EP0816668B1 - Thin-walled suction tube for an internal combustion engine - Google Patents

Thin-walled suction tube for an internal combustion engine Download PDF

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Publication number
EP0816668B1
EP0816668B1 EP97106127A EP97106127A EP0816668B1 EP 0816668 B1 EP0816668 B1 EP 0816668B1 EP 97106127 A EP97106127 A EP 97106127A EP 97106127 A EP97106127 A EP 97106127A EP 0816668 B1 EP0816668 B1 EP 0816668B1
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EP
European Patent Office
Prior art keywords
intake manifold
valve
opening
internal combustion
combustion engine
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
EP97106127A
Other languages
German (de)
French (fr)
Other versions
EP0816668A3 (en
EP0816668A2 (en
Inventor
Hans-Ulrich Kühnel
Franz Dellen
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.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pierburg GmbH filed Critical Pierburg GmbH
Priority to EP02004931A priority Critical patent/EP1211409A1/en
Publication of EP0816668A2 publication Critical patent/EP0816668A2/en
Publication of EP0816668A3 publication Critical patent/EP0816668A3/en
Application granted granted Critical
Publication of EP0816668B1 publication Critical patent/EP0816668B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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.
  • a suction pipe is known from DE 25 26 550 A.
  • This document describes that the causes of intake manifold explosions, which lead to the partial or total destruction of mixture preparation systems in internal combustion engines due to breakage or fire, can be traced back to ignitions of the air / fuel mixture upstream with the intake valve open or sucked in during the suction stroke. Because of these ignitions, there is a disproportionate increase in the pressure in the intake manifold, as a result of which the intake manifold is damaged or even destroyed. Such a destruction could not occur with "thick-walled” intake manifolds because the material strength of the intake manifold was sufficient to withstand the disproportionate pressure.
  • Such "thick-walled” suction pipes were, for example, made of sand cast with wall thicknesses of about 4 millimeters and had no separating seams. These suction pipes were heavy and stable.
  • Suction pipes made of correspondingly lighter materials are manufactured.
  • Made in series from die-cast aluminum or plastic injection Intake pipes have a wall thickness of about 2 millimeters. Because of the Manufacturing process such suction pipes have a joint at which two halves of the Suction pipe can be connected to each other, or a separating seam on that above certain pressures as well as the small "thin" wall thickness form a weak point.
  • an auxiliary outlet (opening) is provided to avoid damage to the suction pipe and to discharge the disproportionate pressure, which is opened when a predetermined pressure is exceeded within the suction pipe.
  • the secondary outlet is initially closed by a pot-shaped cover, which can be placed on a nozzle on the outside of the intake manifold wall.
  • this pot-shaped lid has the decisive disadvantage that it releases the secondary outlet when intake manifold explosions occur and thus creates a pressure equalization in the atmosphere; after the suction pipe explosion has subsided and the auxiliary outlet has been released, further operation of the internal combustion engine is in no way possible, since after opening the auxiliary outlet the circuit of the fuel pump or the ignition current of the internal combustion engine is interrupted.
  • the object of the invention is a generic intake manifold to be designed in such a way that the disadvantages described are avoided.
  • the drawing shows a section through a section 1 of a downstream one, not shown Throttle valve connector lying plastic / metal intake pipe, which to one of the Cylinder of the internal combustion engine leads.
  • this intake manifold is provided downstream of the throttle valve connector to arrange an opening 2 leading into the atmosphere by a pressure in the intake manifold 1 responsive valve 3 is controlled.
  • This valve 3 is a so-called elastomer umbrella valve 4, which projects into a central opening 6 with a stem 5 and through a pin extension 7 a screw bushing 8 is held.
  • the screw bushing 8 has a collar ring 10 which is spaced apart by ribs 9 and onto which a cover flap 11 is pushed on and clipped to it, the ribs 9 of the screw bushing 8 form a tool attachment 12, so that the screw bushing 8 in the opening 2 can be screwed in.
  • the invention is based on the knowledge that the bursting of the suction pipes 1 by after the ignition of the internal combustion engine which occasionally occurs of stored / condensed in the intake manifold 1 and with that contained in the intake manifold 1 Air mixed fuel / fuel vapor residues is caused.
  • this pressure increase is achieved by opening the Valve 3 limited.
  • the air / fuel gas can escape into the free atmosphere.
  • the burning gas cools down through ribs 13 divided opening 2 and also in the outlet opening 13 covered by the cap 11 between the screw bushing 8 and collar ring 10.
  • valve 3 closes again, the internal combustion engine remains operational.
  • the cap 11 prevents dirt and water from entering the opening 2.

Description

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

Ein Saugrohr ist aus der DE 25 26 550 A bekannt.
In dieser Entgegenhaltung ist beschrieben, daß die Ursachen von Saugrohrexplosionen, die zur teilweisen oder ganzen Zerstörungen von Gemischaufbereitungsanlagen bei Brennkraftmaschinen durch Bruch oder Brand führen, auf Zündungen des bei offenem Einlaßventils vorgelagerten oder während des Saughubes angesaugten Luft-Kraftstoff-Gemisches zurückzuführen sind. Aufgrund dieser Zündungen kommt es zu einem überproportionalen Anstieg des Druckes in dem Saugrohr, wodurch das Saugrohr beschädigt oder sogar zerstört wird. Bei "dickwandigen" Saugrohren konnte es zu einer solchen Zerstörung nicht kommen, da die Materialstärke des Saugrohres ausreichte, um dem überproportionalen Druck standzuhalten. Solche "dickwandigen" Saugrohre waren beispielsweise aus Sandguß mit Wandstärken von etwa 4 Millimetern hergestellt und wiesen keine Trenn-Nähte auf. Diese Saugrohre waren schwer und stabil.A suction pipe is known from DE 25 26 550 A.
This document describes that the causes of intake manifold explosions, which lead to the partial or total destruction of mixture preparation systems in internal combustion engines due to breakage or fire, can be traced back to ignitions of the air / fuel mixture upstream with the intake valve open or sucked in during the suction stroke. Because of these ignitions, there is a disproportionate increase in the pressure in the intake manifold, as a result of which the intake manifold is damaged or even destroyed. Such a destruction could not occur with "thick-walled" intake manifolds because the material strength of the intake manifold was sufficient to withstand the disproportionate pressure. Such "thick-walled" suction pipes were, for example, made of sand cast with wall thicknesses of about 4 millimeters and had no separating seams. These suction pipes were heavy and stable.

Bei modernen Brennkraftmaschinen steht die Gewichtsersparnis im Vordergrund, so daß Saugrohre aus entsprechend leichteren Materialien (insbesondere Kunststoff oder Aluminium) gefertigt werden. Aus Aluminium-Druckguß oder Kunststoff-Spritzguß in Serie hergestellte Saugrohre haben eine Wandstärke von etwa 2 Millimetern. Aufgrund des Herstellungsverfahrens weisen solche Saugrohre eine Stoßstelle, an der zwei Hälften des Saugrohres miteinander verbunden werden, oder eine Trenn-Naht auf, die oberhalb bestimmter Drücke genauso wie die geringe "dünne" Wandstärke eine Schwachstelle bilden.In modern internal combustion engines, the focus is on saving weight, so that Suction pipes made of correspondingly lighter materials (especially plastic or aluminum) are manufactured. Made in series from die-cast aluminum or plastic injection Intake pipes have a wall thickness of about 2 millimeters. Because of the Manufacturing process such suction pipes have a joint at which two halves of the Suction pipe can be connected to each other, or a separating seam on that above certain pressures as well as the small "thin" wall thickness form a weak point.

Bei der DE 25 26 550 A ist zur Vermeidung von Beschädigungen des Saugrohres und zum Abführen des überproportionalen Druckes ein Nebenauslaß (Öffnung) vorgesehen, der bei Übersteigen eines vorbestimmten Druckes innerhalb des Saugrohres geöffnet wird. Dabei ist der Nebenauslaß zunächst durch einen topfförmigen Deckel geschlossen, der auf einem Stutzen an der Außenseite der Saugrohrwand aufsetzbar ist. Dieser topfförmige Deckel hat jedoch den entscheidenden Nachteil, daß er zwar beim Auftreten von Saugrohrexplosionen den Nebenauslaß freigibt und somit einen Druckausgleich in die Atmosphäre herstellt; nach Abklingen der Saugrohrexplosion und Freigabe des Nebenauslasses ist der weitere Betrieb der Brennkraftmaschine jedoch auf keinen Fall möglich, da nach dem Öffnen des Nebenauslasses der Stromkreis der Kraftstoffpumpe oder der Zündstrom der Brennkraftmaschine unterbrochen wird. Um die Brennkraftmaschine wieder in Betrieb zu setzen, muß der Deckel erst wieder aufgesetzt werden, um beispielsweise den Stromkreis für die Kraftstoffpumpe wieder zu schließen und die Brennkraftmaschine anzulassen. Das bedeutet, daß das Fahrzeug im Falle einer Saugrohrexplosion stehen bleibt, wodurch besonders während der Fahrt sicherheitskritische Situationen auftreten können. Außerdem ist nicht gewährleistet, daß der Fahrer des Fahrzeuges in der Lage ist, beim Ausfall der Brennkraftmaschine die Öffnung mit dem Deckel wieder zu verschließen, so daß ggfs. das Fahrzeug in die Werkstatt abgeschleppt werden muß.
Ein gattungsgemäßes Saugrohr ist aus der EP 0 280 122 A 2 bekannt.In DE 25 26 550 A an auxiliary outlet (opening) is provided to avoid damage to the suction pipe and to discharge the disproportionate pressure, which is opened when a predetermined pressure is exceeded within the suction pipe. The secondary outlet is initially closed by a pot-shaped cover, which can be placed on a nozzle on the outside of the intake manifold wall. However, this pot-shaped lid has the decisive disadvantage that it releases the secondary outlet when intake manifold explosions occur and thus creates a pressure equalization in the atmosphere; after the suction pipe explosion has subsided and the auxiliary outlet has been released, further operation of the internal combustion engine is in no way possible, since after opening the auxiliary outlet the circuit of the fuel pump or the ignition current of the internal combustion engine is interrupted. In order to put the engine back into operation, the cover must first be put back on, for example to close the circuit for the fuel pump again and to start the engine. This means that the vehicle stops in the event of an intake manifold explosion, which can result in safety-critical situations, especially while driving. In addition, there is no guarantee that the driver of the vehicle will be able to close the opening with the cover if the internal combustion engine fails, so that the vehicle may have to be towed to the workshop.
A generic suction pipe is known from EP 0 280 122 A 2.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein gattungsgemäßes Saugrohr derart zu gestalten, daß die geschilderten Nachteile vermieden werden.Proceeding from this, the object of the invention is a generic intake manifold to be designed in such a way that the disadvantages described are avoided.

Diese Aufgabe ist durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale gelöst worden. Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.This object is achieved by the features specified in the characterizing part of patent claim 1 been solved. Advantageous further developments are specified in the subclaims.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben.An embodiment of the invention is shown in the drawing and is below described.

Die Zeichnung zeigt einen Schnitt durch einen Abschnitt 1 eines stromab eines nicht dargestellten Drosselklappenstutzens liegenden Kunststoff-/Metallsaugrohres, das zu einem der Zylinder der Brennkraftmaschine führt.The drawing shows a section through a section 1 of a downstream one, not shown Throttle valve connector lying plastic / metal intake pipe, which to one of the Cylinder of the internal combustion engine leads.

Erfindungsgemäß ist bei diesem Saugrohr vorgesehen, stromab des Drosselklappenstutzens eine in die Atmosphäre führende Öffnung 2 anzuordnen, die durch ein auf den Druck im Saugrohr 1 ansprechendes Ventil 3 gesteuert wird.According to the invention, this intake manifold is provided downstream of the throttle valve connector to arrange an opening 2 leading into the atmosphere by a pressure in the intake manifold 1 responsive valve 3 is controlled.

Bei diesem Ventil 3 handelt es sich hier um ein sogenanntes Elastomer-Regenschirmventil 4, das mit einem Stiel 5 in eine zentrale Öffnung 6 hineinragt und durch einen Stiftansatz 7 einer Schraubbuchse 8 gehalten ist.This valve 3 is a so-called elastomer umbrella valve 4, which projects into a central opening 6 with a stem 5 and through a pin extension 7 a screw bushing 8 is held.

Die Schraubbuchse 8 weist einen durch Rippen 9 beabstandeten Kragenring 10 auf, auf den eine Abdecklappe 11 aufgeschoben und mit diesem verklippst ist, wobei die Rippen 9 der Schraubbuchse 8 einen Werkzeugansatz 12 bilden, so daß die Schraubbuchse 8 in die Öffnung 2 eingeschraubt werden kann.The screw bushing 8 has a collar ring 10 which is spaced apart by ribs 9 and onto which a cover flap 11 is pushed on and clipped to it, the ribs 9 of the screw bushing 8 form a tool attachment 12, so that the screw bushing 8 in the opening 2 can be screwed in.

Die Erfindung basiert auf der Erkenntnis, daß das Bersten der Saugrohre 1 durch nach dem Anlassen der Brennkraftmaschine gelegentlich auftretendes explosionsartiges Entzünden von im Saugrohr 1 gespeicherten/kondensierten und mit der im Saugrohr 1 enthaltenen Luft gemischten Brennstoff-/Brennstoff-dampfrückständen verursacht wird.The invention is based on the knowledge that the bursting of the suction pipes 1 by after the ignition of the internal combustion engine which occasionally occurs of stored / condensed in the intake manifold 1 and with that contained in the intake manifold 1 Air mixed fuel / fuel vapor residues is caused.

Hierdurch entsteht im Saugrohr 1 eine Flamm-Druckwelle, die durch die im Leerlaufbetrieb nach dem Starten geschlossene Drosselklappe nicht nach außen gelangen kann und dadurch einen hohen Druckanstieg bewirkt, der eine Zerstörung des Saugrohres verursachen kann.This creates a flame pressure wave in the intake manifold 1, which by the idle operation throttle valve closed after starting cannot escape to the outside and thereby causes a high pressure rise, which cause destruction of the intake manifold can.

Durch die erfindungsgemäßen Maßnahmen wird dieser Druckanstieg durch Öffnen des Ventils 3 begrenzt. Die Luft/das Brenngas kann in die freie Atmosphäre austreten. In der durch Rippen 13 aufgeteilten Öffnung 2 kühlt sich das brennende Gas ab und ebenso in der durch die Abdeckkappe 11 abgedeckten Auslaßöffnung 13 zwischen Schraubbuchse 8 und Kragenring 10. Danach schließt das Ventil 3 wieder, die Brennkraftmaschine bleibt betriebsbereit. Die Abdeckkappe 11 verhindert den Eintritt von Schmutz und Wasser in die Öffnung 2.Through the measures according to the invention, this pressure increase is achieved by opening the Valve 3 limited. The air / fuel gas can escape into the free atmosphere. In the the burning gas cools down through ribs 13 divided opening 2 and also in the outlet opening 13 covered by the cap 11 between the screw bushing 8 and collar ring 10. Then valve 3 closes again, the internal combustion engine remains operational. The cap 11 prevents dirt and water from entering the opening 2.

Claims (3)

  1. Thin-walled intake manifold (1) for an internal combustion engine comprising connection channels, which lead to the cylinders of the i.c. engine, and at least one throttle valve connection piece, by means of which the combustion air taken in by the i.c. engine is controlled, wherein the intake manifold (1) has an opening (2), which is disposed downstream of the throttle valve connection piece and leads into the atmosphere and which, when a predetermined pressure inside the intake manifold (1) is exceeded, is opened so that the wall of the intake manifold (1) is not damaged by the predetermined pressure being exceeded, wherein the opening (2) is controlled by a valve (3), which responds to an excess pressure in the intake manifold (1), and the valve (3) automatically closes again after removal of the excess pressure, characterized in that the valve (3) is formed by an elastomeric umbrella valve (4), which projects with a stem (5) into a central opening (6) and is held by a pin projection (7) of a threaded bush (8).
  2. Intake manifold according to claim 1, characterized in that the threaded bush (8) has a collar ring (10), which is held at a distance by ribs (9) and onto which a cap (11) is pushed and fastened by clipping thereon.
  3. Intake manifold according to claim 2, characterized in that the ribs (9) of the threaded bush (8) form a tool projection (12), so that the threaded bush (9) may be screwed into the opening (2).
EP97106127A 1996-06-27 1997-04-15 Thin-walled suction tube for an internal combustion engine Expired - Lifetime EP0816668B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02004931A EP1211409A1 (en) 1996-06-27 1997-04-15 Thin-walled suction tube for an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19625768A DE19625768B4 (en) 1996-06-27 1996-06-27 Thin-walled intake manifold for an internal combustion engine
DE19625768 1996-06-27

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP02004931A Division EP1211409A1 (en) 1996-06-27 1997-04-15 Thin-walled suction tube for an internal combustion engine

Publications (3)

Publication Number Publication Date
EP0816668A2 EP0816668A2 (en) 1998-01-07
EP0816668A3 EP0816668A3 (en) 1998-04-22
EP0816668B1 true EP0816668B1 (en) 2002-09-18

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EP02004931A Withdrawn EP1211409A1 (en) 1996-06-27 1997-04-15 Thin-walled suction tube for an internal combustion engine
EP97106127A Expired - Lifetime EP0816668B1 (en) 1996-06-27 1997-04-15 Thin-walled suction tube for an internal combustion engine

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EP02004931A Withdrawn EP1211409A1 (en) 1996-06-27 1997-04-15 Thin-walled suction tube for an internal combustion engine

Country Status (8)

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US (1) US5826554A (en)
EP (2) EP1211409A1 (en)
JP (1) JP3893192B2 (en)
KR (1) KR100472870B1 (en)
BR (1) BR9703747A (en)
DE (2) DE19625768B4 (en)
ES (1) ES2179236T3 (en)
MX (1) MX9704054A (en)

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DE10047197A1 (en) 2000-09-23 2002-04-25 Bosch Gmbh Robert Intake pipe for an internal combustion engine
DE10131110A1 (en) * 2001-06-27 2003-01-09 Mann & Hummel Filter Intermediate flange system for a direct injection internal combustion engine
WO2003066146A1 (en) * 2002-02-04 2003-08-14 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
US6571753B1 (en) 2002-03-20 2003-06-03 Brunswick Corporation Passive air vent for a marine engine
ES2278295T3 (en) * 2004-09-28 2007-08-01 Magneti Marelli Powertrain S.P.A. MULTIPLE ADMISSION CONDUCT WITH AIR CONTAINER FOR AN INTERNAL COMBUSTION ENGINE.
DE102009048209A1 (en) * 2009-10-05 2011-04-07 Mann + Hummel Gmbh Air filter for an internal combustion engine
JP5959156B2 (en) * 2011-04-11 2016-08-02 株式会社セキソー Manufacturing method of duct connecting part
US9873325B1 (en) 2014-10-22 2018-01-23 Hydro-Gear Limited Partnership Drive apparatus

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EP0280122A2 (en) * 1987-02-24 1988-08-31 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Suction device for an internal-combustion engine

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Also Published As

Publication number Publication date
BR9703747A (en) 1998-08-11
DE19625768B4 (en) 2009-04-16
EP0816668A3 (en) 1998-04-22
US5826554A (en) 1998-10-27
DE59708238D1 (en) 2002-10-24
DE19625768A1 (en) 1998-01-02
EP0816668A2 (en) 1998-01-07
EP1211409A1 (en) 2002-06-05
JP3893192B2 (en) 2007-03-14
KR980002784A (en) 1998-03-30
KR100472870B1 (en) 2005-05-20
ES2179236T3 (en) 2003-01-16
MX9704054A (en) 1997-12-31
JPH1054314A (en) 1998-02-24

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