EP1542246B1 - Bobine d'allumage - Google Patents

Bobine d'allumage Download PDF

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Publication number
EP1542246B1
EP1542246B1 EP04025607.5A EP04025607A EP1542246B1 EP 1542246 B1 EP1542246 B1 EP 1542246B1 EP 04025607 A EP04025607 A EP 04025607A EP 1542246 B1 EP1542246 B1 EP 1542246B1
Authority
EP
European Patent Office
Prior art keywords
core
ignition coil
electrically conductive
conductive plastic
section
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.)
Expired - Lifetime
Application number
EP04025607.5A
Other languages
German (de)
English (en)
Other versions
EP1542246A3 (fr
EP1542246A2 (fr
Inventor
Stefan Groezinger
Lothar Detels
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
Priority claimed from DE102004010173A external-priority patent/DE102004010173A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1542246A2 publication Critical patent/EP1542246A2/fr
Publication of EP1542246A3 publication Critical patent/EP1542246A3/fr
Application granted granted Critical
Publication of EP1542246B1 publication Critical patent/EP1542246B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01F27/34—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
    • 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

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 (see, eg US 5,349,320 ) is known from practice and in particular represents a Kompaktzündspule for controlling a spark plug or a multi-coil for controlling at least two spark plugs of a working according to the Otto principle motor vehicle 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 motor vehicle in question, is converted into magnetic energy, which at a desired time at which an ignition pulse is to be delivered to serving to ignite a fuel mixture in the combustion chamber of the internal combustion engine, in a High voltage pulse is implemented.
  • the known Kompaktzündspule comprises a generally made of plastic coil housing, in which a magnetically active, so-called I-core of ferromagnetic material, for example, iron, is arranged.
  • the I-core may for example be formed cuboid or rod-shaped and is of a first, with the DC power supply, ie connected to a supply voltage, so-called primary winding and of a second, connected to the spark plug, so-called secondary winding enclosed.
  • the two windings are usually made of copper wire.
  • the known Kompaktzündspule also formed of a ferroelectric material, 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 conversion of the voltage supplied by the DC on-board electrical system of the motor vehicle into a high voltage is such that a current flows through the primary winding, whereby a magnetic field is formed around this winding, which has a certain direction and is self-contained.
  • the built-up magnetic field is forced to turn by switching off the electric current, resulting in the secondary winding, which is formed close to the primary winding and has a much larger number of turns, 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.
  • Kompaktzündspulen is located on opposite sides of the ignition coil between the O-core and the ignition coil each an air gap through which partial discharges of the O-core can be done, which are caused by the resultant between the O-core and the ignition coil electric field.
  • the air gap between the O-core and the ignition coil may make so large that a sufficient endurance resistance of the ignition coil is ensured. This is due to a minimal air gap between the non-overmolded O-core and the coil housing caused by the insufficient adhesion of the O-core to the housing made of plastic. This in turn leads to a high potential difference and an associated partial discharge of the O-core.
  • the invention has for its object to provide an ignition coil of the aforementioned type, in which a sufficient endurance resistance is guaranteed.
  • the ignition coil according to the invention of an ignition system of an internal combustion engine with the features according to the preamble of claim 1, wherein the ignition coil between the coil housing and the peripheral core at least partially at least one electrically conductive plastic portion is arranged, which is electrically connected to the peripheral core and free of air gap adjacent to the coil housing, has the advantage that at least in the areas in which the at least one plastic section is arranged, can build up between the Missionskem or O-core and the coil housing not effective over air electric field and so in these areas no partial discharge of O Kerns on the coil housing and thus no material degradation takes place. Rather, there is a reduced partial discharge over the shortest available air gap between the O-core and the coil housing.
  • the electrically conductive plastic portion may be connected by application of a spraying process with the made of plastic coil housing so that no air gap is formed between these two components.
  • the connection can be produced, for example, such that first the at least one electrically conductive plastic section is molded onto the peripheral core and then the circumferential core provided with the electrically conductive plastic section is injected into the coil housing.
  • the electrically conductive plastic portion covers the inside of the peripheral core at least partially, and preferably at least at the points where excessive material degradation could lead to failure of the ignition coil.
  • an electrically conductive plastic section in a plurality of areas each representing a pivot point of the housing.
  • the electrically conductive plastic portion has, for example, a thickness between 0.1 mm and 2.5 mm and preferably of about 0.5 mm. But it is also possible to make the electrically conductive plastic portion thinner and applied in the form of an optionally partially formed, thin electrically conductive plastic layer on the peripheral core or on the housing.
  • the electrically conductive plastic portion has a substantially U-shaped cross-section. After injecting the peripheral core provided with the plastic section into the coil housing, the base region of the electrically conductive plastic section can then be spaced from the peripheral core via a minimal air gap for production purposes, whereas the flanks of the plastic section abut the peripheral core and produce the electrical connection required for the potential equalization.
  • the electrically conductive plastic portion is thus arranged in a clip-like manner on the inside of the peripheral core and formed as a plastic body in this case.
  • an ignition coil 10 of an otherwise not shown ignition system of an engine designed as a gasoline engine of a motor vehicle is shown.
  • 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 embodied as a compact ignition coil comprises a housing 12, which is made of an electrically insulating plastic 12 and in which a soft magnetic cuboid I-core 14 is arranged in a central position, which consists of a packetized sheet metal or layered electrical sheet.
  • the primary winding 18 is surrounded by a concentrically arranged, second bobbin 21, on which a copper wire formed, so-called secondary winding 22 is wound, which is connected to a connectable to the respective spark plug high-voltage terminal 24 of the ignition coil 10.
  • the I-core, the primary winding 18, the bobbin 21 and the secondary winding 22 form a structural unit, which is poured into casting resin not shown here in detail and is thus fixed in the housing 12.
  • the housing 12 is further surrounded at the level of the I-core 14 by a so-called peripheral core or O-core 26, which is also made of packetized sheet metal and is connected to the I-core to form a magnetic circuit.
  • O-core 26 At its side remote from the low-voltage connection 20, the O-core 26 has a screw-on eye 27, which serves for grounding.
  • the O-core 26 has a substantially rectangular floor plan and carries on its inside a plastic portion 28 formed of an electrically conductive plastic, which has a substantially U-shaped ground plan and a substantially U-shaped cross-section whose flanks form-fitting with the O -Kern 26 are in communication, so that an electrical contact between the O-core 26 and the plastic portion 28 is ensured.
  • the plastic portion 28 is due to the production spaced over a minimum air gap to the O-core.
  • the plastic section 28 molded onto the O-core 26 has, for example, a thickness of approximately 0.5 mm and is positively connected to the housing 12, ie. H. connected without air gap.
  • the electrically conductive plastic portion 28 may be formed in the form of an independent plastic body and locked, for example, as a prefabricated clip on the inside of the O-core 28.
  • the plastic portion 28 may also be formed in the form of a plastic layer, for example, by vapor deposition or by galvanic means, on the housing or the peripheral core.

Landscapes

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

Claims (8)

  1. Bobine d'allumage d'une installation d'allumage d'un moteur à combustion interne, comprenant un boîtier de bobine (12) fabriqué en plastique isolant, un noyau en I (14) à action magnétique qui est entouré par un premier enroulement de bobine (18) connecté à une tension d'alimentation et un deuxième enroulement de bobine (22) connecté à un raccord haute tension, ainsi qu'un noyau périphérique (26) formant un circuit magnétique avec le noyau en I (14), entourant l'agencement constitué du premier (18) et du deuxième (22) enroulement de bobine, caractérisée en ce qu'entre le boîtier de bobine (12) et le noyau périphérique (26) est disposée au moins en partie au moins une portion en plastique électriquement conductrice (28) qui est connectée électriquement au noyau périphérique et est adjacente au boîtier de bobine (12) essentiellement sans entrefer.
  2. Bobine d'allumage selon la revendication 1, caractérisée en ce que la portion en plastique électriquement conductrice (28) recouvre au moins en partie le côté intérieur du noyau périphérique (26).
  3. Bobine d'allumage selon la revendication 1 ou 2, caractérisée en ce que la portion en plastique électriquement conductrice (28) présente une section transversale essentiellement en forme de U, dont les flancs sont connectés par engagement par correspondance de formes au noyau périphérique.
  4. Bobine d'allumage selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la portion en plastique électriquement conductrice (28) est disposée au niveau du noyau périphérique (26).
  5. Bobine d'allumage selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la portion en plastique électriquement conductrice (28) est disposée au niveau du boîtier (12).
  6. Bobine d'allumage selon l'une quelconque des revendications 1 à 5, caractérisée en ce que la portion en plastique électriquement conductrice (28) présente une épaisseur comprise entre 0,1 mm et 2,5 mm, de préférence d'environ 0,5 mm.
  7. Bobine d'allumage selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la portion en plastique électriquement conductrice (28) est réalisée sous forme de corps en plastique.
  8. Bobine d'allumage selon l'une quelconque des revendications 1 à 6, caractérisée en ce que la portion en plastique électriquement conductrice (28) est réalisée sous forme de couche en plastique.
EP04025607.5A 2003-12-09 2004-10-28 Bobine d'allumage Expired - Lifetime EP1542246B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10357351 2003-12-09
DE10357351 2003-12-09
DE102004010173 2004-03-02
DE102004010173A DE102004010173A1 (de) 2004-03-02 2004-03-02 Zündspule

Publications (3)

Publication Number Publication Date
EP1542246A2 EP1542246A2 (fr) 2005-06-15
EP1542246A3 EP1542246A3 (fr) 2011-11-16
EP1542246B1 true EP1542246B1 (fr) 2015-03-04

Family

ID=34524063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04025607.5A Expired - Lifetime EP1542246B1 (fr) 2003-12-09 2004-10-28 Bobine d'allumage

Country Status (2)

Country Link
EP (1) EP1542246B1 (fr)
JP (1) JP4732742B2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007010602A1 (fr) * 2005-07-20 2007-01-25 Mitsubishi Denki Kabushiki Kaisha Coupleur par induction d'un système de communication à porteuse sur ligne de transport d'énergie
JP4410198B2 (ja) * 2006-02-07 2010-02-03 三菱電機株式会社 内燃機関用点火装置
DE102008040146B4 (de) 2007-07-04 2023-03-30 Denso Corporation Zündspule
KR101560738B1 (ko) 2009-02-11 2015-10-16 삼성전자 주식회사 유기 에어로젤, 이의 형성용 조성물 및 이의 제조방법
CN106128730B (zh) * 2016-07-21 2018-10-23 昆山凯迪汽车电器有限公司 点火线圈

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61137309A (ja) * 1984-12-08 1986-06-25 Nissin Electric Co Ltd ガス絶縁計器用変圧器
JPS63119211A (ja) * 1986-11-07 1988-05-23 Hitachi Ltd 内燃機関用点火コイル
FR2657995B1 (fr) * 1990-02-07 1994-08-05 Valeo Electronique Bobine d'allumage, notamment pour moteur a combustion interne de vehicule automobile.
JP2981702B2 (ja) * 1992-08-27 1999-11-22 愛三工業株式会社 内燃機関用点火コイル
JPH07326531A (ja) * 1994-05-31 1995-12-12 Murata Mfg Co Ltd フライバックトランス
JPH0982538A (ja) * 1995-09-19 1997-03-28 Hitachi Ltd 内燃機関用点火コイル

Also Published As

Publication number Publication date
JP4732742B2 (ja) 2011-07-27
EP1542246A3 (fr) 2011-11-16
EP1542246A2 (fr) 2005-06-15
JP2005175470A (ja) 2005-06-30

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