WO2023228411A1 - Soupape d'injection de carburant électromagnétique - Google Patents

Soupape d'injection de carburant électromagnétique Download PDF

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Publication number
WO2023228411A1
WO2023228411A1 PCT/JP2022/021756 JP2022021756W WO2023228411A1 WO 2023228411 A1 WO2023228411 A1 WO 2023228411A1 JP 2022021756 W JP2022021756 W JP 2022021756W WO 2023228411 A1 WO2023228411 A1 WO 2023228411A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
valve
coil housing
fuel injection
electromagnetic fuel
Prior art date
Application number
PCT/JP2022/021756
Other languages
English (en)
Japanese (ja)
Inventor
雄大 三浦
正美 菊地
和彌 村上
勇輝 堀
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
Priority to PCT/JP2022/021756 priority Critical patent/WO2023228411A1/fr
Publication of WO2023228411A1 publication Critical patent/WO2023228411A1/fr

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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
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures

Definitions

  • the present invention relates to an electromagnetic fuel injection valve in which a movable core is driven by controlling the energization of a coil on the outer periphery of a fixed core to repeatedly open and close the valve.
  • a movable core that faces a fixed core and interlocks with a valve body, a coil housing that functions as a yoke that surrounds a coil provided on the outer periphery of the fixed core and forms a magnetic circuit passing through the fixed core and the movable core;
  • the electromagnetic fuel injection valve is equipped with a resin filled between a coil housing and a coil, and the movable core and valve body are integrally driven by controlling the energization of the coil, and the valve repeats an open state and a closed state. known (for example, see Patent Document 1).
  • the coil housing includes two yokes arranged on both sides in the radial direction with the coil in between.
  • Each yoke includes a partially cylindrical large diameter portion whose inner surface faces the cylindrical side surface of the coil and whose center angle is obtuse.
  • a recessed portion is formed in the large diameter portion. Further, the recessed portion of the large diameter portion is provided with a filling hole that penetrates the recessed portion.
  • the space between the coil housing and the coil is filled with resin when the coating layer that covers the main part of the electromagnetic fuel injection valve, including the coil housing, is injection molded as an insert part. That is, at this time, the space between the two yokes serves as a filling port, and the space is filled with resin. Filling is also performed through the filling hole.
  • the above-mentioned recesses and filling holes have a function of increasing the ability to fill the space with resin. This makes it possible to injection mold the coating layer at lower pressure or in a shorter time, improving production efficiency.
  • a recessed portion is provided in the large diameter portion of the yoke constituting the magnetic circuit, but this measure reduces performance and reduces yield due to injection molding. This is not necessarily appropriate from the perspective of promoting downsizing while avoiding deterioration. That is, although the recessed portion improves the filling property of the resin, there is a risk that it may adversely affect the magnetic path in the yoke, resulting in a decrease in performance or an increase in the diameter of the yoke.
  • an object of the present invention is to provide an electromagnetic fuel injection valve that can ensure good performance and promote miniaturization while avoiding deterioration in yield caused by injection molding. be.
  • the electromagnetic fuel injection valve of the present invention includes: fixed core; a movable core facing the fixed core; a valve body interlocking with the movable core; a coil provided on the outer periphery of the fixed core; a coil housing surrounding the coil and forming a magnetic circuit passing through the fixed core and the movable core; a resin filled between the coil and the coil housing;
  • the coil housing includes a pair of coil housing halves arranged on both sides in the radial direction with the coil sandwiched therebetween, Each coil housing half includes a partial cylindrical portion whose inner surface faces the cylindrical side surface of the coil and whose central angle is obtuse;
  • the partial cylindrical portion of each coil housing half is characterized in that two communication holes having a predetermined diameter and passing through in the radial direction are provided at a predetermined interval in the axial direction.
  • the resin filling for molding the insulating part between the coil housing and the coil is performed by injection molding the main parts including the coil housing of the electromagnetic fuel injection valve as insert parts and the coating layer covering the main parts. Sometimes they can be done at the same time. At this time, the space between the two coil housing halves and the two communication holes serve as ports for filling the resin between the coil housing and the coil.
  • the two communication holes also serve as resin filling ports, which increases the flow rate of resin from the outside to the inside of the coil housing half, and prevents welds from forming at both ends of the coil. can. This prevents the weld from causing disturbance in the windings at both ends of the coil, thereby improving yield.
  • This improvement in yield can be achieved by simply providing two communication holes in the coil housing halves that make up the magnetic circuit, minimizing changes in the cross-sectional area of the coil housing halves, and increasing the diameter of the coil housing. It is achieved without any trouble. Therefore, according to the present invention, it is possible to provide an electromagnetic fuel injection valve that can ensure good performance and promote downsizing while achieving an improvement in yield.
  • the thickness of the coil housing half may be constant. According to this, it is possible to prevent the magnetic force between the fixed core and the movable core from decreasing due to the magnetic flux being restricted by the portions of the coil housing halves with non-uniform thickness.
  • the diameter of the opening on the coil side of each communication hole may be larger than the diameter of the opening on the opposite side. According to this, when resin is filled from the outside of the coil housing half through the communication hole during injection molding of the coating layer of the electromagnetic fuel injection valve, the resin is poured into the coil housing from the opening on the coil side of the communication hole. Since it is well diffused inside the half body, it is possible to more effectively suppress the occurrence of welds at both ends of the coil.
  • FIG. 1 is a sectional view showing an electromagnetic fuel injection valve according to an embodiment of the present invention.
  • FIG. 2 is an enlarged cross-sectional view of a part of the coil assembly in the electromagnetic fuel injection valve of FIG. 1.
  • FIG. FIG. 2 is a perspective view showing a half coil housing in the electromagnetic fuel injection valve of FIG. 1.
  • FIG. 7 is a diagram showing resin flow analysis results regarding the occurrence of welds when resin is filled between the coil housing and the coil in the case where the coil housing half has no communication hole. It is a figure which shows the resin flow analysis result regarding the generation
  • FIG. 1 shows an electromagnetic fuel injection valve according to an embodiment of the present invention.
  • this electromagnetic fuel injection valve 1 includes a fixed core 2, a movable core 3 facing the fixed core 2, a valve body 4 interlocking with the movable core 3, and a valve body 4 provided on the outer periphery of the fixed core 2. It includes a coil 5, a coil housing 6 that surrounds the coil 5 and forms a magnetic circuit passing through the fixed core 2 and the movable core 3, and a resin 7 filled between the coil 5 and the coil housing 6.
  • the electromagnetic fuel injection valve 1 drives the movable core 3 and the valve body 4 by controlling the energization to the coil 5, thereby repeating the valve open state and the valve closed state.
  • the valve housing 8 of the electromagnetic fuel injection valve 1 includes a cylindrical valve seat member 9, a magnetic cylindrical body 10 that fits onto the outer peripheral surface of the rear end of the valve seat member 9 and is welded liquid-tightly, and a magnetic cylinder.
  • a non-magnetic cylindrical body 11 is abutted against the rear end of the body 10 and welded in a liquid-tight manner, and a hollow cylinder is welded in a liquid-tight manner by fitting the small-diameter front end onto the inner peripheral surface of the non-magnetic cylindrical body 11.
  • the fuel inlet tube 12 is composed of the above-mentioned fixed core 2 having a shape, and a fuel inlet cylinder 12 that is fitted onto the outer periphery of the rear end of the fixed core 2 and welded in a liquid-tight manner.
  • the valve seat member 9 has a valve hole 13 opening on its front end surface, a conical valve seat 14 connected to the inner peripheral end of the valve hole 13, and a cylindrical guide hole 15 connected to the large diameter portion of the valve seat 14. has.
  • An injector plate 16 made of a steel plate and having a plurality of fuel injection holes communicating with the valve hole 13 is welded to the front end surface of the valve seat member 9 in a liquid-tight manner.
  • a portion that does not fit with the fixed core 2 is left at the front end of the non-magnetic cylindrical body 11, and the above-mentioned hollow cylindrical movable core 3 extends from that portion to the magnetic cylindrical body 10 and faces the front end surface of the fixed core 2. is fitted, and the valve body 4 is connected to the movable core 3.
  • the hollow cylindrical fixed core 2 and movable core 3 are thicker than the magnetic cylindrical body 10 and the non-magnetic cylindrical body 11.
  • the valve element 4 includes a spherical valve part 17 that can slide through the guide hole 15 to open and close the valve hole 13 in cooperation with the valve seat 14, and a valve rod 18 whose front end is fixed to the valve part 17.
  • the rear end of the valve rod 18 is press-fitted into the inner peripheral surface of the movable core 3 and welded. Therefore, the valve body 4 can move up and down within the valve housing 8 integrally with the movable core 3.
  • the valve rod 18 is made of a pipe material with a slot 19, and the inside thereof communicates with the hollow part of the movable core 3, and the inside and outside of the valve rod 18 communicate with each other via the slot 19. Further, a plurality of flat surfaces are formed around the spherical valve portion 17 to allow passage of fuel.
  • the fuel inlet cylinder 12, the fixed core 2, the retainer 20 (described later), the movable core 3, and each hollow part of the valve rod 18, the slot 19 of the valve rod 18, the guide hole 15 of the valve seat member 9, and the valve hole 13. , and the fuel injection holes of the injector plate 16 constitute a series of fuel flow paths F within the valve housing 8.
  • a retainer 20 made of a slotted pipe material is press-fitted and fixed in the hollow part of the fixed core 2 at its intermediate part, and its front end becomes a first spring seat.
  • the rear end of the valve rod 18 ends midway in the hollow part of the movable core 3, and its upper end becomes a second spring seat.
  • a valve spring 21 is compressed between the first spring seat and the second spring seat. The set load of the valve spring 21 urges the movable core 3 downwardly away from the fixed core 2, that is, in the direction in which the valve body 4 is seated on the valve seat 14. The set load of the valve spring 21 is adjusted by the depth of engagement of the retainer 20 into the fixed core 2.
  • a ring-shaped stopper member 22 made of a non-magnetic material is embedded in the inner peripheral surface of the movable core 3 and slightly protrudes from the rear end surface.
  • a coil assembly 23 is fitted around the outer periphery of the valve housing 8 in correspondence with the fixed core 2 and the movable core 3.
  • the coil assembly 23 consists of a synthetic resin bobbin 24 that extends from the rear end of the magnetic cylindrical body 10 to the fixed core 2 and is fitted onto the outer peripheral surface thereof, and the above-mentioned coil 5 that is wound around the bobbin 24. .
  • a terminal support arm 26 is integrally formed at the rear end of the bobbin 24 to support the base end of the power supply terminal 25 protruding to one side thereof.
  • the terminal of the coil 5 is connected to the power supply terminal 25 .
  • the coil assembly 23 is covered approximately half its circumferential surface with the above-mentioned coil housing (yoke) 6.
  • a synthetic resin coating layer 27 is injection molded from the magnetic cylindrical body 10 to the fuel inlet cylinder 12, covering the outer peripheral surfaces thereof and embedding the coil assembly 23. At this time, a coupler 28 that accommodates and holds the power supply terminal 25 and projects to one side of the coil assembly 23 is integrally molded with the covering layer 27.
  • the above-mentioned resin 7 filled between the coil 5 and the coil housing 6 is formed as part of the covering layer 27.
  • a fuel filter 29 is attached to the inlet of the fuel inlet cylinder 12. Further, a fuel cap connected to a fuel pump (not shown) is fitted onto the outer periphery of the upper end of the fuel inlet cylinder 12 via a seal member 30.
  • FIG. 2 shows an enlarged view of the vicinity of the coil assembly 23.
  • the coil housing 6 is composed of a pair of coil housing halves 31 arranged on both sides in the radial direction with the coil assembly 23 in between.
  • the above-mentioned resin 7 is filled between the coil 5 and the coil housing half 31 to form an insulating portion therebetween.
  • FIG. 3 shows the coil housing half 31.
  • the coil housing half 31 includes a partial cylindrical portion 32 whose inner surface faces the cylindrical side surface of the coil and whose central angle ⁇ is an obtuse angle. For example, 145° can be adopted as the central angle.
  • the thickness t of the coil housing half 31 is constant. For example, 1 mm is adopted as the thickness t.
  • the partial cylindrical portion 32 has two communication holes 33 that penetrate in the radial direction and have a predetermined diameter ⁇ , with a predetermined distance d in the axial direction, and a center point between them.
  • the position is located at the center of the partial cylindrical portion 32.
  • 2 mm is adopted as the predetermined diameter ⁇ .
  • 8.4 mm is adopted as the predetermined interval d. .
  • the resin is filled between the coil housing 6 and the coil 5 at the same time as the coating layer 27 is injection molded.
  • This injection molding is performed using the main parts of the electromagnetic fuel injection valve 1, including the assembled coil housing 6, valve housing 8, power supply terminal 25, etc., as insert parts.
  • the space between the two coil housing halves 31 and the two communication holes 33 serve as resin filling ports.
  • the valve portion 17 is pressed toward the tip by the valve spring 21, and the valve portion 17 is pressed toward the distal end by the valve spring 21, and the valve portion 17 is closed when seated on the valve seat 14. It is in a valve state. In this state, when fuel is force-fed from a fuel pump (not shown) to the fuel inlet cylinder 12 via the fuel distribution pipe, the fuel fills the fuel flow path F in the valve housing 8 and further flows toward the valve portion 17. Apply fluid pressure.
  • valve portion 17 is removed from the valve seat 14, and the electromagnetic fuel injection valve 1 is placed in an open state.
  • the high-pressure fuel in the fuel flow path F is injected into the intake pipe of the internal combustion engine in the form of mist from the fuel nozzle of the injector plate 16 through the valve hole 13. Then, when the coil 5 is de-energized, the valve portion 17 returns to the closed state in which it is seated on the valve seat 14.
  • the electromagnetic fuel injection valve 1 repeats a closed state and an open state, thereby appropriately supplying fuel to the internal combustion engine to which the electromagnetic fuel injection valve 1 is attached. I can do it.
  • the two communication holes 33 are provided in the coil housing half body 31, the negative influence on the magnetic circuit in the coil housing half body 31 can be minimized, and the coil housing 6 Yield is improved without increasing the diameter. Therefore, it is possible to provide an electromagnetic fuel injection valve that can ensure good performance and promote miniaturization while improving yield.
  • the resin is filled between the coil housing 6 and the coil 5 when the coating layer 27 is formed of resin by injection molding using the main parts of the electromagnetic fuel injection valve 1 including the coil housing 6 etc. as insert parts. Can be done concurrently.
  • the space between the two coil housing halves 31 and the respective two communication holes 33 serve as ports for filling the space between the coil housing 6 and the coil 5 with the resin.
  • This improvement in yield can be achieved by simply providing two communication holes 33 in the coil housing half 31 without providing any recesses or the like. Therefore, it is possible to avoid increasing the diameter of the coil housing 6 while minimizing the adverse effect on the magnetic circuit in the coil housing half 31.
  • 4A to 4D are diagrams showing resin flow analysis results for explaining the effects of these two communication holes 33.
  • 4A to 4D show how a weld 34 occurs when resin is filled between the coil housing 6 and the coil 5 when injection molding the above-mentioned coating layer 27.
  • the occurrence status of this weld 34 is shown as "0" (absent), "1", and “2" (in this embodiment, the number of communication holes 33 provided in the coil housing half 31). ), and “3”.
  • the magnetic flux is restricted in the portions of the coil housing half body where the thickness is uneven, so that the fixed core 2 and the movable core 3 can be prevented from decreasing.
  • the present invention is not limited thereto.
  • the diameter of the opening on the coil 5 side may be larger than the diameter of the opening on the opposite side. According to this, when the resin is filled from the outside of the coil housing half body 31 through the communication hole 33, the resin diffuses well from the communication hole 33 into the inside of the coil housing half body 31, so that the weld 34 is This can be more effectively suppressed from occurring at both ends of the coil 5.
  • Electromagnetic fuel injection valve 2... Fixed core, 3... Movable core, 4... Valve body, 5... Coil, 6... Coil housing, 7... Resin, 8... Valve housing, 9... Valve seat member, 10... Magnetism Cylindrical body, 11... Non-magnetic cylindrical body, 12... Fuel inlet cylinder, 13... Valve hole, 14... Valve seat, 15... Guide hole, 16... Injector plate, 17... Valve part, 18... Valve rod, 19... Slot , 20... retainer, 21... valve spring, 22... stopper member, 23... coil assembly, 24... bobbin, 25... power supply terminal, 26... terminal support arm, 27... coating layer, 28... coupler, 29... fuel filter, 30... Seal member, 31... Coil housing half, 32... Partial cylindrical part, 33... Communication hole, 34... Weld, 35... Both ends, F... Fuel flow path.

Abstract

La présente invention concerne une soupape d'injection de carburant électromagnétique qui permet de garantir de bonnes performances et de faciliter la réduction de la taille tout en évitant la détérioration du rendement. Une soupape d'injection de carburant électromagnétique (1) comprend un boîtier de bobine (6) entourant une bobine (5) disposée autour de la périphérie externe d'un noyau fixe (2), et une résine (7) introduite entre la bobine (5) et le boîtier de bobine (6). Le boîtier de bobine (6) comprend une paire de moitiés de boîtier de bobine (31) ayant chacune une partie cylindrique partielle (32). Deux trous de communication (33) ayant un diamètre prédéterminé φ et pénétrant dans le sens radial sont prévus dans les parties cylindriques (32) avec un espace prédéterminé d dans le sens axial.
PCT/JP2022/021756 2022-05-27 2022-05-27 Soupape d'injection de carburant électromagnétique WO2023228411A1 (fr)

Priority Applications (1)

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PCT/JP2022/021756 WO2023228411A1 (fr) 2022-05-27 2022-05-27 Soupape d'injection de carburant électromagnétique

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Application Number Priority Date Filing Date Title
PCT/JP2022/021756 WO2023228411A1 (fr) 2022-05-27 2022-05-27 Soupape d'injection de carburant électromagnétique

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009208389A (ja) * 2008-03-05 2009-09-17 Nagoya City ポリ乳酸系樹脂成形体およびその成形方法
JP2011047161A (ja) * 2009-08-26 2011-03-10 Nifco Inc ガラスホルダー
JP2014125972A (ja) * 2012-12-26 2014-07-07 Denso Corp 燃料噴射弁
JP5546667B1 (ja) * 2013-05-08 2014-07-09 三菱電機株式会社 燃料噴射弁
JP2017126756A (ja) * 2017-01-30 2017-07-20 ダイキョーニシカワ株式会社 樹脂成形品
JP2018154102A (ja) * 2017-03-21 2018-10-04 キヤノン株式会社 成形品の製造方法、成形品、カートリッジ及び画像形成装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009208389A (ja) * 2008-03-05 2009-09-17 Nagoya City ポリ乳酸系樹脂成形体およびその成形方法
JP2011047161A (ja) * 2009-08-26 2011-03-10 Nifco Inc ガラスホルダー
JP2014125972A (ja) * 2012-12-26 2014-07-07 Denso Corp 燃料噴射弁
JP5546667B1 (ja) * 2013-05-08 2014-07-09 三菱電機株式会社 燃料噴射弁
JP2017126756A (ja) * 2017-01-30 2017-07-20 ダイキョーニシカワ株式会社 樹脂成形品
JP2018154102A (ja) * 2017-03-21 2018-10-04 キヤノン株式会社 成形品の製造方法、成形品、カートリッジ及び画像形成装置

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