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EP2929249A1 - Diesel engine heater plug - Google Patents

Diesel engine heater plug

Info

Publication number
EP2929249A1
EP2929249A1 EP13802571.3A EP13802571A EP2929249A1 EP 2929249 A1 EP2929249 A1 EP 2929249A1 EP 13802571 A EP13802571 A EP 13802571A EP 2929249 A1 EP2929249 A1 EP 2929249A1
Authority
EP
European Patent Office
Prior art keywords
electrode
glow plug
tubular body
heating
connection wire
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.)
Withdrawn
Application number
EP13802571.3A
Other languages
German (de)
French (fr)
Inventor
Jean-Marc Couffignal
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2929249A1 publication Critical patent/EP2929249A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F23Q2007/004—Manufacturing or assembling methods

Definitions

  • the present invention relates to a glow plug of a diesel engine with a ceramic heating rod comprising:
  • a metal tubular body one end of which is terminated by a ceramic heating rod and the other end carrying a connection tip,
  • the heating rod housing the heating conductor integrated in the ceramic of a heating cartridge
  • An electrode traversing the tubular body in isolation and electrically connecting the heating filament of the heating cartridge and the connection endpiece itself held in isolation in the end of the tubular body.
  • the glow plug consists of a metal tubular body whose one end is the heating rod and the other is provided with a connection tip. Near this end, the metal body has an external thread for screwing into the cylinder head of the engine and at the other end, a cone to thereby position the heating rod in the combustion chamber.
  • the candle has a central electrode in the form of a metal rod passing through the tubular body.
  • This rod is connected at one end to the connection end and by its other threaded end it is connected, by screwing, to the end of the electrical connection wire wound helically.
  • the electrical connection wire is secured to the ceramic through a solder.
  • This solder also provides power to one end of the metal filament embedded in the heating ceramic.
  • the other end of the metal filament is connected, by a second solder, to the protective metal tube of the heating rod for electrical return to ground. All the components are held in position by an insulating powder compacted in the protective tube.
  • the object of the present invention is to provide a ceramic heater preheating candle, of simple design, which makes it possible to effectively withstand the stresses of expansion and retraction under the effect of the large variations in temperatures to which the candle is subjected while simplifying the structure and realization of the glow plug and thus reducing its cost.
  • the subject of the invention is a glow plug of the type defined above, characterized in that the conductive feed path of the heating cartridge comprises:
  • connection wire connected to the electrode by an integral connection blocking the rear end of the connection wire at the front end of the electrode
  • connection wire having an intermediate segment between its front segment fixed to the heating cartridge and its rear segment fixed to the front end of the electrode, this intermediate segment being in excess of the length between the fixing point of the connecting wire to the heating cartridge and to the electrode, in the rest position, to have a developed length greater than the elongation of the length in the operating state of the glow plug, setting operating temperature.
  • the embodiment of glow plug according to the invention greatly simplifies the machining and assembly through the removal of insulating powder and its compaction.
  • the assembly is done by simple operations, such as placing the components by fitting, laser welding, deformation of the material for crimping and other simple operations.
  • the components are also obtained by simple and usual methods: the connecting wire is made by a simple wire drawing process, the centering member is manufactured for example by press molding of composite and the electrode is made by bar turning.
  • the simplification of the assembly avoids difficulties and reduces the cost of production.
  • the blocking member of the electrode relative to the tubular body comprises:
  • a gripping surface constituted by a local deformation of the surface of the electrode
  • a crimping of the tubular body compressing the sleeve in the local deformation of the attachment surface of the electrode to mechanically secure the crimping point of the tubular body to the gripping surface of the electrode.
  • the attachment surface is constituted by a knurling.
  • the blocking member thus produced by the attachment surface of the insulating cap and the crimping of the tubular body, secures the crimping point of the electrode to the crimping point of the tubular body which thus remains integral during the elongation movements and shrinkage related to temperature variations or shaking and vibration induced in the glow plug. Under these conditions, the excess length segment can play its role of compensating for the elongations between the heating cartridge and the electrode.
  • the segment in excess of the connection wire has a shape chosen from the group comprising:
  • the centering member is a cylindrical piece, of revolution, traversed by an axial bore for the passage of the rear end of the connection wire and a rear cavity receiving, without radial play, the front end. electrode, and
  • the opening of the heating rod casing comprises a counterbore for receiving in abutment the centering member.
  • connection wire is connected to the front end of the electrode by welding or crimping.
  • the rear end of the connecting wire is thus secured to the electrode so that the variable distance compensated by the segment in excess is that of the relative movement of the fasteners of the ends of the connection wire on the one hand to the heating cartridge and d the other hand to the electrode.
  • the end of the electrode comprises an axial housing receiving the end of the connection wire locked in the axial housing by a weld through the wall of the end or by crimping the end on the back end of the lead wire.
  • connection between the connection wire and the electrode is of one embodiment is a particularly simple implementation.
  • the rear end of the electrode is knurled and the connection end has a cylindrical housing receiving the end of the electrode to be crimped on the knurling.
  • the invention also relates to a method for producing a glow plug as defined above, characterized in that
  • connection wire is assembled to the heating cartridge by brazing and the cartridge is installed in the casing by fixing it by a solder also ensuring the electrical contact between the heating filament and the metal casing,
  • the centering element is placed in the base of the metal casing by threading the rear end of the connection wire into the hole in the centering member,
  • the electrode is assembled at the rear end of the connection wire
  • the sleeve is placed on the knurling of the electrode and the tubular body is put in place by fixing it to the thick base by means of a weld, and then the electrode is locked by crimping on the knurling of the electrode. with interposition of the insulating sleeve,
  • FIG. 1 is an axial section of the glow plug
  • FIG. 2 is a detailed view of the conductive feed path of the heating element
  • FIG. 3A is a detailed view of the connection wire according to a first embodiment
  • FIG. 3B is a detail view of the connection wire according to a second embodiment
  • FIG. 4A is a schematic view of a connection wire and the end of the electrode to which it is connected according to a first embodiment
  • FIG. 4B shows another connection variant of the connection wire and the electrode, to which it is connected according to a second embodiment
  • FIG. 5 is a sectional view showing the insulating assembly of the front end of the electrode in the centering element itself attached to the rear end of the heating rod in the metal casing
  • FIG. 6 is a sectional view showing the crimping of the intermediate zone of the electrode in the body of the glow plug
  • FIG. 7 is a detail sectional view of the assembly of the connecting piece and the insulating sleeve to the tubular body.
  • the glow plug consists of a tubular body 1 connected at one end 1 1 to a ceramic heating rod 2, the other end 12 being connected to a connecting piece 3.
  • the cone 26 of the glow plug ensures the centering and sealing support in the cylinder head.
  • the spark plug is locked in position by screwing the thread 13 into the cylinder head of the engine, and by passing the heating cartridge 22 relative to the cone 26, the heating rod 2 protrudes into the combustion chamber to preheat.
  • the connector 3 is connected to the electrical circuit board (not shown) by the preheating control itself not shown.
  • the heating pencil 2 operates as a heating resistor connected on one side to the ground by the support of the cone 26 in the cylinder head and by its metal shell, itself electrically connected to the body 1 which is also grounded by its screwing 13 in the breech.
  • the other end of the heating rod 2 is connected to the electrical circuit board by the conductive path "+" through the connection wire 4, the electrode 5 passing through the body 1 and connected to the connection tip 3.
  • the heating pencil 2 consists of a metal shell 21 in the form of a finger housing a heating cartridge 22 made of ceramic incorporating a heating conductor Joule effect.
  • the heating cartridge 22 is connected to the front end 41 of a connection wire 4 having an intermediate segment 42 and a rear end 43 fixed to the front end 51 of an electrode 5 housed in the tubular body 1.
  • the electrode 5 is a metal rod of circular section occupying the entire length of the tubular body 1 and having a front end 51 provided with a housing 52 such as an axial bore for receiving and fixing the rear end 43 of the connection wire 4.
  • the electrode 5 has a knurling 53 in the intermediate position and it ends with an end 54 also provided with a knurling to receive the connecting piece 3.
  • the centering member 6 is a piece of refractory insulating material, of cylindrical shape traversed by a bore 61 and provided at the rear with a housing 62 so as to allow the passage and the centered holding of the rear end. 43 of the connection wire 4 and receive in its housing 62 the front end 51 of the electrode 5.
  • the centering member 6 maintains the end of the electrode 5 without radial play.
  • the centering member 6 is itself housed in part, without radial play, in the countersink 25 of the metal casing 24 of the heating rod 2.
  • the centering member 6 is for example made of composite DURATON 700PI (trademark ) of the firm QUADRANT.
  • the electrode 5 is locked in position in the tubular body 1 by means of the insulating sleeve 7 compressed on and in the knurling 53 by the crimping deformation 14 of the tubular body 1. The electrode 5 is thus immobilized in translation and in translation. rotation relative to the tubular body 1.
  • the knurling 53 is generally an example of a hooking surface produced by a local deformation of the surface of the electrode 5 to allow the insulating sleeve 7 to catch on.
  • the rear end 54 of the electrode 5 is knurled to receive the connector 3 which consists of a sleeve 31 followed by a flange 32 and a pin or connection tab 33.
  • the tip 3 is attached to the electrode 5 by its crimping 34 on the knurling of the end 54.
  • the connecting piece 3 is electrically isolated in the rear end 12 of the tubular body 1 with the interposition of an insulating sleeve 8.
  • the tubular body 1 is externally provided with a thread 13 for its screwing into the heat engine, its rear end 12 comprising a tool socket 15, for example in the form of a hexagon nut for screwing / unscrewing the candle. preheating in the engine.
  • the tubular body 1 is welded to the metal casing 24 of the heating rod 2 by the weld 16.
  • the segment 42 of the connection wire 4 is a segment in excess of length relative to two reference points of the glow plug, for example the length (L) taken between the solder 55 in the electrode 5 which secures the wire 43 and the the rear end of the cartridge 22, this Ion- Since this is the measurement of this interval when the candle is at rest at ambient temperature, while in operation the distance between these two reference points increases sharply.
  • the segment in excess of length 42 has a developed length or more precisely an excess length, much greater than the increase in length (L) under the effect of the expansion resulting from the temperature rise of the glow plug in operation, of so as not to induce tensile force at the solder assembly between the back of the ceramic 22 and the end of the connecting wire 41.
  • This excess length is easily calculated from the geometric data of the glow plug and coefficients of thermal expansion of the materials constituting the glow plug.
  • This longer segment 42 provides the same protection function when the candle is subjected to strong retractions due to cold weather when the engine stops.
  • the segment in excess length 42 provides both the damping of the expansions / retractions which correspond to large variations in the axial length of the various components of the candle, due to the movements of expansion and retraction of these components that surround and maintain in position the elements of the internal circuit of the spark plug, that is to say, the connection between the end of the heating element and the connection plug.
  • These very strong expansions and retractions are due to variations in the extreme temperatures that the glow plug experiences during cold start and continuous engine operation.
  • the segment in excess length 42 makes it possible to collect not only the axial length variations but also the radial stresses due to misalignment between the heating rod 2, the connection wire 4, the centering member 6 and the electrode 5.
  • the segment in excess of length 42 also makes it possible to absorb the vibrations induced in the glow plug by the operation of the engine.
  • the length of the segment 42 is practically achieved by a two or three-dimensional shape in S, Z or in one or more turns or windings but with a substantially reduced overall contour with respect to the free section of the chamber 23 to avoid any electrical contact which would result from expansion or deformation due to changes in temperature or mechanical effects such as shocks or vibrations generated during operation of the equipment (vehicle) having such a glow plug.
  • the front end 51 of the electrode 5 bears axially at the bottom of the housing 62 of the centering member 6 itself in axial support at the bottom of the countersink 25 of the metal casing 21. The holding in position or immobilization of the electrode 5 is not ensured by its connection with the connection wire 4 whose only function is to provide the electrical connection.
  • the insulating sleeve 7 is made of an insulating PA66 composite material that is resistant to high pressures.
  • the sleeve 7 is fitted and held on the electrode 5 before the introduction of the tubular body 1 to be subsequently compressed by the deformation 14 of the tubular body 1.
  • the material of the sleeve 7 s In this way, the electrode 5 is immobilized in the motor zone 53 to immobilize the electrode 5 in this way.
  • This immobilization of the electrode 5 guarantees two essential functions of the glow plug, namely the absence of movement of the connection wire 4 other than the extension / retraction of its segment in excess length, and the fixing of the connector 3.
  • Figure 2 shows the conductive feed path of the heating rod 2, composed of the connecting wire 4 connected to the heating cartridge 22, the electrode 5 connected to the connection wire and the knurled end 12 of the electrode.
  • the centering member 6 is engaged on the connection wire 4 since the rear end 43 of the connection wire 4 is already soldered by the solder 55 to the front end 51 of the electrode 5.
  • the insulating sleeve 7 may also be already installed on the hooking surface or knurled area 53. On the other hand, the endpiece 3 is not installed since it is necessary to set up the tubular body 1 first.
  • connection between the connection wire 4 and the electrode 5 is a solder 55, the other variant of the crimp shown in Fig.4B.
  • FIGS 3A, 3B show the detail of an example of connection wire 4 shown alone.
  • the front ends 41 and rear 43 are identical and only differs the shape of the segments in excess length 42.
  • the front end 41 of the connection son 4 has a hollow cone shape schematized here by a "V" to be attached to the back of the heater cartridge 22 ceramic solder.
  • connection wire 4A has an over-long segment 42A with a rounded Z-shape. It may be a turn in a plane or a three-dimensional turn.
  • the front end 41 is hollow cone to facilitate its perfect centering and solder attachment to the rear end of the heating cartridge 22 which is also conical.
  • the extended segment 42B of the lead wire 4B in FIG. 3B has a W-shape which provides it with a large excess length.
  • the front end 41 is hollow cone to facilitate its perfect centering and solder attachment to the rear end of the heating cartridge 22 which is also conical.
  • FIG. 4A shows the connection wire 4A and its connection to the front end 51 of the electrode 5.
  • the rear end 43 is placed in the housing 52 of the end 51 of the electrode 5, being blocked there by a spot welding 55, through the thickness of this end 51. This welding is performed by laser.
  • FIG. 4B shows another assembly variant of the connection wire 4A at the front end 51 of the electrode 5.
  • the end 43 is placed in the housing 52 before being blocked by the crimping 56.
  • FIG. 5 shows a detailed detail view of the rear end of the casing 22 with its base 24 and its countersink 25 receiving the centering member 6 which itself receives the front end 51 of the elec- Figure 5 shows only the assembly of these three parts without the connection wire 4 which normally first passes through the bore 61 of the centering member 6 to be then attached to the front end 51 of the electrode 5.
  • FIG. 6 is a partial detail view of the zone of crimping or crimping 14 of the body 1 on the insulating sleeve 7 itself attached to the knurling 53 of the electrode 5 to block it.
  • FIG. 7 is a partial detail view of the zone of placement of the outer surface 81 of the insulating sleeve 8 in the diameter of the counterbore 17 of the tubular body 1.
  • the insulating sleeve 8 is abutted at the bottom of this counterbore 17 of the body 1.
  • the sleeve 31 of the connecting piece 3 is placed in the inner surface 82 of the insulation sleeve 8 by force-fitting to the press. This placing in force has the effect of creating a high pressure between the sleeve 31 of the connecting piece 3 and the inner surface 82 of the insulating sleeve 8 which in turn exerts pressure on the diameter of the countersink 17 of the tubular body 1 through the outer surface 81.
  • the connection tip 3, the insulation sleeve 8 and the tubular body 1 are perfectly sealed.
  • the mounting of the glow plug according to the invention is done simply after having made the various components:
  • connection wire 4 is assembled to the heating cartridge 22 by soldering, the cartridge being itself installed in the envelope 21 by a second solder. Then, simultaneously, the centering member 6 is engaged in the countersink 25 and the rear end 43 in the bore 61. Then, the electrode 5 is assembled at the rear end 43 by welding or crimping the end 51 on the rear end 43 to secure the connection.
  • the sleeve 7 is preferably placed tightly on the knurling 53 before the introduction of the tubular body 1, so as to remain in the right place on the electrode 5.
  • the next step is the positioning of the tubular body 1 relative to the thick base 24 of the heating cartridge 2 to carry out the final assembly by the weld 16 and then block the electrode 5 by the crimping 14 of the tubular body 1 on the knurling 53 with interposition of the insulating sleeve 7.
  • the penultimate step is to install the insulating sleeve 8 by contact of the outer surface 81 in the diameter of the countersink 17 of the zone 12 of the tubular body 1.
  • the last step consists in force-fitting the sleeve 31 of the connecting piece 3 into the rear end 12 of the tubular body 1 with interposition of the insulating sleeve 8 and securing the tip / electrode assembly by crimping 34.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Spark Plugs (AREA)

Abstract

Heater plug comprising a tubular body (1) of which one end (11) ends in a ceramic heating rod (2) and the other end (12) bears a connection end fitting (3). The heater cartridge (22) is connected to the electrode (5) passing through the tubular body (1) by a connecting wire (4) that has an intermediate segment (42) that is overly long between the points of attachment of the connecting wire to the heating cartridge (22) and to the electrode (5). A centering member (6) positions the connecting wire and the electrode in the body (1). The electrode (5) is also crimped into the body (1) by the crimping point (14) via an insulating sleeve (7) on the knurled surface (53). The connection end fitting (3) is also insulated from the body (1) by the sleeve (8).

Description

BOUGIE DE PRÉCHAUFFAGE DE MOTEUR DIESEL  DIESEL ENGINE PREHEATING SPARK PLUG
Domaine de l'invention Field of the invention
La présente invention se rapporte à une bougie de préchauffage de moteur Diesel à crayon chauffant en céramique comprenant : The present invention relates to a glow plug of a diesel engine with a ceramic heating rod comprising:
- un corps tubulaire métallique dont une extrémité est terminée par un crayon chauffant en céramique et l'autre extrémité porte un embout de connexion, a metal tubular body, one end of which is terminated by a ceramic heating rod and the other end carrying a connection tip,
- le crayon chauffant logeant le conducteur chauffant intégré dans la céramique d'une cartouche chauffante,  - the heating rod housing the heating conductor integrated in the ceramic of a heating cartridge,
- une électrode traversant de manière isolée le corps tubulaire et reliant électriquement le filament chauffant de la cartouche chauffante et l'embout de connexion lui-même tenu de manière isolée dans l'extrémité du corps tubulaire.  - An electrode traversing the tubular body in isolation and electrically connecting the heating filament of the heating cartridge and the connection endpiece itself held in isolation in the end of the tubular body.
Etat de la technique  State of the art
Il existe de multiples réalisations de bougies de préchauffage du type défini ci-dessus.  There are multiple embodiments of glow plugs of the type defined above.
Selon un mode de réalisation connu, la bougie de préchauffage se compose d'un corps tubulaire métallique dont une extrémité constitue le crayon chauffant et l'autre est munie d'un embout de connexion. Près de cette extrémité, le corps métallique comporte un filetage extérieur pour se visser dans la culasse du moteur thermique et à l'autre extrémité, un cône pour positionner ainsi le crayon chauffant dans la chambre de combustion.  According to a known embodiment, the glow plug consists of a metal tubular body whose one end is the heating rod and the other is provided with a connection tip. Near this end, the metal body has an external thread for screwing into the cylinder head of the engine and at the other end, a cone to thereby position the heating rod in the combustion chamber.
Intérieurement, la bougie comporte une électrode centrale en forme de tige métallique traversant le corps tubulaire. Cette tige est reliée par une extrémité à l'embout de connexion et par son autre extrémité filetée elle est reliée, par vissage, à l'extrémité du fil de connexion électrique enroulé en hélice. Le fil de connexion électrique est solidaire de la céramique grâce à une brasure. Cette brasure assure aussi l'alimentation électrique par une extrémité du filament métallique intégré dans la céramique chauffante. L'autre extrémité du filament métallique est reliée, par une seconde brasure, au tube métallique de protection du crayon chauffant pour le retour électrique à la masse. L'ensemble des composants est maintenu en position par une poudre isolante compactée dans le tube de protection. Le contact électrique et le maintien en position sont obtenus par le compactage de cet ensemble tube/ poudre isolante autour des parties vissées, c'est-à-dire l'enroulement hélicoïdal et la partie filetée de l'électrode centrale. Cette dernière est elle-même tenue isolée dans le tube de protection par la poudre isolante compactée et le joint d'étanchéité. Cette bougie de préchauffage connue a l'inconvénient d'être réalisée avec un nombre relativement important de composants et de nécessiter un assemblage complexe avec compactage de la poudre isolante de sorte que finalement la bougie de préchauffage à crayon chauffant céramique est coûteuse. Internally, the candle has a central electrode in the form of a metal rod passing through the tubular body. This rod is connected at one end to the connection end and by its other threaded end it is connected, by screwing, to the end of the electrical connection wire wound helically. The electrical connection wire is secured to the ceramic through a solder. This solder also provides power to one end of the metal filament embedded in the heating ceramic. The other end of the metal filament is connected, by a second solder, to the protective metal tube of the heating rod for electrical return to ground. All the components are held in position by an insulating powder compacted in the protective tube. The electrical contact and the holding in position are obtained by compacting this tube / insulating powder assembly around the screwed parts, that is to say the helical winding and the threaded portion of the central electrode. The latter is itself kept isolated in the protective tube by the compacted insulating powder and the seal. This known glow plug has the disadvantage of being made with a relatively large number of components and requiring a complex assembly with compacting of the insulating powder so that finally the glow plug with ceramic heating rod is expensive.
But de l'invention Purpose of the invention
La présente invention a pour but de réaliser une bougie de préchauffage à crayon chauffant en céramique, de conception simple, permettant de résister efficacement aux contraintes de dilatation et de rétraction sous l'effet des fortes variations de températures auxquelles est soumise la bougie tout en simplifiant la structure et la réalisation de la bougie de préchauffage et réduisant ainsi son coût.  The object of the present invention is to provide a ceramic heater preheating candle, of simple design, which makes it possible to effectively withstand the stresses of expansion and retraction under the effect of the large variations in temperatures to which the candle is subjected while simplifying the structure and realization of the glow plug and thus reducing its cost.
Exposé et avantages de l'invention Description and advantages of the invention
A cet effet, l'invention a pour objet une bougie de préchauffage du type défini ci-dessus, caractérisée en ce que le chemin conducteur d'alimentation de la cartouche chauffante comprend :  For this purpose, the subject of the invention is a glow plug of the type defined above, characterized in that the conductive feed path of the heating cartridge comprises:
- un fil de connexion relié à l'électrode par une liaison solidaire bloquant l'extrémité arrière du fil de connexion à l'extrémité avant de l'électrode, a connection wire connected to the electrode by an integral connection blocking the rear end of the connection wire at the front end of the electrode,
- le fil de connexion ayant un segment intermédiaire entre son segment avant fixé à la cartouche chauffante et son segment arrière fixé à l'extrémité avant de l'électrode, ce segment intermédiaire étant en surlongueur par rapport à la longueur entre le point de fixation du fil de connexion à la cartouche chauffante et à l'électrode, en position de repos, pour avoir une longueur développée supérieure à l'allongement de la longueur à l'état de fonctionnement de la bougie de préchauffage, mise en température de fonctionnement. the connection wire having an intermediate segment between its front segment fixed to the heating cartridge and its rear segment fixed to the front end of the electrode, this intermediate segment being in excess of the length between the fixing point of the connecting wire to the heating cartridge and to the electrode, in the rest position, to have a developed length greater than the elongation of the length in the operating state of the glow plug, setting operating temperature.
La réalisation de bougie de préchauffage selon l'invention simplifie considérablement l'usinage et l'assemblage grâce à la suppression de poudre isolante et de son compactage. L'assemblage se fait par des opérations simples, telles que la mise en place des constituants par emmanchement, une soudure au laser, une déformation de la matière pour le sertissage et autres opérations simples. Les composants sont également obtenus par des procédés simples et usuels : le fil métallique de connexion est réalisé par un procédé simple de tréfilage, l'organe de centrage se fabrique par exemple par moulage sous pression de composite et l'électrode se fait par décolletage. Globalement, la simplification de l'assemblage évite des difficultés et réduit le coût de production. Suivant une autre caractéristique avantageuse, l'organe de blocage de l'électrode par rapport au corps tubulaire comprend : The embodiment of glow plug according to the invention greatly simplifies the machining and assembly through the removal of insulating powder and its compaction. The assembly is done by simple operations, such as placing the components by fitting, laser welding, deformation of the material for crimping and other simple operations. The components are also obtained by simple and usual methods: the connecting wire is made by a simple wire drawing process, the centering member is manufactured for example by press molding of composite and the electrode is made by bar turning. Overall, the simplification of the assembly avoids difficulties and reduces the cost of production. According to another advantageous characteristic, the blocking member of the electrode relative to the tubular body comprises:
- une surface d'accrochage constituée par une déformation locale de la surface de l'électrode,  a gripping surface constituted by a local deformation of the surface of the electrode,
- un manchon isolant engagé dans la surface d'accrochage,  an insulating sleeve engaged in the attachment surface,
- un sertissage du corps tubulaire comprimant le manchon dans la déformation locale de la surface d'accrochage de l'électrode pour solidariser mécaniquement le point de sertissage du corps tubulaire à la surface d'accrochage de l'électrode.  - A crimping of the tubular body compressing the sleeve in the local deformation of the attachment surface of the electrode to mechanically secure the crimping point of the tubular body to the gripping surface of the electrode.
Suivant une caractéristique particulière, la surface d'accrochage est constituée par un moletage.  According to a particular characteristic, the attachment surface is constituted by a knurling.
L'organe de blocage ainsi réalisé par la surface d'accrochage du bouchon isolant et le sertissage du corps tubulaire, solidarise le point de sertissage de l'électrode au point de sertissage du corps tubulaire qui reste ainsi solidaire pendant les mouvements d'allongement et de rétraction liés aux variations de température ou aux secousses et vibrations induites dans la bougie de préchauffage. Dans ces conditions, le segment de surlongueur peut bien jouer son rôle de compensation des allongements entre la cartouche chauffante et l'électrode.  The blocking member thus produced by the attachment surface of the insulating cap and the crimping of the tubular body, secures the crimping point of the electrode to the crimping point of the tubular body which thus remains integral during the elongation movements and shrinkage related to temperature variations or shaking and vibration induced in the glow plug. Under these conditions, the excess length segment can play its role of compensating for the elongations between the heating cartridge and the electrode.
Suivant une autre caractéristique avantageuse, le segment en surlongueur du fil de connexion a une forme choisie dans le groupe comprenant :  According to another advantageous characteristic, the segment in excess of the connection wire has a shape chosen from the group comprising:
- une forme en S dans le plan, une forme en Z dans le plan, une forme en S tridimensionnelle, une forme en Z tridimensionnelle,  an S-shape in the plane, a Z-shape in the plane, a three-dimensional S shape, a three-dimensional Z shape,
- une forme de spire(s).  - a form of turn (s).
Ces différentes formes données au segment en surlongueur sont simples à réaliser et à mettre en place dans le corps de la bougie de préchauffage.  These different shapes given to the segment in excess length are simple to make and put in place in the body of the glow plug.
Suivant une autre caractéristique avantageuse, l'organe de centrage est une pièce cylindrique, de révolution, traversée par un perçage axial pour le passage de l'extrémité arrière du fil de connexion et une cavité arrière recevant, sans jeu radial, l'extrémité avant de l'électrode, et According to another advantageous characteristic, the centering member is a cylindrical piece, of revolution, traversed by an axial bore for the passage of the rear end of the connection wire and a rear cavity receiving, without radial play, the front end. electrode, and
- l'ouverture de l'enveloppe du crayon chauffant comporte un lamage pour recevoir en butée l'organe de centrage. - The opening of the heating rod casing comprises a counterbore for receiving in abutment the centering member.
Cette forme de réalisation est non seulement simple en tant que telle mais elle facilite aussi la mise en place du chemin conducteur dans la bougie de préchauffage. Suivant une autre caractéristique avantageuse, l'extrémité arrière du fil de connexion est reliée à l'extrémité avant de l'électrode par une soudure ou un sertissage. This embodiment is not only simple as such but it also facilitates the introduction of the conductive path in the glow plug. According to another advantageous characteristic, the rear end of the connection wire is connected to the front end of the electrode by welding or crimping.
L'extrémité arrière du fil de connexion est ainsi solidarisée à l'électrode de sorte que la distance variable que compense le segment en surlongueur est celle du mouvement relatif des fixations des extrémités du fil de connexion d'une part à la cartouche chauffante et d'autre part à l'électrode.  The rear end of the connecting wire is thus secured to the electrode so that the variable distance compensated by the segment in excess is that of the relative movement of the fasteners of the ends of the connection wire on the one hand to the heating cartridge and d the other hand to the electrode.
Suivant une autre caractéristique avantageuse, de manière particulière, l'extrémité de l'électrode comporte un logement axial recevant l'extrémité du fil de connexion bloquée dans le logement axial par une soudure à travers la paroi de l'extrémité ou par sertissage de l'extrémité sur l'extrémité arrière du fil de connexion.  According to another advantageous characteristic, in particular, the end of the electrode comprises an axial housing receiving the end of the connection wire locked in the axial housing by a weld through the wall of the end or by crimping the end on the back end of the lead wire.
Cette forme de réalisation de la liaison entre le fil de connexion et l'électrode est d'une réalisation est d'une mise en place particulièrement simple.  This embodiment of the connection between the connection wire and the electrode is of one embodiment is a particularly simple implementation.
Suivant une autre caractéristique avantageuse, l'extrémité arrière de l'électrode est moletée et l'embout de connexion comporte un logement cylindrique recevant l'extrémité de l'électrode pour être sertie sur le moletage.  According to another advantageous characteristic, the rear end of the electrode is knurled and the connection end has a cylindrical housing receiving the end of the electrode to be crimped on the knurling.
L'invention a également pour objet un procédé de réalisation d'une bougie de préchauffage telle que définie ci-dessus, caractérisé en ce que  The invention also relates to a method for producing a glow plug as defined above, characterized in that
- on assemble le fil de connexion à la cartouche chauffante par brasure et on installe la cartouche dans l'enveloppe en la fixant par une brasure assurant également le contact électrique entre le filament chauffant et l'enveloppe métallique,  - The connection wire is assembled to the heating cartridge by brazing and the cartridge is installed in the casing by fixing it by a solder also ensuring the electrical contact between the heating filament and the metal casing,
- on place l'organe de centrage dans l'embase de l'enveloppe métallique en enfilant l'extrémité arrière du fil de connexion dans le perçage de l'organe de centrage,  the centering element is placed in the base of the metal casing by threading the rear end of the connection wire into the hole in the centering member,
- on assemble l'électrode à l'extrémité arrière du fil de connexion,  the electrode is assembled at the rear end of the connection wire,
- on met en place le manchon sur le moletage de l'électrode et on met en place le corps tubulaire en le fixant à l'embase épaisse par une soudure puis, on bloque l'électrode par le sertissage sur le moletage de l'électrode avec interposition du manchon isolant,  the sleeve is placed on the knurling of the electrode and the tubular body is put in place by fixing it to the thick base by means of a weld, and then the electrode is locked by crimping on the knurling of the electrode. with interposition of the insulating sleeve,
- on installe le manchon isolant dans le lamage de la zone arrière du corps tubulaire, et - on emmanche de force le manchon de l'embout de connexion avec interposition du manchon isolant et on sertit l'ensemble embout/moletage électrode. installing the insulating sleeve in the countersink of the rear zone of the tubular body, and the sleeve of the connecting piece is force-fitted by force with the interposition of the insulating sleeve and the tip / knurling electrode assembly is crimped.
Dessins  drawings
La présente invention sera décrite ci-après de manière plus détaillée à l'aide d'exemples de réalisation d'une bougie de préchauffage de moteur diesel représentée schématiquement dans les dessins annexés dans lesquels :  The present invention will be described hereinafter in more detail with the aid of examples of embodiment of a diesel engine glow plug shown schematically in the accompanying drawings in which:
- la figure 1 est une coupe axiale de la bougie de préchauffage,  FIG. 1 is an axial section of the glow plug,
- la figure 2 est une vue de détail du chemin conducteur d'alimentation de l'élément chauffant, FIG. 2 is a detailed view of the conductive feed path of the heating element,
- la figure 3A est une vue de détail du fil de connexion selon un premier mode de réalisation,  FIG. 3A is a detailed view of the connection wire according to a first embodiment,
- la figure 3B est une vue de détail du fil de connexion selon un second mode de réalisation,  FIG. 3B is a detail view of the connection wire according to a second embodiment,
- la figure 4A est une vue schématique d'un fil de connexion et de l'extrémité de l'électrode laquelle il est relié selon un premier mode de réalisation,  FIG. 4A is a schematic view of a connection wire and the end of the electrode to which it is connected according to a first embodiment,
- la figure 4B montre une autre variante d'assemblage du fil de con- nexion et de l'électrode, à laquelle il est relié selon un second mode de réalisation,  FIG. 4B shows another connection variant of the connection wire and the electrode, to which it is connected according to a second embodiment,
- la figure 5 est une vue en coupe montrant l'assemblage isolant de l'extrémité avant de l'électrode dans l'organe de centrage elle même fixée à l'extrémité arrière du crayon chauffant dans l'enveloppe métallique, - la figure 6 est une vue en coupe montrant le sertissage de la zone intermédiaire de l'électrode dans le corps de la bougie de préchauffage, FIG. 5 is a sectional view showing the insulating assembly of the front end of the electrode in the centering element itself attached to the rear end of the heating rod in the metal casing, FIG. 6 is a sectional view showing the crimping of the intermediate zone of the electrode in the body of the glow plug,
- la figure 7 est une vue de détail en coupe de l'assemblage de l'embout de connexion et du manchon isolant au corps tubulaire. - Figure 7 is a detail sectional view of the assembly of the connecting piece and the insulating sleeve to the tubular body.
Description de modes de réalisation de l'invention  Description of Embodiments of the Invention
Par convention, pour simplifier la description, on utilisera la notion d'orientation "avant"/ "arrière" dans les différentes figures, l'avant ou côté gauche des figures correspondant au côté du crayon chauffant de la bougie et l'arrière ou côté droit correspondant au côté de l'embout de connexion de la bougie de préchauffage .  By convention, to simplify the description, we will use the notion of "forward" / "backward" orientation in the different figures, the front or left side of the figures corresponding to the side of the heating rod of the candle and the back or side right corresponding to the side of the connection tip of the glow plug.
Selon la figure 1 , la bougie de préchauffage se compose d'un corps tubulaire 1 relié par une extrémité 1 1 à un crayon chauffant céramique 2, l'autre extrémité 12 étant reliée à un embout de connexion 3. Le cône 26 de la bougie de préchauffage assure le centrage et l'étanchéité en appui dans la culasse. La bougie est bloquée en position par vissage du filetage 13 dans la culasse du moteur, et grâce au dépassement de la cartouche chauffante 22 par rapport au cône 26, le crayon chauffant 2 vient en saillie dans la chambre de combustion pour assurer le préchauffage. L'embout de connexion 3 est relié au circuit électrique de bord (non représenté) par la commande de préchauffage elle-même non représentée. Il s'agit de moyens connus en général qui ne nécessitent ni description détaillée ni représentation particulière. According to FIG. 1, the glow plug consists of a tubular body 1 connected at one end 1 1 to a ceramic heating rod 2, the other end 12 being connected to a connecting piece 3. The cone 26 of the glow plug ensures the centering and sealing support in the cylinder head. The spark plug is locked in position by screwing the thread 13 into the cylinder head of the engine, and by passing the heating cartridge 22 relative to the cone 26, the heating rod 2 protrudes into the combustion chamber to preheat. The connector 3 is connected to the electrical circuit board (not shown) by the preheating control itself not shown. These are generally known means that do not require detailed description or particular representation.
Le crayon chauffant 2 fonctionne comme une résistance chauffante reliée d'un côté à la masse par l'appui du cône 26 dans la culasse et par son enveloppe métallique, elle-même reliée électriquement au corps 1 qui est aussi à la masse par son vissage 13 dans la culasse. L'autre extrémité du crayon chauffant 2 est reliée au circuit électrique de bord par le chemin conducteur « + » à travers le fil de connexion 4, l'électrode 5 passant dans le corps 1 et reliée à l'embout de connexion 3.  The heating pencil 2 operates as a heating resistor connected on one side to the ground by the support of the cone 26 in the cylinder head and by its metal shell, itself electrically connected to the body 1 which is also grounded by its screwing 13 in the breech. The other end of the heating rod 2 is connected to the electrical circuit board by the conductive path "+" through the connection wire 4, the electrode 5 passing through the body 1 and connected to the connection tip 3.
Le crayon chauffant 2 se compose d'une enveloppe métallique 21 en forme de doigt logeant une cartouche chauffante 22 en céramique intégrant un conducteur chauffant par effet Joule. L'enveloppe métallique 21 , mince au niveau de la cartouche chauffante 22 se termine par une embase épaisse 24 formant un cône d'étanchéité 26 et elle est munie d'un lamage 25 au-delà du volume libre 23 subsistant dans l'enveloppe 21 derrière la cartouche chauffante 22.  The heating pencil 2 consists of a metal shell 21 in the form of a finger housing a heating cartridge 22 made of ceramic incorporating a heating conductor Joule effect. The metal casing 21, thin at the level of the heating cartridge 22, terminates in a thick base 24 forming a sealing cone 26 and is provided with a countersink 25 beyond the free volume 23 remaining in the casing 21 behind the heating cartridge 22.
La cartouche chauffante 22 est reliée à l'extrémité avant 41 d'un fil de connexion 4 ayant un segment intermédiaire 42 et une extrémité arrière 43 fixée à l'extrémité avant 51 d'une électrode 5 logée dans le corps tubulaire 1.  The heating cartridge 22 is connected to the front end 41 of a connection wire 4 having an intermediate segment 42 and a rear end 43 fixed to the front end 51 of an electrode 5 housed in the tubular body 1.
L'électrode 5 est une tige métallique de section circulaire occupant toute la longueur du corps tubulaire 1 et ayant une extrémité avant 51 munie d'un logement 52 tel qu'un perçage axial pour recevoir et fixer l'extrémité arrière 43 du fil de connexion 4. L'électrode 5 a un moletage 53 en position intermédiaire et elle se termine par une extrémité 54 également munie d'un moletage pour recevoir l'embout de connexion 3.  The electrode 5 is a metal rod of circular section occupying the entire length of the tubular body 1 and having a front end 51 provided with a housing 52 such as an axial bore for receiving and fixing the rear end 43 of the connection wire 4. The electrode 5 has a knurling 53 in the intermediate position and it ends with an end 54 also provided with a knurling to receive the connecting piece 3.
Le chemin conducteur alimentant la cartouche chauffante 22, constitué par le fil de connexion 4, l'électrode 5 et l'embout 3 ; ce chemin est positionné de manière isolé électriquement par rapport à l'enveloppe métallique 21 du crayon chauffant 2 et du corps tubulaire 1 à une extrémité par un organe de centrage 6 recevant les extrémités 43 du fil de connexion 4, 51 de l'électrode 5 au niveau de leur jonction, en position intermédiaire par un manchon de blocage 7 et à l'autre extrémité par un manchon d'extrémité 8. The conductive path feeding the heating cartridge 22, constituted by the connection wire 4, the electrode 5 and the tip 3; this path is positioned electrically isolated from the metal casing 21 of the heating rod 2 and the tubular body 1 at one end by a centering member 6 receiving the ends 43 of the wire of connection 4, 51 of the electrode 5 at their junction, in intermediate position by a locking sleeve 7 and at the other end by an end sleeve 8.
L'organe de centrage 6 est une pièce en matière isolante ré- fractaire, de forme cylindrique traversée par un perçage 61 et munie à l'arrière d'un logement 62 de façon à permettre le passage et la tenue centrée de l'extrémité arrière 43 du fil de connexion 4 et recevoir dans son logement 62 l'extrémité avant 51 de l'électrode 5. L'organe de centrage 6 maintient l'extrémité de l'électrode 5 sans jeu radial. L'organe de centrage 6 est lui-même logé en partie, sans jeu radial, dans le lamage 25 de l'enveloppe métallique 24 du crayon chauffant 2. L'organe de centrage 6 est par exemple réalisé en composite DURATON 700PI (marque déposée) de la firme QUADRANT.  The centering member 6 is a piece of refractory insulating material, of cylindrical shape traversed by a bore 61 and provided at the rear with a housing 62 so as to allow the passage and the centered holding of the rear end. 43 of the connection wire 4 and receive in its housing 62 the front end 51 of the electrode 5. The centering member 6 maintains the end of the electrode 5 without radial play. The centering member 6 is itself housed in part, without radial play, in the countersink 25 of the metal casing 24 of the heating rod 2. The centering member 6 is for example made of composite DURATON 700PI (trademark ) of the firm QUADRANT.
L'électrode 5 est bloquée en position dans le corps tubulaire 1 par l'intermédiaire du manchon isolant 7 comprimé sur et dans le moletage 53 par la déformation de sertissage 14 du corps tubulaire 1. L'électrode 5 est ainsi immobilisée en translation et en rotation par rapport au corps tubulaire 1.  The electrode 5 is locked in position in the tubular body 1 by means of the insulating sleeve 7 compressed on and in the knurling 53 by the crimping deformation 14 of the tubular body 1. The electrode 5 is thus immobilized in translation and in translation. rotation relative to the tubular body 1.
Le moletage 53 constitue de façon générale un exemple de surface d'accrochage réalisée par une déformation locale de la surface de l'électrode 5 pour permettre l'accrochage du manchon isolant 7.  The knurling 53 is generally an example of a hooking surface produced by a local deformation of the surface of the electrode 5 to allow the insulating sleeve 7 to catch on.
L'extrémité arrière 54 de l'électrode 5 est moletée pour recevoir l'embout de connexion 3 qui se compose d'un manchon 31 suivi d'une collerette 32 et d'une broche ou patte de connexion 33. L'embout 3 est fixé à l'électrode 5 par son sertissage 34 sur le moletage de l'extrémité 54.  The rear end 54 of the electrode 5 is knurled to receive the connector 3 which consists of a sleeve 31 followed by a flange 32 and a pin or connection tab 33. The tip 3 is attached to the electrode 5 by its crimping 34 on the knurling of the end 54.
L'embout de connexion 3 est reçu de manière isolée électriquement dans l'extrémité arrière 12 du corps tubulaire 1 avec interposition d'un manchon isolant 8.  The connecting piece 3 is electrically isolated in the rear end 12 of the tubular body 1 with the interposition of an insulating sleeve 8.
Le corps tubulaire 1 est muni extérieurement d'un filetage 13 pour son vissage dans le moteur thermique, son extrémité arrière 12 comportant une prise d'outil 15, par exemple en forme d'écrou à six pans pour le vissage/ dévissage de la bougie de préchauffage dans le moteur.  The tubular body 1 is externally provided with a thread 13 for its screwing into the heat engine, its rear end 12 comprising a tool socket 15, for example in the form of a hexagon nut for screwing / unscrewing the candle. preheating in the engine.
Le corps tubulaire 1 est soudé à l'enveloppe métallique 24 du crayon chauffant 2 par la soudure 16.  The tubular body 1 is welded to the metal casing 24 of the heating rod 2 by the weld 16.
Le segment 42 du fil de connexion 4 est un segment en surlongueur par rapport à deux points de référence de la bougie de préchauffage, par exemple la longueur (L) prise entre la soudure 55 dans l'électrode 5 qui solidarise le fil 43 et l'extrémité arrière de la cartouche 22, cette Ion- gueur étant la mesure de cet intervalle lorsque la bougie est au repos à température ambiante, alors qu'en fonctionnement la distance entre ces deux points de référence augmente fortement. The segment 42 of the connection wire 4 is a segment in excess of length relative to two reference points of the glow plug, for example the length (L) taken between the solder 55 in the electrode 5 which secures the wire 43 and the the rear end of the cartridge 22, this Ion- Since this is the measurement of this interval when the candle is at rest at ambient temperature, while in operation the distance between these two reference points increases sharply.
Le segment en surlongueur 42 a une longueur développée ou plus précisément une surlongueur, nettement supérieure à l'augmentation de la longueur (L) sous l'effet de la dilatation résultant de l'élévation de température de la bougie de préchauffage en fonctionnement, de façon à ne pas induire d'effort de traction à la brasure d'assemblage entre l'arrière de la céramique 22 et l'extrémité du fil de connexion 41. Cette surlongueur se calcule facilement à partir des données géométriques de la bougie de préchauffage et des coefficients de dilatation thermique des matériaux constituant la bougie de préchauffage. Ce segment en surlongueur 42 assure la même fonction de protection quand la bougie est soumise à de fortes rétractions dues au grand froid à l'arrêt du moteur.  The segment in excess of length 42 has a developed length or more precisely an excess length, much greater than the increase in length (L) under the effect of the expansion resulting from the temperature rise of the glow plug in operation, of so as not to induce tensile force at the solder assembly between the back of the ceramic 22 and the end of the connecting wire 41. This excess length is easily calculated from the geometric data of the glow plug and coefficients of thermal expansion of the materials constituting the glow plug. This longer segment 42 provides the same protection function when the candle is subjected to strong retractions due to cold weather when the engine stops.
Plus précisément, le segment en surlongueur 42 assure à la fois l'amortissement des dilatations/ rétractions qui correspondent à de fortes variations de la longueur axiale des différents composants de la bougie, dues aux mouvements de dilatation et de rétraction de ces composants qui entourent et maintiennent en position les éléments du circuit intérieur de la bougie, c'est-à-dire de la liaison entre l'extrémité de l'élément chauffant et la fiche de connexion. Ces dilatations et rétractions très fortes sont dues aux variations des températures extrêmes que subit la bougie de préchauffage dans les phases de démarrage à froid et en fonctionnement continu du moteur. Le segment en surlongueur 42 permet d'encaisser non seulement les variations de longueur axiale mais aussi les contraintes radiales dues à des défauts d'alignement entre le crayon chauffant 2, le fil de connexion 4, l'organe de centrage 6 et l'électrode 5.  More specifically, the segment in excess length 42 provides both the damping of the expansions / retractions which correspond to large variations in the axial length of the various components of the candle, due to the movements of expansion and retraction of these components that surround and maintain in position the elements of the internal circuit of the spark plug, that is to say, the connection between the end of the heating element and the connection plug. These very strong expansions and retractions are due to variations in the extreme temperatures that the glow plug experiences during cold start and continuous engine operation. The segment in excess length 42 makes it possible to collect not only the axial length variations but also the radial stresses due to misalignment between the heating rod 2, the connection wire 4, the centering member 6 and the electrode 5.
Le segment en surlongueur 42 permet également d'absorber les vibrations induites dans la bougie de préchauffage par le fonctionnement du moteur.  The segment in excess of length 42 also makes it possible to absorb the vibrations induced in the glow plug by the operation of the engine.
La surlongueur du segment 42 est réalisée en pratique par une forme bi ou tridimensionnelle en S, Z ou à une ou plusieurs spires ou enroulements mais avec un contour global nettement réduit par rapport à la section libre de la chambre 23 pour éviter tout contact électrique qui résulterait d'une dilatation ou déformation sous l'effet des variations de température ou des effets mécaniques tels que le chocs ou les vibrations produits pendant le fonctionnement de l'équipement (véhicule) ayant une telle bougie de préchauffage. L'extrémité avant 51 de l'électrode 5 vient en appui axial au fond du logement 62 de l'organe de centrage 6 lui-même en appui axial au fond du lamage 25 de l'enveloppe métallique 21. Le maintien en position ou immobilisation de l'électrode 5 n'est pas assuré par sa liaison avec le fil de connexion 4 qui n'a que pour fonction d'assurer la liaison électrique. Pour empêcher tout mouvement ou rotation de l'électrode 5, celle-ci est bloquée par le manchon isolant 7 et son sertissage. Le manchon isolant 7 est en une matière composite PA66 isolante électrique et qui résiste bien aux fortes pressions. Le manchon 7 est emmanché et tenu sur l'électrode 5 avant la mise en place du corps tubulaire 1 pour être ensuite comprimé par la déformation 14 du corps tubulaire 1. Par cette déformation de la matière du corps 1 , la matière du manchon 7 s'imprime dans la zone mo- letée 53 pour y immobiliser ainsi définitivement l'électrode 5. Cette immobilisation de l'électrode 5 garantit deux fonctions essentielles de la bougie de préchauffage à savoir l'absence de mouvement du fil de connexion 4 autre que l'extension/ rétraction de son segment en surlongueur, et la fixation de l'embout de connexion 3. The length of the segment 42 is practically achieved by a two or three-dimensional shape in S, Z or in one or more turns or windings but with a substantially reduced overall contour with respect to the free section of the chamber 23 to avoid any electrical contact which would result from expansion or deformation due to changes in temperature or mechanical effects such as shocks or vibrations generated during operation of the equipment (vehicle) having such a glow plug. The front end 51 of the electrode 5 bears axially at the bottom of the housing 62 of the centering member 6 itself in axial support at the bottom of the countersink 25 of the metal casing 21. The holding in position or immobilization of the electrode 5 is not ensured by its connection with the connection wire 4 whose only function is to provide the electrical connection. To prevent any movement or rotation of the electrode 5, it is blocked by the insulating sleeve 7 and its crimping. The insulating sleeve 7 is made of an insulating PA66 composite material that is resistant to high pressures. The sleeve 7 is fitted and held on the electrode 5 before the introduction of the tubular body 1 to be subsequently compressed by the deformation 14 of the tubular body 1. By this deformation of the material of the body 1, the material of the sleeve 7 s In this way, the electrode 5 is immobilized in the motor zone 53 to immobilize the electrode 5 in this way. This immobilization of the electrode 5 guarantees two essential functions of the glow plug, namely the absence of movement of the connection wire 4 other than the extension / retraction of its segment in excess length, and the fixing of the connector 3.
La figure 2 montre le chemin conducteur d'alimentation du crayon chauffant 2, composé du fil de connexion 4 relié à la cartouche chauffante 22, l'électrode 5 reliée au fil de connexion et l'extrémité moletée 12 de l'électrode.  Figure 2 shows the conductive feed path of the heating rod 2, composed of the connecting wire 4 connected to the heating cartridge 22, the electrode 5 connected to the connection wire and the knurled end 12 of the electrode.
L'organe de centrage 6 est engagé sur le fil de connexion 4 puisque l'extrémité arrière 43 du fil de connexion 4 est déjà soudée par la soudure 55 à l'extrémité avant 51 de l'électrode 5.  The centering member 6 is engaged on the connection wire 4 since the rear end 43 of the connection wire 4 is already soldered by the solder 55 to the front end 51 of the electrode 5.
Le manchon isolant 7 peut également être déjà installé sur la surface d'accrochage ou zone moletée 53. En revanche, l'embout 3 n'est pas installé puisqu'il faut mettre en place d'abord le corps tubulaire 1.  The insulating sleeve 7 may also be already installed on the hooking surface or knurled area 53. On the other hand, the endpiece 3 is not installed since it is necessary to set up the tubular body 1 first.
La liaison entre le fil de connexion 4 et l'électrode 5 est une soudure 55, l'autre variante celle du sertissage représentée en Fig.4B.  The connection between the connection wire 4 and the electrode 5 is a solder 55, the other variant of the crimp shown in Fig.4B.
Les figures 3A, 3B montrent le détail d'un exemple de fil de connexion 4 représenté seul. Dans les deux cas, les extrémités avant 41 et arrière 43 sont identiques et seule diffère la forme des segments en surlongueur 42. L'extrémité avant 41 des fils de connexion 4, a une forme de cône en creux schématisé ici par un «V » pour être fixée à l'arrière de la cartouche chauffante 22 en céramique par brasure.  Figures 3A, 3B show the detail of an example of connection wire 4 shown alone. In both cases, the front ends 41 and rear 43 are identical and only differs the shape of the segments in excess length 42. The front end 41 of the connection son 4, has a hollow cone shape schematized here by a "V" to be attached to the back of the heater cartridge 22 ceramic solder.
Selon la figure 3A, le fil de connexion 4A a un segment en surlongueur 42A avec une forme arrondie en Z. Il peut s'agir d'une spire dans un plan ou d'une spire tridimensionnelle. L'extrémité avant 41 est cône en creux pour faciliter son parfait centrage et sa fixation par brasure à l'extrémité arrière de la cartouche chauffante 22 qui est aussi de forme conique. According to FIG. 3A, the connection wire 4A has an over-long segment 42A with a rounded Z-shape. It may be a turn in a plane or a three-dimensional turn. The front end 41 is hollow cone to facilitate its perfect centering and solder attachment to the rear end of the heating cartridge 22 which is also conical.
Le segment en surlongueur 42B du fil de connexion 4B se- Ion la figure 3B a une forme de W ce qui lui assure une surlongueur importante. L'extrémité avant 41 est cône en creux pour faciliter son parfait centrage et sa fixation par brasure à l'extrémité arrière de la cartouche chauffante 22 qui est aussi de forme conique.  The extended segment 42B of the lead wire 4B in FIG. 3B has a W-shape which provides it with a large excess length. The front end 41 is hollow cone to facilitate its perfect centering and solder attachment to the rear end of the heating cartridge 22 which is also conical.
La figure 4A montre le fil de connexion 4A et sa liaison à l'extrémité avant 51 de l'électrode 5. L'extrémité arrière 43 est placée dans le logement 52 de l'extrémité 51 de l'électrode 5 en y étant bloquée par une soudure 55 ponctuelle, à travers l'épaisseur de cette extrémité 51. Cette soudure est réalisée au laser.  FIG. 4A shows the connection wire 4A and its connection to the front end 51 of the electrode 5. The rear end 43 is placed in the housing 52 of the end 51 of the electrode 5, being blocked there by a spot welding 55, through the thickness of this end 51. This welding is performed by laser.
La figure 4B montre une autre variante d'assemblage du fil de connexion 4A à l'extrémité avant 51 de l'électrode 5. L'extrémité 43 est placée dans le logement 52 avant d'y être bloquée par le sertissage 56.  FIG. 4B shows another assembly variant of the connection wire 4A at the front end 51 of the electrode 5. The end 43 is placed in the housing 52 before being blocked by the crimping 56.
La figure 5 montre une vue de détail de détail de l'extrémité arrière de l'enveloppe 22 avec son embase 24 et son lamage 25 recevant l'organe de centrage 6 qui lui-même reçoit l'extrémité avant 51 de l'élec- trode 5. La figure 5 ne montre que l'assemblage de ces trois pièces sans le fil de connexion 4 qui normalement traverse d'abord le perçage 61 de l'organe de centrage 6 pour être ensuite fixé à l'extrémité avant 51 de l'électrode 5.  FIG. 5 shows a detailed detail view of the rear end of the casing 22 with its base 24 and its countersink 25 receiving the centering member 6 which itself receives the front end 51 of the elec- Figure 5 shows only the assembly of these three parts without the connection wire 4 which normally first passes through the bore 61 of the centering member 6 to be then attached to the front end 51 of the electrode 5.
La figure 6 est une vue de détail partielle de la zone de ré- treint ou de sertissage 14 du corps 1 sur le manchon d'isolation 7 lui- même accroché au moletage 53 de l'électrode 5 pour la bloquer.  FIG. 6 is a partial detail view of the zone of crimping or crimping 14 of the body 1 on the insulating sleeve 7 itself attached to the knurling 53 of the electrode 5 to block it.
La figure 7 est une vue de détail partielle de la zone de mise en place de la surface externe 81 du manchon isolant 8 dans le diamètre du lamage 17 du corps tubulaire 1. Le manchon isolant 8 est mis en butée au fond de ce lamage 17 du corps 1. Le manchon 31 de l'embout de connexion 3 est mis place dans la surface interne 82 du manchon d'isolation 8 par emmanchement en force à la presse. Cette mise en place en force a pour conséquence de créer une forte pression entre le manchon 31 de l'embout de connexion 3 et la surface interne 82 du manchon isolant 8 qui à son tour exerce une pression sur le diamètre du lamage 17 du corps tubulaire 1 par l'intermédiaire de la surface externe 81. Ainsi compressés, l'embout de connexion 3, le manchon d'isolation 8 et le corps tubulaire 1 sont parfaitement étanche. Le montage de la bougie de préchauffage selon l'invention se fait simplement après avoir réalisé les différents composants : FIG. 7 is a partial detail view of the zone of placement of the outer surface 81 of the insulating sleeve 8 in the diameter of the counterbore 17 of the tubular body 1. The insulating sleeve 8 is abutted at the bottom of this counterbore 17 of the body 1. The sleeve 31 of the connecting piece 3 is placed in the inner surface 82 of the insulation sleeve 8 by force-fitting to the press. This placing in force has the effect of creating a high pressure between the sleeve 31 of the connecting piece 3 and the inner surface 82 of the insulating sleeve 8 which in turn exerts pressure on the diameter of the countersink 17 of the tubular body 1 through the outer surface 81. Thus compressed, the connection tip 3, the insulation sleeve 8 and the tubular body 1 are perfectly sealed. The mounting of the glow plug according to the invention is done simply after having made the various components:
Tout d'abord, on assemble le fil de connexion 4 à la cartouche chauffante 22 par brasure, la cartouche étant elle-même installée dans l'enveloppe 21 par une seconde brasure. Puis, simultanément, on engage l'organe de centrage 6 dans le lamage 25 et l'extrémité arrière 43 dans le perçage 61. Ensuite, on assemble l'électrode 5 à l'extrémité arrière 43 en soudant ou en sertissant l'extrémité 51 sur l'extrémité arrière 43 pour solidariser la liaison.  First, the connection wire 4 is assembled to the heating cartridge 22 by soldering, the cartridge being itself installed in the envelope 21 by a second solder. Then, simultaneously, the centering member 6 is engaged in the countersink 25 and the rear end 43 in the bore 61. Then, the electrode 5 is assembled at the rear end 43 by welding or crimping the end 51 on the rear end 43 to secure the connection.
Le manchon 7 est de préférence mis en place de façon serrée sur le moletage 53 avant la mise en place du corps tubulaire 1 , de façon à rester à la bonne place sur l'électrode 5.  The sleeve 7 is preferably placed tightly on the knurling 53 before the introduction of the tubular body 1, so as to remain in the right place on the electrode 5.
L'étape suivante est le positionnement du corps tubulaire 1 par rapport à l'embase épaisse 24 de la cartouche chauffante 2 pour réa- liser l'assemblage définitif par la soudure 16 et ensuite bloquer l'électrode 5 par le sertissage 14 du corps tubulaire 1 sur le moletage 53 avec interposition du manchon isolant 7.  The next step is the positioning of the tubular body 1 relative to the thick base 24 of the heating cartridge 2 to carry out the final assembly by the weld 16 and then block the electrode 5 by the crimping 14 of the tubular body 1 on the knurling 53 with interposition of the insulating sleeve 7.
L'avant dernière étape consiste à installer le manchon isolant 8 par contact de la surface externe 81 dans le diamètre du lamage 17 de la zone 12 du corps tubulaire 1.  The penultimate step is to install the insulating sleeve 8 by contact of the outer surface 81 in the diameter of the countersink 17 of the zone 12 of the tubular body 1.
La dernière étape consiste à emmancher en force le manchon 31 de l'embout de connexion 3 dans l'extrémité arrière 12 du corps tubulaire 1 avec interposition du manchon isolant 8 et de solidariser l'ensemble embout/ électrode par le sertissage 34.  The last step consists in force-fitting the sleeve 31 of the connecting piece 3 into the rear end 12 of the tubular body 1 with interposition of the insulating sleeve 8 and securing the tip / electrode assembly by crimping 34.
Ces différentes étapes de fabrication et de montage sont très simples, rapides et aboutissent à une bougie de préchauffage économique. These different stages of manufacture and assembly are very simple, fast and lead to an economical glow plug.
NOMENCLATURE corps tubulaire NOMENCLATURE tubular body
1 1 extrémité avant 1 1 front end
12 extrémité arrière 12 rear end
13 filetage extérieur  13 external thread
14 zone de ré treint/ sertissage  14 crease / crimping area
15 prise d'outil  15 tool socket
16 soudure embase épaisse et corps tubulaire 17 lamage  16 solder plate thick and tubular body 17 countersink
crayon chauffant  heating pencil
21 enveloppe métallique  21 metal envelope
22 cartouche chauffante  22 heating cartridge
23 volume libre/ chambre  23 free volume / chamber
24 embase épaisse 24 thick base
25 lamage  25 coinage
26 cône d'étanchéité  26 sealing cone
embout de connexion  connection tip
31 manchon 31 sleeve
32 collerette 32 collar
33 broche/ patte de connexion  33 pin / connection tab
34 sertissage  34 crimping
fil de connexion  connection wire
41 extrémité avant 41 front end
42 segment intermédiaire/ segment en surlongueur42 intermediate segment / extended segment
43 extrémité arrière 43 rear end
électrode  electrode
51 extrémité avant  51 front end
52 logement  52 housing
53 moletage/ surface d'accrochage 53 knurling / hanging surface
54 extrémité arrière / extrémité arrière moletée 54 rear end / knurled rear end
55 soudure électrode et fil de connexion 55 welding electrode and wire connection
56 ré treint/ sertissage  56 re-crimped / crimped
organe de centrage  centering member
61 perçage 61 drilling
62 logement  62 housing
manchon isolant  insulating sleeve
manchon isolant surface externe surface interne insulating sleeve outer surface inner surface

Claims

R E V E N D I C A T I O N S R E V E N D I C A T IO N S
1°) Bougie de préchauffage comprenant : 1 °) Glow plug comprising:
- un corps tubulaire métallique (1) dont une extrémité (1 1) est terminée par un crayon chauffant en céramique (2) et l'autre extrémité (12) porte un embout de connexion (3),  a metal tubular body (1), one end (1 1) of which is terminated by a ceramic heating rod (2) and the other end (12) carrying a connecting end (3),
- le crayon chauffant (2) logeant le conducteur chauffant intégré dans la céramique d'une cartouche chauffante (22),  - the heating rod (2) housing the heating conductor integrated in the ceramic of a heating cartridge (22),
- une électrode (5) traversant de manière isolée le corps tubulaire (1) et reliant électriquement le conducteur chauffant de la cartouche chauf- fante (22) et l'embout de connexion (3) lui-même tenu de manière isolée dans l'extrémité du corps tubulaire (1),  an electrode (5) passing through the tubular body (1) and electrically connecting the heating conductor of the heating cartridge (22) and the connecting end (3) itself held in isolation in the end of the tubular body (1),
bougie caractérisée en ce que candle characterized in that
le chemin conducteur d'alimentation de la cartouche chauffante (22) comprend : the conductive path for supplying the heating cartridge (22) comprises:
- un fil de connexion (4) relié à l'électrode (5) par une liaison solidaire bloquant l'extrémité arrière (43) du fil de connexion (4) à l'extrémité avant (51) de l'électrode (5), - a connection wire (4) connected to the electrode (5) by an integral connection blocking the rear end (43) of the connection wire (4) at the front end (51) of the electrode (5) ,
- le fil de connexion (4) ayant un segment intermédiaire (42) entre son segment avant (41) fixé à la cartouche chauffante (22) et son segment arrière (43) fixé à l'extrémité avant (51) de l'électrode (5), ce segment intermédiaire (43) étant en surlongueur par rapport à la longueur (L) entre les points de fixation (41) du fil de connexion (4) à la cartouche chauffante (22) et l'électrode (5), en position de repos, pour avoir une longueur développée supérieure à l'allongement de la longueur (L) à l'état de fonctionnement de la bougie de préchauffage, mise en température de fonctionnement.  the connecting wire (4) having an intermediate segment (42) between its front segment (41) attached to the heating cartridge (22) and its rear segment (43) fixed to the front end (51) of the electrode (5), this intermediate segment (43) being longer than the length (L) between the attachment points (41) of the connection wire (4) to the heating cartridge (22) and the electrode (5) , in the rest position, to have a developed length greater than the elongation of the length (L) in the operating state of the glow plug, setting operating temperature.
2°) Bougie de préchauffage selon la revendication 1 , 2 °) Glow plug according to claim 1,
caractérisée en ce qu' characterized in that
un organe de centrage (6) est positionné à la jonction du fil de connexion (4) et de l'électrode (5) dans le corps (1 , 2) de la bougie de préchauffage. a centering member (6) is positioned at the junction of the connecting wire (4) and the electrode (5) in the body (1, 2) of the glow plug.
3°) Bougie de préchauffage selon la revendication 1 , 3 °) Glow plug according to claim 1,
caractérisée par characterized by
un organe de blocage de l'électrode (5) par rapport au corps tubulaire (1) comprenant : a blocking member of the electrode (5) with respect to the tubular body (1) comprising:
- une surface d'accrochage (53) constituée par une déformation locale de la surface de l'électrode (5), - un manchon isolant (7) engagé dans la surface d'accrochage (53),an attachment surface (53) constituted by a local deformation of the surface of the electrode (5), an insulating sleeve (7) engaged in the hooking surface (53),
- un sertissage (14) du corps tubulaire (1) comprimant le manchon (7) dans la déformation locale de la surface d'accrochage (53) de l'électrode (5) pour solidariser mécaniquement le point de sertissage (14) du corps tubulaire (1) à la surface d'accrochage (53) de l'électrode (5). - a crimping (14) of the tubular body (1) compressing the sleeve (7) in the local deformation of the attachment surface (53) of the electrode (5) to mechanically fasten the crimping point (14) of the body tubular (1) to the attachment surface (53) of the electrode (5).
4°) Bougie de préchauffage selon la revendication 1 , 4 °) Glow plug according to claim 1,
caractérisée en ce que characterized in that
le segment en surlongueur (42) du fil de connexion (4) a une forme choisie dans le groupe comprenant : the overly long segment (42) of the lead wire (4) has a shape selected from the group consisting of:
- une forme en S dans le plan, une forme en Z dans le plan, une forme en S tridimensionnelle, une forme en Z tridimensionnelle,  an S-shape in the plane, a Z-shape in the plane, a three-dimensional S shape, a three-dimensional Z shape,
- une forme de spire(s). 5°) Bougie de préchauffage selon la revendication 1 ,  - a form of turn (s). 5 °) Glow plug according to claim 1,
caractérisée en ce que characterized in that
l'organe de centrage (6) est une pièce cylindrique de révolution, traversée par un perçage axial (61) pour le passage de l'extrémité arrière (43) du fil de connexion (4) et une cavité arrière (62) recevant l'extrémité avant (51) de l'électrode (5), et the centering member (6) is a cylindrical piece of revolution, traversed by an axial bore (61) for the passage of the rear end (43) of the connection wire (4) and a rear cavity (62) receiving the front end (51) of the electrode (5), and
- l'ouverture de l'enveloppe (21) du crayon chauffant (2) comporte un la- mage (25) pour recevoir en butée à l'organe de centrage (6).  - The opening of the casing (21) of the heating rod (2) comprises a lamage (25) for receiving in abutment with the centering member (6).
6°) Bougie de préchauffage selon la revendication 1 , 6 °) Glow plug according to claim 1,
caractérisée en ce que characterized in that
l'extrémité arrière (43) du fil de connexion (4) est reliée à l'extrémité avant (51) de l'électrode (5) par une soudure (55) ou un sertissage (56). the rear end (43) of the connecting wire (4) is connected to the front end (51) of the electrode (5) by a soldering (55) or crimping (56).
7°) Bougie de préchauffage selon la revendication 6, 7 °) Glow plug according to Claim 6,
caractérisée en ce que characterized in that
l'extrémité (51) de l'électrode (5) comporte un logement axial (52) recevant l'extrémité (43) du fil de connexion (4) bloquée dans le logement axial (52) par une soudure (55) à travers la paroi de l'extrémité (51) ou par sertissage (56) de l'extrémité (51) sur l'extrémité arrière (42) du fil de connexion. the end (51) of the electrode (5) has an axial housing (52) receiving the end (43) of the connection wire (4) locked in the axial housing (52) by a weld (55) across the wall of the end (51) or crimping (56) of the end (51) on the rear end (42) of the connecting wire.
8°) Bougie de préchauffage selon la revendication 1 , 8 °) Glow plug according to Claim 1,
caractérisée en ce que l'extrémité arrière (15) du corps tubulaire métallique (1) comporte un logement axial ( 17) recevant la surface externe (81) du manchon isolant (8). characterized in that the rear end (15) of the metal tubular body (1) has an axial housing (17) receiving the outer surface (81) of the insulating sleeve (8).
9°) Bougie de préchauffage selon la revendication 1 , 9 °) Glow plug according to claim 1,
caractérisée en ce que characterized in that
la surface interne (82) du manchon isolant (8) reçoit le manchon (31) de l'embout de connexion (3) the inner surface (82) of the insulating sleeve (8) receives the sleeve (31) of the connecting piece (3)
10°) Bougie de préchauffage selon la revendication 1, 10 °) Glow plug according to claim 1,
caractérisée en ce que characterized in that
l'extrémité arrière (54) de l'électrode (5) est moletée et l'embout de connexion (3) comporte un logement cylindrique (31) recevant l'extrémité (54) de l'électrode pour être sertie (34) sur le moletage. 1 1°) Procédé de réalisation d'une bougie de préchauffage selon l'une quelconque des revendications 1 à 10, the rear end (54) of the electrode (5) is knurled and the connecting end (3) has a cylindrical housing (31) receiving the end (54) of the electrode to be crimped (34) on knurling. 1 1 °) A method of producing a glow plug according to any one of claims 1 to 10,
caractérisé en ce qu' characterized in that
- on assemble le fil de connexion (4) à la cartouche chauffante (22) par brasure et on installe la cartouche dans l'enveloppe (21) en la fixant par une brasure assurant également le contact électrique entre le filament chauffant et l'enveloppe (21),  - The connection wire (4) is assembled to the heating cartridge (22) by brazing and the cartridge is installed in the casing (21) by fixing it by a solder also ensuring the electrical contact between the heating filament and the casing. (21)
- simultanément, on engage l'organe de centrage (6) dans l'embase (24) de l'enveloppe et on enfile l'extrémité arrière (43) du fil de connexion dans le perçage (61) de l'organe de centrage,  - At the same time, the centering member (6) is engaged in the base (24) of the casing and the rear end (43) of the connection wire is inserted into the hole (61) of the centering member. ,
- on assemble l'électrode (5) à l'extrémité arrière (43) du fil de connexion (4), the electrode (5) is assembled at the rear end (43) of the connection wire (4),
- on met en place le manchon (7) sur le moletage (53) de l'électrode (5) et on met en place le corps tubulaire (1) en le fixant à l'embase épaisse (64) par une soudure (16) puis, on bloque l'électrode (5) par le sertis- sage (14) sur le moletage (53) de l'électrode (5) avec interposition du manchon isolant (7),  the sleeve (7) is placed on the knurling (53) of the electrode (5) and the tubular body (1) is put in place by fixing it to the thick base (64) by a weld (16). ) then the electrode (5) is locked by the crimping (14) on the knurling (53) of the electrode (5) with the insertion of the insulating sleeve (7),
- on installe le manchon isolant (8) dans le lamage (17) de la zone arrière (12) du corps tubulaire (1), et  installing the insulating sleeve (8) in the countersink (17) of the rear zone (12) of the tubular body (1), and
- on emmanche de force le manchon (31) de l'embout de connexion (1) avec interposition du manchon isolant (8) et on sertit (34) l'ensemble embout (3) /électrode (5).  the sleeve (31) of the connection piece (1) is force-fitted by means of the insertion of the insulating sleeve (8) and the end piece (3) / electrode (5) is crimped (34).
EP13802571.3A 2012-12-04 2013-12-03 Diesel engine heater plug Withdrawn EP2929249A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1261602A FR2998949B1 (en) 2012-12-04 2012-12-04 DIESEL ENGINE PREHEATING CANDLE
PCT/EP2013/075427 WO2014086798A1 (en) 2012-12-04 2013-12-03 Diesel engine heater plug

Publications (1)

Publication Number Publication Date
EP2929249A1 true EP2929249A1 (en) 2015-10-14

Family

ID=47754728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13802571.3A Withdrawn EP2929249A1 (en) 2012-12-04 2013-12-03 Diesel engine heater plug

Country Status (4)

Country Link
EP (1) EP2929249A1 (en)
JP (1) JP6075921B2 (en)
FR (1) FR2998949B1 (en)
WO (1) WO2014086798A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3023604B1 (en) * 2014-07-09 2016-07-01 Airbus Helicopters PREHEATING ASSEMBLY, CYLINDER HEAD, PISTON ENGINE AND AIRCRAFT
JP7261650B2 (en) * 2019-04-19 2023-04-20 ボッシュ株式会社 Ceramic heater type glow plug and manufacturing method thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672546A (en) * 1950-06-23 1954-03-16 Edison Inc Thomas A Glow plug for compression-ignition engines
US4725711A (en) * 1984-08-27 1988-02-16 Jidosha Kiki Co., Ltd. Self temperature control type glow plug
JP2001141238A (en) * 1999-09-03 2001-05-25 Bosch Automotive Systems Corp Glow plug for diesel engine and method of manufacturing it
JP2001165440A (en) * 1999-12-08 2001-06-22 Ngk Spark Plug Co Ltd Glow plug and its manufacturing method
JP2001263662A (en) * 2000-03-24 2001-09-26 Bosch Automotive Systems Corp Glow plug for diesel engine
JP2002359060A (en) * 2001-05-31 2002-12-13 Ngk Spark Plug Co Ltd Heater and method of manufacturing heater
JP4175970B2 (en) * 2002-08-12 2008-11-05 日本特殊陶業株式会社 Glow plug
US6900412B2 (en) * 2002-08-12 2005-05-31 Ngk Spark Plug Co., Ltd. Glow plug

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2014086798A1 *

Also Published As

Publication number Publication date
WO2014086798A1 (en) 2014-06-12
FR2998949B1 (en) 2018-09-07
FR2998949A1 (en) 2014-06-06
JP2015535589A (en) 2015-12-14
JP6075921B2 (en) 2017-02-08

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