EP0418137B1 - Zündspule, besonders für Brennkraftmaschinen von Kraftfahrzeugen - Google Patents

Zündspule, besonders für Brennkraftmaschinen von Kraftfahrzeugen Download PDF

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Publication number
EP0418137B1
EP0418137B1 EP19900402486 EP90402486A EP0418137B1 EP 0418137 B1 EP0418137 B1 EP 0418137B1 EP 19900402486 EP19900402486 EP 19900402486 EP 90402486 A EP90402486 A EP 90402486A EP 0418137 B1 EP0418137 B1 EP 0418137B1
Authority
EP
European Patent Office
Prior art keywords
high tension
ignition coil
magnetic flux
housing
return circuit
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
EP19900402486
Other languages
English (en)
French (fr)
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EP0418137A1 (de
Inventor
Eric Badaud
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
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 Sagem Allumage SA filed Critical Sagem Allumage SA
Publication of EP0418137A1 publication Critical patent/EP0418137A1/de
Application granted granted Critical
Publication of EP0418137B1 publication Critical patent/EP0418137B1/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
    • 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 ignition coil, in particular for an internal combustion engine of a motor vehicle, of the type described in document GB-A-2 173 047 and defined in the preamble of claim 1.
  • the secondary of such a coil produces a very high voltage making it possible to generate an electric arc at the electrodes of the spark plugs, thereby igniting the fuel mixture contained in the cylinders of the engine.
  • a single coil controls all of the spark plugs via, for example, a mechanical distributor, generally of the rotating finger type.
  • the present invention relates more particularly to such a coil, known as a single-cylinder which comprises in a manner known per se, a closed circuit magnetic assembly comprising a central magnetic core around which two coils of plastic material carrying the primary and secondary windings are arranged coaxially, this assembly being integrated in a molded plastic housing. Synthetic resin, poured inside the case and electrically insulates the various elements of the ignition coil from each other in a manner known per se.
  • the present invention provides an ignition coil, in particular for an internal combustion engine of a motor vehicle, according to claim 1.
  • said rectangle is formed by the housing and the magnetic flux return circuit which is U-shaped, the branches of which extend beyond one of the faces of the central core.
  • the high-voltage output member is centered relative to the fixing points of the coil which are located at the four corners of said rectangle.
  • a single-cylinder ignition coil according to the invention comprises a closed magnetic circuit comprising a primary winding 1 wound around a primary coil 2.
  • the secondary assembly S is held in lift on and around the primary assembly P.
  • the primary P and secondary S assemblies being assembled one inside the other, the magnetic circuit thus formed is introduced into the housing 6 of a housing 7 made of insulating material.
  • a magnetic flux return circuit 8 made up of cut and laminated magnetic sheets is incorporated by molding in the housing 7.
  • Said magnetic flux return circuit comprises three parts 8 a , 8 b , 8 c forming in section a U constituting the three sides of a rectangle.
  • These surfaces 9 a , 9 b of generally rectangular shape, are opposite the ends of the central magnetic core 3.
  • the branches 8 a , 8 b are extended by a length 1 beyond the line XX 'corresponding to one of the faces of the central magnetic core 3.
  • magnetic flux return circuit 8 and therefore the housing 7 in which it is molded completely encompass the secondary coil 5 and therefore the primary P and secondary S magnetic assemblies.
  • this extension of the branches 8 a , 8 b has an additional heat exchange surface and therefore allows better cooling of the entire ignition coil.
  • This particular arrangement also allows the magnetic flux return circuit 8 to have a general rectangular outline in combination with the housing 7 facilitating the fixing of the entire ignition coil to the engine block.
  • said magnetic flux return circuit 8 comprises the means for fixing the ignition coil and constitutes the metal frame of the housing 7.
  • a connector 11, made integral with the housing 7 by overmolding allows the low voltage supply of the coil.
  • the high-voltage output assembly of the ignition coil comprises a high-voltage bracket 12 consisting of a barrel 13 of generally cylindrical shape connecting to a strip 14 by means of two sails 15, 16, said strip 14 comprising two pawns 17,18.
  • the high-voltage output assembly also includes a high-voltage guide 19 which is in the general form of a tube, one of its ends of which is extended by a horizontal tongue 20 made from material, this tongue having a vertical tab. 21.
  • a spring 22 constituting the high-voltage output member is introduced into the high-voltage guide 19 until it comes into abutment against the tongue 20.
  • the high-voltage guide 19 fitted with the spring 22 is introduced inside the barrel 13 of the high-voltage bracket 12 and is fixed therein by a latching system which, not forming part of the present invention, was not represented.
  • This high-voltage connection assembly thus produced is positioned in the housing 7 on the secondary coil 4 already installed.
  • Resin is then poured into the housing 6 of the housing 7 and the hardening of the resin immobilizes all the constituents by isolating them from each other.
  • the general design of the ignition coil is such that, according to the invention, the axis YY 'of the high-voltage output member, constituted here by the spring 19 , is centered with respect to the rectangle constituted by the magnetic flux return circuit 8, the axis YY ′ being located at a point corresponding to the crossing of the diagonals of said rectangle, diagonals on which there are the fixing holes 10 a , 10 b , 10 c , 10 d .

Landscapes

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

Claims (2)

  1. Zündspule, insbesondere für Brennkraftmaschinen von Kraftfahrzeugen, umfassend ein in ein Gehäuse (7) integriertes Magnetsystem, welches insbesondere aus einem in einer Primärspule (2) gelagerten Magnetkern (3) besteht, eine zur Primärspule (2) koaxial angeordnete Sekundärspule (4), Primärwicklungen (1) und Sekundär- wicklungen (5), ein Hochspannungs-Verbindungssystem und einen Magnetkreis (8), bestehend aus mindestens 3 Teilen (8a, 8b, 8c), die im Querschnitt ein U bilden und drei Seiten eines Rechtecks bilden, in welches der besagte Magnetkreis (8) eingeschrieben ist, dadurch gekennzeichnet, daß das Hochspannungs-Verbindungssystem einen zylindrischen Hochspannungsträger (12) umfaßt, welcher eine röhrenförmige Hochspannungsführung (19) aufnimmt, in welcher ein Hochspannungs-Ausgangsorgan (22) angeordnet ist, daß das besagte Hochspannungs-Ausgangsorgan (19) so angeordnet ist, daß es in einer Richtung durch den Mittelpunkt (Y - Y') des besagten Rechtecks geht und daß das Hochspannungs-Ausgangsorgan (22) in der Hochspannungsführung (19) befestigt ist und die Hochspannungsführung (19) im Hochspannungsträger (12) mittels in das Gehäuse (7) eingegossenen Harzes.
  2. Zündspule gemäß Anspruch 1, dadurch gekennzeichnet, daß die Teile (8a, 8b) des Magnetkreises (8), welche die beiden Schenkel des U bilden, um eine Länge (1) in Bezug auf die Seite (X, X') des Zentralkerns (3) verlängert sind.
EP19900402486 1989-09-15 1990-09-11 Zündspule, besonders für Brennkraftmaschinen von Kraftfahrzeugen Expired - Lifetime EP0418137B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912088 1989-09-15
FR8912088A FR2652195B1 (fr) 1989-09-15 1989-09-15 Bobine d'allumage, en particulier pour moteur a combustion interne de vehicule automobile.

Publications (2)

Publication Number Publication Date
EP0418137A1 EP0418137A1 (de) 1991-03-20
EP0418137B1 true EP0418137B1 (de) 1994-01-12

Family

ID=9385503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900402486 Expired - Lifetime EP0418137B1 (de) 1989-09-15 1990-09-11 Zündspule, besonders für Brennkraftmaschinen von Kraftfahrzeugen

Country Status (5)

Country Link
EP (1) EP0418137B1 (de)
JP (1) JPH03108305A (de)
DE (1) DE69005955T2 (de)
ES (1) ES2048464T3 (de)
FR (1) FR2652195B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4119413C1 (de) * 1991-06-13 1992-09-17 Robert Bosch Gmbh, 7000 Stuttgart, De
DE4404957C2 (de) * 1994-02-17 2003-08-21 Bosch Gmbh Robert Zündspule für eine Brennkraftmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1608891A (en) * 1926-02-03 1926-11-30 North East Electric Co Ignition coil
US4382430A (en) * 1981-06-01 1983-05-10 Shinichiro Iwasaki Ignition system
JPH0793215B2 (ja) * 1985-03-25 1995-10-09 株式会社日立製作所 内燃機関の点火装置

Also Published As

Publication number Publication date
ES2048464T3 (es) 1994-03-16
FR2652195A1 (fr) 1991-03-22
DE69005955T2 (de) 1994-07-07
FR2652195B1 (fr) 1992-01-31
JPH03108305A (ja) 1991-05-08
DE69005955D1 (de) 1994-02-24
EP0418137A1 (de) 1991-03-20

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