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WO2015086971A1 - Heat protection screen for an exhaust gas outlet device of a motor vehicle - Google Patents

Heat protection screen for an exhaust gas outlet device of a motor vehicle Download PDF

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Publication number
WO2015086971A1
WO2015086971A1 PCT/FR2014/053205 FR2014053205W WO2015086971A1 WO 2015086971 A1 WO2015086971 A1 WO 2015086971A1 FR 2014053205 W FR2014053205 W FR 2014053205W WO 2015086971 A1 WO2015086971 A1 WO 2015086971A1
Authority
WO
WIPO (PCT)
Prior art keywords
radius
protection screen
thermal protection
duct
wall
Prior art date
Application number
PCT/FR2014/053205
Other languages
French (fr)
Inventor
Tony VIEIRA
Gilbert VRY
Bertrand Devaux
Original Assignee
Renault S.A.S.
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 Renault S.A.S. filed Critical Renault S.A.S.
Publication of WO2015086971A1 publication Critical patent/WO2015086971A1/en

Links

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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • 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
    • F01N13/14—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 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F01N13/143—Double-walled exhaust pipes or housings with air filling the space between both walls
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/20—Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing

Definitions

  • the invention relates to a thermal protection screen for partially enclosing a motor vehicle exhaust gas outlet duct and having a shell shape that can be arranged at a distance from the duct.
  • the exhaust line of a motor vehicle emits heat when the engine is running. To prevent the environment close to the exhaust line is deteriorated by this heat, it is known to use screens for thermally isolating the exhaust line.
  • the exhaust line may have different diameter pipes, which then requires to provide a different screen adapted to each pipe diameter.
  • the subject of the invention is a simple and inexpensive thermal protection screen, which can be used on conduits of different diameters and which allows different modes of attachment.
  • the invention proposes a thermal protection screen of the type mentioned above, characterized in that the thermal protection screen comprises at least one zone for fixing it to the duct according to several modes, the fixing zone being formed by a tightening of the wall of the shell forming a transverse groove, the bottom of the groove having a central portion delimited by longitudinal edges and having a semi-circular profile of radius, the fixing zone being able to cooperate indifferently with two ducts of different radii, the radius being greater than the radius.
  • the longitudinal edges of the semicircular portion of the fastening zone are able to come into contact with the wall of a duct of radius R ', the surface of the semicircular portion situated between the longitudinal edges being at a distance from the duct wall.
  • the thermal protection screen is adapted to be fixed to the radius duct R, R 'by means of weld beads capable of being deposited between the semicircular portion of the fastening zone and the wall of the radius duct R, R '.
  • the heat protection screen is adapted to be fixed to the radius duct R, R 'through a flexible collar adapted to be received in openings in the longitudinal edges of the central portion of the fixing area .
  • the radius R is equal to 22.5 millimeters.
  • FIG. 1 is a general perspective view of an exhaust gas outlet device comprising a heat shield according to the invention.
  • FIG. 2 is a cross-sectional view of an arrangement of a heat shield on an exhaust gas outlet device conduit in a first configuration.
  • FIG. 3 is a cross-sectional view of an arrangement of a heat shield on an exhaust gas outlet device conduit in a second configuration.
  • FIG. 4 is a perspective view of a heat shield represented in a first mode of fixing
  • FIG. 5 is a perspective view of a heat shield shown in a second mode of attachment.
  • an exhaust gas outlet device 10 comprises a first duct 12 of diameter R and a second duct 12 'of diameter R', the radius R 'being greater than the radius R.
  • the radius R is of the order of 22.5 millimeters while the radius R 'is of the order of 25 millimeters.
  • a thermal shield 14 having a shell shape is disposed on the exhaust device so as to surround, remotely, the conduits 12 and 12 '.
  • the screen 14 comprises two zones 16 of reduced section in which the wall of the screen 14 tightens towards the duct 12 and the duct 12 'forming a groove 17 of substantially transverse orientation in shell.
  • Figures 2 and 3 show a section of the attachment zone 16 of the exhaust gas outlet device 10 respectively in a region A and in a region B of the heat shield 14.
  • the bottom of the groove 17 has a central portion 18 delimited by longitudinal edges 20 and having an arcuate profile of radius R.
  • the length of the central portion 18 in an arc is of the order of 29 millimeters.
  • the arcuate part then extends on either side from the edges 20 by two lateral wings 19.
  • the areas of reduced section 16 form zones for fixing the screen 14 to an exhaust gas outlet device 10.
  • the screen 14 may comprise several attachment zones, depending on the architecture of the device 10.
  • the attachment zone 16 cooperates with the duct 12 of radius R equal to the radius of the arcuate portion 18 of the bottom of the groove 17.
  • the entire surface of the arcuate portion of the groove circle 18 of the fixing zone is then in contact with the wall of the duct 12.
  • the wings 19 extend at a distance from the wall of the duct 12.
  • the attachment zone 16 of the screen 14 cooperates with the duct 12 'of radius R'.
  • the arcuate portion 18 of the attachment zone 16 is then not fully in contact with the wall of the duct 12 '. Only the longitudinal edges 20 of the central portion 18 are in contact with the wall of the duct 12 '.
  • the contact between the screen 14 and the duct 12 ' is linear, the screen 14 being about 1 mm apart from the duct 12' between the longitudinal edges 20.
  • the wings 19 extend away from the wall of the duct 12 '.
  • attachment zones 16 although identical, can however cooperate with the two ducts 12 and 12 'of different diameters
  • the screen 14 is fixed by means of a clamping collar 22 adapted to be passed through orifices 24 formed at the longitudinal edges 20 of the central portion.
  • the dimensions of the orifices are of the order of 12 millimeters by 8 millimeters.
  • the collar 22 is thus disposed over the arcuate portion 18 and its ends are inserted inside the orifices 24 so that they pass under the edges 20. The ends are then attached together under the conduit 12 (not shown).
  • the screen 14 is fixed by means of welding beads 26 deposited between the screen and the wall of the duct, at a longitudinal edge 240 of the orifices 24.
  • the welding beads are arranged the same way regardless of the diameter of the duct.
  • the heat shield 14 according to the invention can be fixed on two ducts of different diameters and in two different ways so as to adapt to the architectural constraints of the exhaust line without generating differences in thermal screens.
  • the heat shield according to the invention can also be fixed on a duct whose diameter does not vary.
  • the heat shield according to the invention can be fixed according to a single fastening means (collar or weld points) in all its attachment zones.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

A heat protection screen (14) intended to partially surround a pipe (12, 12') of an exhaust gas outlet device of a motor vehicle and having the form of a shell suitable for being arranged at a distance from the pipe (12, 12'), characterised in that the heat protection screen (14) comprises at least one attachment area (16) for attaching same to the pipe (12, 12') in a plurality of modes, the attachment area (16) being formed by a narrowing in the wall of the shell forming a transverse groove (17), the bottom of the groove (17) having a central portion (18) delimited by longitudinal edges (20) and having a semi-circular radial profile (R), the attachment area (16) being capable of engaging equally with two pipes of different radii (R, R'), radius (R') being greater than radius (R).

Description

ECRAN DE PROTECTION THERMIQUE POUR DISPOSITIF DE SORTIE DE GAZ THERMAL PROTECTION SCREEN FOR GAS OUTPUT DEVICE
D'ECHAPPEMENT DE VEHICULE AUTOMOBILE EXHAUST OF MOTOR VEHICLE
L'invention concerne un écran de protection thermique destiné à entourer partiellement un conduit de dispositif de sortie de gaz d'échappement de véhicule automobile et présentant une forme de coque apte à être disposée à distance du conduit. The invention relates to a thermal protection screen for partially enclosing a motor vehicle exhaust gas outlet duct and having a shell shape that can be arranged at a distance from the duct.
La ligne d'échappement d'un véhicule automobile émet de la chaleur lorsque le moteur est en fonctionnement. Afin d'éviter que l'environnement proche de la ligne d'échappement ne soit détérioré par cette chaleur, il est connu d'utiliser des écrans permettant d'isoler thermiquement la ligne d'échappement. The exhaust line of a motor vehicle emits heat when the engine is running. To prevent the environment close to the exhaust line is deteriorated by this heat, it is known to use screens for thermally isolating the exhaust line.
Selon la configuration du véhicule, il peut être nécessaire de fixer l'écran thermique directement sur le conduit de la ligne d'échappement. Cependant, en fonction des contraintes de motorisation ou acoustiques, la ligne d'échappement peut présenter des conduits de diamètre différents, ce qui nécessite alors de prévoir un écran différent adapté à chaque diamètre de conduit. Outre ces diversités de diamètres de conduit, il peut aussi y avoir des diversités concernant les moyens de fixation sur le conduit, en fonction, par exemple, des usines de montage. Depending on the configuration of the vehicle, it may be necessary to attach the heat shield directly to the line of the exhaust line. However, depending on the motorization or acoustic constraints, the exhaust line may have different diameter pipes, which then requires to provide a different screen adapted to each pipe diameter. In addition to these differences in pipe diameters, there may also be differences in the means of attachment to the conduit, depending, for example, on the assembly plants.
Afin de pallier ces inconvénients, l'invention a pour objet un écran de protection thermique simple et peu onéreux, qui puisse être utilisé sur des conduits de diamètres différents et qui permette des modes de fixation différents. In order to overcome these disadvantages, the subject of the invention is a simple and inexpensive thermal protection screen, which can be used on conduits of different diameters and which allows different modes of attachment.
A cet effet, l'invention propose un écran de protection thermique du type cité ci- dessus, caractérisé en ce que l'écran de protection thermique comporte au moins une zone pour sa fixation au conduit selon plusieurs modes, la zone de fixation étant formée par un resserrement de la paroi de la coque formant une rainure transversale, le fond de la rainure présentant une partie centrale délimitée par des bords longitudinaux et présentant un profil semi-circulaire de rayon, la zone de fixation étant apte à coopérer indifféremment avec deux conduits de rayons différents, le rayon étant supérieur au rayon. For this purpose, the invention proposes a thermal protection screen of the type mentioned above, characterized in that the thermal protection screen comprises at least one zone for fixing it to the duct according to several modes, the fixing zone being formed by a tightening of the wall of the shell forming a transverse groove, the bottom of the groove having a central portion delimited by longitudinal edges and having a semi-circular profile of radius, the fixing zone being able to cooperate indifferently with two ducts of different radii, the radius being greater than the radius.
Selon d'autres caractéristiques de l'invention: - La partie semi circulaire de la zone de fixation est apte à entrer en contact dans sa totalité avec la paroi d'un conduit de rayon R. According to other features of the invention: - The semi circular part of the fastening zone is able to come into contact in its entirety with the wall of a conduit of radius R.
- Les bords longitudinaux de la partie semi-circulaire de la zone de fixation sont aptes à venir en contact avec la paroi d'un conduit de rayon R', la surface de la partie semi circulaire située entre les bords longitudinaux étant à distance de la paroi du conduit.  The longitudinal edges of the semicircular portion of the fastening zone are able to come into contact with the wall of a duct of radius R ', the surface of the semicircular portion situated between the longitudinal edges being at a distance from the duct wall.
- L'écran de protection thermique est apte à être fixé au conduit de rayon R,R' par l'intermédiaire de cordons de soudure aptes à être déposés entre la partie semi- circulaire de la zone de fixation et la paroi du conduit de rayon R,R'.  - The thermal protection screen is adapted to be fixed to the radius duct R, R 'by means of weld beads capable of being deposited between the semicircular portion of the fastening zone and the wall of the radius duct R, R '.
- L'écran thermique de protection est apte à être fixé au conduit de rayon R,R' par l'intermédiaire d'un collier souple apte à être reçu dans des ouvertures ménagées dans les bords longitudinaux de la partie centrale de la zone de fixation.  - The heat protection screen is adapted to be fixed to the radius duct R, R 'through a flexible collar adapted to be received in openings in the longitudinal edges of the central portion of the fixing area .
- Le rayon R est égal à 22,5 millimètres.  - The radius R is equal to 22.5 millimeters.
- Le rayon R' est égal à 25 millimètres.  - The radius R 'is equal to 25 millimeters.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description d'exemples de réalisation d'un écran de protection thermique en référence aux dessins annexés dans lesquels : Other characteristics and advantages of the invention will become apparent on reading the description of exemplary embodiments of a thermal protection screen with reference to the appended drawings in which:
- La figure 1 est une vue générale en perspective d'un dispositif de sortie de gaz d'échappement comportant un écran thermique selon l'invention. - Figure 1 is a general perspective view of an exhaust gas outlet device comprising a heat shield according to the invention.
- La figure 2 est une vue en coupe transversale d'un agencement d'un écran thermique sur un conduit de dispositif de sortie de gaz d'échappement selon une première configuration. FIG. 2 is a cross-sectional view of an arrangement of a heat shield on an exhaust gas outlet device conduit in a first configuration.
- La figure 3 est une vue en coupe transversale d'un agencement d'un écran thermique sur un conduit de dispositif de sortie de gaz d'échappement selon une deuxième configuration. FIG. 3 is a cross-sectional view of an arrangement of a heat shield on an exhaust gas outlet device conduit in a second configuration.
- La figure 4 est une vue en perspective d'un écran thermique représenté dans un premier mode de fixation FIG. 4 is a perspective view of a heat shield represented in a first mode of fixing
- La figure 5 est une vue en perspective d'un écran thermique représenté dans un deuxième mode de fixation. - Figure 5 is a perspective view of a heat shield shown in a second mode of attachment.
Dans la description qui suit, nous prendrons à titre non limitatif une orientation longitudinale, verticale et transversale indiquée par le trièdre L,V,T des figures 1 à 5. Des éléments identiques ou analogues sont désignés par les mêmes chiffres de référence. In the description which follows, we will take nonlimitingly a longitudinal, vertical and transverse orientation indicated by the trihedron L, V, T of Figures 1 to 5. Identical or similar elements are designated by the same reference numerals.
Tel que représenté à la figure 1 , un dispositif de sortie de gaz d'échappement 10 comporte un premier conduit 12 de diamètre R et un deuxième conduit 12' de diamètre R', le rayon R' étant supérieur au rayon R. Le rayon R est de l'ordre de 22.5 millimètres tandis que le rayon R' est de l'ordre de 25 millimètres. Un écran de protection thermique 14 présentant une forme de coque est disposé sur le dispositif d'échappement de façon à entourer, à distance, les conduits 12 et 12'. As represented in FIG. 1, an exhaust gas outlet device 10 comprises a first duct 12 of diameter R and a second duct 12 'of diameter R', the radius R 'being greater than the radius R. The radius R is of the order of 22.5 millimeters while the radius R 'is of the order of 25 millimeters. A thermal shield 14 having a shell shape is disposed on the exhaust device so as to surround, remotely, the conduits 12 and 12 '.
Tel que représenté à la figure 1 l'écran 14 comporte deux zones 16 de section réduite dans lesquelles la paroi de l'écran 14 se resserre en direction du conduit 12 et du conduit 12' en formant une rainure 17 d'orientation sensiblement transversale dans la coque. As shown in FIG. 1, the screen 14 comprises two zones 16 of reduced section in which the wall of the screen 14 tightens towards the duct 12 and the duct 12 'forming a groove 17 of substantially transverse orientation in shell.
Les figures 2 et 3 représentent une coupe de la zone de fixation 16 du dispositif de sortie de gaz d'échappement 10 respectivement dans une région A et dans une région B de l'écran thermique 14. Figures 2 and 3 show a section of the attachment zone 16 of the exhaust gas outlet device 10 respectively in a region A and in a region B of the heat shield 14.
Tel que représenté aux figures 2 et 3, le fond de la rainure 17 présente une partie centrale 18 délimitée par des bords longitudinaux 20 et présentant un profil en arc de cercle de rayon R. As shown in FIGS. 2 and 3, the bottom of the groove 17 has a central portion 18 delimited by longitudinal edges 20 and having an arcuate profile of radius R.
La longueur de la partie centrale 18 en arc de cercle est de l'ordre de 29 millimètres. The length of the central portion 18 in an arc is of the order of 29 millimeters.
La partie en arc de cercle se prolonge ensuite de part et d'autre depuis les bords 20 par deux ailes latérales 19. The arcuate part then extends on either side from the edges 20 by two lateral wings 19.
Les zones de section réduite 16 forment des zones de fixation de l'écran 14 sur dispositif de sortie de gaz d'échappement 10. The areas of reduced section 16 form zones for fixing the screen 14 to an exhaust gas outlet device 10.
L'écran 14 peut comporter plusieurs zones de fixation, selon l'architecture du dispositif 10. The screen 14 may comprise several attachment zones, depending on the architecture of the device 10.
Tel que représenté à la figure 2, la zone de fixation 16 coopère avec le conduit 12 de rayon R égal au rayon de la partie en arc de cercle 18 du fond de la rainure 17. La totalité de la surface de la partie en arc de cercle 18 de la zone de fixation est alors en contact avec la paroi du conduit 12. As shown in FIG. 2, the attachment zone 16 cooperates with the duct 12 of radius R equal to the radius of the arcuate portion 18 of the bottom of the groove 17. The entire surface of the arcuate portion of the groove circle 18 of the fixing zone is then in contact with the wall of the duct 12.
Les ailes 19 s'étendent à distance de la paroi du conduit 12. Tel que représenté à la figure 3, la zone de fixation 16 de l'écran 14 coopère avec le conduit 12' de rayon R'. La partie en arc de cercle 18 de la zone de fixation 16 n'est alors pas totalement en contact avec la paroi du conduit 12'. Seuls les bords longitudinaux 20 de la partie centrale 18 sont en contact avec la paroi du conduit 12'. Ainsi le contact entre l'écran 14 et le conduit 12' est linéaire, l'écran 14 étant distant d'environ 1 millimètre du conduit 12' entre les bords longitudinaux 20. The wings 19 extend at a distance from the wall of the duct 12. As shown in FIG. 3, the attachment zone 16 of the screen 14 cooperates with the duct 12 'of radius R'. The arcuate portion 18 of the attachment zone 16 is then not fully in contact with the wall of the duct 12 '. Only the longitudinal edges 20 of the central portion 18 are in contact with the wall of the duct 12 '. Thus the contact between the screen 14 and the duct 12 'is linear, the screen 14 being about 1 mm apart from the duct 12' between the longitudinal edges 20.
Les ailes 19 s'étendent à distance de la paroi du conduit 12'. The wings 19 extend away from the wall of the duct 12 '.
Ainsi, les zones de fixation 16, bien qu'identiques, peuvent cependant coopérer avec les deux conduits 12 et 12'de diamètres différents Thus, the attachment zones 16, although identical, can however cooperate with the two ducts 12 and 12 'of different diameters
Une fois l'écran 14 disposé sur les conduits 12 et 12' sa fixation peut ensuite s'effectuer de deux façons différentes. Once the screen 14 disposed on the conduits 12 and 12 'its attachment can then be carried out in two different ways.
Tel que représenté à la figure 4, dans la région A du dispositif 10, l'écran 14 est fixé au moyen d'un collier de serrage 22 apte à être passé dans des orifices 24 ménagés au niveau des bords longitudinaux 20 de la partie centrale 18 des zones de fixation 16. Les dimensions des orifices sont de l'ordre de 12 millimètres par 8 millimètres. As represented in FIG. 4, in the region A of the device 10, the screen 14 is fixed by means of a clamping collar 22 adapted to be passed through orifices 24 formed at the longitudinal edges 20 of the central portion. The dimensions of the orifices are of the order of 12 millimeters by 8 millimeters.
Le collier 22 est ainsi disposé par-dessus la partie en arc-de-cercle 18 et ses extrémités sont insérées à l'intérieur des orifices 24 de façon qu'elles passent sous les bords 20. Les extrémités sont ensuite attachées ensemble sous le conduit 12 (non représentées). The collar 22 is thus disposed over the arcuate portion 18 and its ends are inserted inside the orifices 24 so that they pass under the edges 20. The ends are then attached together under the conduit 12 (not shown).
Tel que représenté à la figure 5 l'écran 14 est fixé au moyen de cordons de soudure 26 déposés entre l'écran et la paroi du conduit, au niveau d'un bord longitudinal 240 des orifices 24. Les cordons de soudure sont disposés de la même façon quel que soit le diamètre du conduit. As shown in FIG. 5, the screen 14 is fixed by means of welding beads 26 deposited between the screen and the wall of the duct, at a longitudinal edge 240 of the orifices 24. The welding beads are arranged the same way regardless of the diameter of the duct.
Bien évidemment, selon les besoins et les contraintes, il est également possible, dans la région A de fixer l'écran 14 au moyen de cordons de soudure et dans la région B au moyen d'un collier de serrage. Of course, according to the needs and constraints, it is also possible in the region A to fix the screen 14 by means of welding beads and in the region B by means of a clamping collar.
Ainsi, l'écran thermique 14 selon l'invention peut être fixé sur deux conduits de diamètres différents et de deux manières différentes de façon à pouvoir s'adapter aux contraintes d'architecture de la ligne d'échappement sans pour autant générer de diversités dans les écrans thermiques. L'écran thermique selon l'invention peut aussi être fixé sur un conduit dont le diamètre ne varie pas. Thus, the heat shield 14 according to the invention can be fixed on two ducts of different diameters and in two different ways so as to adapt to the architectural constraints of the exhaust line without generating differences in thermal screens. The heat shield according to the invention can also be fixed on a duct whose diameter does not vary.
L'écran thermique selon l'invention peut être fixé selon un moyen de fixation unique (collier ou points de soudure) dans toutes ses zones de fixation. The heat shield according to the invention can be fixed according to a single fastening means (collar or weld points) in all its attachment zones.

Claims

REVENDICATIONS
1 ) Ecran de protection thermique (14) destiné à entourer partiellement un conduit (12,12') de dispositif de sortie de gaz d'échappement de véhicule automobile et présentant une forme de coque apte à être disposée à distance du conduit (12,12'), caractérisé en ce que l'écran de protection thermique (14) comporte au moins une zone (16) pour sa fixation au conduit (12, 12') selon plusieurs modes, la zone de fixation (16) étant formée par un resserrement de la paroi de la coque formant une rainure transversale (17), le fond de la rainure (17) présentant une partie centrale (18) délimitée par des bords longitudinaux (20) et présentant un profil semi-circulaire de rayon (R), la zone de fixation (16) étant apte à coopérer indifféremment avec deux conduits de rayons différents (R , R'), le rayon (R') étant supérieur au rayon (R). 1) thermal protection screen (14) for partially surrounding a duct (12, 12 ') of a motor vehicle exhaust gas outlet device and having a shell shape capable of being disposed at a distance from the duct (12, 12 '), characterized in that the thermal protection screen (14) has at least one zone (16) for fixing it to the duct (12, 12') in a plurality of modes, the fixing zone (16) being formed by a tightening of the wall of the shell forming a transverse groove (17), the bottom of the groove (17) having a central portion (18) delimited by longitudinal edges (20) and having a semi-circular profile radius (R ), the fixing zone (16) being able to cooperate indifferently with two different ray ducts (R, R '), the radius (R') being greater than the radius (R).
2) Ecran de protection thermique (14) selon la revendication 1 , caractérisé en ce que la partie semi circulaire (18) de la zone de fixation (16) est apte à entrer en contact dans sa totalité avec la paroi d'un conduit (12) de rayon (R). 2) thermal protection screen (14) according to claim 1, characterized in that the semicircular portion (18) of the attachment zone (16) is able to come into contact in its entirety with the wall of a duct ( 12) of radius (R).
3) Ecran de protection thermique (14) selon la revendication 1 , caractérisé en ce que les bords longitudinaux (20) de la partie semi-circulaire de la zone de fixation (16) sont aptes à venir en contact avec la paroi d'un conduit (12') de rayon (R'), la surface de la partie semi circulaire (18) située entre les bords longitudinaux (20) étant à distance de la paroi du conduit (12'). 3) thermal protection screen (14) according to claim 1, characterized in that the longitudinal edges (20) of the semicircular portion of the attachment zone (16) are adapted to come into contact with the wall of a conduit (12 ') of radius (R'), the surface of the semicircular portion (18) located between the longitudinal edges (20) being at a distance from the wall of the conduit (12 ').
4) Ecran de protection thermique (14) selon l'une des revendications 1 à 3, caractérisé en ce que l'écran de protection thermique est apte à être fixé au conduit (12,12') de rayon (R,R') par l'intermédiaire de cordons de soudure (26) aptes à être déposés entre la partie semi-circulaire (18) de la zone de fixation (16) et la paroi du conduit (12,12') de rayon (R,R').  4) Thermal protection screen (14) according to one of claims 1 to 3, characterized in that the thermal protection screen is adapted to be fixed to the conduit (12,12 ') radius (R, R') by means of welding beads (26) capable of being deposited between the semicircular portion (18) of the attachment zone (16) and the wall of the channel (12, 12 ') of radius (R, R' ).
5) Ecran de protection thermique (14) selon l'une des revendications 1 à 3, caractérisé en ce que l'écran thermique de protection (14) est apte à être fixé au conduit (12,12') de rayon (R,R') par l'intermédiaire d'un collier souple (22) apte à être reçu dans des ouvertures (24) ménagées dans les bords longitudinaux (20) de la partie centrale (18) de la zone de fixation (16).  5) thermal protection screen (14) according to one of claims 1 to 3, characterized in that the protective heat shield (14) is adapted to be fixed to the conduit (12, 12 ') radius (R, R ') via a flexible collar (22) adapted to be received in openings (24) formed in the longitudinal edges (20) of the central portion (18) of the attachment zone (16).
6) Ecran de protection thermique (14) selon l'une des revendications 1 à 5, caractérisé en ce que le rayon R est égal à 22,5 millimètres. 7) Ecran de protection thermique selon l'une des revendications 1 à 5, caractérisé en ce que le rayon R' est égal à 25 millimètres. 6) thermal protection screen (14) according to one of claims 1 to 5, characterized in that the radius R is equal to 22.5 millimeters. 7) thermal protection screen according to one of claims 1 to 5, characterized in that the radius R 'is equal to 25 millimeters.
PCT/FR2014/053205 2013-12-10 2014-12-08 Heat protection screen for an exhaust gas outlet device of a motor vehicle WO2015086971A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1362357A FR3014484B1 (en) 2013-12-10 2013-12-10 THERMAL PROTECTION SCREEN FOR EXHAUST GAS OUTPUT DEVICE OF MOTOR VEHICLE
FR1362357 2013-12-10

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WO2015086971A1 true WO2015086971A1 (en) 2015-06-18

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3237716A (en) * 1964-07-21 1966-03-01 Billie D Parsons Detachable heat shield for exhaust muffler
DE2614396A1 (en) * 1975-04-04 1976-10-14 Nissan Motor EXHAUST SYSTEM OF A VEHICLE, IN PARTICULAR WITH AN INTERNAL COMBUSTION ENGINE
US5474123A (en) * 1994-04-19 1995-12-12 Buckshaw; Dennis J. Tube shield
US6438949B1 (en) * 1999-10-25 2002-08-27 Honda Giken Kogyo Kabushiki Kaisha Cover member attachment structure
EP1630371A2 (en) * 2004-08-31 2006-03-01 HONDA MOTOR CO., Ltd. Exhaust device for vehicle engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3237716A (en) * 1964-07-21 1966-03-01 Billie D Parsons Detachable heat shield for exhaust muffler
DE2614396A1 (en) * 1975-04-04 1976-10-14 Nissan Motor EXHAUST SYSTEM OF A VEHICLE, IN PARTICULAR WITH AN INTERNAL COMBUSTION ENGINE
US5474123A (en) * 1994-04-19 1995-12-12 Buckshaw; Dennis J. Tube shield
US6438949B1 (en) * 1999-10-25 2002-08-27 Honda Giken Kogyo Kabushiki Kaisha Cover member attachment structure
EP1630371A2 (en) * 2004-08-31 2006-03-01 HONDA MOTOR CO., Ltd. Exhaust device for vehicle engine

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FR3014484B1 (en) 2019-06-07
FR3014484A1 (en) 2015-06-12

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