EP0834011B2 - Intake silencer for motor vehicle - Google Patents
Intake silencer for motor vehicle Download PDFInfo
- Publication number
- EP0834011B2 EP0834011B2 EP97920737A EP97920737A EP0834011B2 EP 0834011 B2 EP0834011 B2 EP 0834011B2 EP 97920737 A EP97920737 A EP 97920737A EP 97920737 A EP97920737 A EP 97920737A EP 0834011 B2 EP0834011 B2 EP 0834011B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- intake
- intake pipe
- resonator
- openings
- pipe
- 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
Links
- 230000003584 silencer Effects 0.000 title claims description 48
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000006098 acoustic absorber Substances 0.000 claims 1
- 239000003570 air Substances 0.000 description 17
- 238000013016 damping Methods 0.000 description 14
- 230000007423 decrease Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229920001875 Ebonite Polymers 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- 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
- F02M35/1216—Flow throttling or guiding by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators
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- 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
- F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
- F02M35/1266—Intake silencers ; Sound modulation, transmission or amplification using resonance comprising multiple chambers or compartments
Definitions
- the invention relates to an intake silencer for an internal combustion engine in the preamble of claim 1 mentioned type and a motor vehicle with internal combustion engine and supercharger with one Intake silencer.
- FIG. 1 of this document is a located immediately behind the intake air filter Muffler combination shown in which the intake manifold immediately behind the dust filter cartridge Provide wall openings and with an insulation material is surrounded.
- the intake pipe In the direction of flow behind this Section is the intake pipe with an axial sequence provide rows of holes arranged in a ring. each this row of holes is the one with the intake pipe outside surrounding chamber in connection.
- the pods are each one of the Sound waves from the intake air passing through rows of holes redirected so that the air flow in the intake pipe running in the opposite direction into the surrounding Chamber directed and on its radially aligned Ground to be steered.
- This chamber floor acts as a reflector. This sets them to the entry hole row returning reflected sound waves Acoustic conductance of those formed in the intake pipe Openings effectively so far down that an effectively coupled Intake noise reduction also at clearly frequencies placed in the lower frequency range is achieved.
- German patent DE 743 418 A known prior art thus teaches intake noise damping through resonance coupling to a reflection damper.
- dampers of this kind only suitable for low frequencies, for example for Damping of 2nd order motor pulsations, each have Chamber only a single defined resonance frequency on, that is, no matter how narrowly usable Frequency band, and also require a large one Construction space, both because of the structure of each individual reflector chamber as well because of the large number of the reflector chambers that are used to achieve at least one moderate broadness of the intake silencer required are.
- German patent DE 580 923 A is also used as an intake silencer or bullet silencer Designated exhaust damper for Internal combustion engines known as the single-tube resonance damper is trained.
- the the resonance wavelength Bores defining in the exhaust pipe are due the excess pressure in the exhaust pipe with an outer jacket surround. This coat affects that Damping behavior of the exhaust silencer impairing out.
- Another intake silencer is from the Publication US 4,350,223 A is known.
- This intake silencer is in a flexible, from a corrugated tube existing line used, the one the Ambient air intake opening in the body of the motor vehicle with the intake manifold of the air filter combines.
- This intake silencer dampens the Air noise within the intake area of a narrow frequency band that applies to both Extends sides of the resonance frequency of the resonator.
- a resonator constructed in the same way sees the technical teaching of the German patent application DE 32 34 634 A1, which is directly in the Intake of the filter is integrated.
- Two rows of openings connect the as the intake pipe of the intake silencer serving intake of the filter with the interior of the surrounding resonator. These two rows of openings are arranged so that, based on the specific natural resonance frequency of the intake manifold a ⁇ / 2 and ⁇ / 4 damping cause. This will make the effectiveness of the Dampers improved, but not its frequency range.
- An intake silencer "stuffed” with insulating material comparable design integrated into the Intake manifold of a charge air cooler is from the German Patent specification DE 35 31 353 C2 for an internal combustion engine known with charger.
- the intake silencer of the example above shown prior art show overall the disadvantage, only within a comparative dampen narrow frequency band usable.
- dampers are stuffed with insulation material only suitable for systems with only moderate overpressure exhibit.
- For use in a charger intake line are silencers damped with insulation unusable.
- turbochargers are currently used for this purpose are working to this end with rotor speeds to nearly 200 000 min -1. It is understandable that turbochargers with such a high profile of requirements can only remain practically economical with compromises on manufacturing tolerances. This is the reason for the strong acoustic radiation of such turbochargers, namely the typical "turbocharger whistle" in the frequency range of around 2 - 4 kHz. The charging process, even in the intake line, once again produces clearly radiating broadband noises in the frequency band of 4 - 6 kHz, which are referred to as "hissing".
- the object of the invention is accordingly the basis, one that can also be used for other purposes Broadband airborne sound absorbers, but especially an intake silencer for an internal combustion engine to create the smallest possible and flexible adaptable construction volume with flexible adjustment to the specific application requirements for airborne noise evenly over a wide frequency band can effectively dampen.
- Intake silencers will be able to be used in automotive internal combustion engines generated by turbocharger and loudly emitted noise in the To dampen the frequency band of around 2 - 6 kHz so that them both outside and inside the vehicle are practically imperceptible themselves.
- an intake silencer has of the type mentioned in the claim 1 mentioned features.
- the intake silencer according to the invention is accordingly constructed so that the intake air flows through the damper, in one Intake pipe that runs the entire axial length on the the damping is effected by a single, preferably double-shell resonator housing is surrounded.
- the intake pipe in a manner known per se Provide openings that the wall of the intake pipe push through open on both sides and the interior of the Intake pipe with the interior of the in the resonator housing trained resonator chambers connects.
- the wall thickness of the intake pipe is preferably in the range of 0.6 to 5 mm, especially in the Range between 1 to 3 mm inclusive.
- the wall thickness of the intake pipe or the inner wall height the opening in the wall of the intake pipe a matter of coordination between the cross-sectional area the opening, the volume of the connected Resonator chamber and the latitude and frequency range of the resonance absorption band to be set.
- the width of the active resonance absorption frequency band that can be set in this way increases with it decreasing cross-sectional area of the opening.
- the efficiency of the coupling ie the degree of damping that can be achieved must decrease the cross-sectional area of the opening initially between these two limit parameters can be optimized.
- the one punched through the resonator housing Intake pipe around the annulus is through aligned transversely to the axial course of the intake pipe Chamber walls in a sequence in the axial direction successive resonator chambers with each volume divided from each other.
- This Chamber walls are expediently on the resonator housing molded themselves and enclose as Inlet part formed intake pipe.
- the intake pipe is also firmly attached to the this enclosing chamber walls formed and in this form as an insert in the resonator housing be introduced. The only important thing is that the in thus formed resonator chambers hermetically are delimited from each other.
- the damping resonance band assigned to this primarily by dimensioning the chamber volume and by the wall thickness of the intake pipe wall in the area assigned to the respective chamber Match openings.
- the effective Frequency band becomes wider the smaller the Opening area will.
- the amount of damping also decreases, so that a compromise between the required Damping effect and the achievable broadband the damping of each chamber must be adjusted.
- the neighboring chamber so coordinated that the upper one, for example Frequency of the absorption band a chamber and the lower frequency of the absorption band of the neighboring chamber overlap sufficiently wide.
- the upper one for example Frequency of the absorption band a chamber and the lower frequency of the absorption band of the neighboring chamber overlap sufficiently wide.
- successive chambers so that whose volumes decrease steadily from one cell to the next or increases. This is supposed to mean that in a certain direction the resonator chamber volume the one immediately following in axial order Chambers is increasing steadily, from the first to the last chamber, and in reverse Accordingly, the direction decreases steadily.
- chamber to chamber is independent of the Direction in which the intake air the intake silencer flows through. In both cases, one becomes largely achieved the same acoustic damping.
- Intake silencers make that practical a damping frequency band without gaps in the range from 1 - 10 kHz.
- the intake pipe and the resonator of the intake silencer the invention can in principle can be made from any material.
- the suction line and Resonator housing also from the same material be made because the resonator housing shell practical has no radiation. Also don't need any additional damping materials to be used, to emit the noise from the resonator housing to prevent.
- the intake silencer the invention of heat-resistant, preferably fiber-reinforced plastic, hard rubber or made of porous sintered materials or porous materials, mainly made of aluminum.
- each individual resonator chamber For coupling the in each individual resonator chamber available air volume at the Sound pressure in the intake line and for which in the damping adjusting each resonator chamber Natural frequency and the width of their effective frequency band are, as shown, only the cross-sectional area of each opening, the number of Openings per chamber and the wall thickness of the intake pipe determinative.
- the geometric shape of each However, opening is basically without, at least without any noticeable influence on the characteristics of the intake silencer the invention. So they can individual resonator chambers with the inside of the intake pipe connecting openings both round, i.e. strictly speaking, be cylindrical, as well as oval, egg-shaped, be slit-shaped and polygonal. However, all openings of the intake pipe are preferably formed with a circular cross section. Such an embodiment of the intake silencer facilitates its tunability.
- the intake silencer When used in motor vehicles with superchargers the effect is practically flow-free working intake silencer preferably between the charger and the intercooler immediately switched on in the suction line.
- the intake silencer the invention in principle connect as close as possible to the loader's discharge nozzle, in particular to flange directly onto this or the shortest possible acoustically isolating Connect to this, or but, preferably, directly in the pressure port to integrate the turbocharger, for example in the from German patent DE 35 31 353 C2 for known the intake manifold of an intercooler Way.
- the intake silencer 1 shown in FIG. 1 for an internal combustion engine consists of an intake air in the throughflow leading intake pipe 2 and one this with the formation of a closed annulus 2 enclosing double-shell Resonator housing 4, wherein in Fig. 1 the better For the sake of clarity, only one of the two Housing shells that can be assembled to fit exactly are shown is.
- the intake silencer 1 is with an inlet port 5 and an outlet 6 to turn on equipped in the intake line of the internal combustion engine. It is for the purpose of better description the present invention, the inlet port 5 as shown in one piece with the intake pipe, while the outlet nozzle 6 as one piece with the illustrated Resonator housing shell shown connected is. This type of design of the connecting piece is basically interchangeable.
- both connecting pieces i.e. both Inlet connection as well as the outlet connection
- in one piece formed with the resonator housing in preferably the way that one of the two connecting pieces on one of the two resonator housing shells, the other on the other housing shell molded or otherwise formed with this are.
- This causes that in a two-shell design of the intake pipe as an insert in the resonator housing a preliminarily closing and Closing pressure for sealing purposes when closing of the resonator housing by welding, screwing or can be exercised otherwise.
- Each of these openings is circular in cross section trained, and has a wall thickness of Intake pipe 2 in the opening area of 2 mm Diameter of 3 mm.
- the openings 7 are arranged in the intake pipe 2 so that each of the resonator chambers 9 with the Inside the intake pipe 2 is connected, namely with the formation of a small oscillating air mass in the opening in such a way that none of the camera walls bridged, i.e. with one of the neighboring ones Chambers is short-circuited.
- Fig. 1 In the manner shown in Fig. 1 is the intake pipe within the resonator housing 4 with a oval cross-section, one of Inlet nozzle 5 through to outlet nozzle 6 continuously channel-like area of the intake pipe 2 none Has holes 7.
- This serves the purpose of using the intake air carried moisture, for example air humidity or oil dust when condensing in the intake pipe 2 not into the resonator chambers 9 through the To drain openings 7 through, but this Condensate without escaping into the resonator housing from the outlet port 6 of the intake silencer 1 let it run out (it should be noted that at the representation shown in Fig. 1, the spatial position the silencer 1 does not correspond to its installation position. This is after a rotation of that shown in Fig. 1 Intake silencer 1 by 90 ° clockwise obtained around the longitudinal axis of the intake pipe 2).
Description
Die Erfindung betrifft einen Ansaugschalldämpferfür eine Brennkraftmaschine der im Oberbegriff des Patentanspruchs 1 genannten Art sowie ein Kraftfahrzeug mit Brennkraftmaschine und Auflader mit einem Ansaugschalldämpfer.The invention relates to an intake silencer for an internal combustion engine in the preamble of claim 1 mentioned type and a motor vehicle with internal combustion engine and supercharger with one Intake silencer.
Ein Ansaugschalldämpfer der vorstehend genannten Art ist aus der deutschen Patentschrift DE 743 418 A bekannt. In der Figur 1 dieser Druckschrift ist eine unmittelbar hinter dem Einlassluftfilter angeordnete Schalldämpferkombination gezeigt, bei der das Ansaugrohr unmittelbar hinter der Staubfilterpatrone mit Wandungsöffnungen versehen und mit einem Dämmmaterial umgeben ist. In Strömungsrichtung hinter diesem Abschnitt ist das Ansaugrohr mit einer axialen Folge ringförmig angeordneter Lochreihen versehen. Jede dieser Lochreihen steht mit einer das Ansaugrohr aussen umgebenden Kammer in Verbindung. Durch glokkenförmige Hülsen werden die durch jeweils eine der Lochreihen hindurchtretenden Schallwellen aus der Ansaugluft so umgelenkt, dass sie der Luftströmung im Ansaugrohr entgegengesetzt verlaufend in die umgebende Kammer geleitet und auf deren radial ausgerichteten Boden gelenkt werden. Dabei wirkt dieser Kammerboden als Reflektor. Dadurch setzen die zur Eintrittslochreihe zurücklaufenden reflektierten Schallwellen den akustischen Leitwert der im Ansaugrohr ausgebildeten Öffnungen effektiv so weit herab, dass eine wirksam angekoppelte Ansauggeräuschdämpfung auch bei deutlich in den tieferen Frequenzbereich verlegten Frequnzen erzielt wird.An intake silencer of the above Art is from German patent DE 743 418 A known. In Figure 1 of this document is a located immediately behind the intake air filter Muffler combination shown in which the intake manifold immediately behind the dust filter cartridge Provide wall openings and with an insulation material is surrounded. In the direction of flow behind this Section is the intake pipe with an axial sequence provide rows of holes arranged in a ring. each this row of holes is the one with the intake pipe outside surrounding chamber in connection. By bell-shaped The pods are each one of the Sound waves from the intake air passing through rows of holes redirected so that the air flow in the intake pipe running in the opposite direction into the surrounding Chamber directed and on its radially aligned Ground to be steered. This chamber floor acts as a reflector. This sets them to the entry hole row returning reflected sound waves Acoustic conductance of those formed in the intake pipe Openings effectively so far down that an effectively coupled Intake noise reduction also at clearly frequencies placed in the lower frequency range is achieved.
Der aus der deutschen Patentschrift DE 743 418 A bekannte Stand der Technik lehrt also eine Ansauggeräuschdämpfung durch Resonanzankopplung an einen Reflexionsdämpfer. Dämpfer dieser Art sind nur für tiefe Frequenzen geeignet, beispielsweise zur Dämpfung von Motorpulsationen 2. Ordnung, weisen je Kammer nur eine einzige definierte Resonanzfrequenz auf, also kein auch noch so schmales sinnvoll nutzbares Frequenzband, und erfordern zudem einen grossen Bauraum, und zwar sowohl wegen der Struktur jeder einzelnen Reflektorkammer als auch wegen der Vielzahl der Reflektorkammern, die zur Erzielung einer zumindest mässigen Breitbandigkeit des Ansauggeräuschdämpfers erforderlich sind.The one from German patent DE 743 418 A known prior art thus teaches intake noise damping through resonance coupling to a reflection damper. Are dampers of this kind only suitable for low frequencies, for example for Damping of 2nd order motor pulsations, each have Chamber only a single defined resonance frequency on, that is, no matter how narrowly usable Frequency band, and also require a large one Construction space, both because of the structure of each individual reflector chamber as well because of the large number of the reflector chambers that are used to achieve at least one moderate broadness of the intake silencer required are.
Aus der deutschen Patentschrift DE 580 923 A ist ein auch als Ansauggeräuschdämpfer oder Geschossknalldämpfer ausgewiesener Abgasdämpfer für Brennkraftmaschinen bekannt, der als Einrohr-Resonanzdämpfer ausgebildet ist. Die die Resonanzwellenlänge im Abgasrohr festlegenden Bohrungen sind aufgrund des Überdrucks im Abgasrohr mit einem Aussenmantel umgeben. Dieser Mantel wirkt sich auf das Dämpfungsverhalten des Abgasgeräuschdämpfers beeinträchtigend aus.From German patent DE 580 923 A is also used as an intake silencer or bullet silencer Designated exhaust damper for Internal combustion engines known as the single-tube resonance damper is trained. The the resonance wavelength Bores defining in the exhaust pipe are due the excess pressure in the exhaust pipe with an outer jacket surround. This coat affects that Damping behavior of the exhaust silencer impairing out.
Ein weiterer Ansaugschalldämpfer ist aus der Druckschrift US 4 350 223 A bekannt. Dieser Ansaugschalldämpfer ist in eine flexible, aus einem Wellschlauch bestehende Leitung eingesetzt, die eine die Umgebungsluft ansaugende Öffnung in der Karrosserie des Kraftfahrzeugs mit dem Ansaugstutzen des Luftfilters verbindet. Dieser Ansaugschalldämpfer dämpft die im Einsaugbereich entstehenden Luftgeräusche innerhalb eines schmalen Frequenzbandes, das sich zu beiden Seiten der Resonanzfrequenz des Resonators ausdehnt.Another intake silencer is from the Publication US 4,350,223 A is known. This intake silencer is in a flexible, from a corrugated tube existing line used, the one the Ambient air intake opening in the body of the motor vehicle with the intake manifold of the air filter combines. This intake silencer dampens the Air noise within the intake area of a narrow frequency band that applies to both Extends sides of the resonance frequency of the resonator.
Einen in gleicher Weise aufgebauten Resonator sieht die technische Lehre der deutschen Offenlegungsschrift DE 32 34 634 A1 vor, der unmittelbar im Ansaugstutzen des Filters integriert ist. Zwei Reihen von Öffnungen verbinden den als Ansaugrohr des Ansaugschalldämpfers dienenden Ansaugstutzen des Filters mit dem Innenraum des umgebenden Resonators. Dabei sind diese beiden Reihen von Öffnungen so angeordnet, daß sie, bezogen auf die spezifische Eigenresonanzfrequenz des Ansaugstutzens eine λ/2- und λ/4-Dämpfung bewirken. Dadurch wird die Effektivität des Dämpfers verbessert, nicht aber seine Frequenzbreite.A resonator constructed in the same way sees the technical teaching of the German patent application DE 32 34 634 A1, which is directly in the Intake of the filter is integrated. Two rows of openings connect the as the intake pipe of the intake silencer serving intake of the filter with the interior of the surrounding resonator. These two rows of openings are arranged so that, based on the specific natural resonance frequency of the intake manifold a λ / 2 and λ / 4 damping cause. This will make the effectiveness of the Dampers improved, but not its frequency range.
Ein mit Dämmaterial "gestopfter" Ansaugschalldämpfer vergleichbarer Bauart integriert in den Ansaustutzen eines Ladeluftkühlers ist aus der deutschen Patentschrift DE 35 31 353 C2 für eine Brennkraftmaschine mit Auflader bekannt.An intake silencer "stuffed" with insulating material comparable design integrated into the Intake manifold of a charge air cooler is from the German Patent specification DE 35 31 353 C2 for an internal combustion engine known with charger.
Die Ansaugschalldämpfer des vorstehend beispielhaft dargestellten Standes der Technik zeigen insgesamt den Nachteil, nur innerhalb eines vergleichsweise schmalen Frequenzbandes brauchbar zu dämpfen. Zudem sind mit Dämmmaterial gestopfte Dämpfer nur für Anlagen geeignet, die einen nur mässigen Überdruck aufweisen. Für einen Einsatz in einer Laderansaugleitung sind mit Dämmstoffen gedämpfte Schalldämpfer unbrauchbar.The intake silencer of the example above shown prior art show overall the disadvantage, only within a comparative dampen narrow frequency band usable. In addition, dampers are stuffed with insulation material only suitable for systems with only moderate overpressure exhibit. For use in a charger intake line are silencers damped with insulation unusable.
Aus der internationalen Patentanmeldung WO 92/14922 A1 ist bekannt, einen breitbandig wirkenden Ansaugschalldämpfer durch Parallelschalten unterschiedlich langer gedeckter Seitenrohrresonatoren herzustellen. Obwohl diese Resonatoren zum Teil durch eine labyrinthartige Bauweise raumsparend ausgelegt sind, bleibt dieser Ansaugschalldämpfer doch noch immer so raumgreifend, daß er im Kraftfahrzeugbau praktisch nicht verwendbar ist.From the international patent application WO 92/14922 A1 is known to be a broadband Intake silencer different due to parallel connection to produce long covered side tube resonators. Although these resonators are partly controlled by a Labyrinthine design designed to save space are, this intake silencer still remains so extensive that it is practical in motor vehicle construction is not usable.
Um für Ansaugschalldämpfer einerseits eine effektive Breitbandigkeit herzustellen, andererseits aber eine ausladende Bauweise zu vermeiden, sind aus der europäischen Patentschrift EP 242 797 B1 für Diffusoren und aus der deutschen Offenlegungsschrift DE 41 43 408 A1 für einen Seitenzweigresonator durch Klappen und Ventile abstimmbare Dämpfersysteme bekannt, die nach Maßgabe der Motordrehzahl stellbar sind.To one hand for intake silencer to create effective broadband, on the other hand but to avoid a protruding construction are out European patent EP 242 797 B1 for diffusers and from the German patent application DE 41 43 408 A1 for a side branch resonator Flaps and valves tunable damper systems known which are adjustable according to the engine speed are.
Der Nachteil dieser Systeme besteht darin, daß trotz dem Erfordernis einer mehr oder minder aufwendigen Regelvorrichtung noch immer erheblich mehr Einbauraum benötigt wird als für die eingangs beschriebenen schmalbandigen Durchflußresonatoren. The disadvantage of these systems is that that despite the requirement of a more or less complex Control device still considerably more Installation space is required as for the initially described narrow-band flow resonators.
Diesem Stand der Ansaugschalldämpfung steht der zunehmende Druck des wachsenden öffentlichen Umweltbewußtseins gegenüber, das Kraftfahrzeuge mit einem deutlich geringeren Kraftstoffverbrauch fordert. Zur Verwirklichung dieses Ziels sind Auflader, und zwar hochwirksame Auflader, in Zukunft unvermeidbar.This level of intake sound attenuation stands the increasing pressure of the growing public Towards environmental awareness, the motor vehicles with a significantly lower fuel consumption calls. To achieve this goal, superchargers, and highly effective superchargers, inevitable in the future.
Die derzeit zu diesem Zweck eingesetzten Turbolader arbeiten zu diesem Zweck mit Rotor-Drehzahlen bis nahezu 200 000 min-1. Es ist verständlich, daß Turbolader mit einem derart hohen Anforderungsprofil nur mit Fertigungstoleranzkompromissen praxisnah wirtschaftlich bleiben können. Hierauf ist die starke akustische Abstrahlung solcher Turbolader, nämlich das typische "Turboladerpfeifen" im Frequenzbereich von rund 2 - 4 kHz, zurückzuführen. Dabei entstehen durch die Ladevorgänge selbst in der Ansaugleitung noch einmal im Frequenzband von 4 - 6 kHz liegende deutlich abstrahlende breitbandige Geräusche, die als "Fauchen" bezeichnet werden.The turbochargers are currently used for this purpose are working to this end with rotor speeds to nearly 200 000 min -1. It is understandable that turbochargers with such a high profile of requirements can only remain practically economical with compromises on manufacturing tolerances. This is the reason for the strong acoustic radiation of such turbochargers, namely the typical "turbocharger whistle" in the frequency range of around 2 - 4 kHz. The charging process, even in the intake line, once again produces clearly radiating broadband noises in the frequency band of 4 - 6 kHz, which are referred to as "hissing".
Dies bedeutet, daß umweltfreundlichere Kraftfahrzeuge in absehbarer Weise nicht ohne Breitband-Luftschallabsorber auskommen werden, die insbesondere zur Ansaugschalldämpfung in Kraftfahrzeugen mit Brennkraftmaschinen, die von einem Auflader aufgeladen werden, ein Frequenzband im Bereich von 2 - 6 kHz wirksam zu dämpfen vermögen.This means that more environmentally friendly motor vehicles in the foreseeable future not without broadband airborne sound absorbers will get along, in particular for intake sound absorption in motor vehicles with Internal combustion engines being charged by a supercharger a frequency band in the range of 2 - 6 kHz can effectively dampen.
Der Erfindung liegt dementsprechend die Aufgabe zugrunde, einen sicherlich auch anderweitig einsetzbaren Breitband-Luftschallabsorber, speziell jedoch einen Ansaugschalldämpfer für eine Brennkraftmaschine zu schaffen, der bei kleinstmöglichem undflexibel anpaßbarem Bauvolumen in flexibler Anpassung an die spezifischen Einsatzerfordernisse Luftschallgeräusche über ein breites Frequenzband gleichmäßig wirksam zu dämpfen vermag. Speziell soll ein solcher Ansaugschalldämpfer in der Lage sein, die bei Kraftfahrzeugbrennkraftmaschinen durch Turbolader erzeugten und lautstark abgestrahlen Störgeräusche im Frequenzband von rund 2 - 6 kHz so zu dämpfen, daß sie sowohl außerhalb des Fahrzeugs als auch im Fahrzeug selbst praktisch nicht mehr wahrnehmbar sind.The object of the invention is accordingly the basis, one that can also be used for other purposes Broadband airborne sound absorbers, but especially an intake silencer for an internal combustion engine to create the smallest possible and flexible adaptable construction volume with flexible adjustment to the specific application requirements for airborne noise evenly over a wide frequency band can effectively dampen. Such is specifically intended Intake silencers will be able to be used in automotive internal combustion engines generated by turbocharger and loudly emitted noise in the To dampen the frequency band of around 2 - 6 kHz so that them both outside and inside the vehicle are practically imperceptible themselves.
Zur Lösung dieser Aufgabe weist ein Ansaugschalldämpfer der eingangs genannten Art die im Patentanspruch 1 genannten Merkmale auf.To solve this problem, an intake silencer has of the type mentioned in the claim 1 mentioned features.
In einem Kraftfahrzeug mit Aufladung der
Brennkraftmaschine erzielt ein Ansaugschalldämpfer
dann die größte Wirkung, wenn er entsprechend der
Merkmale des Anspruchs 9, insbesondere der Merkmale
des Anspruchs 10, in den Ansaugkanal eingeschaltet
ist.In a motor vehicle with charging
Internal combustion engine achieves an intake silencer
then the greatest effect if it corresponds to the
Features of
Der Ansaugschalldämpfer gemäß der Erfindung ist dementsprechend so aufgebaut, daß die Ansaugluft den Dämpfer durchströmt, und zwar in einem Ansaugrohr, das über die gesamte axiale Länge, auf der die Dämpfung bewirkt wird, von einem einzigen, vorzugsweise zweischalig ausgebildeten Resonatorgehäuse umgeben ist. Innerhalb dieses Resonatorgehäuses ist das Ansaugrohr in an sich bekannter Weise mit Öffnungen versehen, die die Wand des Ansaugrohres beidseitig offen durchsetzen und den Innenraum des Ansaugrohres mit dem Innenraum der in dem Resonatorgehäuse ausgebildeten Resonatorkammern verbindet. Im Gegensatz zum Stand der Technik besteht das Ansaugrohr jedoch nicht aus einem lediglich mehr oder minder dünnen Stahlblech, sondern aus Werkstoffen wie beispielsweise Aluminium, Sintermetallen, Kunststoffen oder Hartgummi, die die Herstellung des Ansaugrohres auch mit grösseren Wandstärken ermöglichen, ohne dass dieses dadurch unbrauchbar schwer wird. Vorzugsweise liegt die Wandstärke des Ansaugrohres im Bereich von 0,6 bis 5 mm, insbesondere im Bereich zwischen 1 bis 3 mm einschliesslich. Im einzelnen ist die Wandstärke des Ansaugrohres, bzw. die Innenwandhöhe der Öffnung in der Wand des Ansaugrohres eine Frage der Abstimmung zwischen der Querschnittsfläche der Öffnung, dem Volumen der angeschlossenen Resonatorkammer und der Breite und Frequenzlage des einzustellenden Resonanzabsorbtionsbandes. Die Öffnung und die Resonatorkammer bilden also einen auf das zu dämpfende Frequenzband abgestimmten HELMHOLTZ-Resonator.The intake silencer according to the invention is accordingly constructed so that the intake air flows through the damper, in one Intake pipe that runs the entire axial length on the the damping is effected by a single, preferably double-shell resonator housing is surrounded. Within this resonator housing is the intake pipe in a manner known per se Provide openings that the wall of the intake pipe push through open on both sides and the interior of the Intake pipe with the interior of the in the resonator housing trained resonator chambers connects. In contrast to the prior art, this exists Intake pipe, however, not from just one more or less thin sheet steel, but from materials such as aluminum, sintered metals, plastics or hard rubber, which is the manufacture of the intake pipe enable even with larger wall thicknesses, without making it unusably difficult becomes. The wall thickness of the intake pipe is preferably in the range of 0.6 to 5 mm, especially in the Range between 1 to 3 mm inclusive. In detail is the wall thickness of the intake pipe or the inner wall height the opening in the wall of the intake pipe a matter of coordination between the cross-sectional area the opening, the volume of the connected Resonator chamber and the latitude and frequency range of the resonance absorption band to be set. Form the opening and the resonator chamber in other words, one that is tuned to the frequency band to be damped Helmholtz resonator.
Die Breite des so einstellbaren aktiven Resonanzabsorbtions-Frequenzbandes nimmt dabei zu mit abnehmender Querschnittsfläche der Öffnung. Da mit abnehmender Querschnittsfläche der Öffnung aber gleichzeitig auch der Wirkungsgrad der Ankopplung, also der Grad der erzielbaren Dämpfung abnimmt, muss die Querschnittsfläche der Öffnung zunächst zwischen diesen beiden Grenzparametern optimiert werden.The width of the active resonance absorption frequency band that can be set in this way increases with it decreasing cross-sectional area of the opening. In order to decreasing cross-sectional area of the opening, however at the same time the efficiency of the coupling, ie the degree of damping that can be achieved must decrease the cross-sectional area of the opening initially between these two limit parameters can be optimized.
Der durch das Resonatorgehäuse um das gelochte Ansaugrohr herzum gebildete Ringraum ist durch quer zum axialen Verlauf des Ansaugrohres ausgerichtete Kammerwände in eine Folge in axialer Richtung aufeinanderfolgender Resonatorkammern mit jeweils voneinander verschiedenem Volumen unterteilt. Diese Kammerwände sind zweckmäßigerweise am Resonatorgehäuse selbst angeformt und umschließen ein als Einlegeteil ausgebildetes Ansaugrohr. Alternativ kann jedoch ohne weiteres auch das Ansaugrohr fest mit den dieses umschließenden Kammerwänden ausgebildet und in dieser Form als Einlegeteil im Resonatorgehäuse eingebracht sein. Entscheidend ist lediglich, daß die in dieser Weise gebildeten Resonatorkammern hermetisch gegeneinander abgegrenzt sind. Dabei bedeutet "hermetisch gegeneinander abgegrenzt", daß die einzelnen Kammern pneumatisch und akustisch so gegeneinander abgegrenzt sind, daß die von ihnen umschlossenen Luftvolumina in leicht ankoppeln und nach dem Einschwingen ungestört ein stabiles Resonanzschwingverhalten aufrechterhalten können, also eine stabile Federkonstante aufweisen.The one punched through the resonator housing Intake pipe around the annulus is through aligned transversely to the axial course of the intake pipe Chamber walls in a sequence in the axial direction successive resonator chambers with each volume divided from each other. This Chamber walls are expediently on the resonator housing molded themselves and enclose as Inlet part formed intake pipe. Alternatively, you can however, the intake pipe is also firmly attached to the this enclosing chamber walls formed and in this form as an insert in the resonator housing be introduced. The only important thing is that the in thus formed resonator chambers hermetically are delimited from each other. Here means "hermetically delimited from each other" that the individual Chambers pneumatically and acoustically against each other are delimited that those enclosed by them Coupling air volumes in slightly and after Settling undisturbed stable resonance behavior can maintain, so one have a stable spring constant.
Zu beachten ist dabei, daß weder das Ansaugrohr, noch das Resonatorgehäuse eine lineare Längsachse aufzuweisen brauchen, koaxial ausgelegt zu sein brauchen oder gar rotationssymmetrisch ausgelegt sein müssen. Das Resonnanzverhalten jeder einzelnen Resonatorkammer ist letztendlich nur durch das schwingfähige Luftvolumen hinsichtlich seiner Resonanzfrequenz bestimmt, und nicht dadurch, daß alle Kamerwände parallel zueinander stehen, das Ansaugrohrzentral im Resonatorgehäuse verläuft oder gar die Kammerwände parallel zueinander angeordnet sind.It should be noted that neither the intake pipe, nor the resonator housing a linear longitudinal axis need to be coaxial need or even be designed to be rotationally symmetrical have to. The resonance behavior of each individual resonator chamber is ultimately only through the vibratable Air volume in terms of its resonance frequency determined, and not by the fact that all camera walls stand parallel to each other, the intake pipe central runs in the resonator housing or even the chamber walls are arranged parallel to each other.
Entscheidend ist weiterhin, daß der im Ansaugluftstrom auftretende Schalldruck durch die Öffnungen hindurch und über die in dem Öffnungsvolumen schwingende (und durch Wandreibung gedämpfte) Luftmasse auf jede der im Resonatorgehäuse ausgebildeten Kammern einwirken kann, und zwar auf jede dieser Kammern separat, ohne daß eine der Kammern durch eine der Öffnungen im Ansaugrohr über die Kammertrennwände hinweg zur Nachbarkammer überbrückt wird.It is also crucial that the intake air flow Sound pressure occurring through the openings through and over that in the opening volume vibrating (and dampened by wall friction) air mass on each of the trained in the resonator housing Chambers can act on each of these Chambers separately without passing one of the chambers one of the openings in the intake pipe via the chamber partitions bridged to the neighboring chamber becomes.
Aufgrund dieser Gegebenheiten läßt sich der Ansaugschalldämpfer der Erfindung bei kleinstmöglicher Baugröße praktisch jedem verfügbaren Einbauraum anpassen.Because of these conditions, the Intake silencer of the invention with the smallest possible Size practically every available installation space to adjust.
Für jede der einzelnen Resonatorkammem läßt sich das dieser zugeordnete dämpfende Resonanzband primär durch die Bemessung des Kammervolumens und durch die Wandstärke der Ansaugrohrwand im Bereich der der jeweiligen Kammer zugeordneten Öffnungen abstimmen. Für die dabei pro Kammer einstellbare Bandbreite gilt grundsätzlich, daß das wirksame Frequenzband umso breiter wird, je kleiner die Öffnungsfläche wird. Mit kleiner werdender Öffnungsfläche nimmt jedoch auch der Betrag der Dämpfung ab, so daß ein Kompromiß zwischen der erforderlichen Dämpfungswirkung und der erzielbaren Breitbandigkeit der Dämpfung jeder Kammer eingestellt werden muß.For each of the individual resonator chambers can the damping resonance band assigned to this primarily by dimensioning the chamber volume and by the wall thickness of the intake pipe wall in the area assigned to the respective chamber Match openings. For those per chamber adjustable bandwidth basically applies that the effective Frequency band becomes wider the smaller the Opening area will. With a smaller opening area however, the amount of damping also decreases, so that a compromise between the required Damping effect and the achievable broadband the damping of each chamber must be adjusted.
Um hierbei einen lückenlosen Breitband-Luftschallabsorber zu erhalten, wird dann die Nachbarkammer so abgestimmt, daß sich die beispielsweise obere Frequenz des Absorptionsbandes eine Kammer und die untere Frequenz des Absorptionsbandes der Nachbarkammer ausreichend breit überlappen. In diesem Zusammenhang hat es sich als vorteilhaft erwiesen, die aufeinanderfolgenden Kammern so auszulegen, daß deren Volumina von einer zur nächsten Zelle stetig abnimmt oder zunimmt. Dies soll bedeuten, daß in einer bestimmten Richtung das Resonatorkammervolumen der in axialer Folge unmittelbar aufeinanderfolgenden Kammern stetig zunimmt, und zwar durchgehend von der ersten bis zu letzten Kammer, und in umgekehrter Richtung dementsprechend stetig abnimmt. Dabei sind Zunahme und Abnahme der Kammervolumina von Kammer zu Kammer prinzipiell unabhängig von der Richtung, in der die Ansaugluft den Ansaugschalldämpfer durchströmt. In beiden Fällen wird eine weitgehend gleiche akustische Dämpfung erzielt.To create a complete broadband airborne sound absorber then the neighboring chamber so coordinated that the upper one, for example Frequency of the absorption band a chamber and the lower frequency of the absorption band of the neighboring chamber overlap sufficiently wide. In this context it has proven beneficial that successive chambers so that whose volumes decrease steadily from one cell to the next or increases. This is supposed to mean that in a certain direction the resonator chamber volume the one immediately following in axial order Chambers is increasing steadily, from the first to the last chamber, and in reverse Accordingly, the direction decreases steadily. Are there Increase and decrease in chamber volumes from In principle, chamber to chamber is independent of the Direction in which the intake air the intake silencer flows through. In both cases, one becomes largely achieved the same acoustic damping.
Auf diese Weise lassen sich beispielsweise auf einer Länge des Resonatorgehäuses von nicht einmal 30 cm und einer Folge von 5 bis 10 Kammern abgestimmte Ansaugschalldämpfer herstellen, die praktisch lückenlos ein Dämpfungsfrequenzband im Bereich von 1 - 10 kHz erfassen.In this way, for example on a length of the resonator housing of not even 30 cm and a sequence of 5 to 10 chambers Intake silencers make that practical a damping frequency band without gaps in the range from 1 - 10 kHz.
Das Ansaugrohr und der Resonator des Ansaugschalldämpfers der Erfindung können prinzipiell aus beliebigen Werkstoffen hergestellt werden. Dabei können im Gegensatz zu den bekannten einkammrigen Schmalband-Ansaugschalldämpfern beim Ansaugschalldämpfer der Erfindung die Ansaugleitung und das Resonatorgehäuse auch aus dem gleichen Werkstoff gefertigt werden, da die Resonatorgehäuseschale praktisch keine Abstrahlung aufweist. Auch brauchen keine zusätzlichen Dämpfungswerkstoffe verwendet zu werden, um ein Abstrahlen der Geräusche aus dem Resonatorgehäuse zu unterbinden.The intake pipe and the resonator of the intake silencer the invention can in principle can be made from any material. there can be in contrast to the known single-chamber Narrow-band intake silencers for intake silencers the invention, the suction line and Resonator housing also from the same material be made because the resonator housing shell practical has no radiation. Also don't need any additional damping materials to be used, to emit the noise from the resonator housing to prevent.
Vorzugsweise wird der Ansaugschalldämpfer der Erfindung aus wärmebeständigem, vorzugsweise faserverstärktem Kunststoff, aus Hartgummi oder auch aus porösen Sinterwerkstoffen oder porösen Werkstoffen, vor allem aus Aluminium, hergestellt.Preferably, the intake silencer the invention of heat-resistant, preferably fiber-reinforced plastic, hard rubber or made of porous sintered materials or porous materials, mainly made of aluminum.
Für die Ankopplung des in jeder einzelnen Resonatorkammer verfügbaren Luftvolumens an den Schalldruck in der Ansaugleitung und für die sich in der jeweiligen Resonatorkammer einstellende dämpfende Eigenfrequenz und der Breite ihres wirksamen Frequenzbandes sind, wie dargestellt, lediglich die Querschnittsfläche der einzelnen Öffnung, die Anzahl der Öffnungen je Kammer und die Wandstärke des Ansaugrohres bestimmend. Die geometrische Form der einzelnen Öffnung dagegen ist grundsätzlich ohne, zumindest ohne nennenswerten Einfluß auf die Kenndaten des Ansaugschalldämpfers der Erfindung. So können die die einzelnen Resonatorkammern mit dem Inneren des Ansaugrohres verbindenden Öffnungen sowohl rund, d.h. genau genommen zylindrisch, sein, als auch oval, eiförmig, schlitzförmig als auch vieleckig ausgebildet sein. Vorzugsweise sind jedoch sämtliche Öffnungen des Ansaugrohres mit kreisförmigem Querschnitt ausgebildet. Eine solche Ausgestaltung des Ansaugschalldämpfers erleichtert seine Abstimmbarkeit.For coupling the in each individual resonator chamber available air volume at the Sound pressure in the intake line and for which in the damping adjusting each resonator chamber Natural frequency and the width of their effective frequency band are, as shown, only the cross-sectional area of each opening, the number of Openings per chamber and the wall thickness of the intake pipe determinative. The geometric shape of each However, opening is basically without, at least without any noticeable influence on the characteristics of the intake silencer the invention. So they can individual resonator chambers with the inside of the intake pipe connecting openings both round, i.e. strictly speaking, be cylindrical, as well as oval, egg-shaped, be slit-shaped and polygonal. However, all openings of the intake pipe are preferably formed with a circular cross section. Such an embodiment of the intake silencer facilitates its tunability.
Beim Einsatz in Kraftfahrzeugen mit Aufladern ist der in seiner Wirkung praktisch strömungsverlustfrei arbeitende Ansaugschalldämpfer vorzugsweise zwischen dem Lader und dem Ladeluftkühler unmittelbar in die Ansaugleitung eingeschaltet. Dabei ist der Ansaugschalldämpfer der Erfindung weiterhin prinzipiell so dicht wie möglich am Druckstutzen des Laders anzuschließen, insbesondere unmittelbar an diesen anzuflanschen oder über eine möglichst kurze akustisch isolierende Verbindung an diesen anzuschließen, oder aber, vorzugsweise, unmittelbar in den Druckstutzen des Turboladers zu integrieren, beispielsweise in der aus der deutschen Patentschrift DE 35 31 353 C2 für den Ansaugstutzen eines Ladeluftkühlers bekannten Art und Weise.When used in motor vehicles with superchargers the effect is practically flow-free working intake silencer preferably between the charger and the intercooler immediately switched on in the suction line. Here is the intake silencer the invention in principle connect as close as possible to the loader's discharge nozzle, in particular to flange directly onto this or the shortest possible acoustically isolating Connect to this, or but, preferably, directly in the pressure port to integrate the turbocharger, for example in the from German patent DE 35 31 353 C2 for known the intake manifold of an intercooler Way.
Die Erfindugn ist im folgenden anhand eines Ausführungsbeispiels in Verbindung mit der Zeichnung näher erläutert. Dabei zeigt die einzige Figur, nämlich die
- Figur 1
- ein Ausführungsbeispiel der Erfindung in perspektivischer Darstellung und bei abgenommenem Deckel des Resonatorgehäuses.
- Figure 1
- an embodiment of the invention in perspective and with the cover of the resonator housing removed.
Der in Fig. 1 gezeigte Ansaugschalldämpfer 1
für eine Brennkraftmaschine besteht aus einem die Ansaugluft
im Durchstrom führenden Ansaugrohr 2 und einem
dieses unter Bildung eines geschlossenen Ringraumes
2 umschließenden zweischalig ausgebildeten
Resonatorgehäuse 4, wobei in der Fig. 1 der besseren
Übersichtlichkeit halber lediglich eine der beiden
paßgenau zusammenfügbaren Gehäuseschalen gezeigt
ist. Der Ansaugschalldämpfer 1 ist mit einem Einlaßstutzen
5 und einem Auslaßstutzen 6 zum Einschalten
in die Ansaugleitung der Brennkraftmaschine ausgerüstet.
Dabei ist zum Zwecke der besseren Beschreibung
der Erfindung vorliegend der Einlaßstutzen 5 als
einteilig mit dem Ansaugrohr ausgebildet dargestellt,
während der Auslaßstutzen 6 als einstückig mit der dargestellten
Resonatorgehäuseschale verbunden gezeigt
ist. Diese Art der Ausgestaltung der Anschlußstutzen ist
prinzipiell beliebig austauschbar. Vorzugsweise sind jedoch
beide Anschlußstutzen, also sowohl der
Einlaßstutzen als auch der Auslaßstutzen, einstückig
mit dem Resonatorgehäuse ausgebildet und zwar in
vorzugsweise der Weise, daß einer der beiden Anschlußstutzen
an einer der beiden Resonatorgehäuseschalen,
der andere an der jeweils anderen Gehäuseschale
angeformt oder anderweitig mit dieser ausgebildet
sind. Dies bewirkt, daß bei einer zweischaligen Ausgestaltung
des Ansaugrohres als Einlegteil in das Resonatorgehäuse
ein vorspannend schließender und
Dichtzwecken dienender Schließdruck beim Verschließen
des Resonatorgehäuses durch Schweißen, Verschrauben
oder anderweitig ausgeübt werden kann.The intake silencer 1 shown in FIG. 1
for an internal combustion engine consists of an intake air
in the throughflow leading
In der Rohrwand des Ansaugrohres 2 sind Öffnungen
7 ausgebildet, die das Innere des Ansaugrohres
2 mit dem Ringraum 3 des Resonatorgehäuses 4 verbinden.
Jede dieser Öffnungen ist im Querschnitt kreisförmig
ausgebildet, und hat bei einer Wandstärke des
Ansaugrohres 2 im Öffnungsbereich von 2 mm einen
Durchmesser von 3 mm.There are openings in the pipe wall of the
Quer zur Längsachse des Ansaugrohres 2
sind in jeder der beiden Halbschalen des Resonatorgehäuses
4 sich beim aufsetzenden Schließen des Gehäusedeckels
schließend ergänzende Kammerwände 8
ausgebildet, die bei geschlossenem Ansaugschalldämpfer
die äußere Oberfläche des Ansaugrohresss 2
dichtend umschließend. Auf diese Weise werden bei geschlossenem
Resonatorgehäuse im Resonator in axialer
Folge aufeinanderfolgend Resonatorkammern 9 gebildet,
die jeweils eine von der anderen abweichende
Volumina aufweisen. Dabei sind die einzelnen Kammervolumina
nicht nur durch die Abstände der Kammertrennwände
8 voneinander, sondern auch durch die
spezifische Gestaltung des Resonatorgehäuses 4
selbst bestimmt.Transverse to the longitudinal axis of the
Die Öffnungen 7 sind im Ansaugrohr 2 so angeordnet,
daß jede der Resonatorkammern 9 mit dem
Inneren des Ansaugrohress 2 verbunden ist, und zwar
unter Bildung einer kleinen schwingfähigen Luftmasse
in der Öffnung, in der Weise, daß dabei keine der Kamerwände
überbrückt, d.h. mit einer der benachbarten
Kammern kurzgeschlossen wird.The openings 7 are arranged in the
Wie in der Fig. 1 schematisch dargestellt, weisen
alle Öffnungen 7 des Ansaugrohres 2 die gleiche
geometrische Konfiguration und die gleichen Dimensionen
auf.As shown schematically in Fig. 1, point
all openings 7 of the
Im Idealfall sollten sowohl die Verteilung als
auch die Anzahl der im Ansaugrohr 2 pro Kammer 9 vorgesehene
Öffnungen 7 von Kammer zu Kammer identisch
sein. In der in Fig. 1 schematisch dargestellten
Weise wird sich dies in der Praxis jedoch nur selten verwirklichen
lassen, da auf Raumgestaltungen und Baugrößen
des Ansaugschalldämpfers in konstruktiver Hinsicht
Rücksicht zu nehmen ist.Ideally, both the distribution and
also the number provided in the
In der in Fig. 1 dargestellten Weise ist das Ansaugrohr
innerhalb des Resonatorgehäuses 4 mit einem
ovalen Querschnitt ausgebildet, wobei ein vom
Einlaßstutzen 5 bis zum Auslaßstutzen 6 durchgehender
rinnenartiger Bereich des Ansaugrohress 2 keine
Löcher 7 aufweist. Dies dient dem Zweck, mit der Ansaugluft
mitgeführte Feuchtigkeit, beispielsweise Luftfeuchtigkeit
oder Ölstaub, beim Kondensieren im Ansaugarohr
2 nicht in die Resonatorkammern 9 durch die
Öffnungen 7 hindurch abtropfen zu lassen, sondern dieses
Kondensat ohne Austritt in das Resonatorgehäuse
aus dem Auslaßstutzen 6 des Ansaugschalldämpfers 1
herauslaufen zu lassen (dabei ist zu beachten, daß bei
der in Fig. 1 gezeigten Darstellung die räumliche Lage
des Schalldämpfers 1 nicht seiner Einbaulage entspricht.
Diese wird nach einer Drehung des in Fig. 1 gezeigten
Ansaugschalldämpfers 1 um 90° im Uhrzeigersinn
um die Längsachse des Ansaugrohres 2 herum erhalten).In the manner shown in Fig. 1 is the intake pipe
within the resonator housing 4 with a
oval cross-section, one of
Claims (10)
- An intake silencer (1) for an internal combustion engine, consisting of an intake pipe (2) conducting the intake air and a resonator housing (4) enclosing the intake pipe formed as a closed annular space (3), comprising an inlet piece (5) and an outlet piece (6), having openings (7) in the pipe wall of the intake pipe (2) which connect the interior space of said intake pipe (2) with the interior space of the resonator housing (4), whereby one or an axial sequence of a plurality of chamber walls (8) being provided in the resonator housing (4) which are aligned transversely to the longitudinal axis of said intake pipe (2), and which enclose the latter and form resonator chambers (9) which are hermetically delimited with respect to each other and have different volumes, and comprising such an arrangement of the openings (7) in the pipe wall of the intake pipe (2) such that each of the resonator chambers (9) communicates with the interior space of the intake pipe (2) and in so doing, not bypassing any of the chamber walls, characterized in that
the openings (7) in the intake pipe (2) are arranged in such a way that under formation of air masses in the openings (7) that are small, vibratable and damped by wall friction, the acoustic pressure arising in the intake pipe (2) can act on each resonator chamber (9) separately, without bypassing a chamber (9) to an adjacent chamber (9), for each resonator chamber (9) via the wall thickness of the intake pipe (2) in the region of the respective openings (7) corresponding to the wall height of the respective openings (7) in dependence on the cross-sectional area of the respective openings and the volume of the resonator chamber (9) connected to the respective openings (7) the position and width of a resonance absorption band of the connected resonator chamber (9) are adjustable, wherein the wall thickness of the intake pipe (2) is in the range of 0,6 to 5 mm, and
the resonance absorption bands of adjacent resonator chambers (9) for providing a gapless broad band acoustic absorber with an absorption frequency band in the range of 1 to 10kHz overlap each other sufficiently broadly. - The intake silencer according to claim 1, characterized in that
the openings (7) in the pipe wall of the intake pipe (2) are of circular shape. - The intake silencer according to claim 1 or 2, characterized in that
the openings (7) in the pipe wall of the intake pipe are arranged such that each of the resonator chambers (9) communicates with the interior space of the intake pipe (2) via an equal number of openings. - The intake silencer according to any of claims 1 through 3,
characterized in that the intake pipe (2) is disposed with an oval or flattened oval cross-section. - The intake silencer according to any of claims 1 through 4, characterized in that
a wall sector in the base region of the intake pipe (2) is constructed so as to be continuous from the inlet piece (5) to the outlet piece (6) and without any openings, with respect to the specific fitting position of the intake pipe (2) in the intake silencer (1), and of the intake silencer in the internal combustion engine. - The intake silencer according to any of claims 1 through 5, characterized in that
the intake pipe (2) has a double shell construction with an axial parting plane, as well as in that a resonator housing (4) has a double shell construction with an axial parting plane. - The intake silencer according to any of claims 1 through 6, characterized in that
the intake pipe (2) is constructed so as to be an insert in the resonator housing (4). - The intake silencer according to any of claims 1 through 7, characterized in that
inlet and outlet pieces (6) are formed on the resonator housing. - A motor vehicle comprising an internal combustion engine, a supercharger, an air charge cooler and an intake silencer according to any of claims 1 through 8, characterized in that
a connection of the intake silencer (1) is provided between the supercharger and the air charge cooler. - The motor vehicle according to claim 9, characterized in that
the intake silencer (1) is connected directly behind, or to, or so as to be integrated with the pressure pipe joint of the supercharger.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19615917 | 1996-04-22 | ||
| DE19615917A DE19615917A1 (en) | 1996-04-22 | 1996-04-22 | Intake silencer and motor vehicle |
| PCT/EP1997/002038 WO1997040271A1 (en) | 1996-04-22 | 1997-04-22 | Intake silencer for motor vehicle |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0834011A1 EP0834011A1 (en) | 1998-04-08 |
| EP0834011B1 EP0834011B1 (en) | 2000-05-31 |
| EP0834011B2 true EP0834011B2 (en) | 2004-10-27 |
Family
ID=7792036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97920737A Expired - Lifetime EP0834011B2 (en) | 1996-04-22 | 1997-04-22 | Intake silencer for motor vehicle |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5979598A (en) |
| EP (1) | EP0834011B2 (en) |
| DE (2) | DE19615917A1 (en) |
| ES (1) | ES2146465T5 (en) |
| WO (1) | WO1997040271A1 (en) |
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| DE580923C (en) * | 1930-11-05 | 1933-07-19 | Gabriel Becker | Muffler for internal combustion engines through acoustic filters |
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| FR48791E (en) * | 1937-09-16 | 1938-06-23 | Muffler for internal combustion or combustion engine | |
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| DE3531353A1 (en) * | 1985-09-03 | 1987-03-12 | Audi Ag | Charge air cooler for supercharged internal combustion engine |
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| JP3528979B2 (en) * | 1994-08-24 | 2004-05-24 | 豊田合成株式会社 | Silencer |
| US5766713A (en) * | 1995-06-14 | 1998-06-16 | Exxon Chemical Patents Inc. | Elastomeric vehicle hoses |
-
1996
- 1996-04-22 DE DE19615917A patent/DE19615917A1/en not_active Withdrawn
-
1997
- 1997-04-22 EP EP97920737A patent/EP0834011B2/en not_active Expired - Lifetime
- 1997-04-22 ES ES97920737T patent/ES2146465T5/en not_active Expired - Lifetime
- 1997-04-22 US US08/983,024 patent/US5979598A/en not_active Expired - Lifetime
- 1997-04-22 WO PCT/EP1997/002038 patent/WO1997040271A1/en active IP Right Grant
- 1997-04-22 DE DE59701802T patent/DE59701802D1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2161424A1 (en) | 2008-09-04 | 2010-03-10 | WOCO Industrietechnik GmbH | Fluid transport device and sound absorber and exhaust gas facility with such a fluid transport device |
| DE102013220686A1 (en) | 2013-10-14 | 2015-04-16 | Mahle International Gmbh | intake silencer |
| DE202014007986U1 (en) * | 2014-10-01 | 2016-01-05 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | silencer |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59701802D1 (en) | 2000-07-06 |
| WO1997040271A1 (en) | 1997-10-30 |
| ES2146465T3 (en) | 2000-08-01 |
| US5979598A (en) | 1999-11-09 |
| ES2146465T5 (en) | 2005-04-16 |
| DE19615917A1 (en) | 1997-10-30 |
| EP0834011B1 (en) | 2000-05-31 |
| EP0834011A1 (en) | 1998-04-08 |
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