EP3034824B1 - Vorrichtung zur montage einer sauerstoffsonde auf einem katalysator eines fahrzeugs - Google Patents

Vorrichtung zur montage einer sauerstoffsonde auf einem katalysator eines fahrzeugs Download PDF

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Publication number
EP3034824B1
EP3034824B1 EP15199280.7A EP15199280A EP3034824B1 EP 3034824 B1 EP3034824 B1 EP 3034824B1 EP 15199280 A EP15199280 A EP 15199280A EP 3034824 B1 EP3034824 B1 EP 3034824B1
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EP
European Patent Office
Prior art keywords
cable
bent portion
catalytic converter
guide piece
contact
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.)
Active
Application number
EP15199280.7A
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English (en)
French (fr)
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EP3034824A1 (de
Inventor
Pascal Hottebart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
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Renault SAS
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Publication date
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Publication of EP3034824A1 publication Critical patent/EP3034824A1/de
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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.
  • US2008 / 078165-A1 discloses a guide piece having a bent portion against which the cable of a probe is adapted to come into contact to adopt the same bent profile.
  • 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 mounting device 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 intended to at least partially wrap the tip of the oxygen sensor, the main body being 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. 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.
  • 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.
  • 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 of which terminates in a plug 5 and a second end of which terminates in a fixing end 7 intended 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 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 hanging 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.

Landscapes

  • 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)

Claims (7)

  1. Vorrichtung zur Montage einer Sauerstoffsonde (1) auf einem Katalysator (2) einer Reinigungsvorrichtung eines Fahrzeugs, wobei die Sonde (1) ein Kabel (3) umfasst, dessen eines Ende mit einem Befestigungsendstück (7) endet, das dazu bestimmt ist, in dem Katalysator (2) angeordnet zu werden, wobei die Vorrichtung ein Führungsstück (10) umfasst, das einen gebogenen Abschnitt (12) aufweist, der dazu bestimmt ist, mit dem Kabel (3) in Kontakt zu gelangen, um das gleiche gebogene Profil anzunehmen, dadurch gekennzeichnet, dass das Führungsstück (10) einen Hauptkörper (11) umfasst, der dazu bestimmt ist, das Endstück (7) der Sauerstoffsonde (1) zumindest teilweise zu umhüllen, wobei der Hauptkörper (11) durch den gebogenen Abschnitt (12) verlängert wird, und dass der Körper (11) geeignet ist, an dem Katalysator (2) befestigt zu werden.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Kabel (3) mit dem gebogenen Abschnitt (12) über die gesamte Länge des Abschnitts (12) in Kontakt gelangt.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Hauptkörper (11) und der gebogene Abschnitt (12) halbzylinderförmig sind.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der gebogene Abschnitt (12) eine Nut definiert, die dazu bestimmt ist, das Kabel (3, 20) aufzunehmen.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der gebogene Abschnitt (12) einen Krümmungsradius größer oder gleich 12 mm besitzt.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Führungsstück (10) aus einem Material gefertigt ist, das unter tiefgezogenem Blech oder Guss gewählt ist.
  7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der gebogene Abschnitt (12) zwei verformbare Haltelappen (18) umfasst und dass das Kontaktieren des Kabels (3, 20) in dem gebogenen Abschnitt (12) durch Auseinanderdrücken der Lappen und anschließendes Loslassen der Lappen erfolgt.
EP15199280.7A 2014-12-15 2015-12-10 Vorrichtung zur montage einer sauerstoffsonde auf einem katalysator eines fahrzeugs Active EP3034824B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1462454A FR3029975A1 (fr) 2014-12-15 2014-12-15 Dispositif de montage d'une sonde a oxygene sur un pot catalytique de vehicule

Publications (2)

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

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EP15199280.7A Active EP3034824B1 (de) 2014-12-15 2015-12-10 Vorrichtung zur montage einer sauerstoffsonde auf einem katalysator eines fahrzeugs

Country Status (2)

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EP (1) EP3034824B1 (de)
FR (1) FR3029975A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013087551A1 (fr) * 2011-12-16 2013-06-20 Renault S.A.S. Dispositif de securite de fonctionnement d'un ecran de pot catalytique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100805439B1 (ko) * 2006-10-02 2008-02-20 현대자동차주식회사 통합형 ｃｃｃ 촉매 장치
GB2468276B (en) * 2009-02-24 2013-06-12 Gm Global Tech Operations Inc An assembly for mounting a sensor on a component of an automotive vehicle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013087551A1 (fr) * 2011-12-16 2013-06-20 Renault S.A.S. Dispositif de securite de fonctionnement d'un ecran de pot catalytique

Also Published As

Publication number Publication date
FR3029975A1 (fr) 2016-06-17
EP3034824A1 (de) 2016-06-22

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