WO2015173019A1 - Preheater electrode and method for the production thereof - Google Patents

Preheater electrode and method for the production thereof Download PDF

Info

Publication number
WO2015173019A1
WO2015173019A1 PCT/EP2015/059296 EP2015059296W WO2015173019A1 WO 2015173019 A1 WO2015173019 A1 WO 2015173019A1 EP 2015059296 W EP2015059296 W EP 2015059296W WO 2015173019 A1 WO2015173019 A1 WO 2015173019A1
Authority
WO
WIPO (PCT)
Prior art keywords
connector
electrode
central electrode
primary connector
primary
Prior art date
Application number
PCT/EP2015/059296
Other languages
French (fr)
Inventor
Jean-Marc Couffignal
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
Priority to JP2016566769A priority Critical patent/JP6334736B2/en
Priority to CN201580024883.2A priority patent/CN106461218A/en
Priority to EP15718899.6A priority patent/EP3143333A1/en
Publication of WO2015173019A1 publication Critical patent/WO2015173019A1/en

Links

Classifications

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

Definitions

  • the present invention relates to a prefabricated spark plug for a metal tube or ceramic heating element diesel engine, comprising a tubular metal body having a thread for screwing into the cylinder head of the engine and carrying the heating element in the cylinder head.
  • the cartridge the body being traversed by a central electrode connected to a terminal of the heating element whose other terminal is connected to the body making the connection to ground, the body carrying at its other end a primary connector receiving the connector of the manufacturer.
  • the primary connector installed on the electrode and connected thereto is isolated from the body by an electrical insulation ring.
  • the invention also relates to a method of manufacturing such a preheating electrode.
  • the glow plug is composed at the front, not shown, of a body provided with a heated front end, for example a ceramic cartridge, containing a heating electric filament whose connection is connected to the body tubular 201, conductor, itself connected to the ground by its screwing into the motor and the other connection is connected to a central electrode 203 through the tubular body 201 while being isolated therefrom, to be connected by its other end to the primary connector 205 itself receiving the connector of the manufacturer to thereby supply the heating element.
  • the rear end of the central electrode 203 is provided with a knurled portion 231 and is housed in the blind hole 251 of the cone.
  • primary element 205 to be crimped.
  • the crimping 232 is made by transverse compression along the directions (S, S) perpendicular to the axis xx of the candle 200.
  • the crimping of the connector 205 on the end 231 of the central electrode 203 is a relatively long operation, which reduces the manufacturing efficiency. Due to the nature of the operation and the tooling used, crimping is rigid from the point of view of the change of production series. To change from a series of glow plugs to another with different dimensions, it is necessary to change the tooling for crimping.
  • Crimping also has drawbacks and failures, both in the manufacture and use of the candle.
  • the resistivity can have a large dispersion from one electrode to the other because of the pressure variations exerted for crimping as well as variations related to the quality and the nature of the surface treatment of the blind hole 251 of the primary connector 205 and the quality and cleanliness of the knurling 231 of the electrode 203.
  • these resistivity variations result in variations in the electrical intensity during the operation of the candle. These differences in turn generate heating temperature differences that can have a negative impact on combustion in the diesel engine.
  • the crimp 232 also has the disadvantage that the contact surfaces between the blind hole 251 of the connector 205 and the knurling 231 of the central electrode 203, at the crimp 232, undergo degeneration due to at electrical micro-arcs induced micromovements between the primary connector 205 t the electrode 203, themselves caused by engine vibrations. This degeneration is irreversible and increases the resistivity having effects similar to those already described.
  • the contact between the connector 205 generally made of brass or aluminum alloy core coated with a surface treatment to nickel base for example, and the central electrode made of steel creates a stack effect due to the different electrochemical potentials of the two metals, causing the wear of the electrical contact.
  • the present invention aims to simplify the manufacture of the glow plug and improve its reliability and efficiency at the time of manufacture and in its aging.
  • the subject of the present invention is a glow plug of the type defined above, characterized in that the primary steel connector is tubular, open, the central electrode has a smooth end housed in the through bore the primary connector and a laser weld secures the end of the electrode inside the connector through its opening.
  • the candle according to the invention has a particularly simple structure, composed of a reduced number of elements which are easily assembled, thus simplifying the automatic manufacture.
  • the contact between the connector and the central electrode is particularly reliable and insensitive to aging, since it is a laser weld and is itself protected against corrosion since housed in a protected manner in the primary connector tubular on the one hand and in the connector of the manufacturer on the other hand.
  • This solder, housed in the through bore of the primary connector does not affect the quality of the electrical contact between the primary connector and the connector of the manufacturer which is performed on the outer surfaces of the primary connector.
  • the candle has a resistance of passage very precise and especially identical for all the candles of the same series manufacture. Thus, the efficiency of preheating by the candle according to the invention is particularly regular.
  • the invention also relates to a method for producing such a ceramic cartridge or metal tube preheating plug comprising a tubular metal body provided with a thread for screwing into the cylinder head of the engine and carrying the heating element in the cartridge, the body being traversed by a central electrode connected to a terminal of the heating element whose other terminal is connected to the body making the connection to ground, the body carrying at its other end a primary connector receiving the connector of the manufacturer, this primary connector being installed on the electrode and connected thereto being isolated from the body by a ring of Electrical insulation characterized in that a candle body, an open tubular steel connector, a central steel electrode are made, the front part of the candle is assembled with its central electrode engaged in the body.
  • the primary connector is connected to the central electrode with the insertion of an insulating ring bearing against the flange of the body, and the rear end of the central electrode is welded to the primary connector through the opening of the primary connector.
  • the method according to the invention has the advantage of being of a particularly simple embodiment both for the manufacture of the components of the candle and for their assembly including the final assembly with welding of the central electrode to the primary connector.
  • Access to the welding zone is very simple since the laser beam passes through the opening of the primary connector.
  • the connector has a through bore, the placement of the connector on the center electrode and the compression of the gasket and the blind seal electrical insulation have no consequence on the positioning of the end of the electrode in the connector. This positioning does not influence the welding which is always done by the opening of the connector and is not influenced by the possible variation of position of the welding zone from one candle to another.
  • This manufacturing method that is to say the welding between the electrode and primary connector is practically independent of the size of the glow plug not requiring special tools to make the connection between the electrode and the connector primary since the connection is always performed by laser welding.
  • FIG. 1 is a partially cutaway view of a preheating plug in axial section of the rear portion of a preheating plug according to the invention.
  • FIG. 2 is an axial section of the rear part of a glow plug according to the state of the art
  • the glow plug according to the invention consists of a tubular body 1 whose front end 1 1 (AV side) is provided with a heating cartridge 2, made of ceramic or with a metal tube, housing a resistant filament, heating a connection of which is connected to the tubular body 1 which establishes the connection with the ground of the onboard circuit and the other connection is connected to the central electrode 3. Only the central electrode 3 and the tubular body 1 towards the rear of the glow plug are shown cut.
  • the tubular body 1, rear side 12 (AR), has a thread 121 for screwing into the cylinder head of the engine establishing by this contact, the electrical connection for the grounding of the tubular body.
  • the tubular body 1 comprises a tool socket 122, for example a hexagonal socket.
  • the tubular body is traversed by the central electrode 3 which is held by the tubular body, at the rear, by an assembly 4 formed of a seal 41 and an electrical insulation ring 42.
  • the back of the glow plug comprises a primary connector 5, tubular, provided with a through bore 51, the assembly being aligned on the axis xx of the candle. This through bore 51 receives the rear end 31 of the central electrode 3.
  • the central electrode 3 is smooth without knurling or special machining.
  • the primary connector 5 comprises at the front a stop flange 52 to bear against the insulating ring 42 and compress the seal 41.
  • the connector 5 also comprises a lashing collar 53 limiting the location 54 receiving the particular connector, not shown, the car manufacturer installing the spark plug in its engine.
  • the bore 51 of the connector 5 is through, that is to say that it is open not only at the front but also at the rear, leaving an opening 55.
  • the central electrode 3 arrives near the rear end of the primary connector 5.
  • the rear portion 54 of the primary connector 5 externally, receives the manufacturer's connector which is specific to the manufacturer so that the same primary connector 5 allows the adaptation of the glow plug to the different connectors of the manufacturers.
  • the primary connector 5 is connected to the central electrode 3 by a laser weld 32 whose beam is directed along the axis xx (direction L) through the opening 55 so as to weld the end of the electrode central 3 inside the bore 51 of the primary connector 5.
  • the weld is schematized by the volume W. This weld leaves intact the outer surface 54 so that it retains its usual shape suitable for all the connectors of manufacturers of one part and its quality of electrical exchange on the other hand.
  • the primary connector 5 is made of steel so that the material of the central electrode 3 and that of the primary connector 5 are substantially identical to achieve a reliable and stable welding.
  • the weld 32 provides the electrical connection between the central electrode 3 and the primary connector 5 which are thus assembled permanently and without the addition of external material.
  • the solder is an irreversible bond and very stable from the point of view of resistivity and insensitive to degeneration due to engine vibrations.
  • the assembly described above holds in place the components, namely the tubular body 1, the seal 41, the electric insulating ring 42, the central electrode 3 and the connector 5 thanks to the weld 32.
  • the central steel electrode 3 is a smooth electrode that does not require any particular machining.
  • the method for producing the glow plug 100 described above consists in producing a tubular steel body in which the heating cartridge 2 is integrated and then the heating cartridge is connected to the tubular body 1 for grounding. .
  • the other connection of the heating cartridge 2 is made at the front end of the central electrode 3 which is installed in the tubular body 1.
  • the primary connector 5 is connected to the central electrode 3 with the interposition of the seal 41 and the insulating ring 42 bearing against the rear of the tubular body 1.
  • the back end is laser welded from the central electrode to the primary connector 5 through the rear opening 55 of the primary connector 5.

Abstract

The invention relates to a preheater plug comprising a body (1) with a heating cartridge (2) and an open-ended steel primary connector (5) of tubular shape (51) with open ends. The central electrode has a smooth end which is accommodated in the through-bore (51) of the connector (3). A laser weld integrally connects the end of the electrode (3) to the interior of the connector (5) through the opening (55) therein.

Description

Electrode de préchauffaqe et son procédé de fabrication  Preheating electrode and method of manufacturing
Domaine de l'invention Field of the invention
La présente invention se rapporte à une bougie de pré- chauffage pour moteur diesel à élément chauffant à tube métallique ou en céramique indifféremment comprenant un corps métallique tubulaire muni d'un filetage pour se visser dans la culasse du moteur et portant l'élément chauffant dans la cartouche, le corps étant traversé par une électrode centrale reliée à une borne de l'élément chauffant dont l'autre borne est reliée au corps faisant la liaison à la masse, le corps portant à son autre extrémité un connecteur primaire recevant le connecteur du constructeur. Le connecteur primaire installé sur l'électrode et relié à celle-ci en est isolé du corps par une bague d'isolation électrique.  The present invention relates to a prefabricated spark plug for a metal tube or ceramic heating element diesel engine, comprising a tubular metal body having a thread for screwing into the cylinder head of the engine and carrying the heating element in the cylinder head. the cartridge, the body being traversed by a central electrode connected to a terminal of the heating element whose other terminal is connected to the body making the connection to ground, the body carrying at its other end a primary connector receiving the connector of the manufacturer. The primary connector installed on the electrode and connected thereto is isolated from the body by an electrical insulation ring.
L'invention se rapporte également à un procédé de fabri- cation d'une telle électrode de préchauffage.  The invention also relates to a method of manufacturing such a preheating electrode.
Etat de la technique State of the art
Selon l'état de la technique, on connaît différentes bougies de préchauffage. L'une de ces bougies 200 est représentée en coupe à la figure 2 pour la partie arrière, celle située au niveau de la fixation du corps 201 de la bougie dans la chambre du moteur et la partie qui en dépasse pour recevoir le connecteur du constructeur. Ce connecteur est en général propre au constructeur alors que les autres parties de la bougie de préchauffage sont les mêmes, quel que soit le constructeur automobile qui l'utilise, c'est-à-dire installe la bougie de préchauffage.  According to the state of the art, various glow plugs are known. One of these candles 200 is shown in section in Figure 2 for the rear part, the one located at the attachment of the body 201 of the spark plug in the engine chamber and the part that protrudes to receive the connector of the manufacturer . This connector is generally manufacturer-specific while the other parts of the glow plug are the same, regardless of the car manufacturer who uses it, that is to say, installs the glow plug.
Selon la figure 2, la bougie de préchauffage se compose à l'avant, non représenté, d'un corps muni d'une extrémité avant chauffante, par exemple une cartouche en céramique, contenant un filament électrique chauffant dont une connexion est reliée au corps tubulaire 201 , conducteur, lui-même relié à la masse par son vissage dans le mo- teur et dont l'autre connexion est reliée à une électrode centrale 203 traversant le corps tubulaire 201 tout en étant isolée de celui-ci, pour être reliée par son autre extrémité au connecteur primaire 205 recevant lui-même le connecteur du constructeur pour alimenter ainsi l'élément chauffant. L'extrémité arrière de l'électrode centrale 203 est munie d'une partie moletée 231 et se loge dans le perçage borgne 251 du con- necteur primaire 205 pour y être sertie. Le sertissage 232 se fait par une compression transversale suivant les directions (S, S) perpendiculaires à l'axe xx de la bougie 200. According to FIG. 2, the glow plug is composed at the front, not shown, of a body provided with a heated front end, for example a ceramic cartridge, containing a heating electric filament whose connection is connected to the body tubular 201, conductor, itself connected to the ground by its screwing into the motor and the other connection is connected to a central electrode 203 through the tubular body 201 while being isolated therefrom, to be connected by its other end to the primary connector 205 itself receiving the connector of the manufacturer to thereby supply the heating element. The rear end of the central electrode 203 is provided with a knurled portion 231 and is housed in the blind hole 251 of the cone. primary element 205 to be crimped. The crimping 232 is made by transverse compression along the directions (S, S) perpendicular to the axis xx of the candle 200.
Cette solution a un certain nombre d'inconvénients. Le sertissage du connecteur 205 sur l'extrémité 231 de l'électrode centrale 203 est une opération relativement longue, ce qui réduit le rendement de la fabrication. Du fait de la nature de l'opération et de l'outillage utilisé, le sertissage est rigide du point de vue du changement de série de fabrication. Pour passer d'une série de bougies de préchauffage à une autre avec des dimensions différentes, il faut changer l'outillage réalisant le sertissage.  This solution has a number of disadvantages. The crimping of the connector 205 on the end 231 of the central electrode 203 is a relatively long operation, which reduces the manufacturing efficiency. Due to the nature of the operation and the tooling used, crimping is rigid from the point of view of the change of production series. To change from a series of glow plugs to another with different dimensions, it is necessary to change the tooling for crimping.
Le sertissage présente également des inconvénients et des défaillances, tant à la fabrication qu'à l'usage de la bougie.  Crimping also has drawbacks and failures, both in the manufacture and use of the candle.
Au moment du sertissage, on ne peut obtenir une résisti- vité ou conduction électrique précise entre le connecteur 205 et l'électrode centrale 203 ; la résistivité peut avoir une grande dispersion d'une électrode à l'autre à cause des variations de pression exercées pour le sertissage ainsi que des variations liées à la qualité et la nature du traitement de surface du perçage borgne 251 du connecteur pri- maire 205 ainsi que de la qualité et la propreté du moletage 231 de l'électrode 203. Or, ces variations de résistivité se traduisent par des variations de l'intensité électrique pendant le fonctionnement de la bougie. Ces différences génèrent à leur tour des différences de température de chauffage qui peuvent avoir un impact négatif sur la combustion dans le moteur Diesel.  At the time of crimping, precise electrical resistance or conduction can not be obtained between connector 205 and central electrode 203; the resistivity can have a large dispersion from one electrode to the other because of the pressure variations exerted for crimping as well as variations related to the quality and the nature of the surface treatment of the blind hole 251 of the primary connector 205 and the quality and cleanliness of the knurling 231 of the electrode 203. However, these resistivity variations result in variations in the electrical intensity during the operation of the candle. These differences in turn generate heating temperature differences that can have a negative impact on combustion in the diesel engine.
En fonctionnement et au vieillissement, le sertissage 232 présente également l'inconvénient que les surfaces de contact entre le perçage borgne 251 du connecteur 205 et le moletage 231 de l'électrode centrale 203, au niveau du sertissage 232, subissent une dégénéres- cence due à des micro-arcs électriques, induits des micromouvements entre le connecteur primaire 205 t l'électrode 203, eux même provoqués par des vibrations moteur. Cette dégénérescence est irréversible et augmente la résistivité ayant les effets similaires à ceux déjà décrits. A cela s'ajoute que le contact entre le connecteur 205, en général en laiton ou en alliage d'aluminium à cœur revêtu d'un traitement de surface à base nickel par exemple, et l'électrode centrale en acier crée un effet de pile du fait des potentiels électrochimiques différents des deux métaux, provoquant l'usure du contact électrique. In operation and aging, the crimp 232 also has the disadvantage that the contact surfaces between the blind hole 251 of the connector 205 and the knurling 231 of the central electrode 203, at the crimp 232, undergo degeneration due to at electrical micro-arcs induced micromovements between the primary connector 205 t the electrode 203, themselves caused by engine vibrations. This degeneration is irreversible and increases the resistivity having effects similar to those already described. In addition, the contact between the connector 205, generally made of brass or aluminum alloy core coated with a surface treatment to nickel base for example, and the central electrode made of steel creates a stack effect due to the different electrochemical potentials of the two metals, causing the wear of the electrical contact.
But de l'invention Purpose of the invention
La présente invention a pour but de simplifier la fabrication de la bougie de préchauffage et d'améliorer sa fiabilité et son efficacité au moment de la fabrication et dans son vieillissement.  The present invention aims to simplify the manufacture of the glow plug and improve its reliability and efficiency at the time of manufacture and in its aging.
Exposé et avantages de l'invention Description and advantages of the invention
A cet effet, la présente invention a pour objet une bougie de préchauffage du type défini ci-dessus caractérisée en ce que le connecteur primaire en acier est de forme tubulaire, ouverte, l'électrode centrale à une extrémité lisse logée dans l'alésage traversant du connecteur primaire et une soudure par laser solidarise l'extrémité de l'électrode à l'intérieur du connecteur à travers son ouverture.  For this purpose, the subject of the present invention is a glow plug of the type defined above, characterized in that the primary steel connector is tubular, open, the central electrode has a smooth end housed in the through bore the primary connector and a laser weld secures the end of the electrode inside the connector through its opening.
La bougie selon l'invention a une structure particulièrement simple, composée d'un nombre réduit d'éléments qui s'assemblent facilement, simplifiant ainsi la fabrication automatique. Le contact entre le connecteur et l'électrode centrale est particulièrement fiable et insensible au vieillissement, puisqu'il s'agit d'une soudure faite au laser et qui est elle-même protégée contre la corrosion puisque logée de manière protégée dans le connecteur primaire tubulaire d'une part et dans le connecteur du constructeur d'autre part. Cette soudure, logée dans l'alésage traversant du connecteur primaire n'affecte en rien la qualité du contact électrique entre le connecteur primaire et el connecteur du constructeur qui s'effectue sur les surfaces extérieures du connecteur primaire. La bougie présente une résistance de passage très précise et surtout identique pour toutes les bougies d'une même série fabrication. Ainsi, l'efficacité du préchauffage par la bougie selon l'invention est particulièrement régulière.  The candle according to the invention has a particularly simple structure, composed of a reduced number of elements which are easily assembled, thus simplifying the automatic manufacture. The contact between the connector and the central electrode is particularly reliable and insensitive to aging, since it is a laser weld and is itself protected against corrosion since housed in a protected manner in the primary connector tubular on the one hand and in the connector of the manufacturer on the other hand. This solder, housed in the through bore of the primary connector does not affect the quality of the electrical contact between the primary connector and the connector of the manufacturer which is performed on the outer surfaces of the primary connector. The candle has a resistance of passage very precise and especially identical for all the candles of the same series manufacture. Thus, the efficiency of preheating by the candle according to the invention is particularly regular.
L'invention a également pour objet un procédé de réalisation d'une telle bougie de préchauffage à cartouche en céramique ou à tube métallique comprenant un corps métallique tubulaire muni d'un filetage pour se visser dans la culasse du moteur et portant l'élément chauffant dans la cartouche, le corps étant traversé par une électrode centrale reliée à une borne de l'élément chauffant dont l'autre borne est reliée au corps faisant la liaison à la masse, le corps portant à son autre extrémité un connecteur primaire recevant le connecteur du constructeur, ce connecteur primaire étant installé sur l'électrode et relié à celle- ci en étant isolé du corps par une bague d'isolation électrique procédé caractérisé en ce qu'on réalise un corps de bougie, un connecteur tubu- laire ouvert en acier, une électrode centrale en acier, on assemble la partie avant de la bougie avec son électrode centrale engagée dans le corps. On emmanche le connecteur primaire sur l'électrode centrale avec interposition d'une bague isolante en appui contre la collerette du corps, et on soude au laser l'extrémité arrière de l'électrode centrale au connecteur primaire à travers l'ouverture du connecteur primaire. The invention also relates to a method for producing such a ceramic cartridge or metal tube preheating plug comprising a tubular metal body provided with a thread for screwing into the cylinder head of the engine and carrying the heating element in the cartridge, the body being traversed by a central electrode connected to a terminal of the heating element whose other terminal is connected to the body making the connection to ground, the body carrying at its other end a primary connector receiving the connector of the manufacturer, this primary connector being installed on the electrode and connected thereto being isolated from the body by a ring of Electrical insulation characterized in that a candle body, an open tubular steel connector, a central steel electrode are made, the front part of the candle is assembled with its central electrode engaged in the body. The primary connector is connected to the central electrode with the insertion of an insulating ring bearing against the flange of the body, and the rear end of the central electrode is welded to the primary connector through the opening of the primary connector. .
Le procédé selon l'invention a l'avantage d'être d'une réalisation particulièrement simple tant pour la fabrication des composants de la bougie que pour leur assemblage notamment l'assemblage final avec soudage de l'électrode centrale au connecteur primaire. L'accès à la zone de soudage est très simple puisque le faisceau laser passe par l'ouverture du connecteur primaire. Comme le connecteur a un alésage traversant, la mise en place du connecteur sur l'électrode centrale et la compression du joint d'étanchéité et du joint borgne d'isolation électrique n'ont pas de conséquence sur le positionnement de l'extrémité de l'électrode dans le connecteur. Ce positionnement n'influence pas le soudage qui se fait toujours par l'ouverture du connecteur et n'est pas influencé par l'éventuelle variation de position de la zone de soudage d'une bougie à l'autre.  The method according to the invention has the advantage of being of a particularly simple embodiment both for the manufacture of the components of the candle and for their assembly including the final assembly with welding of the central electrode to the primary connector. Access to the welding zone is very simple since the laser beam passes through the opening of the primary connector. As the connector has a through bore, the placement of the connector on the center electrode and the compression of the gasket and the blind seal electrical insulation have no consequence on the positioning of the end of the electrode in the connector. This positioning does not influence the welding which is always done by the opening of the connector and is not influenced by the possible variation of position of the welding zone from one candle to another.
Ce procédé de fabrication, c'est-à-dire la soudure entre l'électrode et connecteur primaire est pratiquement indépendant de la taille de la bougie de préchauffage ne nécessitant pas d'outillage particulier pour réaliser la connexion entre l'électrode et le connecteur primaire puisque la liaison est toujours réalisée par soudage au laser.  This manufacturing method, that is to say the welding between the electrode and primary connector is practically independent of the size of the glow plug not requiring special tools to make the connection between the electrode and the connector primary since the connection is always performed by laser welding.
Enfin, la mise en place de ce procédé de soudure, permet dans un même temps, de supprimer l'opération de moletage sur la partie arrière de l'électrode centrale. Cela simplifie la fabrication, diminue les investissements en machines et améliore la gestion économique de production. Dessins Finally, the implementation of this welding process, allows at the same time, to remove the knurling operation on the rear portion of the central electrode. This simplifies manufacturing, decreases investment in machinery and improves the economic management of production. drawings
La présente invention sera décrite ci-après de manière plus détaillée par comparaison à une bougie de préchauffage connue et également représentée dans les dessins annexés dans lesquels :  The present invention will be described hereinafter in more detail by comparison with a known glow plug and also shown in the accompanying drawings in which:
- la figure 1 est une vue partiellement coupée d'une bougie de pré- chauffage en coupe axiale de la partie arrière d'une bougie de pré- chauffage selon l'invention. - Figure 1 is a partially cutaway view of a preheating plug in axial section of the rear portion of a preheating plug according to the invention.
la figure 2 est une coupe axiale de la partie arrière d'une bougie de préchauffage selon l'état de la technique,  FIG. 2 is an axial section of the rear part of a glow plug according to the state of the art,
Description d'un mode de réalisation de l'invention Description of an embodiment of the invention
A la figure 1 , la bougie de préchauffage selon l'invention se compose d'un corps tubulaire 1 dont l'extrémité avant 1 1 (côté AV), est munie d'une cartouche chauffante 2, en céramique ou à tube métallique, logeant un filament résistant, chauffant dont une connexion est reliée au corps tubulaire 1 qui établit la liaison avec la masse du circuit embarqué et dont l'autre connexion est reliée à l'électrode centrale 3. Seule l'électrode centrale 3 et le corps tubulaire 1 vers l'arrière de la bougie de préchauffage sont représentés coupés.  In FIG. 1, the glow plug according to the invention consists of a tubular body 1 whose front end 1 1 (AV side) is provided with a heating cartridge 2, made of ceramic or with a metal tube, housing a resistant filament, heating a connection of which is connected to the tubular body 1 which establishes the connection with the ground of the onboard circuit and the other connection is connected to the central electrode 3. Only the central electrode 3 and the tubular body 1 towards the rear of the glow plug are shown cut.
Le corps tubulaire 1 , côté arrière 12 (AR), comporte un filetage 121 pour se visser dans la culasse du moteur en établissant par ce contact, la liaison électrique pour la mise à la masse du corps tubulaire.  The tubular body 1, rear side 12 (AR), has a thread 121 for screwing into the cylinder head of the engine establishing by this contact, the electrical connection for the grounding of the tubular body.
Au-delà du filetage 121, le corps tubulaire 1 comporte une prise d'outil 122, par exemple une prise hexagonale.  Beyond the thread 121, the tubular body 1 comprises a tool socket 122, for example a hexagonal socket.
Intérieurement, le corps tubulaire est traversé par l'électrode centrale 3 qui est maintenue par le corps tubulaire, à l'arrière, par un assemblage 4 formé d'un joint d'étanchéité 41 et d'une bague d'isolation électrique 42. L'arrière de la bougie de préchauffage comporte un connecteur primaire 5, tubulaire, muni d'un alésage traversant 51 , l'ensemble étant aligné sur l'axe xx de la bougie. Cet alésage traversant 51 reçoit l'extrémité arrière 31 de l'électrode centrale 3. L'électrode centrale 3 est lisse sans moletage ni usinage particulier.  Internally, the tubular body is traversed by the central electrode 3 which is held by the tubular body, at the rear, by an assembly 4 formed of a seal 41 and an electrical insulation ring 42. The back of the glow plug comprises a primary connector 5, tubular, provided with a through bore 51, the assembly being aligned on the axis xx of the candle. This through bore 51 receives the rear end 31 of the central electrode 3. The central electrode 3 is smooth without knurling or special machining.
Le connecteur primaire 5 comporte à l'avant une collerette de butée 52 pour s'appuyer contre la bague isolante 42 et comprimer le joint d'étanchéité 41. Le connecteur 5 comporte également une collerette d'arrimage 53 limitant l'emplacement 54 recevant le connecteur particulier, non représenté, du constructeur automobile installant la bougie dans son moteur. The primary connector 5 comprises at the front a stop flange 52 to bear against the insulating ring 42 and compress the seal 41. The connector 5 also comprises a lashing collar 53 limiting the location 54 receiving the particular connector, not shown, the car manufacturer installing the spark plug in its engine.
L'alésage 51 du connecteur 5 est traversant, c'est-à-dire qu'il est ouvert non seulement à l'avant mais également à l'arrière, laissant une ouverture 55.  The bore 51 of the connector 5 is through, that is to say that it is open not only at the front but also at the rear, leaving an opening 55.
L'électrode centrale 3 arrive jusque près de l'extrémité arrière du connecteur primaire 5. La partie arrière 54 du connecteur primaire 5, extérieurement, reçoit le connecteur du constructeur qui est propre au constructeur de sorte que le même connecteur primaire 5 permet l'adaptation de la bougie de préchauffage aux différents connecteurs des constructeurs.  The central electrode 3 arrives near the rear end of the primary connector 5. The rear portion 54 of the primary connector 5, externally, receives the manufacturer's connector which is specific to the manufacturer so that the same primary connector 5 allows the adaptation of the glow plug to the different connectors of the manufacturers.
Le connecteur primaire 5 est relié à l'électrode centrale 3 par une soudure 32 faite au laser dont le faisceau est dirigé suivant l'axe xx (direction L) à travers l'ouverture 55 de façon à souder l'extrémité de l'électrode centrale 3 à l'intérieur de l'alésage 51 du connecteur primaire 5. La soudure est schématisée par le volume W. Cette soudure laisse intacte la surface extérieure 54 pour qu'elle conserve sa forme usuelle adaptée à tous les connecteurs de constructeurs d'une part et sa qualité d'échange électrique d'autre part. Le connecteur primaire 5 est en acier de façon que le matériau de l'électrode centrale 3 et celui du connecteur primaire 5 soient pratiquement identiques pour réaliser une soudure fiable et stable.  The primary connector 5 is connected to the central electrode 3 by a laser weld 32 whose beam is directed along the axis xx (direction L) through the opening 55 so as to weld the end of the electrode central 3 inside the bore 51 of the primary connector 5. The weld is schematized by the volume W. This weld leaves intact the outer surface 54 so that it retains its usual shape suitable for all the connectors of manufacturers of one part and its quality of electrical exchange on the other hand. The primary connector 5 is made of steel so that the material of the central electrode 3 and that of the primary connector 5 are substantially identical to achieve a reliable and stable welding.
La soudure 32 assure la connexion électrique entre l'électrode centrale 3 et le connecteur primaire 5 qui sont ainsi assemblés de manière définitive et sans apport de matière extérieure. La soudure est une liaison irréversible et très stable du point de vue de la résistivité et insensible aux dégénérescences dues aux vibrations du moteur..  The weld 32 provides the electrical connection between the central electrode 3 and the primary connector 5 which are thus assembled permanently and without the addition of external material. The solder is an irreversible bond and very stable from the point of view of resistivity and insensitive to degeneration due to engine vibrations.
L'assemblage décrit ci-dessus maintient en place les composants, à savoir le corps tubulaire 1, le joint d'étanchéité 41 , la bague isolante électrique 42, l'électrode centrale 3 et le connecteur 5 grâce à la soudure 32.  The assembly described above holds in place the components, namely the tubular body 1, the seal 41, the electric insulating ring 42, the central electrode 3 and the connector 5 thanks to the weld 32.
L'électrode centrale en acier 3 est une électrode lisse qui ne nécessite pas d'usinage particulier. Le procédé de réalisation de la bougie de préchauffage 100 décrite ci-dessus consiste à réaliser un corps tubulaire en acier dans lequel on intègre la cartouche chauffante 2 puis on réalise la connexion de la cartouche chauffante avec le corps tubulaire 1 pour la mise à la masse. L'autre connexion de la cartouche chauffante 2 est réalisée au niveau de l'extrémité avant de l'électrode centrale 3 que l'on installe dans le corps tubulaire 1. Puis après cet assemblage de la partie avant de la bougie avec son électrode centrale 3, on emmanche le connecteur primaire 5 sur l'électrode centrale 3 avec interposition du joint d'étanchéité 41 et de la bague isolante 42 venant en appui contre l'arrière du corps tubulaire 1. Ensuite, on soude au laser l'extrémité arrière de l'électrode centrale au connecteur primaire 5 à travers l'ouverture arrière 55 du connecteur primaire 5. The central steel electrode 3 is a smooth electrode that does not require any particular machining. The method for producing the glow plug 100 described above consists in producing a tubular steel body in which the heating cartridge 2 is integrated and then the heating cartridge is connected to the tubular body 1 for grounding. . The other connection of the heating cartridge 2 is made at the front end of the central electrode 3 which is installed in the tubular body 1. Then after this assembly of the front part of the candle with its central electrode 3, the primary connector 5 is connected to the central electrode 3 with the interposition of the seal 41 and the insulating ring 42 bearing against the rear of the tubular body 1. Then, the back end is laser welded from the central electrode to the primary connector 5 through the rear opening 55 of the primary connector 5.

Claims

R E V E N D I C A T I O N S R E V E N D I C A T IO N S
1°) Bougie de préchauffage à cartouche en céramique comprenant : un corps métallique tubulaire muni d'un filetage pour se visser dans la culasse du moteur et portant l'élément chauffant dans la cartouche, le corps étant traversé par une électrode centrale reliée à une borne de l'élément chauffant dont l'autre borne est reliée au corps faisant la liaison à la masse,  1 °) ceramic cartridge glow plug comprising: a tubular metal body provided with a thread for screwing into the cylinder head of the engine and carrying the heating element in the cartridge, the body being traversed by a central electrode connected to a terminal of the heating element whose other terminal is connected to the body making the connection to ground,
le corps portant à son autre extrémité un connecteur primaire recevant le connecteur du constructeur,  the body carrying at its other end a primary connector receiving the connector of the manufacturer,
* ce connecteur primaire installé sur l'électrode et relié à celle- ci, étant isolé du corps par une bague d'isolation électrique, bougie de préchauffage caractérisée en ce que  * This primary connector installed on the electrode and connected thereto, being isolated from the body by an electric insulating ring, glow plug characterized in that
- le connecteur primaire (5) en acier est de forme tubulaire (51), ouverte (55),  the primary connector (5) made of steel is of tubular form (51), open (55),
l'électrode centrale (3) a une extrémité lisse logée dans l'alésage traversant (51) du connecteur primaire (3) et  the central electrode (3) has a smooth end accommodated in the through bore (51) of the primary connector (3) and
- une soudure par laser (32) solidarise l'extrémité de l'électrode (3) à l'intérieur du connecteur (5) à travers son ouverture (55).  - A laser weld (32) secures the end of the electrode (3) inside the connector (5) through its opening (55).
2°) Procédé de réalisation d'une bougie de préchauffage à cartouche en céramique ou à tube métallique comprenant : 2) Method for producing a ceramic cartridge or metal tube preheating candle comprising:
- un corps métallique tubulaire muni d'un filetage pour se visser dans la culasse du moteur et portant l'élément chauffant dans la cartouche, le corps étant traversé par une électrode centrale reliée à une borne de l'élément chauffant dont l'autre borne est reliée au corps faisant la liaison à la masse,  a tubular metal body provided with a thread for screwing into the cylinder head of the engine and carrying the heating element in the cartridge, the body being traversed by a central electrode connected to a terminal of the heating element whose other terminal is connected to the body making the connection to the ground,
- le corps portant à son autre extrémité un connecteur primaire recevant le connecteur du constructeur,  the body carrying at its other end a primary connector receiving the connector of the manufacturer,
* ce connecteur primaire installé sur l'électrode et relié à celle-ci étant isolé du corps par une bague d'isolation électrique, caractérisé en ce qu'  * This primary connector installed on the electrode and connected thereto being isolated from the body by an electrical insulation ring, characterized in that
- on réalise un corps (1) de bougie (100),  a body (1) of candle (100) is produced,
- on réalise un connecteur primaire tubulaire (5) ouvert, en acier, an open tubular primary connector (5) is made of steel,
- on réalise une électrode centrale (3) en acier, on assemble la partie avant de la bougie (100) avec son électrode centrale (3) engagée dans le corps (1), a central electrode (3) made of steel is produced, the front part of the candle (100) is assembled with its central electrode (3) engaged in the body (1),
on emmanche le connecteur primaire (5) sur l'électrode centrale (3) avec interposition d'une bague isolante (42) en appui contre la collerette (122) du corps (1), et the primary connector (5) is connected to the central electrode (3) with the insertion of an insulating ring (42) bearing against the flange (122) of the body (1), and
on soude au laser l'extrémité arrière de l'électrode centrale (3) au connecteur primaire (5) à travers l'ouverture (55) du connecteur primaire (5). the rear end of the central electrode (3) is laser welded to the primary connector (5) through the opening (55) of the primary connector (5).
PCT/EP2015/059296 2014-05-13 2015-04-29 Preheater electrode and method for the production thereof WO2015173019A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2016566769A JP6334736B2 (en) 2014-05-13 2015-04-29 Preheating electrode and manufacturing method thereof
CN201580024883.2A CN106461218A (en) 2014-05-13 2015-04-29 Preheater electrode and method for the production thereof
EP15718899.6A EP3143333A1 (en) 2014-05-13 2015-04-29 Preheater electrode and method for the production thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1454233 2014-05-13
FR1454233A FR3021095B1 (en) 2014-05-13 2014-05-13 PREHEATING ELECTRODE AND METHOD FOR MANUFACTURING THE SAME

Publications (1)

Publication Number Publication Date
WO2015173019A1 true WO2015173019A1 (en) 2015-11-19

Family

ID=51261068

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/059296 WO2015173019A1 (en) 2014-05-13 2015-04-29 Preheater electrode and method for the production thereof

Country Status (5)

Country Link
EP (1) EP3143333A1 (en)
JP (1) JP6334736B2 (en)
CN (1) CN106461218A (en)
FR (1) FR3021095B1 (en)
WO (1) WO2015173019A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114126183A (en) * 2021-10-11 2022-03-01 核工业西南物理研究院 Detachable ion beam accelerating tube

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1283394A2 (en) * 2001-08-10 2003-02-12 Ngk Spark Plug Co., Ltd. Heater
EP1303728B1 (en) * 2000-07-25 2005-10-05 Bosch Automotive Systems Corporation Ceramic heater glow plug and method of manufacturing same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3801756B2 (en) * 1996-11-19 2006-07-26 日本特殊陶業株式会社 Ceramic glow plug
JP2001324141A (en) * 2000-05-16 2001-11-22 Bosch Automotive Systems Corp Ceramic heater type glow plug and its manufacturing method
JP2003185137A (en) * 2001-12-18 2003-07-03 Bosch Automotive Systems Corp Glow plug for diesel engine and method of manufacturing the glow plug
JP2006307834A (en) * 2005-03-31 2006-11-09 Ngk Spark Plug Co Ltd Combustion pressure sensor and glow plug including the same
JP4960118B2 (en) * 2006-03-30 2012-06-27 日本特殊陶業株式会社 Glow plug
KR101470781B1 (en) * 2010-12-02 2014-12-08 니혼도꾸슈도교 가부시키가이샤 Ceramic heater element, ceramic heater, and glow plug
JP2013104648A (en) * 2011-11-17 2013-05-30 Ngk Spark Plug Co Ltd Glow plug and method for manufacturing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1303728B1 (en) * 2000-07-25 2005-10-05 Bosch Automotive Systems Corporation Ceramic heater glow plug and method of manufacturing same
EP1283394A2 (en) * 2001-08-10 2003-02-12 Ngk Spark Plug Co., Ltd. Heater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114126183A (en) * 2021-10-11 2022-03-01 核工业西南物理研究院 Detachable ion beam accelerating tube
CN114126183B (en) * 2021-10-11 2022-10-18 核工业西南物理研究院 Detachable ion beam accelerating tube

Also Published As

Publication number Publication date
JP2017515088A (en) 2017-06-08
EP3143333A1 (en) 2017-03-22
FR3021095A1 (en) 2015-11-20
CN106461218A (en) 2017-02-22
JP6334736B2 (en) 2018-05-30
FR3021095B1 (en) 2016-06-10

Similar Documents

Publication Publication Date Title
FR2831243A1 (en) Preheating plug for Diesel internal combustion engine has liner with heating element at one end and connector cap at other
JP4623645B2 (en) Glow plug
EP0041475A1 (en) Method of manufacturing an ignition device for an internal-combustion engine, and ignition device obtained thereby
WO2012049403A1 (en) Short-circuit prevention in an rf spark plug
FR2865264A1 (en) PREHEATING CANDLE AND METHOD OF MANUFACTURING SUCH CANDLE
EP1612485B2 (en) Glow plug
WO2011117502A1 (en) Riveting element and associated installation tool
EP3143333A1 (en) Preheater electrode and method for the production thereof
FR3102015A1 (en) Two-piece electrical power contact for an electric vehicle charging circuit
EP1594201A1 (en) Multiple spark surface discharge spark plug
EP0565465A1 (en) Electrical socket for a connection terminal
FR2758661A1 (en) High current connector for cable on bolted terminal post for vehicles
EP0121637B1 (en) Straight electrical connecting end piece
WO2015173017A1 (en) Preheater electrode with insulating seal
EP2929249A1 (en) Diesel engine heater plug
FR3025153A1 (en) GLOW PLUG
FR2949538A1 (en) PREHEATING CANDLE AND METHOD OF MANUFACTURING SUCH CANDLE
FR2777122A1 (en) Luminescent tube connection cap for luminous road route signs
FR3033389A1 (en) PREHEATING OR POST-HEATING CANDLE
WO2014086792A1 (en) Glow plug for a diesel engine, having a tubular electrode
FR2998947A1 (en) WIRED ELECTRODE DIESEL ENGINE PREHEATING SPARK PLUG
WO2015185436A9 (en) Pre-heating glow plug for heat engine
FR2975757A1 (en) HEATING DEVICE, ESPECIALLY PREHEATING CANDLE AND METHOD OF MANUFACTURING
FR2910596A1 (en) CANDLE-PENCIL
WO2019086266A1 (en) Fuse and method for producing and mounting said fuse

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15718899

Country of ref document: EP

Kind code of ref document: A1

REEP Request for entry into the european phase

Ref document number: 2015718899

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2015718899

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2016566769

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE