[go: up one dir, main page]

EP2929251B1 - Glow plug for diesel motor with wire electrode - Google Patents

Glow plug for diesel motor with wire electrode Download PDF

Info

Publication number
EP2929251B1
EP2929251B1 EP13815393.7A EP13815393A EP2929251B1 EP 2929251 B1 EP2929251 B1 EP 2929251B1 EP 13815393 A EP13815393 A EP 13815393A EP 2929251 B1 EP2929251 B1 EP 2929251B1
Authority
EP
European Patent Office
Prior art keywords
terminal
glow plug
wire
tubular body
heating
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.)
Not-in-force
Application number
EP13815393.7A
Other languages
German (de)
French (fr)
Other versions
EP2929251A1 (en
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 EP2929251A1 publication Critical patent/EP2929251A1/en
Application granted granted Critical
Publication of EP2929251B1 publication Critical patent/EP2929251B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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 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 to screw into the cylinder head of the engine and thus 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 with a heating rod for electrical return to ground. All the components are held in position by an insulating powder packed in the protection 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 metal body 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.
  • the object of the present invention is to provide a glow plug with a simple and economical design, which makes it possible to effectively withstand the stresses of expansion and retraction under the effect of the large temperature variations to which the candle is subjected while simplifying the structure and the realization of the glow plug.
  • the embodiment of the glow plug according to the invention greatly simplifies machining and assembly thanks to the extensible wire electrode and the connection means thereof and also thanks to the suppression of insulating powder and its method of compaction.
  • the assembly is done by simple operations, such as the establishment of components by fitting, laser welding, and other simple operations.
  • the components are also obtained by simple and usual methods: the wire of the electrode is made by a simple drawing process and the centering member is manufactured for example by molding or overmolding under pressure. Overall, the simplification of the assembly avoids difficulties and reduces the cost of production.
  • a lug in the sense of the invention is a lug in the usual sense and general, that is to say a metal liner at the end of an electrical conductor.
  • the compensator connector is in the form of a wire connected to the front lug and to the heating cartridge.
  • This form of compensator connector effectively absorbs variations in length at the junction of the tubular body and the heating rod.
  • the centering and holding element in position is a circular cylindrical plate traversed by an axial bore for the passage of the front lug and a rear cavity receiving the rear end of the electrode, and Opening the envelope of the heating rod comprises a counterbore for receiving in abutment, the centering member.
  • This embodiment is not only simple as such but facilitates the introduction of the conductive path in the glow plug.
  • connection wire is connected to the front end of the wire electrode by welding or crimping.
  • the rear end of the connection wire is thus secured to the wire electrode so that the variable distance that compensates for the over-extended segment 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 on the other hand to the electrode .
  • the glow plug according to a first embodiment consists of a tubular body 1 connected by one end 11 to a heating rod 2, the other end 12 being connected to a connecting piece 3.
  • the glow plug is screwed in the cylinder head of the engine and through the thread 13 of the body 1 and the length of the metal casing 21, the heating rod 2 projects in the combustion chamber to ensure preheating.
  • the connection piece 3 is connected to the electrical circuit board by the preheating control.
  • the heating pencil 2 comprises a heating resistor, connected on one side to the ground by its metal shell 21 which is itself connected electrically to the body 1 which is grounded by its screwing into the cylinder head.
  • the other end of the heating wire of the heating rod 2 is connected to the electrical circuit board by the conductive path through the wire electrode passing through the body 1 and connected to the connection tip 3.
  • the heating rod 2 functions as a heating resistor connected on one side to the ground by support of the cone in the cylinder head of its metal shell itself electrically connected to the body 1 which is also grounded by its screwing into the cylinder head.
  • the other end of the heating rod 2 is connected to the electrical circuit board by the conductive path "+" through the electrode passing through the body 1 and connected to the connection tip 3.
  • the heating rod 2 consists of a metal shell 21 in the form of a finger housing a ceramic heating cartridge 22A incorporating a heating conductor Joule effect.
  • the heating cartridge 22A is connected to a wire-shaped compensator connector 4A having a front end 41A, an intermediate segment 42A and a rear end 43A attached to the front end 51A of an extensible wire electrode 5A housed in the tubular body 1 .
  • the extensible wire electrode 5A is a wire rope insulated by a sheath and longer than the length of the tubular body 1; its front end 51A is provided with a lug 53A for receiving and fixing the rear end 43A of the connecting wire 4A.
  • the extensible wire electrode 5A terminates in a rear end 52A provided with a rear lug 54A for receiving the connecting end 3.
  • the wire electrode 5A has a body 55A between its ends lined with lugs 53A, 54A which has a corrugated form or composed of wide turns to allow the extension of the electrode 5A and sufficiently out the lug 54A of the rear end 12 of the tubular body 1 for assembly of the tip 3.
  • the conductive path feeding the heating cartridge 22A is constituted by the compensator connector in the form of a connecting wire 4A, the wire electrode 5A and the tip 3.
  • the conductive path is electrically insulated with respect to the metal casing 21 of the heating pencil 2 and the tubular body 1 at one end by a centering member 6A receiving the front lug 53A and at the other end by an end insulating sleeve 8.
  • the centering member 6A is a piece of refractory insulating material, in the form of a wafer, integral with the lug 53A by an overmoulding process, through which a bore 61A is inserted to ensure the axial positioning and the centered holding of the lug before 53A connected. at the rear end 43A of the connection wire 4A.
  • the centering member 6A is housed without play in the countersink 25 of the base 24 of the heating rod 2 by being blocked by the front edge of the tubular body 1 after welding.
  • the rear end 52A of the wired electrode 5A is provided with a rear lug 54A to receive the connector 3 which consists of a pin 31 followed by a body 32 with a groove 33, a collar 34 and a pin or connecting tab 35.
  • the tip 3 is fixed to the wire electrode 5A by the lug 54A on the pin 31, with a weld point 36.
  • connection tip 3 is electrically isolated in the rear end 12 of the tubular body 1 with the interposition of an insulating sleeve 8 force-fitted by plastic deformation without play in the groove 33.
  • the crimping of the rear end of the tubular body 1 in the direction of the center of the candle exerts a pressure which immobilizes the insulating sleeve 8, which sleeve 8 immobilizes in turn the connecting end piece 3 thanks to the circular groove 33.
  • the tubular body 1 is externally provided with a thread 13 for screwing it into the heat engine by sealingly pressing against its conical sealing surface 26, its rear end 12 having a tool catch 14, for example made of Hexagon nut shape for screwing / unscrewing the glow plug into the motor.
  • the metal casing 2 ensures centering and sealing between the candle and the combustion chamber thanks to its cone 26.
  • the tubular body 1 is welded to the metal casing 21 of the heating rod 2 by the weld 15.
  • the segment 42A of the connecting wire 4A is a segment in excess of length relative to two reference points of the glow plug, for example the length (L) taken between its solder at the lug 53A and the rear end of the cartridge 22A. this length being 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 42A 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 stress on the solder assembly of the connection sleeve 41A of the connection wire 4A and the rear end of the heating element 22A so as not to damage the electrical connection.
  • This excess length is easily calculated from the geometrical data of the glow plug and the coefficients of thermal expansion of the materials constituting the glow plug
  • the segment 42A of excess length of the connector 4A ensures 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 which surround and hold 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 socket.
  • These expansions and very strong and very fast retractions are due to the variations of the extreme temperatures that the glow plug undergoes in the cold start phases and in continuous operation of the engine.
  • the segment 42a extra length allows to collect not only the axial length variations but also the radial stresses due to misalignment between the heating rod 2, the connection wire 4A and the centering member 6A of the electrode wired 5A and vibrations induced in the glow plug by the operation of the engine.
  • the excess length of the segment 42A is made in practice 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 that 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 lug 53A at the front end 51A of the wire electrode 5A bears axially in the bore 61A of the centering member 6A itself in axial support at the bottom of the countersink 25 of the envelope 21.
  • the lug 53A at the front end 51A of the wire electrode 5A is permanently secured to the centering member 6A through an overmolding process which makes the two elements inchtmontables.
  • the figure 2 shows another embodiment of the glow plug according to the invention which differs from the first embodiment by the shape of the wire electrode and its connection with the heating cartridge. Under these conditions, the description of the common parts will not be systematically repeated and the components similar to those of the first embodiment carry the same reference numeral with the suffix "B" instead of the suffix "A".
  • the heating pencil 2 consists of a metal shell 21 in the form of a finger housing a ceramic heating cartridge 22B incorporating a heating conductor Joule effect.
  • the thin metal casing 21 terminates in a thick base 24 forming a conical sealing surface 26 and provided with a countersink 25 beyond the free volume 23 remaining in the casing 21 behind the heating cartridge 22B.
  • the heating cartridge 22B is connected by its connecting head 26B to the front end 51B of an extensible wire electrode 5B housed in the tubular body 1.
  • the wire electrode 5B is a cable insulated by a sheath occupying the entire length of the body tubular 1 and whose front end 51B provided with a pod before 53B.
  • the cable forming the wire electrode 5B has a body 55B of corrugated shape or with turns to allow, as in the previous example, the extension of the wire electrode 5B and sufficiently lift the lug 54B from the rear end 12 of the tubular body 1 for assembling the tip 3.
  • a bushing-shaped compensator connector 4B 41B with a bottom 42B is connected to the front lug 53B or is integral therewith.
  • the sleeve 41B is engaged in an insulating sleeve 6B having a side wall 61B and a bottom 62B retaining the sleeve 41B rearwardly.
  • the bottom 62B is crossed by the pod before 53B.
  • the side wall 61B of the insulating sleeve 6B has an edge 63B for coming into the countersink 25 of the base 24 of the heating rod 2 and to be blocked by the tubular body 1.
  • the outer diameter of the bead 63B ( Fig. 4 ) is greater than the inside diameter of the tubular body 1 and the outside diameter is such that the side wall 61B of the insulating sleeve 6B is housed without play in the tubular body 1.
  • the rear end of the heating cartridge 22B carries a connection head 27B connected to the heating conductor integrated in the heating cartridge 22B further connected to the front, to the metal casing 21 (not shown) for the contact of the mass.
  • the sleeve 41B is fitted on the head 27B for the electrical connection.
  • the conductive path feeding the heating cartridge 22B, constituted by the socket 41B, the wire electrode 5B and the tip 3 is positioned in an electrically insulated manner with respect to the tubular body 1 and the thick base 24 at one end by the insulating sleeve centering 6B and at the rear end by an insulating sleeve 8; the connecting piece 3 is electrically isolated in the rear end 12 of the tubular body 1 with the insertion of the 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 comprises a tool socket 15, for example in the form of hexagon nut by the screwing / unscrewing of the glow plug in the engine.
  • the tubular body 1 is assembled with the heating rod 2 by the weld 16 with the thick base 24 thus retaining the centering member 6B.
  • the wired electrode 5A, B consists of an electrically conductive core that transmits electrical energy and an insulating envelope.
  • the length by extension of the wire electrode 5A, B thus allows the assembly of the front end 51B of the electrode and setting up the tubular body 1 and its attachment by the weld 15, to draw the wire electrode 5B to lengthen it and remove the lug 54B and fix it to the pin 36 of the connecting piece 3 and then block the connection by a spot of welding.
  • the connector 4B ensures by the sleeve 41B both the damping of the expansions / retractions which correspond to strong variations in the axial length of the various components of the candle, due to the movements of expansion and retraction of these components which surround and maintain in position the elements of the inner 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 or at standstill.
  • the sleeve 41B makes it possible to collect not only the axial length variations but also the radial stresses. due to misalignment between the heating rod 2 and the wire electrode 5B and the vibrations induced in the glow plug by the operation of the motor.
  • the bottom of the sleeve 41B serves as an axial abutment against the bottom 62B of the centering member 6B, itself immobilized by the front 11 of the tubular body 1, this guaranteeing the connection with the connection head 27B of the heating cartridge 2.
  • the figure 3 shows the conductive path formed by the first wired electrode variant 5A and the figure 4 shows the conductive path formed by the second wired electrode variant 5B.
  • the front lug 53A is welded or crimped on the rear end 43A of the connecting wire 4A.
  • the front lug 53A is welded to the rear end 43A of the connecting wire 4A.
  • the figure 7 shows the detail of the positioning of the front lug 53B and the connecting sleeve 41B surrounded by the insulating sleeve 6B itself attached to the junction of the metal casing 21 of the heating rod 2 and the front end 11 of the tubular body 1 .
  • the figure 8A shows the assembly of the insulating sleeve 8 in the counterbore 16 of the tubular body 1, centered by the outer surface 81 and abutted by the bottom 83.
  • the connection endpiece 3 is assembled with the insulating sleeve 8, centered by the surface 32 is abutted by the bottom 37.
  • the deformable material of the insulating sleeve 8 on the body 32 of the connecting piece 3 penetrates into several grooves or on a knurled surface of the body 32 to ensure the axial immobilization backwards.
  • the compressions obtained by assembling the connecting piece 3, the insulating sleeve 8 and the tubular body 1 ensure the sealing of the rear zone of the glow plug.
  • the crimping of the edge 17 of the rear end of the tubular body 1 on the insulating sleeve 8 ensures the immobilization of the insulation sleeve 8 and the connection piece 3.
  • the Figure 8B shows a variant of the connector 3.

Landscapes

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

Description

Domaine de l'inventionField of the invention

La présente invention se rapporte à une bougie de préchauffage de moteur Diesel comprenant :

  • un corps tubulaire métallique dont une extrémité est terminée par un crayon chauffant, l'autre extrémité porte un embout de connexion,
  • le crayon chauffant logeant le filament chauffant intégré dans une cartouche chauffante,
  • 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.
The present invention relates to a diesel engine glow plug comprising:
  • a metal tubular body, one end of which is terminated by a heating rod, the other end carrying a connecting end,
  • the heating pencil housing the heating filament integrated in a heating cartridge,
  • an electrode integrally traversing the tubular body 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 techniqueState 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 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 to screw into the cylinder head of the engine and thus 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 à du crayon chauffant pour le retour électrique à la masse. L'ensemble des composants est maintenu en position par une poudre isolante tassée 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 corps métallique par la poudre isolante compactée et le joint d'étanchéité.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 with a heating rod for electrical return to ground. All the components are held in position by an insulating powder packed in the protection 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 metal body by the compacted insulating powder and the seal.

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.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.

Les documents JP411072229A et US4563568 sont considérés comme pertinents par rapport à l'objet de l'invention.The documents JP411072229A and US4563568 are considered relevant to the object of the invention.

But de l'inventionPurpose of the invention

La présente invention a pour but de réaliser une bougie de préchauffage de conception simple et économique, 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.The object of the present invention is to provide a glow plug with a simple and economical design, which makes it possible to effectively withstand the stresses of expansion and retraction under the effect of the large temperature variations to which the candle is subjected while simplifying the structure and the realization of the glow plug.

Exposé et avantages de l'inventionDescription 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 :

  • une électrode filaire terminée à chaque extrémité par une cosse dont l'une est reliée à la cartouche chauffante en étant entourée d'un organe de centrage isolant calé à la jonction de l'enveloppe du crayon chauffant et de l'extrémité avant du corps tubulaire et l'autre cosse est fixée en position centrée sur la broche de l'embout de connexion lui-même engagé dans l'extrémité arrière du corps tubulaire, et
  • un connecteur compensateur reliant la cosse avant de l'électrode filaire à la cartouche chauffante.
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:
  • a wire electrode terminated at each end by a lug, one of which is connected to the heating cartridge being surrounded by an insulating centering member wedged at the junction of the heating rod casing and the front end of the tubular body and the other lug is fixed in a centered position on the pin of the connector end itself engaged in the rear end of the tubular body, and
  • a compensator connector connecting the front lug of the wired electrode to the heating cartridge.

La réalisation de la bougie de préchauffage selon l'invention simplifie considérablement l'usinage et l'assemblage grâce à l'électrode filaire extensible et aux moyens de raccordement de celle-ci et aussi grâce à la suppression de poudre isolante et de son procédé de compactage. L'assemblage se fait par des opérations simples, telles que la mise en place des constituants par emmanchement, des soudures au laser, et autres opérations simples. Les composants sont également obtenus par des procédés simples et usuels : le fil métallique de l'électrode est réalisé par un procédé simple de tréfilage et l'organe de centrage se fabrique par exemple par moulage ou surmoulage sous pression. Globalement, la simplification de l'assemblage évite des difficultés et réduit le coût de production.The embodiment of the glow plug according to the invention greatly simplifies machining and assembly thanks to the extensible wire electrode and the connection means thereof and also thanks to the suppression of insulating powder and its method of compaction. The assembly is done by simple operations, such as the establishment of components by fitting, laser welding, and other simple operations. The components are also obtained by simple and usual methods: the wire of the electrode is made by a simple drawing process and the centering member is manufactured for example by molding or overmolding under pressure. Overall, the simplification of the assembly avoids difficulties and reduces the cost of production.

Une cosse au sens de l'invention est une cosse au sens usuel et général, c'est-à-dire une garniture métallique à l'extrémité d'un conducteur électrique.A lug in the sense of the invention is a lug in the usual sense and general, that is to say a metal liner at the end of an electrical conductor.

Selon une autre caractéristique, le connecteur compensateur est en forme de fil relié à la cosse avant et à la cartouche chauffante.According to another characteristic, the compensator connector is in the form of a wire connected to the front lug and to the heating cartridge.

Cette forme de connecteur de compensateur permet d'absorber efficacement les variations de longueur à la jonction du corps tubulaire et du crayon chauffant.This form of compensator connector effectively absorbs variations in length at the junction of the tubular body and the heating rod.

Suivant une autre caractéristique avantageuse,

  • le connecteur compensateur en forme de fil est relié à l'électrode filaire par une liaison solidaire bloquant l'extrémité arrière du fil de connexion à la cosse avant de l'électrode filaire,
  • le fil de connexion a un segment intermédiaire entre son segment avant fixé à la cartouche chauffante et son segment arrière fixé à la cosse avant, ce segment intermédiaire étant en surlongueur par rapport à la longueur entre les points de fixation du fil de connexion à la cartouche chauffante et l'électrode filaire 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, et
  • un organe de centrage positionné à la jonction du connecteur, et de la cosse de l'électrode filaire dans le corps de la bougie de préchauffage.
According to another advantageous characteristic,
  • the wire-shaped compensating connector is connected to the wire electrode by a fixed connection blocking the rear end of the connection wire to the front terminal of the wire electrode,
  • the connecting wire has an intermediate segment between its front segment fixed to the heating cartridge and its rear segment fixed to the front lug, this intermediate segment being in excess of the length between the attachment points of the connection wire to the cartridge heating and the wired 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, and
  • a centering member positioned at the junction of the connector, and the lug of the wire electrode in the body of the glow plug.

Dans ce contexte d'une manière particulièrement avantageuse, le segment en surlongueur du fil de connexion a une forme choisie dans le groupe comprenant :

  • une forme en S dans le plan, une forme en Z dans le plan, une forme en S tridimensionnelle, une forme en Z tridimensionnelle,
  • une forme de spire(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.
In this context, in a particularly advantageous manner, the segment in excess of the connection wire has a shape chosen from the group comprising:
  • an S-shape in the plane, a Z-shape in the plane, a three-dimensional S shape, a three-dimensional Z shape,
  • a form of turn (s). 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 et de maintien en position est une plaquette cylindrique circulaire, traversée par un perçage axial pour le passage de la cosse avant et une cavité arrière recevant l'extrémité arrière de l'électrode, et l'ouverture de l'enveloppe du crayon chauffant comporte un lamage pour recevoir en butée, l'organe de centrage. Cette forme de réalisation est non seulement simple en tant que telle mais facilite la mise en place du chemin conducteur dans la bougie de préchauffage.According to another advantageous characteristic, the centering and holding element in position is a circular cylindrical plate traversed by an axial bore for the passage of the front lug and a rear cavity receiving the rear end of the electrode, and Opening the envelope of the heating rod comprises a counterbore for receiving in abutment, the centering member. This embodiment is not only simple as such but facilitates the introduction of the conductive path in the glow plug.

Suivant une autre caractéristique avantageuse, l'extrémité arrière du fil de connexion est reliée à l'extrémité avant de l'électrode filaire par une soudure ou un sertissage. L'extrémité arrière du fil de connexion est ainsi solidarisée à l'électrode filaire 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.According to another advantageous characteristic, the rear end of the connection wire is connected to the front end of the wire electrode by welding or crimping. The rear end of the connection wire is thus secured to the wire electrode so that the variable distance that compensates for the over-extended segment 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 on the other hand to the electrode .

Suivant une autre caractéristique avantageuse,

  • la cosse avant de l'élément filaire est reliée à un connecteur compensateur formé d'une douille conductrice reliée par la cosse à l'extrémité avant de l'électrode filaire, cette douille conductrice étant logée dans un organe de centrage en forme de manchon isolant, et
  • l'extrémité de la cartouche chauffante comporte une tête conductrice, reliée à une extrémité de son filament chauffant et se logeant par emmanchement dans la douille du connecteur. Cette forme de réalisation de la jonction entre l'électrode et la cartouche chauffante permet d'absorber efficacement les variations de longueur liées aux dilatations et rétractions à cet endroit de la bougie de préchauffage.
According to another advantageous characteristic,
  • the front terminal of the wire element is connected to a compensator connector formed of a conductive sleeve connected by the terminal to the front end of the wire electrode, this conductive sleeve being housed in a centering member in the form of an insulating sleeve , and
  • the end of the heating cartridge comprises a conductive head, connected to one end of its heating filament and accommodating by fitting into the socket of the connector. This embodiment of the junction between the electrode and the heating cartridge effectively absorbs the length variations associated with the expansions and retractions at this location of the glow plug.

L'invention se rapporte également à un procédé de réalisation d'une bougie de préchauffage telle que définie ci-dessus, comprenant les étapes suivantes :

  • on réalise les différents composants,
  • on assemble la cartouche chauffante à l'enveloppe métallique par une brasure assurant également la liaison électrique de la masse,
  • on fixe le connecteur compensateur ou en utilisant la tête de connexion déjà fixée à l'extrémité de la cartouche chauffante, on assemble l'extrémité avant munie d'une cosse au fil de connexion ou au connecteur formé d'une douille engagée sur la tête conductrice,
  • on met en place le corps tubulaire et on le soude par une soudure à l'embase de l'enveloppe métallique puis on tire sur la cosse de l'extrémité arrière de l'électrode filaire pour faire sortir la cosse de l'extrémité arrière du corps tubulaire suffisamment pour la relier à la broche de l'embout puis souder la cosse à la broche, et
  • on emmanche de force le corps de l'embout dans le manchon isolant lui-même engagé dans le lamage de l'extrémité arrière du corps tubulaire.
The invention also relates to a method for producing a glow plug as defined above, comprising the following steps:
  • we realize the different components,
  • the heating cartridge is assembled to the metal casing by a solder which also ensures the electrical connection of the mass,
  • the compensating connector is fixed or by using the connection head already attached to the end of the heating cartridge, the front end provided with a terminal is assembled to the connection wire or to the connector formed by a socket engaged on the head. conductive,
  • the tubular body is put in place and welded by a weld to the base of the metal casing, and then the lug is pulled from the rear end of the wire electrode to pull the lug out of the rear end of the metal casing. tubular body sufficiently to connect it to the spindle of the mouthpiece then solder the lug to the spindle, and
  • the body of the endpiece is force-fitted into the insulating sleeve itself engaged in the countersink of the rear end of the tubular body.

Dessinsdrawings

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 :

  • la figure 1 est une coupe axiale d'un premier mode de réalisation de la bougie de préchauffage,
  • la figure 2 est une vue en coupe axiale d'un second mode de réalisation de la bougie de préchauffage,
  • la figure 3 montre le premier mode de réalisation de l'électrode filaire,
  • la figure 4 montre le second mode de réalisation de l'électrode filaire,
  • la figure 5A est un détail montrant l'assemblage de la cosse avant et de l'extrémité arrière du fil de connexion,
  • la figure 5B montre une variante d'assemblage de la cosse avant, et de l'extrémité arrière d'un fil de connexion,
  • les figures 6A, 6B montrent selon deux vues en coupe, la fixation par soudage à plat de l'extrémité de la cosse avant et de l'extrémité arrière du fil de connexion,
  • la figure 7 est une vue de détail de la zone d'assemblage et de jonction de la cartouche chauffante et de l'extrémité avant de l'électrode filaire,
  • la figure 8A montre l'assemblage du manchon isolant dans l'extrémité arrière du corps filaire, de l'embout de connexion dans le manchon d'isolation et du sertissage du corps tubulaire sur le manchon de connexion,
  • la figure 8B montre une variante d'embout de connexion.
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:
  • the figure 1 is an axial section of a first embodiment of the glow plug,
  • the figure 2 is an axial sectional view of a second embodiment of the glow plug,
  • the figure 3 shows the first embodiment of the wire electrode,
  • the figure 4 shows the second embodiment of the wire electrode,
  • the Figure 5A is a detail showing the assembly of the front terminal and the rear end of the connection wire,
  • the Figure 5B shows an assembly variant of the front terminal and the rear end of a connection wire,
  • the Figures 6A, 6B show in two sectional views, fixing by flat welding of the end of the front lug and the rear end of the connecting wire,
  • the figure 7 is a detailed view of the assembly and joining zone of the heating cartridge and the front end of the wire electrode,
  • the figure 8A shows the assembly of the insulating sleeve in the rear end of the wire body, the connection end in the insulating sleeve and the crimping of the tubular body on the connection sleeve,
  • the Figure 8B shows a connection tip variant.

Description de modes de réalisation de l'inventionDescription 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 selon un premier mode de réalisation se compose d'un corps tubulaire 1 relié par une extrémité 11 à un crayon chauffant 2, l'autre extrémité 12 étant reliée à un embout de connexion 3. La bougie de préchauffage se visse dans la culasse du moteur et grâce au filetage 13 du corps 1 et à la longueur de l'enveloppe métallique 21, 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 par la commande de préchauffage. Il s'agit de moyens connus en général qui ne nécessitent ni description détaillée ni représentation particulière.According to figure 1 , the glow plug according to a first embodiment consists of a tubular body 1 connected by one end 11 to a heating rod 2, the other end 12 being connected to a connecting piece 3. The glow plug is screwed in the cylinder head of the engine and through the thread 13 of the body 1 and the length of the metal casing 21, the heating rod 2 projects in the combustion chamber to ensure preheating. The connection piece 3 is connected to the electrical circuit board by the preheating control. These are generally known means that do not require detailed description or particular representation.

Le crayon chauffant 2 comporte une résistance chauffante, reliée d'un côté à la masse par son enveloppe métallique 21 elle-même reliée électriquement au corps 1 qui est à la masse par son vissage dans la culasse. L'autre extrémité du fil chauffant du crayon chauffant 2 est reliée au circuit électrique de bord par le chemin conducteur à travers l'électrode filaire passant dans le corps 1 et reliée à l'embout de connexion 3.The heating pencil 2 comprises a heating resistor, connected on one side to the ground by its metal shell 21 which is itself connected electrically to the body 1 which is grounded by its screwing into the cylinder head. The other end of the heating wire of the heating rod 2 is connected to the electrical circuit board by the conductive path through the wire electrode passing through the body 1 and connected to the connection tip 3.

Le crayon chauffant 2 fonctionne comme une résistance chauffante reliée d'un côté à la masse par appui du cône dans la culasse de son enveloppe métallique elle-même reliée électriquement au corps 1 qui est aussi à la masse par son vissage dans la culasse. L'autre extrémité du crayon chauffant 2 est reliée au circuit électrique de bord par le chemin conducteur « + » à travers l'électrode passant dans le corps 1 et reliée à l'embout de connexion 3.The heating rod 2 functions as a heating resistor connected on one side to the ground by support of the cone in the cylinder head of its metal shell itself electrically connected to the body 1 which is also grounded by its screwing into the cylinder head. The other end of the heating rod 2 is connected to the electrical circuit board by the conductive path "+" through the electrode passing through the body 1 and connected to the connection tip 3.

De façon plus détaillée, le crayon chauffant 2 se compose d'une enveloppe métallique 21 en forme de doigt logeant une cartouche chauffante 22A en céramique intégrant un conducteur chauffant par effet Joule. L'enveloppe métallique 21, mince au niveau de la cartouche chauffante 22A se termine par une embase épaisse 24 formant une surface conique 26 d'étanchéité et munie d'un lamage 25 au-delà du volume libre 23 subsistant dans l'enveloppe 21 derrière la cartouche chauffante 22AIn more detail, the heating rod 2 consists of a metal shell 21 in the form of a finger housing a ceramic heating cartridge 22A incorporating a heating conductor Joule effect. The metal casing 21, thin at the level of the heating cartridge 22A, terminates in a thick base 24 forming a conical sealing surface 26 and provided with a countersink 25 beyond the free volume 23 remaining in the envelope 21 behind. the heating cartridge 22A

La cartouche chauffante 22A est reliée à un connecteur compensateur en forme de fil 4A ayant une extrémité avant 41A, un segment intermédiaire 42A et une extrémité arrière 43A fixée à l'extrémité avant 51A d'une électrode filaire extensible 5A logée dans le corps tubulaire 1.The heating cartridge 22A is connected to a wire-shaped compensator connector 4A having a front end 41A, an intermediate segment 42A and a rear end 43A attached to the front end 51A of an extensible wire electrode 5A housed in the tubular body 1 .

L'électrode filaire extensible 5A est un câble métallique isolé par une gaine et de longueur supérieure à la longueur du corps tubulaire 1 ; son extrémité avant 51A est munie d'une cosse 53A pour recevoir et fixer l'extrémité arrière 43A du fil de connexion 4A. L'électrode filaire extensible 5A se termine par une extrémité arrière 52A munie d'une cosse arrière 54A pour recevoir l'embout de connexion 3. L'électrode filaire 5A a un corps 55A entre ses extrémités garnies de cosses 53A, 54A qui a une forme ondulée ou composée de spires larges pour permettre l'extension de l'électrode 5A et faire sortir suffisamment la cosse 54A de l'extrémité arrière 12 du corps tubulaire 1 pour l'assemblage de l'embout 3.The extensible wire electrode 5A is a wire rope insulated by a sheath and longer than the length of the tubular body 1; its front end 51A is provided with a lug 53A for receiving and fixing the rear end 43A of the connecting wire 4A. The extensible wire electrode 5A terminates in a rear end 52A provided with a rear lug 54A for receiving the connecting end 3. The wire electrode 5A has a body 55A between its ends lined with lugs 53A, 54A which has a corrugated form or composed of wide turns to allow the extension of the electrode 5A and sufficiently out the lug 54A of the rear end 12 of the tubular body 1 for assembly of the tip 3.

Le chemin conducteur alimentant la cartouche chauffante 22A est constitué par le connecteur compensateur en forme de fil de connexion 4A, l'électrode filaire 5A et l'embout 3. Le chemin conducteur est positionné de manière isolée 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 6A recevant la cosse avant 53A et à l'autre extrémité par un manchon isolant d'extrémité 8.The conductive path feeding the heating cartridge 22A is constituted by the compensator connector in the form of a connecting wire 4A, the wire electrode 5A and the tip 3. The conductive path is electrically insulated with respect to the metal casing 21 of the heating pencil 2 and the tubular body 1 at one end by a centering member 6A receiving the front lug 53A and at the other end by an end insulating sleeve 8.

L'organe de centrage 6A est une pièce en matière isolante réfractaire, en forme de plaquette, solidaire de la cosse 53A par un procédé de surmoulage, traversée par un perçage 61A pour assurer le positionnement axial et la tenue centrée de la cosse avant 53A reliée à l'extrémité arrière 43A du fil de connexion 4A. L'organe de centrage 6A est logé sans jeu dans le lamage 25 de l'embase 24 du crayon chauffant 2 en y étant bloqué par le bord avant du corps tubulaire 1 après soudage.The centering member 6A is a piece of refractory insulating material, in the form of a wafer, integral with the lug 53A by an overmoulding process, through which a bore 61A is inserted to ensure the axial positioning and the centered holding of the lug before 53A connected. at the rear end 43A of the connection wire 4A. The centering member 6A is housed without play in the countersink 25 of the base 24 of the heating rod 2 by being blocked by the front edge of the tubular body 1 after welding.

L'extrémité arrière 52A de l'électrode filaire 5A est munie d'une cosse arrière 54A pour recevoir l'embout de connexion 3 qui se compose d'une broche 31 suivie d'un corps 32 avec une gorge 33, d'une collerette 34 et d'une broche ou patte de connexion 35. L'embout 3 est fixé à l'électrode filaire 5A par la cosse 54A sur la broche 31, avec un point de soudure 36.The rear end 52A of the wired electrode 5A is provided with a rear lug 54A to receive the connector 3 which consists of a pin 31 followed by a body 32 with a groove 33, a collar 34 and a pin or connecting tab 35. The tip 3 is fixed to the wire electrode 5A by the lug 54A on the pin 31, with a weld point 36.

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 emmanché de force par déformation plastique sans jeu dans la gorge 33. Le sertissage de l'extrémité arrière du corps tubulaire 1 en direction du centre de la bougie exerce une pression qui immobilise le manchon isolant 8, lequel manchon 8 immobilise à son tour l'embout de connexion 3 grâce à la rainure circulaire 33.The connection tip 3 is electrically isolated in the rear end 12 of the tubular body 1 with the interposition of an insulating sleeve 8 force-fitted by plastic deformation without play in the groove 33. The crimping of the rear end of the tubular body 1 in the direction of the center of the candle exerts a pressure which immobilizes the insulating sleeve 8, which sleeve 8 immobilizes in turn the connecting end piece 3 thanks to the circular groove 33.

Le corps tubulaire 1 est muni extérieurement d'un filetage 13 pour son vissage dans le moteur thermique en s'appuyant de manière étanche par sa surface conique d'étanchéité 26, son extrémité arrière 12 comportant une prise d'outil 14, 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 screwing it into the heat engine by sealingly pressing against its conical sealing surface 26, its rear end 12 having a tool catch 14, for example made of Hexagon nut shape for screwing / unscrewing the glow plug into the motor.

L'enveloppe métallique 2 assure centrage et étanchéité entre la bougie et la chambre de combustion grâce à son cône 26.The metal casing 2 ensures centering and sealing between the candle and the combustion chamber thanks to its cone 26.

Le corps tubulaire 1 est soudé à l'enveloppe métallique 21 du crayon chauffant 2 par la soudure 15.The tubular body 1 is welded to the metal casing 21 of the heating rod 2 by the weld 15.

Le segment 42A du fil de connexion 4A est un segment en surlongueur par rapport à deux points de référence de la bougie de préchauffage, par exemple la longueur (L) prise entre sa soudure à la cosse 53A et l'extrémité arrière de la cartouche 22A, cette longueur 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 42A of the connecting wire 4A is a segment in excess of length relative to two reference points of the glow plug, for example the length (L) taken between its solder at the lug 53A and the rear end of the cartridge 22A. this length being 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 42A 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 sur la brasure d'assemblage de la douille de connexion 41A du fil de connexion 4A et l'extrémité arrière de l'élément chauffant 22A afin de ne pas détériorer la connexion électrique. 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 préchauffageThe segment in excess of length 42A 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 stress on the solder assembly of the connection sleeve 41A of the connection wire 4A and the rear end of the heating element 22A so as not to damage the electrical connection. This excess length is easily calculated from the geometrical data of the glow plug and the coefficients of thermal expansion of the materials constituting the glow plug

Plus précisément, le segment en surlongueur 42A du connecteur 4A 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 la liaison entre l'extrémité de l'élément chauffant et la douille de connexion. Ces dilatations et rétractions très fortes et très rapides 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 42A 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 4A et l'organe de centrage 6A de l'électrode filaire 5A et les vibrations induites dans la bougie de préchauffage par le fonctionnement du moteur.More specifically, the segment 42A of excess length of the connector 4A ensures 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 which surround and hold 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 socket. These expansions and very strong and very fast retractions are due to the variations of the extreme temperatures that the glow plug undergoes in the cold start phases and in continuous operation of the engine. The segment 42a extra length allows to collect not only the axial length variations but also the radial stresses due to misalignment between the heating rod 2, the connection wire 4A and the centering member 6A of the electrode wired 5A and vibrations induced in the glow plug by the operation of the engine.

La surlongueur du segment 42A 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.The excess length of the segment 42A is made in practice 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 that 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.

La cosse 53A à l'extrémité avant 51A de l'électrode filaire 5A vient en appui axial dans le perçage 61A de l'organe de centrage 6A lui-même en appui axial au fond du lamage 25 de l'enveloppe 21. La cosse 53A à l'extrémité avant 51A de l'électrode filaire 5A est définitivement solidarisée à l'organe de centrage 6A grâce à un procédé de surmoulage qui rend les deux éléments indémontables.The lug 53A at the front end 51A of the wire electrode 5A bears axially in the bore 61A of the centering member 6A itself in axial support at the bottom of the countersink 25 of the envelope 21. The lug 53A at the front end 51A of the wire electrode 5A is permanently secured to the centering member 6A through an overmolding process which makes the two elements indémontables.

La figure 2 montre un autre mode de réalisation de la bougie de préchauffage selon l'invention qui diffère du premier mode de réalisation par la forme de l'électrode filaire et sa liaison avec la cartouche chauffante. Dans ces conditions, la description des parties communes ne sera pas systématiquement répétée et les composants analogues à ceux du premier mode de réalisation portent la même référence numérique avec le suffixe "B" à la place du suffixe "A".The figure 2 shows another embodiment of the glow plug according to the invention which differs from the first embodiment by the shape of the wire electrode and its connection with the heating cartridge. Under these conditions, the description of the common parts will not be systematically repeated and the components similar to those of the first embodiment carry the same reference numeral with the suffix "B" instead of the suffix "A".

Selon la figure 2, le crayon chauffant 2 se compose d'une enveloppe métallique 21 en forme de doigt logeant une cartouche chauffante 22B en céramique intégrant un conducteur chauffant par effet Joule. Au niveau de la cartouche chauffante 22B, l'enveloppe métallique 21, mince se termine par une embase épaisse 24 formant une surface conique d'étanchéité 26 et munie d'un lamage 25 au-delà du volume libre 23 subsistant dans l'enveloppe 21 derrière la cartouche chauffante 22B.According to figure 2 , the heating pencil 2 consists of a metal shell 21 in the form of a finger housing a ceramic heating cartridge 22B incorporating a heating conductor Joule effect. At the level of the heating cartridge 22B, the thin metal casing 21 terminates in a thick base 24 forming a conical sealing surface 26 and provided with a countersink 25 beyond the free volume 23 remaining in the casing 21 behind the heating cartridge 22B.

La cartouche chauffante 22B est reliée par sa tête de connexion 26B à l'extrémité avant 51B d'une électrode filaire extensible 5B logée dans le corps tubulaire 1. L'électrode filaire 5B est un câble isolé par une gaine occupant toute la longueur du corps tubulaire 1 et dont l'extrémité avant 51B munie d'une cosse avant 53B. Le câble formant l'électrode filaire 5B a un corps 55B de forme ondulée ou avec des spires pour permettre comme dans l'exemple précédent, l'extension de l'électrode filaire 5B et faire sortir suffisamment la cosse 54B de l'extrémité arrière 12 du corps tubulaire 1 pour l'assemblage de l'embout 3.The heating cartridge 22B is connected by its connecting head 26B to the front end 51B of an extensible wire electrode 5B housed in the tubular body 1. The wire electrode 5B is a cable insulated by a sheath occupying the entire length of the body tubular 1 and whose front end 51B provided with a pod before 53B. The cable forming the wire electrode 5B has a body 55B of corrugated shape or with turns to allow, as in the previous example, the extension of the wire electrode 5B and sufficiently lift the lug 54B from the rear end 12 of the tubular body 1 for assembling the tip 3.

Un connecteur compensateur 4B en forme de douille 41B avec un fond 42B est relié à la cosse avant 53B ou fait corps avec celle-ci.A bushing-shaped compensator connector 4B 41B with a bottom 42B is connected to the front lug 53B or is integral therewith.

La douille 41B est engagée dans un manchon isolant 6B ayant une paroi latérale 61B et un fond 62B retenant la douille 41B vers l'arrière. Le fond 62B est traversé par la cosse avant 53B. La paroi latérale 61B du manchon isolant 6B a un bord 63B destiné à venir dans le lamage 25 de l'embase 24 du crayon chauffant 2 et y être bloqué par le corps tubulaire 1. Le diamètre extérieur du bourrelet 63B (Fig. 4) est supérieur au diamètre intérieur du corps tubulaire 1 et le diamètre extérieur est tel que la paroi latérale 61B du manchon isolant 6B est logée sans jeu dans le corps tubulaire 1.The sleeve 41B is engaged in an insulating sleeve 6B having a side wall 61B and a bottom 62B retaining the sleeve 41B rearwardly. The bottom 62B is crossed by the pod before 53B. The side wall 61B of the insulating sleeve 6B has an edge 63B for coming into the countersink 25 of the base 24 of the heating rod 2 and to be blocked by the tubular body 1. The outer diameter of the bead 63B ( Fig. 4 ) is greater than the inside diameter of the tubular body 1 and the outside diameter is such that the side wall 61B of the insulating sleeve 6B is housed without play in the tubular body 1.

L'extrémité arrière de la cartouche chauffante 22B porte une tête de connexion 27B reliée au conducteur chauffant intégré dans la cartouche chauffante 22B par ailleurs relié à l'avant, à l'enveloppe métallique 21 (non représentée) pour le contact de la masse. La douille 41B est emmanchée sur la tête 27B pour le branchement électrique.The rear end of the heating cartridge 22B carries a connection head 27B connected to the heating conductor integrated in the heating cartridge 22B further connected to the front, to the metal casing 21 (not shown) for the contact of the mass. The sleeve 41B is fitted on the head 27B for the electrical connection.

Les autres éléments de cette variante sont identiques à ceux du premier mode de réalisation.The other elements of this variant are identical to those of the first embodiment.

Le chemin conducteur alimentant la cartouche chauffante 22B, constitué par la douille 41B, l'électrode filaire 5B et l'embout 3 est positionné de manière isolé électriquement par rapport au corps tubulaire 1 et l'embase épaisse 24 à une extrémité par le manchon isolant de centrage 6B et à l'extrémité arrière par un manchon isolant 8 ; l'embout de connexion 3 est reçu de manière isolée électriquement dans l'extrémité arrière 12 du corps tubulaire 1 avec interposition du manchon isolant 8.The conductive path feeding the heating cartridge 22B, constituted by the socket 41B, the wire electrode 5B and the tip 3 is positioned in an electrically insulated manner with respect to the tubular body 1 and the thick base 24 at one end by the insulating sleeve centering 6B and at the rear end by an insulating sleeve 8; the connecting piece 3 is electrically isolated in the rear end 12 of the tubular body 1 with the insertion of the 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 comporte une prise d'outil 15, par exemple en forme d'écrou à six pans par 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 comprises a tool socket 15, for example in the form of hexagon nut by the screwing / unscrewing of the glow plug in the engine.

Le corps tubulaire 1 est assemblé au crayon chauffant 2 par la soudure 16 avec l'embase épaisse 24 retenant ainsi l'organe de centrage 6B.The tubular body 1 is assembled with the heating rod 2 by the weld 16 with the thick base 24 thus retaining the centering member 6B.

L'électrode filaire 5A,B est constituée d'une âme électriquement conductrice qui assure la transmission de l'énergie électrique et d'une enveloppe isolante.The wired electrode 5A, B consists of an electrically conductive core that transmits electrical energy and an insulating envelope.

La longueur par extension de l'électrode filaire 5A, B permet ainsi l'assemblage de l'extrémité avant 51B de l'électrode et mise en place du corps tubulaire 1 et sa fixation par la soudure 15, de tirer l'électrode filaire 5B pour l'allonger et sortir la cosse 54B et la fixer à la broche 36 de l'embout de connexion 3 puis bloquer la liaison par un point de soudure.The length by extension of the wire electrode 5A, B thus allows the assembly of the front end 51B of the electrode and setting up the tubular body 1 and its attachment by the weld 15, to draw the wire electrode 5B to lengthen it and remove the lug 54B and fix it to the pin 36 of the connecting piece 3 and then block the connection by a spot of welding.

Le connecteur 4B assure par la douille 41B 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 ou à l'arrêt. La douille 41B 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 et l'électrode filaire 5B et les vibrations induites dans la bougie de préchauffage par le fonctionnement du moteur.The connector 4B ensures by the sleeve 41B both the damping of the expansions / retractions which correspond to strong variations in the axial length of the various components of the candle, due to the movements of expansion and retraction of these components which surround and maintain in position the elements of the inner 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 or at standstill. The sleeve 41B makes it possible to collect not only the axial length variations but also the radial stresses. due to misalignment between the heating rod 2 and the wire electrode 5B and the vibrations induced in the glow plug by the operation of the motor.

Lors des tractions extrêmes exercées par l'électrode filaire 5A, B vers l'arrière, le fond de la douille 41B sert de butée axiale contre le fond 62B de l'organe de centrage 6B, lui-même immobilisé par l'avant 11 du corps tubulaire 1, ceci garantissant la connexion avec la tête de connexion 27B de la cartouche chauffante 2.During the extreme traction exerted by the wire electrode 5A, B towards the rear, the bottom of the sleeve 41B serves as an axial abutment against the bottom 62B of the centering member 6B, itself immobilized by the front 11 of the tubular body 1, this guaranteeing the connection with the connection head 27B of the heating cartridge 2.

La figure 3 montre le chemin conducteur formé par la première variante d'électrode filaire 5A et la figure 4 montre le chemin conducteur formé par la deuxième variante d'électrode filaire 5B.The figure 3 shows the conductive path formed by the first wired electrode variant 5A and the figure 4 shows the conductive path formed by the second wired electrode variant 5B.

Selon les figures 5A,B, la cosse avant 53A est soudée ou sertie sur l'extrémité arrière 43A du fil de connexion 4A.According to Figures 5A, B , the front lug 53A is welded or crimped on the rear end 43A of the connecting wire 4A.

Selon les figures 6A,B, la cosse avant 53A est soudée à l'extrémité arrière 43A du fil de connexion 4A.According to Figures 6A, B , the front lug 53A is welded to the rear end 43A of the connecting wire 4A.

La figure 7 montre le détail du positionnement de la cosse avant 53B et de la douille de connexion 41B entourée du manchon isolant 6B lui-même fixé à la jonction de l'enveloppe métallique 21 du crayon chauffant 2 et de l'extrémité avant 11 du corps tubulaire 1.The figure 7 shows the detail of the positioning of the front lug 53B and the connecting sleeve 41B surrounded by the insulating sleeve 6B itself attached to the junction of the metal casing 21 of the heating rod 2 and the front end 11 of the tubular body 1 .

La figure 8A montre l'assemblage du manchon isolant 8 dans le lamage 16 du corps tubulaire 1, centré par la surface externe 81 et mis en butée par le fond 83. L'embout de connexion 3 est assemblé avec le manchon isolant 8, centré par la surface 32 mis en butée par le fond 37. La matière déformable du manchon isolant 8 sur le corps 32 de l'embout de connexion 3 pénètre dans plusieurs gorges ou sur une surface moletée du corps 32 pour assurer l'immobilisation axiale vers l'arrière. Les compressions obtenues par l'assemblage de l'embout de connexion 3, du manchon d'isolant 8 et du corps tubulaire 1 assurent l'étanchéité de la zone arrière de la bougie de préchauffage. Le sertissage du bord 17 de l'extrémité arrière du corps tubulaire 1 sur le manchon isolant 8 assure l'immobilisation du manchon d'isolation 8 et de l'embout de connexion 3.The figure 8A shows the assembly of the insulating sleeve 8 in the counterbore 16 of the tubular body 1, centered by the outer surface 81 and abutted by the bottom 83. The connection endpiece 3 is assembled with the insulating sleeve 8, centered by the surface 32 is abutted by the bottom 37. The deformable material of the insulating sleeve 8 on the body 32 of the connecting piece 3 penetrates into several grooves or on a knurled surface of the body 32 to ensure the axial immobilization backwards. The compressions obtained by assembling the connecting piece 3, the insulating sleeve 8 and the tubular body 1 ensure the sealing of the rear zone of the glow plug. The crimping of the edge 17 of the rear end of the tubular body 1 on the insulating sleeve 8 ensures the immobilization of the insulation sleeve 8 and the connection piece 3.

La figure 8B montre une variante de l'embout de connexion 3.The Figure 8B shows a variant of the connector 3.

Le montage de la bougie de préchauffage selon l'invention se fait simplement après avoir réalisé les différents composants :

  • après avoir assemblé la cartouche chauffante 22A, 22B à l'enveloppe métallique 21 par une brasure assurant également la liaison électrique de la masse, et après avoir fixé le connecteur compensateur 4A ou en utilisant la tête de connexion 27B déjà fixée à l'extrémité de la cartouche chauffante 22B, on assemble l'extrémité avant 51A, 51B munie d'une cosse 53A, 53B au fil de connexion 4A ou au connecteur 4B formé d'une douille 41B engagée sur la tête conductrice 27B,
  • on met en place le corps tubulaire 1 et on le soude par une soudure 15 à l'embase 24 de l'enveloppe métallique 21 puis on tire sur la cosse 54A,B de l'extrémité arrière de l'électrode filaire 5A, 5B pour faire sortir la cosse de l'extrémité arrière 12 du corps tubulaire 1 suffisamment pour la relier à la broche 31 de l'embout 3 puis souder la cosse 54A,B à la broche 31, et
  • on emmanche de force le corps 32 de l'embout 3 dans le manchon isolant 8 lui-même engagé dans le lamage de l'extrémité arrière 12 du corps tubulaire 1.
The mounting of the glow plug according to the invention is done simply after having made the various components:
  • after assembling the heating cartridge 22A, 22B to the metal casing 21 by a solder also ensuring the electrical connection of the mass, and after fixing the compensator connector 4A or in using the connection head 27B already attached to the end of the heating cartridge 22B, the front end 51A, 51B provided with a lug 53A, 53B is connected to the connection wire 4A or to the connector 4B formed of a socket 41B engaged on the conductive head 27B,
  • the tubular body 1 is put in place and welded by a weld 15 to the base 24 of the metal casing 21 and then the lug 54A, B is pulled from the rear end of the wire electrode 5A, 5B for pulling out the lug from the rear end 12 of the tubular body 1 sufficiently to connect it to the pin 31 of the endpiece 3 and then solder the lug 54A, B to the pin 31, and
  • the body 32 of the end piece 3 is force-fitted into the insulating sleeve 8 itself engaged in the countersink of the rear end 12 of the tubular body 1.

NOMENCLATURENOMENCLATURE

11
corps tubulaire
11 extrémité avant
12 extrémité arrière
13 filetage extérieur
14 prise d'outil
15 souduretubular body
11 front end
12 rear end
13 external thread
14 tool socket
15 welding
22
crayon chauffant
21 enveloppe métallique
22A,B cartouche chauffante
23 volume libre / chambre
24 embase épaisse
25 lamage
26 surface conique d'étanchéité
27B tête de connexionheating pencil
21 metal envelope
22A, B heating cartridge
23 free volume / chamber
24 thick base
25 coinage
26 conical sealing surface
27B connection head
33
embout de connexion
31 broche
32 corps
33 gorge
34 collerette
35 broche
36 point de soudureconnection tip
31 pin
32 bodies
33 throat
34 collar
35 pin
36 welding spot
4A4A
connecteur compensateur/ fil de connexion
41A extrémité avant
42A segment intermédiaire/segment en surlongueur
43A extrémité arrièrecompensator connector / wire connection
41A front end
42A intermediate segment / extended segment
43A rear end
4B4B
connecteur compensateur
41B douille
42B fondcompensator connector
41B socket
42B background
5A,B5A, B
électrode filaire
51A,B extrémité avant
52A,B extrémité arrière
53A,B cosse avant
54A,B cosse arrièrewired electrode
51A, B front end
52A, B rear end
53A, B front pod
54A, B rear lug
6A6A
organe de centrage en forme de plaquette isolante
61A perçagecentering member in the form of an insulating wafer
61A drilling
6B6B
organe de centrage en forme de manchon isolant
61B paroi latérale
62B fond
63B bourreletcentering member in the form of an insulating sleeve
61B side wall
62B background
63B bead
88
manchon isolant
81 surface externe
82 surface interne
83 fondinsulating sleeve
81 external surface
82 internal surface
83 background

Claims (9)

  1. Glow plug comprising:
    - a metal tubular body (1), one end (11) thereof being terminated by a heating rod (2), the other end (12) thereof bearing a connection end fitting (3) having a body (32) and a pin (31),
    - the heating rod (2) housing the heating filament which is integrated in a heating cartridge (22A, 22B),
    - an electrode (5A, 5B) passing through the tubular body (1) in an insulated manner and electrically connecting the heating filament of the heating cartridge (22A, 22B) and the connection end fitting (3) which is in turn held in an insulated manner in the end of the tubular body (1),
    plug characterized in that
    the conductive path for supplying power to the heating cartridge (22A) comprises:
    - a wire electrode (5A, 5B) having a front end (51A, 51B) and terminated at each end by a terminal (53A, 53B; 54A, 54B), one thereof (53A, 53B) being connected to the heating cartridge (22A, 22B) by being enclosed by an insulating centring member (6A, 6B) which is wedged at the junction of the casing (21) of the heating rod (2) and the front end (11) of the tubular body (1), and the other terminal (54A, 54B) is fixed in a centred position on the pin (31) of the connection end fitting (3) which is in turn engaged in the rear end (12) of the tubular body (1), and
    - a compensating connector (4A, 4B) connecting the front terminal (53A, 53B) of the wire electrode (5A, 5B) to the heating cartridge (22A, 22B).
  2. Glow plug according to Claim 1, characterized in that
    the compensating connector (4A) is in the form of a wire connected to the front terminal (53A) and to the heating cartridge (22A).
  3. Glow plug according to Claim 2, characterized in that
    - the compensating connector in the form of a wire (4A) is connected to the wire electrode (5A) by a fixed connection blocking the rear end (43A) of the connecting wire (4A) on the front terminal (53A) of the wire electrode (5A),
    - the connecting wire (4A) has an intermediate segment (42A) between its front segment (41A) which is fixed to the heating cartridge (22A) and its rear segment (43A) which is fixed to the front terminal (53A), this intermediate segment (43A) having an excess length relative to the length (L) between the points for fixing the connecting wire (4A) to the heating cartridge (22A) and the wire electrode (5A) in the resting position, in order to achieve an extended length which is greater than the extension of the length (L) in the operating state of the glow plug, when brought to operating temperature, and
    - a centring member (6A) which is positioned at the junction of the connector (4A, 43A) and the terminal (53A) of the wire electrode (5A) in the body (1) of the glow plug.
  4. Glow plug according to Claim 2, characterized in that
    the connecting wire (4A) has a segment with an excess length (42A) having a shape selected from the group comprising:
    - an S-shape in plan view, a Z-shape in plan view, a three-dimensional S-shape, a three-dimensional Z-shape,
    - a shape having the form of a spiral or spirals.
  5. Glow plug according to Claim 3, characterized in that
    the centring member (6A) is a small circular disc which is penetrated by an axial drilled hole (61A) for the passage of the front terminal (53A) receiving the rear end (43A) of the connecting wire (4A) and fixed to the front end (51A) of the wire electrode (5A), and the opening of the casing (21) of the heating rod (2) comprises a counterbore (25) to receive the centring member (6A) in abutment.
  6. Glow plug according to Claim 2, characterized in that
    the rear end (43A) of the connecting wire (4A) is connected to the front terminal (53A) of the wire electrode (5A) by welding or crimping.
  7. Glow plug according to Claim 1, characterized in that
    - the front terminal (53B) of the wire element (5B) is connected to a compensating connector (4B) formed from a conductive bushing (41B) which is connected by the terminal (53B) to the front end (51B) of the wire electrode (5B), this conductive bushing (41B) being housed in a centring member (6B) in the form of an insulating sleeve, and
    - the end of the heating cartridge (22B) comprises a conductive head (27B) which is connected to one end of its heating filament and which is housed by being fitted into the bushing (41B) of the connector (4B).
  8. Method for producing a glow plug according to any one of Claims 1 to 7, characterized in that
    - the various components are produced,
    - the heating cartridge (22A) is fixed to the metal casing (21) by soldering, which also ensures an earthed electrical connection,
    - the compensating connector (4A) is fixed to the end of the heating cartridge (22A),
    - the front end (51A) which is provided with a terminal (53A) is assembled with the wire of the compensating connector (4A),
    - the tubular body (1) is put in position and welded by a weld (15) to the socket (24) of the metal casing (21), then the terminal (54A) of the rear end of the wire electrode (5A) is pulled in order to remove the terminal from the rear end (12) of the tubular body (1) to a sufficient extent in order to connect the terminal to the pin (31) of the end fitting (3) and then to weld the terminal (54A) to the pin (31), and
    - the body (32) of the end fitting (3) is force-fitted into the insulating sleeve which is in turn engaged in the counterbore of the rear end (12) of the tubular body (1).
  9. Method for producing a glow plug according to any one of Claims 1 to 7, characterized in that
    - the various components are produced,
    - the heating cartridge (22B) is assembled with the metal casing (21) by soldering, which also ensures an earthed electrical connection,
    - the connecting head (27B), which is already fixed to the end of the heating cartridge (22B), is fixed,
    - the front end (51B) which is provided with a terminal (53B) is assembled with the connector (4B) which is formed by a bushing (41B) which is engaged on the conductive head (27B),
    - the tubular body (1) is put in position and welded by a weld (15) to the socket (24) of the metal casing (21), then the terminal (54B) of the rear end of the wire electrode (5B) is pulled in order to remove the terminal from the rear end (12) of the tubular body (1) to a sufficient extent in order to connect the terminal to the pin (31) of the end fitting (3) and then to weld the terminal (54B) to the pin (31), and
    - the body (32) of the end fitting is force-fitted into the insulating sleeve which is in turn engaged in the counterbore of the rear end (12) of the tubular body (1).
EP13815393.7A 2012-12-04 2013-12-03 Glow plug for diesel motor with wire electrode Not-in-force EP2929251B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1261590A FR2998947A1 (en) 2012-12-04 2012-12-04 WIRED ELECTRODE DIESEL ENGINE PREHEATING SPARK PLUG
PCT/EP2013/075433 WO2014086801A1 (en) 2012-12-04 2013-12-03 Diesel engine heater plug with wire electrode

Publications (2)

Publication Number Publication Date
EP2929251A1 EP2929251A1 (en) 2015-10-14
EP2929251B1 true EP2929251B1 (en) 2019-02-27

Family

ID=47833214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13815393.7A Not-in-force EP2929251B1 (en) 2012-12-04 2013-12-03 Glow plug for diesel motor with wire electrode

Country Status (4)

Country Link
EP (1) EP2929251B1 (en)
JP (1) JP5918453B2 (en)
FR (2) FR2998947A1 (en)
WO (1) WO2014086801A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014211223A1 (en) * 2013-06-24 2014-12-24 Robert Bosch Gmbh Glow plug for diesel engine with wire electrode
FR3025023B1 (en) * 2014-08-22 2016-09-30 Bosch Gmbh Robert CENTRAL ELECTRODE CURING SPARK PLUG WITH CORROL TONGUE CONNECTION

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1172229A (en) * 1997-08-28 1999-03-16 Denso Corp Glow plug and manufacture thereof

Family Cites Families (7)

* 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
JPS60114629A (en) * 1983-11-28 1985-06-21 Jidosha Kiki Co Ltd Glow plug for diesel engine
US4661686A (en) * 1984-04-12 1987-04-28 Ngk Spark Plug Co., Ltd Dual line ceramic glow plug
JP2001141238A (en) * 1999-09-03 2001-05-25 Bosch Automotive Systems Corp Glow plug for diesel engine and method of manufacturing it
JP3664093B2 (en) * 2000-10-18 2005-06-22 株式会社ボッシュオートモーティブシステム Ceramic heater type glow plug
JP2002130672A (en) * 2000-10-25 2002-05-09 Bosch Automotive Systems Corp Ceramic heater type glow plug and its manufacturing method
JP4386117B2 (en) * 2007-08-30 2009-12-16 株式会社デンソー Glow plug with combustion pressure sensor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1172229A (en) * 1997-08-28 1999-03-16 Denso Corp Glow plug and manufacture thereof

Also Published As

Publication number Publication date
FR2998950A1 (en) 2014-06-06
JP5918453B2 (en) 2016-05-18
FR2998947A1 (en) 2014-06-06
JP2015535590A (en) 2015-12-14
WO2014086801A1 (en) 2014-06-12
EP2929251A1 (en) 2015-10-14
FR2998950B1 (en) 2015-01-30

Similar Documents

Publication Publication Date Title
FR3007932A1 (en) ELECTRIC HEATING CARTRIDGE AND METHOD FOR MANUFACTURING THE SAME
FR2831243A1 (en) Preheating plug for Diesel internal combustion engine has liner with heating element at one end and connector cap at other
FR2969741A1 (en) SLEEVE PREHEATING CANDLE EFFORTS SENSOR HEATER FINGER OUTSIDE COMBUSTION CHAMBER
EP2929251B1 (en) Glow plug for diesel motor with wire electrode
EP0886907B1 (en) Compact electric actuator
FR2955172A1 (en) METAL FINGER GLASS CANDLE
FR2893191A1 (en) GLASS-METAL TRAVERSEE, ITS MANUFACTURING METHOD AND ELECTRO-PYROTECHNIC INITIATOR.
EP1690041A1 (en) Preheater plug comprising a pressure sensor and engine fitted therewith
FR2797721A1 (en) SPARK PLUG PROVIDED WITH A PRESSURE SENSOR, AND THERMAL ENGINE PROVIDED WITH SUCH SPARK PLUGS
EP2929249A1 (en) Diesel engine heater plug
EP2944877B1 (en) Glow plug and method for manufacturing same
FR2998928A1 (en) Glow plug for diesel engine, has electrode comprising tubular extensible segment formed by elastically deformable rings connected by connection arches, where arches are shifted from one of rings to following ring in peripheral direction
EP2929250B1 (en) Glow plug for a diesel engine, having a tubular electrode
EP3572238A1 (en) Hub for cycle wheel
FR2811900A1 (en) Parasitic signal filter for the cable of an implantable medical electrical stimulator includes a special device for fixing a capacitor to the housing of the stimulator
FR3025153A1 (en) GLOW PLUG
FR2949538A1 (en) PREHEATING CANDLE AND METHOD OF MANUFACTURING SUCH CANDLE
FR3025023A1 (en) CENTRAL ELECTRODE CURING SPARK PLUG WITH CORROL TONGUE CONNECTION
EP1594201A1 (en) Multiple spark surface discharge spark plug
FR2969686B1 (en) DRIVE AND TRANSMISSION UNIT, FUNCTIONAL ELEMENT AND MOUNTING SHAPE OF THIS UNIT AND FUNCTIONAL ELEMENT
EP3143333A1 (en) Preheater electrode and method for the production thereof
EP2452862B1 (en) Automobile steering gearbox with variable cross-section
EP1202399A2 (en) Road vehicle electric element
FR3033389A1 (en) PREHEATING OR POST-HEATING CANDLE
FR3022012A1 (en) HEAT ENGINE PREHEATING CANDLE

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20150706

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20181031

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1101895

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190315

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602013051540

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20190227

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190627

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190527

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190627

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190527

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190528

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1101895

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190227

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602013051540

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20191128

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602013051540

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20191231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20191203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200701

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191203

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191203

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191203

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191231

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191231

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20131203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190227