EP2169206A2 - Refroidisseur de gaz d'échappement de véhicule automobile - Google Patents

Refroidisseur de gaz d'échappement de véhicule automobile Download PDF

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Publication number
EP2169206A2
EP2169206A2 EP09169437A EP09169437A EP2169206A2 EP 2169206 A2 EP2169206 A2 EP 2169206A2 EP 09169437 A EP09169437 A EP 09169437A EP 09169437 A EP09169437 A EP 09169437A EP 2169206 A2 EP2169206 A2 EP 2169206A2
Authority
EP
European Patent Office
Prior art keywords
cassette
exhaust gas
gas cooler
support
vehicle exhaust
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.)
Withdrawn
Application number
EP09169437A
Other languages
German (de)
English (en)
Other versions
EP2169206A3 (fr
Inventor
Dr. Oliver Thomer
Peter Heuer
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
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 Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP2169206A2 publication Critical patent/EP2169206A2/fr
Publication of EP2169206A3 publication Critical patent/EP2169206A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a motor vehicle exhaust gas cooler with a jacket-cooled inner cassette for cooling exhaust gas of an internal combustion engine.
  • the inner cassette is usually made of two die-cast aluminum parts, namely a housing body enclosing substantially five sides and a cassette cover closing off the opening side of the housing body.
  • the edge region of the cassette lid and the edge region near the opening of the housing body are connected to one another in a liquid-tight and gastight manner by a circumferential radial weld seam.
  • the weld is arranged substantially radially, that is, it bridges the gap between the housing body and the cassette lid edge region substantially parallel to the base plane of the cassette lid.
  • the curvature shortens the effective length and width of the cassette lid, which in turn causes high tensile stresses on the weld. Since welds are sensitive to tensile stresses, they must be correspondingly deep, which is problematic and complex process, and from a certain weld depth is no longer readily possible. This applies in particular to automated welding processes, for example friction stir welding.
  • An object of the invention is to provide a vehicle exhaust gas cooler in which the manufacture of the connection and sealing between the cassette lid and the housing body is simplified.
  • the automotive exhaust gas cooler according to claim 1 has at the edge region of the cassette cover on the one hand and on the edge region of the housing body on the other hand proximally of the weld each have a circumferential support shoulder, wherein the two support shoulders are supported to each other such that radial tensile forces of the cassette lid from the support shoulders on the housing body be transmitted.
  • the radial tensile forces of the cassette lid that is, the tensile forces in the ground plane of the cassette lid, are transferred in large parts over the two support shoulders, and not over the weld.
  • the much more problematic radial tensile forces for the weld are absorbed by the radially acting support shoulders.
  • the weld can therefore be formed with correspondingly shallow depth, at the same time their fatigue strength is increased.
  • the support shoulders are wedge-shaped with respect to the joining axis, wherein the wedge angle of the support shoulders to the joining axis is particularly preferably less than 15 °.
  • the wedge angle of the support shoulders to the joining axis is particularly preferably less than 15 °.
  • the two support shoulders over the entire circumference at least linear, but preferably flat against each other.
  • the tensile forces are transmitted over a large area and evenly distributed over the circumference of the support shoulders.
  • the inner cassette is surrounded by a coolant housing. There is a distance of at least several millimeters between the coolant housing and the inner cassette. In the intermediate space formed thereby flows a liquid coolant, preferably cooling water, through which the inner cassette is cooled from the outside.
  • the housing body and the cassette lid are made of die-cast aluminum.
  • the automotive exhaust gas cooler has a jacket-cooled inner cassette and a coolant housing surrounding the inner cassette.
  • the inner cassette has a substantially five-sided enclosing housing body with an opening side which is closed by a cassette lid.
  • the edge region of the cassette lid and the opening near the edge region of the housing body are sealingly connected to each other by a circumferential weld.
  • at least one support point is provided, which is located proximal to the weld and through which the cassette lid is supported against convex bulging to the outside.
  • the support point should be as close as possible to the vertex of the convex curvature of the cassette lid, which would occupy the cassette lid in the absence of support and high cartridge internal pressure. Due to the additional support on the outside of the cassette lid, the curvature of the cassette lid is reduced to a minimum when exposed to overpressure on the inside. As a result, in turn, the reduction in the effective length and width of the cassette lid is also reduced to a minimum, so that the tensile forces introduced into the weld are considerably reduced. In particular, the voltage peaks are cut off.
  • the support point is formed inter alia of at least one support wedge, which jams the cassette lid against the coolant housing.
  • the coolant housing has a mounting opening into which the inner cassette is inserted during assembly of the exhaust gas cooler.
  • the support wedge is arranged such that when inserting the inner cassette into the coolant housing of the Support wedge in the end position of the inner cassette aufschiebt on a corresponding opposite support member.
  • the opposite support member may be formed as a reverse arranged, complementary support wedge. Due to the design as a support wedge tolerances in the distance of the cassette lid of the coolant housing can be compensated within certain limits so that a sufficient support of the cassette cover is always guaranteed.
  • the support point extends transversely to the mounting direction over at least half the width of the cassette lid.
  • the cassette lid is therefore supported not only at a single point, but over a certain width, which runs transversely to the mounting direction.
  • the support force is distributed on a line or on a surface.
  • a motor vehicle exhaust gas cooler 10 is shown in cross-section, which is arranged in a motor vehicle in the course of an exhaust gas recirculation and the cooling of the recirculated exhaust gas is used.
  • the exhaust gas cooler 10 has a coolant housing 12 and an inner cassette 14.
  • the coolant housing 12 and the inner cassette 14 are spaced several millimeters apart on all sides.
  • the cooling liquid space 16 formed between the inner cassette 14 and the coolant housing 12 is, for example, filled or flowed through with water.
  • the inner cassette 14 is thus jacket-cooled.
  • the inner cassette 14 consists essentially of a housing body enclosing substantially five sides and a cassette cover 20 terminating the opening side of the housing body.
  • the housing body and the cassette lid are each manufactured in one piece from die-cast aluminum.
  • the housing body 18 and the cassette lid 20 each have mutually offset and inwardly projecting cooling ribs 22,24.
  • the cassette lid 20 has in its edge region 26 a circumferential over the entire circumference support shoulder 28 which engages around a circumferential over the entire opening circumference support shoulder 30 in the near-edge edge portion 32 of the housing body 18 outside.
  • the cassette lid 20 is connected by a peripheral weld 34 with the housing body 18 liquid-tight and gas-tight mechanically.
  • a peripheral weld 34 is provided in the edge region 32 of the housing body 18 and in the edge region of the cassette cover 20 for this purpose.
  • Weld 34 is produced by friction stir welding but may be produced in other ways.
  • the two support shoulders 28,30 are each wedge-shaped, wherein the wedge angle a of the contact surfaces 40,42 of the support shoulders 28,30 to a joining axis 44 is approximately 10 °.
  • the support shoulders 28,30 are arranged proximal to the weld 34.
  • the cassette lid 20 sits with a certain bias in the joining axis 44 on the housing body 18.
  • the contact surfaces 40,42 of the two support shoulders 28,30 are over the entire surface and over the entire circumference radially biased each other. This ensures that caused by internal overpressure or by corresponding oscillations convex curvature of the cassette lid 20, and thereby causing the effective reduction of the width and length of the cassette lid 20, the thus generated radial tensile forces of the cassette lid 20 of the support shoulders 28,30 on the Housing body 18 are transmitted.
  • shear forces 34 substantially transmit thrust forces which hold the cassette lid 20 under bias in the housing body opening.
  • FIGS. 3 and 4 illustrated second embodiment shows a motor vehicle exhaust gas cooler 50, which in the construction of the Figures 1 and 2 essentially resembles.
  • the exhaust gas cooler 50 has a coolant housing 12 'and an inner cassette 14' which is essentially formed by a housing body 18 'and a cassette lid 20'.
  • the cassette lid 20 'and the housing body 18' are connected by a circumferential weld 34 'in the edge region together gas-tight and liquid-tight.
  • a cooling liquid space 16 ' is formed and a support point 52 is provided, through which the relaxed cassette lid 20' is supported distally outwardly against convex buckling.
  • the support point 52 is formed by two mutually complementary support wedges 54,56 with wedge surfaces 58,60, wherein a support wedge 54 on the coolant housing 12 'facing outside of the cassette lid 20' and the other support wedge 56 on the cassette lid 20 'facing inside of the coolant housing 12 'is provided. Both support wedges 54,56 extend over more than half the width of the cassette lid 20 '.
  • the inner cassette 14 ' When mounting the exhaust gas cooler 50, the inner cassette 14 'is inserted in a mounting direction 62 in the housing body 12'. In the in FIG. 3 shown end position of the inner cassette 14 'come the two wedge surfaces 58,60 to the plant. As a result, the cassette lid 20 'is biased slightly in the proximal direction and a significant buckling of the cassette lid 20' at overpressure within the inner cassette 14 'largely avoided. This also a significant reduction in the width and length of the cassette lid 20 'is avoided at inside overpressure. As a result, larger tensile forces in the circumferential weld 34 'are avoided. The weld 34 'transfers at internal overpressure substantially thrust forces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP09169437A 2008-09-26 2009-09-04 Refroidisseur de gaz d'échappement de véhicule automobile Withdrawn EP2169206A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008049253A DE102008049253B4 (de) 2008-09-26 2008-09-26 Kfz-Abgaskühler

Publications (2)

Publication Number Publication Date
EP2169206A2 true EP2169206A2 (fr) 2010-03-31
EP2169206A3 EP2169206A3 (fr) 2012-10-24

Family

ID=41395639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09169437A Withdrawn EP2169206A3 (fr) 2008-09-26 2009-09-04 Refroidisseur de gaz d'échappement de véhicule automobile

Country Status (2)

Country Link
EP (1) EP2169206A3 (fr)
DE (1) DE102008049253B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333473A3 (fr) * 2009-11-27 2011-10-12 Pierburg GmbH Dispositif de transmission de chaleur et agencement de produit semi-fini de transmission de chaleur ainsi que procédé destiné à la fabrication d'un tel dispositif de transmission de chaleur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010034765B4 (de) 2010-08-18 2012-05-24 Pierburg Gmbh KFZ-Abgaskühler
DE102011002053A1 (de) 2011-04-14 2012-10-18 Pierburg Gmbh Wärmetauscher für eine Verbrennungskraftmaschine sowie Verfahren zur Herstellung eines derartigen Wärmetauschers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006051000A1 (de) * 2005-10-26 2007-07-12 Behr Gmbh & Co. Kg Wärmetauscher, Verfahren zur Herstellung eines Wärmetauschers
DE102007041338B3 (de) * 2007-08-31 2008-12-11 Pierburg Gmbh Wärmeübertragungseinheit für eine Verbrennungskraftmaschine
DE102008012930B3 (de) * 2008-03-06 2009-06-04 Pierburg Gmbh Verfahren zur Herstellung von Wärmeübertragungsvorrichtungen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3207348A1 (de) * 1982-03-02 1983-09-15 Klöckner-Humboldt-Deutz AG, 5000 Köln Ober- bzw. unterkasten fuer waermetauscher
DE3223365A1 (de) * 1982-06-23 1983-12-29 Klöckner-Humboldt-Deutz AG, 5000 Köln Ober- bzw. unterkasten fuer waermetauscher
DE3738552A1 (de) * 1987-11-13 1989-05-24 Kloeckner Humboldt Deutz Ag Verfahren zur erhoehung der schwelldruckbelastbarkeit eines leichtmetallwaermetauschers
DE102004019554C5 (de) * 2004-04-22 2014-03-27 Pierburg Gmbh Abgasrückführsystem für eine Verbrennungskraftmaschine
DE102005058204B4 (de) * 2005-12-02 2008-07-24 Pierburg Gmbh Kühlvorrichtung für eine Verbrennungskraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006051000A1 (de) * 2005-10-26 2007-07-12 Behr Gmbh & Co. Kg Wärmetauscher, Verfahren zur Herstellung eines Wärmetauschers
DE102007041338B3 (de) * 2007-08-31 2008-12-11 Pierburg Gmbh Wärmeübertragungseinheit für eine Verbrennungskraftmaschine
DE102008012930B3 (de) * 2008-03-06 2009-06-04 Pierburg Gmbh Verfahren zur Herstellung von Wärmeübertragungsvorrichtungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2333473A3 (fr) * 2009-11-27 2011-10-12 Pierburg GmbH Dispositif de transmission de chaleur et agencement de produit semi-fini de transmission de chaleur ainsi que procédé destiné à la fabrication d'un tel dispositif de transmission de chaleur

Also Published As

Publication number Publication date
DE102008049253B4 (de) 2012-12-20
EP2169206A3 (fr) 2012-10-24
DE102008049253A1 (de) 2010-04-08

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