EP0623739B1 - Rohrkrümmer - Google Patents

Rohrkrümmer Download PDF

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Publication number
EP0623739B1
EP0623739B1 EP94102305A EP94102305A EP0623739B1 EP 0623739 B1 EP0623739 B1 EP 0623739B1 EP 94102305 A EP94102305 A EP 94102305A EP 94102305 A EP94102305 A EP 94102305A EP 0623739 B1 EP0623739 B1 EP 0623739B1
Authority
EP
European Patent Office
Prior art keywords
tubular body
side flange
tubular
manifold
orifice
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
EP94102305A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0623739A1 (de
Inventor
Friedrich Eichler
Rüdiger Schüler
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of EP0623739A1 publication Critical patent/EP0623739A1/de
Application granted granted Critical
Publication of EP0623739B1 publication Critical patent/EP0623739B1/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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/053—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure characterised by the material of the blanks
    • B21D26/055—Blanks having super-plastic properties
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1883—Construction facilitating manufacture, assembly, or disassembly manufactured by hydroforming

Definitions

  • the invention relates to a pipe bend according to the preamble of patent claim 1.
  • a generic pipe elbow has become known from EP-0321869-A1 (F01N7 / 10). This shows an arcuate tubular body, which is produced from a cylindrical tube piece by a forming process, not described in detail. With its open ends, this tubular body is connected to the outlet openings of an internal combustion engine via flange bodies. A collection opening is provided on a side of the pipe jacket facing away from the engine, to which a pipe socket leading to an exhaust-side flange is welded. Compared to the pipe bends previously known in the prior art, this construction is particularly advantageous because the welds necessary for the assembly of the pipe bend have been moved to areas with little stress.
  • the invention has for its object to further optimize a generic elbow with regard to its fatigue strength.
  • the pipe bend is made in one piece by internal high-pressure forming together with pipe socket and has walls whose wall thicknesses to the respective flanges on the engine or. Increase exhaust side towards each.
  • the one-piece design of the tubular body means that welding processes are no longer required. This not only simplifies production, but also significantly increases the fatigue strength.
  • the hydroforming process also known as hydroforming, also allows highly reproducible fine tolerances and ensures high fatigue strength because there are no longitudinal stresses in the component itself and, depending on the process control, the material structure can be strengthened and a stiffening effect can be achieved. It should also be emphasized that wrinkle-free tubular bodies can be produced, in the walls of which the fiber course is undisturbed.
  • the increase in wall thickness towards the flanges means that more material is placed in the ends of the tubular body.
  • the wall thickness transitions on the flange are reduced, which is particularly important for heat management during welding.
  • thinner wall thicknesses in the middle regions of the tubular body also cause it to become more elastic and thus to better compensate for relative movements between the internal combustion engine and the exhaust system, which are generally subject to strong periodic fluctuations.
  • the central regions have an approximately elliptical cross section.
  • the smaller of the ellipse axes runs approximately perpendicular to the bending axis of the tubular body.
  • the circular ends allow use in flanges, the openings of which can be made by simple drilling operations.
  • a tulip plate is arranged between the molded pipe socket and the opening of the exhaust-side flange, which is frictionally connected to one of the aforementioned components and can thus compensate for relative movements generated by thermal stresses or mechanical fluctuations.
  • FIG. 1 a double pipe elbow 1, which here essentially has two pipe bodies 2, 3, which project with open ends 2.1, 2.2 or 3.1, 3.2 into openings 4 to 7 of a motor-side flange 8.
  • 3 molded pipe sockets 2.3 and 3.3 protrude into openings 9, 10 of an exhaust-side flange 11.
  • tulip sheets 12 and 13 which are attached to their edges at the edges by means of a weld seam (not shown) on the tubular bodies 2 and 3 and the pipe sockets 2.3 and 3.3 are held in a frictionally locking manner in the openings 9 and 10.
  • the open ends 2.1, 2.2 or 3.1, 3.2 are connected to the motor-side flange 8 by means of circumferential sealing welds on the end face of the pipe ends.
  • the construction of the double pipe elbow shown in FIG. 1 is essentially comparable to that of DE-29 35 926-A1 (F01N7 / 08). In the case of a four-cylinder in-line engine, this design is particularly expedient with an ignition sequence of 1, 3, 4, 2 or 1, 2, 4, 3 and also enables a space-saving design.
  • FIG. 3 shows another view of how the open ends 2.1, 2.2 or 3.1, 3.2 protrude into the openings 4 to 7 of the motor-side flange 8.
  • a cylindrical tube blank is pre-bent or pre-crimped and then annealed to remove the strain hardening.
  • a first forming process in which the pipe is given its final shape except for the pipe socket 9 or 10 leading to the exhaust-side flange.
  • material is pressed into the outer radius from the inside of the pipe body in the area of the molding point for the pipe socket.
  • a second annealing process then takes place.
  • the material flow is regulated in a tool 14 so that the tubular body 2 is not destroyed by increased friction in a critical area 15 on the tool edges.
  • an electronically controlled piston 16 which supports the pipe socket 2.3 when it is pressed out and periodically lifts it off from the edges and tool walls (see FIG. 4).
  • This allows material from a wide area to flow around the area to be reshaped. In this way, the wall thickness can also be varied at certain points. This is done by means of a corresponding pre-deformation of the tube blank, as a result of which the outer walls bear partially against the tool 14, so that the material flow is impeded there due to the friction that is then present.
  • material can flow in from thicker points via pistons by deliberately lifting the blank from the tool wall.
  • a pressure of up to 6000 bar is usually generated for the previously described forming processes via locking cylinders 17, 18.
  • Such a method allows for an initial wall thickness Use a 1.75 mm pipe to form an approximately 10 mm long socket from a semi-arched tubular body. With an increase in the outside diameter from originally 42 mm in the area of the engine-side flange 8 to 50 mm in the area of the exhaust-side flange 11, the wall thickness does not fall below 1.3 mm here.
  • austenitic materials with ferritic properties can be, for example, an X15CrNiSi 20 12, X2CrNiMo 17 13 3 or X2CrNiMoN 17 13 5. In the latter case, the ferrite content ensures good ductility. Austenite significantly reduces the tendency towards scaling and embrittlement, especially during and after welding processes.
  • pipe blanks with an elliptical cross-section enables a reduction of critical stresses in particularly vulnerable areas by approx. 40% with an axis ratio for the outside diameter of 32 mm to 55 mm compared to circular pipes with a comparable cross-sectional area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Exhaust Silencers (AREA)
EP94102305A 1993-05-03 1994-02-16 Rohrkrümmer Expired - Lifetime EP0623739B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4314470 1993-05-03
DE4314470 1993-05-03

Publications (2)

Publication Number Publication Date
EP0623739A1 EP0623739A1 (de) 1994-11-09
EP0623739B1 true EP0623739B1 (de) 1995-12-20

Family

ID=6486968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102305A Expired - Lifetime EP0623739B1 (de) 1993-05-03 1994-02-16 Rohrkrümmer

Country Status (3)

Country Link
EP (1) EP0623739B1 (es)
DE (1) DE59400065D1 (es)
ES (1) ES2081722T3 (es)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9407812U1 (de) * 1994-05-11 1994-07-21 Zeuna-Stärker GmbH & Co KG, 86154 Augsburg Rohrzusammenführung und Vorrichtung zu ihrer Herstellung
EP0733788B1 (de) 1995-02-24 2002-07-17 Volkswagen Aktiengesellschaft Rohrkrümmer für eine Brennkraftmaschine
DE19518252C2 (de) * 1995-05-18 1997-05-22 Schaefer Maschbau Wilhelm Verfahren und Vorrichtung zum Herstellen eines metallenen Hosenrohres nach dem Innenhochdruck-Umformverfahren
DE19546509A1 (de) * 1995-12-13 1997-06-19 Zeuna Staerker Kg Abgaskrümmer sowie Verfahren zu seiner Herstellung
DE19752773C2 (de) 1997-11-28 1999-09-02 Daimler Chrysler Ag Verfahren zur Herstellung eines luftspaltisolierten Abgaskrümmers einer Fahrzeugabgasanlage
DE19752772C2 (de) 1997-11-28 1999-09-02 Daimler Chrysler Ag Verfahren zur Herstellung eines mit einem Abzweigstutzen versehenen luftspaltisolierten Abgasrohres
DE19803275A1 (de) * 1998-01-29 1999-08-12 Benteler Werke Ag Abgaskrümmer
DE102007006254A1 (de) * 2007-02-08 2008-08-14 Daimler Ag Verfahren zur Herstellung eines Fahrwerk- und/oder Karosseriebauteils
EP1985388B1 (de) * 2008-08-06 2010-03-24 Witzenmann GmbH Hochdruckfester Metallbalg und Verfahren zum Herstellen eines solchen
GB2535001A (en) * 2015-12-22 2016-08-10 Daimler Ag Exhaust pipe element for an exhaust system of a vehicle, in particular a motor vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068206B (de) * 1955-06-17 1959-11-05 Flexonics Corporation, Maywood, 111. (V. St. A.) Verfahren zum Herstellen eines gekrümmten Rohrformstückes
FR2527263B1 (fr) * 1982-05-22 1985-06-21 Witzenmann Metallschlauchfab Collecteur d'echappement et procede pour sa fabrication
US4840053A (en) * 1987-07-29 1989-06-20 Mitsui & Co., Ltd. Method for manufacturing a pipe with projections
JPH0543227Y2 (es) * 1987-12-21 1993-10-29
DE4103083C1 (en) * 1991-02-01 1992-05-27 H.D. Eichelberg & Co Gmbh, 5750 Menden, De Steel pipe branch for IC engine exhaust - is formed by integral, hydrostatically shaped component with inner, longitudinal flanges

Also Published As

Publication number Publication date
ES2081722T3 (es) 1996-03-16
DE59400065D1 (de) 1996-02-01
EP0623739A1 (de) 1994-11-09

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