EP2339596B1 - Séparation magnétique pour une soupape magnétique - Google Patents

Séparation magnétique pour une soupape magnétique Download PDF

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Publication number
EP2339596B1
EP2339596B1 EP10190687A EP10190687A EP2339596B1 EP 2339596 B1 EP2339596 B1 EP 2339596B1 EP 10190687 A EP10190687 A EP 10190687A EP 10190687 A EP10190687 A EP 10190687A EP 2339596 B1 EP2339596 B1 EP 2339596B1
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EP
European Patent Office
Prior art keywords
magnetic
sleeve
valve
thin
radial direction
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.)
Active
Application number
EP10190687A
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German (de)
English (en)
Other versions
EP2339596A1 (fr
Inventor
Georg Kurz
Sebastian Jansen
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2339596A1 publication Critical patent/EP2339596A1/fr
Application granted granted Critical
Publication of EP2339596B1 publication Critical patent/EP2339596B1/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
    • 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
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • 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
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9023—Fibrous materials
    • 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
    • H01F2007/085—Yoke or polar piece between coil bobbin and armature having a gap, e.g. filled with nonmagnetic material

Definitions

  • the invention relates to a solenoid valve according to the preamble of claim 1 or, of a method for producing a solenoid valve according to the preamble of claim. 7
  • a magnetic coil used for generating a magnetic field outside a region through which a fluid, in particular a fuel, flows. This facilitates assembly and prevents, for example, damage to the paint layer of the coil wire by fuel.
  • metallic sleeves are used, which seal the fuel-filled valve interior to the coil. To withstand the fuel pressure (eg over 200 bar internal pressure), the sleeve must have a sufficient wall thickness.
  • the magnetic flux from the outside of the sleeve can reach the magnetic circuit components (armature or magnet armature and inner pole or magnetic core) arranged inside as little loss as possible.
  • This requires a soft magnetic sleeve with the highest possible permeability, so good magnetic conductivity.
  • a continuous soft magnetic sleeve has the disadvantage that a portion of the magnetic flux does not pass through as desired inner pole and armature of the magnetic circuit and the air gap arranged therebetween, but remains in the sleeve. The magnetic circuit is thus short-circuited by the sleeve, which leads to a significant reduction in the achievable magnetic force and the dynamics of the power and degradation.
  • magnétique circuit sleeves which have in the region of the armature air gap, ie in the region between armature and inner pole, no or only a small magnetic conductivity and in the zones of radial magnetic flux as good as possible magnetic conductivity.
  • Such a "magnetic separation" can be achieved inter alia by a multi-part construction of the sleeve by an intermediate piece of non-magnetic material between two soft magnetic sleeve parts is arranged.
  • the connection of the elements takes place by different methods such as welding (cf., for example, pamphlets DE 10 2006 014 020 A1 and DE 102 35 644 A1 ) or soldering (pamphlet DE 43 10 719 A1 ).
  • the described methods have different disadvantages.
  • the high cost of joining the parts, checking the tightness and the required post-processing e.g. due to thermal distortion considered unfavorable.
  • the method of local thermal influence of the magnetic properties does not allow complete abolition of the magnetizability of the material, leads to a blurred separation due to the heat affected zone and causes u.U. also a delay of the sleeve.
  • the simplest solution from the production point of view of reducing the wall thickness of the sleeve is, from a functional point of view, a rather unfavorable compromise since, for reasons of strength, a relatively large residual wall thickness is required. This significantly limits the effectiveness of the magnetic separation and thus the performance of the solenoid valve.
  • a solenoid valve is already known as a fuel injection valve having a tubular valve body, wherein in the radial direction within the valve body, a valve needle is arranged and slidably guided. In the radial direction outside the valve body, a magnetic coil is arranged. A magnetic core is part of the tubular valve body. In the radial direction within the valve body, a magnetic armature is arranged axially opposite to the magnetic core, wherein the armature is arranged on the valve needle.
  • the tubular valve body has a small wall thickness in a thin wall region which is arranged between the magnet armature and the magnet coil and serves as a magnetic throttle point.
  • the thin wall region is surrounded by an annular insert which supports the thin wall region in the radial direction.
  • the tubular valve body extends as a one-piece valve inner tube over the entire axial length of the fuel injection valve. Especially in the area of its thin wall area, this large, long, very precisely produced inner valve tube is particularly susceptible to deformations and possibly cracks or complete destruction by kinking or the like.
  • a separate insert is additionally to be attached externally to the valve body, which can be very complex composed of several individual components.
  • the object of the present invention is to provide a low-cost realizable magnetic separation with high efficiency for a magnetic circuit for actuating valves.
  • the magnetic valve according to the invention and the inventive method for producing a solenoid valve according to the independent claims have the advantage over the prior art that is achieved by the small wall thickness of the sleeve in the thin wall region optimum magnetic separation effect, since the remaining cross-sectional area even at relatively small magnetic River is in the state of magnetic saturation. It is also advantageous that the wall thickness can be selected to be comparatively thin, since the wall thickness only takes over the function of the seal and does not have to transmit the circumferential and axial forces resulting from the internal pressure. It is also advantageous that a reliable seal is ensured because the sleeve consists of a continuous component.
  • the solenoid valve according to the invention can also be used in applications with very high internal pressure, since the reinforcing element has a high tensile strength and high rigidity. It is furthermore advantageous that the solenoid valve according to the invention can be realized comparatively inexpensively. Since the sleeve is in one piece, no complex handling, joining and adjustment processes are required. In addition, a leak test is omitted. It is also advantageous that the geometry of the magnetic separation is clearly defined and sharply defined. It is also advantageous that no welding is necessary and thus no thermal distortion occurs, so that can be dispensed with a post.
  • the sleeve is made of a soft magnetic material, more preferably, the sleeve is made of a ferromagnetic material.
  • the thin-wall region comprises an annular groove.
  • the reinforcing element comprises a fiber material.
  • the fiber material By using the fiber material, it is advantageously possible in a simple and cost-effective manner to achieve high strength, in particular with respect to the pressure load in the radial direction in the thin-wall region of the sleeve. It is preferred that the sleeve is wrapped in the thin wall area of high-strength fibers. As a result, a comparatively high strength is advantageously achieved.
  • the reinforcing element comprises a carbon fiber material or a glass fiber material or an aramid fiber material. This makes it possible in a simple and cost-effective manner advantageously to achieve high strength of the thin-wall region with known fiber materials.
  • the fiber material is arranged in a fixing material.
  • the arrangement in a fixing material it is advantageously possible in a simple manner that a displacement of the fibers due to the axial and radial forces occurring during operation of the solenoid valve can be prevented.
  • the fixing material comprises a plastic material, preferably a synthetic resin material.
  • a plastic material preferably a synthetic resin material.
  • the thin-wall region has a wall thickness of at most approximately 0.2 mm, preferably at most approximately 0.1 mm. As a result of this comparatively small wall thickness, optimum magnetic separation and thus prevention of the magnetic short circuit are advantageously possible.
  • Another object of the present invention is a method for producing a solenoid valve.
  • this method according to the invention it is advantageously possible in a simple manner to produce a magnetic valve with optimum magnetic separation.
  • annular groove is introduced into the sleeve for the production of the thin-wall region.
  • the annular groove is preferably introduced by a turning process. Alternatively, other manufacturing methods of the annular groove are possible.
  • the thin-wall region for receiving the radial forces is reinforced with a fiber material. Due to the reinforcement with fiber material an optimal compression strength of the thin wall region can be achieved in a simple manner.
  • the thin wall region is wrapped with a carbon fiber or a glass fiber or an aramid fiber.
  • FIG. 1 schematically shows a part of a solenoid valve 113 according to a first embodiment of the present inventive solenoid valve 113.
  • the solenoid valve 113 is in particular a fuel injection valve (valve needle and return spring are not shown).
  • the solenoid valve is rotationally symmetrical with respect to the axis 112 constructed.
  • a magnetically soft, ie made of a ferromagnetic material, armature 106 (hereinafter also referred to as magnet armature 106) is mounted axially displaceable and is switched on coil 103 (hereinafter also referred to as magnetic coil 103) by the resulting magnetic force of a soft magnetic inner pole 111 (hereinafter also called magnetic core 111) tightened.
  • a valve sleeve 105 (also referred to below as sleeve 105) in the region of the armature air gap 107 is provided with an annular groove 110 (also referred to below as groove 110). Due to the low residual wall thickness 109, this causes a reduction of the cross section, so that the magnetic flux runs almost completely in the armature air gap 107 and not unused in the sleeve 105.
  • the valve sleeve 105 is made of a soft magnetic material in order to conduct the magnetic flux as lossless as possible radially from the inner pole 111 to a magnet pot 102.
  • the valve sleeve 105 also has the task of sealing the interior against the environment.
  • the fuel pressure inside the sleeve 105 is generally much greater than the ambient pressure, so that the sleeve 105 is pressurized and must absorb high radial forces.
  • the sleeve 105 is provided in this area with a winding of high-strength fiber material 108 (for example, from a carbon fiber), which is fixed with a plastic matrix (eg made of synthetic resin).
  • the fiber reinforcement absorbs the circumferential or radial forces resulting from the pressure.
  • the axial tensile force which occurs is in the illustrated first embodiment passed by a magnetic cover 114 and the magnetic pot 102 on the outside of the magnetic separation.
  • Magnetic lid 114 and Magnet pot 102 are connected to each other via a thread 101, so that the power transmission is ensured between these components.
  • FIG. 2 schematically shows a part of a solenoid valve 113 according to a second embodiment of the present inventive solenoid valve 113.
  • the connections between the magnet pot 102 and the sleeve 105 for transmitting the axial force are realized by welded joints 200.
  • the magnetic cover 114 was integrated directly into the valve sleeve 105.
  • FIG. 1 and FIG. 2 are merely examples of a variety of ways to arrange. Alternatively, it is possible, for example, that adhesive or clamping connections between magnet pot 102 and sleeve 105 are used or that a positive connection is used by crimping.
  • FIG. 3 schematically shows a part of a solenoid valve 113 according to a third embodiment of the present inventive solenoid valve 113.
  • Both the axial and the radial forces are absorbed by the fiber composite material in the annular groove 110.
  • the high-strength fibers extend not only in the circumferential direction but also in the axial direction.
  • the annular groove 110 has a profiling of 300, which enables an axially acting positive connection between the matrix of the fiber composite material and the sleeve 105. The force is introduced in this way evenly into the fibers.
  • Figures 4a, 4b, 4c and 4d schematically show a sequence of method steps for producing a sleeve 105 according to a first embodiment of the method according to the invention.
  • the outer contour of the sleeve 105 is first processed ( FIG. 4b ).
  • the annular groove 110 is reinforced by the fiber composite material ( Figure 4c ).
  • the inner contour is processed ( FIG. 4d ).
  • Advantageous in this first embodiment of the method according to the invention is the reinforcement of the sleeve 105 through the fiber winding before the thin residual wall thickness 109 is generated in the region of the magnetic separation. Due to the supporting effect of the fiber composite, the risk of undesired deformation of the sleeve 105 is prevented by the cutting forces.
  • FIG. 5a schematically show a sequence of method steps for producing a sleeve 105 according to a second embodiment of the method according to the invention.
  • FIG. 5a the inner and outer contour of the sleeve 105 are first completed completely ( FIG. 5b ), in the last step, the groove 110 is reinforced by wrapping with fiber material and introducing the matrix material ( FIG. 5c ).
  • This second embodiment of the method according to the invention has the advantage that after the application of the fiber composite no post-processing is required.
  • a support member which may be formed, for example, cylindrical, is inserted into the sleeve 105. This support member provides a radial support during the winding process.

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  • 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)
  • Magnetically Actuated Valves (AREA)

Claims (8)

  1. Électrovanne (113), en particulier soupape d'injection de carburant, comprenant une douille (105), comprenant un pointeau de soupape disposé et guidé de manière déplaçable dans la direction radiale à l'intérieur de la douille (105), comprenant une bobine magnétique (103) disposée dans la direction radiale à l'extérieur de la douille (105), comprenant un noyau magnétique (111) et comprenant une armature magnétique (106) disposée dans la direction radiale à l'intérieur de la douille (105), de manière opposée axialement au noyau magnétique (111), l'armature magnétique (106) étant disposée sur le pointeau de soupape, la douille (105) présentant une faible épaisseur de paroi dans une région à paroi mince (110) entre l'armature magnétique (106) et la bobine magnétique (103), la région à paroi mince (110) comprenant un élément de renforcement (108) pour recevoir des forces radiales,
    caractérisée en ce que
    le noyau magnétique (111) est disposé dans la direction radiale à l'intérieur de la douille (105) et
    en ce que la région à paroi mince (110) comporte une rainure annulaire (110) dans laquelle est disposé l'élément de renforcement (108).
  2. Électrovanne (113) selon la revendication 1, caractérisée en ce que l'élément de renforcement (108) comporte un matériau fibreux.
  3. Électrovanne (113) selon l'une quelconque des revendications précédentes, caractérisée en ce que l'élément de renforcement (108) comporte un matériau en fibres de carbone ou un matériau en fibres de verre ou un matériau en fibres d'Aramide.
  4. Électrovanne (113) selon la revendication 2 ou 3, caractérisée en ce que le matériau fibreux est disposé dans un matériau de fixation.
  5. Électrovanne (113) selon la revendication 4, caractérisée en ce que le matériau de fixation comporte un matériau plastique, de préférence un matériau en résine synthétique.
  6. Électrovanne (113) selon l'une quelconque des revendications précédentes, caractérisée en ce que la région à paroi mince (110) présente une épaisseur de paroi d'au maximum environ 0,2 mm, de préférence d'au maximum environ 0,1 mm.
  7. Procédé de fabrication d'une électrovanne (113), un pointeau de soupape guidé de manière déplaçable étant disposé dans la direction radiale à l'intérieur d'une douille (105), une bobine magnétique (103) étant disposée dans la direction radiale à l'extérieur de la douille (105), un noyau magnétique (111) étant disposé dans l'électrovanne, une armature magnétique (106) opposée axialement au noyau magnétique (111) étant disposée dans la direction radiale à l'intérieur de la douille (105), l'armature magnétique (106) étant disposée sur le pointeau de soupape, une région à paroi mince (110) présentant une faible épaisseur de paroi étant disposée dans la douille (105) entre l'armature magnétique (106) et la bobine magnétique (103), un élément de renforcement (108) pour recevoir des forces radiales étant disposé dans la région à paroi mince (110),
    caractérisé en ce que
    le noyau magnétique (111) est disposé dans la direction radiale à l'intérieur de la douille (105) et,
    pour produire la région à paroi mince (110), une rainure annulaire (110) est ménagée dans la douille (105), dans laquelle rainure annulaire est inséré l'élément de renforcement (108).
  8. Procédé de fabrication d'une électrovanne (113) selon la revendication 7, caractérisé en ce que la région à paroi mince (110) est renforcée par un matériau fibreux pour recevoir les forces radiales.
EP10190687A 2009-12-22 2010-11-10 Séparation magnétique pour une soupape magnétique Active EP2339596B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910055154 DE102009055154A1 (de) 2009-12-22 2009-12-22 Magnetische Trennung für Magnetventil

Publications (2)

Publication Number Publication Date
EP2339596A1 EP2339596A1 (fr) 2011-06-29
EP2339596B1 true EP2339596B1 (fr) 2013-03-27

Family

ID=43827052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10190687A Active EP2339596B1 (fr) 2009-12-22 2010-11-10 Séparation magnétique pour une soupape magnétique

Country Status (2)

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EP (1) EP2339596B1 (fr)
DE (1) DE102009055154A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011084724A1 (de) * 2011-10-18 2013-04-18 Robert Bosch Gmbh Verfahren zur Herstellung einer magnetischen Trennung für ein Magnetventil
EP2775132A1 (fr) * 2013-03-07 2014-09-10 Continental Automotive GmbH Corps de soupape et injecteur de fluide
CN104465012B (zh) * 2014-12-14 2016-08-17 成都大学 一种变通磁面积比例电磁铁

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2771295B2 (ja) 1989-09-14 1998-07-02 株式会社リコー 用紙揃え装置
DE4310719C2 (de) 1993-04-01 2002-09-12 Bosch Gmbh Robert Verfahren zur Herstellung eines Magnetkreises für ein Ventil
DE19503821A1 (de) * 1995-02-06 1996-08-08 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil
DE19808067A1 (de) * 1998-02-26 1999-09-02 Bosch Gmbh Robert Elektromagnetisch betätigbares Ventil
DE10235644B4 (de) 2002-08-02 2004-10-21 Eto Magnetic Kg Elektromagnetische Stellvorrichtung
DE102006014020A1 (de) 2006-01-17 2007-07-19 Robert Bosch Gmbh Polrohr
DE102006055010A1 (de) * 2006-11-22 2008-05-29 Robert Bosch Gmbh Verfahren zur Herstellung eines Magnetkreisbauteils

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Publication number Publication date
DE102009055154A1 (de) 2011-06-30
EP2339596A1 (fr) 2011-06-29

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