EP2041419B1 - Exhaust gas cooler, in particular for a motor vehicle - Google Patents

Exhaust gas cooler, in particular for a motor vehicle Download PDF

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Publication number
EP2041419B1
EP2041419B1 EP07765061.2A EP07765061A EP2041419B1 EP 2041419 B1 EP2041419 B1 EP 2041419B1 EP 07765061 A EP07765061 A EP 07765061A EP 2041419 B1 EP2041419 B1 EP 2041419B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
housing
gas cooler
seal
outlet
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.)
Not-in-force
Application number
EP07765061.2A
Other languages
German (de)
French (fr)
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EP2041419A1 (en
Inventor
Peter Geskes
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Mahle Behr GmbH and Co KG
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Publication date
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Publication of EP2041419A1 publication Critical patent/EP2041419A1/en
Application granted granted Critical
Publication of EP2041419B1 publication Critical patent/EP2041419B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/11—Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F28F9/0224—Header boxes formed by sealing end plates into covers
    • F28F9/0226—Header boxes formed by sealing end plates into covers with resilient gaskets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass

Definitions

  • the present invention relates to an exhaust gas cooler, in particular for a motor vehicle, according to the preamble of claim 1.
  • the FIG. 1 out DE 20316688 U1 discloses such exhaust gas cooling.
  • exhaust gas recirculation is increasingly used to reduce the emission of pollutants, with the recirculated exhaust gas, which in the context of the invention is also understood to mean an exhaust gas / air mixture, being necessarily cooled.
  • exhaust gas coolers place high demands on the temperature resistance of the materials used.
  • it is generally desirable to form parts such as a coolant-carrying housing made of a material that can be inexpensively, easily and inexpensively brought into elaborate form.
  • DE 10 2004 045 016 A1 describes an exhaust gas cooler for a motor vehicle, in which a block of exchanger tubes is in each case accommodated in end pieces in bottom sections, which are in turn connected on the one hand to an inlet diffuser and on the other hand to an outlet diffuser.
  • This arrangement is mounted in a plastic housing, wherein the plastic housing rests radially on the inlet diffuser and abuts axially on the outlet-side bottom piece, wherein the outlet-side bottom piece is fixed by means of a flanging on the plastic housing.
  • Such an arrangement is problematic in terms of assembly costs and the heat input of hot exhaust gas into the plastic housing in particular in the inlet area.
  • this preassembled unit also comprises the outlet diffuser, so that no more welding work in the immediate vicinity of the housing with the risk of heat input are required after the housing assembly. As a result, the reject rate in the production of the exhaust gas cooler is significantly reduced.
  • the inlet diffuser is held by at least one fastening means, in particular a screw, in a substantially axial direction against the housing, wherein the first and the second seal are subjected to force by the holder.
  • the fastening means is partially guided in a sleeve which has a collar of the Passes through housing.
  • the first seal is a high temperature resistant seal, in particular of metal.
  • the second seal has a temperature resistance up to at least about 200 ° C, wherein the second seal is made in particular of silicone.
  • the second seal may be a metal seal or made of another suitable material.
  • a third seal is provided between the housing and at least one of the two, the exit-side bottom piece or the outlet diffuser.
  • the third seal is subjected to force substantially perpendicular to the axial direction.
  • a simple assembly by inserting a prefabricated unit into the housing can generally be carried out, wherein in addition a large thermal change in length of the various components of the exhaust gas cooler can be compensated.
  • the third seal is slidably received for this purpose in the axial direction, so that a thermal expansion of the exhaust gas cooler in this direction can be compensated.
  • the exit-side bottom piece has a substantially extending in the axial direction Abkragung.
  • Such Abkragung can support the housing in a simple manner, the bottom piece and its Abkragung are in direct contact with the coolant, so that there is no danger of harmful heat input into the housing material in this region of the system of the housing with the outlet side bottom piece.
  • the housing is provided with an exit-side end region via a fastening means, in particular a screw, at least one of the two, exit-side bottom piece or outlet diffuser set.
  • a fastening means in particular a screw, at least one of the two, exit-side bottom piece or outlet diffuser set.
  • the fastening means can also be a rivet, a clamp, a bead, a revolving tire or the like.
  • the housing has a form-fitting structure, in particular a taper, at an exit-side end region, wherein the outlet diffuser is positively supported against the structure.
  • a third seal is arranged between the positive-locking structure and the outlet diffuser.
  • a sticking agent is arranged on the outlet diffuser, wherein the holding means is connected to an outlet-side end region of the housing.
  • the holding means comprises at least one resilient sheet metal, wherein the sheet is fixed in an elastically biased state at the end portion of the housing.
  • the housing is at least partially made of a plastic from the group polyamide (PA).
  • PA group polyamide
  • PPA Polyphtalamide
  • PPS polyphenylene selenide
  • the cooler may be inserted into an aluminum casting module or housing, which for example attached to a motor, as is preferably bolted.
  • an aluminum casting module or housing which for example attached to a motor, as is preferably bolted.
  • a preferred embodiment is characterized in that a holding means is arranged on the outlet diffuser, wherein the holding means is connectable to an exit-side end portion of the housing, wherein preferably the holding means comprises at least one resilient sheet, wherein the sheet in an elastically biased state at the end portion of the housing is fixed, wherein particularly preferably the retaining means is slidable over the outlet diffuser and positively held by the outlet diffuser.
  • a further preferred embodiment is characterized in that the housing consists at least partially of a plastic from the group polyamide (PA), polyphthalamide (PPA) and polyphenylene sulfide (PPS).
  • PA polyamide
  • PPA polyphthalamide
  • PPS polyphenylene sulfide
  • a further preferred embodiment is characterized in that the housing is part of an entire module or entire housing, which is directly or indirectly fastened to a motor, in particular as can be screwed to the motor.
  • the exhaust gas cooler according to Fig. 1 includes an inlet with respect to the exhaust gas inlet inlet diffuser 1, which in the present case a known per se actuator 2 for the selective distribution of the exhaust gas flow to exchanger tubes and / or a bypass channel.
  • the actuator 2 is optional and is mainly used in internal combustion engines in passenger cars.
  • a bundle of parallel exchanger tubes 3 is welded at each of the ends of the exchanger tubes to an inlet-side bottom piece 4 and corresponding to an outlet-side bottom piece 5.
  • the exchanger tubes 3 and the bottom pieces 4, 5 each consist of a non-susceptible steel or other suitable for guiding a hot exhaust gas stream material.
  • a conically tapered outlet diffuser 6 is welded.
  • a housing 7 of the exhaust gas cooler consists of a plastic and surrounds the bundle of exchanger tubes 3, wherein the housing 7 is sealed on the one hand with respect to the inlet side bottom piece 4 and on the other hand with respect to the outlet side bottom piece 5 so that the housing 7, bottom pieces 4, 5 and the exchanger tubes in total delimiting a volume to guide a coolant.
  • the housing 7 has an inlet 7a and an outlet 7b for the coolant, so that the housing 7 can be flowed through by the coolant, in particular the coolant of a main cooling circuit of an internal combustion engine of the motor vehicle.
  • both the walls of the exchanger tubes 3 and with respect to the enclosed volume inner surfaces of the bottom pieces 4, 5 with the coolant in direct contact.
  • the exhaust gas cooler is of the type according to an I-flow cooler, in which the exchanger tubes 3 are substantially straight and are arranged parallel to one another. Through the exchanger tubes 3 and the flow direction of the exhaust gas through the tubes an axial direction of the exhaust gas cooler is defined.
  • the inlet side bottom piece 4 and the housing 7 in the axial direction kraftbeetzschlagt by means of a first seal 8 and a second seal 9 sealingly fixed to each other.
  • the inlet-side bottom piece 4 has a radial Abkragung 4a, on the exhaust side, the first seal 8 and the coolant side, the second seal 9 is placed.
  • the Abkragung 4a and the seals 8, 9 have grooves, beads, cutting or other known means for positioning and sealing.
  • the housing 7 is attached by means of a formed on it Abkragung 7c.
  • the Abkragitch 1 a, 4 a, 7 c have overlapping perforations or holes that are penetrated by trained as screws with nuts fasteners 10. Distributed over the circumference several screws 10 are provided for secure fixing.
  • the fastener may also be a rivet, staple or other suitable means.
  • a sleeve is also inserted into the openings, which passes through the opening of the collar of the housing 7c and rests on the collar of the bottom piece 4a.
  • the first seal 8 is a metal gasket, for. Example of copper or another temperature-resistant metal with respect to the inlet temperature of the exhaust gas.
  • the second seal 9 is a silicone gasket which is temperature resistant up to a temperature of about 200 ° C. Due to the sleeve, not shown, tightening the screw 10 by means of a nut and possibly provided washers to a summary compression of the housing collar 7c and second seal 9 by a stroke defined by the sleeve dimension, so that the soft materials of the housing and the second seal 9 are not overloaded.
  • the metal seal 8, however, can be pressed with a higher force, which is given by the tightening torque of the screw. Overall, the sealing of inlet diffuser 1, bottom piece 4 and inlet end of the housing 7 thus takes place in the axial direction.
  • a circumferential nose 7e of the housing arranged in the exit direction behind the seal 11 snaps into a corresponding groove or groove 5b of the bottom piece 5 in order to reduce any possible vibration of the parts of the exhaust gas cooler relative to one another.
  • the housing 7 has over its entire length a free passage cross-section, wherein the bottom piece 5 does not collide with its Abkragung 5a and the outlet diffuser 6 with this free cross-section.
  • the first seal 8 is placed on the first bottom piece 4, the inlet diffuser 1 is placed and the screws 10 are inserted and tightened with the sleeves.
  • the radial sealing of the collar 5a of the bottom piece 5 relative to the housing 7 by means of the third seal 11 also allows compensation of thermal expansion of the exchanger tubes 3 relative to the housing 7.
  • the seal 11, in the groove 7d in the axial direction relative to the housing 7 is fixed, slide on the collar 5 a of the bottom piece 5. It can also be provided that the seal 11 is fixed relative to the collar 5a and slides relative to the housing 7 or slides with respect to both elements.
  • the exit-side end portion of the housing 7 is similar to the second embodiment secured by screws 12, the screws 12 are screwed into nuts 13 which are fixed on a conical wall portion 6a of the outlet diffuser 6, in particular by welding.
  • the material thickness of the outlet diffuser 6 it may also be blind thread in the wall 6a.
  • An execution as in Fig. 3 it is advantageous if the material thicknesses of, for example, the bottom piece 5 are not sufficient to provide screw thread.
  • a positive-locking structure at its outlet end portion which in the present case as a taper 14th of the housing 7 is formed.
  • the taper 14 corresponds to a conical portion 6a of the wall of the outlet diffuser 6.
  • a gasket 11a is inserted into a housing groove.
  • the gasket 11a may be provided alternatively or in addition to the third gasket 11 of the first embodiment.
  • the exhaust gas outlet side has a significantly lower temperature than the inlet side. Typical temperature values for the inlet-side exhaust gas are 600 ° C to 700 ° C, whereas the outlet-side exhaust gas has temperatures of typically 150 ° C to 160 ° C.
  • the heating of the outlet diffuser 6 is therefore limited, so that the housing 7 and an elastic, possibly made of silicone seal 11a may rest against the wall 6a, without being destroyed.
  • Particularly uncritical is the principle of the fourth embodiment in the case in which the housing 7 is made of aluminum.
  • the seal 11a may also be arranged on the adjacent flange of the cylindrical segment of the outlet diffuser, so that then the housing then further down to nearer to the connection flange extends and surrounds a portion of the cylindrical segment. As a result, thermal expansions of the radiator block can be further compensated.
  • the housing 7 and the outlet side has a radial Abkragung 15 on which by means of screws 16 resilient plates 17 are fixed, which are fixed to the circumference of a wall 6a of the outlet diffuser 6.
  • the elastic sheets 17 can in principle be welded into the housing 7 on the wall 6a after the assembly has been pushed in, since the latter is far away from the housing 7.
  • the sheets 17 are fixed as shown by the dotted lines before inserting the unit into the housing 7 on the wall 6a and bent so that they first free Do not cover the cross-section of the housing 7. Only after inserting the structural unit into the housing 7, they are in accordance with the arrows in Fig. 5 bent elastically and fastened by means of screws 16 on the collar 15. As a result, the housing 7 is securely held in the exit-side end region with respect to the outlet diffuser 6 and the bottom piece 5, wherein due to the spring elasticity of the sheets 17 there is still a good compensating thermal expansion.
  • the sixth embodiment according to Fig. 6 is similar in its construction to the fifth embodiment, instead of the resilient plates now a holding means 18 is pushed over the outlet diffuser 6 and bolted to the Abkragung 15 of the housing 7.
  • the holding means 18 is formed as a rotationally symmetrical funnel, which rests with its smaller opening circumferentially on a conical wall 6a of the outlet diffuser 6. This also makes it possible to mount the outlet-side end region of the housing 7 in an elastically flexible manner relative to the bottom piece 5 and the outlet diffuser 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Exhaust Silencers (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Die vorliegende Erfindung betrifft einen Abgaskühler, insbesondere für ein Kraftfahrzeug, nach dem Oberbegriff des Anspruchs 1. Die Figur 1 aus DE 20316688 U1 offenbart einen solchen Abgaskühlen.The present invention relates to an exhaust gas cooler, in particular for a motor vehicle, according to the preamble of claim 1. The FIG. 1 out DE 20316688 U1 discloses such exhaust gas cooling.

Bei Verbrennungsmotoren insbesondere von Kraftfahrzeugen wird zunehmend Abgasrückführung zur Reduktion der Schadstoffemission eingesetzt, wobei das rückgeführte Abgas, unter dem im Sinne der Erfindung auch ein Abgas-Luft-Gemisch verstanden wird, notwendig gekühlt werden muss. Grundsätzlich stellen Abgaskühler hohe Anforderungen bezüglich der Temperaturfestigkeit der verwendeten Materialien. Andererseits ist es grundsätzlich gewünscht, Teile wie etwa ein kühlmittelführendes Gehäuse aus einem Material auszubilden, das preiswert, leichtbauend und kostengünstig in aufwendige Form bringbar ist.In internal combustion engines, in particular of motor vehicles, exhaust gas recirculation is increasingly used to reduce the emission of pollutants, with the recirculated exhaust gas, which in the context of the invention is also understood to mean an exhaust gas / air mixture, being necessarily cooled. Basically, exhaust gas coolers place high demands on the temperature resistance of the materials used. On the other hand, it is generally desirable to form parts such as a coolant-carrying housing made of a material that can be inexpensively, easily and inexpensively brought into elaborate form.

DE 10 2004 045 016 A1 beschreibt einen Abgaskühler für ein Kraftfahrzeug, bei dem ein Block aus Tauscherrohren jeweils endseitig in Bodenstücken aufgenommen ist, welche wiederum einerseits mit einem Eintrittsdiffusor und andererseits mit einem Austrittsdiffusor verbunden sind. Diese Anordnung ist in einem Kunststoffgehäuse angebracht, wobei das Kunststoffgehäuse an dem Eintrittsdiffusor radial anliegt und an dem austrittsseitigen Bodenstück axial anstößt, wobei das austrittsseitige Bodenstück mittels einer Umbördelung an dem Kunststoffgehäuse festgelegt ist. Eine solche Anordnung ist problematisch hinsichtlich des Montageaufwandes und des Wärmeeintrags des heißen Abgases in das Kunststoffgehäuse insbesondere im Einlassbereich. DE 10 2004 045 016 A1 describes an exhaust gas cooler for a motor vehicle, in which a block of exchanger tubes is in each case accommodated in end pieces in bottom sections, which are in turn connected on the one hand to an inlet diffuser and on the other hand to an outlet diffuser. This arrangement is mounted in a plastic housing, wherein the plastic housing rests radially on the inlet diffuser and abuts axially on the outlet-side bottom piece, wherein the outlet-side bottom piece is fixed by means of a flanging on the plastic housing. Such an arrangement is problematic in terms of assembly costs and the heat input of hot exhaust gas into the plastic housing in particular in the inlet area.

Es ist die Aufgabe der Erfindung, einen Abgaskühler anzugeben, bei dem ein insbesondere nicht hochtemperaturfestes Gehäuse auf einfache Weise montierbar ist und ein Wärmeeintrag in das Gehäuse insbesondere einlassseitig verringert ist.It is the object of the invention to provide an exhaust gas cooler, in which a particular non-high temperature resistant housing can be mounted in a simple manner and heat input into the housing is reduced in particular inlet side.

Diese Aufgabe wird für einen eingangs genannten Abgaskühler erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Durch das Vorsehen zweier Dichtungsebenen, wobei eine erste Dichtung das Abgas gegen die Umgebung abdichtet und die zweite Dichtung das Gehäuse gegen das eintrittsseitige Bodenstück abdichtet, ist eine verbesserte Isolierung und Verteilung der Wärme der eintrittsseitig sehr heißen Abgase gegenüber dem Gehäusematerial erreicht. Zudem ist eine solche Anordnung einfach und sicher montierbar, wobei insbesondere nach der Verbindung des Gehäuses mit den restlichen Teilen des Abgaskühlers keine Hitze eintragende Maßnahmen wie etwa Schweißen oder Löten mehr erforderlich sind. Hierzu ist in bevorzugter Ausführung vorgesehen, dass das erste Bodenstück, das zweite Bodenstück und die Tauscherrohre eine vormontierte, insbesondere verschweißte Einheit ausbilden, die in der axialen Richtung in das Gehäuse einschiebbar ist.This object is achieved according to the invention for an abovementioned exhaust gas cooler with the characterizing features of claim 1. By providing two sealing levels, wherein a first seal seals the exhaust gas against the environment and the second seal seals the housing against the inlet-side bottom piece, improved insulation and distribution of the heat of the inlet side very hot exhaust gases is achieved with respect to the housing material. In addition, such an arrangement is easy and safe to mount, in particular after the connection of the housing with the remaining parts of the exhaust gas cooler heat-carrying measures such as welding or soldering are no longer required. For this purpose, it is provided in a preferred embodiment that the first bottom piece, the second bottom piece and the exchanger tubes form a preassembled, in particular welded unit, which can be inserted into the housing in the axial direction.

Besonders bevorzugt umfasst diese vormontierte Einheit zudem den Austrittsdiffusor, so dass nach der Gehäusemontage keinerlei Schweißarbeiten in unmittelbarer Umgebung des Gehäuses mit der Gefahr eines Wärmeeintrags mehr erforderlich sind. Hierdurch wird die Ausschussrate bei der Produktion des Abgaskühlers deutlich verringert.Particularly preferably, this preassembled unit also comprises the outlet diffuser, so that no more welding work in the immediate vicinity of the housing with the risk of heat input are required after the housing assembly. As a result, the reject rate in the production of the exhaust gas cooler is significantly reduced.

In zweckmäßiger Ausgestaltung ist der Eintrittsdiffusor über zumindest ein Befestigungsmittel, insbesondere eine Schraube, in im Wesentlichen axialer Richtung gegen das Gehäuse gehalten, wobei die erste und die zweite Dichtung durch die Halterung kraftbeaufschlagt sind. Besonders bevorzugt ist das Befestigungsmittel teilweise in einer Hülse geführt, die einen Kragen des Gehäuses durchgreift. Insgesamt ist hierdurch eine einfache Montage ermöglicht, wobei durch die Hülse mit einfachen Mitteln eine unterschiedliche Kraftbeaufschlagung der beiden Dichtungen realisierbar ist, wobei insbesondere die Kraftbeaufschlagung des aus weichem Material wie etwa Kunststoff oder Aluminium bestehenden Gehäuses durch einen Anschlag an der Hülse limitiert ist.In an advantageous embodiment, the inlet diffuser is held by at least one fastening means, in particular a screw, in a substantially axial direction against the housing, wherein the first and the second seal are subjected to force by the holder. Particularly preferably, the fastening means is partially guided in a sleeve which has a collar of the Passes through housing. Overall, this makes a simple installation possible, whereby by the sleeve with simple means a different application of force of the two seals can be realized, in particular the application of force of the soft material such as plastic or aluminum existing housing is limited by a stop on the sleeve.

Vorteilhaft ist die erste Dichtung eine hochtemperaturfeste Dichtung, insbesondere aus Metall. Weiterhin vorteilhaft weist die zweite Dichtung eine Temperaturfestigkeit bis zumindest etwa 200 °C auf, wobei die zweite Dichtung insbesondere aus Silikon besteht. Alternativ kann auch die zweite Dichtung eine Metalldichtung sein oder aus einem anderen geeigneten Material bestehen.Advantageously, the first seal is a high temperature resistant seal, in particular of metal. Further advantageously, the second seal has a temperature resistance up to at least about 200 ° C, wherein the second seal is made in particular of silicone. Alternatively, the second seal may be a metal seal or made of another suitable material.

In einer bevorzugten Ausführungsform ist zwischen dem Gehäuse und zumindest einem von beiden, dem austrittsseitigen Bodenstück oder dem Austrittsdiffusor, eine dritte Dichtung vorgesehen. Besonders bevorzugt ist dabei die dritte Dichtung im Wesentlichen senkrecht zu der axialen Richtung kraftbeaufschlagt. Hierdurch kann generell eine einfache Montage durch Einschieben einer vorgefertigten Einheit in das Gehäuse erfolgen, wobei zudem eine große thermische Längenänderung der verschiedenen Komponenten des Abgaskühlers ausgeglichen werden kann. Vorteilhaft ist die dritte Dichtung hierzu in axialer Richtung gleitfähig aufgenommen, so dass eine thermische Ausdehnung des Abgaskühlers in dieser Richtung ausgleichbar ist.In a preferred embodiment, a third seal is provided between the housing and at least one of the two, the exit-side bottom piece or the outlet diffuser. Particularly preferably, the third seal is subjected to force substantially perpendicular to the axial direction. As a result, a simple assembly by inserting a prefabricated unit into the housing can generally be carried out, wherein in addition a large thermal change in length of the various components of the exhaust gas cooler can be compensated. Advantageously, the third seal is slidably received for this purpose in the axial direction, so that a thermal expansion of the exhaust gas cooler in this direction can be compensated.

Bei einer zweckmäßigen Konstruktion weist das austrittsseitige Bodenstück eine sich im Wesentlichen in axialer Richtung erstreckende Abkragung auf. Eine solche Abkragung kann auf einfache Weise das Gehäuse stützen, wobei das Bodenstück und seine Abkragung in unmittelbarem Kontakt mit dem Kühlmittel stehen, so dass in diesem Bereich der Anlage des Gehäuses mit dem austrittsseitigen Bodenstück keine Gefahr eines schädlichen Wärmeeintrags in das Gehäusematerial besteht.In an expedient construction, the exit-side bottom piece has a substantially extending in the axial direction Abkragung. Such Abkragung can support the housing in a simple manner, the bottom piece and its Abkragung are in direct contact with the coolant, so that there is no danger of harmful heat input into the housing material in this region of the system of the housing with the outlet side bottom piece.

Bei einer allgemein bevorzugten Ausführungsform ist das Gehäuse mit einem austrittsseitigen Endbereich über ein Befestigungsmittel, insbesondere eine Schraube, zumindest einem von beiden, austrittsseitiges Bodenstück oder Austrittsdiffusor, festgelegt. Dies verbessert insgesamt die mechanische Festlegung des Gehäuses und verhindert auch bei hoher Lebensdauer des Abgaskühlers einen Kühlmittelaustritt Das Befestigungsmittel kann auch eine Niet, eine Klemme, eine Umbördelung, ein umlaufender Reifen oder ähnliches sein.In a generally preferred embodiment, the housing is provided with an exit-side end region via a fastening means, in particular a screw, at least one of the two, exit-side bottom piece or outlet diffuser set. Overall, this improves the mechanical fixing of the housing and prevents a coolant outlet even with a long service life of the exhaust gas cooler. The fastening means can also be a rivet, a clamp, a bead, a revolving tire or the like.

In einer weiteren Variante eines erfindungsgemäßen Abgaskühlers hat das Gehäuse an einem austrittsseitigen Endbereich eine formschlüssige Struktur, insbesondere eine Verjüngung, wobei der Austrittsdiffusor formschlüssig gegen die Struktur abgestützt ist. Besonders bevorzugt ist dabei zwischen der formschlüssigen Struktur und dem Austrittsdiffusor eine dritte Dichtung angeordnet. Dies ermöglicht eine besonders einfache und schnelle Montage des Abgaskühlers.In a further variant of an exhaust gas cooler according to the invention, the housing has a form-fitting structure, in particular a taper, at an exit-side end region, wherein the outlet diffuser is positively supported against the structure. Particularly preferably, a third seal is arranged between the positive-locking structure and the outlet diffuser. This allows a particularly simple and quick installation of the exhaust gas cooler.

In einer alternativen oder ergänzenden Ausführungsform ist an dem Austrittsdiffusor ein Haftenlittel angeordnet, wobei das Haltemittel mit einem austrittsseitigen Endbereich des Gehäuses verbunden ist. In einer vorteilhaften Realisierung umfasst das Haltemittel dabei zumindest ein federelastisches Blech, wobei das Blech in einem elastisch vorgespannten Zustand an dem Endbereich des Gehäuses festgelegt ist. Hierdurch ist eine Halterung des austrittsseitigen Gehäusebereichs ermöglicht, die zugleich eine Kompensation der thermischen Ausdehnung der verschiedenen Komponenten erlaubt. Weiterhin alternativ oder ergänzend ist das Haltemittel über den Austrittsdiffusor schiebbar und von dem Austrittsdiffusor formschlüssig gehalten. Ein solches Haltemittel ist in der Montage einfach und hinsichtlich des Ausgleichs von ausdehnungsbedingtem Spiel zweckmäßig.In an alternative or additional embodiment, a sticking agent is arranged on the outlet diffuser, wherein the holding means is connected to an outlet-side end region of the housing. In an advantageous implementation, the holding means comprises at least one resilient sheet metal, wherein the sheet is fixed in an elastically biased state at the end portion of the housing. As a result, a holder of the outlet-side housing portion is made possible, which also allows compensation for the thermal expansion of the various components. Further alternatively or additionally, the holding means is slidable over the outlet diffuser and held in a form-fitting manner by the outlet diffuser. Such a holding means is simple in assembly and in terms of compensation of expansion-related game appropriate.

Allgemein bevorzugt besteht das Gehäuse zumindest teilweise aus einem Kunststoff aus der Gruppe Polyamid (PA). Polyphtalamid (PPA) und Polyphenylensutfid (PPS). Diese Kunststoffe sind mechanisch stabil und bis zu Temperaturen von wenigstens etwa 160 °C temperaturbeständig.Generally, the housing is at least partially made of a plastic from the group polyamide (PA). Polyphtalamide (PPA) and polyphenylene selenide (PPS). These plastics are mechanically stable and temperature resistant up to temperatures of at least about 160 ° C.

In einer weiteren Ausführungsform der Erfindung kann der Kühler in ein Aluminium-Guss-Modul oder -Gehäuse eingeschoben sein, welches beispielsweise an einem Motor befestigt, wie vorzugsweise verschraubt wird. Durch dieses Gehäuse oder Modul wird eine einfache Übergabe des Kühlmittels realisierbar und das Gehäuse oder Modul kann vorzugsweise Verschaubungspunkte als Befestigungspunkte zur Verbindung mit dem Motor aufweisen.In a further embodiment of the invention, the cooler may be inserted into an aluminum casting module or housing, which for example attached to a motor, as is preferably bolted. Through this housing or module, a simple transfer of the coolant can be realized and the housing or module can preferably Verschaubungspunkte as attachment points for connection to the engine.

Eine bevorzugte Ausführungsform zeichnet sich dadurch aus, dass an dem Austrittsdiffusor ein Haltemittel angeordnet ist, wobei das Haltemittel mit einem austrittsseitigen Endbereich des Gehäuses verbindbar ist, wobei bevorzugt das Haltemittel zumindest ein federelastisches Blech umfasst, wobei das Blech in einem elastisch vorgespannten Zustand an dem Endbereich des Gehäuses festgelegt ist, wobei besonders bevorzugt das Haltemittel über den Austrittsdiffusor schiebbar und von dem Austrittsdiffusor formschlüssig gehalten ist.A preferred embodiment is characterized in that a holding means is arranged on the outlet diffuser, wherein the holding means is connectable to an exit-side end portion of the housing, wherein preferably the holding means comprises at least one resilient sheet, wherein the sheet in an elastically biased state at the end portion of the housing is fixed, wherein particularly preferably the retaining means is slidable over the outlet diffuser and positively held by the outlet diffuser.

Eine weitere bevorzugte Ausführungsform zeichnet sich dadurch aus, dass das Gehäuse zumindest teilweise aus einem Kunststoff aus der Gruppe Polyamid (PA), Polyphtalamid (PPA) und Polyphenylensulfid (PPS) besteht.A further preferred embodiment is characterized in that the housing consists at least partially of a plastic from the group polyamide (PA), polyphthalamide (PPA) and polyphenylene sulfide (PPS).

Eine weitere bevorzugte Ausführungsform zeichnet sich dadurch aus, dass das Gehäuse Teil eines gesamten Moduls oder gesamten Gehäuses ist, das an einen Motor direkt oder indirekt befestigbar ist, wie insbesondere mit dem Motor verschraubbar ist.A further preferred embodiment is characterized in that the housing is part of an entire module or entire housing, which is directly or indirectly fastened to a motor, in particular as can be screwed to the motor.

Weitere Vorteile und Merkmale eines erfindungsgemäßen Abgaskühlers ergeben sich aus den nachfolgend beschriebenen Ausführungsbeispielen sowie aus den abhängigen Ansprüchen.Further advantages and features of an exhaust gas cooler according to the invention will become apparent from the embodiments described below and from the dependent claims.

Nachfolgend werden sechs bevorzugte Ausführungsbeispiele eines Abgaskühlers beschrieben und anhand der anliegenden Zeichnungen näher erläutert.

Fig. 1
zeigt eine schematische Schnittansicht eines ersten Ausführungsbeispiels eines Abgaskühlers.
Fig. 2
zeigt eine schematische Schnittansicht eines zweiten Ausführungsbeispiels eines Abgaskühlers.
Fig. 3
zeigt eine schematische Schnittansicht eines dritten Ausführungsbeispiels eines Abgaskühlers.
Fig. 4
zeigt eine schematische Schnittansicht eines vierten Ausführungsbeispiels eines Abgaskühlers.
Fig. 5
zeigt eine schematische Schnittansicht eines fünften Ausführungsbeispiels eines Abgaskühlers.
Fig. 6
zeigt eine schematische Schnittansicht eines sechsten Ausführungsbeispiels eines Abgaskühlers.
Hereinafter, six preferred embodiments of an exhaust gas cooler will be described and explained in more detail with reference to the accompanying drawings.
Fig. 1
shows a schematic sectional view of a first embodiment of an exhaust gas cooler.
Fig. 2
shows a schematic sectional view of a second embodiment of an exhaust gas cooler.
Fig. 3
shows a schematic sectional view of a third embodiment of an exhaust gas cooler.
Fig. 4
shows a schematic sectional view of a fourth embodiment of an exhaust gas cooler.
Fig. 5
shows a schematic sectional view of a fifth embodiment of an exhaust gas cooler.
Fig. 6
shows a schematic sectional view of a sixth embodiment of an exhaust gas cooler.

Der Abgaskühler gemäß Fig. 1 umfasst einen hinsichtlich des Abgasstroms eintrittsseitigen Eintrittsdiffusor 1, der vorliegend ein an sich bekanntes Stellglied 2 zur selektiven Verteilung des Abgasstroms auf Tauscherrohre und/oder einen Bypasskanal. Das Stellglied 2 ist optional und findet vorwiegend bei Verbrennungsmotoren in Personenkraftwagen Anwendung.The exhaust gas cooler according to Fig. 1 includes an inlet with respect to the exhaust gas inlet inlet diffuser 1, which in the present case a known per se actuator 2 for the selective distribution of the exhaust gas flow to exchanger tubes and / or a bypass channel. The actuator 2 is optional and is mainly used in internal combustion engines in passenger cars.

Ein Bündel aus parallelen Tauscherrohren 3 ist an jedem der Enden der Tauscherrohre mit einem eintrittsseitigen Bodenstück 4 und entsprechend einem austrittsseitigen Bodenstück 5 verschweißt. Die Tauscherrohre 3 und die Bodenstücke 4, 5 bestehen jeweils aus einem nicht korrosionsanfälligen Stahl oder einem anderen zur Führung eines heißen Abgasstroms geeigneten Material. An dem austrittsseitigen Bodenstück 5 ist ein sich konisch verjüngender Austrittsdiffusor 6 angeschweißt.A bundle of parallel exchanger tubes 3 is welded at each of the ends of the exchanger tubes to an inlet-side bottom piece 4 and corresponding to an outlet-side bottom piece 5. The exchanger tubes 3 and the bottom pieces 4, 5 each consist of a non-susceptible steel or other suitable for guiding a hot exhaust gas stream material. At the outlet-side bottom piece 5, a conically tapered outlet diffuser 6 is welded.

Ein Gehäuse 7 des Abgaskühlers besteht aus einem Kunststoff und umgibt das Bündel von Tauscherrohren 3, wobei das Gehäuse 7 einerseits gegenüber dem eintrittsseitigen Bodenstück 4 und andererseits gegenüber dem austrittsseitigen Bodenstück 5 abgedichtet ist, so dass Gehäuse 7, Bodenstücke 4, 5 und die Tauscherohre insgesamt ein Volumen zur Führung eines Kühlmittels eingrenzen. Das Gehäuse 7 hat einen Eintritt 7a und einen Austritt 7b für das Kühlmittel, so dass das Gehäuse 7 von dem Kühlmittel, insbesondere dem Kühlmittel eines Hauptkühlkreislaufs eines Verbrennungsmotors des Kraftfahrzeugs, durchströmbar ist. Dabei stehen sowohl die Wände der Tauscherrohre 3 sowie die bezüglich des eingeschlossenen Volumens inneren Oberflächen der Bodenstücke 4, 5 mit dem Kühlmittel in unmittelbarem Kontakt.A housing 7 of the exhaust gas cooler consists of a plastic and surrounds the bundle of exchanger tubes 3, wherein the housing 7 is sealed on the one hand with respect to the inlet side bottom piece 4 and on the other hand with respect to the outlet side bottom piece 5 so that the housing 7, bottom pieces 4, 5 and the exchanger tubes in total delimiting a volume to guide a coolant. The housing 7 has an inlet 7a and an outlet 7b for the coolant, so that the housing 7 can be flowed through by the coolant, in particular the coolant of a main cooling circuit of an internal combustion engine of the motor vehicle. In this case, both the walls of the exchanger tubes 3 and with respect to the enclosed volume inner surfaces of the bottom pieces 4, 5 with the coolant in direct contact.

Bei dem Abgaskühler handelt es sich der Bauart nach um einen I-FlowKühler, bei dem die Tauscherrohre 3 im Wesentlichen gerade verlaufen und parallel zueinander angeordnet sind. Durch die Tauscherrohre 3 bzw. die Strömungsrichtung des Abgases durch die Rohre wird eine axiale Richtung des Abgaskühlers definiert.The exhaust gas cooler is of the type according to an I-flow cooler, in which the exchanger tubes 3 are substantially straight and are arranged parallel to one another. Through the exchanger tubes 3 and the flow direction of the exhaust gas through the tubes an axial direction of the exhaust gas cooler is defined.

Eintrittsseitig sind der Eintrittsdiffusor 1, das eintrittsseitige Bodenstück 4 und das Gehäuse 7 in axialer Richtung kraftbeaufschlagt mittels einer ersten Dichtung 8 und einer zweiten Dichtung 9 dichtend aneinander festgelegt. Dabei weist das eintrittsseitige Bodenstück 4 eine radiale Abkragung 4a auf, auf der abgasseitig die erste Dichtung 8 und kühlmittelseitig die zweite Dichtung 9 aufgelegt ist. Hierzu können die Abkragung 4a sowie die Dichtungen 8, 9 Rillen, Sicken, Schneiden oder andere an sich bekannte Mittel zur Positionierung und Abdichtung aufweisen. Auf die erste Dichtung 8 ist der Eintrittsdiffusor 1 mit einer an ihm vorgesehenen Abkragung 1 a aufgesetzt. Auf die zweite Dichtung 9 ist das Gehäuse 7 mittels einer an ihm ausgeformten Abkragung 7c aufgesetzt. Die Abkragungen 1 a, 4a, 7c weisen sich überdeckende Durchbrechungen bzw. Bohrungen auf, die von als Schrauben mit Muttern ausgebildeten Befestigungsmitteln 10 durchgriffen werden. Über den Umfang verteilt sind mehrere Schrauben 10 zur sicheren Festlegung vorgesehen. Bei dem Befestigungsmittel kann es sich auch um eine Niet, eine Klammer oder ein anderes geeignetes Mittel handeln.On the inlet side of the inlet diffuser 1, the inlet side bottom piece 4 and the housing 7 in the axial direction kraftbeaufschlagt by means of a first seal 8 and a second seal 9 sealingly fixed to each other. In this case, the inlet-side bottom piece 4 has a radial Abkragung 4a, on the exhaust side, the first seal 8 and the coolant side, the second seal 9 is placed. For this purpose, the Abkragung 4a and the seals 8, 9 have grooves, beads, cutting or other known means for positioning and sealing. On the first seal 8 of the entrance diffuser 1 is placed with a provided on it Abkragung 1 a. On the second seal 9, the housing 7 is attached by means of a formed on it Abkragung 7c. The Abkragungen 1 a, 4 a, 7 c have overlapping perforations or holes that are penetrated by trained as screws with nuts fasteners 10. Distributed over the circumference several screws 10 are provided for secure fixing. The fastener may also be a rivet, staple or other suitable means.

Im vorliegenden Ausführungsbeispiel ist in die Durchbrechungen zudem eine nicht dargestellte Hülse eingesetzt, die die Durchbrechung des Kragens des Gehäuses 7c durchgreift und auf dem Kragen des Bodenstücks 4a aufliegt. Bei der ersten Dichtung 8 handelt es sich um eine Metalldichtung, z. B. aus Kupfer oder einem anderen hinsichtlich der eintrittsseitigen Temperatur des Abgases temperaturfesten Metall. Bei der zweiten Dichtung 9 handelt es sich um eine Silikondichtung, die bis zu einer Temperatur von etwa 200 °C temperaturfest ist. Bedingt durch die nicht dargestellte Hülse führt ein Anziehen der Schraube 10 mittels einer Mutter und ggf. vorgesehener Unterlegscheiben zu einer summarischen Kompression von Gehäusekragen 7c und zweiter Dichtung 9 um einen durch das Hülsenmaß definierten Hub, so dass die weichen Materialien von Gehäuse und zweiter Dichtung 9 nicht überbelastet werden. Die Metalldichtung 8 ist dagegen mit einer höheren Kraft anpressbar, die durch das Anzugsmoment der Schraube gegeben ist. Insgesamt erfolgt die Abdichtung von Eintrittsdiffusor 1, Bodenstück 4 und eintrittsseitigem Ende des Gehäuses 7 somit in axialer Richtung.In the present embodiment, a sleeve, not shown, is also inserted into the openings, which passes through the opening of the collar of the housing 7c and rests on the collar of the bottom piece 4a. The first seal 8 is a metal gasket, for. Example of copper or another temperature-resistant metal with respect to the inlet temperature of the exhaust gas. The second seal 9 is a silicone gasket which is temperature resistant up to a temperature of about 200 ° C. Due to the sleeve, not shown, tightening the screw 10 by means of a nut and possibly provided washers to a summary compression of the housing collar 7c and second seal 9 by a stroke defined by the sleeve dimension, so that the soft materials of the housing and the second seal 9 are not overloaded. The metal seal 8, however, can be pressed with a higher force, which is given by the tightening torque of the screw. Overall, the sealing of inlet diffuser 1, bottom piece 4 and inlet end of the housing 7 thus takes place in the axial direction.

Eine austrittsseitige Abdichtung des Gehäuses 7 gegenüber dem zweiten Bodenstück 5 erfolgt über eine dritte Dichtung 11, die als O-Ring auf einer sich in axialer Richtung erstreckenden Abkragung 5a des austrittsseitigen Bodenstücks 5 aufliegt. Die dritte Dichtung 11 ist gehäuseseitig in einer Ringnut 7d des Gehäuses eingelegt.An outlet-side sealing of the housing 7 with respect to the second bottom piece 5 via a third seal 11, which rests as an O-ring on an extending in the axial direction Abkragung 5 a of the outlet side bottom piece 5. The third seal 11 is inserted on the housing side in an annular groove 7d of the housing.

Eine in Austrittsrichtung hinter der Dichtung 11 angeordnete umlaufende Nase 7e des Gehäuses rastet in eine entsprechende Nut oder Rille 5b des Bodenstücks 5 ein, um eine eventuelle Schwingung der Teile des Abgaskühlers zueinander zu verringern.A circumferential nose 7e of the housing arranged in the exit direction behind the seal 11 snaps into a corresponding groove or groove 5b of the bottom piece 5 in order to reduce any possible vibration of the parts of the exhaust gas cooler relative to one another.

Das Gehäuse 7 weist über seine gesamte Länge einen freien Durchtrittsquerschnitt auf, wobei das Bodenstück 5 mit seiner Abkragung 5a und der Austrittsdiffusor 6 mit diesem freien Querschnitt nicht kollidieren. Bei der Montage wird zunächst insbesondere durch Schweißung oder Lötung eine vorgefertigte Einheit aus Austrittsdiffusor 6, Bodenstück 5 mit Abkragung 5a, Tauscherrohren 3 und eintrittsseitigem Bodenstück 4 mit Abkragung 4a hergestellt, welche nachfolgend in das Kunststoffgehäuse 7 eingeschoben werden, wobei zuvor die zweite Dichtung 9 platziert wird. Das Einschieben erfolgt mit dem Austrittsdiffusor voran in die eintrittsseitige Öffnung des Gehäuses 7, also gemäß Fig. 1 durch eine Bewegung der vorgefertigten Einheit von links nach rechts. Nach diesem Einschieben wird die erste Dichtung 8 auf dem ersten Bodenstück 4 platziert, der Eintrittsdiffusor 1 aufgesetzt und die Schrauben 10 mit den Hülsen eingesetzt und angezogen. Somit ist zur Montage des Gehäuses 7 kein Fertigungsschritt erforderlich, der einen Wärmeeintrag in das Gehäuse 7 bewirken kann, insbesondere keine Verlötung oder Verschweißung.The housing 7 has over its entire length a free passage cross-section, wherein the bottom piece 5 does not collide with its Abkragung 5a and the outlet diffuser 6 with this free cross-section. During assembly, in particular by welding or soldering a prefabricated unit from outlet diffuser 6, bottom piece 5 with Abkragung 5a, Tauscherrohren 3 and eintrittsseitigem bottom piece 4 with Abkragung 4a produced, which are subsequently inserted into the plastic housing 7, wherein previously placed the second seal 9 becomes. The insertion takes place with the outlet diffuser first in the inlet-side opening of the housing 7, ie according to Fig. 1 by a movement of the prefabricated unit from left to right. After this insertion, the first seal 8 is placed on the first bottom piece 4, the inlet diffuser 1 is placed and the screws 10 are inserted and tightened with the sleeves. Thus, no manufacturing step is required for mounting the housing 7, which can cause heat input into the housing 7, in particular no soldering or welding.

Die radiale Abdichtung des Kragens 5a des Bodenstücks 5 gegenüber dem Gehäuse 7 mittels der dritten Dichtung 11 ermöglicht zudem eine Kompensation einer thermischen Ausdehnung der Tauscherrohre 3 gegenüber dem Gehäuse 7. Hierbei kann die Dichtung 11, die in der Nut 7d in axialer Richtung gegenüber dem Gehäuse 7 fixiert ist, auf dem Kragen 5a des Bodenstücks 5 gleiten. Es kann auch vorgesehen sein, dass die Dichtung 11 gegenüber dem Kragen 5a fixiert ist und gegenüber dem Gehäuse 7 gleitet oder gegenüber beiden Elementen gleitet.The radial sealing of the collar 5a of the bottom piece 5 relative to the housing 7 by means of the third seal 11 also allows compensation of thermal expansion of the exchanger tubes 3 relative to the housing 7. Here, the seal 11, in the groove 7d in the axial direction relative to the housing 7 is fixed, slide on the collar 5 a of the bottom piece 5. It can also be provided that the seal 11 is fixed relative to the collar 5a and slides relative to the housing 7 or slides with respect to both elements.

Bei dem zweiten Ausführungsbeispiel gemäß Fig. 2 liegt im Unterschied zu dem ersten Ausführungsbeispiel eine zusätzliche Festlegung des austrittsseitigen Endbereichs des Gehäuses 7 an dem Kragen 5a des Bodenstücks 5 vor, damit auch bei Materialermüdung oder hohem Kühlmitteldruck keine Undichtigkeit des Kühlmittels in diesem Bereich auftritt. In der vorliegenden schematischen Darstellung sind Schrauben 12 in radialer Richtung in den Kragen 5a eingeschraubt, wobei sie das Gehäuse 7 durchgreifen. Die Schrauben 12 sind austrittsseitig der dritten Dichtung 11 angeordnet. Falls die Materialstärke des Kragen 5a nur Durchgangsgewinde zulässt, können die Schrauben über weitere Dichtmittel abgedichtet werden, wie etwa eine Gewindedichtung.In the second embodiment according to Fig. 2 is in contrast to the first embodiment, an additional determination of the exit-side end portion of the housing 7 on the collar 5 a of the bottom piece 5, so that no leakage of coolant occurs in this area even with material fatigue or high coolant pressure. In the present schematic illustration screws 12 are screwed in the radial direction in the collar 5 a, wherein they pass through the housing 7. The screws 12 are arranged on the outlet side of the third seal 11. If the material thickness of the collar 5a allows only through threads, the screws can be sealed by other sealing means, such as a thread seal.

Bei der Ausführung gemäß dem dritten Ausführungsbeispiel (siehe Fig. 3) ist der austrittsseitige Endbereich des Gehäuses 7 ähnlich wie im zweiten Ausführungsbeispiel mittels Schrauben 12 gesichert, wobei die Schrauben 12 in Muttern 13 eingeschraubt sind, die auf einem konischen Wandungsabschnitt 6a des Austrittsdiffusors 6 festgelegt sind, insbesondere mittels Schweißung. Je nach Materialstärke des Austrittsdiffusors 6 kann es sich auch um Sackgewinde in der Wandung 6a handeln. Eine Ausführung wie in Fig. 3 ist zum Beispiel dann vorteilhaft, wenn die Materialstärken beispielsweise des Bodenstücks 5 nicht ausreichend sind, um Schraubgewinde vorzusehen.In the embodiment according to the third embodiment (see Fig. 3 ), the exit-side end portion of the housing 7 is similar to the second embodiment secured by screws 12, the screws 12 are screwed into nuts 13 which are fixed on a conical wall portion 6a of the outlet diffuser 6, in particular by welding. Depending on the material thickness of the outlet diffuser 6, it may also be blind thread in the wall 6a. An execution as in Fig. 3 For example, it is advantageous if the material thicknesses of, for example, the bottom piece 5 are not sufficient to provide screw thread.

Bei dem vierten Ausführungsbeispiel gemäß Fig. 4 hat das Gehäuse 7 im Unterschied zum ersten Ausführungsbeispiel eine formschlüssige Struktur an seinem austrittsseitigen Endbereich, welche vorliegend als Verjüngung 14 des Gehäuses 7 ausgeformt ist. Die Verjüngung 14 korrespondiert mit einem konischen Abschnitt 6a der Wandung des Austrittsdiffusors 6. Zwischen der Verjüngung 14 und der Wandung 6a ist eine Dichtung 11a in eine Gehäusenut eingetegt Die Dichtung 11a kann alternativ oder ergänzend zu der dritten Dichtung 11 des ersten Ausführungsbeispiels vorgesehen werden. Grundsätzlich hat das Abgas austrittsseitig eine erheblich niedrigere Temperatur als eintrittsseitig. Typische Temperaturwerte für das eintrittsseitige Abgas sind 600 °C bis 700 °C, wogegen das austrittsseitige Abgas Temperaturen von typisch 150 °C bis 160 °C aufweist. Die Erwärmung des Austrittsdiffusors 6 ist daher begrenzt, so dass das Gehäuse 7 und eine elastische, ggf. aus Silikon bestehende Dichtung 11a an der Wandung 6a anliegen können, ohne zerstört zu werden. Besonders unkritisch ist das Prinzip des vierten Ausführungsbeispiels in dem Fall, in dem das Gehäuse 7 aus Aluminium besteht.In the fourth embodiment according to Fig. 4 has the housing 7, in contrast to the first embodiment, a positive-locking structure at its outlet end portion, which in the present case as a taper 14th of the housing 7 is formed. The taper 14 corresponds to a conical portion 6a of the wall of the outlet diffuser 6. Between the taper 14 and the wall 6a, a gasket 11a is inserted into a housing groove. The gasket 11a may be provided alternatively or in addition to the third gasket 11 of the first embodiment. Basically, the exhaust gas outlet side has a significantly lower temperature than the inlet side. Typical temperature values for the inlet-side exhaust gas are 600 ° C to 700 ° C, whereas the outlet-side exhaust gas has temperatures of typically 150 ° C to 160 ° C. The heating of the outlet diffuser 6 is therefore limited, so that the housing 7 and an elastic, possibly made of silicone seal 11a may rest against the wall 6a, without being destroyed. Particularly uncritical is the principle of the fourth embodiment in the case in which the housing 7 is made of aluminum.

Alternativ kann die Dichtung 11a auch auf dem dem Anschlussflansch benachbarten zylindrischen Segment des Austrittsdiffusors angeordnet sein, so dass dann das Gehäuse dann weiter nach hinten bis näher an den Anschlussflansch heran reicht und einen Bereich des zylindrischen Segments umgibt. Dadurch können thermische Dehnungen des Kühlerblocks weiter kompensierbar sein.Alternatively, the seal 11a may also be arranged on the adjacent flange of the cylindrical segment of the outlet diffuser, so that then the housing then further down to nearer to the connection flange extends and surrounds a portion of the cylindrical segment. As a result, thermal expansions of the radiator block can be further compensated.

Bei dem fünften Ausführungsbeispiel (siehe Fig. 5) erfolgt die austrittsseitige Abdichtung des Gehäuses 7 ebenso wie im ersten Ausführungsbeispiel mittels einer Ringdichtung 11, die auf einem Kragen 5a des Bodenstücks 5 aufliegt. Im Unterschied zu dem ersten Ausführungsbeispiel hat das Gehäuse 7 auch austrittsseitig eine radiale Abkragung 15, an der mittels Schrauben 16 federelastische Bleche 17 festgelegt sind, die am Umfang einer Wandung 6a des Austrittsdiffusors 6 befestigt sind. Die elastischen Bleche 17 können grundsätzlich nach einem Einschieben der Baueinheit in das Gehäuse 7 an der Wandung 6a angeschweißt werden, da diese weit von dem Gehäuse 7 entfernt ist. Bevorzugt sind die Bleche 17 jedoch wie durch die gepunkteten Linien dargestellt vor dem Einschieben der Einheit in das Gehäuse 7 an der Wandung 6a festgelegt und so umgebogen, dass sie zunächst den freien Querschnitt des Gehäuses 7 nicht überdecken. Erst nach dem Einschieben der baulichen Einheit in das Gehäuse 7 werden sie gemäß der Pfeile in Fig. 5 federelastisch verbogen und mittels der Schrauben 16 an dem Kragen 15 befestigt. Hierdurch ist das Gehäuse 7 im austrittsseitigen Endbereich sicher gegenüber dem Austrittsdiffusor 6 und dem Bodenstück 5 gehalten, wobei aufgrund der Federelastizität der Bleche 17 weiterhin eine gute Ausgleichsfähigkeit thermischer Ausdehnungen besteht.In the fifth embodiment (see Fig. 5 ), the outlet-side sealing of the housing 7 as well as in the first embodiment by means of a ring seal 11, which rests on a collar 5 a of the bottom piece 5. In contrast to the first embodiment, the housing 7 and the outlet side has a radial Abkragung 15 on which by means of screws 16 resilient plates 17 are fixed, which are fixed to the circumference of a wall 6a of the outlet diffuser 6. The elastic sheets 17 can in principle be welded into the housing 7 on the wall 6a after the assembly has been pushed in, since the latter is far away from the housing 7. Preferably, however, the sheets 17 are fixed as shown by the dotted lines before inserting the unit into the housing 7 on the wall 6a and bent so that they first free Do not cover the cross-section of the housing 7. Only after inserting the structural unit into the housing 7, they are in accordance with the arrows in Fig. 5 bent elastically and fastened by means of screws 16 on the collar 15. As a result, the housing 7 is securely held in the exit-side end region with respect to the outlet diffuser 6 and the bottom piece 5, wherein due to the spring elasticity of the sheets 17 there is still a good compensating thermal expansion.

Das sechste Ausführungsbeispiel gemäß Fig. 6 ist in seiner Konstruktion dem fünften Ausführungsbeispiel ähnlich, wobei anstelle der federelastischen Bleche nunmehr ein Haltemittel 18 über den Austrittsdiffusor 6 geschoben und mit der Abkragung 15 des Gehäuses 7 verschraubt wird. Das Haltemittel 18 ist als rotationssymmetrischer Trichter ausgebildet, der mit seiner kleineren Öffnung umlaufend auf einer konischen Wandung 6a des Austrittsdiffusors 6 aufliegt. Auch hierdurch ist eine elastich nachgiebige Halterung des austrittsseitigen Endbereichs des Gehäuses 7 gegenüber dem Bodenstück 5 und dem Austrittsdiffusor 6 ermöglicht.The sixth embodiment according to Fig. 6 is similar in its construction to the fifth embodiment, instead of the resilient plates now a holding means 18 is pushed over the outlet diffuser 6 and bolted to the Abkragung 15 of the housing 7. The holding means 18 is formed as a rotationally symmetrical funnel, which rests with its smaller opening circumferentially on a conical wall 6a of the outlet diffuser 6. This also makes it possible to mount the outlet-side end region of the housing 7 in an elastically flexible manner relative to the bottom piece 5 and the outlet diffuser 6.

Es versteht sich, dass die besonderen Merkmale der verschiedenen Ausführungsbeispiele je nach Anforderungen sinnvoll miteinander kombiniert werden können.It is understood that the special features of the various embodiments can be meaningfully combined with each other depending on the requirements.

Claims (15)

  1. An exhaust gas cooler, in particular for a motor vehicle, comprising
    an inlet diffuser (1) for supplying an exhaust gas flow,
    an exchanger area having a plurality of exchanger tubes (3) extending in an axial direction, wherein the exchanger tubes (3) are received on one end on a first, inlet-side bottom part (4) and on their other end on a second outlet-side bottom part (5),
    an outlet diffuser (6) opposite said inlet diffuser (1) for discharging the exhaust gas flow, and
    a housing (7) adapted to be flown through by a coolant, wherein said housing (7) is made of a material which is not resistant to high temperatures, in particular plastic or aluminium,
    characterised in that
    a first seal (8) is arranged between the inlet diffuser (1) and the first bottom part (4) for sealing the exhaust gas against the outside, and a second seal (9) is arranged between the first bottom part (4) and the housing (7) for sealing the coolant against the outside.
  2. The exhaust gas cooler as claimed in claim 1, characterised in that said first bottom part (4), said second bottom part (5) and said exchanger tubes (3) form a pre-assembled, in particular welded, unit which is slidably insertable into said housing (7) in the axial direction.
  3. The exhaust gas cooler as claimed in claim 2, characterised in that said pre-assembled unit further comprises the outlet diffuser (6).
  4. The exhaust gas cooler as claimed in any one of the preceding claims, characterised in that the inlet diffuser (1) is held in a substantially axial direction relative to the housing (7) by at least one fastening means (10), in particular a bolt, wherein said first and second seals (8, 9) are subjected to force by the holding means.
  5. The exhaust gas cooler as claimed in claim 4, characterised in that the fastening means (10) is partly guided within a sleeve extending through a collar (7c) of the housing.
  6. The exhaust gas cooler as claimed in any one of the preceding claims, characterised in that said first seal (8) is a high-temperature resistant seal, in particular made of metal.
  7. The exhaust gas cooler as claimed in any one of the preceding claims, characterised in that said second seal (9) has a temperature resistance of up to at least about 200°C, wherein said second seal is, in particular, made of silicone.
  8. The exhaust gas cooler as claimed in any one of the preceding claims, characterised in that a third seal (11) is provided between the housing (7) and at least one of the outlet-side bottom part (5) and the outlet diffuser (6).
  9. The exhaust gas cooler as claimed in claim 8, characterised in that said third seal (11) is subjected to a force substantially perpendicular relative to the axial direction.
  10. The exhaust gas cooler as claimed in claim 8 or 9, characterised in that said third seal (11) is slidably received in the axial direction such that thermal expansion of the exhaust gas cooler is compensatable.
  11. The exhaust gas cooler as claimed in any one of the preceding claims, characterised in that the outletside bottom part (5) has a bevel (5a) substantially extending in the axial direction.
  12. The exhaust gas cooler as claimed in any one of the preceding claims, characterised in that an outletside end section of said housing (7) is fixed to at least one of the outlet-side bottom part (5) and the outlet diffuser (6) by a fastening means (12), in particular a bolt.
  13. The exhaust gas cooler as claimed in any one of the preceding claims, characterised in that an outletside end section of said housing (7) has a form-fit structure, in particular a taper, wherein the outlet diffuser (6) is supported against said structure in a form-fit manner.
  14. The exhaust gas cooler as claimed in claim 13, characterised in that a third seal (11a) is present or arranged between said form-fit structure and the outlet diffuser (6).
  15. The exhaust gas cooler as claimed in claim 14, characterised in that said seal (11a) is arranged on the conical and/or cylindrical segment of the outlet diffuser.
EP07765061.2A 2006-07-06 2007-07-05 Exhaust gas cooler, in particular for a motor vehicle Not-in-force EP2041419B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006031611 2006-07-06
PCT/EP2007/005938 WO2008003486A1 (en) 2006-07-06 2007-07-05 Exhaust gas cooler, in particular for a motor vehicle

Publications (2)

Publication Number Publication Date
EP2041419A1 EP2041419A1 (en) 2009-04-01
EP2041419B1 true EP2041419B1 (en) 2016-09-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07765061.2A Not-in-force EP2041419B1 (en) 2006-07-06 2007-07-05 Exhaust gas cooler, in particular for a motor vehicle

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EP (1) EP2041419B1 (en)
DE (1) DE102007031419A1 (en)
WO (1) WO2008003486A1 (en)

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DE102009035674A1 (en) 2009-07-30 2011-02-03 Behr Gmbh & Co. Kg Heat exchanger, heat exchanger system
DE102009050884A1 (en) * 2009-10-27 2011-04-28 Behr Gmbh & Co. Kg Exhaust gas heat exchanger
DE102010005803A1 (en) * 2010-01-27 2011-07-28 Audi Ag, 85057 Car with an exhaust system
CN103270383B (en) * 2010-09-30 2015-09-30 赫多特普索化工设备公司 Waste heat boiler
PL2482020T5 (en) 2011-01-31 2023-03-27 Haldor Topsøe A/S Heat exchanger
DE102011113788A1 (en) * 2011-09-20 2013-03-21 Friedrich Boysen Gmbh & Co. Kg Heat transfer assembly
DE102012211311A1 (en) * 2012-06-29 2014-01-02 Behr Gmbh & Co. Kg Exhaust gas heat exchanger
DE102012214221A1 (en) * 2012-08-09 2014-03-06 Behr Gmbh & Co. Kg Heat exchanger
SE536960C2 (en) * 2012-12-20 2014-11-11 Scania Cv Ab Heat exchanger with bypass ducts
CN105121990B (en) * 2013-04-11 2018-01-12 巴斯夫欧洲公司 Tube bundle devices and its use
DE102014006761A1 (en) 2013-06-21 2014-12-24 Modine Manufacturing Company exhaust gas cooler
DE102013221932A1 (en) 2013-10-29 2015-04-30 MAHLE Behr GmbH & Co. KG Heat exchanger and method for producing a heat exchanger
CN109791033A (en) * 2016-09-26 2019-05-21 马勒国际有限公司 Heat exchanger
DE102017210400A1 (en) 2017-06-21 2018-12-27 Mahle International Gmbh Heat exchanger
DE112018008099T5 (en) * 2018-10-23 2021-12-23 MAHLE Behr India Private Ltd. Exhaust gas cooler arrangement

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US1335506A (en) * 1917-07-16 1920-03-30 Griscom Russell Co Oil-cooler
JP2000088477A (en) * 1998-09-14 2000-03-31 Calsonic Corp Apparatus for cooling egr gas
FR2792968B1 (en) * 1999-04-29 2001-06-29 Westaflex Automobile PLASTIC AND STEEL HEAT EXCHANGER FOR ARRANGEMENT IN AN AIR INTAKE CIRCUIT OF AN ENGINE, PARTICULARLY IN A DISTRIBUTOR COMPRISING TWO CHAMBERS AND ELEMENT OF THE AIR INTAKE CIRCUIT OF AN ENGINE
EP1277945B1 (en) * 2001-07-18 2006-09-13 Cooper-Standard Automotive (Deutschland) GmbH Cooler of an EGR system and EGR system with such a cooler
ES2209618B1 (en) * 2002-05-28 2005-08-16 Estampaciones Noroeste, S.A. HEAT EXCHANGER FOR AN "EGR" SYSTEM WITH AN INTEGRATED DERIVATION CONDUCT.
DE20316688U1 (en) * 2003-10-29 2004-03-11 Behr Gmbh & Co. Kg heat exchangers

Also Published As

Publication number Publication date
EP2041419A1 (en) 2009-04-01
WO2008003486A1 (en) 2008-01-10
DE102007031419A1 (en) 2008-01-10

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