EP1580771A2 - Ignition coil and method to manufacture it - Google Patents

Ignition coil and method to manufacture it Download PDF

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Publication number
EP1580771A2
EP1580771A2 EP05001212A EP05001212A EP1580771A2 EP 1580771 A2 EP1580771 A2 EP 1580771A2 EP 05001212 A EP05001212 A EP 05001212A EP 05001212 A EP05001212 A EP 05001212A EP 1580771 A2 EP1580771 A2 EP 1580771A2
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EP
European Patent Office
Prior art keywords
hollow cylinder
ignition coil
housing
edges
windings
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.)
Withdrawn
Application number
EP05001212A
Other languages
German (de)
French (fr)
Other versions
EP1580771A3 (en
Inventor
Francesco Tridico
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 Ludwigsburg GmbH
Original Assignee
Beru AG
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 Beru AG filed Critical Beru AG
Publication of EP1580771A2 publication Critical patent/EP1580771A2/en
Publication of EP1580771A3 publication Critical patent/EP1580771A3/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • H01F2038/122—Ignition, e.g. for IC engines with rod-shaped core

Definitions

  • the invention relates to an ignition coil for an internal combustion engine, formed in the manner of a candle shaft ignition coil is and a cylindrical housing made of a plastic material, a housing arranged in the hollow cylinder of a electrically conductive sheet material and primary and secondary windings has, which are arranged in the hollow cylinder.
  • the housing which serves as a carrier for the internal components of the ignition coil, made by injection molding of a plastic material.
  • the hollow cylinder which consists of an electrically conductive sheet material, in particular an electrical sheet and as magnetic Inference serves is made by rolling and in the manufacture of the ignition coil in, by injection molding prefabricated housing mounted.
  • Another problem is the assembly of the hollow cylinder in prefabricated empty plastic housing.
  • the object underlying the invention is therefore therein, an ignition coil of the type mentioned and a To provide processes for their preparation in which the above mentioned assembly problems in the production no longer occur and in particular damage to the paint insulation of Wires of the windings during their installation in the hollow cylinder can be avoided.
  • the inventive method for producing such Ignition coil is characterized by the fact that before installation the windings of the hollow cylinder in an injection mold inserted and overmolded with the housing.
  • Ignition coil which is designed in the manner of a plug shaft ignition coil is, from a cylindrical housing 1 made of a plastic material, which is produced by injection molding, a Hollow cylinder 2 made of an electric sheet, the magnetic Conclusion forms and is made by rolling, wherein the hollow cylinder 2 in the housing 1 and on the inside thereof is mounted, and the inner, not shown Components of the ignition coil, in particular the primary and secondary windings.
  • the hollow cylinder 2 is in particular of several preferably two or three layers of an electric sheet running to To keep eddy current losses as low as possible.
  • the ignition coil described above and shown in Fig. 2 according to the invention is prepared by a method at before the installation of the windings of the hollow cylinder 2 in a Injection mold is inserted and molded with the housing 1.
  • this method can have a corresponding shaping of the injection mold can be achieved that the plastic mass all edges 3 of the hollow cylinder 1 in the illustrated in Fig. 2 Wrapped in a manner so that no danger to them Lackisolation of the winding wires when installing the windings especially the outer winding goes out.
  • Another advantage is that they have been common until now related protective devices, such as protective films, which are arranged above the primary winding, no longer needed become.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

An ignition coil for a combustion engine designed according to the spark plug channel ignition coil principal, has a cylindrical housing (1) made of a plastic material, a hollow cylinder made of an electrically conducting sheet metal material and arranged in the housing (1) and primary- and secondary-windings arranged in the hollow cylinder (2). The edges (3) of the hollow cylinder (2) are enclosed at its axial front faces by parts of the housing. An independent claim is included for a method of manufacturing an ignition coil.

Description

Die Erfindung betrifft eine Zündspule für eine Brennkraftmaschine, die nach Art einer Kerzenschachtzündspule ausgebildet ist und ein zylindrisches Gehäuse aus einen Kunststoffmaterial, einen im Gehäuse angeordneten Hohlzylinder aus einem elektrisch leitenden Blechmaterial und Primär- und Sekundärwicklungen aufweist, die im Hohlzylinder angeordnet sind.The invention relates to an ignition coil for an internal combustion engine, formed in the manner of a candle shaft ignition coil is and a cylindrical housing made of a plastic material, a housing arranged in the hollow cylinder of a electrically conductive sheet material and primary and secondary windings has, which are arranged in the hollow cylinder.

Bei einer derartigen üblichen Zündspule wird das Gehäuse, das als Träger für die inneren Bauteile der Zündspule dient, durch Spritzgießen aus einem Kunststoffmaterial hergestellt. Der Hohlzylinder, der aus einem elektrisch leitenden Blechmaterial, insbesondere einem Elektroblech besteht und als magnetischer Rückschluss dient, wird durch Rollieren hergestellt und bei der Herstellung der Zündspule in das, durch Spritzgießen vorgefertigte Gehäuse montiert.In such a conventional ignition coil, the housing, which serves as a carrier for the internal components of the ignition coil, made by injection molding of a plastic material. The hollow cylinder, which consists of an electrically conductive sheet material, in particular an electrical sheet and as magnetic Inference serves is made by rolling and in the manufacture of the ignition coil in, by injection molding prefabricated housing mounted.

Bei einer derartigen üblichen Zündspule stehen nach der Montage des Hohlzylinders im Gehäuse die zum Teil scharfen Innenkanten des Hohlzylinders frei im Gehäuse vor. Das hat zur Folge, dass bei der anschließenden Montage insbesondere der als Außenwicklung ausgebildeten Primärwicklung, diese scharfen Kanten des Hohlzylinders im Weg stehen und bei dem Einsetzen der Außenwicklung die Lackisolation des Wicklungsdrahtes beschädigen können. Das hat einen Kurzschluss der Wicklung zur Folge.In such a conventional ignition coil are after the Assembly of the hollow cylinder in the housing partly sharp inner edges of the hollow cylinder freely in the housing. That has to Result that in the subsequent assembly in particular the designed as an outer winding primary winding, this sharp Edge of the hollow cylinder in the way and when inserting the outer winding damage the paint insulation of the winding wire can. This has a short circuit of the winding to Episode.

Bei der üblichen oben beschriebenen Zündspule und dem üblichen Verfahren zu ihrer Herstellung ist es somit als nachteilig anzusehen, dass die freiliegenden Kanten des Hohlzylinders bei der Montage der Wicklungen die Wicklungsdrähte beschädigen können.In the usual ignition coil described above and the usual Process for their preparation, it is therefore disadvantageous to look at that the exposed edges of the hollow cylinder damage the winding wires during assembly of the windings can.

Problematisch ist weiterhin die Montage des Hohlzylinders im vorgefertigten leeren Kunststoffgehäuse.Another problem is the assembly of the hollow cylinder in prefabricated empty plastic housing.

Die der Erfindung zugrunde liegende Aufgabe besteht daher darin, eine Zündspule der eingangs genannten Art sowie ein Verfahren zu ihrer Herstellung zu schaffen, bei denen die oben erwähnten Montageprobleme bei der Fertigung nicht mehr auftreten und insbesondere eine Beschädigung der Lackisolation der Drähte der Wicklungen bei ihrem Einbau in den Hohlzylinder vermieden werden kann.The object underlying the invention is therefore therein, an ignition coil of the type mentioned and a To provide processes for their preparation in which the above mentioned assembly problems in the production no longer occur and in particular damage to the paint insulation of Wires of the windings during their installation in the hollow cylinder can be avoided.

Diese Aufgabe wird bei der erfindungsgemäßen Zündspule dadurch gelöst, dass die Kanten des Hohlzylinders an seinen axialen Stirnseiten durch Teile des Gehäuses umhüllt sind.This object is characterized in the ignition coil according to the invention thereby solved that the edges of the hollow cylinder at its axial End faces are enveloped by parts of the housing.

Das erfindungsgemäße Verfahren zur Herstellung einer derartigen Zündspule zeichnet sich dadurch aus, dass vor dem Einbau der Wicklungen der Hohlzylinder in eine Spritzwerkzeug eingelegt und mit dem Gehäuse umspritzt wird. The inventive method for producing such Ignition coil is characterized by the fact that before installation the windings of the hollow cylinder in an injection mold inserted and overmolded with the housing.

Im Folgenden wird anhand der zugehörigen Zeichnungen ein besonders bevorzugtes Ausführungsbeispiel der Erfindung näher beschrieben. Es zeigen

  • Fig. 1 in einer Schnittansicht und einer Detailansicht eine Zündspule nach dem Stand der Technik und
  • Fig. 2 in einer entsprechenden Schnittansicht und Detailansicht ein Ausführungsbeispiel der erfindungsgemäßen Zündspule.
    • In the following, a particularly preferred embodiment of the invention will be described with reference to the accompanying drawings. Show it
  • Fig. 1 in a sectional view and a detail view of an ignition coil according to the prior art and
  • Fig. 2 in a corresponding sectional view and detailed view of an embodiment of the ignition coil according to the invention.

    • Wie es in Fig. 1 dargestellt ist, besteht eine übliche Zündspule, die nach Art einer Kerzenschachtzündspule ausgebildet ist, aus einem zylindrischen Gehäuse 1 aus einem Kunststoffmaterial, das durch Spritzgießen hergestellt wird, einem Hohlzylinder 2 aus einem Elektroblech, das den magnetischen Rückschluss bildet und durch Rollieren hergestellt ist, wobei der Hohlzylinder 2 im Gehäuse 1 und an dessen Innenseite anliegend montiert ist, sowie den nicht dargestellten inneren Bauteilen der Zündspule, insbesondere der Primär- und Sekundärwicklungen.As shown in Fig. 1, there is a common one Ignition coil, which is designed in the manner of a plug shaft ignition coil is, from a cylindrical housing 1 made of a plastic material, which is produced by injection molding, a Hollow cylinder 2 made of an electric sheet, the magnetic Conclusion forms and is made by rolling, wherein the hollow cylinder 2 in the housing 1 and on the inside thereof is mounted, and the inner, not shown Components of the ignition coil, in particular the primary and secondary windings.

    Der Hohlzylinder 2 ist insbesondere aus mehreren vorzugsweise zwei oder drei Lagen eines Elektrobleches ausgeführt, um Wirbelstromverluste möglichst gering zu halten.The hollow cylinder 2 is in particular of several preferably two or three layers of an electric sheet running to To keep eddy current losses as low as possible.

    Wie es in insbesondere in der Ansicht des Details in Fig. 1 dargestellt ist, stehen nach der Montage des Hohlzylinders 2 im durch Spritzgießen vorgefertigten Gehäuse 1 die zum Teil scharfen Innenkanten 3 des Hohlzylinders 2 an seinen axialen Stirnseiten frei im Gehäuse 1 vor. Wenn anschließend die in der Zeichnung nicht dargestellten inneren Bauteile der Zündspule insbesondere die die Primärwicklung bildende Außenwicklung im Hohlzylinder 2 montiert wird, das heißt in den Innenraum des Hohlzylinders 2 eingebracht wird, stehen diese scharfen Kanten 3 im Weg, so dass sie die Lackisolation des Drahtes der Wicklung beschädigen können. Das hätte einen Kurzschluss der Wicklung zur Folge.As can be seen in particular in the view of the detail in FIG. 1, stand after the assembly of the hollow cylinder. 2 in prefabricated by injection molding housing 1 the part sharp inner edges 3 of the hollow cylinder 2 at its axial Front sides freely in the housing 1 before. If subsequently the in the drawing, not shown internal components of the ignition coil in particular, the outer winding forming the primary winding is mounted in the hollow cylinder 2, that is in the interior of the hollow cylinder 2 is introduced, these are sharp Edges 3 in the way, leaving the paint insulation of the wire can damage the winding. That would have a short circuit the winding result.

    Diese Gefahr ist bei dem in Fig. 2 dargestellten Ausführungsbeispiel der erfindungsgemäßen Zündspule dadurch beseitigt, dass in der in der Detailansicht dargestellten Weise das Gehäuse mit daran angeformten radial vorstehenden Teilen die scharfen Kanten des Hohlzylinders 2 an seinen axialen Stirnseiten umhüllt. Vorzugsweise sind diese Teile des Gehäuses, die die Kanten des Hohlzylinders 2 umhüllen, an ihren Innenseiten abgerundet, wie gleichfalls in Fig. 2 dargestellt ist, so dass auch diese Teile des Gehäuses 1 beim Einbau der Wicklungen nicht stören oder die Wicklungsdrähte beschädigen können.This danger is in the embodiment shown in Fig. 2 thereby eliminating the ignition coil according to the invention, that in the manner shown in the detail view the Housing with molded radially projecting parts the sharp edges of the hollow cylinder 2 at its axial end faces envelops. Preferably, these parts of the housing, which envelop the edges of the hollow cylinder 2, on their inner sides rounded, as also shown in Fig. 2, so that these parts of the housing 1 when installing the windings Do not disturb or damage the winding wires.

    Die oben beschriebene und in Fig. 2 dargestellte Zündspule gemäß der Erfindung wird nach einem Verfahren hergestellt, bei dem vor dem Einbau der Wicklungen der Hohlzylinder 2 in ein Spritzwerkzeug eingelegt und mit dem Gehäuse 1 umspritzt wird. Bei diesem Verfahren kann über ein entsprechende Formgebung des Spritzwerkzeuges erreicht werden, dass die Kunststoffmasse alle Kanten 3 des Hohlzylinders 1 in der in Fig. 2 dargestellten Weise umhüllt, so dass von diesen keine Gefahr für die Lackisolation der Wicklungsdrähte beim Einbau der Wicklungen insbesondere der Außenwicklung ausgeht.The ignition coil described above and shown in Fig. 2 according to the invention is prepared by a method at before the installation of the windings of the hollow cylinder 2 in a Injection mold is inserted and molded with the housing 1. In this method can have a corresponding shaping of the injection mold can be achieved that the plastic mass all edges 3 of the hollow cylinder 1 in the illustrated in Fig. 2 Wrapped in a manner so that no danger to them Lackisolation of the winding wires when installing the windings especially the outer winding goes out.

    In dieser Weise ist gewährleistet, dass bei einer vollautomatischen Montage der Zündspule keine Wicklungsbeschädigungen vorkommen können.In this way it is guaranteed that in a fully automatic Ignition coil assembly no winding damage can happen.

    Bei dem erfindungsgemäßen Verfahren ist es somit durch die Umspritzung des Hohlzylinders, das heißt der Rückschlussbleche des Hohlzylinders möglich, dessen scharfe Kanten mit Kunststoff zu überdecken, so dass diese bei der Montage der Primärwicklung nicht im Weg stehen und die Lackisolation der Wicklungsdrähte nicht beschädigen können. Dadurch wird die Montage der Primärwicklung für eine vollständig automatisierte Montage der gesamten Zündspule erleichtert.In the method according to the invention, it is thus by the Encapsulation of the hollow cylinder, that is the return plates the hollow cylinder possible, whose sharp edges with plastic to cover, so that these in the assembly of the primary winding do not get in the way and the paint insulation of the winding wires can not damage. This will make the assembly the primary winding for a fully automated assembly the entire ignition coil facilitates.

    Ein weiterer Vorteil besteht darin, dass die bisher häufig verwandten Schutzeinrichtungen, beispielsweise Schutzfolien, die über der Primärwicklung angeordnet sind, nicht mehr benötigt werden.Another advantage is that they have been common until now related protective devices, such as protective films, which are arranged above the primary winding, no longer needed become.

    Claims (4)

    Zündspule für eine Brennkraftmaschine, die nach Art einer Kerzenschachtzündspule ausgebildet ist und ein zylindrisches Gehäuse (1) aus einem Kunststoffmaterial, einen im Gehäuse (1) angeordneten Hohlzylinder (2) aus einem elektrisch leitenden Blechmaterial und Primär- und Sekundärwicklungen aufweist, die im Hohlzylinder (2) angeordnet sind,    dadurch gekennzeichnet, dass die Kanten (3) des Hohlzylinders (2) an seinen axialen Stirnseiten durch Teile des Gehäuses (1) umhüllt sind. Ignition coil for an internal combustion engine, which is designed in the manner of a Kerzenschachtzündspule and a cylindrical housing (1) made of a plastic material, a in the housing (1) arranged hollow cylinder (2) made of an electrically conductive sheet metal material and Has primary and secondary windings which are arranged in the hollow cylinder (2), characterized in that the edges (3) of the hollow cylinder (2) are enveloped at its axial end faces by parts of the housing (1). Zündspule nach Anspruch 1, dadurch gekennzeichnet, dass die Teile des Gehäuses (1), die die Kanten (3) des Hohlzylinders (2) umhüllen, an ihren Innenseiten abgerundet sind.Ignition coil according to claim 1, characterized in that the parts of the housing (1), which envelop the edges (3) of the hollow cylinder (2), are rounded at their insides. Zündspule nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Hohlzylinder (2) aus mehreren, insbesondere zwei oder drei Langen des Blechmaterials gebildet ist.Ignition coil according to claim 1 or 2, characterized in that the hollow cylinder (2) is formed of a plurality, in particular two or three lengths of the sheet metal material. Verfahren zum Herstellen einer Zündspule nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass vor dem Einbau der Wicklungen der Hohlzylinder (2) in ein Spritzwerkzeug eingelegt und mit dem Gehäuse (1) umspritzt wird.Method for producing an ignition coil according to claim 1, 2 or 3, characterized in that before the installation of the windings of the hollow cylinder (2) is inserted into an injection mold and molded with the housing (1).
    EP05001212A 2004-03-26 2005-01-21 Ignition coil and method to manufacture it Withdrawn EP1580771A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE200410014934 DE102004014934B3 (en) 2004-03-26 2004-03-26 Ignition coil and method for its production
    DE102004014934 2004-03-26

    Publications (2)

    Publication Number Publication Date
    EP1580771A2 true EP1580771A2 (en) 2005-09-28
    EP1580771A3 EP1580771A3 (en) 2006-04-19

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    Application Number Title Priority Date Filing Date
    EP05001212A Withdrawn EP1580771A3 (en) 2004-03-26 2005-01-21 Ignition coil and method to manufacture it

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    DE (1) DE102004014934B3 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102004014934B3 (en) 2004-03-26 2005-12-08 Beru Ag Ignition coil and method for its production

    Citations (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0898289A2 (en) * 1997-08-07 1999-02-24 Sumitomo Wiring Systems, Ltd. Ignition coil having a toroidal magnet
    DE102004014934B3 (en) 2004-03-26 2005-12-08 Beru Ag Ignition coil and method for its production

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE4446716C1 (en) * 1994-12-16 1996-10-24 Aeg Tro Transformatoren Gmbh Insulation arrangement for magnetic screening of transformer tank walls and of choke coils
    JPH10199737A (en) * 1996-11-18 1998-07-31 Matsushita Electric Ind Co Ltd Ignition coil device for internal combustion engine
    DE19702438C2 (en) * 1997-01-24 1999-05-06 Bremicker Auto Elektrik Rod ignition coil for internal combustion engines
    DE29805372U1 (en) * 1998-03-25 1999-08-05 Robert Bosch Gmbh, 70469 Stuttgart Rod coil for ignition systems
    DE10257101B3 (en) * 2002-12-05 2004-05-19 Robert Bosch Gmbh Vehicle engine ignition coil in rod configuration, employs plastic over-injection molding to seal magnetic return section and form casing for coil

    Patent Citations (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0898289A2 (en) * 1997-08-07 1999-02-24 Sumitomo Wiring Systems, Ltd. Ignition coil having a toroidal magnet
    DE102004014934B3 (en) 2004-03-26 2005-12-08 Beru Ag Ignition coil and method for its production

    Also Published As

    Publication number Publication date
    EP1580771A3 (en) 2006-04-19
    DE102004014934B3 (en) 2005-12-08

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