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EP0455622B1 - Intake silencer, in particular for two stroke internal combustion engines - Google Patents

Intake silencer, in particular for two stroke internal combustion engines Download PDF

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Publication number
EP0455622B1
EP0455622B1 EP91890079A EP91890079A EP0455622B1 EP 0455622 B1 EP0455622 B1 EP 0455622B1 EP 91890079 A EP91890079 A EP 91890079A EP 91890079 A EP91890079 A EP 91890079A EP 0455622 B1 EP0455622 B1 EP 0455622B1
Authority
EP
European Patent Office
Prior art keywords
chamber
chambers
internal combustion
combustion engines
inlet tube
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
EP91890079A
Other languages
German (de)
French (fr)
Other versions
EP0455622A1 (en
Inventor
Christian Dipl. Ing. Beidl
Albin Sterbenz
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.)
Individual
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Individual
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Filing date
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Publication of EP0455622A1 publication Critical patent/EP0455622A1/en
Application granted granted Critical
Publication of EP0455622B1 publication Critical patent/EP0455622B1/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
    • F02M35/14—Combined air cleaners and silencers
    • 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
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1211—Flow throttling or guiding by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
    • 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
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1227—Flow throttling or guiding by using multiple air intake flow paths, e.g. bypass, honeycomb or pipes opening into an expansion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • the invention relates to an intake silencer with an air filter, in particular for two-stroke internal combustion engines, consisting of a rigid housing which is divided by a partition into two chambers which are connected by at least two pipes passing through the partition, the first larger chamber having an inlet pipe and one Has filter insert and the connecting tubes connecting the two chambers have different diameters and / or lengths.
  • Such an intake silencer is already known (AT-B 235 089).
  • a primary damper chamber and an intermediate damper chamber are also provided, the one connecting pipe as a clean air pipe merging into a diffuser section which leads to the outlet or is connected to the carburetor.
  • This connecting tube has only slit-shaped openings within the second chamber, namely the secondary damper chamber and the primary damper chamber.
  • a second shorter connecting pipe with a smaller diameter extends from the Clean air chamber only in the intermediate damper chamber, which has no outlet opening. So there is a comparatively complicated sheet metal design in which increased pressure losses are to be expected. Since the muffler is only flowed through in one direction, there is insufficient damping due to the lack of appropriate reflections.
  • the invention is therefore based on the object of providing an intake silencer of the type described at the outset which, with a comparatively simple construction, ensures good sound absorption even with high engine output.
  • the invention achieves the object in that the second chamber has an outlet pipe and that the inlet pipe consists of a diffuser divided into two or more channels of different lengths.
  • the inlet pipe is designed as a diffuser, there are lower pressure losses without having to enlarge the diameter and thereby achieve poorer acoustic values.
  • the channels of different lengths in the diffuser make a significant contribution to improving the damping caused by interference. Due to the different dimensions of the actual connecting pipes, the formation of pronounced natural frequencies is suppressed, which also improves noise damping. In addition, there is a simplified construction, since there are really only two chambers.
  • the inlet pipe forming the diffuser is arranged opposite the connecting pipes or these opposite the outlet pipe in the sense of reversing the direction of flow in the first and / or second chamber.
  • an insulating insert which is separated from the housing wall by an air gap is provided in the second chamber. This insulating insert reduces the sound transmission to the housing and thus the sound radiation from the housing surface.
  • Different lengths of the pipes or channels are achieved in the simplest way in that the outlet end of the inlet pipe and at least one of the two ends of the connecting pipes each have an edge which is oblique to the pipe axis.
  • the intake silencer has a rigid housing 1, which is divided into two chambers 1a, 1b by a partition 2.
  • the partition 2 is interrupted by three connecting pipes 3, 4, 5, which lead from the chamber 1a into the chamber 1b.
  • the chamber 1a has an inlet pipe 6 which forms a diffuser which is divided into four channels 8 of different lengths by a cross-shaped insert 7. The different length of these channels 8 will achieved in that the outlet end of the inlet tube 6 has an edge 9 inclined to the tube axis.
  • An air filter 10 is inserted in the chamber 1a.
  • the three connecting pipes 3, 4, 5 have different diameters and, due to their likewise inclined edge 9a, also have different lengths.
  • An outlet connection 11 leads from the chamber 1b to the internal combustion engine.
  • the arrangement of the inlet pipe 6 with respect to the connecting pipes 3, 4, 5 or the latter with respect to the outlet connection 11 is provided such that the direction of flow of the sucked-in air reverses both in the first larger chamber 1a and in the second chamber 1b.
  • an insulation insert 12 is provided which is separated from the housing wall by an air gap in order to reduce the sound transmission to the housing 1 and thus to radiate sound from the housing surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Description

Die Erfindung betrifft einen Ansauggeräuschdämpfer mit Luftfilter, insbesondere für Zweitakt-Brennkraftmaschinen, bestehend aus einem steifen Gehäuse, das durch eine Trennwand in zwei Kammern unterteilt ist, die durch wenigstens zwei die Trennwand durchsetzende Rohre verbunden sind, wobei die erste größere Kammer ein Eintrittsrohr sowie einen Filtereinsatz aufweist und die die beiden Kammern verbindenden Verbindungsrohre unterschiedliche Durchmesser und/oder Längen besitzen.The invention relates to an intake silencer with an air filter, in particular for two-stroke internal combustion engines, consisting of a rigid housing which is divided by a partition into two chambers which are connected by at least two pipes passing through the partition, the first larger chamber having an inlet pipe and one Has filter insert and the connecting tubes connecting the two chambers have different diameters and / or lengths.

Ein derartiger Ansauggeräuschdämpfer ist bereits bekannt (AT-B 235 089). Dabei sind aber außer den beiden Kammern, nämlich dem sogenannten Reinluftraum und der Sekundärdämpferkammer noch eine Primärdämpferkammer und eine Zwischendämpferkammer vorgesehen, wobei das eine Verbindungsrohr als Reinluftrohr in einen Diffusorabschnitt übergeht, der zum Auslaß führt bzw. mit dem Vergaser in Verbindung steht. Dieses Verbindungsrohr hat innerhalb der zweiten Kammer, nämlich der Sekundärdämpferkammer und der Primärdämpferkammer nur schlitzförmige Öffnungen. Ein zweites kürzeres Verbindungsrohr mit kleinerem Durchmesser reicht von der Reinluftkammer nur in die Zwischendämpferkammer, die keine Austrittsöffnung besitzt. Es liegt also eine vergleichsweise komplizierte Blechausführung vor, bei der mit erhöhten Druckverlusten zu rechnen ist. Da der Geräuschdämpfer nur in einer Richtung durchströmt wird, kommt es mangels entsprechender Reflexionen zu einer ungenügenden Dämpfung.Such an intake silencer is already known (AT-B 235 089). In addition to the two chambers, namely the so-called clean air chamber and the secondary damper chamber, a primary damper chamber and an intermediate damper chamber are also provided, the one connecting pipe as a clean air pipe merging into a diffuser section which leads to the outlet or is connected to the carburetor. This connecting tube has only slit-shaped openings within the second chamber, namely the secondary damper chamber and the primary damper chamber. A second shorter connecting pipe with a smaller diameter extends from the Clean air chamber only in the intermediate damper chamber, which has no outlet opening. So there is a comparatively complicated sheet metal design in which increased pressure losses are to be expected. Since the muffler is only flowed through in one direction, there is insufficient damping due to the lack of appropriate reflections.

Somit liegt der Erfindung die Aufgabe zugrunde, einen Ansauggeräuschdämpfer der eingangs geschilderten Art zu schaffen, der bei vergleichsweise einfacher Konstruktion eine gute Schalldämpfung auch bei hoher Motorleistung gewährleistet.The invention is therefore based on the object of providing an intake silencer of the type described at the outset which, with a comparatively simple construction, ensures good sound absorption even with high engine output.

Die Erfindung löst die gestellte Aufgabe dadurch, daß die zweite Kammer ein Austrittsrohr aufweist und daß das Eintrittsrohr aus einem in zwei oder mehrere Kanäle unterschiedlicher Länge unterteilten Diffusor besteht.The invention achieves the object in that the second chamber has an outlet pipe and that the inlet pipe consists of a diffuser divided into two or more channels of different lengths.

Da das Eintrittsrohr als Diffusor ausgebildet ist, ergeben sich geringere Druckverluste, ohne den Durchmesser vergrößern zu müssen und dadurch schlechtere akustische Werte zu erzielen. Die im Diffusor vorhandenen Kanäle unterschiedlicher Länge tragen zur Verbesserung der Dämpfung durch Interferenzerscheinungen wesentlich bei. Durch die verschiedenen Abmessungen der tatsächlichen Verbindungsrohre wird die Ausbildung ausgeprägter Eigenfrequenzen unterdrückt, was ebenfalls die Geräuschdämpfung verbessert. Außerdem ergibt sich eine vereinfachte Konstruktion, da wirklich nur zwei Kammern vorgesehen sind.Since the inlet pipe is designed as a diffuser, there are lower pressure losses without having to enlarge the diameter and thereby achieve poorer acoustic values. The channels of different lengths in the diffuser make a significant contribution to improving the damping caused by interference. Due to the different dimensions of the actual connecting pipes, the formation of pronounced natural frequencies is suppressed, which also improves noise damping. In addition, there is a simplified construction, since there are really only two chambers.

In weiterer Ausbildung der Erfindung sind das den Diffusor bildende Eintrittsrohr gegenüber den Verbindungsrohren bzw. diese gegenüber dem Austrittsstutzen im Sinne einer Umkehr der Stömungsrichtung in der ersten und/oder zweiten Kammer angeordnet. Dadurch wird eine Verbesserung der Dampfung durch zusätzliche Reflexionen ohne Vergrößerung der Querschnitte bzw. Volumina erzielt.In a further embodiment of the invention, the inlet pipe forming the diffuser is arranged opposite the connecting pipes or these opposite the outlet pipe in the sense of reversing the direction of flow in the first and / or second chamber. As a result, the damping is improved by additional reflections without increasing the cross sections or volumes.

Besonders zweckmäßig ist es auch, wenn in der zweiten Kammer ein von der Gehäusewand durch einen Luftspalt getrennter Dämmeinsatz vorgesehen ist. Dieser Dämmeinsatz verringert die Schallübertragung auf das Gehäuse und damit die Schallabstrahlung von der Gehäuseoberfläche.It is also particularly expedient if an insulating insert which is separated from the housing wall by an air gap is provided in the second chamber. This insulating insert reduces the sound transmission to the housing and thus the sound radiation from the housing surface.

Verschiedene Längen der Rohre bzw. Kanäle werden auf die einfachste Weise dadurch erreicht, daß das Austrittsende des Eintrittsrohres und wenigstens eines der beiden Enden der Verbindungsrohre jeweils einen zur Rohrachse schrägen Rand aufweisen.Different lengths of the pipes or channels are achieved in the simplest way in that the outlet end of the inlet pipe and at least one of the two ends of the connecting pipes each have an edge which is oblique to the pipe axis.

In der Zeichnung ist der Erfindungsgegenstand in einem Ausführungsbeispiel dargestellt, und zwar zeigen

Fig. 1
einen Ansauggeräuschdämpfer im Längsschnitt nach der Linie I-I der Fig. 2 und
Fig. 2
einen zugehörigen Querschnitt nach der Linie II-II der Fig. 1.
In the drawing, the subject matter of the invention is shown in one embodiment, namely show
Fig. 1
an intake silencer in longitudinal section along the line II of Fig. 2 and
Fig. 2
an associated cross section along the line II-II of FIG. 1st

Der Ansauggeräuschdämpfer weist ein steifes Gehäuse 1 auf, das durch eine Trennwand 2 in zwei Kammern 1a, 1b, unterteilt ist. Die Trennwand 2 ist durch drei Verbindungsrohre 3, 4, 5, die von der Kammer 1a in die Kammer 1b führen, unterbrochen. Die Kammer 1a weist ein Eintrittsrohr 6 auf, das einen Diffusor bildet, der durch einen kreuzförmigen Einsatz 7 in vier Kanäle 8 unterschiedlicher Länge unterteilt ist. Die unterschiedliche Länge dieser Kanäle 8 wird dadurch erreicht, daß das Austrittsende des Eintrittsrohres 6 einen zur Rohrachse schrägen Rand 9 aufweist. In der Kammer 1a ist ein Luftfilter 10 eingesetzt.The intake silencer has a rigid housing 1, which is divided into two chambers 1a, 1b by a partition 2. The partition 2 is interrupted by three connecting pipes 3, 4, 5, which lead from the chamber 1a into the chamber 1b. The chamber 1a has an inlet pipe 6 which forms a diffuser which is divided into four channels 8 of different lengths by a cross-shaped insert 7. The different length of these channels 8 will achieved in that the outlet end of the inlet tube 6 has an edge 9 inclined to the tube axis. An air filter 10 is inserted in the chamber 1a.

Die drei Verbindungsrohre 3, 4, 5 weisen unterschiedliche Durchmesser und durch ihren ebenfalls schrägen Rand 9a auch unterschiedliche Längen auf. Von der Kammer 1b führt ein Austrittsstutzen 11 zur Brennkraftmaschine. Dabei ist die Anordnung des Einrtittsrohres 6 gegenüber den Verbindungsrohren 3, 4, 5 bzw. der letzteren gegenüber dem Austrittsstutzen 11 so vorgesehen, daß sich die Strömungsrichtung der angesaugten Luft sowohl in der ersten größeren Kammer 1a als auch in der zweiten Kammer 1b umkehrt. In der zweiten Kammer 1b ist zur Verminderung der Schallübertragung auf das Gehäuse 1 und damit zur Schallabstrahlung von der Gehäuseoberfläche ein von der Gehäusewand durch einen Luftspalt getrennter Dämmeinsatz 12 vorgesehen.The three connecting pipes 3, 4, 5 have different diameters and, due to their likewise inclined edge 9a, also have different lengths. An outlet connection 11 leads from the chamber 1b to the internal combustion engine. The arrangement of the inlet pipe 6 with respect to the connecting pipes 3, 4, 5 or the latter with respect to the outlet connection 11 is provided such that the direction of flow of the sucked-in air reverses both in the first larger chamber 1a and in the second chamber 1b. In the second chamber 1b, an insulation insert 12 is provided which is separated from the housing wall by an air gap in order to reduce the sound transmission to the housing 1 and thus to radiate sound from the housing surface.

Claims (4)

  1. An intake muffler with an air filter (10), more particularly for two-stroke internal combustion engines, consisting of a rigid housing divided into two chambers (1a, 1b) by a partition (2), the two chambers being interconnected by at least two tubes (3, 4, 5) extending through the partition (2), the first larger chamber (1a) having an inlet tube (6) and a filter insert (10) while the connecting tubes (3, 4, 5) connecting the two chambers (1a, 1b) have different diameters and/or lengths, characterised in that the second chamber (1b) has an outlet tube (11) and in that the inlet tube (6) consists of a diffuser divided into two or more ducts (8) of different lengths.
  2. An intake muffler according to claim 1,
    characterised in that the inlet tube (6) forming the diffuser is disposed opposite the connecting tubes (3, 4, 5) and the latter are disposed opposite the outlet tube (11) for the purpose of reversal of the direction of flow in the first chamber (1a) and/or second chamber (1b).
  3. An intake muffler according to claim 1 or 2,
    characterised in that an insulating insert (12) separated from the housing wall by an air gap is provided in the second chamber (1b).
  4. An intake muffler according to claim 1,
    characterised in that the outlet end of the inlet tube 6) and at least one of the two ends of the connecting tubes (3, 4, 5) each have an edge (9, 9a) at an angle to the tube axis.
EP91890079A 1990-04-30 1991-04-17 Intake silencer, in particular for two stroke internal combustion engines Expired - Lifetime EP0455622B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0098490A AT396510B (en) 1990-04-30 1990-04-30 SUCTION MUFFLER WITH AIR FILTER, ESPECIALLY FOR TWO-STROKE COMBUSTION ENGINES
AT984/90 1990-04-30

Publications (2)

Publication Number Publication Date
EP0455622A1 EP0455622A1 (en) 1991-11-06
EP0455622B1 true EP0455622B1 (en) 1993-06-23

Family

ID=3504278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91890079A Expired - Lifetime EP0455622B1 (en) 1990-04-30 1991-04-17 Intake silencer, in particular for two stroke internal combustion engines

Country Status (6)

Country Link
US (1) US5164550A (en)
EP (1) EP0455622B1 (en)
JP (1) JPH04228868A (en)
AT (1) AT396510B (en)
DE (1) DE59100163D1 (en)
ES (1) ES2041556T3 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5388408A (en) * 1993-10-01 1995-02-14 Lawrence-Keech Inc. Exhaust system for internal combustion engines
JP2895407B2 (en) * 1994-12-01 1999-05-24 本田技研工業株式会社 Intake silencer
USD540928S1 (en) 2005-08-11 2007-04-17 Briggs & Stratton Corporation Air cleaner cover
USD540929S1 (en) 2005-08-24 2007-04-17 Briggs & Stratton Corporation Air cleaner cover
US7441532B2 (en) 2006-02-15 2008-10-28 Briggs & Stratton Corporation Four-stroke internal combustion engine having reduced noise emissions
DE102006060271A1 (en) * 2006-12-20 2008-06-26 Volkswagen Ag Motor vehicle motor air filter housing, in two parts, has dividing walls defining chambers for air inflow/outflow and the filter with resonance chambers formed by reinforcement ribs
US7934582B2 (en) * 2007-09-07 2011-05-03 Go Green APU LLC Engine silencing and vibration reduction system and method
US8087492B2 (en) * 2010-03-08 2012-01-03 Huntair, Inc. Methods and systems for integrating sound attenuation into a filter bank
US8066096B1 (en) * 2010-11-04 2011-11-29 Hamilton Sundstrand Corporation Inlet silencer
DE102020122027B4 (en) * 2020-08-24 2023-05-04 Mann+Hummel Gmbh Silencer and filter system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT235089B (en) * 1962-05-16 1964-08-10 Knecht Filterwerke Gmbh Damper filter intended in particular for an internal combustion engine
IT208247Z2 (en) * 1986-10-17 1988-04-22 Gilardini Spa AIR INTAKE GROUP FOR INDUSTRIAL VEHICLES
US4782912A (en) * 1987-03-18 1988-11-08 Ford Motor Company Engine air cleaner - noise reducer
US4790864A (en) * 1987-12-16 1988-12-13 Ford Motor Company Compact engine air/cleaner with integrated components

Also Published As

Publication number Publication date
AT396510B (en) 1993-10-25
DE59100163D1 (en) 1993-07-29
US5164550A (en) 1992-11-17
ES2041556T3 (en) 1993-11-16
JPH04228868A (en) 1992-08-18
ATA98490A (en) 1993-01-15
EP0455622A1 (en) 1991-11-06

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