EP2016653B1 - Ignition coil for an internal combustion engine, in particular of a motor vehicle - Google Patents

Ignition coil for an internal combustion engine, in particular of a motor vehicle Download PDF

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Publication number
EP2016653B1
EP2016653B1 EP07727839A EP07727839A EP2016653B1 EP 2016653 B1 EP2016653 B1 EP 2016653B1 EP 07727839 A EP07727839 A EP 07727839A EP 07727839 A EP07727839 A EP 07727839A EP 2016653 B1 EP2016653 B1 EP 2016653B1
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EP
European Patent Office
Prior art keywords
contact
ignition coil
contact sleeve
sleeve
retaining element
Prior art date
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Active
Application number
EP07727839A
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German (de)
French (fr)
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EP2016653A1 (en
Inventor
Konstantin Lindenthal
Thomas Breckle
Johannes Kappeler
Holger Raaf
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2016653A1 publication Critical patent/EP2016653A1/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
    • 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
    • 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
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • 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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/10—Connecting leads to windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads

Definitions

  • the invention relates to an ignition coil, in particular for an internal combustion engine of a motor vehicle according to the preamble of claim 1.
  • Such an ignition coil is from the DE 102 51 840 A1 known.
  • the known ignition coil of the end portion of a secondary bobbin is received together with a contact sleeve of a cup-like end portion of a high voltage bolt ( FIG. 4 ).
  • the high-voltage pin protrudes up to a stop on the secondary coil body zoom, which in turn serves as a stop for the contact sleeve.
  • contact sleeve and high-voltage pin end in the same plane.
  • the contact sleeve Since the contact sleeve has relatively sharp corners and edges as a result of their formation as a stamped part, cracks can be caused by these regions during operation of the ignition coil due to the different thermal expansion coefficients of the materials under varying temperatures. If the cracks extend over a larger area in the ignition coil housing, there is a risk of flashovers that affect the functioning of the ignition coil.
  • the ignition coil according to the invention in particular for an internal combustion engine of a motor vehicle, with the features of claim 1 has the advantage that the extent of cracks is limited or limited in thermomechanical stress of the ignition coil. This is achieved according to the invention essentially in that the hold-down element surrounding the contact sleeve projects beyond or covers the contact sleeve that cracks emanating from corners or edges of the contact sleeve still terminate within the hold-down element, and can not expand further outside the hold-down element in the housing of the ignition coil.
  • the ignition coil 10 has an existing plastic, substantially sleeve-shaped housing 11 from.
  • a secondary coil body 13 is inserted with a secondary winding 14.
  • the high voltage carrying secondary winding 14 provides the ignition energy for a spark plug, not shown, of an internal combustion engine.
  • the secondary coil body 13 has a smaller diameter portion 16, on which the one contacting the spark plug one end of the secondary winding 14 is wound.
  • About the end portion 17 of the section 16 is a made of electrically conductive metal contact sleeve 18 is pushed.
  • the contact sleeve 18 has a circular or annular portion 19, emanate from the bent contact tabs 20.
  • the contact sleeve 18 is preferably produced by a stamping process in which the contact tabs 20 are bent from the region 19 after punching.
  • the contact tabs 20 contact areas 21, which after the Sliding the contact sleeve 18 on the end portion 17 of the secondary coil body 13 in register with the arranged in section 16 secondary winding 14 are.
  • the contact tabs 20 are on the side facing away from the region 19 of the contact portions 21 radially bent slightly outwards and end in hold-down sections 22. From area 19 of the contact sleeve 18 protrude at uniform angular intervals in the embodiment, three triangular contact ribs 24 inside.
  • the hold-down element 25 is made in the illustrated embodiment of sheet metal by a non-cutting forming process, and has on the contact sleeve 18 side facing a radially outwardly widening insertion region 26.
  • the material of the hold-down element 25 is flanged so that a rounded inlet edge 27 results without sharp corners or edges.
  • the length of the hold-down element 25 is dimensioned such that when reaching in the FIG. 3 illustrated end position of the hold-down element 25 of the insertion 26 is viewed with its leading edge 27 in the direction of the secondary bobbin 13 behind the contact plates 20.
  • the contact tabs 20 are not only covered by the hold-down element 25, but the hold-down element 25 still extends by a certain length, for example by a third or half the length of the contact tabs 20 beyond the contact tabs 20.
  • a pin-shaped suppression resistor 31 is inserted in the sleeve-shaped end of the end portion 17 of the secondary coil body 13.
  • the interference resistor 31 is integrally connected to a high voltage terminal 32, which in turn electrically contacts the spark plug, not shown.
  • the merging of suppression resistor 31 and secondary coil body 13 takes place when mounted on the secondary coil body 13 contact sleeve 18 and hold-down element 25. In this case, the suppression resistor 31 first passes through an opening 33 of the hold-down element 25 to subsequently penetrate through the annular portion 19 of the contact sleeve 18.
  • the formation of the contact ribs 24th on the region 19 of the contact sleeve 18 is such that the contact ribs 24 come into operative connection with the circumference of the Entstörwiderstands 31 and thereby penetrate the outer protective layer, so that an electrical connection between the contact sleeve 18 and the high voltage terminal 32 via the suppression resistor 31.
  • the housing 11 After mounting the components of the ignition coil 10, the housing 11 is filled with a thermosetting insulating resin, which fills the gaps in the ignition coil 10, and in particular ensures electrical insulation between the voltage-bearing components.
  • This insulating resin inter alia also fills the annular space 35 between the hold-down element 25 and the secondary bobbin 13 ( FIG. 3 ).
  • the contact sleeve 18 Due to the punching process, the contact sleeve 18 usually has a plurality of relatively sharp corners or edges, in particular the contact tabs 22. From these areas, a risk of cracking in the insulating resin is caused by thermomechanical stresses. If these cracks extend between components having different voltage levels, there is the risk of voltage flashovers which impair the function of the ignition coil 10.
  • the hold-down element 25 can not only, as described in the exemplary embodiment, consist of an electrically conductive or non-conductive metal, but can for example also be made of plastic.
  • the hold-down element and the high voltage terminal as a combined, one-piece, consisting of conductive metal component 36 are formed.
  • contact ribs 24a are provided on the contact sleeve 18a, which are arranged radially outwardly projecting on the contact sleeve 18a.
  • the electrical connection is produced in such a way that, when the component 36 is pushed over onto the contact sleeve 18a, the contact ribs 24a make electrical contact with the component 36 on its inner wall.
  • the length of the component 36 such that its insertion 37 clearly overlap the contact tabs 22a of the contact sleeve 18a in the final position of the component 36 and thus emanating from the contact sleeve 18a propagation of cracks in the insulating resin outside of the component 36 can be avoided.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Zündspule, insbesondere für eine Brennkraftmaschine eines Kraftfahrzeugs nach dem Oberbegriff des Anspruchs 1.The invention relates to an ignition coil, in particular for an internal combustion engine of a motor vehicle according to the preamble of claim 1.

Eine derartige Zündspule ist aus der DE 102 51 840 A1 bekannt. Bei der bekannten Zündspule ist der Endbereich eines Sekundärspulenkörpers zusammen mit einer Kontakthülse von einem becherartigen Endabschnitt eines Hochspannungsbolzens aufgenommen (Figur 4). Dabei ragt der Hochspannungsbolzen bis an einen Anschlag am Sekundärspulenkörper heran, der wiederum gleichzeitig als Anschlag für die Kontakthülse dient. Dadurch enden Kontakthülse und Hochspannungsbolzen in derselben Ebene. Nach der Montage der einzelnen Bauteile wird die Zündspule bzw. das Zündspulengehäuse mit einem Isolierharz gefüllt. Da die Kontakthülse in Folge ihrer Ausbildung als Stanzteil relativ scharfe Ecken und Kanten aufweist, können von diesen Bereichen beim Betrieb der Zündspule aufgrund der unterschiedlichen Wärmeausdehnungskoeffizienten der Materialien unter wechselnden Temperaturen Risse ausgehen. Wenn sich die Risse über einen größeren Bereich im Zündspulengehäuse ausdehnen besteht die Gefahr, dass es zu Spannungsüberschlägen kommt, die die Funktionsfähigkeit der Zündspule beeinträchtigen.Such an ignition coil is from the DE 102 51 840 A1 known. In the known ignition coil of the end portion of a secondary bobbin is received together with a contact sleeve of a cup-like end portion of a high voltage bolt ( FIG. 4 ). In this case, the high-voltage pin protrudes up to a stop on the secondary coil body zoom, which in turn serves as a stop for the contact sleeve. As a result, contact sleeve and high-voltage pin end in the same plane. After assembly of the individual components, the ignition coil or the ignition coil housing is filled with an insulating resin. Since the contact sleeve has relatively sharp corners and edges as a result of their formation as a stamped part, cracks can be caused by these regions during operation of the ignition coil due to the different thermal expansion coefficients of the materials under varying temperatures. If the cracks extend over a larger area in the ignition coil housing, there is a risk of flashovers that affect the functioning of the ignition coil.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Zündspule, insbesondere für eine Brennkraftmaschine eines Kraftfahrzeugs, mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, dass die Ausdehnung von Rissen bei thermomechanischer Beanspruchung der Zündspule eingegrenzt bzw. beschränkt wird. Dies wird erfindungsgemäß im wesentlichen dadurch erreicht, dass das die Kontakthülse umgebende Niederhalteelement die Kontakthülse überragt bzw. abdeckt, so dass von Ecken oder Kanten der Kontakthülse ausgehende Risse noch innerhalb des Niederhalteelements enden, und sich nicht weiter außerhalb des Niederhalteelments im Gehäuse der Zündspule ausdehnen können.The ignition coil according to the invention, in particular for an internal combustion engine of a motor vehicle, with the features of claim 1 has the advantage that the extent of cracks is limited or limited in thermomechanical stress of the ignition coil. This is achieved according to the invention essentially in that the hold-down element surrounding the contact sleeve projects beyond or covers the contact sleeve that cracks emanating from corners or edges of the contact sleeve still terminate within the hold-down element, and can not expand further outside the hold-down element in the housing of the ignition coil.

Vorteilhafte Weiterbildungen der erfindungsgemäßen Zündspule, insbesondere für eine Brennkraftmaschine eines Kraftfahrzeugs sind in den Unteransprüchen angegeben.Advantageous developments of the ignition coil according to the invention, in particular for an internal combustion engine of a motor vehicle are specified in the subclaims.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend näher erläutert. Es zeigen:

Figur 1
einen stark vereinfachten Längsschnitt durch Teile einer Zündspule,
Figur 2
Bauteile des hochspannungsseitigen Anschlusses der Zündspule der Figur 1 in Explosionsdarstellung,
Figur 3
den Bereich des Hochspannungsanschlusses in einem vergrösserten Längsschnitt und
Figur 4
eine Explosionsdarstellung bei einem modifizierten hochspannungsseitigen Anschluss der Zündspule.
An embodiment of the invention is illustrated in the drawing and will be explained in more detail below. Show it:
FIG. 1
a greatly simplified longitudinal section through parts of an ignition coil,
FIG. 2
Components of the high-voltage side connection of the ignition coil FIG. 1 in exploded view,
FIG. 3
the area of the high voltage terminal in an enlarged longitudinal section and
FIG. 4
an exploded view of a modified high-voltage side connection of the ignition coil.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In der Figur 1 sind Teile einer als Stabzündspule ausgebildeten Zündspule 10 dargestellt. Die Zündspule 10 weist ein aus Kunststoff bestehendes, im wesentlichen hülsenförmig ausgebildetes Gehäuse 11 aus. Im Gehäuse 11 ist unter anderem ein Sekundärspulenkörper 13 mit einer Sekundärwicklung 14 eingesetzt. Die Hochspannung tragende Sekundärwicklung 14 liefert die Zündenergie für eine nicht dargestellte Zündkerze einer Brennkraftmaschine. Der Sekundärspulenkörper 13 weist einen einen geringeren Durchmesser aufweisenden Abschnitt 16 auf, auf das auch das mit der Zündkerze kontaktierende eine Ende der Sekundärwicklung 14 aufgewickelt ist. Über den Endbereich 17 des Abschnitts 16 ist eine aus elektrisch leitendem Metall bestehende Kontakthülse 18 übergeschoben.In the FIG. 1 Parts of a trained as a pencil ignition coil ignition coil 10 are shown. The ignition coil 10 has an existing plastic, substantially sleeve-shaped housing 11 from. In the housing 11, among other things, a secondary coil body 13 is inserted with a secondary winding 14. The high voltage carrying secondary winding 14 provides the ignition energy for a spark plug, not shown, of an internal combustion engine. The secondary coil body 13 has a smaller diameter portion 16, on which the one contacting the spark plug one end of the secondary winding 14 is wound. About the end portion 17 of the section 16 is a made of electrically conductive metal contact sleeve 18 is pushed.

Wie am besten aus der Figur 2 ersichtlich ist, weist die Kontakthülse 18 einen kreis- bzw. ringförmigen Bereich 19 auf, von dem umgebogene Kontaktlaschen 20 ausgehen. Die Kontakthülse 18 ist vorzugsweise durch einen Stanzprozess hergestellt, bei dem nach dem Stanzen die Kontaktlaschen 20 vom Bereich 19 umgebogen werden. Auf der dem Abschnitt 16 zugewandten Seite weisen die Kontaktlaschen 20 Kontaktbereiche 21 auf, welche nach dem Überschieben der Kontakthülse 18 auf den Endbereich 17 des Sekundärspulenkörpers 13 in Überdeckung mit der im Abschnitt 16 angeordneten Sekundärwicklung 14 sind. Die Kontaktlaschen 20 sind auf der dem Bereich 19 abgewandten Seite der Kontaktbereiche 21 radial etwas nach außen aufgebogen und enden in Niederhalteabschnitten 22. Vom Bereich 19 der Kontakthülse 18 ragen in gleichmäßigen Winkelabständen im Ausführungsbeispiel drei dreiecksförmige Kontaktrippen 24 nach innen.How best of the FIG. 2 it can be seen, the contact sleeve 18 has a circular or annular portion 19, emanate from the bent contact tabs 20. The contact sleeve 18 is preferably produced by a stamping process in which the contact tabs 20 are bent from the region 19 after punching. On the side facing the portion 16, the contact tabs 20 contact areas 21, which after the Sliding the contact sleeve 18 on the end portion 17 of the secondary coil body 13 in register with the arranged in section 16 secondary winding 14 are. The contact tabs 20 are on the side facing away from the region 19 of the contact portions 21 radially bent slightly outwards and end in hold-down sections 22. From area 19 of the contact sleeve 18 protrude at uniform angular intervals in the embodiment, three triangular contact ribs 24 inside.

Über die Kontakthülse 18 ist ein hülsenförmiges Niederhalteelement 25 überschiebbar. Das Niederhalteelement 25 ist im dargestellten Ausführungsbeispiel aus Blech durch einen spanlosen Umformvorgang hergestellt, und weist auf der der Kontakthülse 18 zugewandten Seite einen radial nach außen erweiterten Einführbereich 26 auf. Im Einführbereich 26 ist das Material des Niederhalteelements 25 umgebördelt, so dass sich eine gerundet ausgebildete Einlaufkante 27 ohne scharfe Ecken oder Kanten ergibt. Wesentlich ist, dass die Länge des Niederhalteelements 25 derart bemessen ist, dass beim Erreichen der in der Figur 3 dargestellten Endposition des Niederhalteelements 25 der Einführbereich 26 mit seiner Einlaufkante 27 in Richtung des Sekundärspulenkörpers 13 betrachtet hinter den Kontaktlaschen 20 angeordnet ist. Insbesondere sind die Kontaktlaschen 20 vom Niederhalteelement 25 nicht nur überdeckt, sondern das Niederhalteelement 25 reicht noch um eine bestimmte Länge, beispielsweise um ein Drittel oder die Hälfte der Länge der Kontaktlaschen 20 über die Kontaktlaschen 20 hinaus.About the contact sleeve 18, a sleeve-shaped hold-down element 25 can be pushed over. The hold-down element 25 is made in the illustrated embodiment of sheet metal by a non-cutting forming process, and has on the contact sleeve 18 side facing a radially outwardly widening insertion region 26. In the insertion region 26, the material of the hold-down element 25 is flanged so that a rounded inlet edge 27 results without sharp corners or edges. It is essential that the length of the hold-down element 25 is dimensioned such that when reaching in the FIG. 3 illustrated end position of the hold-down element 25 of the insertion 26 is viewed with its leading edge 27 in the direction of the secondary bobbin 13 behind the contact plates 20. In particular, the contact tabs 20 are not only covered by the hold-down element 25, but the hold-down element 25 still extends by a certain length, for example by a third or half the length of the contact tabs 20 beyond the contact tabs 20.

Beim Überschieben des Niederhalteelements 25 auf die Kontakthülse 18 werden die zunächst gegebenefalls zur Sekundärwicklung 14 noch etwas beabstandeten Kontaktlaschen 20 durch eine entsprechende Bemaßung des Innendurchmessers des Niederhalteelements 25 über die Niederhalteabschnitte 22 der Kontaktlaschen 20 in Richtung der Sekundärwindung 14 gedrückt, so dass die Kontaktbereiche 21 unter Bildung einer elektrisch leitenden Verbindung an der Sekundärwicklung 14 anliegen.When pushing the hold-down member 25 on the contact sleeve 18, the first given to the secondary winding 14 slightly spaced contact tabs 20 are pressed by a corresponding dimensioning of the inner diameter of the hold-down member 25 on the hold-down portions 22 of the contact plates 20 in the direction of the secondary winding 14 so that the contact portions 21 under Forming an electrically conductive connection to the secondary winding 14 abut.

In das hülsenförmige Ende des Endbereichs 17 des Sekundärspulenkörpers 13 ist ein stiftförmiger Entstörwiderstand 31 einführbar. Der Enstörwiderstand 31 ist einstückig mit einem Hochspannungsanschluss 32 verbunden, welcher wiederum die nicht dargestellte Zündkerze elektrisch kontaktiert. Das Zusammenführen von Entstörwiderstand 31 und Sekundärspulenkörper 13 erfolgt bei auf dem Sekundärspulenkörper 13 montierter Kontakthülse 18 und Niederhalteelement 25. Dabei durchdringt der Entstörwiderstand 31 zunächst die eine Öffnung 33 des Niederhalteelements 25, um anschließend durch den ringförmigen Bereich 19 der Kontakthülse 18 zu dringen. Wesentlich dabei ist, dass die Ausbildung der Kontaktrippen 24 auf dem Bereich 19 der Kontakthülse 18 derart ist, dass die Kontaktrippen 24 in Wirkverbindung mit dem Umfang des Entstörwiderstands 31 gelangen und dabei dessen äußere Schutzschicht durchdringen, so dass eine elektrische Verbindung zwischen der Kontakthülse 18 und dem Hochspannungsanschluss 32 über den Entstörwiderstand 31 erfolgt.In the sleeve-shaped end of the end portion 17 of the secondary coil body 13, a pin-shaped suppression resistor 31 is inserted. The interference resistor 31 is integrally connected to a high voltage terminal 32, which in turn electrically contacts the spark plug, not shown. The merging of suppression resistor 31 and secondary coil body 13 takes place when mounted on the secondary coil body 13 contact sleeve 18 and hold-down element 25. In this case, the suppression resistor 31 first passes through an opening 33 of the hold-down element 25 to subsequently penetrate through the annular portion 19 of the contact sleeve 18. It is essential that the formation of the contact ribs 24th on the region 19 of the contact sleeve 18 is such that the contact ribs 24 come into operative connection with the circumference of the Entstörwiderstands 31 and thereby penetrate the outer protective layer, so that an electrical connection between the contact sleeve 18 and the high voltage terminal 32 via the suppression resistor 31.

Nach der Montage der Bauteile der Zündspule 10 wird das Gehäuse 11 mit einem aushärtenden Isolierharz befüllt, welches die Zwischenräume in der Zündspule 10 ausfüllt und dabei insbesondere für eine elektrische Isolierung zwischen den Spannung tragenden Bauteilen sorgt. Dieses Isolierharz füllt unter anderem auch den ringförmigen Raum 35 zwischen dem Niederhalteelement 25 und dem Sekundärspulenkörper 13 aus (Figur 3). Aufgrund des Stanzprozesses weist die Kontakthülse 18 üblicherweise eine Vielzahl von relativ scharfen Ecken bzw. Kanten auf, dabei insbesondere die Kontaktlaschen 22. Von diesen Bereichen geht bei thermomechanischen Beanspruchungen eine Rissgefahr im Isolierharz aus. Wenn sich diese Risse zwischen unterschiedlichem Spannungsniveau aufweisenden Bauteilen erstrecken, besteht die Gefahr von Spannungsüberschlägen, die die Funktion der Zündspule 10 beeinträchtigen. Dadurch, dass der Mantel des Niederhalteelements 25 die Kontaktlaschen 22 erfindungsgemäß deutlich überdeckt, enden von den Kontaktlaschen 22 oder anderen Bereichen der Kontakthülse 18 ausgehende Risse im Isolierharz innerhalb des Niederhalteelements 25, ohne dass sie sich außerhalb des Niederhalteelements 25 zu anderen Bauteilen ausweiten können. Durch die gerundet ausgebildete Einlaufkante 27 des Niederhaltelements 25 geht auch von diesem Bereich eine relativ geringe Rissgefahr aus.After mounting the components of the ignition coil 10, the housing 11 is filled with a thermosetting insulating resin, which fills the gaps in the ignition coil 10, and in particular ensures electrical insulation between the voltage-bearing components. This insulating resin inter alia also fills the annular space 35 between the hold-down element 25 and the secondary bobbin 13 ( FIG. 3 ). Due to the punching process, the contact sleeve 18 usually has a plurality of relatively sharp corners or edges, in particular the contact tabs 22. From these areas, a risk of cracking in the insulating resin is caused by thermomechanical stresses. If these cracks extend between components having different voltage levels, there is the risk of voltage flashovers which impair the function of the ignition coil 10. Due to the fact that the jacket of the hold-down element 25 clearly covers the contact lugs 22, cracks in the insulating resin within the hold-down element 25 originate from the contact lugs 22 or other areas of the contact sleeve 18, without being able to expand outside the hold-down element 25 to other components. Due to the rounded trained inlet edge 27 of the hold-down member 25 is also from this area a relatively low risk of cracking.

Ergänzend wird erwähnt, dass das Niederhalteelement 25 nicht nur, wie im Ausführungsbeispiel beschrieben, aus einem elektrisch leitenden oder nicht leitenden Metall bestehen kann, sondern beispielsweise auch aus Kunststoff hergestellt sein kann.In addition, it is mentioned that the hold-down element 25 can not only, as described in the exemplary embodiment, consist of an electrically conductive or non-conductive metal, but can for example also be made of plastic.

Bei dem in der Figur 4 dargestellten abgewandelten Ausführungsbeispiel der Erfindung sind das Niederhalteelement und der Hochspannungsanschluss als kombiniertes, einteiliges, aus leitendem Metall bestehendes Bauteil 36 ausgebildet. In diesem Fall entfällt der stiftförmige Entstörwiderstand 31. Um hier eine elektrische Kontaktierung der Sekundärwicklung 14 zum Bauteil 36 und somit zur Zündkerze zu bewirken, sind an der Kontakthülse 18a Kontaktrippen 24a vorgesehen, die radial nach außen ragend an der Kontakthülse 18a angeordnet sind. In diesem Fall wird die elektrische Verbindung derart hergestellt, dass beim Überschieben des Bauteils 36 auf die Kontakthülse 18a die Kontaktrippen 24a das Bauteil 36 an seiner Innenwandung elektrisch kontaktieren. Erfindungsgemäß ist jedoch auch bei diesem Ausführungsbeispiel die Länge des Bauteils 36 derart bemessen, dass dessen Einführbereich 37 die Kontaktlaschen 22a der Kontakthülse 18a in der Endposition des Bauteils 36 deutlich überdecken und eine von der Kontakthülse 18a ausgehende Ausbreitung von Rissen in dem lsolierharz außerhalb des Bauteils 36 somit vermieden werden kann.In the in the FIG. 4 illustrated modified embodiment of the invention, the hold-down element and the high voltage terminal as a combined, one-piece, consisting of conductive metal component 36 are formed. In this case, eliminates the pin-shaped Entstörwiderstand 31. In order to effect electrical contacting of the secondary winding 14 to the component 36 and thus to the spark plug, contact ribs 24a are provided on the contact sleeve 18a, which are arranged radially outwardly projecting on the contact sleeve 18a. In this case, the electrical connection is produced in such a way that, when the component 36 is pushed over onto the contact sleeve 18a, the contact ribs 24a make electrical contact with the component 36 on its inner wall. However, according to the invention is also in this Embodiment, the length of the component 36 such that its insertion 37 clearly overlap the contact tabs 22a of the contact sleeve 18a in the final position of the component 36 and thus emanating from the contact sleeve 18a propagation of cracks in the insulating resin outside of the component 36 can be avoided.

Claims (6)

  1. Ignition coil (10), in particular for an internal combustion engine of a motor vehicle, having a secondary winding (14), arranged on a coil former (13), for generating a high voltage at a spark plug, having a contact sleeve (18; 18a) which is in electrical contact with the secondary winding (14), can be fitted over an end region (17) of the coil former (13) and has at least one contact element (22; 22a) for the secondary winding (14), as well as having a retaining element (25; 36) which can be shifted over the contact sleeve (18; 18a) and acts on the at least one contact element (22; 22a) of the contact sleeve (28; 18a), wherein in its end position the retaining element (25; 36) projects, when considered in the axial direction of the coil former (13), beyond the at least one contact element (22; 22a) of the contact sleeve (18; 18a) and covers the at least one contact element (22; 22a), characterized in that the contact sleeve (18) has at least one contact element (24) which protrudes radially inward from an annular region (19) of the contact sleeve (18), and in that the at least one contact element (24) has an effective electrical connection to a suppression resistor (31) which is in turn connected to a high voltage terminal (32) which can be coupled to the spark plug.
  2. Ignition coil according to Claim 1, characterized in that the retaining element (25; 36) is of rounded design in its entry region (26; 37), on the side facing the coil former (13).
  3. Ignition coil according to Claim 2, characterized in that the retaining element (25) is composed of metal, and in that the entry region (26) is of flanged design.
  4. Ignition coil according to one of Claims 1 to 3, characterized in that the retaining element is an integral component of a high voltage terminal (36) for the spark plug.
  5. Ignition coil according to Claim 4, characterized in that the contact sleeve (18a) has at least one radially outwardly projecting contact element (24a) which can be placed in electrical contact with the high voltage terminal (36).
  6. Ignition coil according to one of Claims 1 to 5, characterized in that the contact sleeve (18; 18a) has clip-like contacts (22; 22a) for the secondary winding (14), and in that in its end position the retaining element (25; 36) projects beyond the contacts (22; 22a), when viewed in the direction of the coil former (13), in particular in that the region of the retaining element (25; 36) projecting beyond the contacts (22; 22a) projects beyond the contacts (22; 22a) by a third to a half of its length.
EP07727839A 2006-05-02 2007-04-05 Ignition coil for an internal combustion engine, in particular of a motor vehicle Active EP2016653B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006020170A DE102006020170A1 (en) 2006-05-02 2006-05-02 Ignition coil, in particular for an internal combustion engine of a motor vehicle
PCT/EP2007/053371 WO2007125008A1 (en) 2006-05-02 2007-04-05 Ignition coil for an internal combustion engine, in particular of a motor vehicle

Publications (2)

Publication Number Publication Date
EP2016653A1 EP2016653A1 (en) 2009-01-21
EP2016653B1 true EP2016653B1 (en) 2013-02-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07727839A Active EP2016653B1 (en) 2006-05-02 2007-04-05 Ignition coil for an internal combustion engine, in particular of a motor vehicle

Country Status (6)

Country Link
US (1) US8439023B2 (en)
EP (1) EP2016653B1 (en)
JP (1) JP4881431B2 (en)
CN (1) CN101432937B (en)
DE (1) DE102006020170A1 (en)
WO (1) WO2007125008A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4701835B2 (en) 2004-07-27 2011-06-15 株式会社デンソー Stick type ignition coil
US9356433B2 (en) 2012-05-10 2016-05-31 Denso International America, Inc. Ignition coil captured resistor
DE102012221897A1 (en) * 2012-11-29 2014-06-05 Robert Bosch Gmbh Electrical contact arrangement for contacting a coil

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JP3709934B2 (en) * 1996-10-18 2005-10-26 株式会社デンソー Ignition coil for internal combustion engine
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JPH11238637A (en) * 1998-02-23 1999-08-31 Toyota Motor Corp Ignition device
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Also Published As

Publication number Publication date
WO2007125008A1 (en) 2007-11-08
EP2016653A1 (en) 2009-01-21
CN101432937B (en) 2012-06-27
JP2009535828A (en) 2009-10-01
US20090301450A1 (en) 2009-12-10
JP4881431B2 (en) 2012-02-22
US8439023B2 (en) 2013-05-14
DE102006020170A1 (en) 2007-11-08
CN101432937A (en) 2009-05-13

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