US20090139219A1 - Exhaust conduit - Google Patents
Exhaust conduit Download PDFInfo
- Publication number
- US20090139219A1 US20090139219A1 US11/576,492 US57649205A US2009139219A1 US 20090139219 A1 US20090139219 A1 US 20090139219A1 US 57649205 A US57649205 A US 57649205A US 2009139219 A1 US2009139219 A1 US 2009139219A1
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- US
- United States
- Prior art keywords
- exhaust
- exhaust conduit
- tube
- ring
- internal
- 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.)
- Abandoned
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Classifications
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- 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
- F01N13/06—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 specially adapted for star-arrangement of cylinders, e.g. exhaust manifolds
-
- 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
-
- 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
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- 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
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/085—Other arrangements or adaptations of exhaust conduits having means preventing foreign matter from entering exhaust conduit
-
- 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
-
- 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
- F01N2310/04—Metallic wool, e.g. steel wool, copper wool 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
- F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
Definitions
- the present invention relates to an exhaust conduit, which an exhaust line of an internal combustion engine includes.
- This invention relates to the field of the car industry, and more particularly to that of the manufacture of the equipment ensuring the exhaust of gases resulting from the combustion of a fuel by a thermal internal combustion engine.
- an engine is supplemented with an exhaust line comprising at least one exhaust conduit, for example consisting of an exhaust downtake connected, on the one hand, to the engine through a collector and, on the other hand, to a silencer and/or a gas-decontaminating element, such as a particle filter.
- an exhaust line comprising at least one exhaust conduit, for example consisting of an exhaust downtake connected, on the one hand, to the engine through a collector and, on the other hand, to a silencer and/or a gas-decontaminating element, such as a particle filter.
- Such an exhaust downtake can also be connected to a decontaminating element (catalyst, particle filter, . . . ), located downstream of this exhaust downtake, and the operation of which is optimal for exhaust gases at high temperature, so that these gases should be maintained at high temperature until their arrival in the said decontaminating element.
- a decontaminating element catalyst, particle filter, . . .
- an exhaust downtake comprising two tubes, an external tube and an internal tube.
- This internal tube is positioned inside the external tube, so as to delimit between these two tubes a peripheral volume inside which is implanted a material for the heat insulation of the exhaust downtake.
- the peripheral volume receiving the insulating material communicates, at the level of its one end, with the internal volume of the internal tube inside which the exhaust gases circulate. These gases are then likely to penetrate into the peripheral volume and to be in contact with the insulating material, which must then being chosen so as to have a good resistance to these gases and high temperatures, in order to avoid any degradation.
- an insulating material having such performances is particularly expensive, which considerably increases the cost of such an exhaust downtake.
- the external tube In addition and in order to define a peripheral volume likely to accommodate an insulating material, the external tube must be positioned adequately with respect to the internal tube, which is ensured through indentations provided for at the level of this internal tube or (and preferably) of this external tube and which rest on this external tube or this internal tube, respectively.
- Such indentations adopt, for example, the shape of punches and have drawbacks consisting, on the one hand, in causing an embrittlement of the exhaust downtake and, on the other hand, in creating a thermal bridge between the internal and external tubes resulting into bad performances in term of insulation, even a total absence of insulation, of the exhaust downtake.
- the present invention pretends to be capable of coping with the drawbacks of the exhaust conduits of the state of the art.
- an exhaust conduit which an exhaust line of an internal combustion engine comprises, and which includes, on the one hand, an external tube and an internal tube positioned inside the external tube so as to delimit, between these two tubes, a peripheral volume inside which is implanted a material for heat insulation of this conduit, on the other hand and at the level of a first end of this exhaust conduit, first means for connecting this exhaust conduit to a first exhaust element, in particular an exhaust-gas collector and, in addition and at the level of a second end of this exhaust conduit, second means for connecting this conduit to a second exhaust element, which said exhaust line comprises.
- This exhaust conduit is characterized in that it includes, proximate its second end, means for preventing a penetration of the exhaust gases, circulating inside the internal tube, into the peripheral volume delimited by this internal tube and the external tube.
- Another feature consists in that the means for preventing a penetration of gases into the peripheral volume consist of a ring inserted over the internal tube and over which is positioned the external tube and/or the second connecting means.
- the second connecting means is, on the one hand, positioned over said ring and, on the other hand, slid inside or over the external tube, which this second connecting means is made integral with, namely through welding.
- Still another feature relates to the fact that the ring is inserted over the internal tube with the possibility of displacement with respect to this internal tube and/or to the external tube and/or to the second connecting means, while the conduit includes means for maintaining the ring inserted onto this internal tube.
- the means for maintaining the ring on the internal tube are formed of a shoulder which includes, internally, the second connecting means and which cooperates with this ring.
- the ring is made out of a metallic material and, in particular, consists of a mesh wire.
- this ring can also be made out of a heat-insulating material, in particular a fiber-based material having a high thermal resistance.
- Another feature consists in that the internal and external tubes are made integral at the level of the first connecting means, namely through welding.
- the invention also relates to an exhaust downtake, which includes an exhaust line of an internal combustion engine and which includes or consists of an exhaust conduit as described above.
- the invention relates to an exhaust line of an internal combustion engine including an exhaust conduit as described above.
- the conduit includes means for preventing a penetration of the gases into the peripheral volume, which impedes these gases from entering into contact with the insulating material, which then does not suffer any degradation.
- Another advantage consists in that, on the one hand, the internal and external tubes are made integral at the level of the first connecting means and, on the other hand, the means for preventing a penetration of the gases into the peripheral volume consist of a ring, implanted at the level of the second end of the conduit, inserted over the internal tube and over which is positioned the external tube and/or the second connecting means, this with the possibility of displacement of this ring.
- Such an embodiment authorizes, on the one hand, a relative movement of the internal tube with respect to the external tube, due to phenomena of differential thermal dilation and, on the other hand, an adequate positioning of this internal tube with respect to the external tube and the second connecting means, this by avoiding the above-mentioned drawbacks related to the indentations and by adequately delimiting the peripheral volume.
- FIG. 1 is a cross-sectional view of an exhaust conduit according to the present invention
- FIG. 2 is a schematic detail view of the second end of the exhaust conduit shown in FIG. 1 .
- the present invention relates to the field of the car industry, and more particularly to that of the manufacture of the equipment ensuring the exhaust of gases resulting from the combustion of a fuel by a thermal internal combustion engine.
- the invention relates to an exhaust conduit 1 , which an exhaust line of an internal combustion engine includes.
- an exhaust conduit 1 is, preferably, comprised of an exhaust downtake, knowing that the present invention is however in no way limited to it.
- Such an exhaust conduit 1 includes an internal tube 2 inside which the exhaust gases circulate.
- This internal tube 2 can be made of one single part, but is preferably made from two half shells that are united, in particular through welding, which advantageously allows providing such a tube 2 with a complex shape, adapted to its environment, namely inside a motor compartment.
- This exhaust conduit 1 also includes an external tube 3 inside which said internal tube is implanted 2 , this external tube 3 being made, preferably, from two half shells united to each other, in particular through welding, this over said internal tube 2 .
- This external tube 3 is made, preferably, from two half shells united to each other, in particular through welding, this over said internal tube 2 .
- Such an assembly of half shells allows, here too, providing this external tube 3 with a complex shape and easily and suitably positioning the internal tube 2 inside this external tube 3 .
- the positioning of the internal tube 2 inside the external tube 3 is carried out so as to delimit, between these two tubes 2 , 3 , a peripheral volume 4 inside which is implanted a material 5 designed capable of ensuring a heat insulation of the exhaust conduit 1 .
- Such an insulation allows, on the one hand, protecting the surroundings of the exhaust conduit 1 from the high exhaust-gas temperature and, on the other hand, maintaining the gases at high temperature at the exit of the conduit 1 , so as to allow the optimal operation of the decontaminating means located downstream of this conduit 1 .
- this exhaust conduit 1 has two ends 6 , 7 , a first end 6 of which located upstream of the conduit 1 as well as a second end 7 located downstream of this conduit 1 , this according to the direction of circulation of the gases in this conduit 1 .
- This conduit 1 then includes, at the level of this first end 6 , first means 8 for connecting this exhaust conduit 1 to a first exhaust element (not shown) and which, in the case of an exhaust conduit 1 defined by an exhaust downtake, consists of an exhaust-gas collector.
- such a first connecting means 8 preferably consists of a flange or the like.
- This conduit 1 also includes, and at the level of said second end 7 , second means 9 for connecting this exhaust conduit 1 to a second exhaust element (not shown), which, in the case of an exhaust conduit 1 defined by an exhaust downtake, consists of a silencer or a decontaminating element, in particular a particle filter.
- this second connecting means 9 can consist of a part allowing ensuring the connection between a second exhaust element and either the internal tube 2 or the external tube 3 , even these two tubes 2 , 3 .
- this second connecting means 9 allows ensuring the connection between the second exhaust element and the external tube 3 and, on the other hand, preferably consists of a binding band or the like.
- this exhaust conduit 1 includes, proximate its second end 7 , means 10 for preventing a penetration of exhaust gases, circulating inside the internal tube 2 , into the peripheral volume 4 delimited by this internal tube 2 and the external tube 3 .
- the means 10 for preventing a penetration of gases into the peripheral volume 4 consist of a ring 11 , on the one hand, inserted over the internal tube 2 and, on the other hand, over which 11 is positioned the external tube 2 and/or the second connecting means 9 .
- the external tube 2 is inserted over this ring 11 .
- the second connecting means 9 is inserted over said ring 11 .
- this second connecting means 9 on the one hand, is positioned over said ring 11 and, on the other hand, slid over or, and preferably ( FIG. 2 ), inside the external tube 3 , which this second connecting means 9 is made integral with, namely through welding.
- said ring 11 is inserted over the internal tube 2 , this with a possibility of displacement with respect to the internal tube 2 and/or the external tube 3 and/or the second connecting means 9 .
- the internal tube 2 is likely to adopt a relative displacement with respect to the external tube 3 , due to phenomena of thermal differential expansion. Such a relative displacement is, in particular, noticeable at the level of the second end 7 of the conduit 1 , since this internal tube 2 is only made integral with the external tube 3 at the level of the first end 6 of this conduit 1 .
- this ring 11 is made integral with the internal tube 2 and is then likely to move with respect to the external tube 3 and/or the second connecting means 9 .
- this ring 11 can be made integral with the external tube 3 and/or the second connecting means 9 , so that the internal tube 2 is likely to move with respect to this ring 11 .
- the ring 11 is inserted over the internal tube 2 with a possibility of displacement with respect to this internal tube 2 , with respect to the external tube 3 and with respect to the second connecting means 9 .
- the exhaust conduit 1 also includes means 12 for maintaining the ring 11 inserted on the internal tube 2 .
- Such means 12 advantageously allow maintaining the ring 11 on the internal tube 2 , even during the relative displacements of this internal tube 2 with respect to the external tube 3 and the second connecting means 9 .
- such means 12 for maintaining the ring 11 on the internal tube 2 consist of a shoulder 13 the second connecting means 9 includes internally, and which cooperates with this ring 11 .
- the ring 11 is made out of a metallic material and consists, in particular, of a mesh wire.
- this ring 11 can be made out of a heat-insulating material, in particular a fiber-based material having a high thermal strength, for example non-intumescent fibers of the type of those described in patent application EP 906495.
- the use of means 10 for impeding a penetration of the exhaust gases into the peripheral volume 4 advantageously allows avoids arranging, inside this peripheral volume 4 and along the whole exhaust conduit 1 , an insulating material 5 particularly resistant to the hot exhaust gases and, hence, particularly expensive.
- an insulating material can, for example, be reserved only for the manufacture of a ring 11 , whereas the insulating material arranged in the peripheral volume 4 , this along the whole exhaust conduit 1 , except at the level of its second end 7 , can consist of fibers having a lower mechanical strength and considerably cheaper.
- the invention also relates to an exhaust downtake, which an exhaust line of an internal combustion engine includes and which includes or consists of an exhaust conduit 1 as described above.
- the invention relates to an exhaust line of an internal combustion engine including an exhaust conduit 1 as described above.
Abstract
The invention concerns an exhaust conduit (1) comprising an outer tube (3) and an inner tube (2) positioned inside the outer tube (3) so as to delimit, between those two tubes (2, 3), a peripheral volume (4) inside which is implanted a material (5) for thermal insulation of said conduit (1) and at one first end (6) of said conduit (1), first means (8) for connection to a first exhaust element and at a second end (7) of said conduit (1), second means (9) for connecting said pipe (1) to a second exhaust element comprised in said exhaust line. Said conduit (1) is characterized in that it comprises, proximate its second end (7), means (10) for preventing exhaust gases circulating inside the inner tube (2) from penetrating into the peripheral volume (4) delimited by said inner tube (2) and the outer tube (3).
Description
- (1) Field of the Invention
- The present invention relates to an exhaust conduit, which an exhaust line of an internal combustion engine includes.
- This invention relates to the field of the car industry, and more particularly to that of the manufacture of the equipment ensuring the exhaust of gases resulting from the combustion of a fuel by a thermal internal combustion engine.
- In this respect, it should be noted that such an engine is supplemented with an exhaust line comprising at least one exhaust conduit, for example consisting of an exhaust downtake connected, on the one hand, to the engine through a collector and, on the other hand, to a silencer and/or a gas-decontaminating element, such as a particle filter.
- It is in particular inside such an exhaust downtake that circulate the exhaust gases, which, because of the proximity of the engine, have a particularly high temperature.
- Now, such an exhaust downtake passes proximate elements and organs (filters, hose connections, . . . ), namely located in the motor compartment, likely to undergo degradations under the action of high temperature and the protection of which should be ensured.
- Such an exhaust downtake can also be connected to a decontaminating element (catalyst, particle filter, . . . ), located downstream of this exhaust downtake, and the operation of which is optimal for exhaust gases at high temperature, so that these gases should be maintained at high temperature until their arrival in the said decontaminating element.
- (2) Description of the Prior Art
- To this end, there has been devised an exhaust downtake comprising two tubes, an external tube and an internal tube. This internal tube is positioned inside the external tube, so as to delimit between these two tubes a peripheral volume inside which is implanted a material for the heat insulation of the exhaust downtake.
- In such an embodiment, the peripheral volume receiving the insulating material communicates, at the level of its one end, with the internal volume of the internal tube inside which the exhaust gases circulate. These gases are then likely to penetrate into the peripheral volume and to be in contact with the insulating material, which must then being chosen so as to have a good resistance to these gases and high temperatures, in order to avoid any degradation. In this respect, it should be noted that an insulating material having such performances is particularly expensive, which considerably increases the cost of such an exhaust downtake.
- In addition and in order to define a peripheral volume likely to accommodate an insulating material, the external tube must be positioned adequately with respect to the internal tube, which is ensured through indentations provided for at the level of this internal tube or (and preferably) of this external tube and which rest on this external tube or this internal tube, respectively.
- Such indentations adopt, for example, the shape of punches and have drawbacks consisting, on the one hand, in causing an embrittlement of the exhaust downtake and, on the other hand, in creating a thermal bridge between the internal and external tubes resulting into bad performances in term of insulation, even a total absence of insulation, of the exhaust downtake.
- The present invention pretends to be capable of coping with the drawbacks of the exhaust conduits of the state of the art.
- To this end, the invention relates to an exhaust conduit, which an exhaust line of an internal combustion engine comprises, and which includes, on the one hand, an external tube and an internal tube positioned inside the external tube so as to delimit, between these two tubes, a peripheral volume inside which is implanted a material for heat insulation of this conduit, on the other hand and at the level of a first end of this exhaust conduit, first means for connecting this exhaust conduit to a first exhaust element, in particular an exhaust-gas collector and, in addition and at the level of a second end of this exhaust conduit, second means for connecting this conduit to a second exhaust element, which said exhaust line comprises. This exhaust conduit is characterized in that it includes, proximate its second end, means for preventing a penetration of the exhaust gases, circulating inside the internal tube, into the peripheral volume delimited by this internal tube and the external tube.
- Another feature consists in that the means for preventing a penetration of gases into the peripheral volume consist of a ring inserted over the internal tube and over which is positioned the external tube and/or the second connecting means.
- According to an additional feature, the second connecting means is, on the one hand, positioned over said ring and, on the other hand, slid inside or over the external tube, which this second connecting means is made integral with, namely through welding.
- Still another feature relates to the fact that the ring is inserted over the internal tube with the possibility of displacement with respect to this internal tube and/or to the external tube and/or to the second connecting means, while the conduit includes means for maintaining the ring inserted onto this internal tube.
- In fact, the means for maintaining the ring on the internal tube are formed of a shoulder which includes, internally, the second connecting means and which cooperates with this ring.
- According to an additional feature, the ring is made out of a metallic material and, in particular, consists of a mesh wire. However, this ring can also be made out of a heat-insulating material, in particular a fiber-based material having a high thermal resistance.
- Another feature consists in that the internal and external tubes are made integral at the level of the first connecting means, namely through welding.
- The invention also relates to an exhaust downtake, which includes an exhaust line of an internal combustion engine and which includes or consists of an exhaust conduit as described above.
- Finally, the invention relates to an exhaust line of an internal combustion engine including an exhaust conduit as described above.
- The advantages of this invention consist in that the conduit includes means for preventing a penetration of the gases into the peripheral volume, which impedes these gases from entering into contact with the insulating material, which then does not suffer any degradation.
- This authorizes the use of an insulating material, which, since it is protected from the exhaust gases, can have a substantially lower mechanical strength than the insulating material used in the state of the art and, therefore, has a substantially lower cost than the insulating material of the state of the art.
- Another advantage consists in that, on the one hand, the internal and external tubes are made integral at the level of the first connecting means and, on the other hand, the means for preventing a penetration of the gases into the peripheral volume consist of a ring, implanted at the level of the second end of the conduit, inserted over the internal tube and over which is positioned the external tube and/or the second connecting means, this with the possibility of displacement of this ring. Such an embodiment authorizes, on the one hand, a relative movement of the internal tube with respect to the external tube, due to phenomena of differential thermal dilation and, on the other hand, an adequate positioning of this internal tube with respect to the external tube and the second connecting means, this by avoiding the above-mentioned drawbacks related to the indentations and by adequately delimiting the peripheral volume.
- Other goals and advantages of this invention will clearly appear from the following description relating to embodiments, which are given only by way of indicative and non-restrictive examples.
- This description will be better understood when referring to the attached drawing.
-
FIG. 1 is a cross-sectional view of an exhaust conduit according to the present invention; -
FIG. 2 is a schematic detail view of the second end of the exhaust conduit shown inFIG. 1 . - The present invention relates to the field of the car industry, and more particularly to that of the manufacture of the equipment ensuring the exhaust of gases resulting from the combustion of a fuel by a thermal internal combustion engine.
- As can be seen in the attached figures, the invention relates to an
exhaust conduit 1, which an exhaust line of an internal combustion engine includes. In this respect, it should be noted that such anexhaust conduit 1 is, preferably, comprised of an exhaust downtake, knowing that the present invention is however in no way limited to it. - Such an
exhaust conduit 1 includes aninternal tube 2 inside which the exhaust gases circulate. Thisinternal tube 2 can be made of one single part, but is preferably made from two half shells that are united, in particular through welding, which advantageously allows providing such atube 2 with a complex shape, adapted to its environment, namely inside a motor compartment. - This
exhaust conduit 1 also includes anexternal tube 3 inside which said internal tube is implanted 2, thisexternal tube 3 being made, preferably, from two half shells united to each other, in particular through welding, this over saidinternal tube 2. Such an assembly of half shells allows, here too, providing thisexternal tube 3 with a complex shape and easily and suitably positioning theinternal tube 2 inside thisexternal tube 3. - In this respect, it should be noted that the positioning of the
internal tube 2 inside theexternal tube 3 is carried out so as to delimit, between these twotubes peripheral volume 4 inside which is implanted amaterial 5 designed capable of ensuring a heat insulation of theexhaust conduit 1. - Such an insulation allows, on the one hand, protecting the surroundings of the
exhaust conduit 1 from the high exhaust-gas temperature and, on the other hand, maintaining the gases at high temperature at the exit of theconduit 1, so as to allow the optimal operation of the decontaminating means located downstream of thisconduit 1. - As can be seen in
FIG. 1 , thisexhaust conduit 1 has twoends first end 6 of which located upstream of theconduit 1 as well as asecond end 7 located downstream of thisconduit 1, this according to the direction of circulation of the gases in thisconduit 1. - This
conduit 1 then includes, at the level of thisfirst end 6, first means 8 for connecting thisexhaust conduit 1 to a first exhaust element (not shown) and which, in the case of anexhaust conduit 1 defined by an exhaust downtake, consists of an exhaust-gas collector. - It should be noted that it is, in particular, at the level of this first connecting means 8 that the internal 2 and external 3 tubes are made integral one 2 with the other 3, in particular through welding.
- In this respect, such a first connecting means 8 preferably consists of a flange or the like.
- This
conduit 1 also includes, and at the level of saidsecond end 7, second means 9 for connecting thisexhaust conduit 1 to a second exhaust element (not shown), which, in the case of anexhaust conduit 1 defined by an exhaust downtake, consists of a silencer or a decontaminating element, in particular a particle filter. - In fact, this second connecting means 9 can consist of a part allowing ensuring the connection between a second exhaust element and either the
internal tube 2 or theexternal tube 3, even these twotubes - As can be seen in
FIG. 2 corresponding to a preferred embodiment of the invention, this second connecting means 9, on the one hand, allows ensuring the connection between the second exhaust element and theexternal tube 3 and, on the other hand, preferably consists of a binding band or the like. - According to the invention, this
exhaust conduit 1 includes, proximate itssecond end 7, means 10 for preventing a penetration of exhaust gases, circulating inside theinternal tube 2, into theperipheral volume 4 delimited by thisinternal tube 2 and theexternal tube 3. - In fact, the means 10 for preventing a penetration of gases into the
peripheral volume 4 consist of a ring 11, on the one hand, inserted over theinternal tube 2 and, on the other hand, over which 11 is positioned theexternal tube 2 and/or thesecond connecting means 9. - According to a first embodiment, not shown, the
external tube 2 is inserted over this ring 11. - However and according to a preferred embodiment of the invention that can be seen in
FIG. 2 , thesecond connecting means 9 is inserted over said ring 11. - According to another feature of the invention, this second connecting means 9, on the one hand, is positioned over said ring 11 and, on the other hand, slid over or, and preferably (
FIG. 2 ), inside theexternal tube 3, which this second connectingmeans 9 is made integral with, namely through welding. - It should be noted that said ring 11 is inserted over the
internal tube 2, this with a possibility of displacement with respect to theinternal tube 2 and/or theexternal tube 3 and/or thesecond connecting means 9. - In this respect, it should be noted that the
internal tube 2 is likely to adopt a relative displacement with respect to theexternal tube 3, due to phenomena of thermal differential expansion. Such a relative displacement is, in particular, noticeable at the level of thesecond end 7 of theconduit 1, since thisinternal tube 2 is only made integral with theexternal tube 3 at the level of thefirst end 6 of thisconduit 1. - According to a particular embodiment, this ring 11 is made integral with the
internal tube 2 and is then likely to move with respect to theexternal tube 3 and/or the second connecting means 9. - According to another embodiment, this ring 11 can be made integral with the
external tube 3 and/or the second connecting means 9, so that theinternal tube 2 is likely to move with respect to this ring 11. - However and according to a preferred embodiment of the invention that can be seen in
FIG. 2 , the ring 11 is inserted over theinternal tube 2 with a possibility of displacement with respect to thisinternal tube 2, with respect to theexternal tube 3 and with respect to the second connectingmeans 9. - According to an additional feature, the
exhaust conduit 1 also includes means 12 for maintaining the ring 11 inserted on theinternal tube 2. - Such means 12 advantageously allow maintaining the ring 11 on the
internal tube 2, even during the relative displacements of thisinternal tube 2 with respect to theexternal tube 3 and the second connectingmeans 9. - In fact, such means 12 for maintaining the ring 11 on the
internal tube 2 consist of a shoulder 13 the second connectingmeans 9 includes internally, and which cooperates with this ring 11. - According to another feature of the invention, the ring 11 is made out of a metallic material and consists, in particular, of a mesh wire.
- However and according to another embodiment, this ring 11 can be made out of a heat-insulating material, in particular a fiber-based material having a high thermal strength, for example non-intumescent fibers of the type of those described in patent application EP 906495.
- In this respect, it should be noted that the use of means 10 for impeding a penetration of the exhaust gases into the
peripheral volume 4 advantageously allows avoids arranging, inside thisperipheral volume 4 and along thewhole exhaust conduit 1, an insulatingmaterial 5 particularly resistant to the hot exhaust gases and, hence, particularly expensive. Such an insulating material can, for example, be reserved only for the manufacture of a ring 11, whereas the insulating material arranged in theperipheral volume 4, this along thewhole exhaust conduit 1, except at the level of itssecond end 7, can consist of fibers having a lower mechanical strength and considerably cheaper. - The use of these fibers can also be contemplated with a ring 11 made out of a metallic material such as mentioned above.
- The invention also relates to an exhaust downtake, which an exhaust line of an internal combustion engine includes and which includes or consists of an
exhaust conduit 1 as described above. - Finally, the invention relates to an exhaust line of an internal combustion engine including an
exhaust conduit 1 as described above. - Although the invention has been described in connection with a particular embodiment, it is clearly understood that it is in no way limited to it and that various changes of shape, material and combinations of these various elements can be made, without departing from the scope and the spirit of the invention.
Claims (12)
1. Exhaust conduit, which an exhaust line of an internal combustion engine comprises, and which includes, on the one hand, an external tube and an internal tube positioned inside the external tube so as to delimit, between these two tubes, a peripheral volume inside which is implanted a material for heat insulation of this conduit, on the other hand and at the level of a first end of this exhaust conduit, first means for connecting this exhaust conduit to a first exhaust element, in particular an exhaust-gas collector and, in addition and at the level of a second end of this exhaust conduit, second means for connecting this conduit to a second exhaust element, which said exhaust line comprises, characterized in that it includes, proximate its second end, means for preventing a penetration of the exhaust gases, circulating inside the internal tube, into the peripheral volume delimited by this internal tube and the external tube.
2. Exhaust conduit according to claim 1 , wherein the means for preventing a penetration of the gases into the peripheral volume consist of a ring inserted over the internal tube and over which is positioned the external tube and/or the second connecting means.
3. Exhaust conduit according to claim 2 , wherein the second connecting means is, on the one hand, positioned over said ring and, on the other hand, slid inside or over the external tube, which this second connecting means is made integral with, namely through welding.
4. Exhaust conduit according to claim 2 , wherein the ring is inserted over the internal tube with a possibility of displacement with respect to the internal tube and/or the external tube and/or the second connecting means, while the exhaust conduit includes means for maintaining the ring inserted on this internal tube.
5. Exhaust conduit according to claim 4 , wherein the means for maintaining the ring on the internal tube consist of a shoulder the second connecting means includes internally, and which cooperates with this ring.
6. Exhaust conduit according to claim 2 , wherein the ring is made out of a metallic material and consists, in particular, of a mesh wire.
7. Exhaust conduit according to claim 2 , wherein this ring is made out of a heat-insulating material, in particular a fiber-based material having a high thermal strength.
8. Exhaust conduit according to claim 1 , wherein the internal and external tubes are made integral at the level of the first connecting means, namely by welding.
9. Exhaust conduit according to claim 1 , wherein the first connecting means consists of a flange, namely for connection to an exhaust-gas collector.
10. Exhaust conduit according to claim 1 , wherein the second connecting means consists of a binding band or the like.
11. Exhaust downtake, which an exhaust line of internal combustion engine includes, and which includes or consists of an exhaust conduit according to claim 1 .
12. Exhaust line of an internal combustion engine and which includes an exhaust conduit according to claim 1 .
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0452232 | 2004-10-01 | ||
FR0452232A FR2876147B1 (en) | 2004-10-01 | 2004-10-01 | EXHAUST CONDUIT |
PCT/FR2005/050804 WO2006037920A1 (en) | 2004-10-01 | 2005-10-03 | Exhaust conduit |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090139219A1 true US20090139219A1 (en) | 2009-06-04 |
Family
ID=34950802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/576,492 Abandoned US20090139219A1 (en) | 2004-10-01 | 2005-10-03 | Exhaust conduit |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090139219A1 (en) |
EP (1) | EP1797296A1 (en) |
KR (1) | KR20070072546A (en) |
FR (1) | FR2876147B1 (en) |
WO (1) | WO2006037920A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104364488A (en) * | 2012-04-24 | 2015-02-18 | 珀金斯发动机有限公司 | Exhaust mixer, emissions cleaning module and method |
CN108590828A (en) * | 2018-06-21 | 2018-09-28 | 郑州玖意优创商贸有限公司 | A kind of hush pipe for automobile exhaust pipe |
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---|---|---|---|---|
US3693665A (en) * | 1970-01-28 | 1972-09-26 | Shell Oil Co | Pipeline for the transport of cold liquids |
US3864908A (en) * | 1972-06-19 | 1975-02-11 | Paul G Lahaye | Dry insulated parts and method of manufacture |
US4004888A (en) * | 1972-04-07 | 1977-01-25 | Kali-Chemie Aktiengesellschaft | Exhaust gas cleaning arrangement with a resiliently supported monolithic ceramic catalyzer |
US4998597A (en) * | 1989-07-31 | 1991-03-12 | Manville Corporation | Insulated exhaust pipe attachment means |
US5293743A (en) * | 1992-05-21 | 1994-03-15 | Arvin Industries, Inc. | Low thermal capacitance exhaust processor |
US5495873A (en) * | 1993-10-13 | 1996-03-05 | Benteler Industries, Inc. | Patterned air gap engine exhaust conduit |
US5832723A (en) * | 1995-01-13 | 1998-11-10 | Toyota Jidosha Kabushiki Kaisha | Engine exhaust pipe |
US6209319B1 (en) * | 1998-09-28 | 2001-04-03 | Honda Giken Kogyo Kabushiki Kaisha | Pipe assembly having inner and outer pipes |
US6360782B1 (en) * | 1999-10-08 | 2002-03-26 | Kabushiki Kaisha Yutaka Giken | Exhaust pipe assembly of two-passage construction |
US20080203725A1 (en) * | 2005-05-12 | 2008-08-28 | Emcon Technologies Germany (Augsburg) Gmbh | Air-Gap Insulated Motor Vehicle Exhaust Duct |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07174020A (en) * | 1993-12-20 | 1995-07-11 | Calsonic Corp | Double pipe for exhaust system of vehicle |
JP2004003444A (en) * | 2002-03-27 | 2004-01-08 | Yumex Corp | Exhaust manifold assembly structure |
-
2004
- 2004-10-01 FR FR0452232A patent/FR2876147B1/en active Active
-
2005
- 2005-10-03 WO PCT/FR2005/050804 patent/WO2006037920A1/en active Application Filing
- 2005-10-03 KR KR1020077009524A patent/KR20070072546A/en not_active Application Discontinuation
- 2005-10-03 US US11/576,492 patent/US20090139219A1/en not_active Abandoned
- 2005-10-03 EP EP05810747A patent/EP1797296A1/en not_active Withdrawn
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3693665A (en) * | 1970-01-28 | 1972-09-26 | Shell Oil Co | Pipeline for the transport of cold liquids |
US4004888A (en) * | 1972-04-07 | 1977-01-25 | Kali-Chemie Aktiengesellschaft | Exhaust gas cleaning arrangement with a resiliently supported monolithic ceramic catalyzer |
US3864908A (en) * | 1972-06-19 | 1975-02-11 | Paul G Lahaye | Dry insulated parts and method of manufacture |
US4998597A (en) * | 1989-07-31 | 1991-03-12 | Manville Corporation | Insulated exhaust pipe attachment means |
US5293743A (en) * | 1992-05-21 | 1994-03-15 | Arvin Industries, Inc. | Low thermal capacitance exhaust processor |
US5495873A (en) * | 1993-10-13 | 1996-03-05 | Benteler Industries, Inc. | Patterned air gap engine exhaust conduit |
US5832723A (en) * | 1995-01-13 | 1998-11-10 | Toyota Jidosha Kabushiki Kaisha | Engine exhaust pipe |
US6209319B1 (en) * | 1998-09-28 | 2001-04-03 | Honda Giken Kogyo Kabushiki Kaisha | Pipe assembly having inner and outer pipes |
US6360782B1 (en) * | 1999-10-08 | 2002-03-26 | Kabushiki Kaisha Yutaka Giken | Exhaust pipe assembly of two-passage construction |
US20080203725A1 (en) * | 2005-05-12 | 2008-08-28 | Emcon Technologies Germany (Augsburg) Gmbh | Air-Gap Insulated Motor Vehicle Exhaust Duct |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104364488A (en) * | 2012-04-24 | 2015-02-18 | 珀金斯发动机有限公司 | Exhaust mixer, emissions cleaning module and method |
US9638079B2 (en) | 2012-04-24 | 2017-05-02 | Perkins Engines Company Limited | Exhaust mixer, emissions cleaning module and method |
CN108590828A (en) * | 2018-06-21 | 2018-09-28 | 郑州玖意优创商贸有限公司 | A kind of hush pipe for automobile exhaust pipe |
Also Published As
Publication number | Publication date |
---|---|
KR20070072546A (en) | 2007-07-04 |
FR2876147A1 (en) | 2006-04-07 |
FR2876147B1 (en) | 2011-04-22 |
WO2006037920A1 (en) | 2006-04-13 |
EP1797296A1 (en) | 2007-06-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FAURECIA SYSTEMES D'ECHAPPEMENT, S.A.S., FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAGET, MARC;REEL/FRAME:019104/0639 Effective date: 20070327 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |