EP0327848B1 - Intake air conduit for an internal-combustion engine - Google Patents

Intake air conduit for an internal-combustion engine Download PDF

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Publication number
EP0327848B1
EP0327848B1 EP89100841A EP89100841A EP0327848B1 EP 0327848 B1 EP0327848 B1 EP 0327848B1 EP 89100841 A EP89100841 A EP 89100841A EP 89100841 A EP89100841 A EP 89100841A EP 0327848 B1 EP0327848 B1 EP 0327848B1
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EP
European Patent Office
Prior art keywords
conduit
main
intake air
air conduit
portions
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
EP89100841A
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German (de)
French (fr)
Other versions
EP0327848A3 (en
EP0327848A2 (en
Inventor
Jürgen Wahnschaffe
Lothar Bauer
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.)
Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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Publication of EP0327848A2 publication Critical patent/EP0327848A2/en
Publication of EP0327848A3 publication Critical patent/EP0327848A3/en
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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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10118—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements with variable cross-sections of intake ducts along their length; Venturis; Diffusers
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10098—Straight ducts
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1034—Manufacturing and assembling intake systems
    • F02M35/10347—Moulding, casting or the like

Definitions

  • the invention relates to an air intake pipe for an internal combustion engine according to the preamble of claim 1.
  • EP-A-0 251 180 discloses an air intake pipe for internal combustion engines, consisting of a largely cylindrical main pipe and the same and rectified intake pipe connections branching from it to the individual cylinders of the internal combustion engine, the intake pipe connections being attachable to the cylinder head of the internal combustion engine by means of at least one flange.
  • This generic air intake pipe consists of many individual parts and therefore requires a high manufacturing effort.
  • the invention has for its object to provide an air intake pipe that can be easily mass-produced.
  • the main tube is open on both ends so that after the one-piece production of the main tube together with the intake manifold socket in the die-casting process, the die-casting cores (slides) can be easily pulled out of the main tube.
  • the intake manifold is largely straight, so that a further die-casting core keeping the interior of the intake manifold clear can be easily pulled.
  • the main tube is preferably divided into two skin tube sections of approximately the same length, so that die cast cores of approximately the same shape result.
  • the main tube widens slightly conically towards its ends.
  • the main tube is designed as a flattened cylinder, the flattening being provided in the area of the intake manifold.
  • the main pipe can be tightly fixed to air filter housings or the like via fastening flanges arranged on the end faces, which are preferably supported on the main pipe by means of stiffening ribs.
  • circumferential ribs on the main pipe, which preferably extend only in the area of the circular curvature. If at least one longitudinal rib, which is advantageously firmly connected to the transverse ribs, extends from one fastening flange to the other over the entire axial length of the main tube, a stiffening rib bond results.
  • the cavities provided in the mold for the stiffening framework advantageously serve as feed channels for the die-casting material.
  • the air intake pipe 1 shown is provided for a four-cylinder internal combustion engine and consists of a main pipe 1 with open end faces 2, 3 and four intake pipe connections 4 which adjoin the main pipe 1 at the same distance from one another.
  • the main pipe 1 is essentially divided into two identical sections 5, 6, which are designed in cross section as flattened cylinders. Starting from the middle butt edge 7, the main pipe sections 5 and 6 widen slightly conically to their open end faces 2 and 3, wherein they pass into a full circular cross section in the region of the end faces 2 and 3.
  • a three-point fastening flange 8 which is essentially designed as a square, is arranged on each end face, as can also be seen in particular from FIG. 3.
  • the mounting flange 8 is further supported on the main pipe 1 along the stiffening ribs 9.
  • the fastening flange has three screw holes 10 with which it can be screwed tightly to an air filter housing or the like.
  • the main pipe also has circumferential circumferential ribs 11 which, as can be seen in FIG. 2, extend essentially over the part-circular jacket of the main pipe 1.
  • At least one longitudinal rib 12 is preferably also provided, which extends over the entire length of the main pipe 1 from a fastening flange 8 on one end face 2 to the other fastening flange 8 on the other end face 3, the composite of transverse ribs 11 and longitudinal ribs 12 stiff main tube 1 results, which is also resistant to vibrations.
  • the intake manifolds 4 enter the main pipe 1 at the flat 13, their inlet opening extending over the entire width of the flat 13; in the longitudinal direction of the main pipe 1, the inlet opening is narrower than its height measured in the transverse direction to the main pipe 1. As shown in particular in FIG. 1, the flattened portion 13 or the wall of the main pipe 1 forms a sharp edge 15 with the wall 14 of the intake pipe socket 4.
  • the air intake pipe designed according to the invention has the advantage that it can be produced by the die casting process.
  • a die-cast core In an outer shape, the division plane in Fig. 2 as Line AA is drawn in, a die-cast core is retracted in each case in the direction of the longitudinal axis 16 of the main tube 1 until these lie firmly against one another at their mutually facing end faces at the level of the abutting edge 7 and thus determine the inner shape of the main tube 1.
  • further die-casting cores are moved, which determine the inner shape of the intake manifold socket.
  • These further die-cast cores are in contact with the flats of the die-cast cores that determine the main pipe run 1.
  • the material is injected under high pressure - preferably via the cavity forming the longitudinal channel 12 and the circumferential channels forming the later transverse ribs 11 - and fills the cavity between the outer mold and the die-casting cores.
  • the cores can be pulled out due to the special design of the air intake pipe.
  • the air intake pipe After opening the mold in the division plane AA, the air intake pipe, which is produced in one piece by the die casting process, can be removed.
  • the mounting flange 8 is advantageously designed so that it can serve as a wall part of an exhaust air box 20 attached to the internal combustion engine.
  • the substantially rectangular basic shape of the flange 8 with a cut corner is advantageous.
  • the longer wall part of the intake manifold 14 opens approximately at a right angle into the flattened portion 13, the merging wall section 14a forming an obtuse angle 21 with the longer wall section 14b.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Duct Arrangements (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Known intake air conduits for internal combustion engines are designed as sand castings or chill castings; sand casting and chill casting, however, very time-consuming and both material-intensive and cost-intensive. With the design of the intake air conduit according to the invention this can now be manufactured as a pressure diecast part making material and time-saving mass production possible. Manufacture of intake air conduits for internal combustion engines. <IMAGE>

Description

Die Erfindung betrifft ein Luftansaugrohr für eine Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to an air intake pipe for an internal combustion engine according to the preamble of claim 1.

Die EP-A-0 251 180 offenbart ein Luftansaugrohr für Brennkraftmaschinen, bestehend aus einem weitgehend zylindrischen Hauptrohr und von diesem zu den einzelnen Zylindern der Brennkraftmaschine abzweigenden, gleichen und gleichgerichteten Saugrohrstutzen, wobei die Saugrohrstutzen mittels zumindest eines Flansches am Zylinderkopf der Brennkraftmaschine befestigbar sind. Dieses gattungsgemäße Luftansaugrohr besteht aus vielen Einzelteilen und erfordert deshalb einen hohen Fertigungsaufwand.EP-A-0 251 180 discloses an air intake pipe for internal combustion engines, consisting of a largely cylindrical main pipe and the same and rectified intake pipe connections branching from it to the individual cylinders of the internal combustion engine, the intake pipe connections being attachable to the cylinder head of the internal combustion engine by means of at least one flange. This generic air intake pipe consists of many individual parts and therefore requires a high manufacturing effort.

In der DE-A-31 17 768 ist ein Luftansaugrohr für Brennkraftmaschinen beschrieben, das einteilig in Druckguß ausgeführt ist. Die Druckgußform ist jedoch kompliziert und daher teuer in Herstellung und Betrieb.In DE-A-31 17 768 an air intake pipe for internal combustion engines is described, which is made in one piece in die casting. However, the die casting mold is complicated and therefore expensive to manufacture and operate.

Bekannte Luftansaugrohre für Brennkraftmaschinen sind derart ausgebildet, daß sie als Sandgußteil oder Kokillengußteil hergestellt werden können. Diese Herstellungsverfahren sind sehr material-, zeit- und kostenaufwendig.Known air intake pipes for internal combustion engines are designed in such a way that they can be produced as sand castings or chill castings. These manufacturing processes are very expensive in terms of materials, time and costs.

Der Erfindung liegt die Aufgabe zugrunde, ein Luftansaugrohr anzugeben, das in Massenfertigung einfach hergestellt werden kann.The invention has for its object to provide an air intake pipe that can be easily mass-produced.

Diese Aufgabe wird nach dem kennzeichnenden Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the characterizing features of claim 1.

Das Hauptrohr ist an seinen beiden Stirnseiten offen, so daß nach der einteiligen Herstellung des Hauptrohrs zusammen mit den Saugrohrstutzen im Druckgußverfahren die Druckgußkerne (Schieber) aus dem Hauptrohr leicht herausgezogen werden können. Ebenso sind die Saugrohrstutzen weitgehend gradlinig ausgeführt, so daß ein den Innenraum des Saugrohrstutzens freihaltender weiterer Druckgußkern leicht gezogen werden kann.The main tube is open on both ends so that after the one-piece production of the main tube together with the intake manifold socket in the die-casting process, the die-casting cores (slides) can be easily pulled out of the main tube. Likewise, the intake manifold is largely straight, so that a further die-casting core keeping the interior of the intake manifold clear can be easily pulled.

Vorzugsweise ist das Hauptrohr in zwei Hautprohrabschnitte etwa gleicher Länge aufgeteilt, so daß sich etwa gleich ausgebildete Druckgußkerne ergeben.The main tube is preferably divided into two skin tube sections of approximately the same length, so that die cast cores of approximately the same shape result.

Um ein einfaches Ziehen der Druckgußkerne zu ermöglichen, erweitert sich das Hauptrohr zu seinen Enden hin leicht konisch.In order to make it easy to pull the die-casting cores, the main tube widens slightly conically towards its ends.

Um eine Zugangsmöglichkeit zu den Saugrohrstutzenflanschen bzw. deren Befestigungsschrauben zu erzielen, die am Zylinderkopf festgeschraubt werden, ist das Hauptrohr als abgeflachter Zylinder ausgebildet, wobei die Abflachung im Bereich der Saugrohrstutzen vorgesehen ist.In order to provide access to the intake manifold flange or its fastening screws, which are screwed onto the cylinder head, the main tube is designed as a flattened cylinder, the flattening being provided in the area of the intake manifold.

Über an den Stirnseiten angeordnete Befestigungsflansche, die vorzugsweise mittels Versteifungsrippen am Hauptrohr abgestützt sind, ist das Hauptrohr an Luftfiltergehäusen o. dgl. dicht festlegbar.The main pipe can be tightly fixed to air filter housings or the like via fastening flanges arranged on the end faces, which are preferably supported on the main pipe by means of stiffening ribs.

Zur Erzielung einer niedrigen Geräuschemission ist vorgesehen, am Hauptrohr umlaufende Querrippen anzuordnen, die sich vorzugsweise nur im Bereich der Kreiskrümmung erstrecken. Ist mindestens eine über die ganze axiale Länge des Hauptrohrs sich von einem Befestigungsflansch zum anderen erstreckende Längsrippe vorgesehen, die vorteilhaft mit den Querrippen fest verbunden ist, so ergibt sich ein versteifender Rippenverbund.To achieve a low noise emission, it is provided to arrange circumferential ribs on the main pipe, which preferably extend only in the area of the circular curvature. If at least one longitudinal rib, which is advantageously firmly connected to the transverse ribs, extends from one fastening flange to the other over the entire axial length of the main tube, a stiffening rib bond results.

Die in der Form vorgesehenen Hohlräume für das Versteifungsgerippe dienen vorteilhaft als Zuführungskanäle für das Druckgußmaterial.The cavities provided in the mold for the stiffening framework advantageously serve as feed channels for the die-casting material.

Weitere Merkmale der Erfindung ergeben sich aus den weiteren Ansprüchen, der Beschreibung und der Zeichnung, in der ein Ausführungsbeispiel der Erfindung dargestellt ist.Further features of the invention result from the further claims, the description and the drawing, in which an embodiment of the invention is shown.

Es zeigen:

Fig. 1:
einen Axialschnitt durch ein Ausführungsbeispiel eines Luftansaugrohrs einer vierzylindrigen Brennkraftmaschine,
Fig. 2:
einen Schnitt längs der Linie II-II durch das Luftansaugrohr,
Fig. 3:
einen Schnitt längs der Linie III-III durch das Luftansaugrohr.
Show it:
Fig. 1:
3 shows an axial section through an exemplary embodiment of an air intake pipe of a four-cylinder internal combustion engine,
Fig. 2:
a section along the line II-II through the air intake pipe,
Fig. 3:
a section along the line III-III through the air intake pipe.

Das dargestellte Luftansaugrohr 1 ist für eine vierzylindrige Brennkraftmaschine vorgesehen und besteht aus einem Hauptrohr 1 mit offenen Stirnseiten 2, 3 und vier mit gleichem Abstand voneinander am Hauptrohr 1 quer anschließende Saugrohrstutzen 4.The air intake pipe 1 shown is provided for a four-cylinder internal combustion engine and consists of a main pipe 1 with open end faces 2, 3 and four intake pipe connections 4 which adjoin the main pipe 1 at the same distance from one another.

Das Hauptrohr 1 ist im wesentlichen in zwei gleiche Abschnitte 5, 6 unterteilt, die im Querschnitt als abgeflachte Zylinder ausgebildet sind. Von der mittleren Stoßkante 7 ausgehend, erweitern sich die Hauptrohrabschnitte 5 und 6 zu ihren offenen Stirnsteiten 2 und 3 leicht konisch, wobei sie im Bereich der Stirnseiten 2 und 3 in einen vollen Kreisquerschnitt übertreten.The main pipe 1 is essentially divided into two identical sections 5, 6, which are designed in cross section as flattened cylinders. Starting from the middle butt edge 7, the main pipe sections 5 and 6 widen slightly conically to their open end faces 2 and 3, wherein they pass into a full circular cross section in the region of the end faces 2 and 3.

An jeder Stirnseite ist - wie insbesondere auch aus Fig. 3 zu ersehen - ein Dreipunkt-Befestigungsflansch 8 angeordnet, der im wesentlichen als Viereck ausgebildet ist.A three-point fastening flange 8, which is essentially designed as a square, is arranged on each end face, as can also be seen in particular from FIG. 3.

Vorzugsweise ist zur Materialeinsparung eine der Ecken unter Bildung einer zur Diagonalen etwa parallelen Schnittkante abgeschnitten. Der Befestigungsflansch 8 ist ferner über längs zum Hauptrohr 1 verlaufende Versteifungsrippen 9 an diesem abgestützt. Der Befestigungsflansch weist drei Schraublöcher 10 auf, mit der dieser dichtend an einem Luftfiltergehäuse o. dgl. festgeschraubt werden kann.To save material, one of the corners is preferably cut off to form a cutting edge approximately parallel to the diagonal. The mounting flange 8 is further supported on the main pipe 1 along the stiffening ribs 9. The fastening flange has three screw holes 10 with which it can be screwed tightly to an air filter housing or the like.

Das Hauptrohr hat ferner über den Umfang verteilt umlaufende Querrippen 11, die - wie aus Fig. 2 zu ersehen - sich im wesentlichen über den teilkreisförmigen Mantel des Hauptrohrs 1 erstrecken. Vorzugsweise ist auch mindestens eine Längsrippe 12 vorgesehen, die sich über die ganze Länge des Hauptrohrs 1 von einem Befestigungsflansch 8 auf der einen Stirnseite 2 bis zum anderen Befestigungsflansch 8 auf der anderen Stirnseite 3 erstreckt, wobei der Verbund aus Querrippen 11 und aus Längsrippen 12 ein steifes Hauptrohr 1 ergibt, das auch gegen Schwingungen widerstandsfähig ist.The main pipe also has circumferential circumferential ribs 11 which, as can be seen in FIG. 2, extend essentially over the part-circular jacket of the main pipe 1. At least one longitudinal rib 12 is preferably also provided, which extends over the entire length of the main pipe 1 from a fastening flange 8 on one end face 2 to the other fastening flange 8 on the other end face 3, the composite of transverse ribs 11 and longitudinal ribs 12 stiff main tube 1 results, which is also resistant to vibrations.

Die Saugrohrstutzen 4 treten an der Abflachung 13 in das Hauptrohr 1 ein, wobei sich ihre Eintrittsöffnung über die ganze Breite der Abflachung 13 erstreckt; in Längsrichtung des Hauptrohrs 1 ist die Eintrittsöffnung schmaler als ihre in Querrichtung zum Hauptrohr 1 gemessene Höhe. Wie insbesondere in Fig. 1 dargestellt, bildet die Abflachung 13 bzw. die Wandung des Hauptrohrs 1 mit der Wandung 14 des Saugrohrstutzens 4 eine scharfe Kante 15.The intake manifolds 4 enter the main pipe 1 at the flat 13, their inlet opening extending over the entire width of the flat 13; in the longitudinal direction of the main pipe 1, the inlet opening is narrower than its height measured in the transverse direction to the main pipe 1. As shown in particular in FIG. 1, the flattened portion 13 or the wall of the main pipe 1 forms a sharp edge 15 with the wall 14 of the intake pipe socket 4.

Das erfindungsgemäß ausgebildete Luftansaugrohr hat den Vorteil, daß man es im Druckgußverfahren herstellen kann. In einer Außenform, dessen Teilungsebene in Fig. 2 als Linie A-A eingezeichnet ist, werden in Richtung der Längsachse 16 des Hauptrohrs 1 je ein Druckgußkern eingefahren, bis diese an ihren einander zugewandten Stirnseiten in Höhe der Stoßkante 7 fest aneinanderliegen und so die Innenform des Hauptrohrs 1 bestimmen. An diese eingefahrenen Druckgußkerne werden weitere Druckgußkerne herangefahren, die die Saugrohrstutzeninnenform bestimmen. Diese weiteren Druckgußkerne liegen an den Abflachungen der den Hauptrohrstrang 1 bestimmenden Druckgußkerne an. Nunmehr wird - vorzugsweise über den den Längskanal 12 bildenden Hohlraum und die mit diesem verbundenen, die späteren Querrippen 11 bildenden Umfangskanäle - das Material unter hohem Druck eingeschossen und füllt den Hohlraum zwischen der Außenform und den Druckgußkernen aus. Nach Erkalten des Druckgußmaterials können die Kerne aufgrund der besonderen Gestaltung des Luftansaugrohrs herausgezogen werden. Nach Öffnen der Form in der Teilungsebene A-A kann das einteilig im Druckgußverfahren hergestellte Luftansaugrohr entnommen werden.The air intake pipe designed according to the invention has the advantage that it can be produced by the die casting process. In an outer shape, the division plane in Fig. 2 as Line AA is drawn in, a die-cast core is retracted in each case in the direction of the longitudinal axis 16 of the main tube 1 until these lie firmly against one another at their mutually facing end faces at the level of the abutting edge 7 and thus determine the inner shape of the main tube 1. At these retracted die-casting cores, further die-casting cores are moved, which determine the inner shape of the intake manifold socket. These further die-cast cores are in contact with the flats of the die-cast cores that determine the main pipe run 1. Now, the material is injected under high pressure - preferably via the cavity forming the longitudinal channel 12 and the circumferential channels forming the later transverse ribs 11 - and fills the cavity between the outer mold and the die-casting cores. After the die-casting material has cooled, the cores can be pulled out due to the special design of the air intake pipe. After opening the mold in the division plane AA, the air intake pipe, which is produced in one piece by the die casting process, can be removed.

Der Befestigungsflansch 8 ist vorteilhaft so ausgebildet, daß er als Wandteil eines an der Brennkraftmaschine angesetzten Abluftkastens 20 dienen kann. Hierzu ist die im wesentlichen rechteckige Grundform des Flansches 8 mit einer geschnittenen Ecke vorteilhaft.The mounting flange 8 is advantageously designed so that it can serve as a wall part of an exhaust air box 20 attached to the internal combustion engine. For this purpose, the substantially rectangular basic shape of the flange 8 with a cut corner is advantageous.

Vorteilhaft mündet das längere Wandteil des Saugrohrstutzens 14 etwa rechtwinklig in die Abflachung 13, wobei der einmündende Wandabschnitt 14a mit dem längeren Wandabschnitt 14b einen stumpfen Winkel 21 bildet. Dies hat den Vorteil, daß der den Innenraum des Saugrohrstutzens 4 bildende Druckgußkern keine Spitzen unter 90° aufweist, die beim Gießen hoch temperaturbelastet wären.Advantageously, the longer wall part of the intake manifold 14 opens approximately at a right angle into the flattened portion 13, the merging wall section 14a forming an obtuse angle 21 with the longer wall section 14b. This has the advantage that the die-casting core forming the interior of the intake manifold 4 does not have any peaks below 90 ° which would be subjected to high temperatures during casting.

Claims (9)

  1. An intake air conduit for an internal combustion engine, comprising a substantially cylindrical main conduit and similar short conduits branching from the main conduit and extending in the same direction to the individual cylinders, the short conduits having flanges for fastening them to the cylinder head of the internal combustion engine, characterised in that both ends (2, 3) of the main conduit (1) are open for introducing a casting core, the short conduits (4) are each made substantially straight for introducing another core into each one, and the main conduit (1) and the short conduits (4) are produced together by die casting.
  2. An intake air conduit according to claim 1, characterised in that the main conduit (1) is made up of two portions (5, 6) each of which is approximately half the length of the main conduit.
  3. An intake air conduit according to claim 2, characterised in that the open end faces (2, 3) of the main-conduit portions (5, 6) widen, preferably uniformly and conically.
  4. An intake air conduit according to any one of claims 1 to 3, characterised in that the main conduit is flattened around part of its circumference, at least in the region of the adjacent short conduits (4).
  5. An intake air conduit according to any one of claims 2 to 4, characterised in that the end faces (2, 3) of the main-conduit portions (5, 6) support a securing flange (8), preferably with three screw-holes, which abuts the main-conduit portions (5, 6) via reinforcing ribs (9) extending in the longitudinal direction of the main conduit (1).
  6. An intake air conduit according to any one of claims 2 to 5, characterised in that the main-conduit portions (5, 6) in the region of the end faces (2, 3) widen from the flat portions (5, 6) to a circular passage cross-section in the end faces (2, 3).
  7. An intake air conduit according to any one of claims 1 to 6, characterised in that the main conduit (1) has peripheral transverse ribs (11).
  8. An intake air conduit according to any one of claims 1 to 7, characterised in that the main conduit (1) has at least one longitudinal rib (12) extending along the entire axial length of the main conduit.
  9. An intake air conduit according to claims 7 and 8, characterised in that the transverse ribs (11) and the longitudinal rib (12) form a composite rib.
EP89100841A 1988-02-10 1989-01-19 Intake air conduit for an internal-combustion engine Expired - Lifetime EP0327848B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3804063A DE3804063A1 (en) 1988-02-10 1988-02-10 AIR INTAKE PIPE FOR AN INTERNAL COMBUSTION ENGINE
DE3804063 1988-02-10

Publications (3)

Publication Number Publication Date
EP0327848A2 EP0327848A2 (en) 1989-08-16
EP0327848A3 EP0327848A3 (en) 1990-05-02
EP0327848B1 true EP0327848B1 (en) 1994-07-13

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EP89100841A Expired - Lifetime EP0327848B1 (en) 1988-02-10 1989-01-19 Intake air conduit for an internal-combustion engine

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EP (1) EP0327848B1 (en)
AT (1) ATE108516T1 (en)
DE (2) DE3804063A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4111772A1 (en) * 1991-04-11 1992-10-15 Kloeckner Humboldt Deutz Ag INTAKE SYSTEM FOR A SELF-IGNITION COMBUSTION ENGINE
DE4129356A1 (en) * 1991-09-04 1993-03-11 Bayerische Motoren Werke Ag Compound-cast intake for IC engine - has collector housing, cover and fastening flanges, produced in gravity die-casting process.
DE60134224D1 (en) 2001-08-10 2008-07-10 Ford Global Tech Inc intake manifold

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3329961A1 (en) * 1983-08-19 1985-03-07 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Exhaust pipe system between a multi-cylinder internal combustion engine supercharged on the ram pressure principle and an exhaust turbocharger
EP0251180A2 (en) * 1986-06-25 1988-01-07 Showa Aluminum Corporation Intake manifold and process for producing same

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Publication number Priority date Publication date Assignee Title
FR2239900A5 (en) * 1973-08-03 1975-02-28 Bayerische Motoren Werke Ag
DE3117768A1 (en) * 1981-05-06 1983-03-10 Helmut 5067 Kürten Kohl Intake pipe for internal combustion engines and associated tools
DE3224168A1 (en) * 1982-06-29 1983-12-29 Alfred Teves Gmbh, 6000 Frankfurt DIE CASTING MOLD FOR A MAIN BRAKE CYLINDER HOUSING AND DIE CASTING MASTER CYLINDER HOUSING MADE WITH THIS CASTING MOLD
DE3463288D1 (en) * 1983-01-14 1987-05-27 Bayerische Motoren Werke Ag Cast air admission device for combustion engines, particularly pressure die-cast device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3329961A1 (en) * 1983-08-19 1985-03-07 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg Exhaust pipe system between a multi-cylinder internal combustion engine supercharged on the ram pressure principle and an exhaust turbocharger
EP0251180A2 (en) * 1986-06-25 1988-01-07 Showa Aluminum Corporation Intake manifold and process for producing same

Also Published As

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DE3804063A1 (en) 1989-08-24
DE58908021D1 (en) 1994-08-18
EP0327848A3 (en) 1990-05-02
ATE108516T1 (en) 1994-07-15
EP0327848A2 (en) 1989-08-16

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