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EP3555436B1 - Motor vehicle exhaust line comprising noise limitation means - Google Patents

Motor vehicle exhaust line comprising noise limitation means Download PDF

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Publication number
EP3555436B1
EP3555436B1 EP17821868.1A EP17821868A EP3555436B1 EP 3555436 B1 EP3555436 B1 EP 3555436B1 EP 17821868 A EP17821868 A EP 17821868A EP 3555436 B1 EP3555436 B1 EP 3555436B1
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EP
European Patent Office
Prior art keywords
sleeve
pipe
cavities
wall
exhaust line
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
EP17821868.1A
Other languages
German (de)
French (fr)
Other versions
EP3555436A1 (en
Inventor
Jean-Luc Adam
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
Original Assignee
Renault SAS
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Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP3555436A1 publication Critical patent/EP3555436A1/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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/14—Wire mesh fabric, woven glass cloth or the like
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated

Definitions

  • the invention relates to a motor vehicle exhaust line comprising at least one perforated tube having a plurality of cavities and a sleeve made of a tubular metal mesh formed of meshes.
  • Such an exhaust line having a perforated tube can present when the vehicle is in operation, problems of whistling because the flow of gas passing over a cavity causes the generation of a significant acoustic emission when the length of the cavity allows synchronization between the moment of release of a vortex at the upstream edge of the cavity and the impact of another vortex at the downstream edge of the cavity.
  • the downstream acoustic emission then maintains and amplifies the generation of a new vortex at the upstream edge of the cavity.
  • the subject of the invention is an exhaust line comprising means for limiting noise which is inexpensive and light.
  • the subject of the invention is also an exhaust line comprising means for limiting the noise which has a slight influence on the pressure drops and the pressure balance.
  • the invention provides an exhaust line of the type cited above according to claims 1 and 2, characterized in that the length of a mesh of the mesh constituting the sleeve is less than or equal to half of the length of a tube cavity, so as to avoid the formation of vortices opposite the cavities.
  • an exhaust line 10 of a motor vehicle comprises a perforated pipe 12 traversed by an exhaust gas flow F.
  • the perforated pipe 12 has a plurality of cavities 14 piercing right through the wall 16 of the pipe 12.
  • a sleeve 18 formed by a metal mesh is arranged inside the pipe 12 so as to prevent the exhaust gases, flowing along the cavities 14, from producing annoying sound emissions.
  • the sleeve 18 is placed against an internal face 16int of the wall 16 of the pipe 12. It is fixed to the pipe 12, for example by welding.
  • the mesh size of the mesh is provided for the length of a mesh of the mesh is less than or equal to half the length of a cavity of the tube
  • the sleeve 18 formed of a mesh is arranged outside the pipe 12, along an outer face 16ext of the wall 16 of the pipe 12.
  • the size of the meshes of the mesh forming the sleeve 18 is provided so that the length of a mesh of the mesh is less than or equal to half the length of a cavity of the tube.
  • the mesh is then pushed into the cavities 14 so as to form hollows 20 on the surface of the sleeve 18.
  • the bottom 200 of the hollows 20 formed in the sleeve 18 is flush with the surface of the internal face 16int of the wall 16.
  • the sleeve 18 formed of a mesh is arranged outside the pipe 12, along the outer face 16ext of the pipe 16.
  • the size of the meshes of the mesh forming the sleeve 18 is provided so that the length of a mesh of the mesh is less than or equal to half the length of a cavity of the tube.
  • the mesh forming the sleeve 18 is perforated facing the cavities 14 of the pipe 16.
  • the perforations 22 thus formed in the sleeve 18 form a peripheral wall 220 extending through the cavities 14 towards the interior of the pipe 16, in a direction. substantially perpendicular to the wall of the pipe 16.
  • a free edge 222 of the wall 220 protrudes from the internal face 16int of the wall 16 of the pipe 12 so as to form a deflector preventing the formation of vortices opposite the cavities 14.

Landscapes

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

Description

L'invention concerne une ligne d'échappement de véhicule automobile comportant au moins un tube perforé présentant une pluralité de cavités et un manchon constitué d'un treillis tubulaire métallique formé de mailles.The invention relates to a motor vehicle exhaust line comprising at least one perforated tube having a plurality of cavities and a sleeve made of a tubular metal mesh formed of meshes.

Une telle ligne d'échappement présentant un tube perforé, peut présenter lorsque le véhicule est en fonctionnement, des problèmes de sifflements car l'écoulement du gaz passant au-dessus d'une cavité entraine la génération d'une émission acoustique importante lorsque la longueur de la cavité permet une synchronisation entre l'instant de lâcher d'un tourbillon au bord amont de la cavité et l'impact d'un autre tourbillon au bord aval de la cavité. L'émission acoustique en aval vient alors entretenir et amplifier la génération d'un nouveau tourbillon au bord amont de la cavité.Such an exhaust line having a perforated tube, can present when the vehicle is in operation, problems of whistling because the flow of gas passing over a cavity causes the generation of a significant acoustic emission when the length of the cavity allows synchronization between the moment of release of a vortex at the upstream edge of the cavity and the impact of another vortex at the downstream edge of the cavity. The downstream acoustic emission then maintains and amplifies the generation of a new vortex at the upstream edge of the cavity.

Pour pallier ce problème, il est connu d'utiliser des fibres de laine de verre, d'inox ou de roche qui viennent remplir l'espace qui entoure les cavités de façon à rendre impossible la résonance acoustique. Cependant, cette solution présente plusieurs inconvénients : elle augmente le coût et le poids de la pièce.To overcome this problem, it is known to use fibers of glass wool, stainless steel or rock which fill the space which surrounds the cavities so as to make acoustic resonance impossible. However, this solution has several drawbacks: it increases the cost and the weight of the part.

Il est connu également de modifier la forme ou le diamètre des cavités pour éviter la synchronisation entre la fréquence de lâcher de tourbillons et la résonance de cavité. Cependant la mise au point de de ce type de solution est difficile car la fréquence de lâcher varie en fonction du régime moteur et balaie donc une large plage de fréquences.It is also known to modify the shape or the diameter of the cavities to avoid synchronization between the frequency of the release of vortices and the resonance of the cavity. However, the development of this type of solution is difficult because the release frequency varies according to the engine speed and therefore sweeps a wide range of frequencies.

Les documents US2003 /118762 et US2010/263762 décrivent aussi des lignes d'échappement comportant des tubes perforés munis d'un treillis.The documents US2003 / 118762 and US2010 / 263762 also describe exhaust lines comprising perforated tubes provided with a lattice.

Afin de pallier ces inconvénients, l'invention a pour objet une ligne d'échappement comportant des moyens de limitation du bruit qui soit peu coûteuse, légère.In order to overcome these drawbacks, the subject of the invention is an exhaust line comprising means for limiting noise which is inexpensive and light.

L'invention a aussi pour objet une ligne d'échappement comportant des moyens de limitation du bruit qui ait une faible influence sur les pertes de charge et l'équilibre de pressions.The subject of the invention is also an exhaust line comprising means for limiting the noise which has a slight influence on the pressure drops and the pressure balance.

A cet effet, l'invention propose une ligne d'échappement du type cité ci-dessus selon les revendications 1 et 2, caractérisé en ce que la longueur d'une maille du treillis constituant le manchon est inférieure ou égale à la moitié de la longueur d'une cavité du tube, de façon à éviter la formation de tourbillons en regard des cavités.To this end, the invention provides an exhaust line of the type cited above according to claims 1 and 2, characterized in that the length of a mesh of the mesh constituting the sleeve is less than or equal to half of the length of a tube cavity, so as to avoid the formation of vortices opposite the cavities.

Selon d'autres caractéristiques de l'invention:

  • Le manchon est disposé contre une face externe de la paroi du tube perforé, le treillis formant le manchon étant enfoncé dans les cavités du tube perforé de façon à former des creux en regard des cavités.
  • Les creux formés dans le treillis du manchon comportent un fond qui affleure la face interne de la paroi du tube.
  • Le manchon est disposé contre une face externe du tube perforé, le manchon comportant des perforations situées en regard des cavités du tube perforé.
  • Les perforations comportent une paroi périphérique sensiblement perpendiculaire à la paroi du tube et s'étendant à travers les cavités du tube.
  • Un bord libre de la paroi périphérique déborde de la face interne de la paroi du tube.
According to other characteristics of the invention:
  • The sleeve is placed against an external face of the wall of the perforated tube, the mesh forming the sleeve being pushed into the cavities of the perforated tube so as to form hollows facing the cavities.
  • The hollows formed in the mesh of the sleeve have a bottom which is flush with the internal face of the wall of the tube.
  • The sleeve is placed against an external face of the perforated tube, the sleeve comprising perforations located opposite the cavities of the perforated tube.
  • The perforations have a peripheral wall substantially perpendicular to the wall of the tube and extending through the cavities of the tube.
  • A free edge of the peripheral wall protrudes from the internal face of the wall of the tube.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description d'exemples de réalisation d'une ligne d'échappement selon l'invention en référence aux dessins annexés dans lesquels :

  • La figure 1 est une vue schématique latérale en coupe d'une ligne d'échappement non selon la présente invention.
  • La figure 2 est vue schématique latérale en coupe d'un premier mode de réalisation d'une ligne d'échappement selon l'invention.
  • La figure 3 est une vue schématique latérale en coupe d'un deuxième mode de réalisation d'une ligne d'échappement selon l'invention.
Other characteristics and advantages of the invention will become apparent on reading the description of exemplary embodiments of an exhaust line according to the invention with reference to the appended drawings in which:
  • The figure 1 is a schematic side sectional view of an exhaust line not according to the present invention.
  • The figure 2 is a schematic side sectional view of a first embodiment of an exhaust line according to the invention.
  • The figure 3 is a schematic side sectional view of a second embodiment of an exhaust line according to the invention.

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 3. Des éléments identiques ou analogues sont désignés par les mêmes chiffres de référence.In the following description, we will take, without limitation, a longitudinal, vertical and transverse orientation indicated by the trihedron L, V, T of figures 1 to 3 . Identical or analogous elements are designated by the same reference numerals.

Tel que représenté à la figure 1, une ligne d'échappement 10 de véhicule automobile comprend un tuyau 12 perforé traversé par un flux de gaz d'échappement F.As depicted in the figure 1 , an exhaust line 10 of a motor vehicle comprises a perforated pipe 12 traversed by an exhaust gas flow F.

Le tuyau 12 perforé comporte une pluralité de cavités 14 perçant de part en part la paroi 16 du tuyau 12.The perforated pipe 12 has a plurality of cavities 14 piercing right through the wall 16 of the pipe 12.

Un manchon 18 formé par un treillis métallique est disposé à l'intérieur du tuyau 12 de façon à éviter que les gaz d'échappement, en s'écoulant le long des cavités 14 ne produisent des émissions sonores gênantes.A sleeve 18 formed by a metal mesh is arranged inside the pipe 12 so as to prevent the exhaust gases, flowing along the cavities 14, from producing annoying sound emissions.

Le manchon 18 est disposé contre une face interne 16int de la paroi 16 du tuyau 12. Il est fixé au tuyau 12 par exemple par soudage.The sleeve 18 is placed against an internal face 16int of the wall 16 of the pipe 12. It is fixed to the pipe 12, for example by welding.

La taille des mailles du treillis est prévue pour la longueur d'une maille du treillis soit inférieure ou égale à la moitié de la longueur d'une cavité du tube Tel que représenté à la figure 2, dans un premier mode de réalisation de la ligne d'échappement 10, le manchon 18 formé d'un treillis est disposé à l'extérieur du tuyau 12, le long d'une face externe 16ext de la paroi 16 du tuyau 12.The mesh size of the mesh is provided for the length of a mesh of the mesh is less than or equal to half the length of a cavity of the tube As shown in figure 2 , in a first embodiment of the exhaust line 10, the sleeve 18 formed of a mesh is arranged outside the pipe 12, along an outer face 16ext of the wall 16 of the pipe 12.

La taille des mailles du treillis formant le manchon 18 est prévue pour que la longueur d'une maille du treillis soit inférieure ou égale à la moitié de la longueur d'une cavité du tube.The size of the meshes of the mesh forming the sleeve 18 is provided so that the length of a mesh of the mesh is less than or equal to half the length of a cavity of the tube.

Le treillis est alors enfoncé dans les cavités 14 de façon à former des creux 20 à la surface du manchon 18. Le fond 200 des creux 20 formés dans le manchon 18 affleure à la surface de la face interne 16int de la paroi 16. Ainsi, les risques de formation de tourbillons sont limités.The mesh is then pushed into the cavities 14 so as to form hollows 20 on the surface of the sleeve 18. The bottom 200 of the hollows 20 formed in the sleeve 18 is flush with the surface of the internal face 16int of the wall 16. Thus, the risks of vortex formation are limited.

Tel que représenté à la figure 3, dans un deuxième mode de réalisation de l'invention, le manchon 18 formé d'un treillis est disposé à l'extérieur du tuyau 12, le long de la face externe 16ext du tuyau 16.As depicted in the figure 3 , in a second embodiment of the invention, the sleeve 18 formed of a mesh is arranged outside the pipe 12, along the outer face 16ext of the pipe 16.

Comme dans le premier mode de réalisation, la taille des mailles du treillis formant le manchon 18 est prévue pour que la longueur d'une maille du treillis soit inférieure ou égale à la moitié de la longueur d'une cavité du tube.As in the first embodiment, the size of the meshes of the mesh forming the sleeve 18 is provided so that the length of a mesh of the mesh is less than or equal to half the length of a cavity of the tube.

Le treillis formant le manchon 18 est perforé en regard des cavités 14 du tuyau 16. Les perforations 22 ainsi ménagées dans le manchon 18 forment une paroi périphérique 220 s'étendant à travers les cavités 14 vers l'intérieur du tuyau 16, selon une direction sensiblement perpendiculaire à la paroi du tuyau 16. Un bord libre 222 de la paroi 220 déborde par rapport à la face interne 16int de la paroi 16 du tuyau 12 de façon à former un déflecteur évitant la formation de tourbillons en regard des cavités 14.The mesh forming the sleeve 18 is perforated facing the cavities 14 of the pipe 16. The perforations 22 thus formed in the sleeve 18 form a peripheral wall 220 extending through the cavities 14 towards the interior of the pipe 16, in a direction. substantially perpendicular to the wall of the pipe 16. A free edge 222 of the wall 220 protrudes from the internal face 16int of the wall 16 of the pipe 12 so as to form a deflector preventing the formation of vortices opposite the cavities 14.

Claims (3)

  1. Motor vehicle exhaust line (10) comprising at least one perforated pipe (12) having a plurality of cavities (14) and a sleeve (18) composed of a metallic tubular lattice formed by meshes, the length of a mesh of the lattice forming the sleeve (18) being less than or equal to half the length of a cavity (14) of the pipe (12), so as to avoid the formation of vortices opposite the cavities (14), the sleeve (18) being positioned against an outer wall (16ext) of the wall (16) of the perforated pipe (12), characterized in that the lattice forming the sleeve (18) is driven into the cavities (14) of the perforated pipe (12) and forms indentations (20) opposite the cavities (14) comprising a bottom (200) which is flush with the inner face (16int) of the wall (16) of the pipe (12).
  2. Motor vehicle exhaust line (10) comprising at least one perforated pipe (12) having a plurality of cavities (14) and a sleeve (18) composed of a metallic tubular lattice formed by meshes, the length of a mesh of the lattice forming a sleeve (18) being less than or equal to half the length of a cavity (14) of the pipe (12), so as to avoid the formation of vortices opposite the cavities (14), the sleeve (18) being positioned against an outer wall (16ext) of the wall (16) of the perforated pipe (12), the sleeve (18) comprising perforations (22) situated opposite the cavities (14) of the perforated pipe (12), characterized in that the perforations (12) comprise a peripheral wall (220) substantially at right angles to the wall (16) of the pipe (12) and extending through the cavities (14) of the pipe (12).
  3. Motor vehicle exhaust line (10) according to Claim 2, characterized in that a free edge (222) of the peripheral wall (220) overlaps the inner face (16int) of the wall (16) of the pipe (12).
EP17821868.1A 2016-12-19 2017-12-14 Motor vehicle exhaust line comprising noise limitation means Active EP3555436B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1662712A FR3060649B1 (en) 2016-12-19 2016-12-19 MOTOR VEHICLE EXHAUST LINE HAVING NOISE LIMITATION MEANS
PCT/EP2017/082878 WO2018114615A1 (en) 2016-12-19 2017-12-14 Motor vehicle exhaust line comprising noise limitation means

Publications (2)

Publication Number Publication Date
EP3555436A1 EP3555436A1 (en) 2019-10-23
EP3555436B1 true EP3555436B1 (en) 2021-10-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17821868.1A Active EP3555436B1 (en) 2016-12-19 2017-12-14 Motor vehicle exhaust line comprising noise limitation means

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EP (1) EP3555436B1 (en)
FR (1) FR3060649B1 (en)
WO (1) WO2018114615A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR66177E (en) * 1954-02-15 1956-05-17 Silent free exhaust for internal combustion and combustion engines
DE1031055B (en) * 1955-09-06 1958-05-29 Eberspaecher J Container with sound absorption filling and guide channel for pulsating gas flow, in particular sound absorbers for internal combustion engines
US3147097A (en) * 1962-04-09 1964-09-01 Aguas Cayetano Engine exhaust cleaner and muffler
US3339347A (en) * 1965-10-05 1967-09-05 Jr Herbert R Otto Filter
US5962821A (en) * 1995-01-27 1999-10-05 Iannetti; Francesco E. Internal combustion engine noise reduction apparatus
US7017706B2 (en) * 2001-12-21 2006-03-28 Honeywell International, Inc. Turbine noise absorber
KR200340730Y1 (en) * 2003-09-19 2004-02-11 유영배 Car muffler
US8191581B2 (en) * 2009-04-16 2012-06-05 Emcon Technologies, Llc Wire tube structure for exhaust component
WO2013069851A1 (en) * 2011-11-09 2013-05-16 주식회사 준비엘 Muffler for automobile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR3060649B1 (en) 2019-08-02
EP3555436A1 (en) 2019-10-23
WO2018114615A1 (en) 2018-06-28
FR3060649A1 (en) 2018-06-22

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