EP2172641B1 - Aktuator und Einspritzventil - Google Patents

Aktuator und Einspritzventil Download PDF

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Publication number
EP2172641B1
EP2172641B1 EP08017324.8A EP08017324A EP2172641B1 EP 2172641 B1 EP2172641 B1 EP 2172641B1 EP 08017324 A EP08017324 A EP 08017324A EP 2172641 B1 EP2172641 B1 EP 2172641B1
Authority
EP
European Patent Office
Prior art keywords
armature
actuator
discs
actuator according
separation layers
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.)
Expired - Fee Related
Application number
EP08017324.8A
Other languages
English (en)
French (fr)
Other versions
EP2172641A1 (de
Inventor
Gianbattista Fischetti
Mauro Grandi
Matteo Soriani
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.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP08017324.8A priority Critical patent/EP2172641B1/de
Publication of EP2172641A1 publication Critical patent/EP2172641A1/de
Application granted granted Critical
Publication of EP2172641B1 publication Critical patent/EP2172641B1/de
Expired - Fee Related 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
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • 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
    • H01F7/081—Magnetic constructions
    • 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
    • H01F7/081—Magnetic constructions
    • H01F2007/086—Structural details of the armature

Definitions

  • the invention relates to an actuator and an injection valve with the actuator.
  • Injection valves are in widespread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into a combustion chamber of a cylinder of the internal combustion engine.
  • injection valves are manufactured in various forms in order to satisfy the various needs for the various combustion engines. Therefore, for example, their length, their diameter and also various elements of the injection valves being responsible for the way the fluid is dosed may vary in a wide range.
  • injection valves may accommodate an actuator for actuating a needle of the injection valve, which may, for example, be an electromagnetic actuator.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example, in the range of up to 200 bar and in the case of diesel engines in the range of up to 2000 bar.
  • US 6,390,393 B1 discloses a fuel injecto comprising a valve needle and an armature.
  • the armature is moveable along a longitudinal axis of the fuel injector and is coupled to the valve needle.
  • US 2007/0215827 A1 and DE 20114466U1 disclose an actuator with an armature comprising multiple armature discs stacked on top of eachother.
  • the object of the invention is to create an actuator and an injection valve which facilitate a reliable and precise function.
  • the invention concerns an actuator comprising an actuator-element.
  • the actuator-element is movable along a predetermined axis of the actuator.
  • the actuator comprises an armature, which is axially movable along the predetermined axis and which is mechanically coupled to the actuator-element.
  • the invention is distinguished concerning a first aspect by the armature comprising multiple magnetizable armature discs and one or multiple non-magnetizable separation layers. Each separation layer is disposed between two armature discs. Furthermore, the actuator comprises at least one coil, being operable to magnetically actuate the armature discs to move axially. By using multiple armature discs, a resulting magnetic force acting on the armature, due to the electrical actuation of the at least one coil, is increased compared to armatures made in one piece.
  • the armature discs preferably have ferromagnetic properties and are operable to be magnetically actuated by the coil.
  • the separation layers have diamagnetic properties and are operable to reduce magnetic interactions between the particular armature discs.
  • the multiple armature discs and/or the one or the multiple separation layers are cylindrically shaped. This has the advantage that the armature discs and/or the separation layers can be manufactured very easily.
  • an outer diameter of the separation layers is basically identical to an outer diameter of the armature discs. This reduces magnetic interactions between the particular armature discs.
  • the multiple armature discs are transversally arranged to the axial movement of the armature. This ensures an increased magnetic force acting on the armature of the actuator.
  • each separation layer comprises rubber and/or chrome and/or plastics and/or an adhesive.
  • Materials like rubber, chrome, plastics and adhesive are preferably non-magnetizable. Separation layers made of these materials reduce magnetic interactions between the particular armature discs.
  • the multiple armature discs are agglutinated by the one or multiple separation layers to form the armature.
  • the separation layers may be formed as layers of an adhesive, for example glue, if the adhesive is not non-magnetizable.
  • the multiple armature discs are riveted together with the one or multiple separation layers disposed between them to form the armature.
  • the armature can be manufactured very easily.
  • the one or multiple rivets are made of materials, for example plastics, which have nonmagnetic properties.
  • each armature disc has an axial thickness between 0.9 and 2.0 mm. This has the advantage that the magnetic force acting on the armature of the actuator is specifically high.
  • each separation layer has an axial thickness between 30 and 100 ⁇ m . This significantly reduces magnetic interactions between the particular armature discs.
  • the armature comprises at least four armature discs. This amount of armature discs forming the armature ensures the increased magnetic force acting on the armature of the actuator.
  • the invention is distinguished concerning a second aspect by an injection valve, comprising an injector body with a central longitudinal axis.
  • the injection valve comprises a valve needle which is axially movable at least partially in the injector body.
  • the valve needle prevents a fluid injection in a closing position and permits a fluid injection in further positions.
  • the injection valve comprises an actuator according to the first aspect, whereas the predetermined axis of the actuator relates to the central longitudinal axis of the injector body.
  • the actuator-element of the actuator relates to the valve needle of the injection valve.
  • the armature discs are axially movable at least partially within the injector body.
  • the injection valve comprises for example a coil assembly with a bobbin that retains a coil.
  • the coil of the actuator preferably relates to the coil of the coil assembly.
  • An injection valve 62 ( figure 1 ), that is in particular suitable for dosing fuel to an internal combustion engine, comprises an inlet tube 2, a housing 6 and a valve assembly 60.
  • the valve assembly 60 comprises an injector body 38, which is, for example, part of the housing 6, with a central longitudinal axis L and a first cavity 7.
  • the valve assembly 60 further comprises a valve body 4, which is at least partially disposed within the first cavity 7 of the injector body 38.
  • the valve body 4 takes in a valve needle 10.
  • a recess 16 is provided which further extends to a recess 18 of an armature 12.
  • the armature 12 comprises a first cylindrical portion 32 with a first outer diameter and a second cylindrical portion 34 with a second outer diameter ( figure 2 ). The first outer diameter is greater than the second outer diameter.
  • the first cylindrical portion 32 is mechanically coupled to the valve needle 10 via the second cylindrical portion 34.
  • the first cylindrical portion 32 comprises multiple armature discs 13 with one or multiple separation layers 15 disposed between the armature discs 13.
  • the recess 16 of the inlet tube 2 and/or the recess 18 of the armature 12 take in a bias spring 14.
  • the bias spring 14 rests on a spring seat being formed by a fluid restrictor, for example an anti-bounce disc 20, or being formed by a projection within the recess 18 of the armature 12.
  • the bias spring 14 is mechanically coupled to the valve needle 10.
  • An adjusting tube 22 is provided in the recess 16 of the inlet tube 2.
  • the adjusting tube 22 forms a further seat for the bias spring 14 and may be axially moved during the manufacturing process of the injection valve 62 in order to preload the bias spring 14 in a desired way.
  • valve needle 10 In a closing position of the valve needle 10, it sealingly rests on a valve needle seat 26, by this preventing a fluid flow through at least one injection nozzle 24.
  • the injection nozzle 24 may be, for example, an injection hole. However, it may also be of some other type suitable for dosing fluid.
  • the valve needle seat 26 may be made in one part with the valve body 4 or a separate part from the valve body 4.
  • a lower guide 29 for guiding the valve needle 10 is provided.
  • the lower guide 29 further comprises an orifice for guiding the fluid flow.
  • a fluid inlet portion 42 is provided in the valve body 4 which communicates with a fluid outlet portion 44 which is part of the second cavity 8 near the valve needle seat 28.
  • the injection valve 62 is provided with a coil assembly 40 with a bobbin that retains a coil 36, which is preferably overmolded.
  • the injector body 38, the armature 12 with its multiple armature discs 13, and the inlet tube 2 are forming a magnetic circuit when the coil 36 is electrically actuated.
  • the armature 12 is guided in the armature guide 30 and is supplied with a magnetic force if the coil assembly 40 is electrically actuated, thus resulting in an axial movement of the armature 12, acting against a spring load of the bias spring 14.
  • Figure 2 depicts a section of the injection valve 62 according to figure 1 in a longitudinal section view.
  • the section depicts the armature 12 with its first and second cylindrical portion 32, 34.
  • the armature 12 is axially movable at least partially within the first cavity 7 of the injector body 38.
  • the first cylindrical portion 32 comprises the multiple armature discs 13 and the multiple separation layers 15. Each separation layer 15 is disposed between two armature discs 13.
  • the armature 12 comprises, for example, five armature discs 13, whereas more or less than five armature discs 13 are also possible.
  • the first cylindrical portion 32 of the armature 12 comprises at least four armature discs 13.
  • each armature disc 13 is cylindrically shaped and comprises a central bore.
  • the armature discs 13 are preferably made of stainless steel with ferromagnetic properties. Each armature disc 13 has preferably an axial thickness between 0.9 and 2.0 mm, whereas also other axial thicknesses are possible. Alternatively, the armature 12 may comprise multiple armature discs 13 with each having a different axial thickness compared to the others.
  • the armature 12 comprises four separation layers 15.
  • the multiple separation layers 15 are preferably made of material with diamagnetic properties, for example rubber and/or chrome and/or plastics and/or ceramic, and are applicable to reduce magnetic interactions between the particular armature discs 13.
  • each separation layer 15 is cylindrically shaped and comprises a central bore.
  • the bores of the armature discs 13 and the bores of the separation layers 15 form the recess 18 of the armature 12 ( figure 1 ), in which the bias spring 14 is disposed.
  • Each separation layer 15 has preferably an axial thickness of 30 to 100 ⁇ m , whereas also other axial thicknesses are possible.
  • the multiple armature discs 13 may be separated by multiple separation layers 15 with each having a different axial thickness compared to the others.
  • the multiple armature discs 13 are coupled to each other by preferably using adhesive closure and/or force closure to form the first cylindrical portion 32 of the armature 12.
  • the adhesive closure is preferably realized by agglutinating the armature discs 13 with the separation layers 15.
  • the separation layers 15 can be formed by layers of glue with diamagnetic properties.
  • the force closure is preferably realized by using one or multiple rivets to assemble the multiple armature discs 13 with the multiple separation layers 15 disposed between them.
  • One rivet may, for example, be shaped hollow cylindrically with a central cavity and may be arranged in the central bores of the armature discs 13 and separation layers 15, whereas the central cavity of the rivet form the recess 18 of the armature 12.
  • the multiple armature discs 13 and the multiple separation layers 15 may be assembled as the first cylindrical portion 32 of the armature 12.
  • the coil assembly 40, the multiple armature discs 13 of the first cylindrical portion 32 and the inlet tube 2 form preferably the magnetic circuit moving the armature 12 and the valve needle 10 axially to act against the spring load of the bias spring 14 to open the injection valve 62 for injecting fluid.
  • the using of multiple armature discs 13 forming the armature 12 has the advantage that a resulting magnetic force acting on the armature 12 due to the electrical actuation of the coil 36 is increased compared to armatures made in one piece.
  • the magnetic force increases while a constant current is flowing in the coil 36, resulting in a constant magnetic field acting on the multiple armature discs 13. This results in a decreased actuation response time of the armature 12 and the valve needle 10 after actuating the coil 36.
  • the response time is predetermined, thus resulting in a desired magnetic force, the armature 12 with multiple armature discs 13 can be manufactured with less material compared to armatures made in one piece.
  • the injection needle 10 and the armature 12 with its multiple armature discs 13 and the separation layers 15 and the coil assembly 40 can be identified as an actuator.
  • the injection needle 10 relates to an actuator-element of the actuator, being mechanically coupled to the armature 12.
  • the coil 36 of the coil assembly 40 relates to a coil of the actuator to magnetically actuate the armature with the actuator-element axially along the longitudinal axis L.
  • Such an actuator may also be used in different applications than injection valves.

Landscapes

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

Claims (11)

  1. Aktuator, umfassend
    • ein Aktuatorelement (10), das entlang einer vorbestimmten Achse (L) des Aktuators bewegbar ist,
    • eine Armatur (12), die entlang der vorbestimmten Achse (L) axial bewegbar ist und mit dem Aktuatorelement (10) mechanisch gekoppelt ist, dadurch gekennzeichnet dass
    • die Armatur (12) eine alternierende Folge einer Vielzahl von magnetisierbaren Armaturscheiben (13) und einer Vielzahl von nicht magnetisierbaren Trennschichten (15) umfasst,
    und der Aktuator umfasst
    • mindestens eine Spule (36), die angeordnet ist, die Armaturscheiben (13) magnetisch zu veranlassen, sich axial zu bewegen.
  2. Aktuator gemäß Anspruch 1, wobei die Armaturscheiben (13) und/oder die Trennschichten (15) zylinderförmig sind.
  3. Aktuator gemäß Anspruch 1 oder 2, wobei die Armaturscheiben (13) quer zu der axialen Bewegung der Armatur (12) angeordnet sind.
  4. Aktuator gemäß einem der vorhergehenden Ansprüche, wobei jede Trennschicht (15) Kautschuk und/oder Chrom und/oder Kunststoff und/oder ein keramisches Material umfasst.
  5. Aktuator gemäß einem der vorhergehenden Ansprüche, wobei die Armaturscheiben (13) mit den zwischen ihnen angeordneten Trennschichten (15) verklebt sind, um die Armatur (12) zu bilden.
  6. Aktuator gemäß einem der vorhergehenden Ansprüche, wobei die Armaturscheiben (13) mit den zwischen ihnen angeordneten Trennschichten (15) vernietet sind, um die Armatur (12) zu bilden.
  7. Aktuator gemäß einem der Ansprüche 1 bis 3, wobei die Trennschichten (15) Schichten aus Kleber mit diamagnetischen Eigenschaften sind.
  8. Aktuator gemäß einem der vorhergehenden Ansprüche, wobei jede Armaturscheibe (13) aus rostfreiem Stahl mit ferromagnetischen Eigenschaften hergestellt ist und eine axiale Dicke zwischen 0,9 und 2,0 mm aufweist.
  9. Aktuator gemäß einem der vorhergehenden Ansprüche, wobei jede Trennschicht (15) eine axiale Dicke zwischen 30 und 100 µm hat.
  10. Aktuator gemäß einem der vorhergehenden Ansprüche, wobei die Armatur (12) mindestens vier Armaturscheiben (13) umfasst.
  11. Einspritzventil (62), umfassend
    • einen Injektorkörper (38) mit einer mittigen Lämgsachse (L),
    • eine Ventilnadel (10), welche mindestens teilweise in dem Injektorkörper (38) axial beweglich ist und eine Fluid-Einspritzung in einer Schließstellung verhindert und die Fluid-Einspritzung in weiteren Stellungen verhindert,
    • einen Aktuator gemäß irgendeinem der Ansprüche 1 bis 10, wobei die vorbestimmte Achse die mittige Längsachse (L) des Injektorkörpers (38) ist, das Aktuatorelement die Ventilnadel (10) ist und die Armaturscheiben (13) mindestens teilweise innerhalb des Injektorkörpers (38) axial beweglich sind.
EP08017324.8A 2008-10-01 2008-10-01 Aktuator und Einspritzventil Expired - Fee Related EP2172641B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08017324.8A EP2172641B1 (de) 2008-10-01 2008-10-01 Aktuator und Einspritzventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08017324.8A EP2172641B1 (de) 2008-10-01 2008-10-01 Aktuator und Einspritzventil

Publications (2)

Publication Number Publication Date
EP2172641A1 EP2172641A1 (de) 2010-04-07
EP2172641B1 true EP2172641B1 (de) 2014-07-23

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Family Applications (1)

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EP08017324.8A Expired - Fee Related EP2172641B1 (de) 2008-10-01 2008-10-01 Aktuator und Einspritzventil

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EP (1) EP2172641B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009047525A1 (de) * 2009-12-04 2011-06-09 Robert Bosch Gmbh Elektromagnetisch betätigbares Ventil
DE102011080693A1 (de) * 2011-08-09 2013-02-14 Robert Bosch Gmbh Magnetanker

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20114466U1 (de) * 2001-09-01 2002-01-03 Eto Magnetic Kg Elektromagnetische Stellvorrichtung
US20070215827A1 (en) * 2004-02-27 2007-09-20 Takashi Kaneko Electromagnetic valve apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6390393B1 (en) 2000-05-03 2002-05-21 Siemens Automotive Corporation Fuel injector having spring seat allowing spring rotation and alignment
FR2810153B1 (fr) * 2000-06-07 2006-09-22 Peugeot Citroen Automobiles Sa Actionneur electromagnetique notamment de soupape de moteur a combustion interne

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20114466U1 (de) * 2001-09-01 2002-01-03 Eto Magnetic Kg Elektromagnetische Stellvorrichtung
US20070215827A1 (en) * 2004-02-27 2007-09-20 Takashi Kaneko Electromagnetic valve apparatus

Also Published As

Publication number Publication date
EP2172641A1 (de) 2010-04-07

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