EP1566819A2 - Bobine d'allumage tige - Google Patents

Bobine d'allumage tige Download PDF

Info

Publication number
EP1566819A2
EP1566819A2 EP04106487A EP04106487A EP1566819A2 EP 1566819 A2 EP1566819 A2 EP 1566819A2 EP 04106487 A EP04106487 A EP 04106487A EP 04106487 A EP04106487 A EP 04106487A EP 1566819 A2 EP1566819 A2 EP 1566819A2
Authority
EP
European Patent Office
Prior art keywords
ignition coil
buffer
core assembly
rod
core
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
EP04106487A
Other languages
German (de)
English (en)
Other versions
EP1566819B1 (fr
EP1566819A3 (fr
Inventor
Thomas Alber
Karl Bertele
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 EP1566819A2 publication Critical patent/EP1566819A2/fr
Publication of EP1566819A3 publication Critical patent/EP1566819A3/fr
Application granted granted Critical
Publication of EP1566819B1 publication Critical patent/EP1566819B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/005—Impregnating or encapsulating

Definitions

  • the invention is based on a pencil ignition coil of an ignition system of an internal combustion engine, in particular an internal combustion engine of a motor vehicle, according to the preamble of claim 1 more defined type.
  • Such a pencil ignition coil is known from practice and is used in particular for driving a spark plug of a working according to the Otto principle motor vehicle internal combustion engine.
  • the pencil ignition coil forms an energy storage and transformer, by means of which electrical energy of a comparatively low supply voltage, which is usually is provided by a DC electrical system of the relevant motor vehicle, is converted into magnetic energy, which at a desired time, to the an ignition pulse to the ignition of a fuel mixture in the combustion chamber of the internal combustion engine Serving spark plug is to be delivered in a high voltage pulse is implemented.
  • the known pencil ignition coil comprises a primary winding arranged on a primary coil body, which is connected to a low voltage connection, and a concentric arranged to the primary winding, wound on a secondary coil body secondary winding, which is connected to a high voltage terminal for connection to the Spark plug is used.
  • the bobbins enclose a core assembly of the pencil ignition coil, the a rod-shaped package of ferromagnetic sheets, one on one end face of the disk pack arranged cover, one arranged on the other end side of the disk pack Buffer and a sheath made of plastic.
  • the cover, the buffer and the Covering the core assembly serve to form a cured potting material containing cavities the pencil ignition coil fills with a potting material, in front of the sharp-edged sheets the lamella package and thus the risk of formation of cracks in the To reduce casting material.
  • the core assembly during a pre-assembly in a Housing of the ignition coil arranged. Subsequently, the preassembled ignition coil in a Potting chamber according to a so-called vacuum potting process with an epoxy resin cast resin formed. The casting is done in vacuum to all cavities to fill the ignition coil with the epoxy resin or casting resin and impregnate the windings to be able to. Since the laminated core of the core assembly of the plastic sheath, the Buffer and the cover is enclosed, arises during the evacuation of the casting chamber Pressure gradient between the interior of the core assembly and its surroundings.
  • the invention is based on the object, a pencil ignition coil of the aforementioned type to create, in which when casting with a casting resin in a vacuum no essential Forming pressure gradient between the interior of the core assembly and its surroundings can.
  • the inventive pencil ignition coil of an ignition system of an internal combustion engine, in particular an internal combustion engine of a motor vehicle, having the features of the preamble of claim 1 and at least one air passage, with which the buffer is formed is, has the advantage that when evacuating one for the production of a casting resin the rod ignition coil serving potting no pressure gradient between the interior the core assembly and its environment can build, as through the air passage fast pressure compensation is possible. Any existing in the core assembly air can therefore when evacuating the potting chamber via the air passage of an elastic Material formed buffer escape.
  • an inventively designed pencil ignition coil This ensures that the usually formed of epoxy resin potting material the ignition coil in the cured state has no bubbles through an air outlet resulting from the core assembly.
  • the pencil ignition coil according to the invention is the air passage formed from at least one slot. Over the slot can the core assembly be vented. However, no casting resin can penetrate into the core assembly via the slot, Since this usually has such a high viscosity that it is not by one of a Cut formed slot of an elastic material can occur. This is also excluded in that the function of the buffer, by means of the casting material formed from the casting resin, which compensates for a change in length of the laminated core in the event of a temperature change becomes.
  • At least two intersecting slots pass through the buffer.
  • the way through the slots formed tabs of the buffer then work in the manner of ventilation flaps.
  • FIG. 1 shows a core assembly according to the invention of a pencil ignition coil
  • Figure 2 is a plan view of a buffer of the core assembly shown in Fig. 1.
  • FIGS. 1 and 2 a core assembly 10 of a pencil ignition coil of an ignition system is shown shown as gasoline engine designed internal combustion engine of a motor vehicle.
  • the pencil ignition coil serves to supply a spark plug not shown here with high-voltage pulses, so that by means of the spark plug in a combustion chamber of the internal combustion engine contained air / fuel mixture can be ignited.
  • the pencil ignition coil comprises in the assembled state next to the core assembly 10 a the core assembly enclosing SekundärwickelSystem, on which a secondary winding is arranged, which is connected to a high voltage terminal, which leads to the spark plug leads.
  • the secondary winding is in turn surrounded by a primary bobbin, on which a primary winding sits, which has a low voltage connection with one DC electrical system of the motor vehicle is connected.
  • the core assembly 10 includes a core 12 formed from stamped iron sheets, which is rod-shaped and formed on a front side of one of a permanent magnet formed cover plate 14 and at its other end of a buffer of an elastic Material, for example of a foamed silicone material is limited. At its circumference is the core 12 of an envelope formed from a shrink tube 18, the front side on the one hand on the cover 14 and on the other hand on the buffer 16 rests. The formed from the sheath 18, the cover 14 and the buffer 16 Sheath of the core 12 can thus temperature-induced changes in length of the core 12th take up.
  • the buffer 16 has two intersecting slots 20 and 22, during the casting of the pencil ignition coil with an epoxy resin in a vacuum chamber during the evacuation of the vacuum chamber for venting the core assembly 10 are used and Thus, a rapid pressure equalization between the interior of the core assembly 10 and the Environment allow.
  • a core assembly of a pencil ignition coil may also be formed so that the Cover of a non-magnetic material, for example of a hard silicone material, is formed and a magnet between the buffer and the core is arranged. It is also conceivable to form the core assembly with two permanent magnets, of which one is formed by the cover and the other between the core and the Buffer is arranged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP20040106487 2004-02-23 2004-12-10 Bobine d'allumage tige Expired - Fee Related EP1566819B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004008986 2004-02-23
DE200410008986 DE102004008986A1 (de) 2004-02-23 2004-02-23 Stabzündspule

Publications (3)

Publication Number Publication Date
EP1566819A2 true EP1566819A2 (fr) 2005-08-24
EP1566819A3 EP1566819A3 (fr) 2007-10-03
EP1566819B1 EP1566819B1 (fr) 2011-05-18

Family

ID=34706905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040106487 Expired - Fee Related EP1566819B1 (fr) 2004-02-23 2004-12-10 Bobine d'allumage tige

Country Status (2)

Country Link
EP (1) EP1566819B1 (fr)
DE (1) DE102004008986A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2516442C2 (ru) * 2008-03-26 2014-05-20 Роберт Бош Гмбх Катушка зажигания

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005039761B4 (de) * 2005-08-23 2014-04-03 Robert Bosch Gmbh Kernbaugruppe, insbesondere für eine Zündspule einer Brennkraftmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19927820C1 (de) 1998-10-27 2000-07-06 Bremi Auto Elektrik Ernst Brem Stabzündspule

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3604917B2 (ja) * 1998-09-07 2004-12-22 株式会社日立製作所 内燃機関用点火コイル
JP4062951B2 (ja) * 2001-05-08 2008-03-19 株式会社デンソー 内燃機関用点火コイル

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19927820C1 (de) 1998-10-27 2000-07-06 Bremi Auto Elektrik Ernst Brem Stabzündspule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2516442C2 (ru) * 2008-03-26 2014-05-20 Роберт Бош Гмбх Катушка зажигания

Also Published As

Publication number Publication date
EP1566819B1 (fr) 2011-05-18
EP1566819A3 (fr) 2007-10-03
DE102004008986A1 (de) 2005-09-08

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