EP1694960A1 - Bobine d'allumage - Google Patents

Bobine d'allumage

Info

Publication number
EP1694960A1
EP1694960A1 EP04798138A EP04798138A EP1694960A1 EP 1694960 A1 EP1694960 A1 EP 1694960A1 EP 04798138 A EP04798138 A EP 04798138A EP 04798138 A EP04798138 A EP 04798138A EP 1694960 A1 EP1694960 A1 EP 1694960A1
Authority
EP
European Patent Office
Prior art keywords
ignition coil
electrically conductive
core
ignition
voltage
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.)
Granted
Application number
EP04798138A
Other languages
German (de)
English (en)
Other versions
EP1694960B1 (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
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 EP1694960A1 publication Critical patent/EP1694960A1/fr
Application granted granted Critical
Publication of EP1694960B1 publication Critical patent/EP1694960B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 type defined in more detail in the preamble of claim 1.
  • Such an ignition coil is known from practice and is used, in particular, to control a spark plug of an automotive internal combustion engine that works according to the Otto principle.
  • the ignition coil forms an energy storage device and transformer, by means of which electrical energy of a comparatively low supply voltage, which is generally provided by a DC electrical system of the motor vehicle in question, is converted into magnetic energy which is generated at a desired point in time at which an ignition pulse is applied to the Ignition of a fuel mixture to be emitted in the combustion chamber of the internal combustion engine serving spark plug is converted into a high voltage pulse.
  • the known ignition coil comprises a housing in which a magnetically active core made of ferromagnetic material, for example made of iron, is arranged.
  • the core is composed of a first so-called primary winding connected to a supply voltage and a second so-called one connected to a high-voltage connection of the ignition coil Secondary winding enclosed.
  • the two windings are usually made of copper wire.
  • the high voltage generated in it is insulated from other electrically conductive parts.
  • the electrical insulation of the secondary or high-voltage winding is usually carried out by means of electrically insulating materials and / or by air gaps to other electrically conductive parts. If such insulation is inadequate, a so-called electrical shunt or electrical breakdown from the high-voltage winding to another electrically conductive component of the ignition coil can occur. The consequence of this is that only a reduced high voltage at the high-voltage connection of the ignition coil
  • critical components of the ignition coil can be the windings and in particular components of the magnetically active core.
  • the core is usually grounded, so that between the high voltage secondary winding and the magnetically active core there is a large electrical potential difference.
  • High-voltage winding and the respective electrically conductive component are strongly dependent on the existing geometric conditions.
  • angular or even pointed surface contours of the respective component lead to local field strength increases due to physics, which in turn promote electrical breakdown. Corners, tips or even edges on electrically conductive parts that are arranged in the area of influence of the high voltage represent a potential risk with regard to an electrical breakdown in an ignition coil.
  • the magnetically active core usually consists of punched individual sheets which are packaged to form a stack of a certain height.
  • the stack has numerous angular or pointed bumps, particularly on its flanks, which can lead to excessive field increases and thus to a breakdown during operation of the ignition coil.
  • electrical breakdowns correspondingly large insulation distances have been maintained or, if possible, correspondingly good insulation materials have been used.
  • the invention has for its object to provide an ignition coil of the type mentioned, in which there is a low risk of electrical breakdown despite the presence of a rough surface on an electrically conductive component 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 according to the preamble of patent claim 1, in which the ignition coil is provided at least in some areas with a means for electrically leveling its surface, has the advantage that unevenness promoting an electrical breakdown, such as corners, edges, ridges or the like, on the electrically conductive component is compensated and the risk of an electrical breakdown is minimized.
  • the distance can be reduced compared to the prior art with a constant potential difference between this component and a high-voltage component, which allows smaller sizes of the ignition coil.
  • a greater potential difference between a high-voltage component and the component provided with the means for electrically leveling its surface can also be achieved at the same distance, which in turn leads to an improvement in the performance of the ignition coil.
  • the means for electrically leveling the surface of the electrically conductive component is formed from an electrically conductive sheath which has a smooth surface.
  • This covering is an easy-to-apply means to remove a rough surface of the electrically conductive component, i. H. its bumps to cover or shield in an electrically effective manner.
  • the cladding thus significantly reduces field strength increases caused by unevenness in the electrically conductive component. This also reduces the risk of electrical breakdown between a high-voltage component and the component provided with the sheath.
  • the electrically conductive sheathing is possibly formed only in those areas of the electrically conductive component which have unevenness and thus harbor the risk of breakdowns.
  • the covering consists, for example, of an electrically conductive plastic which is sprayed onto the relevant electrically conductive component or is placed as a separate part on the electrically conductive component. It must always be ensured that the casing and the electrically conductive component are in contact with one another.
  • the covering made of the electrically conductive plastic has, for example, a thickness between 0.1 mm and 1 mm and preferably of 0.5 mm.
  • the electrically conductive component is the magnetically active core of the ignition coil, which is generally formed from a laminated core which is constructed from punched individual sheets and can therefore have corners, edges, burrs or the like on its flanks.
  • the ignition coil according to the invention is designed, for example, as a compact ignition coil which has 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 can be the I-core and / or the peripheral core.
  • FIG. 1 shows a plan view of an ignition coil according to the invention
  • FIG. 2 shows a section through the ignition coil according to FIG. 1 along the line II-II in FIG. 1
  • FIG. 3 shows a partial, general sectional view through an ignition coil.
  • FIG. 1 and 2 show an ignition coil 10 of an ignition system of an internal combustion engine of a motor vehicle, which is otherwise not shown in detail.
  • the ignition coil 10 serves to supply a spark plug, also not shown here, with high-voltage pulses, so that a spark plug in the combustion chamber
  • the ignition coil 10 is a compact ignition coil and comprises a housing 12 made of an electrically insulating plastic, in which a soft-magnetic, cuboid-shaped I-core 14 is arranged in a central position.
  • the magnetically active I-core 14 is surrounded by an insulator 16 made of casting resin, which serves as a coil former for a so-called primary winding 18 made of copper wire, which is connected via a low-voltage connection 20 to a DC voltage network of the motor vehicle and thus with a DC voltage of for example 12 V can be supplied.
  • the primary winding 18 is in turn surrounded by a Spulenkö ⁇ er 22, which serves as a carrier for a so-called secondary winding 24, which is in operation at high voltage and is connected to a high voltage connection 26, which is used for connection to a spark plug.
  • the I-core 14, the bobbin 16, the primary winding 18, the Spulenkö ⁇ er 22 and the secondary winding 24 form a structural unit which is cast in resin for fixing in the housing 12 in a manner not shown here.
  • the housing 12 is made of a so-called O-core or
  • the O-core On its side facing away from the low-voltage connection 20, the O-core has a so-called screw-on eye 30, which is used for ground contact.
  • FIG. 3 shows a schematic, general illustration of the conditions in the case of an ignition coil 32 according to the invention and illustrates the “electrical leveling” caused by a plastic sheath of the field peaks which otherwise occur due to the edges of the iron core, as a result of which the risk of electrical breakdown would be much higher.
  • a plastic sheath can be used in compact ignition coils, 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 a flank 33 with edges and is enclosed by a sheath 34 made of electrically conductive plastic, which has a smooth surface and is a means for electrically flattening the flank 33.
  • the casing 34 is provided with radii.
  • the iron core 37 and the casing 34 are in turn embedded in an insulating material 35, which consists for example of cast resin
  • the iron core 37 interacts with a secondary or high-voltage winding 36, of which the outer winding layer is shown in FIG. 3 and which is connected to a high-voltage connection, and a low-voltage or primary winding, which is not shown in more detail in FIG. 3 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.
EP04798138A 2003-12-09 2004-11-02 Bobine d'allumage Expired - Lifetime 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 true EP1694960A1 (fr) 2006-08-30
EP1694960B1 EP1694960B1 (fr) 2011-01-26

Family

ID=34638501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04798138A Expired - Lifetime 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
EP1220244A3 (fr) 1997-05-23 2002-08-28 Hitachi, Ltd. Bobine d'allumage pour moteur et moteur pourvu d'un capot en plastique
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
See references of WO2005059355A1 *

Also Published As

Publication number Publication date
DE502004012154D1 (de) 2011-03-10
US20070256655A1 (en) 2007-11-08
US7911305B2 (en) 2011-03-22
DE10357349A1 (de) 2005-07-07
WO2005059355A1 (fr) 2005-06-30
JP2006514219A (ja) 2006-04-27
EP1694960B1 (fr) 2011-01-26

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