GB2593498A - Fuel injector with optimized coil housing - Google Patents

Fuel injector with optimized coil housing Download PDF

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Publication number
GB2593498A
GB2593498A GB2004299.0A GB202004299A GB2593498A GB 2593498 A GB2593498 A GB 2593498A GB 202004299 A GB202004299 A GB 202004299A GB 2593498 A GB2593498 A GB 2593498A
Authority
GB
United Kingdom
Prior art keywords
injector
needle
fuel
coil
bore
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.)
Granted
Application number
GB2004299.0A
Other versions
GB202004299D0 (en
GB2593498B (en
Inventor
Heise Volker
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.)
BorgWarner Luxembourg Automotive Systems SA
Original Assignee
Delphi Automotive Systems Luxembourg SA
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 Delphi Automotive Systems Luxembourg SA filed Critical Delphi Automotive Systems Luxembourg SA
Priority to GB2004299.0A priority Critical patent/GB2593498B/en
Publication of GB202004299D0 publication Critical patent/GB202004299D0/en
Publication of GB2593498A publication Critical patent/GB2593498A/en
Application granted granted Critical
Publication of GB2593498B publication Critical patent/GB2593498B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0019—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of electromagnets or fixed armatures
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A fuel injector (10, fig 1), for an internal combustion engine, comprising a cartridge provided with a body (12, fig 1) with a bore (16, fig 1), a fuel inlet (18, fig 1) and a fuel outlet (20, fig 1). A needle (14, fig 1) extends from a head (22, fig 1) to a tip (24, fig 1), and reciprocates in the bore along a longitudinal axis from a closed position, in which the tip of the needle closes the fuel outlet, to an open position, in which the tip of the needle is spaced apart from the fuel outlet. A magnetic armature (40, fig 1) is arranged to move along an axis according to a magnetic field, the movement of the armature controlling the reciprocating of the needle in the bore. The fuel injector has a coil (42, fig 2) that generates the magnetic field to control the movement of the magnetic armature. A coil housing (44) comprises an assembly of two joined half shells (46, 48).

Description

FUEL INJECTOR WITH OPTIMIZED COIL HOUSING
TECHNICAL FIELD
The present invention relates to a fuel injector for an internal combustion engine with an optimized coil housing.
BACKGROUND OF THE INVENTION
It is known that current injectors comprise coil housings that are deep drawn or stamped cylindrical metal cages that serve conducting magnetic flux and protecting coil winding from environmental damage. The subassembly is either designed such that it is welded to a cartridge of the injector and thereafter over molded onto the injector or over molded such that a separate coil assembly is created. Such a separate coil assembly is eventually mounted onto the cartridge assembly and welded onto it.
It is of major importance for injectors to have an injector coil such that least variations originate from the chain from drive-current to force at the interface. This implies to have by design least parasitic permeability discontinuities of small magnitude. However, the known designs do not give satisfaction.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above-mentioned problem in providing a fuel injector for an internal combustion engine, said injector comprising a cartridge provided with a body and a needle, the body being provided with a bore extending along a longitudinal axis, and comprising a fuel inlet and a fuel outlet, the needle extending from a head to a tip, and being configured to reciprocate in the bore along said longitudinal axis from a closed position to an open position, such that, in the closed position, the tip of the needle closes the fuel outlet, and, in the open position, the tip of the needle is spaced apart from the fuel outlet, a magnetic armature arranged to move along an axis according to a magnetic field, the movement of the armature controlling the reciprocating of the needle in the bore, the fuel injector further comprising a coil housing and a coil, the coil being arranged to generate the magnetic field to control the movement of the magnetic armature, wherein the coil housing is an assembly of two joined half shells.
Thanks to the claimed injector, the gaps that could exist in the coil housing are drastically reduced, which minimizes parasitic permeability discontinuities and consequently improves the functioning of the injector.
The coil housing assembly may present a general cylindrical shape, each of the two half shells presenting a half cylindrical shape.
Each of the two half shells may be delimited by an external surface extending between two ends, each end forming an axial connection of the shells and extending along a longitudinal axis of the coil housing assembly.
The two half shells may be welded onto the cartridge along their axial connections.
The overmold may comprise an electric part to operate the injector.
The injector may comprise at least one element arranged to hold the half shells one against the other, said one element being chosen between a clip, a spring and a supplementary welding.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with 20 reference to the accompanying drawings in which: Figure 1 is a partial longitudinal view of a fuel injector as per the present invention.
Figure 2 is a perspective view of the fuel injector of figure 1, an overmold not being illustrated.
Figure 3 is a perspective view of a cartridge of the fuel injector of figure Figure 4 is a perspective view of the fuel injector of figure 2, an overmold being illustrated Figure 5 is a perspective view of a detail of figure 2 Figure 6 is a perspective view of a coil housing assembly as per the present invention.
Figure 7 is a perspective view of a half shell of the coil housing assembly of figure 6.
Figure 8 shows a detail of the fuel injector of figure 2.
Figures 9, 10 and 11 show detail of alternative embodiments of the fuel injector of figure 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
As can be seen from figure I, a fuel injector 10 for an internal combustion engine comprises a cartridge 100 provided with a body 12 and a needle 14. The body 12 comprises an elongated bore 16 extending longitudinally along a longitudinal axis, the bore 16 being provided with a fuel inlet 18 and a fuel outlet 20.
As also shown in figure 1, the needle extends from a head 22 to a tip 24 and is arranged to reciprocate in the bore 16 along the longitudinal axis X from a closed position to an open position.
In the closed position, the tip 24 of the needle 14 closes the fuel outlet 20, and, in the open position, the tip 24 of the needle 14 is spaced apart from the fuel outlet 20.
The injector 10 also comprises a control chamber 26 arranged to control the reciprocating of the needle 14 in the bore 16 via a valve assembly 28 that controls the pressure of the fuel in the control chamber 26.
As illustrated in figure 1, the valve assembly 28 comprises a valve body and a rod 32.
The valve body 30 is provided with an elongated bore 34 extending along a longitudinal axis L preferably parallel to the longitudinal axis X of the injector bore 16 The valve body 30 also comprises a fuel entrance channel 36 and a fuel seat 38.
As can be seen from figure 1, the channel 36 is arranged to lead fuel from the control chamber 26 to the valve assembly 34. As particularly seen from figures 1 and 3, the channel 26 ends in the valve assembly 28 in a first annular groove 39 protruding from the valve body 30.
The rod 32 extends along the longitudinal axis L in the bore 34 to reciprocate between a closed position and an open position, such that the reciprocating of the rod 32 controls the fuel charge and discharge in the control chamber 26.
The valve assembly 28 also comprises a magnetic armature 40 fixed to the rod 32 and arranged to cooperate with a magnetic coil in a coil housing assembly that will be detailed later. When the coil is supplied with electrical current, the armature 40 lifts in the bore 34 and fuel flows from the fuel exit 38 to the fuel tank. The fuel pressure in the control chamber quickly reduces and this discharge leads to the lifting of the needle 14 in the bore 16, opening the fuel outlet 20. When is the coil is not supplied with electrical current, a spring (not illustrated) reinstate the sealing in the actuator, which closes the fuel outlet 20.
As already noted, the fuel injector further comprises a coil 42 that is arranged to generate the magnetic field to control the movement of the magnetic armature 40. The coil 42 is housed in a coil housing assembly 44 composed of two joined half shells 46, 48.
Such a configuration prevents the formation of gaps in the coil housing are drastically reduced, which minimizes parasitic permeability discontinuities and consequently improves the functioning of the fuel injector 10.
As best seen from figures 5 to 7, the coil housing assembly 44 presents a general cylindrical shape with a longitudinal axis LL coinciding with the longitudinal axis L of the valve body 30. Each of the two half shells, 46, 48 presents a half cylindrical shape.
The half shell 46 is delimited by an external surface 50 extending between two opposed end walls 52, 54, each end wall 52, 54 forming an axial connection of the half shells extending along the longitudinal axis L. The external surface 50 comprises an inner portion 56 configured so as to receive the coil 42.
Similarly, the half shell 48 is delimited by an external surface 58 extending between two opposed end walls 60, 62, each end wall 60, 62 forming an axial connection of the half shells extending along the longitudinal axis L. The external surface 58 comprises an inner portion 64 configured so as to receive the coil 42 The two half shells 46, 48 are preferably welded onto the cartridge 100 along their axial connections 52, 60 and 54, 62, respectively.
As can be seen from figures 4 and 5, the injector 10 also comprises an electric part 64 to operate the fuel injector 10.
As shown on figure 8, the cartridge 100 comprises a cavity or rip 66 while the half shell 46, 48 comprises a protuberance 68 shaped to penetrate the cavity 66 to locate the coil relatively to the cartridge body.
Advantageously, the fuel injector 10 further comprises at least one element arranged to hold the half shells one against the other, said one element being chosen between a spring clip 70, and a supplementary welding 72, as shown on figures 9 to 11.
The spring clip 70 illustrated in figures 9 to 11 ensures to hold the half shell onto the coil overmold. The pre-loading of the spring clip 70 also guarantees to force flux interfaces with minimum gaps.
The supplementary welding 72 is particularly appropriate when tighter inductance tolerances are needed, either by welding the metal spring to the associated half shell or welding a lower end of the half shell onto the cartridge.
The alternative illustrated in figure 11 shows the usage of half-shells with reduced circumference section to the cartridge, which eases unloading the half-shells during a stamping step of a process for manufacturing the fuel injector 10 Please note that the fuel injector of figure 1 is only an example to which the two half shells coil housing assembly can be applied.
The fuel injector is preferably a gasoline injector.
LIST OF REFERENCES
X longitudinal axis of fuel injector longitudinal axis of valve body LL longitudinal axis of coil housing assembly fuel injector cartridge 12 body 14 needle 16 bore 18 fuel inlet fuel outlet 22 head 24 tip 26 control chamber 28 valve assembly valve body 32 rod 34 bore of valve assembly 36 fuel entrance channel 38 fuel seat magnetic armature 42 coil 44 coil housing assembly 46,48 half shell external surface of half shell 46 52, 54 axial connections of half shell 46 58 external surface of half shell 48 60, 62 axial connections of half shell 48 64 electric part 66 cavity 68 protuberance

Claims (6)

  1. CLAIMS: Fuel injector (10) for an internal combustion engine, said injector (10) comprising a cartridge provided with: - a body (12) and a needle (14), the body (12) being provided with a bore (16) extending along a longitudinal axis (X), and comprising a fuel inlet (18) and a fuel outlet (20), - the needle (14) extending from a head (22) to a tip (24), and being configured to reciprocate in the bore (16) along said longitudinal axis (X) from a closed position to an open position, such that, in the closed position, the tip (24) of the needle (14) closes the fuel outlet (20), and, in the open position, the tip (24) of the needle (14) is spaced apart from the fuel outlet (20), - a magnetic armature (40) arranged to move along an axis according to a magnetic field, the movement of the armature controlling the reciprocating of the needle (14) in the bore (16), the fuel injector (10) further comprising a coil housing (44) and a coil (42), the coil being arranged to generate the magnetic field to control the movement of the magnetic armature (40), wherein the coil housing (44) consists of an assembly of two joined half shells (46, 48).
  2. 2 The injector as per claim 1, wherein the coil housing assembly (44) presents a general cylindrical shape, each of the two half shells (46, 48) presenting a half cylindrical shape
  3. 3 The injector as per claim 2, wherein each of the two half shells (46, 48) is delimited by an external surface (50, 58) extending between two ends (52, 54, 60, 62), each end forming an axial connection of the half shell and extending along a longitudinal axis (LL) of the coil housing assembly (44).
  4. 4. The injector as per anyone of claims 3, wherein the two half shells (46, 48) are welded onto the cartridge (100) along their axial connections (52, 54, 60, 62).
  5. 5. The injector as per claim 4, wherein the overmold comprises an electric part (64) to operate the injector.
  6. 6 The injector as per anyone of the preceding claims, further comprising at least one element arranged to hold the half shells one against the other, said one element being chosen between a spring clip (70) and a supplementary welding (72)
GB2004299.0A 2020-03-25 2020-03-25 Fuel injector with optimized coil housing Active GB2593498B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2004299.0A GB2593498B (en) 2020-03-25 2020-03-25 Fuel injector with optimized coil housing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2004299.0A GB2593498B (en) 2020-03-25 2020-03-25 Fuel injector with optimized coil housing

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GB202004299D0 GB202004299D0 (en) 2020-05-06
GB2593498A true GB2593498A (en) 2021-09-29
GB2593498B GB2593498B (en) 2023-12-27

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09228926A (en) * 1996-02-22 1997-09-02 Zexel Corp Solenoid fuel injection valve and its mounting structure
EP2458195A1 (en) * 2009-07-23 2012-05-30 Keihin Corporation Electromagnetic fuel injection valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09228926A (en) * 1996-02-22 1997-09-02 Zexel Corp Solenoid fuel injection valve and its mounting structure
EP2458195A1 (en) * 2009-07-23 2012-05-30 Keihin Corporation Electromagnetic fuel injection valve

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Publication number Publication date
GB202004299D0 (en) 2020-05-06
GB2593498B (en) 2023-12-27

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