an intake valve 105 that opens and closes the intake port 103
  • the exhaust port 104 is provided with an exhaust valve 106 that opens and closes the exhaust port 104.
  • An intake pipe 108 is connected to an inlet side end 107a of an intake passage 107 formed in the engine block 101 and communicating with the intake port 103.
  • a fuel pipe 110 is connected to the fuel supply port 2 (see FIG. 1) of the fuel injection valve 1.
  • a mounting portion 109 for the fuel injection valve 1 is formed in the intake pipe 108, and an insertion port 109a into which the fuel injection valve 1 is inserted is formed in the mounting portion 109.
  • the insertion port 109a penetrates to the inner wall surface (intake flow path) of the intake pipe 108, and fuel injected from the fuel injection valve 1 inserted into the insertion port 109a is injected into the intake flow path.
  • intake flow path the inner wall surface

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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

Dans la présente soupape d'injection de carburant, un passage latéral (211) présente une partie de passage inclinée (2112) qui est inclinée par rapport à une direction radiale (RD) centrée sur un axe central (1a) de la soupape d'injection de carburant sur une vue de projection (fig. 6A) projetée sur un plan virtuel perpendiculaire à l'axe central (1a). Un point d'intersection (P1) entre un axe central (211Ax2) de la partie de passage inclinée (2112) et un bord périphérique (300a) d'un trou d'introduction de carburant (300) est positionné sur le passage du passage latéral (211). En variante, un point de départ (P2) de la partie de passage inclinée (2112) est positionné sur le bord périphérique (300a) du trou d'introduction de carburant (300) ou plus loin dans le trou d'introduction de carburant (300) que le bord périphérique (300a) du trou d'introduction de carburant (300). Grâce à cette configuration, dans une soupape d'injection de carburant qui combine de multiples pulvérisateurs déviés pour injecter une pulvérisation globale, il est possible, entre autres, de modifier la forme de la pulvérisation globale ou de modifier le rapport de distribution de carburant dans une section transversale de la pulvérisation globale.
PCT/JP2023/007719 2022-05-12 2023-03-02 Soupape d'injection de carburant WO2023218736A1 (fr)

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JP2022-078626 2022-05-12
JP2022078626A JP2023167439A (ja) 2022-05-12 2022-05-12 燃料噴射弁

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006336577A (ja) * 2005-06-03 2006-12-14 Hitachi Ltd 燃料噴射弁とこれを用いた内燃機関
JP2016070243A (ja) * 2014-10-01 2016-05-09 三菱電機株式会社 燃料噴射弁
JP2018165512A (ja) * 2018-08-02 2018-10-25 日立オートモティブシステムズ株式会社 燃料噴射弁
JP2021046813A (ja) * 2019-09-18 2021-03-25 日立オートモティブシステムズ株式会社 燃料噴射弁

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006336577A (ja) * 2005-06-03 2006-12-14 Hitachi Ltd 燃料噴射弁とこれを用いた内燃機関
JP2016070243A (ja) * 2014-10-01 2016-05-09 三菱電機株式会社 燃料噴射弁
JP2018165512A (ja) * 2018-08-02 2018-10-25 日立オートモティブシステムズ株式会社 燃料噴射弁
JP2021046813A (ja) * 2019-09-18 2021-03-25 日立オートモティブシステムズ株式会社 燃料噴射弁

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