WO2014050266A1 - 燃料噴射弁 - Google Patents

燃料噴射弁 Download PDF

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Publication number
WO2014050266A1
WO2014050266A1 PCT/JP2013/069547 JP2013069547W WO2014050266A1 WO 2014050266 A1 WO2014050266 A1 WO 2014050266A1 JP 2013069547 W JP2013069547 W JP 2013069547W WO 2014050266 A1 WO2014050266 A1 WO 2014050266A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel injection
injection valve
swirl
chamber
fuel
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2013/069547
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
洋史 大野
小林　信章
貴博 齋藤
敦士 中井
岡本　良雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Systems Ltd
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 Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Priority to IN1578DEN2015 priority Critical patent/IN2015DN01578A/en
Priority to DE112013004715.2T priority patent/DE112013004715T5/de
Priority to CN201380037949.2A priority patent/CN104471235A/zh
Publication of WO2014050266A1 publication Critical patent/WO2014050266A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
    • 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 used for fuel injection of an engine.
  • Patent Document 1 discloses a fuel injection valve having a swirl chamber in which the corners of the bottom of the swirl chamber are formed in an edge shape.
  • the flow rate of the fuel flowing through the swirl chamber becomes slower as it approaches the wall of the swirl chamber, and in particular, the corner at the bottom of the swirl chamber is a place where it is difficult for the fuel to flow.
  • the fuel injection valve When the fuel injection valve is closed, it is desirable that the volume of fuel remaining (dead volume) is small, but the bottom corner of the swirl chamber is less likely to flow fuel, contributing to the promotion of fuel miniaturization when the valve is opened. Despite this small amount, there was a risk of increasing the dead volume.
  • the present invention has been made paying attention to the above problems, and an object of the present invention is to provide a fuel injection valve capable of reducing the dead volume.
  • the cross-sectional shape of the corner portion between the side portion and the bottom portion of the swirl application chamber and the communication passage is a curved shape.
  • the present invention it is possible to cut the volume of the portion where the fuel that contributes to the promotion of miniaturization is small, and to reduce the dead volume without affecting the fuel miniaturization.
  • FIG. 1 It is an axial sectional view of the fuel injection valve of Embodiment 1. It is an expanded sectional view near the nozzle plate of the fuel injection valve of Embodiment 1.
  • 2 is a perspective view of a nozzle plate according to Embodiment 1.
  • FIG. It is the top view and sectional view of the nozzle plate of Embodiment 1.
  • It is a schematic cross section of the communicating path of Embodiment 1, and a swirl grant chamber. It is the figure which described the flow of the fuel in the perspective view of the swirl chamber of Embodiment 1, and a fuel injection hole.
  • It is a perspective view of the nozzle plate of Embodiment 3.
  • FIG. 1 is an axial sectional view of the fuel injection valve 1.
  • the fuel injection valve 1 is a so-called low pressure fuel injection valve that is used in a gasoline engine for automobiles and injects fuel into an intake manifold.
  • the fuel injection valve 1 is formed integrally with a magnetic cylinder 2, a core cylinder 3 accommodated in the magnetic cylinder 2, a valve element 4 slidable in the axial direction, and the valve element 4.
  • the electromagnetic coil 9 slides the valve body 4 in the valve opening direction when energized, and the yoke 10 induces magnetic flux lines.
  • the magnetic cylinder 2 is made of a metal pipe made of a magnetic metal material such as electromagnetic stainless steel, for example, and is stepped as shown in FIG. 1 by using means such as deep drawing or press working or grinding. It is formed integrally with a cylinder.
  • the magnetic cylinder 2 has a large-diameter portion 11 formed on one end side and a small-diameter portion 12 having a smaller diameter than the large-diameter portion 11 and formed on the other end side.
  • the small diameter portion 12 is formed with a thin portion 13 that is partially thinned.
  • the small-diameter portion 12 includes a core tube housing portion 14 for housing the core tube body 3 on one end side from the thin wall portion 13 and a valve member 15 (the valve body 4, the valve shaft 5, the valve seat on the other end side from the thin wall portion 13. It is divided into a valve member accommodating portion 16 for accommodating the member 7).
  • the thin portion 13 is formed so as to surround a gap portion between the core cylinder 3 and the valve shaft 5 in a state where the core cylinder 3 and the valve shaft 5 described later are accommodated in the magnetic cylinder 2. .
  • the thin-walled portion 13 increases the magnetic resistance between the core tube housing portion 14 and the valve member housing portion 16 and magnetically blocks between the core tube housing portion 14 and the valve member housing portion 16.
  • the inner diameter of the large diameter portion 11 constitutes a fuel passage 17 that sends fuel to the valve member 15, and a fuel filter 18 that filters the fuel is provided at one end of the large diameter portion 11.
  • a pump 47 is connected to the fuel passage 17.
  • the pump 47 is controlled by a pump control device 54.
  • the core cylinder 3 is formed in a cylindrical shape having a hollow part 19 and is press-fitted into the core cylinder housing part 14 of the magnetic cylinder 2.
  • the hollow portion 19 accommodates a spring receiver 20 fixed by means such as press fitting.
  • a fuel passage 43 penetrating in the axial direction is formed at the center of the spring receiver 20.
  • the outer shape of the valve body 4 is formed in a substantially spherical shape, and has a fuel passage surface 21 cut in parallel with the axial direction of the fuel injection valve 1 on the circumference.
  • the valve shaft 5 has a large-diameter portion 22 and a small-diameter portion 23 whose outer shape is smaller than the large-diameter portion 22.
  • the valve body 4 is integrally fixed to the tip of the small diameter portion 23 by welding.
  • the black semicircle and black triangle in a figure have shown the welding location.
  • a spring insertion hole 24 is formed at the end of the large diameter portion 22.
  • a spring seat 25 having a smaller diameter than the spring insertion hole 24 is formed at the bottom of the spring insertion hole 24, and a stepped spring receiving portion 26 is formed.
  • a fuel passage hole 27 is formed at the end of the small diameter portion 23. The fuel passage hole 27 communicates with the spring insertion hole 24.
  • a fuel outflow hole 28 penetrating the outer periphery of the small diameter portion 23 and the fuel passage hole 27 is formed.
  • the valve seat member 7 includes a substantially conical valve seat 6, a valve body holding hole 30 formed on the one end side of the valve seat 6 so as to be substantially the same as the diameter of the valve body 4, and one end from the valve body holding hole 30.
  • An upstream opening 31 formed with a larger diameter toward the opening side and a downstream opening 48 opened to the other end side of the valve seat 6 are formed.
  • valve shaft 5 and the valve body 4 are accommodated in the magnetic cylinder 2 so as to be slidable in the axial direction.
  • a coil spring 29 is provided between the spring receiving portion 26 of the valve shaft 5 and the spring receiver 20 to urge the valve shaft 5 and the valve body 4 to the other end side.
  • the valve seat member 7 is inserted into the magnetic cylinder 2 and fixed to the magnetic cylinder 2 by welding.
  • the valve seat 6 is formed so that the diameter decreases from the valve body holding hole 30 toward the downstream opening 48 at an angle of about 45 °, and the valve body 4 is seated on the valve seat 6 when the valve is closed. Yes.
  • An electromagnetic coil 9 is inserted into the outer periphery of the core cylinder 3 of the magnetic cylinder 2.
  • the electromagnetic coil 9 is arranged on the outer periphery of the core cylinder 3.
  • the electromagnetic coil 9 includes a bobbin 32 formed of a resin material and a coil 33 wound around the bobbin 32.
  • the coil 33 is connected to the electromagnetic coil control device 55 via the connector pin 34.
  • the electromagnetic coil control device 55 energizes the coil 33 of the electromagnetic coil 9 in accordance with the timing of injecting fuel into the combustion chamber calculated based on the information from the crank angle sensor that detects the crank angle. Open the valve.
  • the yoke 10 has a hollow through-hole, and is formed with a large-diameter portion 35 formed on one end opening side, a medium-diameter portion 36 formed with a smaller diameter than the large-diameter portion 35, and a diameter smaller than the medium-diameter portion 36. It is comprised from the small diameter part 37 formed in the other end opening side. The small diameter portion 37 is fitted to the outer periphery of the valve member housing portion 16. An electromagnetic coil 9 is accommodated on the inner periphery of the medium diameter portion 36.
  • a connecting core 38 is disposed on the inner periphery of the large diameter portion 35.
  • the connecting core 38 is formed in a substantially C shape by a magnetic metal material or the like.
  • the yoke 10 is connected to the magnetic cylinder 2 at the large diameter portion 35 via the small diameter portion 37 and the connecting core 38, that is, magnetically connected to the magnetic cylinder 2 at both ends of the electromagnetic coil 9. It will be.
  • a protector 52 for holding the O-ring 40 for connecting the fuel injection valve 1 to the intake port of the engine and protecting the tip of the magnetic cylinder is attached to the tip of the yoke 10 on the other end side.
  • the front end portion of the connector pin 34 is formed by opening a resin cover 53 so that the connector of the control unit can be inserted.
  • An O-ring 39 is provided on the outer periphery of one end of the magnetic cylinder 2, and an O-ring 40 is provided on the outer periphery of the small diameter portion 37 of the yoke 10.
  • a nozzle plate 8 is welded to the other end side of the valve seat member 7.
  • the nozzle plate 8 is injected with a plurality of swirl chambers 41 that give a swirl (swirl flow) to the fuel, a central chamber 42 that distributes the fuel to each swirl chamber 41, and fuel that has been swirled in the swirl chamber 41.
  • a fuel injection hole 44 is formed.
  • FIG. 2 is an enlarged cross-sectional view of the vicinity of the nozzle plate 8 of the fuel injection valve 1.
  • FIG. 3 is a perspective view of the nozzle plate 8.
  • FIG. 4 is a view (FIG. 4A) of the nozzle plate viewed from one end side in the axial direction (the side in contact with the valve seat member 7), and a cross-sectional view taken along the line AA (FIG. 4B).
  • 1 is a cross-sectional view taken along a line BB in FIG. 4A.
  • a swirl chamber 41 is formed on one side surface of the nozzle plate 8.
  • Four swirl chambers 41 are formed, each including a communication path 45 and a swirl application chamber 46. Each communication path 45 is connected near the center of the nozzle plate 8.
  • the communication path 45 is formed by a groove extending radially from the vicinity of the center of the nozzle plate 8. That is, the communication path 45 has a bottom portion 45a that becomes the bottom of the groove and a side surface portion 45b that stands up with respect to the bottom portion 45a.
  • a swirl application chamber 46 is formed at the tip of the communication passage 45.
  • the swirl application chamber 46 is formed in a bottomed concave shape. That is, the swirl imparting chamber 46 has a bottom portion 46a serving as a bottom and a side surface portion 46b erected on the bottom portion 46a.
  • a fuel injection hole 44 penetrating the other end side of the nozzle plate 8 is formed in the bottom 46 a of the swirl application chamber 46.
  • the side surface portion 46 b of the swirl application chamber 46 is formed in a spiral shape when viewed from one end side of the nozzle plate 8.
  • One side surface 45 b of the communication path 45 is connected to the side surface 46 b of the swirl application chamber 46 in the tangential direction.
  • FIG. 5 is a schematic cross-sectional view of the communication passage 45 and the swirl application chamber 46.
  • the radius of the corner 45d (corner portion 46d) between the side surface 8a on one end side of the nozzle plate 8 and the side surface portion 45b of the communication passage 45 (side surface portion 46b of the swirl application chamber 46) is r1, and the bottom portion 45a of the communication passage 45 is.
  • the size of the radius r2 of the corner 45c of the communication passage 45 (the corner 46c of the communication passage 45) is defined by the following equation. r1 ⁇ r2 ⁇ L / 2
  • the nozzle plate 8 is formed by cutting, pressing, etching, or the like, and the swirl chamber 41 and the fuel injection hole 44 are integrally formed on a single plate.
  • FIG. 6 is a perspective view of the swirl chamber 41 and the fuel injection hole 44 in which the fuel flow is described.
  • the space between the valve body 4 and the valve seat 6 is released, and fuel is supplied to the nozzle plate 8 side.
  • the fuel supplied to the nozzle plate 8 first enters the central chamber 42, collides with the bottom surface of the central chamber 42, thereby converting the axial flow into the radial flow and flows into each communication passage 45. Since the communication path 45 is connected in the tangential direction of the swirl application chamber 46, the fuel that has passed through the communication path 45 swirls along the inner surface of the swirl application chamber 46.
  • a swirl force (swirl force) is applied to the fuel in the swirl imparting chamber 46, and the fuel having the swirl force is injected while swirling along the side wall portion of the fuel injection hole 44.
  • the fuel injected from the fuel injection hole 44 is scattered in the tangential direction of the fuel injection hole 44.
  • the fuel spray immediately after being injected from the fuel injection hole 44 becomes a liquid film state in which the fuel is formed into a film shape on the spray surface of a substantially hollow cone shape by the edge portion of the opening of the fuel injection hole 44.
  • the fuel spray that has been in the form of a film gradually starts to split and enters a liquid yarn state. Further, the splitting further proceeds, and the fuel is in a droplet state split into particles.
  • the dead volume refers to a volume in which fuel remains in the downstream opening 48, the swirl chamber 41, and the fuel injection hole 44 when the fuel injection valve 1 is closed.
  • the inside of the intake manifold into which the fuel injection valve 1 injects fuel becomes negative pressure, the remaining fuel boils under reduced pressure, causing the flow rate to vary with respect to the target fuel flow rate.
  • the fluid generally has the highest flow velocity near the center of the flow channel, and the flow velocity is slower as it is closer to the wall of the flow channel.
  • the corner 45c of the communication passage 45 and the corner 46c of the swirl application chamber 46 are formed in an edge shape, the corners 45c and 46c are surrounded by walls, so that the fuel flow rate is particularly slow. That is, the fuel flowing in the vicinity of the corner portion 45c of the communication passage 45 and in the vicinity of the corner portion 46c of the swirl imparting chamber 46 has little contribution to the promotion of fuel miniaturization, but the vicinity of the corner portion 45c of the communication passage 45 and the swirl.
  • the vicinity of the corner 46c of the applying chamber 46 was a cause of an increase in dead volume.
  • the corner 45c between the bottom 45a and the side surface 45b of the communication passage 45 and the corner 46c between the bottom 46a and the side surface 46b of the swirl application chamber 46 are connected to the nozzle plate 8 with each other. It was formed to have an R shape (curved shape) in a cross section parallel to the axial direction. As a result, the volume of the portion of the communication passage 45 and the swirl imparting chamber 46 where the fuel that contributes to the miniaturization promotion is small can be reduced, and the dead volume can be reduced without affecting the fuel miniaturization. it can.
  • a valve body 4 provided so as to be capable of opening and closing, a valve seat 6 on which the valve body 4 sits when the valve is closed, and a valve seat member 7 having a downstream opening 48 on the downstream side, and a valve seat member 7, a nozzle plate 8 provided downstream of the nozzle plate 8, a swirl imparting chamber 46 that is formed in a concave shape on the valve seat member 7 side of the nozzle plate 8 and that imparts a swirling force by swirling fuel therein, and a swirl imparting chamber 46.
  • the cross-sectional shapes of the corner portion 46c of the swirl imparting chamber 46 and the corner portion 45c of the communication passage 45 are curved, the side surface of the valve seat member 7 of the nozzle plate 8, and the swirl imparting chamber.
  • the radius of the cross-sectional shape of the corner 45d is r1
  • the radius of the cross-section of the corner 46c of the swirling chamber 46 and the corner 45c of the communication passage 45 is r2
  • the width of the swirling chamber 46 and the communication passage 45 is W.
  • r2 ⁇ W / 2 The swirl imparting chamber 46 and the communication path 45 were formed so as to satisfy the following formula.
  • the depths of the swirl chamber 46 and the communication passage 45 are L
  • the swirl imparting chamber 46 and the communication path 45 were formed so as to satisfy the following formula. Therefore, the volume of the portion of the communication passage 45 and the swirl imparting chamber 46 where the fuel that contributes to the miniaturization promotion is small can be reduced, and the dead volume can be reduced without affecting the fuel miniaturization. .
  • FIG. 7 is a perspective view of the nozzle plate 8 used in the fuel injection valve of the second embodiment.
  • two swirl chambers 41 may be formed as shown in this figure.
  • FIG. 8 is a view showing the nozzle plate 8 provided for the fuel injection valve of the third embodiment.
  • six swirl chambers 41 may be formed as shown in FIG.

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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)
PCT/JP2013/069547 2012-09-26 2013-07-18 燃料噴射弁 Ceased WO2014050266A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IN1578DEN2015 IN2015DN01578A (enExample) 2012-09-26 2013-07-18
DE112013004715.2T DE112013004715T5 (de) 2012-09-26 2013-07-18 Kraftstoffeinspritzventil
CN201380037949.2A CN104471235A (zh) 2012-09-26 2013-07-18 燃料喷射阀

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012-211779 2012-09-26
JP2012211779A JP2014066175A (ja) 2012-09-26 2012-09-26 燃料噴射弁

Publications (1)

Publication Number Publication Date
WO2014050266A1 true WO2014050266A1 (ja) 2014-04-03

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ID=50387680

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Application Number Title Priority Date Filing Date
PCT/JP2013/069547 Ceased WO2014050266A1 (ja) 2012-09-26 2013-07-18 燃料噴射弁

Country Status (5)

Country Link
JP (1) JP2014066175A (enExample)
CN (1) CN104471235A (enExample)
DE (1) DE112013004715T5 (enExample)
IN (1) IN2015DN01578A (enExample)
WO (1) WO2014050266A1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111279066A (zh) * 2017-11-01 2020-06-12 三菱电机株式会社 燃料喷射阀

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6416564B2 (ja) * 2014-09-18 2018-10-31 日立オートモティブシステムズ株式会社 燃料噴射弁

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06305145A (ja) * 1993-04-27 1994-11-01 Ricoh Co Ltd サーマルインクジェットヘッド
JP2002098028A (ja) * 2000-09-06 2002-04-05 Visteon Global Technologies Inc 燃料噴射器用ノズル
JP2002250258A (ja) * 2001-02-22 2002-09-06 Denso Corp 燃料噴射装置用定残圧弁
JP2010167775A (ja) * 2008-12-24 2010-08-05 Seiko Epson Corp 液体容器
JP2012154264A (ja) * 2011-01-27 2012-08-16 Hitachi Automotive Systems Ltd 燃料噴射弁

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5435884A (en) * 1993-09-30 1995-07-25 Parker-Hannifin Corporation Spray nozzle and method of manufacturing same
CN201982196U (zh) * 2010-12-31 2011-09-21 浙江新柴股份有限公司 一种直喷柴油机的高效低排放燃烧装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06305145A (ja) * 1993-04-27 1994-11-01 Ricoh Co Ltd サーマルインクジェットヘッド
JP2002098028A (ja) * 2000-09-06 2002-04-05 Visteon Global Technologies Inc 燃料噴射器用ノズル
JP2002250258A (ja) * 2001-02-22 2002-09-06 Denso Corp 燃料噴射装置用定残圧弁
JP2010167775A (ja) * 2008-12-24 2010-08-05 Seiko Epson Corp 液体容器
JP2012154264A (ja) * 2011-01-27 2012-08-16 Hitachi Automotive Systems Ltd 燃料噴射弁

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111279066A (zh) * 2017-11-01 2020-06-12 三菱电机株式会社 燃料喷射阀
CN111279066B (zh) * 2017-11-01 2022-03-01 三菱电机株式会社 燃料喷射阀

Also Published As

Publication number Publication date
CN104471235A (zh) 2015-03-25
IN2015DN01578A (enExample) 2015-07-03
DE112013004715T5 (de) 2015-07-16
JP2014066175A (ja) 2014-04-17

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