EP0915487A1 - Ignition coil with rod-shaped core - Google Patents

Ignition coil with rod-shaped core Download PDF

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Publication number
EP0915487A1
EP0915487A1 EP98111927A EP98111927A EP0915487A1 EP 0915487 A1 EP0915487 A1 EP 0915487A1 EP 98111927 A EP98111927 A EP 98111927A EP 98111927 A EP98111927 A EP 98111927A EP 0915487 A1 EP0915487 A1 EP 0915487A1
Authority
EP
European Patent Office
Prior art keywords
core
rod
coil
coil according
contact element
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Withdrawn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
EP98111927A
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German (de)
French (fr)
Inventor
Christian Bonnefoit
Reinhard Seidl
Lothar Detels
Christoph Maerz
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
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0915487A1 publication Critical patent/EP0915487A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention is based on a rod coil for ignition systems, especially as an ignition coil in internal combustion engines from Motor vehicles according to the preamble of claim 1.
  • a rod coil is known from DE 41 32 851 A1 has a cylindrical housing in the basic form. To the A primary connection with contact elements is attached to the housing, the electrical with winding ends one in the housing arranged coil set of the ignition coil are connected.
  • a rod-shaped core of an open Magnetic circuit arranged in the housing and inside the coil set.
  • the rod coil according to the invention for ignition systems with the characteristic features of claim 1 has the opposite the advantage that the aforementioned inadequacy is avoided.
  • the rod coil is designed so that the core electrically via a contact element of a primary connection is connected to ground potential and that in the Core coupled interference energy is derived. This is the risk of malfunctions in electrical units of the motor vehicle reduced.
  • FIG. 1 An embodiment of the invention is in the drawing shown and explained in more detail in the figure description.
  • the figure shows a section of the ignition coil in one Partial cut.
  • a rod coil 11 for ignition systems in particular as an ignition coil in internal combustion engines of motor vehicles Direct contact with a spark plug provided in usual and no longer shown in a shaft is used in the cylinder head of an internal combustion engine.
  • the rod coil 11 contains a coaxial arrangement Longitudinal axis 12 in a housing 13 made of plastic elongated, cylindrical core 14, also called an I-core referred to as.
  • the core 14 consists of layered magnetic material and is part of an open Magnetic circuit. Concentric around the core 14 is inside a low-voltage primary winding 16 and external a secondary winding 17 carrying high voltage arranged.
  • the windings 16, 17 are for guiding the Magnetic field surrounded by a yoke plate 15, the is mounted on the inside of the housing 13.
  • the back plate 15 is slotted parallel to the longitudinal axis 12 by one To prevent short circuit of the magnetic field.
  • the primary connection 18 has in addition another a first contact element 19, which is electrically Ground potential is.
  • This first contact element 19 is Part of a busbar 21 designed as a sheet metal strip, which projects into the housing 13 with a free end 22, that the free end 22 of an end face 23 of the core 14 with short distance opposite. This distance is through an electrically conductive spring element 24, here exemplified as a leaf spring, non-positive bridged.
  • the spring element 24 acts on the one hand as an electrical bridge between the core 14 and the first contact element 19 and on the other hand as a mechanical buffer for changes in length to compensate for the core 14 at changing temperatures. So can the interference energy originating from the ignition processes, the from the secondary winding 17 to the primary winding 16 and of this is capacitively coupled to the core 14, of this also under changing operating conditions Mass can be derived.

Abstract

The bar coil has a housing (13) in which a core (14) is mounted as part of an open magnetic circuit. A primary terminal (18) with two or more contact elements (19) is provided for low voltage supply. The core is connected to a first contact element, which is at earth potential.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Stabspule für Zündanlagen, insbesondere als Zündspule in Brennkraftmaschinen von Kraftfahrzeugen nach der Gattung des Anspruchs 1.The invention is based on a rod coil for ignition systems, especially as an ignition coil in internal combustion engines from Motor vehicles according to the preamble of claim 1.

Durch die DE 41 32 851 A1 ist eine Stabspule bekannt, die ein in der Grundform zylindrisches Gehäuse aufweist. An dem Gehäuse ist ein Primäranschluß mit Kontaktelementen angefügt, die elektrisch mit Wicklungsenden eines im Gehäuse angeordneten Spulensatzes der Zündspule verbunden sind.A rod coil is known from DE 41 32 851 A1 has a cylindrical housing in the basic form. To the A primary connection with contact elements is attached to the housing, the electrical with winding ends one in the housing arranged coil set of the ignition coil are connected.

In dem Gehäuse und innerhalb des Spulensatzes ist in zentraler Lage ein stabförmiger Kern eines offenen Magnetkreises angeordnet.In the housing and inside the coil set is in central location a rod-shaped core of an open Magnetic circuit arranged.

Beim Betrieb der Zündspule tritt eine aus den Zündvorgängen stammende Störenergie auf, die über induktive und kapazitive Kopplung am Primäranschluß anliegt. Diese Störenergie ist, bedingt durch die Bauart der Stabspule, höher als bei einer konventionellen Zündspule mit einem über das Kernmaterial geschlossenen Magnetkreis. Durch die erhöhte Störenergie, die sich über den Primäranschluß und den daran angeschlossenen Leitungen in das Bordnetz des Kraftfahrzeugs ausbreiten kann, kann es in anderen elektrischen Komponenten des Kraftfahrzeugs, wie in einem Steuergerät oder in einem Rundfunkempfänger zu unerwünschten Funktionsbeeinträchtigungen kommen.One comes out of the ignition processes when the ignition coil is operating Interfering energy originating from inductive and capacitive Coupling is present at the primary connection. This interference energy is due to the design of the rod coil, higher than one conventional ignition coil with one over the core material closed magnetic circuit. Due to the increased interference energy that spreads over the Primary connection and the connected lines in can spread the vehicle electrical system, it can in other electrical components of the motor vehicle, as in a control unit or in a radio receiver undesirable functional impairments.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Stabspule für Zündanlagen mit den kennzeichnenden Merkmalen des Anspruchs 1 hat dem gegenüber den Vorteil, daß die zuvor erwähnte Unzulänglichkeit vermieden wird. Dazu ist die Stabspule so ausgebildet, daß der Kern elektrisch über ein Kontaktelement eines Primäranschlusses auf Massepotential gelegt ist und die in den Kern eingekoppelte Störenergie abgeleitet wird. Dadurch ist die Gefahr von Funktionsstörungen in elektrischen Aggregaten des Kraftfahrzeugs vermindert.The rod coil according to the invention for ignition systems with the characteristic features of claim 1 has the opposite the advantage that the aforementioned inadequacy is avoided. For this purpose, the rod coil is designed so that the core electrically via a contact element of a primary connection is connected to ground potential and that in the Core coupled interference energy is derived. This is the risk of malfunctions in electrical units of the motor vehicle reduced.

In den Unteransprüchen sind vorteilhafte Ausgestaltungen für die Realisierung der Erfindung angegeben.Advantageous refinements for are in the dependent claims stated the realization of the invention.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der Figurenbeschreibung näher erläutert. Die Figur zeigt die Zündspule ausschnittsweise in einem Teilschnitt.An embodiment of the invention is in the drawing shown and explained in more detail in the figure description. The figure shows a section of the ignition coil in one Partial cut.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Eine Stabspule 11 für Zündanlagen, insbesondere als Zündspule in Brennkraftmaschinen von Kraftfahrzeugen, ist zur Direktkontaktierung mit einer Zündkerze vorgesehen, die in üblicher und nicht mehr dargestellter Weise in einem Schacht im Zylinderkopf einer Brennkraftmaschine eingesetzt ist.A rod coil 11 for ignition systems, in particular as an ignition coil in internal combustion engines of motor vehicles Direct contact with a spark plug provided in usual and no longer shown in a shaft is used in the cylinder head of an internal combustion engine.

Die Stabspule 11 enthält in koaxialer Anordnung zu einer Längsachse 12 in einem Gehäuse 13 aus Kunststoff einen länglichen, zylindrischen Kern 14, der auch als I-Kern bezeichnet wird. Der Kern 14 besteht aus geschichtetem magnetischen Material und ist Teil eines offenen Magnetkreises. Konzentrisch um den Kern 14 ist innenliegend eine Niederspannung führende Primärwicklung 16 und außenliegend eine Hochspannung führende Sekundärwicklung 17 angeordnet. Die Wicklungen 16, 17 sind zur Führung des Magnetfeldes von einem Rückschlußblech 15 umgeben, das innenseitig an dem Gehäuse 13 gelagert ist. Das Rückschlußblech 15 ist parallel zur Längsachse 12 geschlitzt, um einen Kurzschluß des Magnetfeldes zu verhindern.The rod coil 11 contains a coaxial arrangement Longitudinal axis 12 in a housing 13 made of plastic elongated, cylindrical core 14, also called an I-core referred to as. The core 14 consists of layered magnetic material and is part of an open Magnetic circuit. Concentric around the core 14 is inside a low-voltage primary winding 16 and external a secondary winding 17 carrying high voltage arranged. The windings 16, 17 are for guiding the Magnetic field surrounded by a yoke plate 15, the is mounted on the inside of the housing 13. The back plate 15 is slotted parallel to the longitudinal axis 12 by one To prevent short circuit of the magnetic field.

An einem Ende der Stabspule 11 ist einteilig mit dem Gehäuse 13 ein Steckerkörper als Teil eines Primäranschluß 18 der Stabspule 11 ausgebildet. Der Primäranschluß 18 weist neben anderen ein erstes Kontaktelement 19 auf, das elektrisch auf Massepotential liegt. Dieses erste Kontaktelement 19 ist Teil einer als Blechstreifen ausgebildeten Stromschiene 21, die mit einem freien Ende 22 derart in das Gehäuse 13 ragt, daß das freie Ende 22 einer Stirnfläche 23 des Kerns 14 mit geringem Abstand gegenüber liegt. Dieser Abstand ist durch ein elektrisch leitfähiges Federelement 24, hier beispielhaft als Blattfeder ausgeführt, kraftschlüssig überbrückt.At one end of the rod coil 11 is in one piece with the housing 13 a connector body as part of a primary connection 18 Rod coil 11 formed. The primary connection 18 has in addition another a first contact element 19, which is electrically Ground potential is. This first contact element 19 is Part of a busbar 21 designed as a sheet metal strip, which projects into the housing 13 with a free end 22, that the free end 22 of an end face 23 of the core 14 with short distance opposite. This distance is through an electrically conductive spring element 24, here exemplified as a leaf spring, non-positive bridged.

Das Federelement 24 wirkt einerseits als elektrische Brücke zwischen dem Kern 14 und dem ersten Kontaktelement 19 und andererseits als mechanischer Puffer, um Längenänderungen des Kerns 14 bei wechselnden Temperaturen auszugleichen. So kann die aus den Zündvorgängen stammende Störenergie, die von der Sekundärwicklung 17 auf die Primärwicklung 16 und von dieser kapazitiv auf den Kern 14 gekoppelt wird, von diesem auch unter wechselnden Betriebsverhältnissen zur Masse abgeleitet werden.The spring element 24 acts on the one hand as an electrical bridge between the core 14 and the first contact element 19 and on the other hand as a mechanical buffer for changes in length to compensate for the core 14 at changing temperatures. So can the interference energy originating from the ignition processes, the from the secondary winding 17 to the primary winding 16 and of this is capacitively coupled to the core 14, of this also under changing operating conditions Mass can be derived.

Claims (5)

Stabspule für Zündanlagen, insbesondere als Zündspule in Brennkraftmaschinen von Kraftfahrzeugen, mit einem Gehäuse (13), in dem ein Kern (14) als Teil eines offenen Magnetkreises gelagert und an dem ein Primäranschluß (18) mit wenigstens zwei Kontaktelementen zum Zuführen einer Niederspannung angebracht ist, dadurch gekennzeichnet, daß der Kern (14) elektrisch mit einem ersten Kontaktelement (19), das elektrisch auf Massepotential liegt, verbunden ist.Rod coil for ignition systems, especially as an ignition coil in Internal combustion engines of motor vehicles, with a housing (13) in which a core (14) as part of an open magnetic circuit stored and on which a primary connection (18) with at least two contact elements for supplying a low voltage is attached, characterized in that the Core (14) electrically with a first contact element (19), which is electrically connected to ground potential. Stabspule nach Anspruch 1, dadurch gekennzeichnet, daß der Kern (14) als ein aus geschichtetem magnetisierbaren Material bestehender I-Kern ausgebildet ist.Bar coil according to claim 1, characterized in that the core (14) as a layered magnetizable Material existing I core is formed. Stabspule nach Anspruch 2, dadurch gekennziechnet, daß an dem Kern (14) stirnseitig ein elektrisch leitfähiges Federelement (24) anliegt, das elektrisch leitend in Kraftschluß mit dem ersten Kontaktelement (19) steht.Rod coil according to claim 2, characterized in that an electrically conductive spring element on the face of the core (14) (24) is present, the electrically conductive frictional connection with the first contact element (19). Stabspule nach Anspruch 3, dadurch gekennzeichnet, daß das Federelement (24) als eine metallische Blattfeder ausgebildet ist.Bar coil according to claim 3, characterized in that the spring element (24) is designed as a metallic leaf spring is. Stabspule nach Anspruch 4, dadurch gekennzeichnet, daß das erste Kontaktelement (19) ein Teil einer Stromschiene (21) ist.Bar coil according to claim 4, characterized in that the first contact element (19) is part of a busbar (21) is.
EP98111927A 1997-11-06 1998-06-27 Ignition coil with rod-shaped core Withdrawn EP0915487A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29719693U DE29719693U1 (en) 1997-11-06 1997-11-06 Rod coil for ignition systems
DE29719693U 1997-11-06

Publications (1)

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EP0915487A1 true EP0915487A1 (en) 1999-05-12

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EP98111927A Withdrawn EP0915487A1 (en) 1997-11-06 1998-06-27 Ignition coil with rod-shaped core

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EP (1) EP0915487A1 (en)
JP (1) JP3058874U (en)
DE (1) DE29719693U1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05175058A (en) * 1991-12-19 1993-07-13 Aisan Ind Co Ltd Ignition coil for internal combustion engine
DE19609655A1 (en) * 1995-05-08 1996-11-14 Mitsubishi Electric Corp Ignition coil unit for IC engine use

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05175058A (en) * 1991-12-19 1993-07-13 Aisan Ind Co Ltd Ignition coil for internal combustion engine
DE19609655A1 (en) * 1995-05-08 1996-11-14 Mitsubishi Electric Corp Ignition coil unit for IC engine use

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 579 (E - 1451) 21 October 1993 (1993-10-21) *

Also Published As

Publication number Publication date
DE29719693U1 (en) 1999-04-01
JP3058874U (en) 1999-06-22

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