WO2013011584A1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
WO2013011584A1
WO2013011584A1 PCT/JP2011/066584 JP2011066584W WO2013011584A1 WO 2013011584 A1 WO2013011584 A1 WO 2013011584A1 JP 2011066584 W JP2011066584 W JP 2011066584W WO 2013011584 A1 WO2013011584 A1 WO 2013011584A1
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WIPO (PCT)
Prior art keywords
fuel
injection
injection hole
hole plate
flow
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PCT/JP2011/066584
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English (en)
Japanese (ja)
Inventor
夏樹 杉山
伊藤　弘和
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トヨタ自動車株式会社
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Application filed by トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Priority to PCT/JP2011/066584 priority Critical patent/WO2013011584A1/fr
Publication of WO2013011584A1 publication Critical patent/WO2013011584A1/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
    • 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
    • F02M61/1853—Orifice plates

Definitions

  • the present invention relates to a fuel injection valve that injects fuel, and particularly to a fuel injection valve having a plurality of injection holes.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2010-65541
  • a fuel injection valve having a plurality of injection holes is known.
  • a circular injection hole plate is provided at the tip of the injection valve body, and each injection hole is formed in this injection hole plate.
  • Each injection hole is arranged radially with respect to the center of the injection hole plate, and the axis of each injection hole is inclined from the center toward the outer diameter side with respect to the center axis of the injection hole plate. . That is, in the radial direction of the nozzle hole plate, the outlets of the individual nozzle holes are opened outside the inlet. Thereby, in the prior art, atomization of the injected fuel is promoted.
  • the applicant has recognized the following documents including the above-mentioned documents as related to the present invention.
  • each injection hole is inclined from the center of the injection hole plate toward the outer diameter side.
  • the fuel flows from the entire circumference into the inlet of the injection hole, so that the fuel flows easily collide with each other at the center of the injection hole. This collision tends to suppress the flow of fuel flowing out from the injection hole and increase the thickness of fuel in the injection hole (so-called bulk thickness).
  • the average particle size of the injected fuel increases as the bulk thickness increases. For this reason, in the prior art, there is a problem that atomization of the injected fuel is hindered due to an increase in bulk thickness.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the thickness of the fuel in the injection hole and promote the atomization of the injected fuel. It is to provide an injection valve.
  • an injection hole plate having an inner surface facing a fuel supply space to which fuel is supplied when the valve body is opened and an outer surface facing the outside,
  • a plurality of injection holes provided as through-holes in the nozzle hole plate, each having a fuel inlet opening on an inner surface of the nozzle hole plate and a fuel outlet opening on the outer surface;
  • An uneven portion provided on the inner side surface of the injection hole plate, which surrounds at least a half or more of the fuel inlet except for a part of the entire circumference of the fuel inlet of the injection hole serving as a fuel introduction part.
  • a fuel flow restraining portion arranged as follows, It is characterized by providing.
  • the fuel flow suppressing portion surrounds the fuel inlet except for a portion of the entire circumference of the fuel inlet that the fuel supplied to the fuel supply space reaches in the shortest distance.
  • the fuel introduction part is arranged at a portion where the fuel supplied to the fuel supply space reaches the shortest distance.
  • a third aspect of the invention is a valve body that is attached to and detached from an annular valve seat;
  • a fuel supply space formed on the inner peripheral side of the valve seat, to which fuel is supplied from the outer peripheral side of the valve seat when the valve body is opened;
  • An injection hole plate formed of a circular plate material, and having an inner surface facing the fuel supply space and an outer surface facing the outside;
  • a plurality of injection holes provided as through-holes in the nozzle hole plate, each having a fuel inlet opening on an inner surface of the nozzle hole plate and a fuel outlet opening on the outer surface;
  • An uneven portion provided on the inner side surface of the nozzle hole plate, which surrounds the fuel inlet except for a portion of the entire circumference of the fuel inlet of the injection hole that is farthest from the center of the nozzle hole plate.
  • a fuel flow restraining portion arranged as follows, A fuel introduction part constituted by a part where the fuel flow suppression part is not arranged in the entire circumference of the fuel inlet; It is characterized by
  • the fuel inlet of the injection hole is formed in an elliptical shape or an oval shape that extends in the radial direction of the injection hole plate.
  • the plurality of injection holes are arranged radially with respect to the center of the injection hole plate.
  • the plurality of injection holes are arranged symmetrically with respect to one straight line extending in the radial direction through the center of the injection hole plate.
  • the fuel flow suppressing portion is formed as a concavo-convex portion continuously extending over the periphery of at least two fuel inflow ports.
  • the fuel flow suppressing portion is constituted by dimples in which a plurality of concave portions and convex portions are regularly arranged.
  • the first invention when the fuel flows into the injection hole, resistance can be added to the flow of the fuel at the position of the fuel flow suppressing portion, and the flow of the fuel flowing into the injection hole can be inhibited. Thereby, the flow of the fuel flowing into the injection hole from the position of the fuel introduction part can be relatively accelerated. For this reason, by appropriately adjusting the formation position of the fuel flow suppressing portion with respect to the entire circumference of the injection hole, the fuel can be caused to flow into the injection hole at a desired position so that the fuel is easily separated from the inner wall surface of the injection hole. it can.
  • the thickness of the fuel in the injection hole can be reduced and fuel atomization can be promoted, and the atomization ability can be increased.
  • a high injection hole plate can be easily formed at low cost.
  • the arrangement of the injection holes can be freely set, and the degree of freedom in design can be improved.
  • the valve element when the valve element is opened, the fuel supplied to the fuel supply space reaches the fuel introduction portion in the shortest distance, so that the fuel can smoothly flow into the injection hole. Thereby, the flow of the fuel flowing into the injection hole from the fuel flow suppressing portion can be further suppressed, and the fuel inflow can be concentrated on the fuel introducing portion.
  • fuel can be caused to flow into the injection hole from the fuel introduction portion located on the outermost diameter side in the radial direction of the injection hole plate in the entire circumference of the fuel inlet of the injection hole.
  • the fuel supplied from the outer diameter side of the nozzle hole plate flows into the outer diameter side of the fuel inlet, so that the fuel flow is bent sharply toward the outer diameter near the inlet of the injection hole.
  • the fuel can be atomized by reducing the thickness of the fuel in the injection hole. Therefore, it is possible to easily form an injection hole plate with high atomization capability at low cost simply by forming an uneven fuel flow suppression portion on the inner surface of the injection hole plate, and the degree of freedom in designing the injection hole. Can be improved.
  • the fuel is caused to flow intensively from the end portion in the longitudinal direction (the outer diameter side of the injection hole plate) with respect to the fuel inlet of the injection hole formed in an elliptical shape or an oval shape.
  • the fuel can be efficiently peeled from the outer diameter side portion of the inner wall surface of the injection hole.
  • fuel can be intensively introduced from the end portion in the longitudinal direction (outer diameter side of the nozzle hole plate) with respect to the fuel inlet of each nozzle hole arranged radially,
  • the fuel can be efficiently separated from the outer diameter side portion of the inner wall surface of the injection hole.
  • the fuel flow suppression unit and the fuel introduction unit By adjusting the arrangement, fuel can be introduced from the end of the injection hole on the outer diameter side. Therefore, the degree of freedom in designing the injection hole can be improved while ensuring the atomization level of the injected fuel.
  • the fuel flow suppressing portion is formed so as to straddle the periphery of at least two or more fuel inlets, the fuel flow suppressing portion can be efficiently formed for a large number of injection holes.
  • the fuel flow suppressing portion and the fuel introducing portion can be accurately aligned with respect to each injection hole.
  • the fuel flow suppressing portion is constituted by dimples in which a plurality of concave portions and convex portions are regularly arranged, for example, the effect of suppressing the fuel flow with respect to the formation area of the fuel flow suppressing portion can be easily achieved. Therefore, the nozzle plate can be designed efficiently.
  • FIG. 5 is an explanatory diagram showing a bulk generated during fuel injection.
  • Embodiment 2 of this invention it is the top view which looked at the nozzle hole plate from the same position as FIG. It is a principal part enlarged view in FIG. 6 which expands and shows one injection hole.
  • FIG. 9 is a plan view of the injection hole in FIG. 8 as viewed from the direction of arrow BB. It is a top view which shows the nozzle hole plate in another comparative example.
  • FIG. 8 is an enlarged view of a main part similar to FIG. 7 illustrating, as a comparative example, a case where there is no fuel flow suppression unit in the same injection hole as in the second embodiment of the present invention.
  • FIG. 1 is a cross-sectional view showing a fuel injection valve according to Embodiment 1 of the present invention.
  • FIG. 1 shows only the tip of the fuel injection valve.
  • the fuel injection valve 1 is composed of a known needle valve or the like, and includes a housing 2, a valve seat 3, a valve body 4, an injection hole plate 10, and the like.
  • the housing 2 is formed in a stepped cylindrical shape with a metal material or the like, and at least a tip portion is open.
  • An annular valve seat 3 on which the valve body 4 is seated is attached to the inner peripheral side of the distal end portion of the housing 2.
  • a rod-shaped valve body 4 is provided inside the housing 2.
  • the valve body 4 is separated from and seated on the valve seat 3 by being displaced in the axial direction, and is driven by an actuator such as a solenoid disposed on the base end side of the housing 2. Further, a fuel passage 5 that is a cylindrical gap is provided between the housing 2 and the valve body 4, and the fuel passage 5 is located on the outer peripheral side of the valve seat 3. Fuel flows into the fuel passage 5 in a pressurized state from a fuel pipe or the like connected to the base end side of the housing 2. On the other hand, a fuel supply space 6, which is a flat cylindrical space, is provided between the distal end surface of the valve body 4 and the nozzle hole plate 10, and the fuel supply space 6 is positioned on the inner peripheral side of the valve seat 3. is doing. Fuel is supplied to the fuel supply space 6 from the fuel passage 5 when the valve body 4 is opened.
  • the valve seat 3, the valve body 4, the fuel supply space 6, and the nozzle hole plate 10 are arranged coaxially with each other. The nozzle hole plate 10 will be described later.
  • FIGS. 1 to 4 the nozzle hole plate 10 that is a feature of the present embodiment will be described.
  • 2 is a cross-sectional view showing the nozzle hole plate in FIG. 1 alone
  • FIG. 3 is a plan view of the nozzle hole plate as viewed from the direction of arrow A in FIG.
  • FIG. 4 is an enlarged view of a main part in FIG. 3 showing one injection hole in an enlarged manner.
  • the nozzle hole plate 10 is formed of a circular metal plate or the like, and is attached to the tip portion at a position covering the tip portion of the housing 2.
  • the nozzle hole plate 10 has an inner side surface 10 a facing the inside of the housing 2 (fuel supply space 6) and an outer side surface 10 b facing the outside of the housing 2.
  • a short cylindrical mounting portion F is formed on the peripheral edge portion of the nozzle hole plate 10 and this mounting portion F is mounted on the outer periphery of the distal end portion of the housing 2 is exemplified.
  • the nozzle hole plate 10 having no attachment portion F may be fixed to the front end surface of the housing 2.
  • the injection hole plate 10 is provided with a plurality of injection holes 11 for injecting fuel.
  • Each injection hole 11 is formed as a through-hole penetrating the nozzle hole plate 10 in the axial direction.
  • the fuel inlet 11 a that opens on the inner surface 10 a of the nozzle hole plate 10, and the nozzle hole plate 10.
  • a fuel outlet 11b that opens to the outer surface 10b.
  • Each injection hole 11 is inclined toward the outer diameter side of the injection hole plate 10 such that the fuel outlet 11b is farther from the center O of the injection hole plate 10 than the fuel injection hole 11a.
  • the injection holes 11 are arranged radially with respect to the center O of the injection hole plate 10 and are arranged in a double concentric manner. Further, as shown in FIGS.
  • the fuel inlet 11 a and the fuel outlet 11 b of the injection hole 11 are formed in an elliptical shape or an oval shape, and are elongated in the radial direction of the injection hole plate 10. That is, the extending directions of the major axes of the fuel inlet 11 a and the fuel outlet 11 b coincide with the radial direction of the nozzle hole plate 10.
  • a fuel flow suppressing portion 12 and a fuel introducing portion 13 are provided on the inner side surface 10 a of the nozzle hole plate 10.
  • the fuel flow suppressing portion 12 is formed by a concavo-convex portion, and is preferably formed as a dimple in which a plurality of concave portions and convex portions are alternately arranged regularly.
  • the fuel flow suppressing portion 12 is a portion of at least a half or more (preferably 3/4 or more) of the fuel inlet 11a, except for a part of the entire circumference of the fuel inlet 11a, which becomes the fuel introduction portion 13. It is arranged so that it surrounds.
  • the fuel flow suppression unit 12 adds resistance to the fuel flow in the vicinity of the inner surface 10a, and suppresses (inhibits) the flow of fuel flowing into the injection hole 11 from a position (direction) other than the fuel introduction unit 13. To do.
  • the fuel introduction part 13 is arranged in a part (preferably, a part less than 1 ⁇ 4 circumference) of the entire circumference of the fuel inflow port 11a where the fuel flow suppression part 12 is not arranged. It is comprised by the inner surface 10a.
  • the fuel introduction unit 13 introduces fuel into the injection hole 11 from a specific position (direction) using the function of the fuel flow suppression unit 12. More specifically, since the fuel flow is relatively smooth at the position of the fuel introduction portion 13 as compared with the portion where the fuel flow suppression portion 12 is formed, the flow of the fuel flowing into the injection hole 11 can be promoted. it can.
  • FIG. 8 is an enlarged view of the main part showing the tip of the fuel injection valve 100 employed as a comparative example
  • FIG. 9 is a plan view of the injection hole 107 in FIG. 8 as viewed from the direction of arrows BB.
  • the fuel injection valve 100 includes a housing 101, a valve seat 102, a valve body 103, a fuel passage 104, a fuel supply space 105, an injection hole plate 106, and an injection hole 107.
  • the fuel in order to atomize the injected fuel, the fuel is preferably separated from the wall surface in the injection hole 107.
  • the injection hole 107 is formed so as to be inclined so that the outflow port is on the outer diameter side of the fuel inflow port, and flows into the fuel supply space 105 from the outer diameter side of the injection hole plate 106.
  • the fuel flow is bent sharply toward the outer diameter side at the inlet of the injection hole 107.
  • the flow of fuel can be separated from the inner wall surface of the injection hole 107 located on the inner diameter side of the injection hole plate 106, and a certain degree of atomization is realized. can do.
  • the fuel in the fuel supply space 105 flows from the entire circumference to the inlet of the injection hole 107, so that the fuel flow collides at the center of the injection hole.
  • the thickness (bulk thickness) of the fuel in the injection hole 107 increases, and atomization of the injected fuel is hindered.
  • FIG. 10 is a plan view showing an injection hole plate in another comparative example.
  • radial protrusions (partitions) 108 are provided on the inner surface of the injection hole plate 106, and the flow of fuel flowing into the injection holes 107 is rectified by the protrusions 108.
  • the fuel flows into the injection holes from the entire periphery, so that atomization is hindered for the above-described reason.
  • the portion farthest from the center O of the injection hole plate 10 is excluded from the entire circumference of the fuel inlet 11 a of each injection hole 11.
  • the fuel flow suppressing portion 12 is arranged, and the fuel introducing portion 13 is arranged at a portion farthest from the center O in the entire circumference of the fuel inflow port 11a. That is, the portion where the fuel introduction portion 13 is disposed is a portion located on the outermost diameter side of the nozzle hole plate 10 in the entire circumference of the fuel inlet 11a, and this portion is outside when the valve body 4 is opened. This corresponds to the portion where the fuel supplied from the radial valve seat 3 to the fuel supply space 6 reaches the fuel inlet 11a in the shortest distance.
  • the flow of the fuel flowing into the injection hole 11 from another part is further suppressed, and most of the fuel flowing into the injection hole 11 is concentrated on the fuel introducing part 13. That is, since the fuel supplied from the outer diameter side of the nozzle hole plate 10 flows into the outer diameter side of the fuel inlet 11a, the fuel flow is suddenly directed toward the outer diameter near the inlet of the injection hole 11. Can be bent. As a result, in the present embodiment, as shown in FIG. 4, the fuel flow can be largely separated from the portion located on the outer diameter side of the injection hole plate 10 on the inner wall surface of the injection hole 11. Compared to the above-described comparative example (FIG. 9), the fuel thickness (bulk thickness) in the injection hole 11 can be reduced.
  • FIG. 5 is an explanatory diagram schematically showing a bulk generated during fuel injection.
  • 5A shows a cross-sectional view of the injection hole 11
  • FIG. 5B shows a bottom view of the injection hole 11 viewed from the fuel outlet 11b side.
  • the bulk is a flow of fuel having a relatively high density ejected from the injection holes 11 in a columnar shape, and a film that is a mist-like fuel having a low density is formed around the bulk.
  • the bulk thickness h is defined as a bulk thickness dimension at the opening position of the fuel outlet 11b.
  • the thickness dimension is a dimension in a direction along the inflow direction of fuel to the injection hole 11 (in the present embodiment, the radial direction of the injection hole plate 10). Generally, between the average particle diameter D 30 and the bulk thickness h of the injected fuel of the injected fuel, the relationship is established as shown in the following equation (1).
  • This formula is called a FRAZER formula, and is a known relational formula described in Japanese Patent Laid-Open No. 2002-168163, for example.
  • C1 and C2 are constants
  • V is the fuel flow velocity
  • ⁇ is the surface tension of the fuel
  • ⁇ L and ⁇ a are the fuel and air densities. If denoted as C collectively constants in equation (1), it can be obtained right, mean particle diameter D 30 of the fuel is found to be smaller as the bulk thickness h is reduced.
  • the fuel introduction that is a non-formation portion of the fuel flow restraining portion 12 is provided only by providing the fuel flow restraining portion 12 having an uneven shape on the inner side surface 10a of the nozzle hole plate 10.
  • the fuel can smoothly flow into the injection hole 11 from the portion 13, and the bulk thickness h of the fuel can be reduced. Thereby, atomization of the injected fuel can be promoted and the performance of the fuel injection valve 1 can be improved.
  • the fuel flow suppressing portion 12 can be formed together by relatively simple processing, for example, when the nozzle hole plate 10 is formed, and separate parts are assembled to the nozzle hole plate as in the other comparative examples described above. There is no need to put it on. Therefore, since the management of processing accuracy is relatively gradual and the number of processing steps does not increase greatly, an injection hole plate with high atomization capability can be easily formed at low cost.
  • the fuel inflow direction with respect to the injection hole 11 can be adjusted by the fuel flow suppression unit 12 and the fuel introduction unit 13 without depending on the shape of the fuel supply space 6 or the like. That is, even if each injection hole 11 is arranged asymmetrically or a part where the injection holes are gathered is provided in a part of the injection hole plate 10, the position where the fuel flow suppressing portion 12 is formed with respect to each injection hole 11. If this is set appropriately, fuel can flow into each injection hole 11 from a desired direction. Therefore, the arrangement of the injection holes can be set more freely than in the comparative examples, and the degree of design freedom can be improved. This effect will be specifically described in the second embodiment.
  • a plurality of injection holes 11 are arranged in a double concentric manner to form the first and second injection hole groups G1 and G2, and individual injections are made.
  • Two fuel flow suppression portions 12 (hereinafter referred to as fuel flow suppression portions 12A and 12B) and two fuel introduction portions 13 (referred to as fuel introduction portions 13A and 13B) are formed corresponding to the hole groups G1 and G2. It is configured to do.
  • the first fuel flow suppressing portion 12A is formed as an annular concavo-convex portion extending along the outer peripheral injection hole group G1, and surrounds the inner diameter side of each fuel inlet 11a of the injection hole group G1.
  • the first fuel flow restraining portion 13A is disposed over the entire circumference on the outer diameter side of the fuel flow restraining portion 12A, and takes a portion located on the outermost diameter side of each fuel inlet 11a of the injection hole group G1. It is arranged to surround.
  • the second fuel flow suppression portion 12B is formed as a circular concavo-convex portion, and is disposed on the inner peripheral side of the fuel flow suppression portion 12A with a radial interval.
  • the fuel flow suppressing portion 12B has a contour corresponding to the formation portion of the injection hole group G2 on the inner peripheral side, and is disposed so as to surround the inner diameter side of each fuel inlet 11a of the injection hole group G2.
  • the second fuel flow suppressing portion 13B is formed in an annular shape between the fuel flow suppressing portions 12A and 12B, and a portion positioned on the outermost diameter side of each fuel inlet 11a of the injection hole group G2. They are arranged to surround each other.
  • each of the fuel flow restraining portions 12A and 12B is formed as a concavo-convex portion continuously extending over the periphery of the two or more fuel inflow ports 11a.
  • the fuel flow suppression part 12 can be efficiently formed with respect to many injection holes 11, and the fuel flow suppression part 12 and the fuel introduction part 13 are accurately aligned with respect to each injection hole 11.
  • the effect of suppressing the fuel flow on the formation area of the fuel flow suppressing portion 12 can be easily estimated.
  • the nozzle hole plate 10 can be designed efficiently.
  • Embodiment 2 a second embodiment of the present invention will be described with reference to FIGS.
  • the present embodiment is characterized in that a plurality of injection holes are arranged symmetrically with respect to one straight line.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • FIG. 6 is a plan view of the nozzle hole plate seen from the same position as in FIG. 3 in Embodiment 2 of the present invention.
  • FIG. 7 is an enlarged view of a main part in FIG. 6 showing one injection hole in an enlarged manner.
  • the plurality of injection holes 21 are symmetric left and right with respect to one straight line (for example, the Y axis) extending in the radial direction through the center O of the injection hole plate 10. Is arranged.
  • each injection hole 21 is divided into left and right inner injection hole groups G1in and G2in and left and right outer injection hole groups G1out and G2out.
  • the injection holes 21 are arranged in a straight line for each of the injection hole groups G1in, G2in, G1out, and G2out, and the arrangement direction is set parallel to the Y axis.
  • each injection hole 21 is inclined toward the outer diameter side of the injection hole plate 10 such that the fuel outlet 21b is farther from the axis of symmetry (Y axis) than the fuel inlet 21a.
  • the fuel inlet 21a and the fuel outlet 21b of the injection hole 21 are formed in an elliptical shape or an oval shape, but along a straight line (for example, the X axis) perpendicular to the axis of symmetry. Elongate. That is, the major axes of the fuel inlet 21a and the fuel outlet 21b are arranged parallel to the X axis.
  • a fuel flow suppression unit 22 and a fuel introduction unit 23 are provided on the inner side surface 10 a of the nozzle hole plate 10, as in the first embodiment.
  • the fuel flow suppressing portion 22 is formed of dimples, and at least half of the circumference of the fuel inlet 21a except for a part of the entire circumference of the fuel inlet 21a serving as the fuel introduction portion 23 (preferably 3/4). It is arranged so as to surround the portion of the circumference.
  • the fuel introduction part 23 is arrange
  • the non-formation part of the fuel introduction part 23 includes the parts farthest from the center O and the Y axis of the injection hole plate 10 in the entire circumference of the fuel inlet 21a. In addition, it includes a portion where the fuel supplied from the outer diameter side valve seat 3 to the fuel supply space 6 when the valve body 4 is opened reaches the fuel inlet 21a in the shortest distance.
  • the fuel flow suppression unit 22 is divided into three fuel flow suppression units 22A, 22B, and 22C having a belt shape corresponding to the individual injection hole groups G1in, G2in, G1out, and G2out.
  • the fuel flow suppression portions 22A, 22B, and 22C are formed to be divided into four fuel introduction portions 23A, 23B, 23C, and 23D. More specifically, the central fuel flow suppressing portion 22A is arranged so as to surround the inner diameter side of each fuel inlet 21a of the injection hole groups G1in and G2in.
  • the left fuel flow suppressing portion 22B is disposed so as to surround the inner diameter side of each fuel inlet 21a of the left injection hole group G1out, and the right fuel flow suppressing portion 22C is provided for each fuel of the right injection hole group G2out. It arrange
  • the fuel introduction portions 23A, 23B, 23C, and 23D are disposed so as to surround portions of the injection hole groups G1in, G2in, G1out, and G2out that are located on the outer diameter side of the respective fuel inflow ports 21a. Accordingly, each of the fuel flow suppressing portions 22A to 22C continuously extends over the periphery of the two or more fuel inflow ports 21a.
  • the flow suppression part 22 can be formed efficiently.
  • FIG. 11 is an enlarged view of the main part similar to FIG. 7 showing, as a comparative example, the case where the fuel flow suppressing part is not present in the injection hole similar to the second embodiment of the present invention.
  • the fuel flows obliquely into the injection hole 107, and pressure loss occurs due to the rotation of the fuel in the injection hole 107, so that the fuel is difficult to peel off from the inner wall of the injection hole 107.
  • this problem can be solved only by disposing the fuel flow suppressing portion 22 around the injection hole 21.
  • the fuel flow Fuel can be allowed to flow in from the end on the outer diameter side of the injection hole 21 only by adjusting the arrangement of the suppression portion 22 and the fuel introduction portion 23. Therefore, the degree of freedom in designing the injection hole 21 can be improved while ensuring the atomization level of the injected fuel.
  • the fuel flow suppression units 12 and 22 and the fuel introduction units 13 and 23 are arranged for all the injection holes 11 and 21 provided in the injection hole plate 10.
  • the present invention is not limited to this.
  • the fuel flow suppressing portion and the fuel introducing portion may be arranged only around some of the injection holes provided in the injection hole plate.
  • the present invention is not limited to this, and can be widely applied to injection holes of any shape including a circular shape.
  • the fuel injection valve 1 in which fuel is supplied from the outer diameter side of the nozzle hole plate 10 toward the center side when the valve body 4 is opened has been described as an example.
  • the present invention is not limited to this, and can be applied to a fuel injection valve of a type in which fuel is supplied from an arbitrary direction to an injection hole plate having an arbitrary shape. That is, according to the present invention, in various fuel injection valves having different valve seat positions, fuel supply directions, injection hole shapes and arrangements, etc., the fuel flow to the injection holes depends on the arrangement of the fuel flow suppression unit and the fuel introduction unit. The purpose is to adjust the inflow direction.
  • Fuel injection valve 2 Housing 3 Valve seat 4 Valve body 5 Fuel passage 6 Fuel supply space 10 Injection hole plate 10a Inner side surface 10b Outer side surface 11, 21 Injection hole 11a Fuel inflow port 11b Fuel outflow port 12 (12A, 12B), 22 (22A, 22B, 22C) Fuel flow suppression unit 13 (13A, 13B), 23 (23A, 23B, 23C, 23D) Fuel introduction unit G1, G2, G1in, G2in, G1out, G2out injection hole group

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

Abstract

L'invention concerne une soupape d'injection de carburant. Le but de la présente invention consiste à réduire l'épaisseur du carburant à l'intérieur d'un trou d'injection et à promouvoir l'atomisation du carburant injecté. Selon l'invention, une pluralité de trous d'injection (11) ayant un orifice d'arrivée de carburant (11a) et un orifice de sortie de carburant (11b) sont formés sur une plaque à trous d'injection (10) d'une soupape d'injection de carburant (1). Un inhibiteur d'écoulement de carburant (12) est placé sur une surface interne (10a) de la plaque à trous d'injection (10) et agencé de manière à entourer les orifices d'entrée de carburant (11a) à l'exception d'une partie de la circonférence des orifices d'entrée de carburant (11a) à utiliser comme unité d'introduction de carburant (13). L'inhibiteur d'écoulement de carburant (12) est formé de fossettes comprenant une pluralité de creux et de saillies. Ceci empêche le flux de carburant de circuler dans les trous d'injection (11) dans la position de l'inhibiteur d'écoulement de carburant (12) en ajoutant de la résistance à l'écoulement du carburant, et favorise de façon correspondante le flux de carburant qui circule dans les trous d'injection (11) dans la position de l'unité d'introduction de carburant (13). De cette façon, il est possible d'amener le carburant à couler vers les trous d'injection de carburant (11) à partir d'une position souhaitée dans laquelle l'atomisation est facilitée.
PCT/JP2011/066584 2011-07-21 2011-07-21 Soupape d'injection de carburant WO2013011584A1 (fr)

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PCT/JP2011/066584 WO2013011584A1 (fr) 2011-07-21 2011-07-21 Soupape d'injection de carburant

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014208974A (ja) * 2013-04-16 2014-11-06 三菱電機株式会社 燃料噴射弁

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1043640A (ja) * 1996-08-01 1998-02-17 Denso Corp 流体噴射ノズル
JP2004100500A (ja) * 2002-09-06 2004-04-02 Hitachi Ltd 燃料噴射弁およびそれを搭載した内燃機関
JP2005207291A (ja) * 2004-01-22 2005-08-04 Hitachi Ltd 燃料噴射弁及び燃料噴射方法
JP2008169722A (ja) * 2007-01-10 2008-07-24 Denso Corp 燃料噴射弁

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1043640A (ja) * 1996-08-01 1998-02-17 Denso Corp 流体噴射ノズル
JP2004100500A (ja) * 2002-09-06 2004-04-02 Hitachi Ltd 燃料噴射弁およびそれを搭載した内燃機関
JP2005207291A (ja) * 2004-01-22 2005-08-04 Hitachi Ltd 燃料噴射弁及び燃料噴射方法
JP2008169722A (ja) * 2007-01-10 2008-07-24 Denso Corp 燃料噴射弁

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014208974A (ja) * 2013-04-16 2014-11-06 三菱電機株式会社 燃料噴射弁

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