EP3708798A1 - Collecteur de gaz d'échappement isolé par une fente d'air - Google Patents

Collecteur de gaz d'échappement isolé par une fente d'air Download PDF

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Publication number
EP3708798A1
EP3708798A1 EP19162554.0A EP19162554A EP3708798A1 EP 3708798 A1 EP3708798 A1 EP 3708798A1 EP 19162554 A EP19162554 A EP 19162554A EP 3708798 A1 EP3708798 A1 EP 3708798A1
Authority
EP
European Patent Office
Prior art keywords
gap
exhaust manifold
air
inner element
core
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.)
Pending
Application number
EP19162554.0A
Other languages
German (de)
English (en)
Inventor
Ilias PAPADIMITRIOU
Christian Graf
Kurt TRACK
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.)
GF Casting Solutions AG
Original Assignee
GF Casting Solutions AG
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 GF Casting Solutions AG filed Critical GF Casting Solutions AG
Priority to EP19162554.0A priority Critical patent/EP3708798A1/fr
Priority to CN202010175944.8A priority patent/CN111691961A/zh
Publication of EP3708798A1 publication Critical patent/EP3708798A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/102—Other arrangements or adaptations of exhaust conduits of exhaust manifolds 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
    • 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
    • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
    • 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
    • F01N13/1877—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal the channels or tubes thereof being made integrally with the housing
    • 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
    • F01N2470/28—Tubes being formed by moulding or casting x

Definitions

  • the invention relates to an air-gap-insulated exhaust manifold for an internal combustion engine in a motor vehicle and its manufacturing method including an inner element, the inner element having at least two tubular hollow bodies made of sheet metal, the hollow bodies being slidably connected to one another and an outer element, the outer element being spaced from the inner element by an air gap is, wherein the outer element is designed as a one-piece cast part.
  • Air-gap-insulated exhaust manifolds are therefore known from the prior art, which are usually welded together from several high-alloy sheet metal parts, which means that such exhaust manifolds are expensive to produce.
  • the WO 2006/097187 discloses such an air-gap-insulated exhaust manifold made from sheet metal.
  • Exhaust manifolds are also known from the prior art which have an inner tube made of sheet metal, which withstands the high temperatures of the exhaust gas and is surrounded by a cast part.
  • the production time for such an exhaust manifold compared to a complete sheet metal version is shorter and is therefore more suitable for series production, but very high demands are made on the cast material, since the high temperatures that the exhaust gas has on the inner pipe via the contact points between The inner tube and the cast outer jacket are passed on directly via the heat conduction or conduction, and the cast outer jacket is therefore also subjected to high temperatures.
  • the object of the invention is to propose a device and an associated method which provides an air-gap-insulated exhaust manifold which, thanks to its structure, enables cost-effective implementation, both in terms of the materials to be used and in the manufacturing process, and yet can be used for gasoline engines with high exhaust gas temperatures .
  • the air-gap-insulated exhaust manifold has an inner element, the inner element being formed from at least two tubular hollow bodies made of sheet metal.
  • the tubular hollow bodies preferably have several nozzles, which are inlet nozzles and / or outlet nozzles.
  • the hollow bodies, which are connected to one another to form an inner element preferably have a different configuration of the course of the connecting pieces in order to enable an optimal configuration or course with regard to the available installation space in an engine of the exhaust manifold.
  • the tubular hollow bodies connected to one another to form an inner element are arranged displaceably to one another, preferably in the axial direction corresponding to the connection point of the interconnected hollow bodies, this enables the inner element to react to the temperature change in the exhaust manifold and to expand or contract accordingly or that the socket connection has a allows axial displacement of the hollow body to each other.
  • the exhaust manifold has an outer element which is spaced from the inner element by an air gap, the outer element being designed as a one-piece cast part. To achieve the most effective insulation possible through the air gap between the inner element and To achieve the outer element, there is no direct contact between the inner element and the outer element. The outer element does not touch the inner element at any point, so that heat conduction or conduction is avoided and the air gap between them ensures optimal insulation.
  • tubular hollow bodies are made from sheet steel.
  • the air-gap-insulated exhaust manifold according to the invention has an outer element made of cast iron, preferably nodular cast iron. This material is well suited for automotive engineering.
  • the invention is preferably characterized in that the tubular hollow bodies of the inner element are slidably connected to one another by means of a sleeve connection.
  • a socket connection is characterized in that a pipe end, which has not undergone any deformation and thus corresponds to the pipe diameter of the hollow body, is pushed into a widened pipe end.
  • the pipe ends are arranged concentrically to one another and can move axially to each other because the expanded pipe end leads the inserted pipe end over the length of the socket connection, whereby an expansion or displacement of the hollow bodies to each other, which act on the exhaust manifold due to the high temperatures, is easily possible through the socket connection, as well as that Contraction when the temperature is reduced.
  • the air-gap-insulated exhaust manifold according to the invention has spacer elements on the outer surface of the inner element. The spacer elements should ensure that the inner element does not touch the outer element at any point.
  • the tubular hollow bodies connected to one another to form the inner element preferably have a socket connection and are preferably plugged together. This allows them to move axially to one another according to the temperature change.
  • Core sand is preferably applied to the outer surface of the inner element; the core sand enables the air gap between the inner element and the outer element to be made from cast.
  • the core which is formed from the inner element and the surrounding core sand, is placed in a casting mold, preferably a sand casting mold.
  • the casting mold is then filled with the melt and the core is poured over, whereby the melt does not touch the inner element at any point.
  • the cast part or the exhaust manifold according to the invention is shaped and the core sand is removed.
  • the core sand is preferably shaken out via the annular gap on the nozzle, which is formed by the air gap between the inner element and the outer element. This means that no additional openings are required in the cast outer element.
  • the inner element preferably has ends of the connecting pieces of the inner element protruding beyond the outer element after the shaping, the protruding connecting pieces being separated after the shaping and cooling.
  • the adapter flange is attached to each socket. It is advantageous if the adapter flange is welded to the socket of the inner element.
  • the outer element preferably has cast-on flanges on which the adapter flanges rest and in turn serve to ensure the air gap between the inner element and the outer element.
  • the air-gap-insulated exhaust manifold 1 according to the invention is shown.
  • the exhaust manifold 1 shown has several inlet connections 9 such as an outlet connection 10, the embodiment shown being only to be regarded as a possible design and the exhaust manifold according to the invention can also have other designs.
  • the air-gap-insulated exhaust manifold 1 has an inner element 2, the inner element 2 being formed from at least two tubular hollow bodies 4.
  • the hollow bodies 4 are tubes which preferably have several branches.
  • the hollow bodies 4 connected to one another to form an inner element 2 are preferably not configured identically, but rather have different branches.
  • the tubular hollow bodies 4 are formed from sheet metal, preferably a sheet steel.
  • the hollow bodies 4 preferably have a sleeve connection 8 for mutual displaceability; this is shown in FIG Fig. 3 evident.
  • the socket connection 8 is preferably formed by an expanded pipe end at one end of the one hollow body 4 and a non-deformed pipe end which is pushed into the expanded pipe end.
  • the exhaust manifold 1 has an outer element 3, the outer element 3 being spaced apart from the inner element 2 by an air gap 5.
  • the outer element 3 is designed as a one-piece cast part and surrounds it Inner element 2. In Fig. 3 it can be clearly seen that the cast outer element 3 does not contact the inner element 2 anywhere.
  • the adapter flanges 12 which are mounted after the casting process has been completed, serve to distance the inner element 2 and outer element 3 and keep the air gap 5 constant.
  • Fig. 4 shows the inner element 2 before further processing into the exhaust manifold 1 according to the invention.
  • the inner element 2 has at least two tubular hollow bodies 4 which are made of sheet metal.
  • the tubular hollow bodies 4 are displaceably connected to one another, whereby they are preferably axially displaceably connected to one another in order to take into account the heating and cooling of the exhaust manifold and to expand and contract accordingly or to be able to move towards one another.
  • the connection of the hollow bodies 4 is preferably implemented via a socket connection 8, other types of connections also being conceivable which allow the inner element 2 or the hollow bodies 4 to be lengthened or shortened.
  • the inner element 2 is then placed in a mold or a core sleeve 15, which is shown in Fig. 5 can be seen.
  • the core sleeve 15 has the negative shape of the core into which the core sand 18 is poured and which together with the inner element 2 forms the core 17.
  • Fig. 6 shows the molded core 17 with the surrounding core sand 18, which serves as a placeholder for the air gap 5.
  • the core 17 is placed in a casting mold 20.
  • Out Fig. 8 it can be seen that the negative shape 19 of the outer element 3 is depicted in the casting mold 20 and that a gap is consequently formed between the outer surface of the core 17 and the molding sand in the casting mold 20, which is filled with casting material and thus forms the outer element 3.
  • the casting melt which is placed around the core 17 and thus forms the outer element 3, is then poured into the casting mold 20.
  • the exhaust manifold is molded from the casting mold 20.
  • the core sand 18 is still located between the outer element 3 and the inner element 2; this is preferably shaken out of the exhaust manifold 1 by shaking or shaking.
  • the core sand 18 can flow out through the annular gap 14, can be seen in FIG Fig. 9 .
  • the air gap 5 is then present between the inner element 2 and the outer element 3, which ensures the insulation of the exhaust manifold 1.
  • the protruding ends 21 of the connecting pieces 9, 10 of the inner element 2 are then cut off. Also visible in Fig.
  • the adapter flanges 12 are attached to the connecting pieces 9, 10.
  • the adapter flanges 12 are preferably welded to the connecting pieces 9, 10 of the inner element 2. It is advantageous if the outer element 3 is designed in such a way that it has flanges formed on the nozzle 9, 10, which are part of the one-piece outer element 3 made of cast iron, so that the adapter flanges 12 can rest thereon and ensure a high level of stability of the exhaust manifold according to the invention what good of the Figures 1 to 3 is recognizable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP19162554.0A 2019-03-13 2019-03-13 Collecteur de gaz d'échappement isolé par une fente d'air Pending EP3708798A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19162554.0A EP3708798A1 (fr) 2019-03-13 2019-03-13 Collecteur de gaz d'échappement isolé par une fente d'air
CN202010175944.8A CN111691961A (zh) 2019-03-13 2020-03-13 气隙隔绝的排气弯管

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19162554.0A EP3708798A1 (fr) 2019-03-13 2019-03-13 Collecteur de gaz d'échappement isolé par une fente d'air

Publications (1)

Publication Number Publication Date
EP3708798A1 true EP3708798A1 (fr) 2020-09-16

Family

ID=65802008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19162554.0A Pending EP3708798A1 (fr) 2019-03-13 2019-03-13 Collecteur de gaz d'échappement isolé par une fente d'air

Country Status (2)

Country Link
EP (1) EP3708798A1 (fr)
CN (1) CN111691961A (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979000623A1 (fr) * 1978-02-15 1979-09-06 Caterpillar Tractor Co Collecteur d'echappement isolant
WO2006097187A1 (fr) 2005-03-14 2006-09-21 Emcon Technologies Germany (Augsburg) Gmbh Collecteur d'echappement isole par une couche d'air
FR2886338A1 (fr) * 2005-05-24 2006-12-01 Renault Sas Collecteur d'echappement a double paroi pour moteur a combustion interne
US20080083216A1 (en) 2004-09-29 2008-04-10 Renault S.A.S Double-walled exhaust manifold
DE102014014846A1 (de) * 2014-10-07 2015-04-23 Daimler Ag Luftspaltisolierter Abgaskrümmer und Verfahren zur Herstellung eines luftspaltisolierten Abgaskrümmers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2361539A1 (fr) * 1975-04-26 1978-03-10 Hinderks M V Enveloppe pour moteur de combustion interne
DE19526086A1 (de) * 1995-07-18 1997-01-23 Porsche Ag Abgasanlage einer Brennkraftmaschine und Verfahren zur Herstellung der Sammelkammer einer Abgasanlage
DE102007032046A1 (de) * 2007-07-10 2009-01-15 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Endrohr für eine Abgasanlage eines Kraftfahrzeugs
DE102013109446B4 (de) * 2013-08-30 2015-11-26 Benteler Automobiltechnik Gmbh Abgaskrümmer mit Isolationshülse
DE102015203001B3 (de) * 2015-02-19 2016-03-10 Ford Global Technologies, Llc Wärmetauscheranordnung sowie Abgassystem für eine Brennkraftmaschine eines Kraftfahrzeugs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979000623A1 (fr) * 1978-02-15 1979-09-06 Caterpillar Tractor Co Collecteur d'echappement isolant
US20080083216A1 (en) 2004-09-29 2008-04-10 Renault S.A.S Double-walled exhaust manifold
WO2006097187A1 (fr) 2005-03-14 2006-09-21 Emcon Technologies Germany (Augsburg) Gmbh Collecteur d'echappement isole par une couche d'air
FR2886338A1 (fr) * 2005-05-24 2006-12-01 Renault Sas Collecteur d'echappement a double paroi pour moteur a combustion interne
DE102014014846A1 (de) * 2014-10-07 2015-04-23 Daimler Ag Luftspaltisolierter Abgaskrümmer und Verfahren zur Herstellung eines luftspaltisolierten Abgaskrümmers

Also Published As

Publication number Publication date
CN111691961A (zh) 2020-09-22

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