EP0283354B1 - Elektrischer Transformator, insbesondere für eine Zündspule eines Verbrennungsmotors - Google Patents

Elektrischer Transformator, insbesondere für eine Zündspule eines Verbrennungsmotors Download PDF

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Publication number
EP0283354B1
EP0283354B1 EP88400411A EP88400411A EP0283354B1 EP 0283354 B1 EP0283354 B1 EP 0283354B1 EP 88400411 A EP88400411 A EP 88400411A EP 88400411 A EP88400411 A EP 88400411A EP 0283354 B1 EP0283354 B1 EP 0283354B1
Authority
EP
European Patent Office
Prior art keywords
casing
ignition coil
return circuit
current return
synthetic resin
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
EP88400411A
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English (en)
French (fr)
Other versions
EP0283354A1 (de
Inventor
Pierre Heritier-Best
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.)
Sagem SA
Original Assignee
Sagem Allumage SA
Valeo Electronique SA
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 FR8702910A external-priority patent/FR2611976B1/fr
Application filed by Sagem Allumage SA, Valeo Electronique SA filed Critical Sagem Allumage SA
Publication of EP0283354A1 publication Critical patent/EP0283354A1/de
Application granted granted Critical
Publication of EP0283354B1 publication Critical patent/EP0283354B1/de
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
    • 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
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines

Definitions

  • the present invention relates to an electrical transformer, and more particularly to an ignition coil, in particular for an internal combustion engine of a motor vehicle generally consisting of a magnetic circuit and two windings, one primary and the other secondary.
  • the magnetic circuit is, in certain types of coils, consisting of a central magnetic core around which are coaxially arranged two coils of plastic material, one carrying a primary winding and the other carrying a secondary winding, and at least a magnetic flux return circuit arranged facing the central magnetic core.
  • a central magnetic core around which are coaxially arranged two coils of plastic material, one carrying a primary winding and the other carrying a secondary winding, and at least a magnetic flux return circuit arranged facing the central magnetic core.
  • French patent application 85-11458 filed in the name of the applicant concerns an ignition coil of the type previously described in which the magnetic circuit and the primary and secondary coils are inserted in a plastic casing before pouring a resin therein. synthetic which will join and electrically isolate between them the different elements contained in said housing.
  • the housing is produced by overmolding a part of the magnetic return circuit.
  • An ignition coil of this type does not always meet the technical requirements which are required of it.
  • the magnetic circuit tends to deform and expand under the effect of its heating, which can cause the synthetic resin which traps it to crack, causing, in some places, a rupture of the electrical insulator formed by said synthetic resin, which promotes the formation of traveling currents from the high voltage secondary winding to the low voltage primary winding or to the various metallic masses of the ignition coil such as for example the magnetic circuit.
  • Patent application 86-10664 proposes to remedy this drawback by interposing a compressible sheath-shaped element between the synthetic resin and all or part of the magnetic circuit of the ignition coil.
  • this device sometimes proves to be insufficient when the magnetic circuit shows very large deformations and expansions.
  • the present invention overcomes these drawbacks and for this purpose relates to an ignition coil, in particular for the ignition of internal combustion engines of motor vehicles, of the type consisting of a central magnetic core on either side of which is arranged at least one magnetic flux return circuit, and two windings, one primary and the other secondary, arranged coaxially around the central magnetic core, characterized in that the primary and secondary windings, as well as the magnetic core central are arranged in a first housing, and embedded in a first synthetic resin having good dielectric characteristics, and that said first housing and at least part of the magnetic flux return circuit disposed around said first housing are disposed in a second housing formed with a second resin whose coefficient of expansion is compatible with that of the magnetic return circuit flow.
  • the first housing and the magnetic flux return circuit disposed around said first housing are arranged in a second housing filled with a second synthetic resin with high thermal conditions and having a coefficient of expansion compatible with that of the magnetic circuit of flow return.
  • the ignition coil 1 shown in Figures 1 to 3 consists of a magnetic circuit, made by a stack of cut sheets and held together, said magnetic circuit consisting of a central magnetic core 2, and two magnetic circuits flow return 3 and 4 in the form of "C" and arranged on either side of the central magnetic core 2 with an air gap 5 located between one end of the central magnetic core 2 and said magnetic return circuits of flux 3 and 4.
  • the two magnetic flux return circuits 3 and 4 are arranged on either side of the central magnetic core 2 so that the seals 6 formed by the assembly of the two magnetic flux return circuits 3 and 4 are located on the axis of symmetry of the magnetic circuit, materialized by the axis 7, so that the mean line of the magnetic flux does not cross the seals 6, which, if not, would form two additional air gaps areas harmful to the proper functioning of the ignition coil.
  • the central magnetic core 2 is housed in the hub of a plastic reel 10, on which is wound a primary winding 11.
  • a plastic coil 20 of circular section carrying a secondary winding 21, is arranged around the primary coil 10 and is held there by wedging on rounded sectors 34 of the support 30, and provided for this purpose.
  • the assembly thus formed is housed in a first housing 40, produced by molding of plastic material, comprising on the external face of its bottom, two guide rails 41.
  • a first synthetic resin 42 having good dielectric powers, is poured into the first housing 40, in order to connect and electrically isolate between them the various elements contained in said first housing 40, after having positioned the magnetic core-windings-support assembly so that the lower end of the central magnetic core 2 is in good contact with the bottom of the first housing 40 and so that said central magnetic core 2 is positioned facing the part of the bottom of said first housing 40 lying between the two rails 41, as shown more precisely in Figure 2.
  • the Applicant has provided positioning means (not shown) of the core-windings-support assembly relative to, and in the first housing 40.
  • the two magnetic flux return circuits 3 and 4 are then arranged around the first housing 40 by sliding them between the rails 41 of said first housing 40 so that these are located opposite the ends of the central magnetic core 2 ; in direct contact at its upper end, and through the bottom wall of the first housing 40 at its end lower, the thickness of the bottom of said first housing 40 being advantageously calibrated so as to serve as a shim defining exactly the value of the desired air gap 5.
  • the first housing 40 framed by the two magnetic flux return circuits 3 and 4 is then inserted into a second housing 50 in order to pour therein a second synthetic resin 51 of a different nature from the first synthetic resin 42, the second synthetic resin 51 having a coefficient of expansion compatible with the expansion and deformations of the double magnetic flux return circuit and having good thermal conduction qualities in order to promote the evacuation of the calories generated by the magnetic circuit, during the operation of the ignition coil 1.
  • Synthetic resins of this type are currently on the market.
  • the second synthetic resin 51 will accept the deformations of the magnetic circuit due to its heating, without risking breaking the insulator of the secondary winding 21 constituted by the first synthetic resin 42.
  • the embodiment shown 4 to 11 differs essentially from the previous one in that the second housing 13 is advantageously obtained by molding directly on the first housing 40 and the two magnetic flux return circuits 3 and 4.
  • the synthetic resin forming the second housing 13 advantageously has good qualities of thermal conduction favoring the evacuation of the calories generated by the magnetic circuit and whose coefficient of expansion accepts the deformations of said magnetic circuit during its heating.
  • the ignition coil 1 thus obtained has the advantage of eliminating the operation of filling the second housing with a synthetic material as previously, the dielectric characteristic of the filling is obtained directly by the properties of the material itself. for coating the second housing.
  • the high-voltage outlet chimney (or chimneys 14) 32 is obtained integrally with said housing, the high-voltage output plug 32 being positioned beforehand during the molding of the first housing. 40.
  • an opening is left on all or part of the lower branches 3 a , 4 has a magnetic flux return circuit 3 and 4 during the molding of the second housing 13.
  • a metal base 15 is inserted in the open part of the coating of the second housing 13 during the molding operation.
  • the metal base 15 consists of a bowl 17 having the external dimensions of the magnetic flux return circuit 3 and 4 so that said magnetic flux return circuit 3 and 4 housed partly in said bowl is intimately linked with the latter to allow a good dissipation of calories.
  • One of the lateral edges of the cover 17 is extended to constitute a support 25 for cooling fins 16.
  • the metal base 15 thus plays the role of a radiator.
  • the first housing 40 framed by the two magnetic flux return circuits 3 and 4 is inserted in the metal base 15, the bottom of the magnetic flux return circuit 3 and 4 in the bowl 17 and the bottom of the first housing 40 in thermal contact on the support 26.
  • Said assembly thus formed is housed in a mold into which the resin is poured to form the second housing 13.
  • the remaining visible metal base is anchored in the molding by its lateral edges 18 and 19.
  • the lateral edges 18 and 19 have a shape such that, during the molding of the second housing, the synthetic resin fits into the shoulder of said ends provided for this purpose (FIG. 6).
  • the variant shown in Figures 10 and 11 is distinguished in that the invention is applied to a double ignition coil.
  • the metal base 26 has for this purpose two cuvettes 27 and 28 which respectively receive a magnetic circuit as shown in the previous embodiment.

Landscapes

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

Claims (7)

  1. Zündspule (1), insbesondere zur Zündung von Kraftfahrzeug-Verbrennungsmotoren, in der Bauart bestehend aus einem zentralen Magnetkern (2), auf dessen beiden Seiten mindestens eine Magnetflußrückleitung (3, 4) angeordnet ist, und aus zwei Wicklungen, die eine primär (11) und die andere sekundär (21), welche koaxial um den zentralen Magnetkern (2) angeordnet sind, dadurch gekennzeichnet, daß die primäre Wicklung (11) und die sekundäre Wicklung (21) sowie der zentrale Magnetkern (2) in einem ersten Gehäuse (40) angeordnet und in ein erstes Kunstharz eingebettet sind, das gute dielektrische Eigenschaften besitzt, und daß das erste Gehäuse und mindestens ein Teil der Magnetflußrückleitung, die um dieses erste Gehäuse vorgesehen ist, in einem zweiten Gehäuse angeordnet sind, das mit einem zweiten Kunstharz gebildet ist, dessen Ausdehnungskoeffizient mit dem der Magnetflußrückleitung kompatibel ist.
  2. Zündspule (1) nach Anspruch 1, dadurch gekennzeichnet, daß das erste Gehäuse (40) Mittel zur Führung und Positionierung (41) der Magnetflußrückleitung (3) umfaßt.
  3. Zündspule (1) nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Wanddicke des Bodens des ersten Gehäuses (40) den Wert des zwischen dem einen Ende des zentralen Magnetkerns (2) und der Magnetflußrückleitung (3, 4) gelegenen Eisenspalts (5) bestimmt.
  4. Zündspule (1) nach Anspruch 1, dadurch gekennzeichnet, daß das zweite Gehäuse (13) durch Formen des zweiten Kunstharzes, welches das erste Gehäuse (40) und gänzlich oder zum Teil die Magnetflußrückleitung (3, 4) umhüllt, hergestellt wird.
  5. Zündspule (1), insbesondere zur Zündung von Kraftfahrzeug-Verbrennungsmotoren, bestehend aus einem zentralen Magnetkern (2), auf dessen beiden Seiten mindestens eine Magnetflußrückleitung (3, 4) angeordnet ist, und aus zwei Wicklungen, die eine primär (11) und die andere sekundär (21), welche koaxial um den zentralen Magnetkern (2) angeordnet sind, dadurch gekennzeichnet, daß die primäre Wicklung (11) und die sekundäre Wicklung (21) sowie der zentrale Magnetkern (2) in einem ersten Gehäuse (40) angeordnet und in ein erstes Kunstharz eingebettet sind, das gute dielektrische Eigenschaften besitzt, und daß das erste Gehäuse (40) und die Magnetflußrückleitung (3, 4), die um dieses erste Gehäuse vorgesehen ist, in einem zweiten Gehäuse angeordnet sind, das mit einem zweiten Kunstharz (51) gefüllt ist, das ein hohes Wärmeleitungsvermögen aufweist und einen Ausdehnungskoeffizienten besitzt, der mit dem der Magnetflußrückleitung (3, 4) kompatibel ist.
  6. Zündspule (1) nach Anspruch 4, dadurch gekennzeichnet, daß beim Formen des Kunstharzes aus dem Material mindestens eine Hochspannungsausgangsbuchse (14) hergestellt wird.
  7. Zündspule (1) nach Anspruch 4, dadurch gekennzeichnet, daß in den offenen Teil der das zweite Gehäuse (13) bildenden Kunstharzummantelung während des Formvorgangs eine metallische Grundplatte (26) eingefügt wird, die den unteren Teil der Magnetflußrückleitung (3, 4) aufnimmt.
EP88400411A 1987-03-04 1988-02-23 Elektrischer Transformator, insbesondere für eine Zündspule eines Verbrennungsmotors Expired - Lifetime EP0283354B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8702910A FR2611976B1 (fr) 1987-03-04 1987-03-04 Transformateur electrique, en particulier bobine d'allumage pour moteur a combustion interne
FR8702910 1987-03-04
FR8714514A FR2622344B2 (fr) 1987-03-04 1987-10-21 Transformateur electrique, en particulier bobine d'allumage pour moteur a combustion interne
FR8714514 1987-10-21

Publications (2)

Publication Number Publication Date
EP0283354A1 EP0283354A1 (de) 1988-09-21
EP0283354B1 true EP0283354B1 (de) 1993-05-05

Family

ID=26225822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400411A Expired - Lifetime EP0283354B1 (de) 1987-03-04 1988-02-23 Elektrischer Transformator, insbesondere für eine Zündspule eines Verbrennungsmotors

Country Status (5)

Country Link
US (1) US4843362A (de)
EP (1) EP0283354B1 (de)
JP (1) JP2625477B2 (de)
DE (1) DE3880718T2 (de)
FR (1) FR2622344B2 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5128646A (en) * 1989-10-20 1992-07-07 Aisan Kogyo Kabushiki Kaisha Ignition coil for an internal combustion engine
JPH04313205A (ja) * 1991-04-10 1992-11-05 Nippondenso Co Ltd 内燃機関用気筒別点火コイル
US5257611A (en) * 1991-12-23 1993-11-02 Ford Motor Company Ignition coil assembly and method of manufacture thereof
US5173076A (en) * 1992-01-22 1992-12-22 Hazenbroek Jacobus E Thigh deboner with tray conveyor
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
JP3453792B2 (ja) * 1993-07-09 2003-10-06 三菱電機株式会社 内燃機関用点火コイル
DE19720334C2 (de) * 1997-05-15 2000-04-06 Bosch Gmbh Robert Zündspule für Zündanlagen von Brennkraftmaschinen
EP1313111A1 (de) * 2001-11-19 2003-05-21 FRIWO Far East Limited Transformator
TW579052U (en) * 2002-08-14 2004-03-01 Delta Electronics Inc Transformer with thermal paste for heat conduction
US7209023B2 (en) * 2004-03-24 2007-04-24 Ford Motor Company Ignition coil with separating wall
DE102005048544A1 (de) * 2005-10-11 2007-04-12 Robert Bosch Gmbh Magnetkreis für Zündspule oder Trafos
TWI440054B (zh) * 2011-05-11 2014-06-01 Delta Electronics Inc 變壓器
JP2014096473A (ja) * 2012-11-09 2014-05-22 Diamond Electric Mfg Co Ltd 内燃機関用点火コイル
EP2811495B1 (de) * 2013-06-05 2017-01-11 Delphi Automotive Systems Luxembourg SA Wandler
JP6195229B2 (ja) * 2014-05-07 2017-09-13 株式会社オートネットワーク技術研究所 リアクトル

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1778253A (en) * 1927-08-04 1930-10-14 Koch & Sterzel Ag Current transformer
US3201728A (en) * 1962-08-23 1965-08-17 Westinghouse Electric Corp Evaporative cooled inductive apparatus having cast solid insulation with cooling ducts formed therein
US3668583A (en) * 1971-05-10 1972-06-06 Gen Electric Techniques for casting encapsulated coils
US3705372A (en) * 1971-12-07 1972-12-05 Westinghouse Electric Corp Cast-type winding structure for electrical inductive apparatus
DE2651218C3 (de) * 1976-11-10 1979-07-05 Robert Bosch Gmbh, 7000 Stuttgart Zündspule für Zündeinrichtungen von Brennkraftmaschinen
JPS5642316A (en) * 1979-09-14 1981-04-20 Hitachi Ltd Manufacture of molded ignition coil
DE3311775C1 (de) * 1983-03-31 1984-06-20 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Transformator fuer die Ablenkung von Elektronenstrahlen
JPS60192313A (ja) * 1984-03-14 1985-09-30 Nippon Denso Co Ltd コア一体モ−ルド型点火コイル
FR2585412B1 (fr) * 1985-07-26 1988-01-08 Ducellier & Cie Boitier de bobine d'allumage pour moteur a combustion interne
FR2595415A3 (fr) * 1986-03-06 1987-09-11 Ducellier & Cie Circuit magnetique loge dans un boitier de bobine d'allumage pour moteur a combustion interne

Also Published As

Publication number Publication date
JPS6477109A (en) 1989-03-23
FR2622344B2 (fr) 1995-05-19
DE3880718T2 (de) 1994-01-05
US4843362A (en) 1989-06-27
DE3880718D1 (de) 1993-06-09
EP0283354A1 (de) 1988-09-21
FR2622344A2 (fr) 1989-04-28
JP2625477B2 (ja) 1997-07-02

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