EP0118454B1 - Ignition coil for internal combustion engines - Google Patents

Ignition coil for internal combustion engines Download PDF

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Publication number
EP0118454B1
EP0118454B1 EP83901931A EP83901931A EP0118454B1 EP 0118454 B1 EP0118454 B1 EP 0118454B1 EP 83901931 A EP83901931 A EP 83901931A EP 83901931 A EP83901931 A EP 83901931A EP 0118454 B1 EP0118454 B1 EP 0118454B1
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EP
European Patent Office
Prior art keywords
branch
sheets
ignition coil
circuit
magnetic 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
Application number
EP83901931A
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German (de)
French (fr)
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EP0118454A1 (en
Inventor
Jean Marie Pierret
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Ducellier et Cie
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Ducellier et Cie
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Publication date
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Publication of EP0118454A1 publication Critical patent/EP0118454A1/en
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Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • 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
    • 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, for internal combustion engines, ignition coil comprising: a closed magnetic circuit consisting of sheets cut and stacked on each other; a permanent magnet disposed in a branch of thickness E of said circuit; the enroute - primary and secondary elements housed in an insulating housing surrounding a branch other thickness E '.
  • This ignition coil has a circuit for bypassing the magnetic flux, so that the flux reversal created in the branch, of thickness E ′, by the current flowing in the primary winding, does not demagnetize the permanent magnet .
  • This magnetic flux bypass circuit consists of two sheets of mild steel, which sheets have a tab provided with a hole, or an opening, receiving one of the fixing screws of the ignition coil on the motor vehicle.
  • Such known ignition coils in particular by French patent applications: FR-A-2476218 and 2486160, have the disadvantage that to secure, using rivets, the branches of thickness E and E ', it it is necessary to provide an overlap of the ends of the branch E ', which leads to providing a cutting tool for the sheets constituting the branch of thickness E' and three cutting tools for all the sheets constituting the branch E.
  • Another drawback is that the magnetic circuit can only be joined after having placed the insulating box, containing the primary and secondary windings, on the branch of thickness E 'and having subsequently stacked a number of sheets of the branch of thickness E, so as to constitute a packet of thickness corresponding to the thickness E '.
  • the circuit After which, in a third step, the circuit must be completed by the sheets of the branch of thickness E which ensure the covering of the ends of the branch of thickness E '.
  • an ignition coil for internal combustion engines comprising: a closed magnetic circuit (1) consisting of a plurality of sheets cut and stacked one on the other. the others so as to form a rectangular frame with branches of rectangular cross section; a permanent magnet (2) disposed between two half-branches (12b, 13b) defining a first branch (3) of the magnetic circuit; a primary winding (4) and a secondary winding (5) housed in an insulating housing (6) and surrounding a second branch (8) opposite to said first branch (3), coil characterized in that said closed magnetic circuit (1) comprises: a first part (12) U-shaped and having a first thickness (E '); a second L-shaped part (13) having a second thickness (E) greater than said thickness, a branch (12b) of said first part (12) and a branch (13b) of said second part (13) being cut out at a bevel and forming said two half-branches, a magnetic flux bypass circuit consisting of two sheets (9) of mild
  • a first advantage obtained by this invention is that the cutting of the sheets of the magnetic circuit requires only one tool per part, which reduces the expenses relating to the cutting tools.
  • a second advantage is the reduction in assembly time, due to the fact that the sheets which, in the prior art provided for the joining of the magnetic circuit, by covering the ends of the branch E ', are eliminated, the magnetic circuit being secured by an extension of the sheets constituting the magnetic flux bypass circuit.
  • the ignition coil according to the invention comprises a closed magnetic circuit 1 made up of cut sheets and stacked one on the other.
  • a permanent magnet 2 magnetized in the direction of its thickness is placed in a branch 3 of the closed magnetic circuit 1,
  • the magnetic flux bypass circuit consists of two sheets 9, made of mild steel, arranged, by means of insulating plates 10 and 11, on both sides and d other planes defining the thickness E of the branch 3.
  • the sheets 9, symmetrical cambered comprise a tab 9a, provided with a hole, or with an opening, not shown, so as to ensure the fixing of the ignition coil to the motor vehicle.
  • the closed miagnetic circuit 1 includes a first part 12, figures 1 and 4.
  • the first part 12 consists of sheets, cut into a U-shape, comprising a portion 12a cut in a bevel 12b. After stacking the sheets on top of each other, the portion 12a forms a half-branch of the branch 3, and a portion 12c forms the branch 8 of the closed magnetic circuit 1.
  • a second part 13, of the closed magnetic circuit 1, FIGS. 1 and 4 consists of sheets cut out in the shape of an L, which sheets include a portion 13a cut out in bevel 13b so as to form the other half-branch of branch 3 .
  • the first and second parts 12 and 13 are joined together, using known means, such as rivets 14, 1 and by extensions 9b of the sheets 9 constituting the circuit for deriving the magnetic flux.
  • the portion 13a of the second part 13 of the closed magnetic circuit 1 and the permanent magnet 2, FIG. 3 are in contact with the sheets 9 of the magnetic flux bypass circuit so that the air gap reluctance of said circuit is equivalent to the air gap reluctance of the circuit described in the French patent application FR-A-2486160. Consequently, the plates 10 and 11 of the present invention have a thickness equal to 2d relative to the thickness d of the insulating plates of the French patent application FR-A-2486 160.
  • the insulating plates 10 and 11 are molded with the insulating housing 6, and their internal faces 1 Oa and 11a constitute a housing for the portion 1 2a of the first part 12 of the closed magnetic circuit 1, FIG. 3.
  • the extension 9b of the sheets 9 has a bend 9c, FIG. 2.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

Coil comprising a closed magnetic circuit (1) consisting of cut out and piled metal sheets so as to form a first U-shaped part (12), of which one of the portions (12a) is cut to form a chamfer (12b), a second L-shaped part (13) comprising a portion (13a) cut to form a chamfer (13b) so that, after setting in place, on the branch (8), an insulating casing (6) containing primary (4) and secondary (5) windings and inserting a permanent magnetic (2) between the chamfers (12b and 13b), the first and second parts (12 and 13) are integral with each other, through rivets (14, 15) and prolongations (9b) of the metal sheets (9) forming a shunt circuit of the magnetic flux created by the primary winding (4).

Description

La présente invention concerne une bobine d'allumage, pour moteurs à combustion interne, bobine d'allumage comportant: un circuit magnétique fermé constitué de tôles découpées et empilées les unes sur les autres; un aimant permanent disposé dans une branche d'épaisseur E dudit circuit; des enroute- ments primaire et secondaire logés dans un boîtier isolant entourant une autre branche d'épaisseur E'.The present invention relates to an ignition coil, for internal combustion engines, ignition coil comprising: a closed magnetic circuit consisting of sheets cut and stacked on each other; a permanent magnet disposed in a branch of thickness E of said circuit; the enroute - primary and secondary elements housed in an insulating housing surrounding a branch other thickness E '.

Cette bobine d'allumage comporte un circuit de dérivation du flux magnétique, de manière que l'inversion de flux crée dans la branche, d'épaisseur E', par le courant circulant dans l'enroulement primaire, ne désaimante pas l'aimant permanent.This ignition coil has a circuit for bypassing the magnetic flux, so that the flux reversal created in the branch, of thickness E ′, by the current flowing in the primary winding, does not demagnetize the permanent magnet .

Ce circuit de dérivation du flux magnétique est constitué par deux tôles, en acier doux, lesquelles tôles comportent une patte munie d'un trou, ou d'une ouverture, recevant l'une des vis de fixation de la bobine d'allumage sur le véhicule automobile.This magnetic flux bypass circuit consists of two sheets of mild steel, which sheets have a tab provided with a hole, or an opening, receiving one of the fixing screws of the ignition coil on the motor vehicle.

De telles bobines d'allumage connues, notamment par les demandes françaises de brevets: FR-A-2476218 et 2486160, présentent l'inconvénient que pour solidariser, à l'aide de rivets, les branches d'épaisseur E et E', il est nécessaire de prévoir un recouvrement des extrémités de la branche E', ce qui conduit à prévoir un outil de découpe pour les tôles constituant la branche d'épaisseur E' et trois outils de découpe pour l'ensemble des tôles constituant la branche E.Such known ignition coils, in particular by French patent applications: FR-A-2476218 and 2486160, have the disadvantage that to secure, using rivets, the branches of thickness E and E ', it it is necessary to provide an overlap of the ends of the branch E ', which leads to providing a cutting tool for the sheets constituting the branch of thickness E' and three cutting tools for all the sheets constituting the branch E.

Un autre inconvénient est que le circuit magnétique ne peut être solidarisé qu'après avoir disposé le boîtier isolant, contenant les enroulements primaire et secondaire, sur la branche d'épaisseur E' et avoir dans un deuxième temps empilé un certain nombre de tôles de la branche d'épaisseur E, de manière à constituer un paquet d'épaisseur correspondante à l'épaisseur E'.Another drawback is that the magnetic circuit can only be joined after having placed the insulating box, containing the primary and secondary windings, on the branch of thickness E 'and having subsequently stacked a number of sheets of the branch of thickness E, so as to constitute a packet of thickness corresponding to the thickness E '.

Après quoi, dans un troisième temps, le circuit doit être complété par les tôles de la branche d'épaisseur E qui assurent le recouvrement des extrémités de la branche d'épaisseur E'.After which, in a third step, the circuit must be completed by the sheets of the branch of thickness E which ensure the covering of the ends of the branch of thickness E '.

Cette succession d'opérations représente une part non négligéable du prix de revient de ces bobines.This succession of operations represents a significant part of the cost price of these coils.

La présente invention a pour but de remédier à ces inconvénients et concerne à cet effet une bobine d'allumage pour moteurs à combustion interne, bobine comportant: un circuit magnétique fermé (1) constitué d'une pluralité de tôles découpées et empilées les unes sur les autres de façon à former un cadre rectangulaire à branches de section droite rectangulaire; un aimant permanent (2) disposé entre deux demi-branches (12b, 13b) définissant une première branche (3) du circuit magnétique; un enroulement primaire (4) et un enroulement secondaire (5) logés dans un boîtier isolant (6) et entourant une deuxième branche (8) opposée à ladite première branche (3), bobine caractérisée en ce que ledit circuit magnétique fermé (1) comporte: une première partie (12) en forme de U et ayant une première épaisseur (E'); une deuxième partie (13) en forme de L et ayant une deuxième épaisseur (E) supérieure à ladite épaisseur, une branche (12b) de ladite première partie (12) et une branche (13b) de ladite deuxième partie (13) étant découpées en biseau et formant lesdites deux demi-branches, un circuit de dérivation du flux magnétique constitué de deux tôles (9) en acier doux disposées d'un côté et de l'autredu circuitmagnéti- que fermé, l'agencement des différentes pièces étant tel qu'après mise en place dudit boîtier isolant (6) sur ladite deuxième branche (8) et insertion dudit aimant permanent (2) entre lesdites demi-branches (12b, 13b) lesdites première (12) et deuxième (13) parties sont solidarisées par l'intermédiaire de rivets (14, 15) et des prolongements (9b) des tôles (9) constituant ledit circuit de dérivation du flux magnétique.The present invention aims to remedy these drawbacks and to this end relates to an ignition coil for internal combustion engines, coil comprising: a closed magnetic circuit (1) consisting of a plurality of sheets cut and stacked one on the other. the others so as to form a rectangular frame with branches of rectangular cross section; a permanent magnet (2) disposed between two half-branches (12b, 13b) defining a first branch (3) of the magnetic circuit; a primary winding (4) and a secondary winding (5) housed in an insulating housing (6) and surrounding a second branch (8) opposite to said first branch (3), coil characterized in that said closed magnetic circuit (1) comprises: a first part (12) U-shaped and having a first thickness (E '); a second L-shaped part (13) having a second thickness (E) greater than said thickness, a branch (12b) of said first part (12) and a branch (13b) of said second part (13) being cut out at a bevel and forming said two half-branches, a magnetic flux bypass circuit consisting of two sheets (9) of mild steel arranged on one side and the other of the closed magnetic circuit, the arrangement of the different parts being such that after placing said insulating housing (6) on said second branch (8) and inserting said permanent magnet (2) between said half-branches (12b, 13b) said first (12) and second (13) parts are secured by means of rivets (14, 15) and extensions (9b) of the sheets (9) constituting said circuit for bypassing the magnetic flux.

Un premier avantage obtenu par cette invention est que la découpe des tôles du circuit magnétique ne requière qu'un outil par partie, ce qui réduit les dépenses concernant les outils de découpe.A first advantage obtained by this invention is that the cutting of the sheets of the magnetic circuit requires only one tool per part, which reduces the expenses relating to the cutting tools.

Un deuxième avantage est la diminution du temps d'assemblage, en raison du fait que les tôles qui, dans la technique antérieure assuraient la solidarisa- tion du circuit magnétique, par recouvrement des extrémités de la branche E', sont supprimées, le circuit magnétique étant solidarisé par un prolongement des tôles constituant le circuit de dérivation du flux magnétique.A second advantage is the reduction in assembly time, due to the fact that the sheets which, in the prior art provided for the joining of the magnetic circuit, by covering the ends of the branch E ', are eliminated, the magnetic circuit being secured by an extension of the sheets constituting the magnetic flux bypass circuit.

La description qui va suivre en regard des dessins annexés fera mieux comprendre comment l'invention peut être réalisée.

  • La figure 1 est une vue longitudinale d'une bobine d'allumage selon l'invention.
  • La figure 2 est une vue de côté suivant la flèche A, de la bobine d'allumage de la figure 1.
  • La figure 3 est une vue de côté, suivant la flèche B, de la bobine d'allumage de la figure 1.
  • La figure 4 est une vue, de dessus, des tôles découpées constituant par empilage les unes sur les autres, les première et deuxième parties du circuit magnétique fermé de la bobine d'allumage de la figure 1.
  • La figure 5 est une vue, de dessus, d'une des deux tôles constituant le circuit de dérivation, du flux magnétique, dont est munie la bobine d'allumage de la figure 1.
The description which follows with reference to the appended drawings will make it easier to understand how the invention can be implemented.
  • Figure 1 is a longitudinal view of an ignition coil according to the invention.
  • Figure 2 is a side view along arrow A of the ignition coil of Figure 1.
  • FIG. 3 is a side view, along arrow B, of the ignition coil of FIG. 1.
  • FIG. 4 is a view, from above, of the cut sheets constituting by stacking one on top of the other, the first and second parts of the closed magnetic circuit of the ignition coil of FIG. 1.
  • FIG. 5 is a top view of one of the two sheets constituting the bypass circuit of the magnetic flux with which the ignition coil of FIG. 1 is provided.

Selon un mode préféré de réalisation, la bobine d'allumage selon l'invention, figure 1, comporte un circuit magnétique fermé 1 constitué de tôles découpées et empilées les unes sur les autres. De façon connue, par la demande française de brevet: FR-A-2476218, un aimant permanent 2, aimanté dans le sens de son épaisseur est disposé dans une branche 3 du circuit magnétique fermé 1,According to a preferred embodiment, the ignition coil according to the invention, FIG. 1, comprises a closed magnetic circuit 1 made up of cut sheets and stacked one on the other. In a known manner, by the French patent application: FR-A-2476218, a permanent magnet 2, magnetized in the direction of its thickness is placed in a branch 3 of the closed magnetic circuit 1,

Un enroulement primaire 4 et un enroulement secondaire 5 logés dans un boîtier isolant 6 noyés dans une résine 7, le boîtier isolant 6 entourant une branche 8 d'épaisseur E', figures 1, 2 et 3.A primary winding 4 and a secondary winding 5 housed in an insulating housing 6 embedded in a resin 7, the insulating housing 6 surrounding a branch 8 of thickness E ′, FIGS. 1, 2 and 3.

De façon connue, par la demande française de brevet FR-A-2486160 le circuit de dérivation du flux magnétique est constitué de deux tôles 9, en acier doux, disposées, par l'intermédiaire de plaquettes isolantes 10 et 11, de part et d'autre des plans définissant l'épaisseur E de la branche 3.In a known manner, by the French patent application FR-A-2486160 the magnetic flux bypass circuit consists of two sheets 9, made of mild steel, arranged, by means of insulating plates 10 and 11, on both sides and d other planes defining the thickness E of the branch 3.

Les tôles 9, cambrées symétrique, comportent une patte 9a, munie d'un trou, ou d'une ouverture, non représentés, de manière à assurer la fixation de la bobine d'allumage sur le véhicule automobile.The sheets 9, symmetrical cambered, comprise a tab 9a, provided with a hole, or with an opening, not shown, so as to ensure the fixing of the ignition coil to the motor vehicle.

Conformément à l'invention, le circuit miagnétique fermé 1, comprend une première partie 12, figures 1 et 4. La première partie 12 est constituée de tôles, découpées en forme de U, comprenant une portion 12a découpée en biseau 12b. Après empilage des tôles les unes sur les autres, la portion 12a forme une demi-branche de la branche 3, et une portion 12c forme la branche 8 du circuit magnétique fermé 1.According to the invention, the closed miagnetic circuit 1 includes a first part 12, figures 1 and 4. The first part 12 consists of sheets, cut into a U-shape, comprising a portion 12a cut in a bevel 12b. After stacking the sheets on top of each other, the portion 12a forms a half-branch of the branch 3, and a portion 12c forms the branch 8 of the closed magnetic circuit 1.

Une deuxième partie 13, du circuit magnétique fermé 1, figures 1 et 4, est constituée de tôles découpées en forme de L, lesquelles tôles comprennent une portion 13a découpée en biseau 13b de manière à former l'autre demi-branche de la branche 3.A second part 13, of the closed magnetic circuit 1, FIGS. 1 and 4, consists of sheets cut out in the shape of an L, which sheets include a portion 13a cut out in bevel 13b so as to form the other half-branch of branch 3 .

Les première et deuxième parties 12 et 13 sontso- lidarisées, à l'aide de moyens connus, tels des rivets 14, 1 et par des prolongements 9b des tôles 9 constituant le circuit de dérivation du flux magnétique.The first and second parts 12 and 13 are joined together, using known means, such as rivets 14, 1 and by extensions 9b of the sheets 9 constituting the circuit for deriving the magnetic flux.

Selon la présente invention, la portion 13a de la deuxième partie 13 du circuit magnétique fermé 1 et l'aimant permanent 2, figure 3 sont en contact avec les tôles 9 du circuit de dérivation du flux magnétique de manière que la réluctance d'entrefer dudit circuit soit équivalente à la réluctance d'entrefer du circuit décrit dans la demande française de brevet FR-A-2486160. En conséquence, les plaquettes 10 et 11 de la présente invention ont une épaisseur égale à 2d par rapport à l'épaisseur d des plaquettes isolantes de la demande française de brevet FR-A-2486 160.According to the present invention, the portion 13a of the second part 13 of the closed magnetic circuit 1 and the permanent magnet 2, FIG. 3 are in contact with the sheets 9 of the magnetic flux bypass circuit so that the air gap reluctance of said circuit is equivalent to the air gap reluctance of the circuit described in the French patent application FR-A-2486160. Consequently, the plates 10 and 11 of the present invention have a thickness equal to 2d relative to the thickness d of the insulating plates of the French patent application FR-A-2486 160.

Selon la présente invention les plaquettes isolantes 10 et 11 viennent de moulage avec le boîtier isolant 6, et leurs faces internes 1 Oa et 11 a constituent un logement pour la portion 1 2a de la première partie 12 du circuit magnétique fermé 1, figure 3.According to the present invention, the insulating plates 10 and 11 are molded with the insulating housing 6, and their internal faces 1 Oa and 11a constitute a housing for the portion 1 2a of the first part 12 of the closed magnetic circuit 1, FIG. 3.

De manière à compenser la différence des épaisseurs E et E' le prolongement 9b des tôles 9 comporte un cambrage 9c, figure 2.In order to compensate for the difference in thicknesses E and E ', the extension 9b of the sheets 9 has a bend 9c, FIG. 2.

Claims (4)

1. Ignition coil for internal-combustion engines, the said coil comprising: a closed magnetic circuit (1) consisting of a plurality of metal sheets cut out and stacked on top of one another to form a rectangular frame with branches of rectangular cross-section; a permanent magnet (2) arranged between two half-branches (12b, 13b) defining a first branch (3) of the magnetic circuit; a primary winding (4) and secondary winding (5) which are accommodated in an insulating housing (6) surrounding a second branch (8) opposite the said first branch (3), the coil being characterised in that the said closed magnetic circuit (1) comprises: a first U-shaped part (12) having a first thickness (E'); a second L-shaped part (13) having a second thickness (E) greater than the said first thickness, one branch (12b) of the said first part (12) and one branch (13b) of the said second part (13) being cut in the form of a bevel and forming the said two half-branches; a magnetic-flux shunt circuit consisting of two soft-steel sheets (9) arranged on both sides of the closed magnetic circuit, the arrangement of the various components being such that, after the said insulating housing (6) has been fitted over the said second branch (8) and the said permanent magnet (2) has been inserted between the said half-branches (12b, 13b), the said first (12) and second (13) parts are fixed to one another by means of rivets (14, 15) and extensions (9b) of the sheets (9) forming the said magnetic-flux shunt circuit.
2. Ignition coil according to Claim 1, characterised in that the portion (13a) of the second part (13) of the closed magnetic circuit (1) and the permanent magnet (2) are in contact with the sheets (9) of the magnetic-flux shunt circuit.
3. Ignition coil according to Claim 1, characterised in that the portion (12a) of the first part (12) of the closed magnetic circuit (1) is arranged inside a receptacle formed by the inner faces (10a, 11 a) of lugs (10, 11) produced integrally with the insulating housing (6).
4. Ignition coil according to Claim 1, characterised in that the extension (9b) of the sheets (9) has a bend (9c) at its end.
EP83901931A 1982-08-11 1983-07-01 Ignition coil for internal combustion engines Expired EP0118454B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8213965A FR2531751A1 (en) 1982-08-11 1982-08-11 IGNITION COIL FOR INTERNAL COMBUSTION ENGINE
FR8213965 1982-08-11

Publications (2)

Publication Number Publication Date
EP0118454A1 EP0118454A1 (en) 1984-09-19
EP0118454B1 true EP0118454B1 (en) 1987-01-07

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EP83901931A Expired EP0118454B1 (en) 1982-08-11 1983-07-01 Ignition coil for internal combustion engines

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US (1) US4546753A (en)
EP (1) EP0118454B1 (en)
DE (1) DE3369027D1 (en)
ES (1) ES273881Y (en)
FR (1) FR2531751A1 (en)
IL (1) IL69457A (en)
IT (1) IT1168780B (en)
MA (1) MA19865A1 (en)
OA (1) OA07655A (en)
PT (1) PT77076B (en)
RO (1) RO88098A (en)
SU (1) SU1292671A3 (en)
UA (1) UA7144A1 (en)
WO (1) WO1984000843A1 (en)

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GB677051A (en) * 1949-12-21 1952-08-06 Philips Electrical Ind Ltd Improvements in or relating to transformers or inductance coils
NL76967C (en) * 1951-04-23
ES425913A1 (en) * 1974-05-03 1976-07-01 Arjona Vallet Improvements introduced in the construction of nucleos for reactances. (Machine-translation by Google Translate, not legally binding)
FR2321054A1 (en) * 1975-08-14 1977-03-11 Sev Marchal IGNITION COIL
FR2476218A1 (en) * 1980-02-20 1981-08-21 Ducellier & Cie IC engine ignition coil winding - is on magnetic circuit branch with junction inclined at angle to permanent magnet
FR2486160A1 (en) * 1980-07-04 1982-01-08 Ducellier & Cie IMPROVEMENT IN IGNITION COILS FOR INTERNAL COMBUSTION ENGINES

Also Published As

Publication number Publication date
RO88098A (en) 1985-11-30
ES273881Y (en) 1985-01-01
MA19865A1 (en) 1984-04-01
PT77076A (en) 1983-08-01
IL69457A0 (en) 1983-11-30
PT77076B (en) 1986-01-27
IT1168780B (en) 1987-05-20
WO1984000843A1 (en) 1984-03-01
FR2531751B1 (en) 1984-12-21
EP0118454A1 (en) 1984-09-19
DE3369027D1 (en) 1987-02-12
RO88098B (en) 1985-10-31
IL69457A (en) 1987-09-16
SU1292671A3 (en) 1987-02-23
UA7144A1 (en) 1995-06-30
FR2531751A1 (en) 1984-02-17
OA07655A (en) 1985-05-23
IT8348829A0 (en) 1983-08-09
ES273881U (en) 1984-06-16
US4546753A (en) 1985-10-15

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