EP0340083A1 - Ignition coil for internal combustion engines of automobile vehicles and process of fabrication - Google Patents

Ignition coil for internal combustion engines of automobile vehicles and process of fabrication Download PDF

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Publication number
EP0340083A1
EP0340083A1 EP89401123A EP89401123A EP0340083A1 EP 0340083 A1 EP0340083 A1 EP 0340083A1 EP 89401123 A EP89401123 A EP 89401123A EP 89401123 A EP89401123 A EP 89401123A EP 0340083 A1 EP0340083 A1 EP 0340083A1
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EP
European Patent Office
Prior art keywords
housing
ignition coil
magnetic circuit
internal
windings
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
EP89401123A
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German (de)
French (fr)
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EP0340083B1 (en
Inventor
Pierre Heritier-Best
Jean-Marie Autuche
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
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Publication of EP0340083A1 publication Critical patent/EP0340083A1/en
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Publication of EP0340083B1 publication Critical patent/EP0340083B1/en
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    • 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
    • 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
    • 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
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
    • F02P7/021—Mechanical distributors
    • F02P7/026—Distributors combined with other ignition devices, e.g. coils, fuel-injectors
    • 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
    • H01F27/255—Magnetic cores made from particles
    • 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
    • H01F41/02—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 for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means

Definitions

  • the present invention relates to ignition coils for the ignition of internal combustion engines of motor vehicles, and its manufacturing process.
  • Such known ignition coils can be, for example, constituted by a closed magnetic circuit comprising a central core in the shape of an "I”, and two return branches of the magnetic flux in the shape of a "C" arranged at 180 ° from on either side of the central core.
  • the central core and the return branches of the flow are produced by a stack of cut sheets mechanically linked together.
  • a primary winding equipped with two terminals connected respectively to each end of said winding, and a secondary winding equipped with a high-voltage output pin, are arranged coaxially around the central core and between the flux return branches.
  • the assembly is inserted into a housing before pouring a polymerizing synthetic resin therein which will isolate and secure the various elements of the coil leaving only the connection terminals of the primary circuit and the tip of the high output pin visible. voltage.
  • This process is not applicable to an ignition coil for a motor vehicle.
  • the magnetic circuit cannot be molded but is an integral part of the coil.
  • the air gap of the magnetic circuit must be very precise and this precision cannot be reached by orienting the grains of the magnetic circuit before any coating thereof.
  • the present invention proposes to overcome these drawbacks by proposing an ignition coil provided with a magnetic circuit of simple construction, inexpensive, and having better efficiency.
  • an ignition coil in particular for the ignition of internal combustion engines of motor vehicles, of the type comprising a magnetic circuit, two windings, one primary and the other secondary, arranged coaxially around a core of the magnetic circuit, at least one high-voltage output terminal and two connection terminals connected respectively to each of the ends of the primary winding, characterized in that an internal housing is housed in a second housing delimiting between them a free space of substantially constant cross section, space in which the constituent grains are arranged of the magnetic circuit and in that said magnetic circuit is composed of grains of oriented magnetizable material.
  • the coil is produced by the following consecutive steps: - Introduction of the primary and secondary windings, respectively provided with their connection plugs and the high-voltage output, in an internal box. - Introduction of the internal box in a second box. - Installation of grains of magnetizable material in the free space delimited between the boxes. - Supply of one of the windings for grain orientation. - Impregnation of the whole with a synthetic polymerizing resin.
  • An ignition coil 1, shown in Figures 1 to 3 has two coaxially arranged windings, one primary 2 and the other secondary 3.
  • the secondary winding 3 has a pin 31, welded to one end of the winding secondary 3 by a bent part 30, and ends at its end by a high-voltage output 32.
  • the pin 31 is fixed on a spool (not shown) carrying the windings 2 and 3.
  • Each of the ends 22 of the primary winding 2 is connected to a plug 21 (only one being shown) which are also fixed to the spool.
  • the internal housing 4 comprises a first housing 41 of annular shape comprising a bottom 42 and, in its axial part, a second housing 43 of tubular shape with a height greater than the height of the first annular housing 41.
  • the first housing annular 41 and the second tubular housing 43 are in communication by an opening 44 which extends over the entire height of said first housing 41, and are connected, on the one hand, by walls 44 a delimiting the opening 44 and, d on the other hand, by bridges 45 provided for this purpose on the bottom 42 of the internal housing 4.
  • the primary 2 and secondary 3 windings are inserted into the first housing 41.
  • the bent part 30 of the pin 31 passes through the opening 44.
  • the windings 2 and 3 are held inside the first housing 41 so that a substantially constant space remains between said windings 2 and 3 and the internal walls of said first housing 41 by means not shown, such as described for example in French patent application 2,593,962.
  • a cover 5 is then placed on the internal box 4.
  • This annular cover 5 makes it possible to cover the first housing 41, and by its appendage 51, also makes it possible to cover the opening 44 and the part 44 b of the opening 44 extending over the upper part of the second housing 43 higher than the first housing 41.
  • the cover 5 also has a box 52 inside which appear the plugs 21 of the primary winding 2 in order to produce a connector.
  • the internal housing 4 thus equipped is inserted into a second housing 6 produced by molding plastic material in the form of a pot and of a diameter greater than that of said internal housing 4.
  • a plurality of shims 46 are formed on the lower part of the internal housing 4 and consist of radial lugs 46 a and lugs 46 b directed vertically.
  • the length of the vertical legs 46 b is equal to the length of the part 43 a of the second tubular housing 43 which opens out from the bottom 42 of the housing 4.
  • These shims 46 serve to position the internal housing 4 in the second housing 6 so as to delimit a space of substantially constant section between the walls of said internal boxes 4 and the second box 6.
  • particles of magnetizable material such as pure iron are poured into the free space by the boxes 4 and 6 by vibrating the assembly so that said particles fill said space.
  • the space 47 situated between the two annular 46 and tubular housing 34 is in communication with the outside of the internal box 4, that is to say with the inside of the second box 6 thanks to the windows 48 delimited by the bridges 45 connecting the two housings 41 and 43.
  • the particles of magnetizable material thus constitute a magnetic circuit, the central core 7 being housed in space 47, while the flux return circuit 8 is located in space 49 between the two boxes 4 and 6.
  • an air gap is made in part of the circuit, for example in the central core in order to avoid temporary or permanent saturation of said magnetic circuit.
  • the air gap consists of the sum of the spaces between each of the grains constituting the magnetic circuit.
  • a synthetic polymerizing resin 60 is poured inside the second box 6 impregnating the particles of material, and penetrating into the free space, and inside the internal box 4 passing through the upper opening of the tubular housing 43 and through the opening 44 to impregnate the windings 2 and 3.
  • a chimney 61 is made of material by overmolding around the spindle 31 leaving only the high-voltage output 32 to appear.
  • a permanent magnet 9 of annular shape is arranged in the magnetic circuit 7,8 so as to cut the path followed by the magnetic flux.
  • the magnet permanent 9 can be placed in the central core and rest on bridges 45.
  • a housing 100 in the case of a static distribution ignition system, for a four-cylinder engine, has four pots 106 arranged in line and each capable of receiving a coil 101 according to the invention. Cooling fins 102 can be obtained in one piece with the housing 100 and between each pot 106 in order to further improve the heat dissipation.
  • a channel 103 is formed in the housing 100 and allows the passage of the connection wires of the primary circuit up to a connector 104. Such an assembly is particularly suitable for being placed near the cylinders of the engine which the coils light up.

Abstract

The ignition coil (1) comprises a magnetic circuit (7, 8), two windings, primary (2) and secondary (3), arranged coaxially around a core (7) of the magnetic circuit (7, 8). According to the invention, the magnetic circuit (7, 8) consists of grains of magnetisable material which are oriented by powering at least one of the windings (2 or 3) prior to an operation of impregnating a resin (60) polymerising the whole, said grains being arranged within a space defined by the casings (4) and (6). <IMAGE>

Description

La présente invention concerne les bobines d'allumage pour l'allumage des moteurs à combustion interne des véhicules automobiles, et son procédé de fabrication.The present invention relates to ignition coils for the ignition of internal combustion engines of motor vehicles, and its manufacturing process.

De telles bobines d'allumage connues peuvent être, par exemple, constituées d'un circuit magnétique fermé comprenant un noyau central en forme de "I", et deux branches de retour du flux magnétique en forme de "C" disposées à 180° de part et d'autre du noyau central. Le noyau central et les branches de retour du flux sont réalisés par un empilage de tôles découpées et reliées mécaniquement entre elles. Un enroulement primaire équipé de deux bornes reliées respectivement à chacune des extrémités dudit enroulement, et un enroulement secondaire équipé d'une broche de sortie haute-tension, sont disposés coaxialement autour du noyau central et entre les branches de retour de flux. L'ensemble est inséré dans un boîtier avant d'y couler une résine synthétique polymérisante qui isolera et solidarisera les divers éléments de la bobine en ne laissant apparaître que les bornes de connexion du circuit primaire et l'embout de la broche de sortie haute-tension.Such known ignition coils can be, for example, constituted by a closed magnetic circuit comprising a central core in the shape of an "I", and two return branches of the magnetic flux in the shape of a "C" arranged at 180 ° from on either side of the central core. The central core and the return branches of the flow are produced by a stack of cut sheets mechanically linked together. A primary winding equipped with two terminals connected respectively to each end of said winding, and a secondary winding equipped with a high-voltage output pin, are arranged coaxially around the central core and between the flux return branches. The assembly is inserted into a housing before pouring a polymerizing synthetic resin therein which will isolate and secure the various elements of the coil leaving only the connection terminals of the primary circuit and the tip of the high output pin visible. voltage.

Ces bobines donnent de façon générale satisfaction, mais leur réalisation, et notamment la réalisation du circuit magnétique, est onéreuse et leur rendement est moyen. En effet, le découpage des tôles pour leur réalisation est une opération longue et coûteuse et, de plus, engendre de nombreuses chutes pénalisant le coût de fabrication, surtout pour une réalisation en grande série, comme c'est le cas dans l'industrie automobile.These coils are generally satisfactory, but their production, and in particular the production of the magnetic circuit, is expensive and their performance is average. Indeed, cutting the sheets for their production is a long and expensive operation and, moreover, generates numerous falls penalizing the manufacturing cost, especially for a mass production, as is the case in the automotive industry. .

La réalisation d'un entrefer dans le circuit magnétique est nécessaire pour éviter une saturation temporaire ou permanente dudit circuit magnétique et doit naturellement être réalisé de manière très précise pour qu'il fonctionne à un rendement optimum. Il va de soi que des tolérances très serrées pour la réalisation de l'entrefer sont requises et demandent une délicate attention.The production of an air gap in the magnetic circuit is necessary to avoid temporary or permanent saturation of said magnetic circuit and must naturally be carried out very precisely so that it operates at optimum efficiency. It is obvious that very tight tolerances for the realization of the air gap are required and require delicate attention.

Dans le brevet français 1 416 509 on a proposé de réaliser un circuit magnétique pour transformateur à l'aide de poudre métallique que l'on place dans un moule et dont on oriente les grains pendant le durcissement d'un liant.In French patent 1,416,509, it has been proposed to produce a magnetic circuit for a transformer using metallic powder which is placed in a mold and the grains of which are oriented during the hardening of a binder.

Ce procédé n'est pas applicable à une bobine d'allumage pour véhicule automobile.This process is not applicable to an ignition coil for a motor vehicle.

D'une part, pour des raisons de coût, le circuit magnétique ne peut être moulé mais fait partie intégrante de la bobine.On the one hand, for cost reasons, the magnetic circuit cannot be molded but is an integral part of the coil.

D'autre part, la tension au secondaire étant très élevée (quelques dizaines de Kilo Volts) par rapport à la tension au primaire (quelques dizaines de Volts), l'entrefer du circuit magnétique doit être très précis et cette précision ne peut être atteinte qu'en orientant les grains du circuit magnétique avant tout enrobage de ceux-ci.On the other hand, the voltage at the secondary being very high (a few tens of Kilo Volts) compared to the voltage at the primary (a few tens of Volts), the air gap of the magnetic circuit must be very precise and this precision cannot be reached by orienting the grains of the magnetic circuit before any coating thereof.

La présente invention propose de remédier à ces inconvénients en proposant une bobine d'allumage munie d'un circuit magnétique de réalisation simple, peu onéreuse, et ayant un meilleur rendement.The present invention proposes to overcome these drawbacks by proposing an ignition coil provided with a magnetic circuit of simple construction, inexpensive, and having better efficiency.

A cet effet elle concerne une bobine d'allumage, notamment pour l'allumage des moteurs à combustion interne des véhicules automobiles, du type comportant un circuit magnétique, deux enroulements, l'un primaire et l'autre secondaire, disposés coaxialement autour d'un noyau du circuit magnétique, d'au moins une borne de sortie haute-tension et de deux bornes de connexion reliées respectivement à chacune des extrémités de l'enroulement primaire, caractérisée en ce qu'un boîtier interne est logé dans un second boîtier délimitant entre eux un espace libre de section sensiblement constante, espace dans lequel sont disposés les grains constitutifs du circuit magnétique et en ce que ledit circuit magnétique est composé de grains de matériau magnétisable orienté.To this end, it relates to an ignition coil, in particular for the ignition of internal combustion engines of motor vehicles, of the type comprising a magnetic circuit, two windings, one primary and the other secondary, arranged coaxially around a core of the magnetic circuit, at least one high-voltage output terminal and two connection terminals connected respectively to each of the ends of the primary winding, characterized in that an internal housing is housed in a second housing delimiting between them a free space of substantially constant cross section, space in which the constituent grains are arranged of the magnetic circuit and in that said magnetic circuit is composed of grains of oriented magnetizable material.

Selon le procédé d'obtention, la bobine est réalisée par les étapes consécutives suivantes :
- Introduction des enroulements primaire et secondaire, munis respectivement de leurs fiches de connexion et de la sortie haute-tension, dans un boîtier interne.
- Introduction du boîtier interne dans un second boîtier.
- Mise en place des grains de matériau magnétisable dans l'espace libre délimité entre les boîtiers.
- Alimentation de l'un des enroulements pour l'orientation des grains.
- Imprégnation de l'ensemble par une résine synthétique polymérisante.
According to the production process, the coil is produced by the following consecutive steps:
- Introduction of the primary and secondary windings, respectively provided with their connection plugs and the high-voltage output, in an internal box.
- Introduction of the internal box in a second box.
- Installation of grains of magnetizable material in the free space delimited between the boxes.
- Supply of one of the windings for grain orientation.
- Impregnation of the whole with a synthetic polymerizing resin.

La description suivante fait mieux comprendre comment l'invention peut être réalisée en regard des figures annexées, selon lesquelles :

  • - La figure 1 représente une coupe transversale d'une bobine, objet de l'invention.
  • - La figure 2 représente une coupe longitudinale II-II de la figure 1.
  • - La figure 3 représente une coupe longitudinale III-III de la figure 1.
  • - La figure 4 représente en coupe longitudinale une bobine d'allumage munie d'un aimant permanent.
  • - La figure 5 représente, en perspective, un boîtier interne équipant la bobine d'allumage, objet de l'invention.
  • - La figure 6 représente une vue de dessous du boîtier interne de la figure 5.
  • - La figure 7 représente un boîtier de bobine d'allumage selon une variante de l'invention.
The following description makes it easier to understand how the invention can be implemented with reference to the appended figures, according to which:
  • - Figure 1 shows a cross section of a coil, object of the invention.
  • - Figure 2 shows a longitudinal section II-II of Figure 1.
  • - Figure 3 shows a longitudinal section III-III of Figure 1.
  • - Figure 4 shows in longitudinal section an ignition coil provided with a permanent magnet.
  • - Figure 5 shows, in perspective, an internal housing fitted to the ignition coil, object of the invention.
  • - Figure 6 shows a bottom view of the internal box of Figure 5.
  • - Figure 7 shows an ignition coil housing according to a variant of the invention.

Une bobine d'allumage 1, représentée aux figures 1 à 3, comporte deux enroulements disposés coaxialement, l'un primaire 2 et l'autre secondaire 3. L'enroulement secondaire 3 comporte une broche 31, soudée à une extrémité de l'enroulement secondaire 3 par une partie coudée 30, et se termine à son extrémité par une sortie haute-tension 32. La broche 31 est fixée sur un bobineau (non représenté) portant les enroulements 2 et 3. Chacune des extrémités 22 de l'enroulement primaire 2 est connectée à une fiche 21 (une seule étant représentée) qui sont également fixées sur le bobineau.An ignition coil 1, shown in Figures 1 to 3, has two coaxially arranged windings, one primary 2 and the other secondary 3. The secondary winding 3 has a pin 31, welded to one end of the winding secondary 3 by a bent part 30, and ends at its end by a high-voltage output 32. The pin 31 is fixed on a spool (not shown) carrying the windings 2 and 3. Each of the ends 22 of the primary winding 2 is connected to a plug 21 (only one being shown) which are also fixed to the spool.

Les deux enroulements 2 et 3 munis respectivement de leurs bornes 21 et de leur broche 31, sont insérés dans un boîtier interne 4, représenté plus en détail aux figures 5 et 6, réalisé par moulage de matière plastique. A cet effet le boîtier interne 4 comporte un premier logement 41 de forme annulaire comportant un fond 42 et, dans sa partie axiale, un second logement 43 de forme tubulaire d'une hauteur supérieure à la hauteur du premier logement annulaire 41. Le premier logement annulaire 41 et le second logement tubulaire 43 sont en communication par une ouverture 44 qui s'étend sur toute la hauteur dudit premier logement 41, et sont reliés, d'une part, par des parois 44a délimitant l'ouverture 44 et, d'autre part, par des ponts 45 ménagés à cet effet sur le fond 42 du boîtier interne 4.The two windings 2 and 3 provided respectively with their terminals 21 and with their pin 31, are inserted in an internal casing 4, shown in more detail in FIGS. 5 and 6, produced by molding of plastic material. To this end, the internal housing 4 comprises a first housing 41 of annular shape comprising a bottom 42 and, in its axial part, a second housing 43 of tubular shape with a height greater than the height of the first annular housing 41. The first housing annular 41 and the second tubular housing 43 are in communication by an opening 44 which extends over the entire height of said first housing 41, and are connected, on the one hand, by walls 44 a delimiting the opening 44 and, d on the other hand, by bridges 45 provided for this purpose on the bottom 42 of the internal housing 4.

Les enroulements primaire 2 et secondaire 3, munis respectivement de leurs fiches 21 et de leur broche 31, sont insérés dans le premier logement 41. Pour ce faire, la partie coudée 30 de la broche 31 passe par l'ouverture 44. Les enroulements 2 et 3 sont maintenus à l'intérieur du premier logement 41 de manière à ce qu'un espace sensiblement constant subsiste entre lesdits enroulements 2 et 3 et les parois internes dudit premier logement 41 par des moyens non représentés, tels que décrits par exemple dans la demande de brevet français 2 593 962.The primary 2 and secondary 3 windings, respectively provided with their plugs 21 and their pin 31, are inserted into the first housing 41. To do this, the bent part 30 of the pin 31 passes through the opening 44. The windings 2 and 3 are held inside the first housing 41 so that a substantially constant space remains between said windings 2 and 3 and the internal walls of said first housing 41 by means not shown, such as described for example in French patent application 2,593,962.

Un couvercle 5 est alors disposé sur le boîtier interne 4. Ce couvercle 5 de forme annulaire permet de couvrir le premier logement 41, et par son appendice 51, permet également de couvrir l'ouverture 44 et la partie 44b de l'ouverture 44 s'étendant sur la partie supérieure du second logement 43 plus haute que le premier logement 41. Le couvercle 5 présente également un caisson 52 à l'intérieur duquel apparaissent les fiches 21 de l'enroulement primaire 2 afin de réaliser un connecteur.A cover 5 is then placed on the internal box 4. This annular cover 5 makes it possible to cover the first housing 41, and by its appendage 51, also makes it possible to cover the opening 44 and the part 44 b of the opening 44 extending over the upper part of the second housing 43 higher than the first housing 41. The cover 5 also has a box 52 inside which appear the plugs 21 of the primary winding 2 in order to produce a connector.

Le boîtier interne 4 ainsi équipé est inséré dans un second boîtier 6 réalisé par moulage de matière plastique en forme de pot et d'un diamètre supérieur à celui dudit boîtier interne 4.The internal housing 4 thus equipped is inserted into a second housing 6 produced by molding plastic material in the form of a pot and of a diameter greater than that of said internal housing 4.

A cet effet, une pluralité de cales 46 sont ménagées sur la partie inférieure du boîtier interne 4 et se composent de pattes radiales 46a et de pattes 46b dirigées verticalement. La longueur des pattes verticales 46b est égale à la longueur de la patie 43a du second logement tubulaire 43 qui débouche du fond 42 du boîtier 4. Ces cales 46 servent à positionner le boîtier interne 4 dans le second boîtier 6 de façon à délimiter un espace de section sensiblement constante entre les parois desdits boîtiers internes 4 et le second boîtier 6.To this end, a plurality of shims 46 are formed on the lower part of the internal housing 4 and consist of radial lugs 46 a and lugs 46 b directed vertically. The length of the vertical legs 46 b is equal to the length of the part 43 a of the second tubular housing 43 which opens out from the bottom 42 of the housing 4. These shims 46 serve to position the internal housing 4 in the second housing 6 so as to delimit a space of substantially constant section between the walls of said internal boxes 4 and the second box 6.

Selon l'invention, des particules de matériau magnétisable, tel que du fer pur, sont versées dans l'espace libre par les boîtiers 4 et 6 en faisant vibrer l'ensemble de manière à ce que lesdites particules comblent ledit espace. Il est à noter que l'espace 47 situé entre les deux logements annulaire 46 et tubulaire 34 est en communication avec l'extérieur du boîtier interne 4, c'est-à-dire avec l'intérieur du second boîtier 6 grâce aux fenêtres 48 délimitées par les ponts 45 de liaison entre les deux logements 41 et 43. Les particules de matériau magnétisable constituent ainsi un circuit magnétique, le noyau central 7 étant logé dans l'espace 47, tandis que le circuit de retour de flux 8 se situe dans l'espace 49 entre les deux boîtiers 4 et 6.According to the invention, particles of magnetizable material, such as pure iron, are poured into the free space by the boxes 4 and 6 by vibrating the assembly so that said particles fill said space. It should be noted that the space 47 situated between the two annular 46 and tubular housing 34 is in communication with the outside of the internal box 4, that is to say with the inside of the second box 6 thanks to the windows 48 delimited by the bridges 45 connecting the two housings 41 and 43. The particles of magnetizable material thus constitute a magnetic circuit, the central core 7 being housed in space 47, while the flux return circuit 8 is located in space 49 between the two boxes 4 and 6.

Lorsque l'espace libre 47,49 est rempli de particules jusqu'à ce que le boîtier 2 soit recouvert d'une épaisseur sensiblement égale à l'espace entre les deux boîtiers 4 et 6, la partie supérieure 44c du logement tubulaire 43 restant seule apparente, l'enroulement primaire 2 est alimenté pendant quelques secondes. L'alimentation a pour effet d'orienter les particules de fer constituant le circuit magnétique 7,8 qui, de ce fait, aura un meilleur rendement.When the free space 47, 49 is filled with particles until the housing 2 is covered with a thickness substantially equal to the space between the two housings 4 and 6, the upper part 44 c of the tubular housing 43 remaining only apparent, the primary winding 2 is supplied for a few seconds. The power has the effect of orienting the iron particles constituting the magnetic circuit 7,8 which, therefore, will have a better efficiency.

Dans les circuits magnétiques classiques, un entrefer est réalisé dans une partie du circuit, par exemple dans le noyau central afin d'éviter une saturation temporaire ou permanente dudit circuit magnétique. Selon l'invention, l'entrefer est constitué de la somme des espaces entre chacun des grains constitutifs du circuit magnétique. Ainsi, celui-ci sera ajusté à l'entrefer théorique calculé en choisissant la grosseur des grains qui devront être par conséquent calibrés.In conventional magnetic circuits, an air gap is made in part of the circuit, for example in the central core in order to avoid temporary or permanent saturation of said magnetic circuit. According to the invention, the air gap consists of the sum of the spaces between each of the grains constituting the magnetic circuit. Thus, this will be adjusted to the theoretical air gap calculated by choosing the size of the grains which must therefore be calibrated.

Cette opération terminée, une résine synthétique poléymérisante 60 est coulée à l'intérieur du second boîtier 6 imprégnant les particules de matériau, et pénétrant dans l'espace libre, et à l'intérieur du boîtier interne 4 en passant par l'ouverture supérieure du logement tubulaire 43 et par l'ouverture 44 pour imprégner les enroulements 2 et 3. De plus, une cheminée 61 est réalisée de matière par surmoulage autour de la broche 31 ne laissant apparaître que la sortie haute-tension 32.Once this operation is complete, a synthetic polymerizing resin 60 is poured inside the second box 6 impregnating the particles of material, and penetrating into the free space, and inside the internal box 4 passing through the upper opening of the tubular housing 43 and through the opening 44 to impregnate the windings 2 and 3. In addition, a chimney 61 is made of material by overmolding around the spindle 31 leaving only the high-voltage output 32 to appear.

Selon une variante de l'invention représentée à la figure 4, un aimant permanent 9 de forme annulaire est disposé dans le circuit magnétique 7,8 de manière à couper le chemin suivi par le flux magnétique. L'aimant permanent 9 pourra être disposé dans le noyau central et reposer sur les ponts 45.According to a variant of the invention shown in Figure 4, a permanent magnet 9 of annular shape is arranged in the magnetic circuit 7,8 so as to cut the path followed by the magnetic flux. The magnet permanent 9 can be placed in the central core and rest on bridges 45.

Selon une autre variante de l'invention, représentée aux figures 7 et 8, dans le cas d'un système d'allumage à distribution statique, pour un moteur à quatre cylindres, un boîtier 100, avantageusement réalisé pour une dissipation thermique par moulage d'alliage métallique amagnétique tel que aluminium, comporte quatre pots 106 disposés en ligne et pouvant recevoir chacun une bobine 101 conforme à l'invention. Des ailettes de refroidissement 102 peuvent être obtenues de matière avec le boîtier 100 et entre chaque pot 106 afin d'améliorer encore plus la dissipation thermique. Un canal 103 est ménagé dans le boîtier 100 et permet le passage des fils de raccordement du circuit primaire jusqu'à un connecteur 104. Un tel ensemble est particulièrement adapté à être placé à proximité des cylindres du moteur qu'allument les bobines.According to another variant of the invention, shown in FIGS. 7 and 8, in the case of a static distribution ignition system, for a four-cylinder engine, a housing 100, advantageously produced for heat dissipation by molding d 'non-magnetic metal alloy such as aluminum, has four pots 106 arranged in line and each capable of receiving a coil 101 according to the invention. Cooling fins 102 can be obtained in one piece with the housing 100 and between each pot 106 in order to further improve the heat dissipation. A channel 103 is formed in the housing 100 and allows the passage of the connection wires of the primary circuit up to a connector 104. Such an assembly is particularly suitable for being placed near the cylinders of the engine which the coils light up.

Claims (9)

1) Bobine d'allumage, notamment pour l'allumage des moteurs à combustion interne des véhicules automobiles, du type comportant un circuit magnétique (7,8), deux enroulements, l'un primaire (2) et l'autre secondaire (3), disposés coaxialement autour d'un noyau (7) du circuit magnétique (7,8), d'au moins une borne de sortie haute-tension (32) reliée à l'enroulement secondaire (3) et de deux bornes de connexion (21) reliées respectivement à chacune des extrémités (22) de l'enroulement primaire (2), caractérisée en ce que le boîtier interne (4) est logé dans un second boîtier (6) délimitant entre eux un espace libre de section sensiblement constante, espace dans lequel sont disposés les grains constitutifs du circuit magnétique (7,8) et en ce que ledit circuit magnétique (7,8), est composé de grains de matériau magnétisable orientés.1) Ignition coil, in particular for the ignition of internal combustion engines of motor vehicles, of the type comprising a magnetic circuit (7,8), two windings, one primary (2) and the other secondary (3 ), arranged coaxially around a core (7) of the magnetic circuit (7,8), at least one high-voltage output terminal (32) connected to the secondary winding (3) and two connection terminals (21) connected respectively to each of the ends (22) of the primary winding (2), characterized in that the internal housing (4) is housed in a second housing (6) delimiting between them a free space of substantially constant section , space in which the grains constituting the magnetic circuit (7,8) are arranged and in that said magnetic circuit (7,8) is composed of grains of oriented magnetizable material. 2) Bobine d'allumage, selon la revendication1, caractérisée en ce que le circuit magnétique (7,8) est composé de grains de fer pur.2) Ignition coil according to claim1, characterized in that the magnetic circuit (7,8) is composed of grains of pure iron. 3) Bobine d'allumage, selon la revendication1, caractérisée en ce qu'un boîtier interne (4) cylindrique délimite un premier logement annulaire (41) logeant les enroulements primaire (2) et secondaire (3), et un second logement axial tubulaire (43) dans lequel est logée une broche (31) de la sortie haute-tension (32).3) Ignition coil, according to claim1, characterized in that an internal cylindrical housing (4) delimits a first annular housing (41) housing the primary (2) and secondary (3) windings, and a second axial tubular housing (43) in which is housed a pin (31) of the high-voltage output (32). 4) Bobine d'allumage, selon la revendication 3, caractérisée en ce que les premier et second logements (41 et 43) sont en communication par une ouverture (44).4) Ignition coil according to claim 3, characterized in that the first and second housings (41 and 43) are in communication by an opening (44). 5) Bobine d'allumage, selon la revendication 1, caractérisée en ce que le boîtier interne (4) comporte des moyens de centrage et de positionnement à l'intérieur du second boîtier (6).5) Ignition coil according to claim 1, characterized in that the internal housing (4) comprises centering and positioning means inside the second housing (6). 6) Bobine d'allumage, selon la revendication 5, caractérisée en ce que les moyens de centrage sont constitués d'une pluralité d'entretoises en forme de pattes verticales (46b) pour le positionnement axial et radiales (46a) pour le centrage.6) Ignition coil according to claim 5, characterized in that the centering means are consisting of a plurality of spacers in the form of vertical legs (46 b ) for axial positioning and radial (46 a ) for centering. 7) Bobine d'allumage selon l'une quelconque des revendications 1 à 4, caractérisée en ce qu'un aimant permanent (9) est disposé dans le circuit magnétique (7,8).7) Ignition coil according to any one of claims 1 to 4, characterized in that a permanent magnet (9) is arranged in the magnetic circuit (7,8). 8) Bobine d'allumage, selon l'une quelconque des revendications précédentes, caractérisée en ce qu'un boîtier amagnétique (100) comporte quatre pots (106) en ligne dans chacun desquels est logée une bobine (101) conforme à l'invention, et en ce qu'un canal (103) longe tangentiellement lesdits pots (106) et rassemble succesivement les fils de connexion de chacune des bobines (101) pour les diriger vers l'une des extrémités du boîtier (100).8) Ignition coil according to any one of the preceding claims, characterized in that a non-magnetic housing (100) comprises four pots (106) in line in each of which is housed a coil (101) according to the invention , and in that a channel (103) tangentially runs along said pots (106) and successively gathers the connection wires of each of the coils (101) to direct them towards one of the ends of the housing (100). 9) Procédé d'obtention d'une bobine d'allumage selon l'une au moins des revendications précédentes, caractérisé par les étapes consécutives suivantes :
- Introduction des enroulements primaire (2) et secondaire (3), munis respectivement de leurs fiches de connexion (21) et de la sortie haute-tension (32) dans le boîtier interne (4).
- Introduction du boîtier interne (4) dans le second boîtier (6).
- Mise en place des grains de matériau magnétisable dans l'espace libre délimité entre les boîtiers (4) et (6).
- Alimentation de l'un des enroulements pour l'orientation des grains.
- Imprégnation de l'ensemble par une résine synthétique polymérisante (60).9) Method for obtaining an ignition coil according to at least one of the preceding claims, characterized by the following consecutive steps:
- Introduction of the primary (2) and secondary (3) windings, respectively provided with their connection plugs (21) and the high-voltage output (32) in the internal housing (4).
- Introduction of the internal box (4) in the second box (6).
- Installation of grains of magnetizable material in the free space delimited between the boxes (4) and (6).
- Supply of one of the windings for grain orientation.
- Impregnation of the whole with a synthetic polymerizing resin (60).
EP19890401123 1988-04-28 1989-04-21 Ignition coil for internal combustion engines of automobile vehicles and process of fabrication Expired - Lifetime EP0340083B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805673 1988-04-28
FR8805673A FR2630782B1 (en) 1988-04-28 1988-04-28 IGNITION COIL FOR IGNITION OF INTERNAL COMBUSTION ENGINES OF MOTOR VEHICLES, AND MANUFACTURING METHOD THEREOF

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EP0340083A1 true EP0340083A1 (en) 1989-11-02
EP0340083B1 EP0340083B1 (en) 1994-07-13

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EP (1) EP0340083B1 (en)
JP (1) JP3011943B2 (en)
DE (1) DE68916690T2 (en)
FR (1) FR2630782B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512357A2 (en) * 1991-05-03 1992-11-11 Cooper Industries Italia S.p.A. A plug-top coil-ignition unit for an internal combustion engine
EP0579487A2 (en) * 1992-07-16 1994-01-19 Sumitomo Wiring Systems, Ltd. Coupling construction
EP0637856A1 (en) * 1993-08-05 1995-02-08 Sumitomo Wiring Systems, Ltd. Connector construction for ignition system
WO2008017631A2 (en) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Method for producing a coil, in particular an ignition coil for a motor vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3951205B2 (en) * 1998-05-19 2007-08-01 株式会社デンソー Power steering method and power steering apparatus
JP5157956B2 (en) * 2009-02-25 2013-03-06 株式会社デンソー Reactor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701865A (en) * 1952-05-31 1955-02-08 Essex Wire Corp Ignition coil
FR1416509A (en) * 1964-09-23 1965-11-05 Parisienne De Const Electro Me Molded magnetic circuit
FR2013280A1 (en) * 1968-07-19 1970-03-27 Pal Magneton
FR2057059A7 (en) * 1969-08-08 1971-05-07 Eltra Corp
FR2593962A1 (en) * 1986-01-24 1987-08-07 Ducellier & Cie Closed-circuit ignition coil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701865A (en) * 1952-05-31 1955-02-08 Essex Wire Corp Ignition coil
FR1416509A (en) * 1964-09-23 1965-11-05 Parisienne De Const Electro Me Molded magnetic circuit
FR2013280A1 (en) * 1968-07-19 1970-03-27 Pal Magneton
FR2057059A7 (en) * 1969-08-08 1971-05-07 Eltra Corp
FR2593962A1 (en) * 1986-01-24 1987-08-07 Ducellier & Cie Closed-circuit ignition coil

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512357A2 (en) * 1991-05-03 1992-11-11 Cooper Industries Italia S.p.A. A plug-top coil-ignition unit for an internal combustion engine
EP0512357A3 (en) * 1991-05-03 1992-12-09 Industrie Magneti Marelli S.P.A. A plug-top coil-ignition unit for an internal combustion engine
EP0579487A2 (en) * 1992-07-16 1994-01-19 Sumitomo Wiring Systems, Ltd. Coupling construction
EP0579487A3 (en) * 1992-07-16 1995-01-18 Sumitomo Wiring Systems Coupling construction.
EP0637856A1 (en) * 1993-08-05 1995-02-08 Sumitomo Wiring Systems, Ltd. Connector construction for ignition system
US5547387A (en) * 1993-08-05 1996-08-20 Sumitomo Wiring Systems, Ltd. Joint construction for ignition system
WO2008017631A2 (en) * 2006-08-09 2008-02-14 Robert Bosch Gmbh Method for producing a coil, in particular an ignition coil for a motor vehicle
WO2008017631A3 (en) * 2006-08-09 2008-04-10 Bosch Gmbh Robert Method for producing a coil, in particular an ignition coil for a motor vehicle
US8230584B2 (en) 2006-08-09 2012-07-31 Robert Bosch Gmbh Method for producing a coil, in particular an ignition coil for a motor vehicle

Also Published As

Publication number Publication date
FR2630782B1 (en) 1993-05-14
JP3011943B2 (en) 2000-02-21
DE68916690D1 (en) 1994-08-18
JPH01316915A (en) 1989-12-21
EP0340083B1 (en) 1994-07-13
DE68916690T2 (en) 1995-04-06
FR2630782A1 (en) 1989-11-03

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