EP1780737A1 - Zündspule - Google Patents

Zündspule Download PDF

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Publication number
EP1780737A1
EP1780737A1 EP06270043A EP06270043A EP1780737A1 EP 1780737 A1 EP1780737 A1 EP 1780737A1 EP 06270043 A EP06270043 A EP 06270043A EP 06270043 A EP06270043 A EP 06270043A EP 1780737 A1 EP1780737 A1 EP 1780737A1
Authority
EP
European Patent Office
Prior art keywords
primary
ignition coil
support spool
coil
resilient
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
EP06270043A
Other languages
English (en)
French (fr)
Other versions
EP1780737B1 (de
Inventor
Corina Moga
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1780737A1 publication Critical patent/EP1780737A1/de
Application granted granted Critical
Publication of EP1780737B1 publication Critical patent/EP1780737B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/40—Sparking plugs structurally combined with other devices
    • H01T13/44—Sparking plugs structurally combined with other devices with transformers, e.g. for high-frequency ignition
    • 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
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers
    • 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 present invention relates to ignition coils, particularly, but not exclusively, ignition coils which are directly attached to the spark plugs of internal combustion engines.
  • Independent ignition coils are commonly mounted directly to the spark plugs of an internal combustion engine.
  • Such coils typically include co-axially arranged secondary and primary coils which are wound around respective support spools. Each coil is typically attached to the support spool by way of a resin which holds them in place during assembly and operation.
  • Pencil-type coils are normally mounted very close to the engine combustion chambers and are therefore subjected to a continual heating/cooling cycle throughout their operational lifetime.
  • the variation in the thermal expansion properties of the co-axially arranged materials in the ignition coil can cause stresses and strains within the coil which result in components breaking over time. This produces reliability problems.
  • an ignition coil comprising:
  • the resilient thermal expansion de-coupling means is provided between the first coil and first support spool.
  • the resilient thermal expansion de-coupling means is provided between the second coil and second support spool.
  • the resilient thermal expansion de-coupling means comprises a resilient sheath buffer capable of expanding and contracting in a radial direction i.e. normal to the co-axis. More preferably, the resilient sheath buffer is also capable of movement in an axial direction. Preferably, said movement in the axial direction is a result of relative axial movement between the primary coil and primary support spool.
  • the material comprising the resilient thermal expansion de-coupling means comprises a material having a Young's Modulus in the region of 10 to 100Mpa at approximately 170°C and typically has a wall thickness in the region of 0.1 to 0.5 mm.
  • the resilient sheath buffer is provided with a radial protrusion adjacent at least one end of the resilient sheath buffer such that resilient axial movement of the primary coil relative to the primary support spool is possible.
  • the primary support spool comprises a tubular synthetic member around which the resilient thermal expansion de-coupling means and primary coil may be arranged.
  • the secondary support spool comprises a tubular synthetic member around which the secondary coil may be wound.
  • a shrink tube is provided around the core member.
  • An ignition coil unit 10 comprises an ignition circuit case 12 which houses the coil circuitry (not shown), a core housing 14 and a boot 16 which allows connection to a spark plug (not shown).
  • co-axial layers within the core housing 14 comprise a core member 18, shrink tube 37, epoxy resin layer 20, secondary support spool 22, secondary coil 24, epoxy insulation layer 26, primary support spool 28, resilient thermal expansion de-coupling buffer 30, primary coil 32 and casing 34.
  • An outer protective sheath 36 (Fig. 3) is also provided around the mid-section of ignition coil 10.
  • the core member 18 is typically formed from an elongate silicon steel member.
  • the secondary support spool 22 is typically a tube formed from a synthetic resin and houses the core member 18 therein via a shrink tube 37 and a layer of epoxy resin 20. In addition to its securing properties, the layer of resin 20 also provides electrical insulation between the core member 18 and the outer coils 24, 32.
  • Secondary coil 24 is formed from a wire wound around the secondary support spool 22 thousands of times. In the present embodiment the wire has approximately 1500 turns.
  • the epoxy insulation layer 26 and shrink tube 37 act as electrical insulators between the primary and secondary coils.
  • Primary support spool 28 is positioned around the epoxy insulation layer 26 and may be held to some extent thereby.
  • the primary support spool 28 is similar in construction to the secondary support spool 22 with appropriate dimensional modifications; however, a lip L also projects radially outward from the outer circumference of the primary support 28. This lip L allows secure abutment against a shoulder 35 of the casing 34 and provides a gap A between the shoulder 35 and the coil 32 / buffer 30 as discussed subsequently.
  • the resilient thermal expansion de-coupling buffer 30 comprises any material (such as silicon rubber) which is capable of withstanding the heating conditions of the surrounding environment and which is capable of expanding and contracting to accommodate the differential expansion and contraction of the components surrounding it.
  • the buffer may typically comprise a sleeve having a wall thickness of between 0.1mm and 0.5mm and a Young's Modulus of 10 to 100 MPa at 170°C.
  • a radially extending protrusion P is provided around the lower circumference of the buffer 30 as shown in Fig. 3. This sits against the upper surface of lip L and resiliently supports coil 32 as discussed subsequently.
  • Primary coil 32 is formed by a wire wound around the buffer 30 and primary support spool 28 many hundreds of times. In the present embodiment, the wire is provided with approximately 200 turns. Primary coil 32 typically has a lower co-efficient of thermal expansion than the rest of the components in the ignition coil 10 and the effects of this will be discussed subsequently.
  • each of the co-axial layers described will expand in the axial direction (Ax in Fig. 3) and radial direction (Ra in Fig. 3) according to their respective co-efficient of thermal expansion.
  • the primary wire may be regarded as a composite material since it comprises copper wire combined with an epoxy. This results in a composite material which has a co-efficient of thermal expansion that is significantly less than that of the other layers.
  • the buffer 32 is able to accommodate these differences in expansion of the layers by radially expanding or contracting as required.
  • the protrusion P of the buffer in conjunction with the support provided by lip L allows resilient relative axial movement between the primary coil 32 and primary spool 28 to occur.
  • Such a protrusion P may be provided at either or both of the high voltage and low voltage ends of the ignition coil 10.
  • the expansion and compression of the buffer 30 therefore allows stresses between the primary coil 32 and primary support 28 (which would otherwise occur during heating and cooling of the ignition coil 10) to be alleviated. This de-coupling of stresses increases the longevity and reliability of the ignition coil 10.
  • the embodiment described only has a buffer 30 between the primary coil 32 and the primary support spool 28 it would be possible to have a buffer between the secondary coil and the secondary support if desired. In addition, it would be possible to arrange the primary coil inside of the secondary coil.

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)
EP06270043A 2005-10-28 2006-05-04 Zündspule Active EP1780737B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0522000.9A GB0522000D0 (en) 2005-10-28 2005-10-28 Ignition coil

Publications (2)

Publication Number Publication Date
EP1780737A1 true EP1780737A1 (de) 2007-05-02
EP1780737B1 EP1780737B1 (de) 2009-01-07

Family

ID=35515900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06270043A Active EP1780737B1 (de) 2005-10-28 2006-05-04 Zündspule

Country Status (4)

Country Link
EP (1) EP1780737B1 (de)
AT (1) ATE420447T1 (de)
DE (1) DE602006004675D1 (de)
GB (1) GB0522000D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2423927A3 (de) * 2010-08-24 2013-04-03 Rolls-Royce plc Elektromagnetische Vorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09289122A (ja) * 1996-04-19 1997-11-04 Matsushita Electric Ind Co Ltd 内燃機関の点火コイル装置
US20020057179A1 (en) * 1997-09-30 2002-05-16 Hitachi, Ltd. Ignition coil for use in internal combustion engine
EP1209705A1 (de) * 1999-06-09 2002-05-29 Hitachi, Ltd. Zündspule für brennkraftmaschine
US20030080843A1 (en) * 2001-10-30 2003-05-01 Jyunichi Wada Ignition coil having air layers as insulators and manufacturing method therefor
US20030122645A1 (en) * 1997-02-14 2003-07-03 Denso Corporation Stick-type ignition coil having improved structure against crack or dielectric discharge
EP1589546A1 (de) * 2004-04-22 2005-10-26 Federal-Mogul Ignition Srl Zündspule mit verbessertem Widerstand gegen thermische Spannungen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09289122A (ja) * 1996-04-19 1997-11-04 Matsushita Electric Ind Co Ltd 内燃機関の点火コイル装置
US20030122645A1 (en) * 1997-02-14 2003-07-03 Denso Corporation Stick-type ignition coil having improved structure against crack or dielectric discharge
US20020057179A1 (en) * 1997-09-30 2002-05-16 Hitachi, Ltd. Ignition coil for use in internal combustion engine
EP1209705A1 (de) * 1999-06-09 2002-05-29 Hitachi, Ltd. Zündspule für brennkraftmaschine
US20030080843A1 (en) * 2001-10-30 2003-05-01 Jyunichi Wada Ignition coil having air layers as insulators and manufacturing method therefor
EP1589546A1 (de) * 2004-04-22 2005-10-26 Federal-Mogul Ignition Srl Zündspule mit verbessertem Widerstand gegen thermische Spannungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2423927A3 (de) * 2010-08-24 2013-04-03 Rolls-Royce plc Elektromagnetische Vorrichtung

Also Published As

Publication number Publication date
GB0522000D0 (en) 2005-12-07
ATE420447T1 (de) 2009-01-15
DE602006004675D1 (de) 2009-02-26
EP1780737B1 (de) 2009-01-07

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