EP0576729B1 - Intake manifold for an internal combustion engine with one cylinder head - Google Patents

Intake manifold for an internal combustion engine with one cylinder head Download PDF

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Publication number
EP0576729B1
EP0576729B1 EP92121543A EP92121543A EP0576729B1 EP 0576729 B1 EP0576729 B1 EP 0576729B1 EP 92121543 A EP92121543 A EP 92121543A EP 92121543 A EP92121543 A EP 92121543A EP 0576729 B1 EP0576729 B1 EP 0576729B1
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EP
European Patent Office
Prior art keywords
intake
intake manifold
connection
cylinder head
manifold according
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
EP92121543A
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German (de)
French (fr)
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EP0576729A1 (en
Inventor
Klaus Döhring
Chris Andrews
Tom Boardman
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DOEHRING, KLAUS
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
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Publication of EP0576729A1 publication Critical patent/EP0576729A1/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
    • F02M35/104—Intake manifolds
    • F02M35/112—Intake manifolds for engines with cylinders all in one line
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10078—Connections of intake systems to the engine
    • 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
    • F02M35/10131—Ducts situated in more than one plane; Ducts of one plane crossing ducts of another plane
    • 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
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • F02M35/10314—Materials for intake systems
    • F02M35/10321—Plastics; Composites; Rubbers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/08—Thermoplastics

Definitions

  • the invention relates to an intake manifold for an internal combustion engine according to the preamble of claim 1.
  • Such an intake manifold is known from GB-A-2 173 857.
  • the intake manifold is made of aluminum and comprises several parts, the bypass line being formed by two suction pipe parts connected to one another.
  • the two intake manifold parts which form the intake manifold and limit the bypass line, are attached to the cylinder head of the internal combustion engine.
  • the manufacture of the intake manifold, consisting of the two intake manifold parts, and their assembly are unsatisfactory.
  • an intake manifold is known, the intake flange of which consists of three separately produced parts which are connected to one another in a sandwich construction and fastened to the cylinder head.
  • the intake opening is formed by a bore in the cylinder head, which connects the inlet channel of the cylinder head to the bypass line, which extends in the middle of the three parts and is delimited by the two adjacent parts.
  • the task to be solved by the previously known component is seen in feeding the secondary gas as close as possible to the inlet valve.
  • an internal combustion engine which is operated with diesel fuel and has a crankcase ventilation.
  • the gas mixture emerging from the crankcase is fed into the intake air stream and thereby fed back to the combustion.
  • the gas mixture withdrawn from the crankcase is fed in by means of a distributor in the area of the intake manifold, the distributor being tubular.
  • the number of outlet openings of the distributor corresponds to the number of cylinders, the paths from the connection to the individual intake openings being of different lengths, which is unsatisfactory in terms of optimal combustion, since different amounts of the secondary gas are supplied to the individual cylinders.
  • the invention has for its object to further develop an intake manifold of the known type such that a bypass line for feeding a secondary gas is integrated into the intake manifold, that the intake manifold is inexpensive to manufacture in terms of production technology and economics and that undesirable material accumulations are avoided.
  • the bypass line is formed by a groove, open in the direction of the cylinder head, of the intake flange formed in one piece with the intake pipe, the bypass line being delimited on the side facing the cylinder head by a seal which is formed from an elastomeric material.
  • the advantage here is that the secondary gas is led to the connection and then into the bypass line, which is limited on the one hand by the intake flange and on the other hand in the direction of the cylinder head.
  • the gas passes through the bypass line directly into the intake opening of the internal combustion engine.
  • the bypass line is preferably arranged between the intake pipe and the openings for fastening the intake manifold.
  • the bypass line is particularly easy to manufacture, since the open groove in the direction of the cylinder head, like the rest of the intake manifold, can be removed from one side. Undesirable material accumulations, which are unsatisfactory from a manufacturing point of view, since they lead to different shrinkage, can be avoided in the construction and manufacture of the intake manifold according to the invention.
  • the groove extends directly to the cylinder head and is sealed thereon by a flat, molded part or a liquid seal.
  • the cross section of the bypass line can be optimally adapted to the particular circumstances of the application by the depth of the groove.
  • the bypass line is delimited on the side facing the cylinder head by a seal which is made of an elastomeric material.
  • the elastomeric material can enclose a seal carrier, which preferably consists of a hard plastic, wherein the connection can be formed in one piece with the seal carrier.
  • the seal can be positioned in the groove by an integrally molded holding device, which facilitates the assembly of the intake manifold.
  • the secondary gas can, for example, be vented from the crankcase of the internal combustion engine, the connection being connected to the crankcase ventilation of the internal combustion engine.
  • Another application of the intake manifold can be that the hose connection is connected to an exhaust gas recirculation device or an idle charge control of the internal combustion engine.
  • the secondary gases generated in these areas can be fed back into the machine and used for the combustion process.
  • connection can be arranged symmetrically between the intake pipes of the intake manifold, so that the bypass line consists of at least two sections of equal length.
  • the advantage here is that equal amounts of the secondary gas are fed into the intake pipes assigned to the individual cylinders and the same mixture is therefore available for all cylinders for optimal combustion.
  • the sections of the bypass line for the two middle intake pipes can be at least partially led around them, the two outer intake pipes being connected to the connection in the relatively more direct way.
  • connection can be designed as a hose connection and be made in one piece with the suction flange. This results in good sealing and good performance properties over a long period of use.
  • connection can be formed by at least one opening in the cylinder head.
  • the holding device can be formed, for example, by a holding section of the seal carrier projecting in the direction of the groove, wherein the holding section can be brought into engagement with the groove.
  • Uniform wall thicknesses of the intake manifold and the cross-section of the bypass line can be precisely maintained by using the seal, since the seal can, for example, close part of the groove open in the direction of the cylinder head with the holding device.
  • the intake manifold consists of a polymeric material.
  • the intake manifold is therefore easy to manufacture and has a significantly reduced weight compared to a metallic intake manifold.
  • the intake flange made of plastic can have openings for fastening to the cylinder head, into which non-creeping material bushings are inserted in a non-positive and / or positive manner, are used for example made of sintered metal.
  • the advantage here is that the intake manifold is permanently attached to the cylinder head and relaxation phenomena of the plastic used do not lead to an impairment of the properties of use.
  • the bushes are supported on the one hand directly on the cylinder head and on the other hand on the fastening element, for example on the screw.
  • the bushings can have a toothing which engages with the plastic of the intake manifold. This ensures power transmission between the bushing and flange.
  • FIG. 1 a view of the intake manifold is shown;
  • FIG. 2 shows a detail from the intake manifold according to FIG. 1.
  • FIG. 1 the view of an intake manifold for an internal combustion engine with 4 cylinders is shown, which comprises four intake pipes 1.1, 1.2, 1.3, 1.4 and an intake flange 2.
  • the bypass line 3 is provided with a connection 4, which is designed as a hose connection, and is used to feed a secondary gas into the internal combustion engine.
  • the connection 4 is connected to the crankcase of the internal combustion engine for ventilation.
  • the bypass line 3 is formed by a groove 5 in the intake flange 2, which is open in the direction of the cylinder head for easier manufacture.
  • the hose connection is formed in one piece with the intake flange 2 and connected to one end of the groove 5.
  • the groove 5 extends from the connection 4 to the intake manifold 1 of the intake manifold.
  • connection 4 is arranged symmetrically between the intake pipes 1.1 to 1.4 and the bypass line 3 is divided into four sections 3.1 to 3.4 of equal length.
  • the two intake pipes 1.2, 1.3 closest to the connection 4 are connected to the crankcase ventilation via the sections 3.2, 3.3, which at least partially extend along the circumference of the intake pipes 1.2, 1.3.
  • the sections 3.1, 3.4 of the bypass line 3, which lead from the connection 4 into the outer intake pipes 1.1, 1.4, have the same length as the adjacent sections 3.2, 3.3.
  • a seal 6 made of elastomeric material is provided to seal the intake flange 2 from the cylinder head.
  • the seal 6 comprises a seal carrier (9) made of a hard plastic, which is partially enclosed by elastomeric material.
  • the seal carrier 9 is positioned with a projection 9.1 in the groove 5.
  • the hose connection can be formed in one piece with the seal carrier 9.
  • Different configurations of the seal 6, for. B. without seal carrier 9.1 when using a connection 4, which is formed by an opening in the cylinder head, are also possible.
  • the groove 5 is arranged between the intake pipe 1 and the opening 7. The wall thicknesses of the intake manifold are essentially the same, so that undesirable material accumulations are avoided.
  • the bushing 8 which is inserted in the opening 7 in a non-positive and / or positive manner, consists in this exemplary embodiment of brass.
  • the bushing 8 has a surface structure in a partial region of its axial extent for secure fixing within the opening 7.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Gasket Seals (AREA)

Description

Die Erfindung betrifft einen Ansaugkrümmer für eine Verbrennungskraftmaschine gemäß Oberbegriff von Anspruch 1.The invention relates to an intake manifold for an internal combustion engine according to the preamble of claim 1.

Ein solcher Ansaugkrümmer ist aus der GB-A-2 173 857 bekannt. Der Ansaugkrümmer besteht aus Aluminium und umfaßt mehrere Teile, wobei die Bypassleitung durch zwei miteinander verbundene Saugrohrteile gebildet ist. Die beiden Saugrohrteile, die den Ansaugkrümmer bilden und die Bypassleitung begrenzen, sind am Zylinderkopf der Verbrennungskraftmaschine befestigt. Die Herstellung des Ansaugkrümmers, bestehend aus den beiden Saugrohrteilen sowie deren Montage sind wenig zufriedenstellend.Such an intake manifold is known from GB-A-2 173 857. The intake manifold is made of aluminum and comprises several parts, the bypass line being formed by two suction pipe parts connected to one another. The two intake manifold parts, which form the intake manifold and limit the bypass line, are attached to the cylinder head of the internal combustion engine. The manufacture of the intake manifold, consisting of the two intake manifold parts, and their assembly are unsatisfactory.

Aus der FR-A-2655 382, die dem Oberbegriff von Anspruch 1 bildet, ist ein Ansaugkrümmer bekannt, dessen Ansaugflansch aus drei seperat erzeugten Teilen besteht, die in einer Sandwichbauweise miteinander verbunden und am Zylinderkopf befestigt sind. Die Ansaugöffnung wird durch eine Bohrung im Zylinderkopf gebildet, die den Einlaßkanal des Zylinderkopfs mit der Bypassleitung verbindet, die sich im mittleren der drei Teile erstreckt und durch die beiden daran angrenzenden Teile begrenzt ist. Die Aufgabe, die durch das vorbekannte Bauteil gelöst werden soll, wird darin gesehen, das sekundäre Gas möglichst nahe am Einlaßventil einzuspeisen.From FR-A-2655 382, which forms the preamble of claim 1, an intake manifold is known, the intake flange of which consists of three separately produced parts which are connected to one another in a sandwich construction and fastened to the cylinder head. The intake opening is formed by a bore in the cylinder head, which connects the inlet channel of the cylinder head to the bypass line, which extends in the middle of the three parts and is delimited by the two adjacent parts. The task to be solved by the previously known component is seen in feeding the secondary gas as close as possible to the inlet valve.

Aus dem DE-GM 90 05 249.8 ist eine Brennkraftmaschine bekannt, die mit Dieselkraftstoff betrieben wird und eine Kurbelgehäuseentlüftung aufweist. Das aus dem Kurbelgehäuse austretende Gasgemisch wird in den Ansaugluftstrom eingespeist und dadurch erneut der Verbrennung zugeführt. Die Einspeisung des aus dem Kurbelgehäuse abgezogenen Gasgemischs erfolgt dabei mittels eines Verteilerstücks im Bereich der Ansaugstutzen, wobei das Verteilerstück rohrförmig ausgebildet ist. Die Anzahl der Auslaßöffnungen des Verteilers entspricht der Zylinderzahl, wobei die Wege vom Anschluß bis zu den einzelenen Ansaugöffnungen eine unterschiedliche Länge aufweisen, was im Hinblick auf eine optimale Verbrennung wenig zufriedenstellend ist, da den einzelenen Zylindern voneinander abweichende Mengen des sekundären Gases zugeführt werden.From DE-GM 90 05 249.8 an internal combustion engine is known which is operated with diesel fuel and has a crankcase ventilation. The gas mixture emerging from the crankcase is fed into the intake air stream and thereby fed back to the combustion. The gas mixture withdrawn from the crankcase is fed in by means of a distributor in the area of the intake manifold, the distributor being tubular. The number of outlet openings of the distributor corresponds to the number of cylinders, the paths from the connection to the individual intake openings being of different lengths, which is unsatisfactory in terms of optimal combustion, since different amounts of the secondary gas are supplied to the individual cylinders.

Der Erfindung liegt die Aufgabe zugrunde, einen Ansaugkrümmer der vorbekannten Art derart weiter zu entwickeln, daß eine Bypassleitung zur Einspeisung eines sekundären Gases in den Ansaugkrümmer integriert ist, daß der Ansaugkrümmer in fertigungstechnischer und wirtschaftlicher Hinsicht günstig herstellbar ist und daß unerwünschte Materialanhäufungen vermieden werden.The invention has for its object to further develop an intake manifold of the known type such that a bypass line for feeding a secondary gas is integrated into the intake manifold, that the intake manifold is inexpensive to manufacture in terms of production technology and economics and that undesirable material accumulations are avoided.

Diese Aufgabe wird bei dem erfindungsgemäßen Ansaugkrümmer durch Anspruch 1 gelöst, auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is achieved in the intake manifold according to the invention by claim 1, the advantageous claims refer to the subclaims.

Im Hinblick auf eine einfache und unkomplizierte Zuführung eines sekundären Gases in die Verbrennungskraftmaschine ist die Bypassleitung durch eine in Richtung des Zylinderkopfes offene Nut des einstückig mit dem Ansaugrohr ausgebildeten Ansaugflansches gebildet, wobei die Bypassleitung auf der dem Zylinderkopf zugewandten Seite durch eine Dichtung begrenzt ist, die aus einem elastomeren Werkstoff gebildet ist. Hierbei ist von Vorteil, daß das sekundäre Gas bis an den Anschluß geführt wird und anschließend in die Bypassleitung, die einerseits durch den Ansaugflansch und andererseits in Richtung des Zylinderkopfs begrenzt ist. Durch die Bypassleitung gelangt das Gas direkt in die Ansaugöffnung der Verbrennungskraftmaschine. Die Bypassleitung ist bevorzugt zwischen dem Ansaugrohr und den Durchbrechungen zur Befestigung des Ansaugkrümmers angeordnet. Die Bypassleitung ist besonders einfach herstellbar, da die in Richtung des Zylinderkopfs offene Nut, ebenso wie der Rest des Ansaugkrümmers von einer Seite entformt werden können. Unerwünschte Materialanhäufungen, die in fertigungstechnischer Hinsicht wenig befriedigend sind, da sie zu unterschiedlichem Schrumpf führen, können bei der Konstruktion und der Fertigung des erfindungsgemäßen Ansaugkrümmers vermieden werden. Im einfachsten Falle kann es vorgesehen sein, daß sich die Nut bis direkt an den Zylinderkopf erstreckt und an diesem durch eine Flach-, Formteil- oder eine Flüssigdichtung abgedichtet ist. Der Querschnitt der Bypassleitung kann den jeweiligen Gegebenheiten des Anwendungsfalls in optimaler Weise durch die Tiefe der Nut angepaßt sein.With regard to a simple and uncomplicated supply of a secondary gas to the internal combustion engine, the bypass line is formed by a groove, open in the direction of the cylinder head, of the intake flange formed in one piece with the intake pipe, the bypass line being delimited on the side facing the cylinder head by a seal which is formed from an elastomeric material. The advantage here is that the secondary gas is led to the connection and then into the bypass line, which is limited on the one hand by the intake flange and on the other hand in the direction of the cylinder head. The gas passes through the bypass line directly into the intake opening of the internal combustion engine. The bypass line is preferably arranged between the intake pipe and the openings for fastening the intake manifold. The bypass line is particularly easy to manufacture, since the open groove in the direction of the cylinder head, like the rest of the intake manifold, can be removed from one side. Undesirable material accumulations, which are unsatisfactory from a manufacturing point of view, since they lead to different shrinkage, can be avoided in the construction and manufacture of the intake manifold according to the invention. In the simplest case it can be provided that the groove extends directly to the cylinder head and is sealed thereon by a flat, molded part or a liquid seal. The cross section of the bypass line can be optimally adapted to the particular circumstances of the application by the depth of the groove.

Die Bypassleitung ist auf der dem Zylinderkopf zugewandten Seite durch eine Dichtung begrenzt, die aus einem elastomeren Werkstoff besteht. In Abhängigkeit von den jeweiligen Gegebenheiten des Anwendungsfalls kann das elastomere Material einen Dichtungsträger umschließen, der bevorzugt aus einem Hartkunststoff besteht, wobei der Anschluß einstückig mit dem Dichtungsträger ausgebildet sein kann. Die Dichtung kann in der Nut durch eine einstückig angeformte Haltevorrichtung positioniert sein, wodurch die Montage des Ansaugkrümmers erleichtert wird.The bypass line is delimited on the side facing the cylinder head by a seal which is made of an elastomeric material. Depending on the particular circumstances of the application, the elastomeric material can enclose a seal carrier, which preferably consists of a hard plastic, wherein the connection can be formed in one piece with the seal carrier. The seal can be positioned in the groove by an integrally molded holding device, which facilitates the assembly of the intake manifold.

Das sekundäre Gas kann beispielsweise aus dem Kurbelgehäuse der Verbrennungskraftmaschine entlüftet sein, wobei der Anschluß mit der Kurbelgehäuseentlüftung der Verbrennungskraftmaschine verbunden ist.The secondary gas can, for example, be vented from the crankcase of the internal combustion engine, the connection being connected to the crankcase ventilation of the internal combustion engine.

Eine andere Anwendung des Ansaugkrümmers kann darin bestehen, daß der Schlauchanschluß mit einer Abgasrückführvorrichtung oder einer Leerlauffüllungsregelung der Verbrennungskraftmaschine verbunden ist. Die in diesen Bereichen anfallenden, sekundären Gase können dadurch der Maschine wieder zugeführt und für den Verbrennungsablauf genutzt werden.Another application of the intake manifold can be that the hose connection is connected to an exhaust gas recirculation device or an idle charge control of the internal combustion engine. The secondary gases generated in these areas can be fed back into the machine and used for the combustion process.

Bei Verwendung des Ansaugkrümmers an mehrzylindrigen Verbrennungskraftmaschinen kann der Anschluß symmetrisch zwischen den Ansaugrohren des Ansaugkrümmers angeordnet sein, so daß die Bypassleitung aus zumindest zwei gleichlangen Teilabschnitten besteht. Hierbei ist von Vorteil, daß gleiche Mengen des sekundären Gases in die den einzelnen Zylindern zugeordneten Ansaugrohre geführt werden und dadurch für alle Zylinder das gleiche Gemisch für eine optimale Verbrennung bereitsteht. Bei einer 4-Zylinder Reihenmaschine beispielsweise und einer Anordnung des Anschlusses zwischen den beiden mittleren Ansaugrohren können die Teilabschnitte der Bypassleitung für die beiden mittleren Ansaugrohre zumindest teilweise um diese herumgeführt sein, wobei die beiden äußeren Ansaugrohre auf dem relativ direkteren Weg mit dem Anschluß verbunden sind.When using the intake manifold on multi-cylinder internal combustion engines, the connection can be arranged symmetrically between the intake pipes of the intake manifold, so that the bypass line consists of at least two sections of equal length. The advantage here is that equal amounts of the secondary gas are fed into the intake pipes assigned to the individual cylinders and the same mixture is therefore available for all cylinders for optimal combustion. In a 4-cylinder in-line engine, for example, and an arrangement of the connection between the two middle intake pipes, the sections of the bypass line for the two middle intake pipes can be at least partially led around them, the two outer intake pipes being connected to the connection in the relatively more direct way.

Gemäß einer vorteilhaften Ausgestaltung kann der Anschluß als Schlauchanschluß ausgebildet sein und einstückig mit dem Ansaugflansch ausgeführt sein. Eine gute Abdichtung und gute Gebrauchseigenschaften während einer langen Gebrauchsdauer sind dadurch bedingt.According to an advantageous embodiment, the connection can be designed as a hose connection and be made in one piece with the suction flange. This results in good sealing and good performance properties over a long period of use.

Nach einer anderen Ausgestaltung kann der Anschluß durch zumindest eine Öffnung im Zylinderkopf gebildet sein. Hierbei ist von Vorteil, daß keine zusätzliche Verschlauchung erforderlich ist, wodurch einerseits der Einbauraum der Verbrennungskraftmaschine nicht weiter begrenzt wird und andererseits Wartungs- und Kontrollarbeiten in diesem Bereich entfallen können.According to another embodiment, the connection can be formed by at least one opening in the cylinder head. The advantage here is that no additional tubing is required is, on the one hand the installation space of the internal combustion engine is not further limited and on the other hand maintenance and control work in this area can be omitted.

Die Haltevorrichtung kann beispielsweise durch einen in Richtung der Nut vorspringenden Halteabschnitt des Dichtungsträgers gebildet sein, wobei der Halteabschnitt mit der Nut in Eingriff bringbar ist. Gleichmäßige Wandstärken des Ansaugkrümmers und der Querschnitt der Bypassleitung können durch die Verwendung der Dichtung genau eingehalten werden, da die Dichtung beispielsweise mit der Haltevorrichtung einen Teil der in Richtung des Zylinderkopfes offenen Nut verschließen kann.The holding device can be formed, for example, by a holding section of the seal carrier projecting in the direction of the groove, wherein the holding section can be brought into engagement with the groove. Uniform wall thicknesses of the intake manifold and the cross-section of the bypass line can be precisely maintained by using the seal, since the seal can, for example, close part of the groove open in the direction of the cylinder head with the holding device.

Gemäß einer vorteilhaften Ausgestaltung ist es vorgesehen, daß der Ansaugkrümmer aus einem polymeren Werkstoff besteht. Der Ansaugkrümmer ist dadurch einfach herstellbar und weist im Vergleich zu einem metallischen Ansaugkrümmer ein deutlich verringertes Gewicht auf.According to an advantageous embodiment, it is provided that the intake manifold consists of a polymeric material. The intake manifold is therefore easy to manufacture and has a significantly reduced weight compared to a metallic intake manifold.

Der Ansaugflansch aus Kunststoff kann zur Befestigung am Zylinderkopf Durchbrechungen aufweisen, in die kraft- und/oder formschlüssig Buchsen aus einem nicht kriechenden Material, beispielsweise aus Sintermetall eingesetzt sind. Hierbei ist von Vorteil, daß der Ansaugkrümmer dauerhaft am Zylinderkopf befestigt ist und Relaxationserscheinungen des verwendeten Kunststoffs nicht zur einer Beeinträchtigung der Gebrauchseigenschaften führen. Die Buchsen stützen sich einerseits direkt am Zylinderkopf und andererseits am Befestigungselement, beispielsweise an der Schraube ab. Die Buchsen können beispielsweise im Bereich ihrer Oberfläche eine Verzahnung aufweisen, die mit dem Kunststoff des Ansaugkrümmers in Eingriff ist. Dadurch wird die Kraftübertragung zwischen Buchse und Flansch gewährleistet.The intake flange made of plastic can have openings for fastening to the cylinder head, into which non-creeping material bushings are inserted in a non-positive and / or positive manner, are used for example made of sintered metal. The advantage here is that the intake manifold is permanently attached to the cylinder head and relaxation phenomena of the plastic used do not lead to an impairment of the properties of use. The bushes are supported on the one hand directly on the cylinder head and on the other hand on the fastening element, for example on the screw. For example, in the area of their surface, the bushings can have a toothing which engages with the plastic of the intake manifold. This ensures power transmission between the bushing and flange.

Ein Ausführungsbeispiel des erfindungsgemäßen Ansaugkrümmers für eine Verbrennungskraftmaschine mit einem Zylinderkopf ist nachfolgend anhand der als Anlage beigefügten Zeichnungen weiter verdeutlicht. Diese zeigen die zu berücksichtigenden Einzelkomponenten teilweise in schematischer Darstellung.An embodiment of the intake manifold according to the invention for an internal combustion engine with a cylinder head is further illustrated below with reference to the accompanying drawings. These show the individual components to be taken into account, partly in a schematic representation.

In Figur 1 ist eine Ansicht des Ansaugkrümmers gezeigt; in Figur 2 ein Ausschnitt aus dem Ansaugkrümmer gemäß Figur 1.In Figure 1 a view of the intake manifold is shown; FIG. 2 shows a detail from the intake manifold according to FIG. 1.

In Figur 1 ist die Ansicht eines Ansaugkrümmers für eine Verbrennungskraftmaschine mit 4 Zylindern dargestellt, der vier Ansaugrohre 1.1, 1.2, 1.3, 1.4 und einen Ansaugflansch 2 umfaßt. Die Bypassleitung 3 ist mit einem Anschluß 4, der als Schlauchanschluß ausgebildet ist, versehen und dient zur Einspeisung eines sekundären Gases in die Verbrennungskraftmaschine. In diesem Ausführungsbeispiel ist der Anschluß 4 zur Entlüftung mit dem Kurbelgehäuses der Verbrennungskraftmaschine verbunden. Die Bypassleitung 3 ist durch eine Nut 5 in Ansaugflansch 2 gebildet, die zur leichteren Herstellung in Richtung des Zylinderkopfs offen ist. Der Schlauchanschluß ist in diesem Ausführungsbeispiel einstückig mit dem Ansaugflansch 2 ausgebildet und mit dem einen Ende der Nut 5 verbunden. Die Nut 5 erstreckt sich vom Anschluß 4 bis zum Ansaugrohr 1 des Ansaugkrümmers. Der Anschluß 4 ist symmetrisch zwischen den Ansaugrohren 1.1 bis 1.4 angeordnet und die Bypassleitung 3 ist in vier gleichlange Teilabschnitte 3.1 bis 3.4 aufgeteilt. Die beiden dem Anschluß 4 am nächsten liegenden Ansaugrohre 1.2, 1.3 sind über die Teilabschnitte 3.2, 3.3, die sich zumindest teilweise entlang des Umfangs der Ansaugrohre 1.2, 1.3 erstrecken, mit der Kurbelgehäuseentlüftung verbunden. Die Teilabschnitte 3.1, 3.4 der Bypassleitung 3, die vom Anschluß 4 in die äußeren Ansaugrohre 1.1, 1.4 führen, weisen die gleiche Länge auf, wie die benachbarten Teilabschnitte 3.2, 3.3.In Figure 1, the view of an intake manifold for an internal combustion engine with 4 cylinders is shown, which comprises four intake pipes 1.1, 1.2, 1.3, 1.4 and an intake flange 2. The bypass line 3 is provided with a connection 4, which is designed as a hose connection, and is used to feed a secondary gas into the internal combustion engine. In this embodiment, the connection 4 is connected to the crankcase of the internal combustion engine for ventilation. The bypass line 3 is formed by a groove 5 in the intake flange 2, which is open in the direction of the cylinder head for easier manufacture. In this exemplary embodiment, the hose connection is formed in one piece with the intake flange 2 and connected to one end of the groove 5. The groove 5 extends from the connection 4 to the intake manifold 1 of the intake manifold. The connection 4 is arranged symmetrically between the intake pipes 1.1 to 1.4 and the bypass line 3 is divided into four sections 3.1 to 3.4 of equal length. The two intake pipes 1.2, 1.3 closest to the connection 4 are connected to the crankcase ventilation via the sections 3.2, 3.3, which at least partially extend along the circumference of the intake pipes 1.2, 1.3. The sections 3.1, 3.4 of the bypass line 3, which lead from the connection 4 into the outer intake pipes 1.1, 1.4, have the same length as the adjacent sections 3.2, 3.3.

Zur Abdichtung des Ansaugflanschs 2 gegenüber dem Zylinderkopf ist eine Dichtung 6 aus elastomerem Werkstoff vorgesehen. Wie in Figur 2 dargestellt, umfaßt die Dichtung 6 einen Dichtungsträger (9) aus einem Hartkunststoff, der von elastomerem Werkstoff teilweise umschlossen ist. Der Dichtungsträger 9 ist mit einem Vorsprung 9.1 in der Nut 5 positioniert. Nach einem von Figur 1 abweichenden Ausführungsbeispiel kann der Schlauchanschluß einstückig mit dem Dichtungsträger 9 ausgebildet sein. Abweichende Ausgestaltungen der Dichtung 6, z. B. ohne Dichtungsträger 9.1 bei Verwendung eines Anschlusses 4, der durch eine Öffnung im Zylinderkopf gebildet ist, sind ebenfalls möglich. Die Nut 5 ist zwischen dem Ansaugrohr 1 und der Durchbrechung 7 angeordnet. Die Wandstärken des Ansaugkrümmers sind im wesentlichen gleich, so daß unerwünschte Materialanhäufungen vermieden werden. Die Buchse 8, die in der Durchbrechung 7 kraft- und/oder formschlüssig eingesetzt ist, besteht in diesem Ausführungsbeispiel aus Messing. Die Buchse 8 weisen in einem Teilbereich ihrer axialen Erstreckung eine Oberflächenstruktur zur sicheren Festlegung innerhalb der Durchbrechung 7 auf. Die Verwendung von Buchsen 8 aus davon abweichendem, nicht kriechendem Material, wie beispielsweise Sintermetall, ist ebenfalls möglich.A seal 6 made of elastomeric material is provided to seal the intake flange 2 from the cylinder head. As shown in Figure 2, the seal 6 comprises a seal carrier (9) made of a hard plastic, which is partially enclosed by elastomeric material. The seal carrier 9 is positioned with a projection 9.1 in the groove 5. According to an embodiment which differs from FIG. 1, the hose connection can be formed in one piece with the seal carrier 9. Different configurations of the seal 6, for. B. without seal carrier 9.1 when using a connection 4, which is formed by an opening in the cylinder head, are also possible. The groove 5 is arranged between the intake pipe 1 and the opening 7. The wall thicknesses of the intake manifold are essentially the same, so that undesirable material accumulations are avoided. The bushing 8, which is inserted in the opening 7 in a non-positive and / or positive manner, consists in this exemplary embodiment of brass. The bushing 8 has a surface structure in a partial region of its axial extent for secure fixing within the opening 7. The use of bushings 8 made of a different, non-creeping material, such as sintered metal, is also possible.

Claims (13)

  1. An intake manifold for an internal combustion engine with one cylinder head, comprising at least one intake pipe (1) with an intake flange (2) for gas-tight fastening to the cylinder head, there being provided a bypass conduit (3) for feeding a secondary gas into an intake orifice of the internal combustion engine, the gas being capable of being fed into the bypass conduit (3) by means of a connection (4), and the connection (4) being connected to one end of the bypass conduit (3) and the intake orifice to the other end of the latter, the bypass conduit (3) being formed by a groove (5), open in the direction of the cylinder head, of the intake flange (2), and the bypass conduit (3) being limited, on the side facing the cylinder head, by a gasket (6), characterized in that the intake pipe (1) is designed in one piece with the intake flange (2), and in that the gasket (6) is positioned in the groove (5) and is formed from an elastomeric material.
  2. An intake manifold according to claim 1, characterized in that the gasket (6) is formed from an elastomeric material surrounding a gasket carrier (9).
  3. An intake manifold according to claim 2, characterized in that the connection (4) is designed in one piece with the gasket carrier (9).
  4. An intake manifold according to claim 3, characterized in that the gasket carrier (9) has at least one holding device in the region of the bypass conduit (3).
  5. An intake manifold according to any one of claims 1 to 4, characterized in that the connection (4) is connected to the crankcase ventilation of the internal combustion engine.
  6. An intake manifold according to any one of claims 1 to 4, characterized in that the connection (4) is connected to an exhaust-gas return device.
  7. An intake manifold according to any one of claims 1 to 4, characterized in that the connection (4) is connected to an idle filling control device.
  8. An intake manifold according to any one of claims 1 to 7, with at least two intake pipes, characterized in that the connection (4) is arranged symmetrically between the intake pipes (1.1, 1.2) and the bypass conduit (3) consists of at least two portions (3.1, 3.2) of equal length.
  9. An intake manifold according to any one of claims 1 to 8, characterized in that the connection (4) is designed as a hose connection, and in that the hose connection is made in one piece with the intake flange (2).
  10. An intake manifold according to any one of claims 1 to 8, characterized in that the connection (4) is formed by at least one orifice in the cylinder head.
  11. An intake manifold according to any one of claims 1 to 10, characterized by the use of a polymeric material.
  12. An intake manifold according to claim 11, characterized in that the intake flange (2) has perforations (7) for fastening to the cylinder head, and in that bushes (8) made of an anti-creep material are inserted non-positively and/or positively into the perforations (7).
  13. An intake manifold according to claim 12, characterized in that the bushes (8) consist of a sintered metal.
EP92121543A 1992-07-03 1992-12-18 Intake manifold for an internal combustion engine with one cylinder head Expired - Lifetime EP0576729B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4221913 1992-07-03
DE4221913A DE4221913C1 (en) 1992-07-03 1992-07-03 Intake manifold for an internal combustion engine with a cylinder head

Publications (2)

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EP0576729A1 EP0576729A1 (en) 1994-01-05
EP0576729B1 true EP0576729B1 (en) 1995-11-08

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EP (1) EP0576729B1 (en)
JP (1) JP2643774B2 (en)
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JPH0674113A (en) 1994-03-15
JP2643774B2 (en) 1997-08-20
DE59204268D1 (en) 1995-12-14
US5341772A (en) 1994-08-30
DE4221913C1 (en) 1994-01-27
EP0576729A1 (en) 1994-01-05

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