EP0571663B1 - Intake conduit for an internal combustion engine - Google Patents

Intake conduit for an internal combustion engine Download PDF

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Publication number
EP0571663B1
EP0571663B1 EP92121555A EP92121555A EP0571663B1 EP 0571663 B1 EP0571663 B1 EP 0571663B1 EP 92121555 A EP92121555 A EP 92121555A EP 92121555 A EP92121555 A EP 92121555A EP 0571663 B1 EP0571663 B1 EP 0571663B1
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EP
European Patent Office
Prior art keywords
intake pipe
designed
spigot
bellows
internal combustion
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
EP92121555A
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German (de)
French (fr)
Other versions
EP0571663A1 (en
Inventor
Michael Brümmer
Detlef Dr. Cordts
Klaus Döhring
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Carl Freudenberg KG
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Carl Freudenberg KG
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Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP0571663A1 publication Critical patent/EP0571663A1/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
    • F02M35/10144—Connections of intake ducts to each other or to another device
    • 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
    • F02M35/10026—Plenum chambers
    • F02M35/10032—Plenum chambers specially shaped or arranged connecting duct between carburettor or air inlet duct and the plenum chamber; specially positioned carburettors or throttle bodies with respect to the plenum chamber
    • 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
    • F02M35/10236—Overpressure or vacuum relief means; Burst protection
    • 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
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10301—Flexible, resilient, pivotally or movable parts; Membranes
    • 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
    • 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
    • F02M35/10229—Fluid connections to the air intake system; their arrangement of pipes, valves or the like the intake system acting as a vacuum or overpressure source for auxiliary devices, e.g. brake systems; Vacuum chambers
    • 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
    • F02M35/10373—Sensors for intake systems
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/6851—With casing, support, protector or static constructional installations
    • Y10T137/6855—Vehicle

Definitions

  • the invention relates to an intake pipe for an internal combustion engine with a safety valve which can be brought into the open position by a pressure in the interior which exceeds the atmospheric pressure, the safety valve consisting of a ring sleeve made of rubber-elastic material.
  • Such an intake pipe is known from EP 0 280 122 A2.
  • the intake pipe is equipped with a burst protection, which preferably has a separate opening of the intake system and an elastic, lip-like sealing element that cooperates in a biased manner with a limitation of the opening.
  • the lip-like sealing element is designed as a flap valve and, depending on the design, lifts off its sealing surface at a predetermined overpressure within the intake pipe.
  • Intake pipes for internal combustion engines are generally known and mostly consist of a metallic material or plastic.
  • the wall thickness of the previously known intake pipes is often dimensioned such that combustion pressures, which can return to the intake pipe if the internal combustion engine is incorrectly set, can be absorbed without damage. It should be noted, however, that the wall thicknesses of such intake pipes have a considerable thickness, which both in is less satisfactory in terms of production technology and in terms of economy and functionality. Thin-walled plastic intake pipes often cannot withstand the excess pressure and burst.
  • the invention has for its object to further develop an intake pipe of the type mentioned in such a way that the ring sleeve is held securely outside the cross section of the intake pipe when there is negative pressure in the intake pipe.
  • the ring sleeve sealingly encloses a wall opening of the intake pipe in the area of its outer diameter and a pin in the area of its inner diameter, that the ring sleeve is designed as a bellows, that the bellows and the pin each have an adapted surface profile and that the surface profiles can be sealingly engaged with one another when subjected to negative pressure.
  • the wall thicknesses of the intake pipe can be dimensioned to be comparatively thin-walled, since the excess pressure that can be present in the intake pipe is reduced via the safety valve.
  • Such an intake pipe has good performance characteristics over a long period of use, is simple and inexpensive to manufacture in terms of production technology, and has a low weight.
  • FIG. 2 also shows a section of an intake pipe, the ring collar being fixed on the intake pipe on the one hand and in the axial direction on the other hand on a vacuum connection which can be snapped into the wall opening of the intake pipe.
  • the bellows 9 is designed as a preassembled unit 10 with the vacuum port 8.
  • the outer diameter 5 of the bellows 9 is held captive in an undercut and is supported in the region of its inner diameter 7 on the vacuum connection 8.
  • the bellows 9 briefly lifts off the vacuum connection 8 until the overpressure is released from the intake pipe and a pressure equalization with the atmosphere is established.
  • the bellows 9 can be provided with reinforcement or stiffening ribs at least in the area of the wall opening 3 of the intake pipe 4.
  • the preassembled unit 10 can be attached to the suction pipe by friction welding / rotary welding or snapping.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Check Valves (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

Die Erfindung betrifft ein Ansaugrohr für eine Verbrennungskraftmaschine mit einem Sicherheitsventil, das durch einen den atmosphärischen Druck übersteigenden Druck im Inneren in Offenstellung bringbar ist, wobei das Sicherheitsventil aus einer Ringmanschette aus gummielastischem Werkstoff besteht.The invention relates to an intake pipe for an internal combustion engine with a safety valve which can be brought into the open position by a pressure in the interior which exceeds the atmospheric pressure, the safety valve consisting of a ring sleeve made of rubber-elastic material.

Ein solches Ansaugrohr ist aus der EP 0 280 122 A2 bekannt. Das Ansaugrohr ist zur Vermeidung von Beschädigungen aus Verpuffungen von Kraftstoff-Luftgemischen in Sauganlagen mit einem Berstschutz ausgerüstet, der vorzugsweise eine gesonderte Öffnung der Sauganlage sowie ein elastisches, lippenartiges Dichtelement aufweist, das vorgespannt mit einer Begrenzung der Öffnung zusammenwirkt. Das lippenartige Dichtelement ist als Flatterventil ausgebildet und hebt, abhängig von der Auslegung, bei einem vorher bestimmten Überdruck innerhalb des Ansaugrohrs von seiner Dichtfläche ab.Such an intake pipe is known from EP 0 280 122 A2. To prevent damage from deflagration of fuel-air mixtures in intake systems, the intake pipe is equipped with a burst protection, which preferably has a separate opening of the intake system and an elastic, lip-like sealing element that cooperates in a biased manner with a limitation of the opening. The lip-like sealing element is designed as a flap valve and, depending on the design, lifts off its sealing surface at a predetermined overpressure within the intake pipe.

Ansaugrohre für Verbrennungskraftmaschinen sind allgemein bekannt und bestehen zumeist aus einem metallischen Werkstoff oder aus Kunststoff. Die Wandstärke der vorbekannten Ansaugrohre ist oftmals so dimensioniert, daß Verbrennungsdrücke, die bei unsachgemäß eingestellter Verbrennungskraftmaschine in das Ansaugrohr zurückschlagen können, unbeschadet aufgenommen werden können. Dabei ist allerdings zu beachten, daß die Wandstärken derartiger Ansaugrohre eine erhebliche Dicke aufweisen, was sowohl in fertigungstechnischer und in wirtschaftlicher als auch in funktionstechnischer Hinsicht wenig befriedigend ist. Dünnwandig ausgelegt Kunststoffansaugrohre halten oftmals den auftretenden Überdruck nicht aus und bersten.Intake pipes for internal combustion engines are generally known and mostly consist of a metallic material or plastic. The wall thickness of the previously known intake pipes is often dimensioned such that combustion pressures, which can return to the intake pipe if the internal combustion engine is incorrectly set, can be absorbed without damage. It should be noted, however, that the wall thicknesses of such intake pipes have a considerable thickness, which both in is less satisfactory in terms of production technology and in terms of economy and functionality. Thin-walled plastic intake pipes often cannot withstand the excess pressure and burst.

Der Erfindung liegt die Aufgabe zugrunde, ein Ansaugrohr der Eingangs genannten Art derart weiterzuentwickeln, daß die Ringmanschette bei im Ansaugrohr anliegendem Unterdruck sicher außerhalb des Durchtrittsquerschnitts des Ansaugrohrs gehalten wird.The invention has for its object to further develop an intake pipe of the type mentioned in such a way that the ring sleeve is held securely outside the cross section of the intake pipe when there is negative pressure in the intake pipe.

Diese Aufgabe wird erfindungsgemäß mit Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is achieved with claim 1. The subclaims refer to advantageous refinements.

Im Rahmen der vorliegenden Erfindung ist es vorgesehen, daß die Ringmanschette eine Wanddurchbrechung des Ansaugrohrs im Bereich ihres Außendurchmessers und einen Zapfen im Bereich ihres Innendurchmessers dichtend umschließt, daß die Ringmanschette als Faltenbalg ausgebildet ist, daß der Faltenbalg und der Zapfen jeweils ein aneinander angepaßtes Oberflächenprofil aufweisen und daß die Oberflächenprofile bei Unterdruckbeaufschlagung dichtend miteinander in Eingriff bringbar sind. Durch das Sicherheitsventil können die Wandstärken des Ansaugrohrs vergleichsweise dünnwandig dimensioniert werden, da der Überdruck, der im Ansaugrohr anliegen kann, über das Sicherheitsventil abgebaut wird. Ein derartiges Ansaugrohr weist gute Gebrauchseigenschaften während einer langen Gebrauchsdauer auf, ist in fertigungstechnischer Hinsicht einfach und kostengünstig herstellbar und hat ein geringes Gewicht.In the context of the present invention, it is provided that the ring sleeve sealingly encloses a wall opening of the intake pipe in the area of its outer diameter and a pin in the area of its inner diameter, that the ring sleeve is designed as a bellows, that the bellows and the pin each have an adapted surface profile and that the surface profiles can be sealingly engaged with one another when subjected to negative pressure. With the safety valve, the wall thicknesses of the intake pipe can be dimensioned to be comparatively thin-walled, since the excess pressure that can be present in the intake pipe is reduced via the safety valve. Such an intake pipe has good performance characteristics over a long period of use, is simple and inexpensive to manufacture in terms of production technology, and has a low weight.

Durch die Ausgestaltung des Zapfens gemäß der Form des Faltenbalgs legen sich die beiden Teile unter Unterdruckbeaufschlagung gasdicht aneinander an, so daß vorherbestimmbare Druckverhältnisse zur Motorsteuerung im Ansaugrohr herrschen. Die Ringmanschette wird bei im Ansaugrohr anliegendem Unterdruck nicht durch die Wanddurchbrechung hindurch in Richtung des Ansaugrohrs verformt. Bei eventuell auftretendem Überdruck innerhalb des Ansaugrohrs und damit innerhalb des Zapfens wird die schlauchförmige Ringmanschette aus gummielastischem Werkstoff ebenfalls druckbeaufschlagt und hebt von der Oberfläche des Zapfen ab, so daß sich ein Druckausgleich mit der Atmosphäre ergibt. Die Ringmanschette wird dabei nur in radialer Richtung belastet. Die Befestigung der Ringmanschette auf dem Zapfen wird durch eine Reib- und/oder formschlüssige Verbindung der Ringmanschette auf dem Zapfen vorgenommen. Die Ringmanschette kann beispielsweise innenumfangsseitig auf der dem Ansaugrohr zugewandten Seite mit einem zumindest teilweise umlaufenden Vorsprung versehen sein, der in eine in Richtung der Ringmanschette offene, umlaufende Nut des Zapfens eingeschnappt ist.Due to the design of the pin according to the shape of the bellows, the two parts lie against each other in a gas-tight manner under vacuum, so that predeterminable pressure conditions for engine control prevail in the intake pipe. The ring sleeve is not deformed through the wall opening in the direction of the intake pipe when there is negative pressure in the intake pipe. If there is any overpressure inside the intake pipe and thus inside the pin, the tubular ring sleeve made of rubber-elastic material is also pressurized and lifts off the surface of the pin, so that there is a pressure equalization with the atmosphere. The ring sleeve is only loaded in the radial direction. The ring sleeve is fastened to the pin by a friction and / or positive connection of the ring sleeve to the pin. The ring sleeve can, for example, be provided on the inner circumferential side on the side facing the suction pipe with an at least partially circumferential projection which is snapped into a circumferential groove of the pin which is open in the direction of the ring sleeve.

Die Ringmanschette kann im Bereich der Wanddurchbrechung des Ansaugrohrs mit einer Armierung oder Versteifungsrippen versehen sein um bei dem üblicherweise im Ansaugrohr anliegenden Unterdruck nicht durch die Wanddurchbrechungen hindurch in Richtung des Ansaugrohrs verformt zu werden.The ring sleeve can be provided in the area of the wall opening of the intake pipe with reinforcement or stiffening ribs so as not to be deformed through the wall openings in the direction of the intake pipe in the case of the negative pressure which is usually present in the intake pipe.

Der Zapfen kann als Unterdruckanschluß oder als Sensoranschluß ausgebildet sein. Der Faltenbalg kann dabei im Bereich seiner axialen Enden durch Ringwulste verstärkt sein, um auch bei Überdruckbeaufschlagung eine sichere Festlegung zumindest im Bereich des Ansaugrohrs zu gewährleisten. Bei Überdruckbeaufschlagung des inneren des Ansaugrohrs bleibt der Außendurchmesser des Faltenbalgs weitgehend dicht im Bereich der Wanddurchbrechung angeordnet, während sich die ansonsten dichte Verbindung zwischen dem Zapfen und dem Faltenbalg öffnet und für einen Druckausgleich mit der Atmosphäre sorgt. Einem Bersten des Ansaugrohres wird dadurch zuverlässig vorgebeugt.The pin can be designed as a vacuum connection or as a sensor connection. The bellows can be reinforced in the area of its axial ends by annular beads, in order to ensure a secure fixation at least in the area of the intake pipe even when subjected to excess pressure. When the inside of the intake pipe is pressurized, the outer diameter of the bellows remains largely tight in the area of the wall opening, while the otherwise tight connection between the pin and the bellows opens and ensures pressure equalization with the atmosphere. This reliably prevents the intake pipe from bursting.

Die Ringmanschette und der Zapfen können als vormontierbare Einheit ausgebildet und gemeinsam an dem Saugrohr befestigbar sein. Die Befestigung der Einheit kann beispielsweise durch eine Einschnappvorrichtung erfolgen, die in eine Öffnung des Ansaugrohrs einschnappbar ist. Davon abweichende Befestigungsmöglichkeiten sind ebenfalls denkbar wie beispielsweise Kleben oder Rotationsschweißen.The ring sleeve and the pin can be designed as a preassembled unit and can be fastened together on the suction pipe. The unit can be fastened, for example, by a snap-in device which can be snapped into an opening in the intake pipe. Different ones Fastening options are also conceivable, such as gluing or rotary welding.

Das erfindungsgemäße Ansaugrohr wird nachfolgend anhand der als Anlage beigefügten Zeichnungen weiter erläutert. Diese zeigen die zu berücksichtigenden Einzelkomponenten in geschnittener und teilweise schematischer Darstellung.The suction pipe according to the invention is explained in more detail below with reference to the drawings attached as an appendix. These show the individual components to be taken into account in a sectional and partially schematic representation.

In Figur 1 ist ein Ausschnitt aus einem Ansaugrohr gezeigt, bei dem der Zapfen als Unterdruckanschluß ausgebildet ist und die Ringmanschette, die als Faltenbalg ausgebildet ist, als vormontierbare Einheit ausgeführt sind und nachträglich durch Rotationsschweißen mit dem Ansaugrohr verbunden werden.In Figure 1, a section of an intake pipe is shown, in which the pin is designed as a vacuum connection and the ring sleeve, which is designed as a bellows, are designed as a preassembled unit and are subsequently connected to the intake pipe by rotary welding.

In Figur 2 ist ebenfalls ein Ausschnitt aus einem Ansaugrohr dargestellt, wobei die Ringmanschette einerseits am Ansaugrohr und in axialer Richtung andererseits an einem in die Wanddurchbrechung des Ansaugrohrs einschnappbaren Unterdruckanschluß festgelegt ist.FIG. 2 also shows a section of an intake pipe, the ring collar being fixed on the intake pipe on the one hand and in the axial direction on the other hand on a vacuum connection which can be snapped into the wall opening of the intake pipe.

In den Figuren 1 und 2 ist jeweils ein Ausführungsbeispiel eines Ansaugrohrs für eine Verbrennungskraftmaschine dargestellt, das mit einem Sicherheitsventil versehen ist, wobei das Sicherheitsventil 1 durch einen den atmosphärischen Druck übersteigenden Druck im inneren 2 in Offenstellung bringbar ist.FIGS. 1 and 2 each show an embodiment of an intake pipe for an internal combustion engine, which is provided with a safety valve, the safety valve 1 being able to be brought into the open position by a pressure in the interior 2 that exceeds the atmospheric pressure.

In den Figuren 1 und 2 ist das Sicherheitsventil 1 durch eine Ringmanschette aus gummielastischem Werkstoff gebildet, die faltenbalgartig ausgebildet ist und eine Wanddurchbrechung 3, die als Unterdruckanschluß 8 genutzt werden kann, bei Unterdruckbeaufschlagung abdichtet. Der Unterdruckanschluß 8 kann beispielsweise mit der Kurbelgehäuseentlüftung der Verbrennnungskraftmaschine verbunden sein.In Figures 1 and 2, the safety valve 1 is formed by an annular sleeve made of rubber-elastic material, which is formed like a bellows and seals a wall opening 3, which can be used as a vacuum connection 8, when subjected to negative pressure. The vacuum connection 8 can for example be connected to the crankcase ventilation of the internal combustion engine.

In Figur 1 ist der Faltenbalg 9 als vormontierbare Einheit 10 mit dem Unterdruckanschluß 8 ausgeführt. Der Außendurchmesser 5 des Faltenbalgs 9 ist in einer Hinterschneidung unverlierbar gehalten und im Bereich seines Innendurchmessers 7 auf dem Unterdruckanschluß 8 abgestützt. Bei Überdruck im inneren 2 des Ansaugrohrs 4, der beispielsweise bei fehlerhaft eingestellter Verbrennungskraftmaschine durch den Verbrennungsdruck gebildet sein kann, hebt der Faltenbalg 9 kurzzeitig vom Unterdruckanschluß 8 ab, bis der Überdruck aus dem Saugrohr abgebaut und ein Druckausgleich mit der Atmosphäre hergestellt ist. Zur Verbesserung der Gebrauchseigenschaften kann der Faltenbalg 9 zumindest im Bereich der Wanddurchbrechung 3 des Ansaugrohrs 4 mit einer Armierung oder Versteifungsrippen versehen sein. Die vormontierbare Einheit 10 kann durch Reibschweißen/Rotationsschweißen oder Einschnappen am Ansaugrohr befestigt werden.In Figure 1, the bellows 9 is designed as a preassembled unit 10 with the vacuum port 8. The outer diameter 5 of the bellows 9 is held captive in an undercut and is supported in the region of its inner diameter 7 on the vacuum connection 8. In the event of overpressure in the interior 2 of the intake pipe 4, which can be formed, for example, by the combustion pressure when the internal combustion engine is set incorrectly, the bellows 9 briefly lifts off the vacuum connection 8 until the overpressure is released from the intake pipe and a pressure equalization with the atmosphere is established. To improve the performance characteristics, the bellows 9 can be provided with reinforcement or stiffening ribs at least in the area of the wall opening 3 of the intake pipe 4. The preassembled unit 10 can be attached to the suction pipe by friction welding / rotary welding or snapping.

In Figur 2 ist der Zapfen 6, der auch in diesem Beispiel als Unterdruckanschluß 8 ausgebildet ist, in die Wanddurchbrechung 3 des Ansaugrohrs 4 eingeschnappt. Der Unterdruckanschluß 8 ist dadurch in axialer Richtung räumlich fixiert. Die Ringmanschette in Form eines Faltenbalgs 9 ist einerseits im Bereich ihres Außendurchmessers 5 an eine einstückig mit dem Ansaugrohr 4 ausgebildeten Aufnahme und andererseits im Bereich ihres Innendurchmessers 7 mit dem Unterdruckanschluß 8 verbunden. Die vorteilhafte Wirkungsweise unterscheidet sich von der Wirkungsweise der Ausgestaltung nach Figur 1 nicht.In Figure 2, the pin 6, which is also formed in this example as a vacuum connection 8, snapped into the wall opening 3 of the suction pipe 4. The vacuum connection 8 is thereby spatially fixed in the axial direction. The ring sleeve in the form of a bellows 9 is connected on the one hand in the area of its outer diameter 5 to a receptacle formed in one piece with the intake pipe 4 and on the other hand in the area of its inner diameter 7 to the vacuum connection 8. The advantageous mode of operation does not differ from the mode of operation of the embodiment according to FIG. 1.

Die Ansaugrohre gemäß der Figuren 1 und 2 bestehen aus einem geeigneten Kunststoff wie z. B. Polyamid, ebenso wie der in den Figuren 1 und 2 zweistückig mit dem Ansaugrohr 4 ausgebildete Unterdruckanschluß 8. Eine davon abweichende Materialwahl ist durchaus möglich.The intake pipes according to Figures 1 and 2 consist of a suitable plastic such. B. polyamide, as well as the two-piece vacuum connection 8 formed in FIGS. 1 and 2, and a different choice of material is quite possible.

Claims (5)

  1. An intake pipe for an internal combustion engine with a safety valve (1) which can be moved into the open position by a pressure in the interior (2) which exceeds atmospheric pressure, the safety valve (1) comprising an annular collar made of rubber-elastic material, characterized in that the annular collar surrounds in a sealing manner a wall opening (3) in the intake pipe (4) in the region of its outside diameter (5) and a spigot (6) in the region of its inside diameter (7), in that the annular collar is designed as a bellows (9), in that the bellows (9) and the spigot (6) each have a mutually matching surface profile and in that the surface profiles can be brought into sealing engagement with one another when subjected to reduced pressure.
  2. An intake pipe according to claim 1, characterized in that the spigot (6) is designed as a vacuum connection (8).
  3. An intake pipe according to claim 1, characterized in that the spigot (6) is designed as a sensor connection.
  4. An intake pipe according to any one of claims 1 to 3, characterized in that the annular collar and the spigot (6) are designed as a unit (10) that can be preassembled and in that the unit (10) can be secured on the intake pipe.
  5. An intake pipe according to claim 4, characterized in that the unit (10) is provided with a snap-in device (11) for the purpose of securing it.
EP92121555A 1992-05-23 1992-12-18 Intake conduit for an internal combustion engine Expired - Lifetime EP0571663B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4217191A DE4217191C2 (en) 1992-05-23 1992-05-23 Intake pipe for an internal combustion engine
DE4217191 1992-05-23

Publications (2)

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EP0571663A1 EP0571663A1 (en) 1993-12-01
EP0571663B1 true EP0571663B1 (en) 1996-03-06

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ID=6459633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92121555A Expired - Lifetime EP0571663B1 (en) 1992-05-23 1992-12-18 Intake conduit for an internal combustion engine

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US (1) US5317995A (en)
EP (1) EP0571663B1 (en)
JP (1) JPH0674114A (en)
DE (2) DE4217191C2 (en)

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US5507256A (en) * 1995-06-14 1996-04-16 Ford Motor Company Intake manifold positive pressure relief disk
DE29513019U1 (en) * 1995-08-12 1995-10-19 Fa. Andreas Stihl, 71336 Waiblingen Internal combustion engine for a hand-held implement
US5771863A (en) * 1996-10-11 1998-06-30 Siemens Electric Limited Integrated intake manifold and fuel rail with enclosed fuel filter
DE19826261A1 (en) * 1998-06-15 1999-12-16 Mann & Hummel Filter Intake system
FR2793525B1 (en) * 1999-05-12 2001-07-27 Mark Iv Systemes Moteurs Sa INTAKE ASSEMBLY FOR A HEAT ENGINE VEHICLE COMPRISING AN OVERPRESSURE LIMITING MEANS
WO2007006410A1 (en) * 2005-07-08 2007-01-18 Mündener Gummiwerk Gmbh Sleeve of a charge air hose which is used to fix the charge air hose to a nozzle and method for fixing the nozzle
DE102014002439B3 (en) * 2014-02-20 2015-07-02 Mtu Friedrichshafen Gmbh Insulation for a component of an internal combustion engine
CN105370459B (en) * 2014-08-18 2018-05-25 陕西重型汽车有限公司 Bellows guide support, component and automobile air inlet system
US10711818B2 (en) 2016-07-01 2020-07-14 Mann+Hummel Gmbh One-time only snap connection system mounting two parts and a sensor mounting system using the snap connection system

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US3692337A (en) * 1970-09-04 1972-09-19 Avica Corp Flexible coupling
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US4133347A (en) * 1977-10-31 1979-01-09 Albert Mercer Waste evacuation attachment for recreational vehicles
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Also Published As

Publication number Publication date
DE4217191A1 (en) 1993-12-16
JPH0674114A (en) 1994-03-15
DE59205608D1 (en) 1996-04-11
EP0571663A1 (en) 1993-12-01
US5317995A (en) 1994-06-07
DE4217191C2 (en) 1994-03-31

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