EP3034824A1 - Device for mounting an oxygen probe on a vehicle catalytic converter - Google Patents

Device for mounting an oxygen probe on a vehicle catalytic converter Download PDF

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Publication number
EP3034824A1
EP3034824A1 EP15199280.7A EP15199280A EP3034824A1 EP 3034824 A1 EP3034824 A1 EP 3034824A1 EP 15199280 A EP15199280 A EP 15199280A EP 3034824 A1 EP3034824 A1 EP 3034824A1
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EP
European Patent Office
Prior art keywords
cable
bent portion
guide piece
catalytic converter
mounting
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.)
Granted
Application number
EP15199280.7A
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German (de)
French (fr)
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EP3034824B1 (en
Inventor
Pascal Hottebart
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Renault SAS
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Renault SAS
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Publication of EP3034824A1 publication Critical patent/EP3034824A1/en
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Publication of EP3034824B1 publication Critical patent/EP3034824B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors

Definitions

  • the invention relates to a device for mounting an oxygen sensor on a catalytic converter of a vehicle.
  • a pollution control system of a motor vehicle equipped with a heat engine comprises a catalytic converter mounted on an exhaust line of said engine in order to reduce the emissions of polluting particles.
  • an oxygen sensor consisting of a cable and a plug is mounted upstream of said catalytic converter in order to measure the oxygen content and to transmit to a control unit a signal corresponding to this measurement.
  • the control unit determines the proportion of the air / fuel mixture for which the efficiency of the engine is optimal, said efficiency resulting in a low level of discharges of polluting particles and possibly reduced consumption.
  • the cables of these oxygen probes are mounted by means of at least one holding clip, requiring the presence of at least one visual mark on said cables, in the form of a colored zone. Indeed, the cables must be mounted so that each clip comes to be positioned at a specific colored area of the cable.
  • a cable marking is a restrictive operation and, despite the presence of holding clips, the cables can undergo marked bends making their assembly rough and fragile.
  • a device according to the invention allows to mount an oxygen sensor on a catalytic converter by overcoming the disadvantages noted in the state of the art.
  • the subject of the invention is a device for mounting an oxygen probe on a catalytic converter of a device for the depollution of a vehicle, said probe comprising a cable, one end of which terminates in a fixing end intended to be implanted. in said catalytic converter.
  • the main characteristic of a mounting device is that it comprises a guide piece having a bent portion, the cable being adapted to come into contact with said portion to adopt the same bent profile.
  • the cable of the oxygen sensor is oriented precisely and rigorously in the engine environment, so as to adopt a non-constrained profile and repeatable over time.
  • the final assembly of the cable may possibly be effected by means of complementary fastening clips, but since the cable is already correctly positioned thanks to the guide piece, the positioning of said clips along said cable may be random. It is therefore no longer necessary to use coloring of certain areas of said cable to mark the location of the staples.
  • the guide piece can be indifferently attached to the catalytic converter or the tip of the oxygen sensor.
  • the guide piece is rigid and dimensionally stable over time.
  • the cable may come into contact with the bent portion, either over the entire length of said portion or only a portion thereof.
  • the two segments of the guide piece defining the bend are between them an angle less than or equal to 90 °.
  • the cable comes into contact with the bent portion over the entire length of said portion.
  • said cable is perfectly oriented without risk of seeing its position deviate in time.
  • This extended contact surface is a guarantee of stability of the cable.
  • the guide piece comprises a main body which is extended by the bent portion, said body being adapted to be fixed to the catalytic converter.
  • the body can indifferently be fixed next to the attachment end of the oxygen probe, or around said tip.
  • the main body at least partially envelops the tip of the oxygen probe.
  • it is the section of the cable that directly extends the attachment end which comes into contact by gripping the bent portion of the guide piece.
  • the main body and the bent portion are semi-cylindrical.
  • the guide portion is comparable to an open channel capable of receiving, stably, the cable and provide a precise orientation.
  • the bent portion defines a groove for receiving the cable.
  • the portion of the cable which is inserted into said groove is maintained with rigor in the bent portion, without risk of escaping from said portion.
  • the bent portion has a radius of curvature greater than or equal to 12 mm.
  • the guide piece is made of a material to be selected from a stamped sheet or foundry.
  • the bent portion comprises two deformable holding tabs, the contacting of the cable in the bent portion being effected by means of a forced spacing of said tabs and a loosening thereof.
  • the legs act as a holding clip.
  • These two tabs act as cable retention elements in the bent portion, and further accentuate the conditions of contact between said cable and said bent portion.
  • the guide piece is directly attached to the end piece of the probe. In this way, the guide piece can be shorter and therefore of reduced mass and bulk.
  • the invention also relates to a holding piece for producing a mounting device mentioned above.
  • a mounting device has the advantage of ensuring a rigorous and precise guidance of the cable of an oxygen sensor, while involving a space-saving guide piece with a limited mass. It also has the advantage of avoiding having to color the cable at predetermined locations thereof, to mark the precise location of the fastening clips.
  • a device makes it possible to mount an oxygen probe 1 on a catalytic converter 2 placed on an exhaust line of a heat engine 9 of a motor vehicle, said probe 1 being placed upstream of said pot 2 on said exhaust line.
  • a probe 1 is constituted by a flexible cable 3, a first end 4 ends with a plug 5 and a second end ends with a fixing end 7 to be screwed into the catalytic converter 2.
  • the tip 7 is a rigid and elongated cylindrical piece, having a hexagonal base 8. Said endpiece 7 is screwed into a wall 19 of the catalytic converter 2 so that the hexagonal base 8 is flush with said wall 19 while leaving, however, a space between them.
  • a mounting device implements a guide piece 10 intended to precisely orient the cable 3 in the environment of the engine 9.
  • This part 10 comprises a main body 11 which is extended by a bent portion 12.
  • the main body 11 is elongated and can be likened to a hollow hemicylindrical part, a first end of which consists of a circular wall 13 provided with a circular central opening 14, and a second end of which consists of a rounded circular half-wall 15
  • the bent portion 12 originates at the level of said curved circular half-wall 15 and is comparable to an open, elongated and bent gutter.
  • the cross section of this gutter is in an arc and preferably corresponds to a semicircle.
  • This bent portion 12 has a first segment 16 and a second segment 17 forming between them a predefined angle according to the environment in which the probe is moving. In order to contain the size of the probe 1, the angle formed by the first and second segments 16 and 17 may be less than or equal to 90 °. In addition, the bent portion may have a radius of curvature greater than or equal to 12mm.
  • the first segment 16 connects the curved circular half-wall 15 of the main body 11 of the guide piece 10, to the second segment 17.
  • Said second segment 17 ends with two deformable holding tabs 18, leaving a limited space between them. In other words, each tab 18 is curved and each extends an edge of the channel, so that the cross section of said channel at said tabs 18 is substantially circular, with limited space.
  • This guide piece 10 is made of stamped sheet metal or foundry.
  • the guide piece 10 extends around the tip 7 of the oxygen probe 1, so that the annular wall 13 of the first end of the body 11 is placed in the space delimited by the wall 19 of the pot 2 and the hexagonal base 8 of the tip 7.
  • the hemicylindrical shape of the body 11 allows partial overlap of said tip 7.
  • the section 20 of the cable 3 directly extending the tip 7 is placed in the bent portion 12 so as to come into contact with said portion 12 over the entire length thereof.
  • said section 20 adopts the same curvature as that of the bent portion 12.
  • the two retaining tabs 18 are released to close naturally around said section 2 of cable 3 while trying to find their original position before deformation by spacing.
  • the wall 19 of the catalytic converter 2 has two stops 21 projecting, intended to prevent rotation of the guide piece 10 around the tip 7, which may induce high stresses at the section 20 of the cable 3 placed in the bent portion 12.
  • the guide piece 10 assumes a predetermined angular position relative to the catalytic converter 2, so that the main body 11 can extend between the motor and the end piece 7 in order to protect the latter thermal radiation from the engine.
  • the cable 3 adopts an optimized path in the environment of the motor 9, to allow connection of the plug 5 in a control unit, under the best conditions.
  • a mounting device may also comprise a fastening clip 22 for hooking the cable 3 at a point of the motor 9 or equipment adjoining said motor 9. Since the cable 3 is already correctly oriented with the guide piece 10, it is no longer necessary to place said clip 22 at a very precise location of said cable 3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention se rapporte à un dispositif de montage d'une sonde (1) à oxygène sur un pot (2) catalytique d'un dispositif de dépollution d'un véhicule, ladite sonde (1) comprenant un câble (3) dont une extrémité se termine par un embout (7) de fixation destiné à être implanté dans ledit pot catalytique (2). La principale caractéristique d'un dispositif de montage selon l'invention, est qu'il comprend une pièce de guidage (10) présentant une portion coudée (12), et en ce que le câble (3) est apte à venir au contact de ladite portion (12) pour adopter le même profil coudé.The invention relates to a device for mounting an oxygen probe (1) on a catalytic pot (2) of a vehicle depollution device, said probe (1) comprising a cable (3) of which one end terminates in a fastener (7) for attachment to be implanted in said catalytic converter (2). The main characteristic of a mounting device according to the invention is that it comprises a guide piece (10) having a bent portion (12), and in that the cable (3) is adapted to come into contact with said portion (12) to adopt the same angled profile.

Description

L'invention se rapporte à un dispositif de montage d'une sonde à oxygène sur un pot catalytique de véhicule.The invention relates to a device for mounting an oxygen sensor on a catalytic converter of a vehicle.

De façon schématique, un système de dépollution d'un véhicule automobile doté d'un moteur thermique, comprend un pot catalytique monté sur une ligne d'échappement dudit moteur afin de réduire les émissions de particules polluantes. Généralement, une sonde à oxygène constituée d'un câble et d'une prise est montée en amont dudit pot catalytique afin de mesurer le taux d'oxygène et de transmettre à une unité de contrôle un signal correspondant à cette mesure. L'unité de contrôle détermine alors la proportion du mélange air/carburant pour laquelle l'efficacité du moteur est optimale, ladite efficacité se traduisant par un faible niveau des rejets de particules polluantes et éventuellement par une consommation réduite.In a schematic manner, a pollution control system of a motor vehicle equipped with a heat engine comprises a catalytic converter mounted on an exhaust line of said engine in order to reduce the emissions of polluting particles. Generally, an oxygen sensor consisting of a cable and a plug is mounted upstream of said catalytic converter in order to measure the oxygen content and to transmit to a control unit a signal corresponding to this measurement. The control unit then determines the proportion of the air / fuel mixture for which the efficiency of the engine is optimal, said efficiency resulting in a low level of discharges of polluting particles and possibly reduced consumption.

Bien souvent, les câbles de ces sondes à oxygène sont montés au moyen d'au moins une agrafe de maintien, nécessitant la présence d'au moins un repère visuel sur lesdits câbles, sous la forme d'une zone colorée. En effet, les câbles doivent être montés de manière à ce que chaque agrafe vienne se positionner au niveau d'une zone colorée précise du câble. Or, un marquage de câble est une opération contraignante et, malgré la présence d'agrafes de maintien, les câbles peuvent subir des pliures marquées rendant leur montage approximatif et fragile.Often, the cables of these oxygen probes are mounted by means of at least one holding clip, requiring the presence of at least one visual mark on said cables, in the form of a colored zone. Indeed, the cables must be mounted so that each clip comes to be positioned at a specific colored area of the cable. However, a cable marking is a restrictive operation and, despite the presence of holding clips, the cables can undergo marked bends making their assembly rough and fragile.

Les dispositifs de montage d'une sonde à oxygène sur un pot catalytique existent et ont déjà fait l'objet de brevet. On peut par exemple citer le brevet GB2468276 qui se rapporte à un tel dispositif et dont la particularité est de mettre en oeuvre une pièce de maintien allongée et rectiligne, destinée à servir de point d'ancrage du câble de la sonde à oxygène. Or, cette pièce de maintien est encombrante et sert à uniquement à soutenir le câble, sans assurer un guidage précis de celui-ci.Mounting devices of an oxygen sensor on a catalytic converter exist and have already been patented. For example, the patent can be cited GB2468276 which relates to such a device and whose particularity is to implement an elongate and rectilinear holding piece, intended to serve as an anchor point of the cable of the oxygen sensor. However, this holding piece is bulky and serves only to support the cable, without ensuring accurate guidance thereof.

Un dispositif selon l'invention permet de monter une sonde à oxygène sur un pot catalytique en s'affranchissant des inconvénients relevés dans l'état de la technique.A device according to the invention allows to mount an oxygen sensor on a catalytic converter by overcoming the disadvantages noted in the state of the art.

L'invention a pour objet un dispositif de montage d'une sonde à oxygène sur un pot catalytique d'un dispositif de dépollution d'un véhicule, ladite sonde comprenant un câble dont une extrémité se termine par un embout de fixation destiné à être implanté dans ledit pot catalytique.The subject of the invention is a device for mounting an oxygen probe on a catalytic converter of a device for the depollution of a vehicle, said probe comprising a cable, one end of which terminates in a fixing end intended to be implanted. in said catalytic converter.

La principale caractéristique d'un dispositif de montage selon l'invention, est qu'il comprend une pièce de guidage présentant une portion coudée, le câble étant apte à venir au contact de ladite portion pour adopter le même profil coudé. Autrement dit, grâce à la présence de cette pièce de guidage, le câble de la sonde à oxygène est orienté de façon précise et rigoureuse dans l'environnement du moteur, de manière à adopter un profil non contraint et répétable dans le temps. Le montage définitif du câble peut éventuellement s'effectuer au moyen d'agrafes de fixation complémentaires, mais puisque le câble est déjà correctement positionné grâce à la pièce de guidage, le positionnement desdites agrafes le long dudit câble peut être aléatoire. Il n'est donc plus nécessaire d'avoir recours à la coloration de certaines zones dudit câble pour marquer l'emplacement des agrafes. La pièce de guidage peut indifféremment être fixée au pot catalytique ou à l'embout de la sonde à oxygène. Il est supposé que la pièce de guidage est rigide et indéformable dans le temps. Le câble peut venir au contact de la portion coudée, soit sur la totalité de la longueur de ladite portion, soit sur une partie seulement de celle-ci. Avantageusement, les deux segments de la pièce de guidage définissant le coude, font entre eux un angle inférieur ou égal à 90°.The main characteristic of a mounting device according to the invention is that it comprises a guide piece having a bent portion, the cable being adapted to come into contact with said portion to adopt the same bent profile. In other words, thanks to the presence of this guide piece, the cable of the oxygen sensor is oriented precisely and rigorously in the engine environment, so as to adopt a non-constrained profile and repeatable over time. The final assembly of the cable may possibly be effected by means of complementary fastening clips, but since the cable is already correctly positioned thanks to the guide piece, the positioning of said clips along said cable may be random. It is therefore no longer necessary to use coloring of certain areas of said cable to mark the location of the staples. The guide piece can be indifferently attached to the catalytic converter or the tip of the oxygen sensor. It is assumed that the guide piece is rigid and dimensionally stable over time. The cable may come into contact with the bent portion, either over the entire length of said portion or only a portion thereof. Advantageously, the two segments of the guide piece defining the bend, are between them an angle less than or equal to 90 °.

Avantageusement, le câble vient au contact de la portion coudée sur toute la longueur de ladite portion. De cette manière, en établissant une surface de contact étendue entre le câble et la pièce de guidage, ledit câble est parfaitement orienté sans risque de voir sa position dévier dans le temps. Cette surface de contact étendue est un gage de stabilité du câble.Advantageously, the cable comes into contact with the bent portion over the entire length of said portion. In this way, by establishing an extended contact surface between the cable and the guide piece, said cable is perfectly oriented without risk of seeing its position deviate in time. This extended contact surface is a guarantee of stability of the cable.

De façon préférentielle, la pièce de guidage comprend un corps principal qui est prolongé par la portion coudée, ledit corps étant apte à être fixé au pot catalytique. Le corps peut indifféremment être fixé à côté de l'embout de fixation de la sonde à oxygène, ou autour dudit embout.Preferably, the guide piece comprises a main body which is extended by the bent portion, said body being adapted to be fixed to the catalytic converter. The body can indifferently be fixed next to the attachment end of the oxygen probe, or around said tip.

Préférentiellement, le corps principal enveloppe au moins partiellement l'embout de la sonde à oxygène. De cette manière, c'est le tronçon du câble qui prolonge directement l'embout de fixation qui vient au contact par enserrement de la portion coudée de la pièce de guidage.Preferably, the main body at least partially envelops the tip of the oxygen probe. In this way, it is the section of the cable that directly extends the attachment end which comes into contact by gripping the bent portion of the guide piece.

De façon avantageuse, le corps principal et la portion coudée sont hémicylindriques. De cette manière, la portion de guidage est assimilable à une gouttière ouverte apte à recevoir, de façon stable, le câble et lui assurer une orientation précise.Advantageously, the main body and the bent portion are semi-cylindrical. In this way, the guide portion is comparable to an open channel capable of receiving, stably, the cable and provide a precise orientation.

Avantageusement, la portion coudée définit une gorge destinée à recevoir le câble. De cette manière, le tronçon du câble qui vient s'insérer dans ladite gorge est maintenu avec rigueur dans la portion coudée, sans risque de s'échapper de ladite portion.Advantageously, the bent portion defines a groove for receiving the cable. In this way, the portion of the cable which is inserted into said groove is maintained with rigor in the bent portion, without risk of escaping from said portion.

De façon préférentielle, la portion coudée possède un rayon de courbure supérieur ou égal à 12 mm.Preferably, the bent portion has a radius of curvature greater than or equal to 12 mm.

Préférentiellement, la pièce de guidage est fabriquée dans un matériau à choisir parmi une tôle emboutie ou de la fonderie.Preferably, the guide piece is made of a material to be selected from a stamped sheet or foundry.

De façon avantageuse, la portion coudée comprend deux pattes de maintien déformables, la mise au contact du câble dans la portion coudée s'effectuant au moyen d'un écartement forcé desdites pattes puis d'un relâchement de celles-ci. De cette manière, en se refermant naturellement autour du câble en tentant de retrouver leur position d'origine, les pattes agissent comme une pince de maintien. Ces deux pattes agissent comme des éléments de retenue du câble dans la portion coudée, et accentuent davantage encore les conditions de contact entre ledit câble et ladite portion coudée.Advantageously, the bent portion comprises two deformable holding tabs, the contacting of the cable in the bent portion being effected by means of a forced spacing of said tabs and a loosening thereof. In this way, by closing naturally around the cable while trying to find their original position, the legs act as a holding clip. These two tabs act as cable retention elements in the bent portion, and further accentuate the conditions of contact between said cable and said bent portion.

Selon un autre mode de réalisation préféré d'un dispositif de montage selon l'invention, la pièce de guidage est directement fixée à l'embout de la sonde. De cette manière, la pièce de guidage peut être plus courte et donc d'une masse et d'un encombrement réduits.According to another preferred embodiment of a mounting device according to the invention, the guide piece is directly attached to the end piece of the probe. In this way, the guide piece can be shorter and therefore of reduced mass and bulk.

L'invention a également pour objet une pièce de maintien pour la réalisation d'un dispositif de montage susmentionné.The invention also relates to a holding piece for producing a mounting device mentioned above.

Un dispositif de montage selon l'invention présente l'avantage d'assurer un guidage rigoureux et précis du câble d'une sonde à oxygène, tout en impliquant une pièce de guidage peu encombrante et d'une masse limitée. Il a de plus l'avantage d'éviter d'avoir à colorer le câble à des endroits prédéterminés de celui-ci, pour marquer l'emplacement précis des agrafes de fixation.A mounting device according to the invention has the advantage of ensuring a rigorous and precise guidance of the cable of an oxygen sensor, while involving a space-saving guide piece with a limited mass. It also has the advantage of avoiding having to color the cable at predetermined locations thereof, to mark the precise location of the fastening clips.

On donne, ci-après, une description détaillée de deux modes de réalisation préférés d'un dispositif de montage selon l'invention, en se référant aux figures 1A à 4.

  • La figure 1A est une vue en perspective d'un pot catalytique et d'une sonde à oxygène montée sur ledit pot au moyen d'un premier mode de réalisation préféré d'un dispositif selon l'invention,
  • La figure 1B est une vue en perspective d'un pot catalytique et d'une sonde à oxygène montée sur ledit pot au moyen d'un deuxième mode de réalisation préféré d'un dispositif selon l'invention,
  • La figure 2 est une vue en perspective d'une pièce de guidage d'un dispositif de montage selon l'invention,
  • La figure 3 est une vue agrandie d'une pièce de guidage et du câble de la sonde à oxygène au contact de ladite pièce,
  • La figure 4 est une vue en perspective agrandie d'une pièce de guidage et du câble de la sonde à oxygène au contact de ladite pièce.
The following is a detailed description of two preferred embodiments of a mounting device according to the invention, with reference to Figures 1A to 4 .
  • The Figure 1A is a perspective view of a catalytic converter and an oxygen sensor mounted on said pot by means of a first preferred embodiment of a device according to the invention,
  • The Figure 1B is a perspective view of a catalytic converter and an oxygen sensor mounted on said pot by means of a second preferred embodiment of a device according to the invention,
  • The figure 2 is a perspective view of a guide piece of a mounting device according to the invention,
  • The figure 3 is an enlarged view of a guide piece and the cable of the oxygen probe in contact with said piece,
  • The figure 4 is an enlarged perspective view of a guide piece and the cable of the oxygen sensor in contact with said piece.

En se référant aux figures 1A et 1B, un dispositif selon l'invention permet de monter une sonde 1 à oxygène sur un pot catalytique 2 placé sur une ligne d'échappement d'un moteur thermique 9 d'un véhicule automobile, ladite sonde 1 étant placée en amont dudit pot 2 sur ladite ligne d'échappement. Schématiquement, une telle sonde 1 est constituée par un câble souple 3 dont une première extrémité 4 se termine par une fiche 5 et dont une deuxième extrémité se termine par un embout 7 de fixation destiné à être vissé dans le pot catalytique 2.Referring to Figures 1A and 1B a device according to the invention makes it possible to mount an oxygen probe 1 on a catalytic converter 2 placed on an exhaust line of a heat engine 9 of a motor vehicle, said probe 1 being placed upstream of said pot 2 on said exhaust line. Schematically, such a probe 1 is constituted by a flexible cable 3, a first end 4 ends with a plug 5 and a second end ends with a fixing end 7 to be screwed into the catalytic converter 2.

Comme l'indiquent les figures 1A, 1B, 3 et 4, l'embout 7 est une pièce cylindrique rigide et allongée, possédant une embase hexagonale 8. Ledit embout 7 est vissé dans une paroi 19 du pot catalytique 2 de sorte que l'embase hexagonale 8 affleure ladite paroi 19 en laissant toutefois subsister un espace entre eux.As indicated by Figures 1A , 1B , 3 and 4 , the tip 7 is a rigid and elongated cylindrical piece, having a hexagonal base 8. Said endpiece 7 is screwed into a wall 19 of the catalytic converter 2 so that the hexagonal base 8 is flush with said wall 19 while leaving, however, a space between them.

En se référant à la figure 2, un dispositif de montage selon l'invention, met en oeuvre une pièce de guidage 10 destinée à orienter précisément le câble 3 dans l'environnement du moteur 9. Cette pièce 10 comprend un corps principal 11 qui est prolongé par une portion coudée 12. Le corps principal 11 est allongé et est assimilable à une pièce hémicylindrique creuse, dont une première extrémité est constituée par une paroi circulaire 13 dotée d'une ouverture centrale 14 circulaire, et dont une deuxième extrémité est constituée par une demi-paroi circulaire bombée 15. La portion coudée 12 prend naissance au niveau de ladite demi-paroi circulaire bombée 15 et est assimilable à une gouttière ouverte, allongée et coudée. Autrement dit, la section transversale de cette gouttière est en arc de cercle et correspond préférentiellement à un demi-cercle. Cette portion coudée 12 présente un premier segment 16 et un deuxième segment 17 faisant entre eux un angle prédéfini selon l'environnement dans lequel évolue la sonde. Afin de contenir l'encombrement de la sonde 1, l'angle formé par les premier et second segments 16 et 17 peut être inférieur ou égal à 90°. En outre, la portion coudée peut posséder un rayon de courbure supérieur ou égal à 12mm. Le premier segment 16 relie la demi-paroi circulaire bombée 15 du corps 11 principal de la pièce de guidage 10, au deuxième segment 17. Ledit deuxième segment 17 se termine par deux pattes 18 de maintien déformables, laissant subsister entre elles un espace limité. Autrement dit, chaque patte 18 est incurvée et prolonge chacune un bord de la gouttière, de sorte que la section transversale de ladite gouttière au niveau desdites pattes 18 est sensiblement circulaire, à l'espace limité près. Cette pièce de guidage 10 est réalisée en tôle emboutie ou en fonderie.Referring to the figure 2 , a mounting device according to the invention implements a guide piece 10 intended to precisely orient the cable 3 in the environment of the engine 9. This part 10 comprises a main body 11 which is extended by a bent portion 12. The main body 11 is elongated and can be likened to a hollow hemicylindrical part, a first end of which consists of a circular wall 13 provided with a circular central opening 14, and a second end of which consists of a rounded circular half-wall 15 The bent portion 12 originates at the level of said curved circular half-wall 15 and is comparable to an open, elongated and bent gutter. In other words, the cross section of this gutter is in an arc and preferably corresponds to a semicircle. This bent portion 12 has a first segment 16 and a second segment 17 forming between them a predefined angle according to the environment in which the probe is moving. In order to contain the size of the probe 1, the angle formed by the first and second segments 16 and 17 may be less than or equal to 90 °. In addition, the bent portion may have a radius of curvature greater than or equal to 12mm. The first segment 16 connects the curved circular half-wall 15 of the main body 11 of the guide piece 10, to the second segment 17. Said second segment 17 ends with two deformable holding tabs 18, leaving a limited space between them. In other words, each tab 18 is curved and each extends an edge of the channel, so that the cross section of said channel at said tabs 18 is substantially circular, with limited space. This guide piece 10 is made of stamped sheet metal or foundry.

En se référant aux figures 1A, 1B et 4, la pièce de guidage 10 s'étend autour de l'embout 7 de la sonde 1 à oxygène, de manière à ce que la paroi annulaire 13 de la première extrémité du corps 11 soit placée dans l'espace délimité par la paroi 19 du pot 2 et l'embase hexagonale 8 de l'embout 7. La forme hémicylindrique du corps 11 permet un recouvrement partiellement dudit embout 7.Referring to Figures 1A , 1B and 4 , the guide piece 10 extends around the tip 7 of the oxygen probe 1, so that the annular wall 13 of the first end of the body 11 is placed in the space delimited by the wall 19 of the pot 2 and the hexagonal base 8 of the tip 7. The hemicylindrical shape of the body 11 allows partial overlap of said tip 7.

En se référant à la figure 3, le tronçon 20 du câble 3 prolongeant directement l'embout 7 est placé dans la portion coudée 12 de manière à venir au contact de ladite portion 12 sur toute la longueur de celle-ci. Ainsi, ledit tronçon 20 adopte la même courbure que celle de la portion coudée 12. Pour placer ce tronçon 20 dans la portion coudée 12, il faut écarter les deux pattes 18 de maintien déformables du deuxième segment 17 de la portion incurvée 12. Une fois ledit tronçon 20 correctement positionné dans ladite portion coudée 12, les deux pattes 18 de maintien sont relâchées pour se refermer naturellement autour dudit tronçon 2 de câble 3 en tentant de retrouver leur position d'origine d'avant déformation par écartement.Referring to the figure 3 , the section 20 of the cable 3 directly extending the tip 7 is placed in the bent portion 12 so as to come into contact with said portion 12 over the entire length thereof. Thus, said section 20 adopts the same curvature as that of the bent portion 12. To place this section 20 in the bent portion 12, it is necessary to separate the two deformable holding tabs 18 of the second segment 17 of the curved portion 12. Once said section 20 correctly positioned in said bent portion 12, the two retaining tabs 18 are released to close naturally around said section 2 of cable 3 while trying to find their original position before deformation by spacing.

En se référant à la figure 4, la paroi 19 du pot catalytique 2 présente deux butées 21 en saillie, destinées à empêcher une rotation de la pièce de guidage 10 autour de l'embout 7, qui risquerait d'induire de fortes contraintes au niveau du tronçon 20 du câble 3 placé dans la portion coudée 12.Referring to the figure 4 , the wall 19 of the catalytic converter 2 has two stops 21 projecting, intended to prevent rotation of the guide piece 10 around the tip 7, which may induce high stresses at the section 20 of the cable 3 placed in the bent portion 12.

Du fait en outre des butées 21 anti-rotation, la pièce de guidage 10 prend une position angulaire prédéterminée relativement au pot catalytique 2, de telle façon que le corps principale 11 puisse s'étendre entre le moteur et l'embout 7 afin de protéger ce dernier des radiations thermiques du moteur.Furthermore, because of anti-rotation stops 21, the guide piece 10 assumes a predetermined angular position relative to the catalytic converter 2, so that the main body 11 can extend between the motor and the end piece 7 in order to protect the latter thermal radiation from the engine.

Grâce à cette pièce de guidage 10, le câble 3 adopte un trajet optimisé dans l'environnement du moteur 9, pour permettre une connexion de la fiche 5 dans une unité de contrôle, dans les meilleures conditions.With this guide piece 10, the cable 3 adopts an optimized path in the environment of the motor 9, to allow connection of the plug 5 in a control unit, under the best conditions.

En se référant à la figure 1B, un dispositif de montage selon l'invention peut également comprendre une agrafe de fixation 22 pour accrocher le câble 3 en un point du moteur 9 ou à un équipement attenant audit moteur 9. Puisque le câble 3 est déjà correctement orienté avec la pièce de guidage 10, il n'est plus nécessaire de placer ladite agrafe 22 à un endroit très précis dudit câble 3.Referring to the Figure 1B , a mounting device according to the invention may also comprise a fastening clip 22 for hooking the cable 3 at a point of the motor 9 or equipment adjoining said motor 9. Since the cable 3 is already correctly oriented with the guide piece 10, it is no longer necessary to place said clip 22 at a very precise location of said cable 3.

Claims (9)

Dispositif de montage d'une sonde (1) à oxygène sur un pot (2) catalytique d'un dispositif de dépollution d'un véhicule, ladite sonde (1) comprenant un câble (3) dont une extrémité se termine par un embout (7) de fixation destiné à être implanté dans ledit pot catalytique (2), ledit dispositif comprenant une pièce de guidage (10) présentant une portion coudée (12) et le câble (3) étant apte à venir au contact de ladite portion (12) pour adopter le même profil coudé, caractérisé en ce que la pièce de guidage (10) comprend un corps principal (11) qui est prolongé par la portion coudée (12), et en ce que ledit corps (11) est apte à être fixé au pot catalytique (2).Device for mounting an oxygen probe (1) on a catalytic pot (2) of a vehicle pollution control device, said probe (1) comprising a cable (3), one end of which terminates in a nozzle ( 7) intended to be implanted in said catalytic converter (2), said device comprising a guide piece (10) having a bent portion (12) and the cable (3) being adapted to come into contact with said portion (12). ) to adopt the same bent profile, characterized in that the guide piece (10) comprises a main body (11) which is extended by the bent portion (12), and in that said body (11) is adapted to be attached to the catalytic converter (2). Dispositif selon la revendication 1, caractérisé en ce que le câble (3) vient au contact de la portion coudée (12) sur toute la longueur de ladite portion (12).Device according to claim 1, characterized in that the cable (3) comes into contact with the bent portion (12) over the entire length of said portion (12). Dispositif selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le corps principal (11) enveloppe au moins partiellement l'embout (7) de la sonde (1) à oxygène.Device according to any one of claims 1 or 2, characterized in that the main body (11) at least partially envelops the tip (7) of the oxygen probe (1). Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le corps principal (11) et la portion coudée (12) sont hémicylindriques.Device according to any one of claims 1 to 3, characterized in that the main body (11) and the bent portion (12) are semi-cylindrical. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la portion coudée (12) définit une gorge destinée à recevoir le câble (3, 20).Device according to any one of claims 1 to 4, characterized in that the bent portion (12) defines a groove for receiving the cable (3, 20). Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la portion coudée (12) possède un rayon de courbure supérieur ou égal à 12 mm.Device according to any one of claims 1 to 5, characterized in that the bent portion (12) has a radius of curvature greater than or equal to 12 mm. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la pièce de guidage (10) est fabriquée dans un matériau à choisir parmi une tôle emboutie ou de la fonderie.Device according to one of Claims 1 to 6, characterized in that the guide piece (10) is made of choose from a stamped sheet metal or foundry. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la portion coudée (12) comprend deux pattes (18) de maintien déformables, et en ce que la mise au contact du câble (3, 20) dans la portion coudée (12) s'effectue au moyen d'un écartement forcé desdites pattes puis d'un relâchement de celles-ci.Device according to any one of claims 1 to 7, characterized in that the bent portion (12) comprises two deformable holding tabs (18), and in that the contacting of the cable (3, 20) in the portion bent (12) is effected by means of a forced spacing of said tabs and a loosening thereof. Pièce de guidage (10) pour la réalisation d'un dispositif de montage selon l'une quelconque des revendications 1 à 8.Guide piece (10) for producing a mounting device according to one of Claims 1 to 8.
EP15199280.7A 2014-12-15 2015-12-10 Device for mounting an oxygen probe on a vehicle catalytic converter Active EP3034824B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1462454A FR3029975A1 (en) 2014-12-15 2014-12-15 DEVICE FOR MOUNTING AN OXYGEN PROBE ON A CATALYTIC VEHICLE POT

Publications (2)

Publication Number Publication Date
EP3034824A1 true EP3034824A1 (en) 2016-06-22
EP3034824B1 EP3034824B1 (en) 2018-10-03

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EP15199280.7A Active EP3034824B1 (en) 2014-12-15 2015-12-10 Device for mounting an oxygen probe on a vehicle catalytic converter

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EP (1) EP3034824B1 (en)
FR (1) FR3029975A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080078165A1 (en) * 2006-10-02 2008-04-03 Sangbeom Kim Close-coupled catalytic converter
GB2468276A (en) 2009-02-24 2010-09-08 Gm Global Tech Operations Inc Assembly for mounting a sensor on a component of an automotive vehicle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2984409B1 (en) * 2011-12-16 2014-01-10 Renault Sa OPERATING SAFETY DEVICE OF A CATALYTIC POT SCREEN

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080078165A1 (en) * 2006-10-02 2008-04-03 Sangbeom Kim Close-coupled catalytic converter
GB2468276A (en) 2009-02-24 2010-09-08 Gm Global Tech Operations Inc Assembly for mounting a sensor on a component of an automotive vehicle

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FR3029975A1 (en) 2016-06-17
EP3034824B1 (en) 2018-10-03

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