EP1694960B1 - Bobine d'allumage - Google Patents

Bobine d'allumage Download PDF

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Publication number
EP1694960B1
EP1694960B1 EP04798138A EP04798138A EP1694960B1 EP 1694960 B1 EP1694960 B1 EP 1694960B1 EP 04798138 A EP04798138 A EP 04798138A EP 04798138 A EP04798138 A EP 04798138A EP 1694960 B1 EP1694960 B1 EP 1694960B1
Authority
EP
European Patent Office
Prior art keywords
ignition coil
core
electrically conductive
ignition
winding
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
EP04798138A
Other languages
German (de)
English (en)
Other versions
EP1694960A1 (fr
Inventor
Stefan GRÖZINGER
Reinhard Seidl
Lothar Detels
Markus Weimert
Tim Skowronek
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 EP1694960A1 publication Critical patent/EP1694960A1/fr
Application granted granted Critical
Publication of EP1694960B1 publication Critical patent/EP1694960B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating

Definitions

  • the invention is based on an ignition coil of an ignition system of an internal combustion engine according to the closer defined in the preamble of claim 1. Art.
  • Such an ignition coil is known from practice and is used in particular for controlling a spark plug of a working according to the Otto principle motor vehicle internal combustion engine.
  • the ignition coil forms an energy storage and transformer, by means of which electrical energy of a comparatively low supply voltage, which is usually provided by a DC electrical system of the respective motor vehicle, is converted into magnetic energy, which at a desired time, to which an ignition pulse to a Ignition of a fuel mixture in the combustion chamber of the internal combustion engine serving spark plug is to be delivered, is converted into a high voltage pulse.
  • the known ignition coil comprises a housing in which a magnetically active core of ferromagnetic material, for example iron, is arranged.
  • the core is of a first, so-called primary winding connected to a supply voltage and a second, so-called connected to a high voltage terminal of the ignition coil Enclosed secondary winding.
  • the two windings are usually made of copper wire.
  • Such an ignition coil is from the US 2002/158740 or the WO 97/22981 known.
  • a current flows through the primary winding, through which a magnetic field surrounding this winding and which is closed and has a certain direction is produced.
  • the electric current is switched off, so that the built-up magnetic field is forced to change direction.
  • the secondary winding which is formed close to the primary winding and has a much larger number of turns than the secondary winding, a high electrical voltage.
  • the ignition coil discharges.
  • the high voltage, a spark current and a spark duration in the ignition of the fuel mixture fed into the combustion chamber of the internal combustion engine can be adapted to the respective requirements.
  • the high voltage generated in it is insulated against other electrically conductive parts
  • the electrical insulation of the secondary or high voltage winding is usually done by means of electrically insulating materials and / or through air gaps to other electrically conductive parts , If such insulation is insufficient, there may be a so-called electrical shunt or electrical breakdown from the high-voltage winding to another electrically conductive component of the ignition coil. This has the consequence that only a reduced high voltage is available at the high voltage terminal of the ignition coil, which is generally no longer sufficient to carry out a reliable ignition of the spark plug.
  • critical components of the ignition coil may be the windings and in particular components of the magnetically active core.
  • the core is usually grounded, leaving between the high-voltage secondary winding and the magnetically active core is given a large electric potential difference.
  • the risk of electrical breakdown is determined not only by the potential difference but also by the electric field strength, which is applied between the high-voltage winding and the respective electrically conductive component.
  • the electric field strength is strongly dependent on the existing geometric conditions. In particular angular or even pointed surface contours of the respective component lead physically to local field strength increases, which in turn favor an electrical breakdown. Corners, tips or even edges on electrically conductive parts, which are arranged in the area of influence of the high voltage, therefore represent a potential risk with regard to an electrical breakdown in the case of an ignition coil.
  • the magnetically active core usually consists of stamped individual sheets, which are packaged in a stack of certain height.
  • the stack has in particular on its flanks numerous angular or sharp bumps that can lead to strong field peaks during operation of the ignition coil and thereby to a breakdown.
  • electrical breakdowns so far correspondingly large isolation distances have been maintained or, if possible, used according to good insulation materials.
  • the invention has for its object to provide an ignition coil of the aforementioned type, in which despite the presence of a rough surface on an electrically conductive component is a low risk of electrical breakdown and which can be realized with a small size.
  • the ignition coil according to the invention of an ignition system of an internal combustion engine with the features of claim 1, wherein the ignition coil is provided at least one electrically conductive component with an electrically conductive plastic filling for electrically effective leveling of its surface, has the advantage that design-related, an electrical breakdown favoring bumps, such as corners, edges, ridges or the like, are balanced on the electrically conductive component and the risk of electrical breakdown is minimized.
  • the electrically conductive sheath has a smooth surface.
  • This enclosure is an easy to apply means to a rough surface of the electrically conductive component, d. H. its unevenness to cover or shield in an electrically effective manner.
  • the envelope thus significantly reduces resulting from unevenness of the electrically conductive component field strength peaks. As a result, the risk of electrical breakdown between a component carrying high voltage and the component provided with the envelope is reduced.
  • the electrically conductive sheath is formed only in those areas of the electrically conductive component which have unevenness and thus harbor the risk of breakdowns.
  • the sheath is sprayed onto the relevant electrically conductive component.
  • the coating of the electrically conductive plastic for example, has a thickness between 0.1 mm and 1 mm, and preferably of 0.5 mm.
  • the electrically conductive component of the magnetically active core of the ignition coil which is usually formed of a laminated core, which is constructed of stamped individual sheets and therefore at its edges corners, edges, burrs or the like may have.
  • the ignition coil according to the invention is designed for example as Kompaktzündspule having a so-called I-core and a so-called peripheral core or O-core, which forms a magnetic circuit with the I-core and encloses the arrangement of the primary winding and the secondary winding ,
  • the component provided with the means for leveling the surface may be the I-core and / or the peripheral core.
  • the ignition coil 10 is used to supply a spark plug also not shown here with high-voltage pulses, so that an air / fuel mixture contained in the combustion chamber of the internal combustion engine can be ignited.
  • the ignition coil 10 is a Kompaktzündspule and comprises a made of an electrically insulating plastic housing 12 in which in a central position, a soft magnetic, cuboid I-core 14 is arranged.
  • the magnetically active I-core 14 is surrounded by a resin consisting of insulator 16, which serves as a bobbin for a formed of copper wire, so-called primary winding 18, which is connected via a low voltage terminal 20 to a DC voltage network of the motor vehicle and so with a DC voltage of For example, 12 V can be supplied.
  • the primary winding 18 is in turn surrounded by a bobbin 22 which serves as a support for a so-called secondary winding 24, which is in operation at high voltage and connected to a high voltage terminal 26, which serves for connection to a spark plug.
  • the I-core 14, the bobbin 16, the primary winding 18, the bobbin 22 and the secondary winding 24 form a structural unit which is poured into the resin for fixing in the housing 12 in a manner not shown here
  • the housing 12 is surrounded by a so-called O-core or peripheral core 28, which consists of a laminated core, d. H. layered iron sheet, is formed and connected to the I-core 14 to form a magnetic circuit
  • O-core has on its side remote from the low-voltage terminal 20 side a so-called Anschraubauge 30, which serves for grounding.
  • the O-core 28 On its inner side, ie on its side facing the secondary winding 24, the O-core 28 is provided with a sprayed, electrically conductive plastic sheath 31 which adjoins the housing 12 via a smooth surface and as a means for electrically leveling the inside surface of the housing Sheet core performing O-core 28 is used.
  • the envelope 31 has a thickness of about 0.5 mm.
  • FIG. 3 shows a schematic, general representation of the conditions in an ignition coil 32 according to the invention and illustrates the resulting by a plastic sheath "electrical leveling" of otherwise resulting from the edges of the iron core field peaks, by which the risk of electrical breakdown would be much higher.
  • a plastic sheath can be used in Kompaktzündspulen, but also for example in pencil ignition coils.
  • the ignition coil 32 has a magnetically active iron core 37, which is formed from a laminated core.
  • the iron core 37 has an edge 33 formed with edges and is enclosed by a casing 34 made of electrically conductive plastic, which has a smooth surface and constitutes a means for electrically flattening the flank 33.
  • the sheath 34 is provided with radii.
  • the iron core 37 and the sheath 34 are in turn embedded in an insulating material 35, which consists for example of cast resin
  • the iron core 37 cooperates with a secondary or high voltage winding 36, from the in FIG. 3 the outer winding layer is shown and which is connected to a high voltage terminal, and a low voltage or primary winding together, in FIG. 3 is not shown in detail and is connected to a low voltage connection

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

L'invention concerne une bobine d'allumage de moteur à combustion interne, comprenant un boîtier (12), un noyau (14, 28) à effet magnétique, un premier enroulement de bobine (18) relié à une tension d'alimentation et un second enroulement de bobine (24) relié à une connexion haute tension. Selon l'invention, au moins un composant électroconducteur (28) est muni, au moins par endroits, d'un moyen (31) permettant de niveler sa surface, de manière électriquement efficace.

Claims (4)

  1. Bobine d'allumage (10) d'une installation d'allumage d'un moteur à combustion interne, comprenant un boîtier (12), un noyau interne à action magnétique (14 ; 37), qui est entouré par un enroulement primaire (18) et par un enroulement secondaire (24), ainsi qu'un noyau externe à action magnétique (28), au moins le noyau interne (14 ; 37), l'enroulement primaire (18) et l'enroulement secondaire (24) étant entourés par une résine coulée en vue de la fixation dans le boîtier (12), caractérisée en ce que le noyau interne (14 ; 37), respectivement le noyau externe (28), est entouré par une gaine en plastique électriquement conductrice (31 ; 34) au moins du côté tourné vers l'enroulement primaire (18), respectivement vers l'enroulement secondaire (24), et en ce que la gaine en plastique (31 ; 34) est pulvérisée sous forme de revêtement sur le noyau interne (14 ; 37), respectivement sur le noyau externe (28).
  2. Bobine d'allumage selon la revendication 1, caractérisée en ce que l'épaisseur de la gaine en plastique (31 ; 34) est comprise entre 0,1 et 1,0 mm, de préférence vaut 0,5 mm.
  3. Bobine d'allumage selon la revendication 1 ou 2, caractérisée en ce que la gaine en plastique (31 ; 34) sur le côté tourné vers l'enroulement primaire (18), respectivement l'enroulement secondaire (24), présente une surface lisse.
  4. Bobine d'allumage selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le noyau interne (14 ; 37), respectivement le noyau externe (28), se compose d'un paquet de tôles avec plusieurs tôles individuelles estampées.
EP04798138A 2003-12-09 2004-11-02 Bobine d'allumage Active EP1694960B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10357349A DE10357349A1 (de) 2003-12-09 2003-12-09 Zündspule
PCT/EP2004/052753 WO2005059355A1 (fr) 2003-12-09 2004-11-02 Bobine d'allumage

Publications (2)

Publication Number Publication Date
EP1694960A1 EP1694960A1 (fr) 2006-08-30
EP1694960B1 true EP1694960B1 (fr) 2011-01-26

Family

ID=34638501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04798138A Active EP1694960B1 (fr) 2003-12-09 2004-11-02 Bobine d'allumage

Country Status (5)

Country Link
US (1) US7911305B2 (fr)
EP (1) EP1694960B1 (fr)
JP (1) JP2006514219A (fr)
DE (2) DE10357349A1 (fr)
WO (1) WO2005059355A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006019296A1 (de) * 2006-04-26 2007-10-31 Robert Bosch Gmbh Zündspule, insbesondere für eine Brennkraftmaschine eines Kraftfahrzeugs
DE102006025073A1 (de) * 2006-05-30 2007-12-06 Robert Bosch Gmbh Zündspule
DE102006044435A1 (de) * 2006-09-21 2008-03-27 Robert Bosch Gmbh Vorrichtung zur Energiespeicherung und Energietransformierung
JP2009260122A (ja) * 2008-04-18 2009-11-05 Kyocera Chemical Corp 高電圧コイルおよびその製造方法
DE102018101235A1 (de) * 2018-01-19 2019-07-25 Borgwarner Ludwigsburg Gmbh Zündspule und Verfahren zum Herstellen einer Zündspule

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440865A1 (fr) * 1990-02-09 1991-08-14 Asea Brown Boveri Ab Isolation électrique
JPH05175058A (ja) 1991-12-19 1993-07-13 Aisan Ind Co Ltd 内燃機関用点火コイル
JP3165017B2 (ja) 1995-12-15 2001-05-14 株式会社日立製作所 内燃機関用点火装置
US5703462A (en) * 1996-07-15 1997-12-30 Delco Electronics Corp. Inductive coupler assembly having its primary winding formed in a printed wiring board
JP3473817B2 (ja) 1996-10-18 2003-12-08 株式会社デンソー 内燃機関用点火コイル
KR100418005B1 (ko) * 1997-05-23 2004-02-14 가부시끼가이샤 히다찌 카 엔지니어링 엔진의 점화 장치
US6119667A (en) * 1999-07-22 2000-09-19 Delphi Technologies, Inc. Integrated spark plug ignition coil with pressure sensor for an internal combustion engine
US6232863B1 (en) * 2000-03-03 2001-05-15 Delphi Technologies, Inc. Spool assembly for an ignition coil
EP1162367B1 (fr) * 2000-06-06 2002-12-18 Federal-Mogul Ignition Srl Bobine d'allumage, pour véhicules automobile
JP3702802B2 (ja) 2001-03-15 2005-10-05 株式会社デンソー 内燃機関用点火コイル
US6522232B2 (en) * 2001-04-26 2003-02-18 Delphi Technologies, Inc. Ignition apparatus having reduced electric field HV terminal arrangement
JP2005072547A (ja) * 2002-12-05 2005-03-17 Denso Corp 点火コイルおよびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
US20070256655A1 (en) 2007-11-08
WO2005059355A1 (fr) 2005-06-30
JP2006514219A (ja) 2006-04-27
DE502004012154D1 (de) 2011-03-10
US7911305B2 (en) 2011-03-22
DE10357349A1 (de) 2005-07-07
EP1694960A1 (fr) 2006-08-30

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