EP1249587B1 - Abgaskrümmer für einen Motor - Google Patents

Abgaskrümmer für einen Motor Download PDF

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Publication number
EP1249587B1
EP1249587B1 EP20020290847 EP02290847A EP1249587B1 EP 1249587 B1 EP1249587 B1 EP 1249587B1 EP 20020290847 EP20020290847 EP 20020290847 EP 02290847 A EP02290847 A EP 02290847A EP 1249587 B1 EP1249587 B1 EP 1249587B1
Authority
EP
European Patent Office
Prior art keywords
flange
exhaust manifold
section
notch
manifold
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.)
Expired - Lifetime
Application number
EP20020290847
Other languages
English (en)
French (fr)
Other versions
EP1249587A1 (de
Inventor
Thierry Huillet
Michel Serandour
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP1249587A1 publication Critical patent/EP1249587A1/de
Application granted granted Critical
Publication of EP1249587B1 publication Critical patent/EP1249587B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • the present invention relates to a combustion gas exhaust device of an internal combustion engine, including a motor vehicle. It concerns more precisely the exhaust manifold, which is the part of the exhaust system attached to the cylinder head of the engine and intended to collect the exhaust gases leaving the different ducts of the cylinder head to transport them, at the outlet of the manifold, in a single conduit.
  • Figure 1 a molded exhaust manifold, as known from the state of the art.
  • This manifold comprises a main tube 1, one end has a flange 4 for connecting the exhaust system located downstream.
  • a plurality of ducts 2, intended to communicate respectively with each exhaust duct of the cylinder head, are connected to the main tube 1.
  • the ducts 2 are held on the cylinder head by a clamping system formed of a flange 3 intended to be fixed on the engine cylinder head by screws, directly screwed into threaded holes of the cylinder head, or by studs, implanted in the cylinder head, and nuts screwed on said studs.
  • a seal is interposed between the flange 3 and the cylinder head.
  • the space available in the engine compartment of a car requires to make parts of the exhaust system in a form increasingly compact.
  • the counterbores 5 for supporting the screw heads or nuts have a flat half-ring.
  • This particular embodiment is intended to simultaneously ensure the clamping of the exhaust manifold flange and intake manifold flange, which fit into one another, each screw or nut simultaneously bearing on a 5 of the exhaust manifold and on a counter 6 of the intake manifold, placed vis-a-vis, as shown in dashed lines on the left side of the drawing.
  • the sawing performed after the planing of the seal face can release internal stresses originally existing in the room in the case of collectors cast iron or cast steel, or resulting from the assembly of its constituent elements in the case of a mechanically welded construction.
  • the release of these internal constraints can lead to the original flatness of the said bearing face is destroyed after sawing, or that the fixing centers are modified.
  • the flatness of said support face is necessary to avoid leakage problems between the cylinder head and collector, and the precise spacing of the fixing points is required to avoid creating genes during factory assembly.
  • the present invention aims to solve these problems and aims in particular to provide an exhaust manifold with minimal risk of cracking, and without burdening the cost.
  • the invention relates to an exhaust manifold for an internal combustion engine, comprising a flange for securing the manifold to the cylinder head of the engine, characterized in that the flange has a continuity of material along its length and comprises at least one predetermined location area which has a substantial weakening, also predetermined value, relative to the other parts of the flange.
  • This area of lower resistance relative to the surrounding areas of the flange is determined so as to ensure a rigid connection between the different parts of the flange, but to break naturally during the first minutes or first hours of operation of the engine, under the effect of the thermal and vibratory stresses generated by the operation.
  • the break is thus somehow guided, and located precisely at the desired location, predetermined to ensure the best conditions of subsequent differential expansions, that is to say to allow the collector to expand and accept vibratory stresses in current operation of the engine, without risk of uncontrolled cracking in areas where it would be unacceptable for the reliability of the collector.
  • the collector flange remains an integral part element, ensuring the geometry required for optimum flatness of the support face of the flange and for the correct positioning of the manifold on the breech when fixing.
  • said weakening is obtained by a reduction of the section of the flange, it itself preferably obtained by a transverse notch leaving a section of material with a tensile strength of resistance within a predetermined range.
  • the breaking strength of the material remaining at the notch must of course be less than that of the neighboring zones, so that the desired break is achieved well at the desired location and not elsewhere in an uncontrolled manner. It must also be greater than a predetermined minimum threshold, so that the rupture can not occur before fixing the collector on the cylinder head.
  • the resistance of the weakened zone must be sufficient to withstand, without breaking the stresses generated during manufacturing operations or machining of the collector.
  • the notch is formed on the side of the bearing face of the collector.
  • the situation of the notch on this side of the flange is particularly favorable to facilitate breakage, especially when the notch is made at a fastener, the tightening locally causes a bending effect of the flange, clean to open the notch.
  • the notch has a "V" section, the bottom of which accordingly has a relatively sharp edge, constituting a clear incipient fracture for the desired break.
  • the section reduction is obtained during the molding of the collector.
  • the section reduction can be carried out, for example in the form of a simple fracture primer, by a specific tool adapted, such as a blade or punch cut performed at the end of the finishing or deburring operation. of the part after demolding.
  • the manifold according to the invention shown in Figures 1 and 2 comprises a main tube 1 on which are connected four ducts 2.
  • the flange 3 for fixing the manifold on the cylinder head, not shown, of an internal combustion engine comprises four clamping elements 31, made in one-piece casting with the conduits 2 and the main tube 1.
  • Each clamping element comprises, in a conventional manner, a communication orifice with a respective conduit 2.
  • the flange 3 is formed by cutting a thick plate, on which the ducts 2 are then welded.
  • the fixing of the collector on the cylinder head is ensured conventionally by studs and nuts, or by screws.
  • the flange 3 has several holes 32 or notches 33 of semi-cylindrical shape for the passage of the rods of said studs or screws.
  • the notches 33 of half-cylindrical shape are intended to cooperate with similar notches, made on an intake manifold and located in correspondence during the assembly of said collectors to form cylindrical holes together.
  • a counterbore 5 is made for service surface support at the head of the screw or the fixing nut.
  • a notch 37 is formed in the flange at the notch 33 located towards the middle thereof.
  • This notch formed during the molding, opens on the side of the support face 35 of the flange and a section of general shape in "V", as can be seen in FIG. 3.
  • the section of material 38 remaining at this point is substantially reduced, and especially as the notch is formed just at the notch of the screw passage and corresponding counterbore. This gives the attenuation according to the invention, conducive to breaking during the subsequent operation of the motor, as indicated above.
  • the invention is not limited to the embodiment which has just been described.
  • other similar cuts could be made on the flange, at other holes or notches, or at other points in the flange that are suitable for developing a break that could reduce thermal or vibration stresses in the other parts. of the collector.
  • the shape and orientation of the notch could also be modified, depending on the specific shapes of the collectors.

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

Claims (7)

  1. Auspuffkrümmer für einen Verbrennungsmotor, aufweisend einen Flansch (3), welcher zum Sicherstellen der Befestigung des Krümmers am Zylinderkopf des Motors bestimmt ist,
    wobei der Flansch eine Kontinuität im Material über seine Länge aufweist und mindestens eine vorherbestimmte Lokalisierungszone (38) umfasst, die eine deutliche Schwächung von einem ebenfalls vorherbestimmten Wert im Verhältnis zu den anderen Teilen des Flansches aufweist,
    dadurch gekennzeichnet, dass die Querschnittsverringerung durch einen transversalen Einschnitt (37) erhalten ist, welcher einen Materialquerschnitt (38) bestehen lässt, der eine Widerstandsfähigkeit gegenüber Zugbruch innerhalb einer vorherbestimmten Spanne bietet.
  2. Auspuffkrümmer nach Anspruch 1, dadurch gekennzeichnet, dass die Schwächung (38) durch eine lokalisierte Verringerung des Querschnitts des Flansches erhalten ist.
  3. Auspuffkrümmer nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Einschnitt (37) auf der Seite der Anlagefläche (35) des Krümmers vorgesehen ist.
  4. Auspuffkrümmer nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass der Einschnitt (37) einen "V-förmigen" Querschnitt aufweist.
  5. Auspuffkrümmer nach einem der Ansprüche 1, 4, dadurch gekennzeichnet, dass die Schwächung (38) in einer Zone (33) realisiert ist, die zum Aufnehmen von Befestigungsmitteln des Krümmers an dem Zylinderkopf vorgesehen ist.
  6. Auspuffkrümmer nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass die Querschnittsverringerung während dem Gießen des Krümmers erhalten wird.
  7. Auspuffkrümmer nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass die Querschnittsverringerung durch ein angepasstes Werkzeug während den Operationen des Gussputzens des Teils nach der Entformung realisiert ist.
EP20020290847 2001-04-09 2002-04-05 Abgaskrümmer für einen Motor Expired - Lifetime EP1249587B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0104756 2001-04-09
FR0104756A FR2823255B1 (fr) 2001-04-09 2001-04-09 Collecteur d'echappement pour moteur

Publications (2)

Publication Number Publication Date
EP1249587A1 EP1249587A1 (de) 2002-10-16
EP1249587B1 true EP1249587B1 (de) 2006-03-08

Family

ID=8862071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020290847 Expired - Lifetime EP1249587B1 (de) 2001-04-09 2002-04-05 Abgaskrümmer für einen Motor

Country Status (4)

Country Link
EP (1) EP1249587B1 (de)
DE (1) DE60209667T2 (de)
ES (1) ES2254620T3 (de)
FR (1) FR2823255B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2990469B1 (fr) * 2012-05-10 2015-09-04 Faurecia Sys Echappement Raccord de collecteur d'echappement avec zone de rupture de bride

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4796426A (en) * 1982-07-06 1989-01-10 Feuling James J High efficiency transition element positioned intermediate multi-cylinder exhaust system and secondary pipe assemblies
DE19917604C5 (de) * 1998-04-20 2009-09-10 Honda Giken Kogyo K.K. Wärmeisolierter Abgaskrümmer
JP2000199427A (ja) * 1998-12-28 2000-07-18 Hitachi Metals Ltd タ―ボチャ―ジャ用タ―ビンハウジングを鋳造一体化した排気マニホ―ルド

Also Published As

Publication number Publication date
FR2823255B1 (fr) 2003-07-04
FR2823255A1 (fr) 2002-10-11
ES2254620T3 (es) 2006-06-16
DE60209667T2 (de) 2006-12-14
DE60209667D1 (de) 2006-05-04
EP1249587A1 (de) 2002-10-16

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