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EP0344387B1 - Ignition unit comprising a combined spark plug and transformer for a cylinder of a thermal engine with spark ignition - Google Patents

Ignition unit comprising a combined spark plug and transformer for a cylinder of a thermal engine with spark ignition Download PDF

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Publication number
EP0344387B1
EP0344387B1 EP19880420174 EP88420174A EP0344387B1 EP 0344387 B1 EP0344387 B1 EP 0344387B1 EP 19880420174 EP19880420174 EP 19880420174 EP 88420174 A EP88420174 A EP 88420174A EP 0344387 B1 EP0344387 B1 EP 0344387B1
Authority
EP
European Patent Office
Prior art keywords
spark plug
coil
sleeve
assembly
assembly according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19880420174
Other languages
German (de)
French (fr)
Other versions
EP0344387A1 (en
Inventor
Philippe François Marie Biton
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.)
Electricfil Industrie SARL
Electricfil SA
Original Assignee
Electricfil Industrie SARL
Electricfil SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR8705238A priority Critical patent/FR2613779B1/en
Application filed by Electricfil Industrie SARL, Electricfil SA filed Critical Electricfil Industrie SARL
Priority to ES88420174T priority patent/ES2067484T3/en
Priority to EP19880420174 priority patent/EP0344387B1/en
Priority to DE19883852300 priority patent/DE3852300T2/en
Publication of EP0344387A1 publication Critical patent/EP0344387A1/en
Application granted granted Critical
Publication of EP0344387B1 publication Critical patent/EP0344387B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/40—Sparking plugs structurally combined with other devices
    • H01T13/44—Sparking plugs structurally combined with other devices with transformers, e.g. for high-frequency ignition
    • 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

  • the present invention relates to the technical field of heat engines, more particularly, of the explosion and spark-ignition type.
  • the engines of the above type include, for each cylinder that they comprise, a spark plug mounted on the cylinder head so that the electrodes which it possesses are arranged inside the combustion chamber of the cylinder.
  • a spark plug must be supplied with electric current so as to produce an ignition spark between its electrodes for each operating cycle of the cylinder.
  • Such an installation is known, on the one hand, to be the source of electrical leaks due, mainly, to the length of the high-voltage cables and to the presence of humidity and deposits of various materials favoring the maintenance of this humidity and, on the other hand, to emit parasites harmful to the proper functioning of radio installations.
  • Another proposal of the prior art has been to place an electronic distribution on a low voltage cable leading to a multi-output transformer group connected by high voltage cables to the different plugs.
  • the present invention aims to remedy the above drawbacks by proposing an integrated transformer-ignition block, of particularly simple and reliable construction, designed to be associated, individually, with a spark plug. ignition of traditional construction and requiring, for its adaptation on an existing heat engine, no fundamentally important structural modification.
  • the integrated transformer-ignition block comprises the characteristics defined in claim 1.
  • Fig. 1 is a schematic view illustrating the objective that the invention achieves.
  • Fig. 2 is a partially cutaway elevation view of the subject of the invention.
  • Fig. 3 is a view of the electrical diagram of one of the constituent elements of the subject of the invention.
  • Fig. 1 shows, diagrammatically, an installation for ignition of an internal combustion engine 1 of the explosion-ignition type.
  • the engine 1 is illustrated, by way of example, in the form of an assembly comprising four cylinders 2 which must be selectively controlled by ignition, in a predetermined order. It is obvious that the invention can be applied to any engine comprising a different number of cylinders 2 .
  • An ignition installation 3 of such an engine 1 comprises an electrical energy source 4 connected by a low voltage cable 5 to a distribution means 6 associated with a block of control 6 a and itself connected by low voltage cables 7 to each of the spark plugs 8 mounted on the cylinder head 9 of the engine 1 .
  • each block 10 comprises a tubular body 11 , in any suitable material, in particular metallic or in charged conductive plastic, in order to constitute an electromagnetic shielding.
  • the body 11 defines, on either side of an annular shoulder 12 , a thread 13 and a housing 14 , preferably coaxial, opening, respectively, at each of the ends of the tubular body 11 .
  • the body 11 can be produced in a single piece or in two parts which can be assembled in a sealed manner.
  • the internal thread 13 is intended for mounting the body 11 on a spark plug 15 comprising a barrel 16 connected by a base 17 to a flange 18 from which extends a base 19 provided with electrodes 20 and 21 .
  • the spark plug 15 comprises, for this purpose, on the base 17 , a thread 22 complementary to the internal thread 13 which has an axial length slightly less than the height of the base 17 .
  • the sealed assembly, between the internal thread 13 and the base 17 is ensured by a seal 23 subjected to crushing between the open transverse end of the tubular body 11 and the flange 18 .
  • the axial length relationship between the internal thread 13 and the thread 17 is also determined so as to involve, after partial crushing of the seal 23 , a positive abutment of the base 17 against the shoulder 12 .
  • the housing 14 contains a transformer coil 24 embedded in a dielectric coating 25 ensuring its centering in the housing 14 , as well as its axial immobilaton.
  • the coating 25 can form a collar 26 immobilized axially in abutment against a shoulder 27 of the housing 14 , by a closure plug 28 .
  • the transformer coil 24 passes through the tubular body 11 by a connector 29 designed in any way suitable for allow mechanical and electrically efficient connection with a low voltage connection cable 7 .
  • the connector 29 has three connection terminals, two of which are connected to a primary winding E1 ( FIG. 3 ) and the other of which is connected to a secondary winding E2 connected to a contact terminal 30 placed inside the body 11 .
  • the terminal 30 is surrounded by an end piece 31 for adapting a sleeve 32 of dielectric material, placed in the housing 14 between the coil 24 and the shoulder 12 .
  • the sleeve 32 axially delimits a bore 33 allowing the tight fitting of the barrel 16 of a spark plug 15 .
  • the sleeve 32 is preferably designed and produced from an elastomer capable of accepting an elastic deformation, in particular in a radial direction, from the bore 33 .
  • the adapter 31 is made to allow snap fitting of the sleeve 32 around the terminal 30 which is preferably constituted by an elastically retractable stud 34 and intended to cooperate with an olive 35 usually fitted to the upper end cask 16 .
  • the mounting of the tubular body 11 on a spark plug 15 makes it possible to produce a unitary block in which the olive 35 is in permanent contact with the stud 34 of the coil 24 .
  • the contact surfaces, between the stud 34 and the olive 35 are confined inside the bore 33 which is isolated from the ambient environment by the upper closure plug 28 and by the presence of the seal. seal 23 and by tightening the sleeve 32 on the barrel 16 . This eliminates any risk of the introduction of foreign bodies and moisture which could interfere with good electrical contact.
  • the tubular body 11 is preferably made so as to present a housing 14 of diameter, notably, larger than that of the internal thread 13 , so as to admit a sleeve 32 of large radial thickness.
  • the block 10 makes it possible to produce a unitary assembly integrating the function of transforming the low voltage supply current into high voltage and the ignition function inside a cylinder.
  • the transmission of a high voltage current takes place directly between the contact pad 34 and the olive 35 and thus makes it possible to remove any cable and connection end pieces liable to be the source of leakage, breakdown, loss. of energy and loss of dielectric continuity.
  • the integrated transformer-ignition block according to the invention can be produced in a practical and efficient manner by being subjected, in the factory, to the various functional and leakage checks. Such a block can thus be adapted directly to a spark plug without involving any operations other than screwing the latter into the thread 13 , after interposition of the seal 23 .
  • the applied tightening torque can be precisely appreciated, between respectively adapted tightening tools on the base 18 and on a head 36 , for example, with a hexagon.
  • the object of the invention can thus be mounted in a unitary form prior to the adaptation of the spark plug 15 on the cylinder or even be formed after the traditional adaptation of this candle on the cylinder.
  • the function of the tapping 13 is to carry out the adaptation of the body 11 on a spark plug 15 without transmission of stress to the barrel 16 .
  • Another assembly means could also be provided for this purpose.
  • an assembly of the type with wedging by conjugated cones could also be envisaged.
  • the block according to the invention can be adapted to any type of spark plug mounted on traditional cylinder heads or delimiting deep implantation wells.
  • the tubular body 11 is then preferably associated with an elastomer ring 37 capable of ensuring a centering and guiding the tubular body 11 , as well as a closing function opposing the introduction of any foreign body into the well.
  • the ring 37 can also have the function of limiting the mechanical stresses liable to be transmitted to the base 17 by the operating vibrations applied to the mass represented by the integrated transformer-ignition block.
  • the body 11 delimits a housing 14 and a coaxial thread 13 and contains a coil 24 and a sleeve 32 also coaxial.
  • the sleeve 32 could be an integral part of the coating 25 of the coil 24 .
  • the constitution in integrated form of a transformer-ignition block has, compared to the prior art, the advantages of reducing losses between the coil and the spark plug, of ensuring a better seal facilitating cold starts and of decreasing very notably the emission of radio interference, more particularly, if the body 11 is made of a magnetic metallic material constituting a shielding of the coil and of the spark plug.
  • This construction can also be envisaged for ignition systems of the inductive or capacitive type.
  • the body 11 could be produced in two component parts assembled, in particular by screwing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)

Description

La présente invention vise le domaine technique des moteurs thermiques, plus particulièrement, du type à explosion et à allumage commandé.The present invention relates to the technical field of heat engines, more particularly, of the explosion and spark-ignition type.

Les moteurs, du type ci-dessus, comprennent, pour chaque cylindre qu'ils comportent, une bougie d'allumage montée sur la culasse pour que les électrodes qu'elle possède soient disposées à l'intérieur de la chambre de combustion du cylindre. Une telle bougie d'allumage doit être alimentée en courant électrique de façon à produire une étincelle d'allumage entre ses électrodes pour chaque cycle de fonctionnement du cylindre.The engines of the above type include, for each cylinder that they comprise, a spark plug mounted on the cylinder head so that the electrodes which it possesses are arranged inside the combustion chamber of the cylinder. Such a spark plug must be supplied with electric current so as to produce an ignition spark between its electrodes for each operating cycle of the cylinder.

Jusqu'à présent, l'alimentation d'une telle bougie était assurée à partir d'une source de production d'électricité en faisant intervenir une bobine transformatrice recevant du courant basse-tension de la source et raccordée par un câble haute tension à un distributeur mécanique, généralement du type à doigt tournant, raccordé par des câbles haute tension à chacune des bougies du moteur.Until now, the supply of such a candle was ensured from a source of electricity production by involving a transformer coil receiving low-voltage current from the source and connected by a high-voltage cable to a mechanical distributor, generally of the rotating finger type, connected by high voltage cables to each of the engine spark plugs.

Une telle installation est connue, d'une part, pour être la source de fuites électriques dues, principalement, à la longueur des câbles haute tension et à la présence d'humidité et de dépôts de matières diverses favorisant le maintien de cette humidité et, d'autre part, pour émettre des parasites préjudiciables au bon fonctionnement d'installations radio-électriques.Such an installation is known, on the one hand, to be the source of electrical leaks due, mainly, to the length of the high-voltage cables and to the presence of humidity and deposits of various materials favoring the maintenance of this humidity and, on the other hand, to emit parasites harmful to the proper functioning of radio installations.

La perte d'énergie qui résulte de ces fuites doit être compensée en mettant en oeuvre des moyens capables de produire une haute tension plus élevée qui est responsable de plus de fuites encoreThe loss of energy resulting from these leaks must be compensated by using means capable of producing a higher high voltage which is responsible for more leaks still

Pour remédier à certains inconvénients connus des installations du type ci-dessus, il a été proposé de remplacer le distributeur de conception mécanique, par une distribution électronique. Si cette proposition a permis de supprimer les inconvénients dus au doigt tournant et aux contournements électriques entre plots fixes, en revanche, elle n'a pas permis de réduire la longueur des câbles haute tension entre les différents éléments de l'installation.To overcome certain known drawbacks of installations of the above type, it has been proposed to replace the mechanical design distributor with an electronic distribution. If this proposal made it possible to remove the drawbacks due to the rotating finger and the electrical bypassing between fixed studs, on the other hand, it did not allow reduce the length of high-voltage cables between the various elements of the installation.

Une autre proposition de la technique antérieure a été de placer une distribution électronique sur un câble basse tension menant à un groupe transformateur multisorties raccordées par des câbles haute tension aux différentes bougies.Another proposal of the prior art has been to place an electronic distribution on a low voltage cable leading to a multi-output transformer group connected by high voltage cables to the different plugs.

Une telle proposition a permis de supprimer la liaison haute tension entre la bobine et le distributeur, mais laisse subsister les câbles haute tension existant entre le groupe transformateur et les différentes bougies d'allumage.Such a proposal made it possible to remove the high voltage link between the coil and the distributor, but leaves the high voltage cables existing between the transformer group and the various spark plugs.

L'art antérieur connaît aussi une proposition visant à adapter, sur chaque bougie, un bloc bobine propre. Tel est le cas, notamment, des propositions selon les documents suivants DE-U-G 85 18 139.0, JP-A-57 193 776, JP-A-60 195 374, JP-A-51 137 041, JP-A-59 226 279, WO-A-86 04 480. The prior art also knows a proposal to adapt, on each candle, a clean coil block. This is the case, in particular, of the proposals according to the following documents DE-UG 85 18 139.0, JP-A-57 193 776, JP-A-60 195 374, JP-A-51 137 041, JP-A-59 226 279, WO-A-86 04 480.

Toutes les propositions formulées dans cette documentation ont ceci de commun qu'elles prévoient de disposer le bloc transformateur dans un corps prolongé par un embout, voire un manchon, qui est emboîté sur le fût en porcelaine d'une bougie. Un tel mode de construction a pour conséquence, la masse du bloc étant placée en tête, d'imposer, par les vibrations de fonctionnement du moteur, des contraintes alternées au fût qui n'est pas conçu pour résister mécaniquement à de tels efforts. Il en résulte une détérioration partielle ou totale de la bougie qui n'est plus en état d'assumer sa fonction.All the proposals made in this documentation have the common feature that they plan to place the transformer block in a body extended by a tip, or even a sleeve, which is fitted onto the porcelain barrel of a candle. The consequence of such a construction method, the mass of the block being placed at the head, is to impose, by the engine operating vibrations, alternating stresses on the barrel which is not designed to withstand such forces mechanically. This results in a partial or total deterioration of the candle which is no longer able to assume its function.

Toutes ces propositions ont aussi en commun de ne pas assurer convenablement un blindage de la bobine et de la bougie pour réduire, voire éliminer, l'émission de parasites radio-électriques. Ces propositions n'apparaissent pas non plus de nature à assurer une bonne étanchéité entre les interfaces de contact bobine-olive de bougie.All of these proposals also have in common the fact that they do not adequately shield the coil and the spark plug to reduce, or even eliminate, the emission of radioelectric interference. These proposals also do not appear likely to ensure a good seal between the coil-spark plug contact interfaces.

La présente invention a pour but de remédier aux inconvénients ci-dessus en proposant un bloc transformateur-allumage intégré, de construction particulièrement simple et fiable, prévu pour être associé, individuellement, à une bougie d'allumage de construction traditionnelle et ne nécessitant, pour son adaptation sur un moteur thermique existant, aucune modification structurelle fondamentalement importante.The present invention aims to remedy the above drawbacks by proposing an integrated transformer-ignition block, of particularly simple and reliable construction, designed to be associated, individually, with a spark plug. ignition of traditional construction and requiring, for its adaptation on an existing heat engine, no fundamentally important structural modification.

Pour atteindre les objectifs ci-dessus, le bloc transformateur-allumage intégré comprend les caractéristiques définies dans la revendication 1.To achieve the above objectives, the integrated transformer-ignition block comprises the characteristics defined in claim 1.

Diverses autres caractéristiques ressortent de la description faite ci-dessous en référence aux dessins annexés qui montrent, à titre d'exemples non limitatifs, des formes de réalisation de l'objet de l'invention.Various other characteristics will emerge from the description given below with reference to the appended drawings which show, by way of nonlimiting examples, embodiments of the subject of the invention.

La fig. 1 est une vue schématique illustrant l'objectif que l'invention permet d'atteindre. Fig. 1 is a schematic view illustrating the objective that the invention achieves.

La fig. 2 est une coupe-élévation en partie arrachée de l'objet de l'invention. Fig. 2 is a partially cutaway elevation view of the subject of the invention.

La fig. 3 est une vue du schéma électrique d'un des éléments constitutifs de l'objet de l'invention. Fig. 3 is a view of the electrical diagram of one of the constituent elements of the subject of the invention.

La fig. 1 montre, de façon schématique, une installation d'allumage d'un moteur thermique 1 du type à explosion et à allumage commandé. Le moteur 1 est illustré, à titre d'exemple, sous la forme d'un ensemble comportant quatre cylindres 2 devant être commandés en allumage, de façon sélective, selon un ordre prédéterminé. Il est évident que l'invention peut s'appliquer à tout moteur comportant un nombre différent de cylindres 2. Fig. 1 shows, diagrammatically, an installation for ignition of an internal combustion engine 1 of the explosion-ignition type. The engine 1 is illustrated, by way of example, in the form of an assembly comprising four cylinders 2 which must be selectively controlled by ignition, in a predetermined order. It is obvious that the invention can be applied to any engine comprising a different number of cylinders 2 .

Une installation d'allumage 3 d'un tel moteur 1, comprend une source d'énergie électrique 4 reliée par un câble basse tension 5 à un moyen de distribution 6 associé à un bloc de commande 6a et lui-même relié par des câbles basse tension 7 à chacune des bougies d'allumage 8 montées sur la culasse 9 du moteur 1.An ignition installation 3 of such an engine 1 comprises an electrical energy source 4 connected by a low voltage cable 5 to a distribution means 6 associated with a block of control 6 a and itself connected by low voltage cables 7 to each of the spark plugs 8 mounted on the cylinder head 9 of the engine 1 .

L'invention préconise d'associer chaque bougie 8 à un bloc 10 transformateur-allumage intégré illustré plus en détail à la fig. 2. Selon cette figure, chaque bloc 10 comprend un corps tubulaire 11, en toute matière appropriée, notamment métallique ou en matière plastique conductrice chargée, afin de constituer un blindage électromagnétique. Le corps 11 délimite, de part et d'autre d'un épaulement annulaire 12, un taraudage 13 et un logement 14, de préférence coaxiaux, s'ouvrant, respectivement, à chacune des extrémités du corps tubulaire 11. Le corps 11 peut être réalisé en une seule pièce ou en deux parties assemblables de façon étanche.The invention recommends associating each spark plug 8 with an integrated transformer-ignition block 10 illustrated in more detail in FIG. 2 . According to this figure, each block 10 comprises a tubular body 11 , in any suitable material, in particular metallic or in charged conductive plastic, in order to constitute an electromagnetic shielding. The body 11 defines, on either side of an annular shoulder 12 , a thread 13 and a housing 14 , preferably coaxial, opening, respectively, at each of the ends of the tubular body 11 . The body 11 can be produced in a single piece or in two parts which can be assembled in a sealed manner.

Le taraudage 13 est destiné au montage du corps 11 sur une bougie d'allumage 15 comprenant un fût 16 relié par une embase 17 à une collerette 18 à partir de laquelle s'étend un culot 19 pourvu d'électrodes 20 et 21. La bougie 15 comporte, à cette fin, sur l'embase 17, un filetage 22 complémentaire au taraudage 13 qui présente une longueur axiale légèrement inférieure à la hauteur de l'embase 17. Le montage étanche, entre le taraudage 13 et l'embase 17, est assuré par un joint d'étanchéité 23 soumis à écrasement entre l'extrémité transversale ouverte du corps tubulaire 11 et la collerette 18. La relation de longueur axiale, entre le taraudage 13 et le filetage 17, est également déterminée de manière à faire intervenir, après écrasement partiel du joint 23, une butée positive de l'embase 17 contre l'épaulement 12.The internal thread 13 is intended for mounting the body 11 on a spark plug 15 comprising a barrel 16 connected by a base 17 to a flange 18 from which extends a base 19 provided with electrodes 20 and 21 . The spark plug 15 comprises, for this purpose, on the base 17 , a thread 22 complementary to the internal thread 13 which has an axial length slightly less than the height of the base 17 . The sealed assembly, between the internal thread 13 and the base 17 , is ensured by a seal 23 subjected to crushing between the open transverse end of the tubular body 11 and the flange 18 . The axial length relationship between the internal thread 13 and the thread 17 is also determined so as to involve, after partial crushing of the seal 23 , a positive abutment of the base 17 against the shoulder 12 .

Le logement 14 contient une bobine transformatrice 24 noyée dans un enrobage diélectrique 25 assurant son centrage dans le logement 14, ainsi que son immobilisaton axiale. A cette fin, l'enrobage 25 peut former un collet 26 immobilisé axialement en appui contre un épaulement 27 du logement 14, par un bouchon de fermeture 28.The housing 14 contains a transformer coil 24 embedded in a dielectric coating 25 ensuring its centering in the housing 14 , as well as its axial immobilaton. To this end, the coating 25 can form a collar 26 immobilized axially in abutment against a shoulder 27 of the housing 14 , by a closure plug 28 .

La bobine transformatrice 24 traverse le corps tubulaire 11 par un connecteur 29 conçu de toute manière convenable pour permettre le branchement mécaniquement et électriquement efficace avec un câble de raccordement basse tension 7. Le connecteur 29 comporte trois bornes de raccordement dont deux sont raccordées à un enroulement primaire E₁ (fig. 3) et dont l'autre est raccordée à un enroulement secondaire E₂ relié à une borne de contact 30 placée intérieurement au corps 11. La borne 30 est entourée par un embout 31 d'adaptation d'un manchon 32 en matière diélectrique, disposé dans le logement 14 entre la bobine 24 et l'épaulement 12. Le manchon 32 délimite axialement un alésage 33 permettant l'emboîtement serré du fût 16 d'une bougie d'allumage 15. Pour assumer cette fonction, le manchon 32 est, de préférence, conçu et réalisé en un élastomère capable d'accepter une déformation élastique, notamment selon une direction radiale, à partir de l'alésage 33.The transformer coil 24 passes through the tubular body 11 by a connector 29 designed in any way suitable for allow mechanical and electrically efficient connection with a low voltage connection cable 7 . The connector 29 has three connection terminals, two of which are connected to a primary winding E₁ ( FIG. 3 ) and the other of which is connected to a secondary winding E₂ connected to a contact terminal 30 placed inside the body 11 . The terminal 30 is surrounded by an end piece 31 for adapting a sleeve 32 of dielectric material, placed in the housing 14 between the coil 24 and the shoulder 12 . The sleeve 32 axially delimits a bore 33 allowing the tight fitting of the barrel 16 of a spark plug 15 . To assume this function, the sleeve 32 is preferably designed and produced from an elastomer capable of accepting an elastic deformation, in particular in a radial direction, from the bore 33 .

L'embout d'adaptation 31 est réalisé pour permettre un montage par encliquetage du manchon 32 autour de la borne 30 qui est, de préférence, constituée par un plot 34 rétractable élastiquement et destiné à coopérer avec une olive 35 équipant ordinairement l'extrémité supérieure du fût 16.The adapter 31 is made to allow snap fitting of the sleeve 32 around the terminal 30 which is preferably constituted by an elastically retractable stud 34 and intended to cooperate with an olive 35 usually fitted to the upper end cask 16 .

Le montage du corps tubulaire 11 sur une bougie 15 permet de réaliser un bloc unitaire dans lequel l'olive 35 est en contact permanent avec le plot 34 de la bobine 24. Dans un tel montage, les surfaces de contact, entre le plot 34 et l'olive 35, sont confinées à l'intérieur de l'alésage 33 qui est isolé du milieu ambiant par le bouchon de fermeture supérieure 28 et par la présence du joint d'étanchéité 23 et par le serrage du manchon 32 sur le fût 16. Ceci supprime tout risque d'introduction de corps étranger et d'humidité susceptibles de nuire à un bon contact électrique. Par ailleurs, ces surfaces sont entourées par la masse du manchon 32 qui représente un isolant électrique, évitant toute fuite du courant haute tension et augmentant la résistance au cheminement entre le plot 34 et l'embase 17, d'une part, et le corps 11, d'autre part. A cette fin, le corps tubulaire 11 est, de préférence, réalisé de manière à présenter un logement 14 de diamètre, notablement, plus important que celui du taraudage 13, de manière à admettre un manchon 32 de forte épaisseur radiale.The mounting of the tubular body 11 on a spark plug 15 makes it possible to produce a unitary block in which the olive 35 is in permanent contact with the stud 34 of the coil 24 . In such an assembly, the contact surfaces, between the stud 34 and the olive 35 , are confined inside the bore 33 which is isolated from the ambient environment by the upper closure plug 28 and by the presence of the seal. seal 23 and by tightening the sleeve 32 on the barrel 16 . This eliminates any risk of the introduction of foreign bodies and moisture which could interfere with good electrical contact. Furthermore, these surfaces are surrounded by the mass of the sleeve 32 which represents an electrical insulator, preventing any leakage of the high voltage current and increasing the resistance to the path between the stud 34 and the base 17 , on the one hand, and the body 11 , on the other hand. To this end, the tubular body 11 is preferably made so as to present a housing 14 of diameter, notably, larger than that of the internal thread 13 , so as to admit a sleeve 32 of large radial thickness.

Le bloc 10 selon l'invention permet de réaliser un ensemble unitaire intégrant la fonction de transformation du courant d'alimentation basse tension en haute tension et la fonction d'allumage à l'intérieur d'un cylindre. La transmission d'un courant haute tension s'effectue directement entre le plot de contact 34 et l'olive 35 et permet, ainsi, de supprimer tout câble et embouts de raccordement susceptibles d'être la source de fuite, de claquage, de perte d'énergie et de perte de continuité diélectrique.The block 10 according to the invention makes it possible to produce a unitary assembly integrating the function of transforming the low voltage supply current into high voltage and the ignition function inside a cylinder. The transmission of a high voltage current takes place directly between the contact pad 34 and the olive 35 and thus makes it possible to remove any cable and connection end pieces liable to be the source of leakage, breakdown, loss. of energy and loss of dielectric continuity.

Le bloc transformateur-allumage intégré selon l'invention peut être réalisé de façon pratique et efficace en étant soumis, en usine, aux différents contrôles de fonctionnement et d'étanchéité. Un tel bloc peut, ainsi, être adapté directement sur une bougie d'allumage sans faire intervenir d'autres opérations que le vissage de cette dernière dans le taraudage 13, après interposition du joint d'étanchéité 23. Le couple de serrage appliqué peut être justement apprécié, entre des outils de serrage respectivement adaptés sur l'embase 18 et sur une tête 36, par exemple, à six pans.The integrated transformer-ignition block according to the invention can be produced in a practical and efficient manner by being subjected, in the factory, to the various functional and leakage checks. Such a block can thus be adapted directly to a spark plug without involving any operations other than screwing the latter into the thread 13 , after interposition of the seal 23 . The applied tightening torque can be precisely appreciated, between respectively adapted tightening tools on the base 18 and on a head 36 , for example, with a hexagon.

L'objet de l'invention peut, ainsi, être monté sous une forme unitaire préalablement à l'adaptation de la bougie 15 sur le cylindre ou encore, être constitué après l'adaptation traditionnelle de cette bougie sur le cylindre.The object of the invention can thus be mounted in a unitary form prior to the adaptation of the spark plug 15 on the cylinder or even be formed after the traditional adaptation of this candle on the cylinder.

Il doit être considéré que la fonction du taraudage 13 est de réaliser l'adaptation du corps 11 sur une bougie 15 sans transmission de contrainte au fût 16. Un moyen d'assemblage autre pourrait aussi être prévu à cette fin. Par exemple, un assemblage du type à coincement par cônes conjugués pourrait aussi être envisagé.It must be considered that the function of the tapping 13 is to carry out the adaptation of the body 11 on a spark plug 15 without transmission of stress to the barrel 16 . Another assembly means could also be provided for this purpose. For example, an assembly of the type with wedging by conjugated cones could also be envisaged.

Le bloc selon l'invention peut être adapté sur tout type de bougie d'allumage montée sur des culasses traditionnelles ou délimitant des puits d'implantation profonds. Dans un tel cas, le corps tubulaire 11 est alors, de préférence, associé à une bague 37 en élastomère apte à assurer une fonction de centrage et de guidage du corps tubulaire 11, ainsi qu'une fonction de fermeture s'opposant à l'introduction de tout corps étranger dans le puits. La bague 37 peut aussi avoir pour fonction de limiter les contraintes mécaniques susceptibles d'être transmises à l'embase 17 par les vibrations de fonctionnement appliquées à la masse que représente le bloc transformateur-allumage intégré.The block according to the invention can be adapted to any type of spark plug mounted on traditional cylinder heads or delimiting deep implantation wells. In such a case, the tubular body 11 is then preferably associated with an elastomer ring 37 capable of ensuring a centering and guiding the tubular body 11 , as well as a closing function opposing the introduction of any foreign body into the well. The ring 37 can also have the function of limiting the mechanical stresses liable to be transmitted to the base 17 by the operating vibrations applied to the mass represented by the integrated transformer-ignition block.

Selon une disposition préférée de l'objet de l'invention, le corps 11 délimite un logement 14 et un taraudage 13 coaxiaux et contient une bobine 24 et un manchon 32 également coaxiaux. Le manchon 32 pourrait faire partie intégrante de l'enrobage 25 de la bobine 24.According to a preferred arrangement of the object of the invention, the body 11 delimits a housing 14 and a coaxial thread 13 and contains a coil 24 and a sleeve 32 also coaxial. The sleeve 32 could be an integral part of the coating 25 of the coil 24 .

La constitution sous forme intégrée d'un bloc transformateur-allumage présente, par rapport à la technique antérieure, les avantages de réduire les pertes entre la bobine et la bougie, d'assurer une meilleure étanchéité facilitant les démarrages à froid et de diminuer très notablement l'émission de parasites radio-électriques, plus particulièrement, si le corps 11 est réalisé en un matériau métallique magnétique constituant un blindage de la bobine et de la bougie.The constitution in integrated form of a transformer-ignition block has, compared to the prior art, the advantages of reducing losses between the coil and the spark plug, of ensuring a better seal facilitating cold starts and of decreasing very notably the emission of radio interference, more particularly, if the body 11 is made of a magnetic metallic material constituting a shielding of the coil and of the spark plug.

En outre, une telle construction offre une possibilité de protection thermique de la bobine, ainsi qu'une aptitude à réaliser une commande électronique à distance.In addition, such a construction offers a possibility of thermal protection of the coil, as well as an ability to carry out electronic remote control.

Cette construction peut aussi être envisagée pour des systèmes d'allumage de type selfique ou capacitif.This construction can also be envisaged for ignition systems of the inductive or capacitive type.

L'invention n'est pas limitée aux exemples décrits et représentés, car diverses modifications peuvent y être apportées sans sortir de son cadre. En particulier, le corps 11 pourrait être réalisé en deux parties constitutives assemblées, notamment par vissage.The invention is not limited to the examples described and shown, since various modifications can be made thereto without departing from its scope. In particular, the body 11 could be produced in two component parts assembled, in particular by screwing.

Claims (9)

  1. Integrated ignition-transformer assembly for the cylinder of a heat engine having controlled ignition, the assembly being of the type comprising a tubular body (11) delimiting, an internal shoulder (12), mounting means (13) on one side of said shoulder for mounting on the stem of a spark plug (15) and a housing (14) on the other side of said shoulder (15) containing an axially fixed transformer coil which is encapsulated in a dielectric coating and which includes a terminal for making contact with the spark plug;
       characterized in that:
       the means (13) is constituted by disconnectable fixing means for cooperating with the base (17) of an adapted spark plug,
       and said tubular body (11) contains an internal sleeve (32) of dielectric material which extends the transformer coil to the shoulder (12), defining a bore (33) intended to receive, in sealed manner, the stem (16) of the spark plug and in which projects the terminal (30).
  2. Assembly according to claim 1, characterized in that the means (13) and the housing (14) are coaxial on either side of the internal shoulder (12) which constitutes an axial abutment for cooperating with the threaded base of a spark plug.
  3. Assembly according to claim 1, characterized in that the transformer coil (24) and the sleeve (32) constitute an assembly which is put into place inside the tubular body (11) via an open end situated at the opposite end to the means (13) and closed by a sealed stopper (28), thereby axially fixing the coil and providing sealing for the assembly.
  4. Assembly according to claim 3, characterized in that the dielectric coating (25) of the coil and the sleeve (32) in said coil and sleeve assembly (24, 32) are constituted as a single piece.
  5. Assembly according to claim 3, characterized in that the coil and sleeve assembly (24, 32) is made in two pieces, and in that the sleeve (32) is immobilized in abutment against the shoulder (12).
  6. Assembly according to claim 1, 3, 4 or 5, characterized in that in order to make contact with the spark plug, the coil (24) includes a contact terminal (30) which is encapsulated in the dielectric coating (25) which constitutes an end fitting (31) for adapting the sleeve (32).
  7. Assembly according to claim 6, characterized in that the terminal (30) is constituted by a stud (34) which is at least in part resiliently retractable.
  8. Assembly according to claim 1, characterized in that the tubular body (11) is associated with a ring (37) for closing and centering a well in a cylinder head in which the body is mounted.
  9. Assembly according to claims 1 and 3, characterized in that the tubular body (11) and said stopper (28) are made of a material suitable for providing electromagnetic screening.
EP19880420174 1987-04-08 1988-05-31 Ignition unit comprising a combined spark plug and transformer for a cylinder of a thermal engine with spark ignition Expired - Lifetime EP0344387B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR8705238A FR2613779B1 (en) 1987-04-08 1987-04-08 INTEGRATED IGNITION-TRANSFORMER BLOCK FOR CONTROLLED IGNITION ENGINE CYLINDER
ES88420174T ES2067484T3 (en) 1988-05-31 1988-05-31 TRANSFORMER BLOCK WITH INTEGRATED IGNITION FOR REGULAR IGNITION THERMAL ENGINE CYLINDER.
EP19880420174 EP0344387B1 (en) 1988-05-31 1988-05-31 Ignition unit comprising a combined spark plug and transformer for a cylinder of a thermal engine with spark ignition
DE19883852300 DE3852300T2 (en) 1988-05-31 1988-05-31 Ignition transformer and spark plug unit in a cylinder in a controlled internal combustion engine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19880420174 EP0344387B1 (en) 1988-05-31 1988-05-31 Ignition unit comprising a combined spark plug and transformer for a cylinder of a thermal engine with spark ignition

Publications (2)

Publication Number Publication Date
EP0344387A1 EP0344387A1 (en) 1989-12-06
EP0344387B1 true EP0344387B1 (en) 1994-11-30

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EP19880420174 Expired - Lifetime EP0344387B1 (en) 1987-04-08 1988-05-31 Ignition unit comprising a combined spark plug and transformer for a cylinder of a thermal engine with spark ignition

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EP (1) EP0344387B1 (en)
DE (1) DE3852300T2 (en)
ES (1) ES2067484T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4903674A (en) * 1989-03-13 1990-02-27 General Motors Corporation Spark developing apparatus for internal combustion engines
FR2661216B1 (en) * 1990-04-23 1992-08-14 Electricfil Ind Sarl INTEGRATED INDIVIDUAL IGNITION COIL OF AN INTERNAL COMBUSTION AND CONTROLLED IGNITION THERMAL ENGINE SPARK PLUG.
DE4102145A1 (en) * 1991-01-25 1992-07-30 Bosch Gmbh Robert FASTENING ARRANGEMENT FOR CONNECTIONS TO IGNITION COILS FOR MOTOR VEHICLES
DE4442634B4 (en) * 1994-11-30 2007-08-30 Bayerische Motoren Werke Ag Device for fastening a Einzelspulenzündsystems with the cylinder head of an internal combustion engine
EP0964413B1 (en) * 1996-08-31 2003-03-26 Toyo Denso Kabushiki Kaisha Engine igniting coil device
DE69705178T2 (en) * 1996-08-31 2001-09-20 Toyo Denso K.K., Tokio/Tokyo Ignition coil device for internal combustion engines
JP7238530B2 (en) 2019-03-26 2023-03-14 株式会社デンソー ignition coil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467725A (en) * 1947-08-28 1949-04-19 Westinghouse Electric Corp Ignition system
US2632132A (en) * 1951-06-15 1953-03-17 Delano James Kendall Spark plug
US3940649A (en) * 1974-07-09 1976-02-24 Berstler Francis E Spark plug construction
FR2599431B1 (en) * 1986-06-03 1988-09-09 Renault Sport ELECTROMAGNETIC COIL AND IGNITION DEVICE FOR AN INTERNAL COMBUSTION ENGINE COMPRISING SUCH A COIL.

Also Published As

Publication number Publication date
ES2067484T3 (en) 1995-04-01
EP0344387A1 (en) 1989-12-06
DE3852300T2 (en) 1995-04-06
DE3852300D1 (en) 1995-01-12

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