WO1995030992A1 - Ignition coil to be mounted on a spark plug as an individual power supply for said spark plug - Google Patents

Ignition coil to be mounted on a spark plug as an individual power supply for said spark plug Download PDF

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Publication number
WO1995030992A1
WO1995030992A1 PCT/FR1995/000596 FR9500596W WO9530992A1 WO 1995030992 A1 WO1995030992 A1 WO 1995030992A1 FR 9500596 W FR9500596 W FR 9500596W WO 9530992 A1 WO9530992 A1 WO 9530992A1
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WO
WIPO (PCT)
Prior art keywords
spark plug
winding
secondary winding
ignition coil
primary winding
Prior art date
Application number
PCT/FR1995/000596
Other languages
French (fr)
Inventor
Pierre Heritier-Best
Laurent Coste
Original Assignee
Sagem Allumage
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 filed Critical Sagem Allumage
Publication of WO1995030992A1 publication Critical patent/WO1995030992A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines
    • H01F2038/122—Ignition, e.g. for IC engines with rod-shaped core

Definitions

  • Ignition coil intended to be mounted on a spark plug for the individual electrical supply of this spark plug
  • the present invention relates to an ignition coil intended to be mounted on a spark plug for the individual electrical supply of this spark plug.
  • the present invention aims to provide an individual ignition coil intended to be mounted on a spark plug which can in particular be a traditional spark plug.
  • the subject of the invention is an ignition coil intended to be mounted on a spark plug for the individual electrical supply of this spark plug, characterized in that it comprises:
  • a secondary winding wound on the secondary winding connected at its opposite end to the closed end of the winding, to the mass of the primary winding, and at its other end, to means of connection to the spark plug.
  • Such a candle has the advantage of being extremely compact and having very good electrical characteristics.
  • the compactness is notably due to the fact that the primary winding is directly wound on the magnetic core without the interposition of a primary winding. It will also be observed that, since the secondary winding is closed on the high voltage side of the secondary winding, it is possible to obtain very high high voltages while avoiding any risk of the formation of an electric arc between this end. high voltage of the secondary winding and the primary winding.
  • the coil according to the invention comprises:
  • a well insulated unitary assembly is thus obtained, easy to handle and to mount on the candle.
  • the sealing means can be tubular and contain the means of connection to the spark plug, and comprise on the side of the case an outer sealing lip with the case and an inner sealing lip with the secondary coil.
  • This arrangement makes it possible to obtain a good seal during the pouring of the resin into the annular space comprised between the case and the secondary winding.
  • the primary winding protrudes axially from the secondary winding and forms a second part of primary winding over a thickness such that this second part extends radially at least until the secondary winding. It has been found that with such an arrangement a high voltage is obtained which is approximately 10% higher than what would be obtained without this arrangement.
  • the second winding part can be wound on a primary bobbin mounted on the end of the magnetic core.
  • the low voltage connector carrying out the supply of the primary winding is advantageously mounted directly on the magnetic core, and can perform the above function.
  • the high voltage end of the secondary winding is fixed to a metal insert, which directly constitutes the high voltage output of the coil.
  • This arrangement has the advantage of great simplicity.
  • FIGS. 1 and 2 are views in axial section of two coils according to the invention
  • FIG. 3 is an enlarged view of part of FIG. 1,
  • FIG. 4 illustrates the mounting of the coil of FIG. 1 on an engine block
  • FIG. 5 is a simplified partial view from above of FIG. 1, and
  • FIG. 6 is a view on a larger scale of part of FIG. 2.
  • the coil of FIG. 1 comprises a magnetic core 1, consisting for example of a tube of varnished magnetic sheet, filled with a bundle of magnetic wires arranged longitudinally and preferably isolated from one another, for example by a varnish or by surface oxidation.
  • the magnetic core can be made from compacted iron powder.
  • the primary winding 2 consisting here of two layers of a varnished copper wire whose ends 3 and 4 are respectively connected, in the manner which will be described below, to the ground and the low supply voltage.
  • the core 1 coated with the primary winding 2 is introduced inside a secondary winding 5.
  • the latter is produced in a known manner in the form of a tube on the outer surface of which fins are formed 6.
  • the fins 6 delimit between them annular grooves 7 in which are wound in series elementary coils forming the secondary winding.
  • the bobbin 5 is closed at one of its ends by a bottom 9 with which it is made in one piece.
  • the secondary winding On the side opposite the bottom 9, the secondary winding has its end connected to the mass of the primary winding. At its opposite end, the secondary winding is fixed to a high-voltage output insert 10.
  • the insert 10 is a cylindrical piece comprising in its middle part an annular groove 11 in which the end 12 of the secondary winding is wound.
  • the insert 10 is fixed in an axial housing 13 of the bottom 9, for example by gluing. It could also be overmolded during the molding of the bobbin 5.
  • the assembly constituted by the core, the secondary winding 5, the windings 2 and 8 and the insert 10 are introduced into a cylindrical plastic case 14. This case is closed at its lower part and sealed by a silicone tip 15 .
  • the tip 15 is a generally tubular part inside which is disposed a spring 16 for electrical connection with the head of the spark plug.
  • the spring 16 is in contact at one of its ends with the high-voltage output insert 10 and forms at its other end a bi-frustoconical housing enabling the head of the spark plug to be received.
  • This latter end is itself disposed in a housing 17 of corresponding shape, inside the end piece 15 so as to hold the spring 16 in the end piece.
  • the upper part of the nozzle has two annular sealing lips.
  • the outer lip 18 has a shape allowing it to snap into the lower part 19 of corresponding shape of the housing 14. The lip 18 therefore makes it possible to seal the interior of the housing 14 from the outside.
  • the inner lip 20 bears against the lower part of the bottom 9 of the secondary winding 5. This inner lip seals the interior of the housing 14 with respect to the tubular channel inside the end piece 15.
  • the other end of the housing 14 is closed by a plastic cap 21.
  • the cap 21 forms an annular groove 22 against the inner wall of which is housed the upper edge of the housing 14.
  • the groove 22 also allows the centering of the upper part of the coil relative to the engine block 23 on which it is mounted , as shown in Figure 4.
  • the upper part 24 of the spark plug well receives in any suitable manner a tubular ring 25, the upper part of which engages in the part of the groove 22 left free by the box 14.
  • the cap 21 On the side opposite the groove 22, the cap is formed in one piece with the low voltage connector 26.
  • This connector 26 has connection tabs 27 and 28 capable of being connected respectively to the ground and at most of the bass voltage.
  • the cap 21 also has a hole 29 for pouring resin inside the housing 14, as will be explained below.
  • the cap 21 is provided with an extension 30 in which a fixing insert 31 is molded.
  • the tongue 27 is connected to a supply wire 32 at the end of which the mass 3 of the primary winding and the mass of the secondary winding are welded.
  • the tongue 28 is connected to a supply wire 33 at the end of which the low voltage end 4 of the primary winding 2 is welded.
  • the cap 21 finally comprises an inner annular lip 34 bearing on the end of the magnetic core, in order to ensure the cohesion of the assembly.
  • This lip is pierced with a hole 35 allowing the passage of the resin.
  • This resin is poured through the hole 29 to completely drown the inside of the housing 14, namely the annular space 36 between the magnetic core 1 and the secondary coil 5, and the annular space 37 between this secondary coil and the box 14.
  • the sealing is carried out as explained above using the lips 18 and 20 of the nozzle 15.
  • a second part 41 of this winding is wound axially outside the secondary winding 8, itself wound on the secondary winding 5.
  • the part 41 of the primary winding is wound on a winding 42 in which the primary winding wire 43 penetrates by passing through a slot 44 in an end flange 45.
  • the winding part 41 extends over a distance D1 from the axis 46 of the coil. This distance D1 is greater than the distance D2 from the axis at which the secondary winding 8 begins. It has been observed that there was a marked improvement in the electrical characteristics of the coil thanks to this arrangement.
  • the connector 47 is not produced in the form of a cover and is curved at a right angle so that the connection is made not in the axis of the coil but perpendicular to this axis.
  • the bottom of the case 14 ' is produced in the form of a plug 48 crossed by the high-voltage insert 10', which is fixed to the bottom
  • the magnetic core 1 is centered in the secondary winding 5 using a ring 50 forming a spacer.
  • the silicone endpiece 15 ' is here produced in the form of a completely separate piece that is snapped onto a first rigid endpiece 51, itself fixed to the projecting end of the high-voltage insert 10'.
  • the operating principle as well as the advantages of the first embodiment are nevertheless preserved in this second embodiment.

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

Abstract

Ignition coil to be mounted on a spark plug as an individual electric power supply for said spark plug. According to the invention, said coil comprises a cylindrical magnetic core (1), a primary winding (2) directly wound onto the core, a secondary winding sleeve (5) closed at one of its ends and containing the magnetic coil and the primary winding, a secondary winding wound onto the secondary coil, connected at the end opposite to the closed end (9) of the coil, to the earthing contact (3) of the primary winding, and at its other end to means (10) for connection to the spark plug.

Description

Bobine d'allumage destinée à être montée sur une bougie pour l'alimentation électrique individuelle de cette bougie Ignition coil intended to be mounted on a spark plug for the individual electrical supply of this spark plug
La présente invention concerne une bobine d'allumage destinée à être montée sur une bougie pour l'alimentation électrique individuelle de cette bougie.The present invention relates to an ignition coil intended to be mounted on a spark plug for the individual electrical supply of this spark plug.
On connaît déjà par le document EP-A-0 387 993 un ensemble constitué par une bougie solidaire de la partie primaire, basse tension, d'une bobine d'allumage. La partie secondaire, haute tension, de cette bobine est rapportée par dessus la partie primaire. Cet ensemble est donc partiellement solidaire de la bougie et vise à son alimentation individuelle. Cet agencement présente toutefois l'inconvénient de ne pas être compatible avec des bougies traditionnelles.Document EP-A-0 387 993 already discloses an assembly consisting of a spark plug secured to the primary part, low voltage, of an ignition coil. The high voltage secondary part of this coil is attached over the primary part. This set is therefore partially attached to the candle and is intended for its individual supply. However, this arrangement has the disadvantage of not being compatible with traditional candles.
La présente invention vise à fournir une bobine d'allumage individuelle destinée à être montée sur une bougie qui peut être notamment une bougie traditionnelle.The present invention aims to provide an individual ignition coil intended to be mounted on a spark plug which can in particular be a traditional spark plug.
A cet effet, l'invention a pour objet une bobine d'allumage destinée à être montée sur une bougie pour l'alimentation électrique individuelle de cette bougie, caractérisée par le fait qu'elle comprend :To this end, the subject of the invention is an ignition coil intended to be mounted on a spark plug for the individual electrical supply of this spark plug, characterized in that it comprises:
- un noyau magnétique cylindrique ;- a cylindrical magnetic core;
- un enroulement primaire directement bobiné sur le noyau ;- a primary winding directly wound on the core;
- un bobinot secondaire tubulaire fermé à l'une de ses extrémités, à l'intérieur duquel sont disposés le noyau magnétique et l'enroulement primaire ; et- a tubular secondary coil closed at one of its ends, inside which the magnetic core and the primary winding are arranged; and
- un enroulement secondaire bobiné sur le bobinot secondaire, relié à son extrémité opposée à l'extrémité fermée du bobinot, à la masse de l'enroulement primaire, et à son autre extrémité, à des moyens de connexion à la bougie.- A secondary winding wound on the secondary winding, connected at its opposite end to the closed end of the winding, to the mass of the primary winding, and at its other end, to means of connection to the spark plug.
Une telle bougie présente l'avantage d'être extrêmement compacte et de présenter de très bonnes caractéristiques électriques. La compacité est notamment due au fait que l'enroulement primaire est directement bobiné sur le noyau magnétique sans interposition d'un bobinot primaire. On observera par ailleurs que, du fait que le bobinot secondaire est fermé du côté haute tension de l'enroulement secondaire, il est possible d'obtenir des hautes tensions très élevées tout en évitant tout risque de formation d'un arc électrique entre cette extrémité haute-tension de l'enroulement secondaire et l'enroulement primaire.Such a candle has the advantage of being extremely compact and having very good electrical characteristics. The compactness is notably due to the fact that the primary winding is directly wound on the magnetic core without the interposition of a primary winding. It will also be observed that, since the secondary winding is closed on the high voltage side of the secondary winding, it is possible to obtain very high high voltages while avoiding any risk of the formation of an electric arc between this end. high voltage of the secondary winding and the primary winding.
Dans un mode de réalisation particulier, la bobine selon l'invention comprend :In a particular embodiment, the coil according to the invention comprises:
- un boitier externe tubulaire contenant le noyau, le bobinot secondaire et les enroulements primaire et secondaire ;- a tubular external case containing the core, the secondary winding and the primary and secondary windings;
- des moyens d'étanchéificatioπ du boitier du côté de l'extrémité fermée du bobinot ; et- sealing means of the case on the side of the closed end of the bobbin; and
- une résine isolante et de maintien coulée à l'intérieur du boitier et noyant le noyau, le bobinot et les enroulements.- an insulating and holding resin poured inside the case and drowning the core, the bobbin and the windings.
On obtient ainsi un ensemble unitaire bien isolé, facile à manier et à monter sur la bougie.A well insulated unitary assembly is thus obtained, easy to handle and to mount on the candle.
Plus particulièrement, les moyens d'étanchéificatioπ peuvent être tubulaires et contenir les moyens de connexion à la bougie, et comporter du côté du boitier une lèvre extérieure d'étanchéité avec le boitier et une lèvre intérieure d'étanchéité avec le bobinot secondaire.More particularly, the sealing means can be tubular and contain the means of connection to the spark plug, and comprise on the side of the case an outer sealing lip with the case and an inner sealing lip with the secondary coil.
Cet agencement permet d'obtenir une bonne étanchéité lors de la coulée de la résine dans l'espace annulaire compris entre le boitier et le bobinot secondaire.This arrangement makes it possible to obtain a good seal during the pouring of the resin into the annular space comprised between the case and the secondary winding.
Dans un mode de réalisation avantageux, l'enroulement primaire dépasse axiaiement du bobinot secondaire et forme une deuxième partie d'enroulement primaire sur une épaisseur telle que cette deuxième partie s'étend radialement au moins jusqu'à l'enroulement secondaire. On a constaté que l'on obtenait avec un tel agencement une haute-tension supérieure d'environ 10 % à ce que l'on obtiendrait sans cette disposition.In an advantageous embodiment, the primary winding protrudes axially from the secondary winding and forms a second part of primary winding over a thickness such that this second part extends radially at least until the secondary winding. It has been found that with such an arrangement a high voltage is obtained which is approximately 10% higher than what would be obtained without this arrangement.
Plus particulièrement, la deuxième partie d'enroulement peut être bobinée sur un bobinot primaire monté sur l'extrémité du noyau magnétique.More particularly, the second winding part can be wound on a primary bobbin mounted on the end of the magnetic core.
Le connecteur basse tension réalisant l'alimentation du bobinage primaire est avantageusement monté directement sur le noyau magnétique, et peut réaliser la fonction précédente.The low voltage connector carrying out the supply of the primary winding is advantageously mounted directly on the magnetic core, and can perform the above function.
Dans un mode de réalisation particulier, l'extrémité haute tension de l'enroulement secondaire est fixée à un insert métallique, lequel constitue directement la sortie haute tension de la bobine.In a particular embodiment, the high voltage end of the secondary winding is fixed to a metal insert, which directly constitutes the high voltage output of the coil.
Cet agencement présente l'avantage d'une grande simplicité.This arrangement has the advantage of great simplicity.
On décrira maintenant à titre d'exemple non limitatif deux modes de réalisation particuliers de l'invention, en référence aux dessins annexés dans lesquels :Two specific embodiments of the invention will now be described by way of non-limiting example, with reference to the accompanying drawings in which:
- les figures 1 et 2 sont des vues en coupe axiale de deux bobines selon l'invention,FIGS. 1 and 2 are views in axial section of two coils according to the invention,
- la figure 3 est une vue à plus grande échelle d'une partie de la figure 1 ,FIG. 3 is an enlarged view of part of FIG. 1,
- la figure 4 illustre le montage de la bobine de la figure 1 sur un bloc moteur,FIG. 4 illustrates the mounting of the coil of FIG. 1 on an engine block,
- la figure 5 est une vue partielle simplifiée de dessus de la figure 1 , etFIG. 5 is a simplified partial view from above of FIG. 1, and
- la figure 6 est une vue à plus grande échelle d'une partie de la figure 2.FIG. 6 is a view on a larger scale of part of FIG. 2.
La bobine de la figure 1 comprend un noyau magnétique 1 , constitué par exemple d'un tube en tôle magnétique vernie, rempli d'un faisceau de fils de fer magnétique disposés longitudinalement et de préférence isolés les uns des autres, par exemple par un vernis ou par une oxydation superficielle. En variante, le noyau magnétique peut être réalisé en poudre de fer compactée. Sur le noyau 1 est directement bobiné l'enroulement primaire 2, constitué ici de deux couches d'un fil de cuivre verni dont les extrémités 3 et 4 sont respectivement reliées, de la manière qui sera décrite ci-après, à la masse et la basse tension d'alimentation.The coil of FIG. 1 comprises a magnetic core 1, consisting for example of a tube of varnished magnetic sheet, filled with a bundle of magnetic wires arranged longitudinally and preferably isolated from one another, for example by a varnish or by surface oxidation. Alternatively, the magnetic core can be made from compacted iron powder. On the core 1 is directly wound the primary winding 2, consisting here of two layers of a varnished copper wire whose ends 3 and 4 are respectively connected, in the manner which will be described below, to the ground and the low supply voltage.
Le noyau 1 revêtu de l'enroulement primaire 2 est introduit à l'intérieur d'un bobinot secondaire 5. Ce dernier est réalisé de façon connu sous la forme d'un tube à la surface extérieure duquel sont formées des ailettes 6. Les ailettes 6 délimitent entre elles des gorges annulaires 7 dans lesquelles sont bobinées en série des bobines élémentaires formant l'enroulement secondaire.The core 1 coated with the primary winding 2 is introduced inside a secondary winding 5. The latter is produced in a known manner in the form of a tube on the outer surface of which fins are formed 6. The fins 6 delimit between them annular grooves 7 in which are wound in series elementary coils forming the secondary winding.
Le bobinot 5 est fermé à une de ses extrémités par un fond 9 avec lequel il est réalisé d'une seule pièce. Du côté opposé au fond 9 l'enroulement secondaire a son extrémité reliée à la masse de l'enroulement primaire. A son extrémité opposée, l'enroulement secondaire est fixé à un insert de sortie haute tension 10.The bobbin 5 is closed at one of its ends by a bottom 9 with which it is made in one piece. On the side opposite the bottom 9, the secondary winding has its end connected to the mass of the primary winding. At its opposite end, the secondary winding is fixed to a high-voltage output insert 10.
L'insert 10 est une pièce cylindrique comportant dans sa partie médiane une rainure annulaire 11 dans laquelle est enroulée l'extrémité 12 de l'enroulement secondaire. L'insert 10 est fixé dans un logement axial 13 du fond 9, par exemple par collage. Il pourrait également être surmoulé lors du moulage du bobinot 5.The insert 10 is a cylindrical piece comprising in its middle part an annular groove 11 in which the end 12 of the secondary winding is wound. The insert 10 is fixed in an axial housing 13 of the bottom 9, for example by gluing. It could also be overmolded during the molding of the bobbin 5.
L'ensemble constitué par le noyau, le bobinot secondaire 5, les enroulements 2 et 8 et l'insert 10 sont introduit dans un boitier cylindrique en matière plastique 14. Ce boitier est fermé à sa partie inférieure et étanchéifié par un embout en silicone 15.The assembly constituted by the core, the secondary winding 5, the windings 2 and 8 and the insert 10 are introduced into a cylindrical plastic case 14. This case is closed at its lower part and sealed by a silicone tip 15 .
L'embout 15 est une pièce généralement tubulaire à l'intérieur de laquelle est disposé un ressort 16 de liaison électrique avec la tête de la bougie. A cet effet, le ressort 16 est en contact à une de ses extrémités avec l'insert de sortie haute tension 10 et forme à son autre extrémité un logement bi-tronconique permettant de recevoir la tête de la bougie. Cette dernière extrémité est elle- même disposée dans un logement 17 de forme correspondante, intérieur à l'embout 15 de manière à maintenir le ressort 16 dans l'embout. La partie supérieure de l'embout comporte deux lèvres annulaires d'étanchéité. La lèvre extérieure 18 possède une forme lui permettant de s'encliqueter dans la partie inférieure 19 de forme correspondante du boitier 14. La lèvre 18 permet donc d'étanchéifier l'intérieur du boitier 14 vis à vis de l'extérieur. La lèvre intérieure 20 vient en appui contre la partie inférieure du fond 9 du bobinot secondaire 5. Cette lèvre intérieure assure l'etancheification de l'intérieur du boitier 14 vis à vis du canal tubulaire intérieur à l'embout 15.The tip 15 is a generally tubular part inside which is disposed a spring 16 for electrical connection with the head of the spark plug. To this end, the spring 16 is in contact at one of its ends with the high-voltage output insert 10 and forms at its other end a bi-frustoconical housing enabling the head of the spark plug to be received. This latter end is itself disposed in a housing 17 of corresponding shape, inside the end piece 15 so as to hold the spring 16 in the end piece. The upper part of the nozzle has two annular sealing lips. The outer lip 18 has a shape allowing it to snap into the lower part 19 of corresponding shape of the housing 14. The lip 18 therefore makes it possible to seal the interior of the housing 14 from the outside. The inner lip 20 bears against the lower part of the bottom 9 of the secondary winding 5. This inner lip seals the interior of the housing 14 with respect to the tubular channel inside the end piece 15.
L'autre extrémité du boitier 14 est fermée par un capuchon 21 en matière plastique. Le capuchon 21 forme une gorge annulaire 22 contre la paroi intérieure de laquelle vient se loger l'arête supérieure du boitier 14. La gorge 22 permet également le centrage de la partie supérieure de la bobine par rapport au bloc moteur 23 sur lequel elle est montée, comme cela apparaît à la figure 4. A cet effet, la partie supérieure 24 du puits de bougie reçoit de toute manière convenable une bague tubulaire 25, dont la partie supérieure vient s'engager dans la partie de la gorge 22 laissée libre par le boitier 14.The other end of the housing 14 is closed by a plastic cap 21. The cap 21 forms an annular groove 22 against the inner wall of which is housed the upper edge of the housing 14. The groove 22 also allows the centering of the upper part of the coil relative to the engine block 23 on which it is mounted , as shown in Figure 4. For this purpose, the upper part 24 of the spark plug well receives in any suitable manner a tubular ring 25, the upper part of which engages in the part of the groove 22 left free by the box 14.
Du côté opposé à la rainure 22, le capuchon est formé d'une seule pièce avec le connecteur basse tension 26. Ce connecteur 26 comporte des languettes de connexion 27 et 28 susceptibles d'être connectées respectivement à la masse et au plus de la basse tension. Le capuchon 21 comporte par ailleurs un trou 29 permettant de couler de la résine à l'intérieur du boitier 14, comme cela sera exposé ci-après. Le capuchon 21 est muni d'un prolongement 30 dans lequel est surmoulé un insert de fixation 31.On the side opposite the groove 22, the cap is formed in one piece with the low voltage connector 26. This connector 26 has connection tabs 27 and 28 capable of being connected respectively to the ground and at most of the bass voltage. The cap 21 also has a hole 29 for pouring resin inside the housing 14, as will be explained below. The cap 21 is provided with an extension 30 in which a fixing insert 31 is molded.
La languette 27 est reliée à un fil d'alimentation 32 à l'extrémité duquel sont soudées la masse 3 de l'enroulement primaire et la masse de l'enroulement secondaire. De même, la languette 28 est reliée à un fil d'alimentation 33 à l'extrémité duquel est soudée l'extrémité 4 basse tension de l'enroulement primaire 2.The tongue 27 is connected to a supply wire 32 at the end of which the mass 3 of the primary winding and the mass of the secondary winding are welded. Likewise, the tongue 28 is connected to a supply wire 33 at the end of which the low voltage end 4 of the primary winding 2 is welded.
Le capuchon 21 comprend enfin une lèvre annulaire intérieure 34 venant en appui sur l'extrémité du noyau magnétique, afin d'assurer la cohésion de l'ensemble. Cette lèvre est percée d'un trou 35 permettant le passage de la résine. Cette résine est coulée par le trou 29 pour noyer totalement l'intérieur du boitier 14, à savoir l'espace annulaire 36 compris entre le noyau magnétique 1 et le bobinot secondaire 5, et l'espace annulaire 37 compris entre ce bobinot secondaire et le boitier 14. L'étanchéité est réalisée comme cela a été exposé ci-dessus à l'aide des lèvres 18 et 20 de l'embout 15.The cap 21 finally comprises an inner annular lip 34 bearing on the end of the magnetic core, in order to ensure the cohesion of the assembly. This lip is pierced with a hole 35 allowing the passage of the resin. This resin is poured through the hole 29 to completely drown the inside of the housing 14, namely the annular space 36 between the magnetic core 1 and the secondary coil 5, and the annular space 37 between this secondary coil and the box 14. The sealing is carried out as explained above using the lips 18 and 20 of the nozzle 15.
Le mode de réalisation des figures 2 et 6 diffère de ce qui précède par un certain nombre de caractéristiques.The embodiment of Figures 2 and 6 differs from the above in a number of features.
En premier lieu, si la plus grande partie 40 de l'enroulement primaire est toujours bobinée directement sur le noyau magnétique 1 , une deuxième partie 41 de cet enroulement est bobinée axialement à l'extérieur de l'enroulement secondaire 8, lui-même bobiné sur le bobinot secondaire 5. La partie 41 de l'enroulement primaire est bobinée sur un bobinot 42 dans lequel le fil d'enroulement primaire 43 pénètre en passant dans une fente 44 d'un flasque d'extrémité 45.Firstly, if the largest part 40 of the primary winding is still wound directly on the magnetic core 1, a second part 41 of this winding is wound axially outside the secondary winding 8, itself wound on the secondary winding 5. The part 41 of the primary winding is wound on a winding 42 in which the primary winding wire 43 penetrates by passing through a slot 44 in an end flange 45.
La partie d'enroulement 41 s'étend sur une distance D1 à partir de l'axe 46 de la bobine. Cette distance D1 est supérieure à la distance D2 de l'axe à laquelle commence l'enroulement secondaire 8. On a pu constater que l'on obtenait une nette amélioration des caractéristiques électriques de la bobine grâce à cet agencement.The winding part 41 extends over a distance D1 from the axis 46 of the coil. This distance D1 is greater than the distance D2 from the axis at which the secondary winding 8 begins. It has been observed that there was a marked improvement in the electrical characteristics of the coil thanks to this arrangement.
Par ailleurs, dans ce mode de réalisation, le connecteur 47 n'est pas réalisé sous la forme d'un couvercle et est courbé à angle droit de sorte que la connexion s'effectue non pas dans l'axe de la bobine mais perpendiculairement à cet axe.Furthermore, in this embodiment, the connector 47 is not produced in the form of a cover and is curved at a right angle so that the connection is made not in the axis of the coil but perpendicular to this axis.
Dans ce mode de réalisation, le fond du boitier 14' est réalisé sous la forme d'un bouchon 48 traversé par l'insert haute tension 10', lequel est fixé au fondIn this embodiment, the bottom of the case 14 'is produced in the form of a plug 48 crossed by the high-voltage insert 10', which is fixed to the bottom
9' du bobinot secondaire 5 par une cheville 49. Le noyau magnétique 1 est centré dans le bobinot secondaire 5 à l'aide d'une bague 50 formant entretoise.9 ′ of the secondary winding 5 by a pin 49. The magnetic core 1 is centered in the secondary winding 5 using a ring 50 forming a spacer.
Enfin, l'embout en silicone 15' est ici réalisé sous la forme d'une pièce totalement séparée enciiquetée sur un premier embout rigide 51 , lui-même fixé à l'extrémité dépassante de l'insert haute tension 10'. Le principe de fonctionnement ainsi que les avantages du premier mode de réalisation sont néanmoins conservés dans ce second mode de réalisation. Finally, the silicone endpiece 15 'is here produced in the form of a completely separate piece that is snapped onto a first rigid endpiece 51, itself fixed to the projecting end of the high-voltage insert 10'. The operating principle as well as the advantages of the first embodiment are nevertheless preserved in this second embodiment.

Claims

REVENDICATIONS
1. Bobine d'allumage destinée à être montée sur une bougie pour l'alimentation électrique individuelle de cette bougie, caractérisée par le fait qu'elle comprend:1. Ignition coil intended to be mounted on a spark plug for the individual electrical supply of this spark plug, characterized in that it comprises:
- un noyau magnétique cylindrique (1 ) ;- a cylindrical magnetic core (1);
- un enroulement primaire (2) directement bobiné sur le noyau ;- a primary winding (2) directly wound on the core;
- un bobinot secondaire tubulaire (5) fermé à l'une de ses extrémités, à l'intérieur duquel sont disposés le noyau magnétique et l'enroulement primaire ; et- a tubular secondary coil (5) closed at one of its ends, inside which the magnetic core and the primary winding are arranged; and
- un enroulement secondaire bobiné sur le bobinot secondaire, relié à son extrémité opposée à l'extrémité (9) fermée du bobinot, à la masse (3) de l'enroulement primaire, et à son autre extrémité, à des moyens (10) de connexion à la bougie.- a secondary winding wound on the secondary winding, connected at its end opposite the closed end (9) of the winding, to the ground (3) of the primary winding, and at its other end, to means (10) connection to the spark plug.
2. Bobine d'allumage selon la revendication 1 comprenant :2. An ignition coil according to claim 1 comprising:
- un boitier externe tubulaire (14) contenant le noyau, le bobinot secondaire et les enroulements primaire et secondaire ;- a tubular external casing (14) containing the core, the secondary winding and the primary and secondary windings;
- des moyens (18, 20) d'étanchéification du boitier du côté de l'extrémité fermée du bobinot ; et- Means (18, 20) for sealing the housing on the side of the closed end of the bobbin; and
- une résine isolante et de maintien coulée à l'intérieur du boitier et noyant le noyau, le bobinot et les enroulements.- an insulating and holding resin poured inside the case and drowning the core, the bobbin and the windings.
3. Bobine d'allumage selon la revendication 2, dans laquelle les moyens d'étanchéification sont tubulaires et contiennent les moyens (16) de connexion à la bougie, et comportent, du côté du boitier, une lèvre extérieure d'étanchéité (18) avec le boitier et une lèvre intérieure d'étanchéité (20) avec le bobinot secondaire. 3. Ignition coil according to claim 2, in which the sealing means are tubular and contain the means (16) for connection to the spark plug, and comprise, on the side of the housing, an external sealing lip (18) with the housing and an inner sealing lip (20) with the secondary winding.
4. Bobine d'allumage selon l'une quelconque des revendications 1 à 3, dans laquelle l'enroulement primaire dépasse axialement du bobinot secondaire et forme une deuxième partie d'enroulement primaire (41 ) sur une épaisseur telle que cette deuxième partie s'étend radialement au moins jusqu'à l'enroulement secondaire.4. Ignition coil according to any one of claims 1 to 3, in which the primary winding protrudes axially from the secondary winding and forms a second part of primary winding (41) over a thickness such that this second part is extends radially at least until the secondary winding.
5. Bobine d'allumage selon la revendication 4, dans laquelle la deuxième partie d'enroulement primaire est bobinée sur un bobinot primaire (42) monté sur l'extrémité du noyau magnétique.5. An ignition coil according to claim 4, in which the second primary winding part is wound on a primary coil (42) mounted on the end of the magnetic core.
6. Bobine d'allumage selon l'une quelconque des revendications 1 à 5, dans laquelle un connecteur basse tension (26) est monté sur le noyau magnétique.6. Ignition coil according to any one of claims 1 to 5, wherein a low voltage connector (26) is mounted on the magnetic core.
7. Bobinot selon l'une quelconque des revendications 1 à 6, dans lequel l'extrémité haute tension de l'enroulement secondaire est fixée à un insert métallique (10), lequel constitue directement la sortie haute tension de la bobine. 7. Bobbin according to any one of claims 1 to 6, wherein the high voltage end of the secondary winding is fixed to a metal insert (10), which directly constitutes the high voltage output of the coil.
PCT/FR1995/000596 1994-05-10 1995-05-09 Ignition coil to be mounted on a spark plug as an individual power supply for said spark plug WO1995030992A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9405735 1994-05-10
FR9405735A FR2719941B1 (en) 1994-05-10 1994-05-10 Ignition coil intended to be mounted on a spark plug for the individual electrical supply of this spark plug.

Publications (1)

Publication Number Publication Date
WO1995030992A1 true WO1995030992A1 (en) 1995-11-16

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PCT/FR1995/000596 WO1995030992A1 (en) 1994-05-10 1995-05-09 Ignition coil to be mounted on a spark plug as an individual power supply for said spark plug

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WO (1) WO1995030992A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0827165A2 (en) * 1996-08-31 1998-03-04 Toyo Denso Kabushiki Kaisha Engine igniting coil device
EP0848394A1 (en) * 1996-12-10 1998-06-17 General Motors Corporation Integrated ignition coil and spark plug
EP1093134A1 (en) * 1999-10-13 2001-04-18 Sagem S.A. Ignition coil with magnetic core made from iron powder
DE102005043336A1 (en) * 2005-09-12 2007-03-15 Pulse Gmbh Bar ignition transformer for supplying an ignition means, in particular a spark plug of an internal combustion engine, with a high voltage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6845764B1 (en) 2004-01-08 2005-01-25 Delphi Technologies, Inc. Ignition apparatus with secondary winding having reduced breakdown failures

Citations (5)

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Publication number Priority date Publication date Assignee Title
US4352079A (en) * 1981-07-24 1982-09-28 Honeywell Inc. High voltage ignition transformer
DE3620826A1 (en) * 1985-06-22 1987-01-02 Pvl Probosch Vogt Loos Gmbh & Ignition coil integrated with a spark plug connector
GB2199193A (en) * 1986-11-21 1988-06-29 Nippon Denso Co Ignition coil
FR2613779A1 (en) * 1987-04-08 1988-10-14 Electricfil Integrated ignition/transformer unit for controlled-ignition heat engine cylinder
US4985984A (en) * 1986-12-26 1991-01-22 Mitsubishi Denki Kabushiki Kaisha Ignition coil for internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352079A (en) * 1981-07-24 1982-09-28 Honeywell Inc. High voltage ignition transformer
DE3620826A1 (en) * 1985-06-22 1987-01-02 Pvl Probosch Vogt Loos Gmbh & Ignition coil integrated with a spark plug connector
GB2199193A (en) * 1986-11-21 1988-06-29 Nippon Denso Co Ignition coil
US4985984A (en) * 1986-12-26 1991-01-22 Mitsubishi Denki Kabushiki Kaisha Ignition coil for internal combustion engine
FR2613779A1 (en) * 1987-04-08 1988-10-14 Electricfil Integrated ignition/transformer unit for controlled-ignition heat engine cylinder

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0827165A2 (en) * 1996-08-31 1998-03-04 Toyo Denso Kabushiki Kaisha Engine igniting coil device
EP0827165A3 (en) * 1996-08-31 1998-10-28 Toyo Denso Kabushiki Kaisha Engine igniting coil device
EP0951026A2 (en) * 1996-08-31 1999-10-20 Toyo Denso Kabushiki Kaisha Engine igniting coil device
EP0951026A3 (en) * 1996-08-31 2000-04-19 Toyo Denso Kabushiki Kaisha Engine igniting coil device
EP0848394A1 (en) * 1996-12-10 1998-06-17 General Motors Corporation Integrated ignition coil and spark plug
EP1093134A1 (en) * 1999-10-13 2001-04-18 Sagem S.A. Ignition coil with magnetic core made from iron powder
FR2799880A1 (en) * 1999-10-13 2001-04-20 Sagem IGNITION CORE WITH IRON POWDER MAGNETIC CORE
DE102005043336A1 (en) * 2005-09-12 2007-03-15 Pulse Gmbh Bar ignition transformer for supplying an ignition means, in particular a spark plug of an internal combustion engine, with a high voltage

Also Published As

Publication number Publication date
FR2719941A1 (en) 1995-11-17
FR2719941B1 (en) 1996-07-05

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