EP3728824A1

EP3728824A1 - Broad-band silencer for a motor vehicle engine

Info

Publication number: EP3728824A1
Application number: EP18829324.5A
Authority: EP
Inventors: Ralf Timme
Original assignee: Montaplast GmbH
Current assignee: Montaplast GmbH
Priority date: 2017-12-20
Filing date: 2018-12-18
Publication date: 2020-10-28
Anticipated expiration: 2038-12-18
Also published as: EP3728824B1; CN111512038A; DE102017130661A1; US20210293210A1; WO2019121744A1; US11434855B2; CN111512038B

Abstract

The invention relates to a broad-band resonance silencer having an at least two-part housing (2) which is designed to receive an exhaust- or gas-conveying pipe (4.1), which defines, with a circumferentially surrounding pipe jacket with acoustic openings formed therein, a pipe interior, wherein the pipe (4.1), in its installed position, is enclosed by a damping chamber formed by the housing, which chamber is actively connected to the pipe interior via the acoustic openings (4.2), and wherein the housing (2) comprises two axially split housing half-shells. In order to broaden the scope of use of such a broad-band resonance silencer, it is proposed that the pipe be designed as an insert (4) which comprises a central pipe section with two end-side pipe ends, that the insert (4) be designed such that it can be inserted into the housing half-shells of the housing, and that the broad-band resonance silencer comprise at least one acoustic channel (4,5, 4.6, 4.13, 4.15, 4.20).

Description

Broadband damper for a motor vehicle engine

The invention relates to a broadband resonant muffler, which is referred to simply referred to as broad band damper, in particular installed in an internal combustion engine, particularly preferably a motor vehicle, with an at least two-part housing, comprising in particular a Gehäuseun terschale and a housing upper shell. The housing has a damper longitudinal axis and a damper transverse axis and receives an exhaust gas or gas-carrying pipe, which köffnungen defines a pipe interior with a umumfang Lich surrounding pipe jacket with formed therein Akusti. The tube forming an air duct is in installation position of at least one formed by the housing damping or resonance chamber to closed, which is in operative connection via the acoustic openings with the Rohrin nenraum, and wherein the housing comprises two axially divided housing parts or is formed from these.

The vehicles, which are becoming ever quieter, also pose a great challenge to engine technology, in particular to their sound-intensive systems, of which the air intake system of the engine or of a turbocharger of the same is particularly affected. In order to minimize the noise in an air intake system, resonators are often used today. A resonator generally consists of one or more chambers that are gas-permeably connected to an air intake line. To realize the efficient noise reduction In order to cover a broad resonance spectrum, a plurality of resonators may be provided in different configurations that compensate for different resonance ranges.

Since the parts of the intake system are often produced today drive in Spritzgussver, developers are increasingly facing the problem of how several resonator chambers can be provided optimized in a confined space.

Existing broadband resonant mufflers are mainly ausgebil det as multi-part systems or assemblies that are welded together and, for example. outer housing parts include, are welded into the pipe segments with openings. Striking in all existing solutions is the complexity of the shape and the connection technology, so that these systems are often welded in multiple parts who need. This is manufacturing technology relatively compli ed and prone to errors. The realized from the prior art complexity increases the production cost and thus the cost. Broadband resonance muffler with divided by a plurality of partition walls resonance chambers or Resonator ren require a relatively large amount of space and sometimes have only a small effective resonance volume. In these multi-part constructions more Schweißvor courses are required regularly. Nested designs require intermediate assembly steps in the welding process, which is also detrimental to manufacturing costs. It is also difficult to form different types and configurations of resonators in a broadband resonant muffler, while providing a variety of Varian th in a tight space.

The housing with the tube arranged therein in the installation position form a damping system in the intermediate space between the inside tube and the outside housing extends along a system longitudinal axis or the Dämpferlängsach se, but which axis does not necessarily have to run along a straight line, but may also be curved or curved. The individual damping chambers or Resonanzkam numbers are usually radially outgoing from the tube spaced apart from each other along the damper longitudinal extension Rich tion of the overall system or the Dämpfungssys system formed so formed.

Such resonators are e.g. from DE 10 2010 022 780 B4 and EP 1 176 355 A2.

Disadvantages of the prior art

Although such broadband resonant mufflers already allow a far-reaching absorption of the unwanted noise over a wide frequency spectrum, further possibilities are sought to use them for even broader appli cation areas.

Technical problem (task)

Based on the above-mentioned prior art and the associated disadvantages, the invention is therefore based on the object to avoid the disadvantages mentioned at least partially and in particular a silencer or broadband resonance muffler for an internal combustion engine provide, the rum around a particularly wide Anwendungsspekt allows or provides for many frequencies, wel cher claimed in a complicated geometry as small as possible space and is easy to produce.

invention

This object is already solved by the features of inde- gene claims; preferred but not mandatory developments are set forth in the subclaims. In the simplest embodiment, the tube is designed as Rohrein sentence body, ie as a preferably integrally formed unit which comprises the pipe or pipe socket or a tubular element which is ge in the housing parts in Einbaula insertable, wherein the tube comprises acoustic openings in the pipe jacket surface and wherein the pipe insert body further comprises end-side connections for connection to adjacent pipes, pipes or the like and at least one Akus tikkanal. The at least one or each acoustic channel has in each case at least one or exactly one channel inlet opening through which the fluid or gas flows into it and is closed at the end, thus eg as lambda / 4-channel or lambda / 2-channel to act.

Preferably, the housing comprises two parts, namely a first housing half-shell, in particular formed as a housing seunterschale, and a second housin which can be placed on this sehalbschale, which is in particular formed as a housing upper shell.

According to an alternative, the damping chamber is subdivided into at least two resonance chambers via at least one insert web, wherein the at least one insert web is integrally formed on the insert body, and wherein the insert web additionally acts as a positional fixing means. According to a second alternative, which is particularly preferably in combination with the first alternative imple light, the at least one acoustic channel comprises an input opening, which opens directly into the tube. The insert web and / or at least the channel inlet of the acoustic channel are thus also part of the preferably einstücki gene Rohrinsatzköpers. Preferably, at least Teilbe are rich of at least one or more acoustic channels parts of the preferably one-piece tube insert body. At least partial regions of the at least one are particularly preferred or more acoustic channels part of preferably einstücki gene tube insert body and / or one or more complete acoustic channels are part of the preferably one-piece Rohein sentence body. If, with respect to a given acoustic channel, only a partial area of the same part of the preferably one-piece tube insert body, so the other portion of the respective acoustic channel to complete this, preferably formed by the housing or one of the housing parts. The respective "partial area" of the acoustic channel is in each case a wall area of the acoustic channel, including the wall area closing the channel entrance opening. As a result, the broadband resonance muffler structurally particularly simple and particularly easy to manufacture, namely by using the Rohrinsatzköpers in one of the housing parts and closing or assembling the preferably 2-part housing.At the same time, the broadband resonance muffler on improved sound attenuation, since this a broadband resonator and at the same time includes acoustic channels for additional and particularly effective attenuation special Fre frequencies, both damping functions are integrated into the pipe insert body.

The invention thus provides a solution to the problem, in addition to the broadband damping by means of at least one or more damping chambers compensation for at least one or different frequencies through the at least one or more acoustic channels of different lengths and different geometries in a particularly small space before watching Thus, to compensate or catch at least one or more addi tional frequency ranges in the one or more different frequencies corresponding to the frequencies Acoustic channels, wherein the concrete geometric design of an acoustic channel or multiple acoustic channels, for example, in length and diameter can be determined by the skilled person adapted to compensate for generating frequencies. Thus, noise can be compensated cal in an arbitrarily large frequency range by appropriate design of the acoustic channel or multiple acoustic channels, in addition to the broadband attenuation. Preferred frequency ranges are between 200 to 800 Hz, but other frequency ranges are quite within the range of the possible. Thus, for example, a certain Akustikka channel for the range of 200 Hz, one at this subsequent sequent or separate acoustic channel for the frequency range of 300 Hz and another acoustic channel for the Frequenzbe range from 400 to 600 Hz or even up to 800 Hz ausgestal be. According to the invention, the acoustic channels, if meh rere provided, so different lengths and Geomet rien to intercept or compensate for the different frequency ranges.

The damping chamber can be subdivided by at least one insert web into a plurality of damping chambers or subchambers, which are arranged, for example, extending one behind the other along the damper longitudinal axis. The respective insert web thus acts as a partition to separate the adjacent Dämpfungskam numbers from each other. The separation of Dämpfungskam numbers through the respective insert web is at least substantially gas-tight, wherein a low leakage rate with respect to a gas exchange between adjacent damping chambers is acceptable, provided that the noise-dampening de function of the respective damping chamber is not significantly affected. The respective web is preference, as attached to the Rohrinsatzköper or especially before given to integrally formed on this. The formed as an air guide system broadband resonant muffler thus has two essential constituent parts, namely the outside or receiving housing and the usable in this tube insert body. The pipe insert body comprises the pipe, which carries the fluid or the air from a damper input side to a damper output side. Particularly preferably, the broadband resonance muffler comprising the further at least one acoustic channel and insert webs for the separation of the Resonatorkam chambers from just the housing shells and the tube insert body, whereby the broadband resonance muffler is particularly easy to produce. Furthermore, this broadband resonance muffler for a given design of the housing to different requirements of the sound attenuation is adaptable bar, for example different interpretations of a turbo charger, just by different arrangement of Einsatzste ge and / or different embodiments of at least one or more acoustic channels.

Generally in the context of the invention, the housing can thus consist of more than two housing part shells, the sake of clarity sake half the term "housing shell part" and the term "housing half shell" is used. However, in particular, the term "housing half-shell" in each case refers to a two-part housing with two housing half-shells.

The thus preferably two-piece housing is preferably formed cup-shaped and preferably comprises a housing lower shell and a housing upper shell, the separating point in the installation position are connected to each other at a separation or connectable, for example, are weldable, which extends vorzugswei se along the damper longitudinal axis.

The tube insert body with the at least one, with its longitudinal extension direction transverse to the damper longitudinal axis Erstre- ckenden insert web and at least the sub-areas of at least one or more acoustic channels is preferably integrally formed, which is particularly advantageous in terms of production technology and handling during assembly of the broadband resonance muffler. Optionally, the raw insert body may also be formed in several parts, provided that the individual part of the same areas are joined together to form a contiguous group of components, so that the tubular insert body can be handled as a component and inserted into the housing shell, so that then mating with the second housing shell of Broadband resonance muffler can be produced.

Preferably, the housing parts or housing shells are in

Made by injection molding and connected by welding you tend or gas-tight. Can be used in the housing and recorded tube insert body with the air duct or tube is open at both ends and has a necessary for the media flow cross-section.

According to the invention, the volume or interior of the housing formed between the housing and the pipe or air duct forms the broadband resonator, which can also be designed as a "Helmholtz resonator" which can comprise a plurality of subchambers or resonance chambers for compensating or covering the widest possible frequency spectrum , which is divided by provided on the insert body insert webs or insert walls. The necessary for the function waterproofing device between the so preferably in the longitudinal direction hinerei nander formed resonance chambers can be realized for example by a tongue and groove connection. Preferably, at least one groove is formed on the inside of the housing, in which the at least one insert web, which acts as a partition wall between the resonator, can be inserted. The at least one acoustic channel forms a further rohrför Miges resonant volume, which may be formed for example as a quarter-wave resonator.

The acoustic channel is preferably at least partially or completely formed by at least one channel wall formed on the outside of the tube, which is preferably part of the tube insert body. The acoustic channel is preferably each directly from the pipe.

Preferably, the channel wall of the acoustic channel is arranged on the outside of the tube insert body and preferably integrally formed on the tube insert body.

The channel wall may extend in the damper longitudinal direction with respect to the channel length direction, whereby the channel length may vary over larger areas and thus cover individual frequencies of a larger frequency spectrum. The channel wall can also extend transversely to the damper longitudinal direction with respect to the channel longitudinal direction, whereby the Geomet theory of the channel extension varies over larger areas who can. Particularly preferably, the at least one Akus tikkanal a extending with its longitudinal extent in the direction of the damper longitudinal axis portion and extending along with its longitudinal extension along the damper transverse axis portion, so that the channel length and thus the frequency detected by the channel selected from a wide frequency range Fre and the damper can be adapted to different requirements.

It is also possible that the acoustic channel at least partially spaced from the pipe jacket to form a gap between the channel and pipe he stretches. As a result, the geometry of the longitudinal extension of the channel is practically freely selectable and the channel length can vary widely and to the respective requirements be adjusted.

The tube of the tube insert body has several Akustiköffnun conditions, wherein each of a plurality of Akus tiköffnungen can be provided on the tube to a damping chamber. The Dämp combustion chamber is formed in each case between the tube and the housing, wherein adjacent damping chambers are separated from each other by the insert webs. With respect to a respective damping chamber a plurality of Akusti köffnungen are provided on the tube (preferably more than two), which are distributed around the pipe circumference and / or a plurality of acoustic openings (preferably more than two), which are arranged spaced apart in the longitudinal direction of the tube , The number and / or size of the acoustic openings, ie their length, width and diameter, are individually matched to the desired frequency ranges to be damped for each chamber.

To exploit the entire volume of the damping chamber, the at least one acoustic channel may also extend over a plurality of resonant chambers, wherein it may have any desired geometries.

Preferably, the at least one acoustic channel extends along the damper longitudinal axis and / or along the damper transverse axis, in particular in the edge region in the vicinity or adjacent to the surrounding housing. Preferably, the acoustic channel extends circumferentially along the edge of the tube insert body, thus substantially forms at a distance from the edge contour of the tube insert body. However, it is fundamentally within the scope of the invention that the at least one acoustic channel has any desired geometry for the particular application, e.g. For particularly long acoustic channels, the geometry of a worm or spiral.

In a preferred embodiment, the acoustic cable comprises at least one radially outwardly of the tube insert body. formed channel wall, channel rib or the like, in particular integrally formed on this, which is connectable in installation position with the adjacent housing part to form the Akus tikkanals, in particular by means of a dense Ver bond to close the acoustic channel. This connection preferably takes place by means of gluing, welding or the like. In this way, the tube insert body only has to be inserted into the one housing shell by positioning the dividing wall and then sealed with the second housing shell. The tube insert body is thereby particularly easy to manufacture, especially as injection molded component, in particular as a one-piece component. The channel wall can on the inside also engage in a correspondingly formed receiving groove on the inside of the housing.

Embodiments include that the channel wall can be additionally welded for sealing.

By a plurality, in particular parallel side by side de channel walls can be provided so easily in the given space a corresponding plurality of acoustic channels or resonator channels.

The at least one or the respective acoustic channels or resonator channels each have at least one or exactly one channel opening or channel inlet opening through which an air flow or sound wave can enter the respective channel from the tube, and is / are in each case at the channel opposite end closed at the end.

Different lengths of these acoustic channels and different Liche geometric design thus allow Kompensa tion of different frequency spectrums. As particularly expedient moderately, the formation of the channel opening has been identified as a slot, with the input opening in principle corresponds to the cross section of the acoustic channel. In general, the cross section and length of the acoustic channel are adapted to the frequency to be compensated. The acoustic channels may be formed, for example, as ¼ (quarter-wave) channel or resonator or one ½ (half-wave) channel or resonator. In a l / 4-channel, the acoustic channel k of the wavelength to be damped, so that the passage of a sound wave to the channel end and back l / 4 results and thus by superimposing the waves ge concerned in the pipe is attenuated. Since the covered sound frequencies depend on the respective length of the acoustic channel, the acoustic channels thus formed can have different lengths.

Preferably, the outer acoustic channels, which thus extend closer to the housing wall, formed larger, so have a greater length, because they are relatively further away from the tube of the insert body.

Embodiments include the formation of the acoustic channel adjacent to the outer surface of the tube, but also spaced from this outer lateral surface, so that they do not lie directly against the tube surface müs sen.

The embodiment of the invention offers a particular advantage of weight and cost savings and a wesent Liche simplification of the manufacturing process. Due to the design of the tube with the various channels and Rip pen as a tube insert body a particularly simple Monta ge is realized, which also realizes the placement of several re sonatoren with different functions in a simple system unit or module.

The broadband resonant muffler according to the invention is preferably made of plastic and is preferably produced by injection molding in the injection, so formed as a multi-part injection molded part. The broadband resonant sound absorber comprises a plurality, preferably two to form an interior with each other at a joint connectable housing parts, in particular formed as housing half shells tion in Systemquerrich, ie radially separable and between them the gasfüh-generating tube with an inlet and an outlet end includes the front ends and a plurality of acoustic openings in the pipe jacket.

The at least one acoustic channel is formed by a between the outer surface of the tubular insert body and this in mounting position receiving or a captive housing formed, in particular continuous channel wall, which is preferably integrally formed on the outside of the tube insert body as a projecting web, ie in the installed position is closed by the inner surface or wall of the housing.

Preferably, the at least one channel wall is formed on the tube insert body, e.g. integrally formed on this. However, it is also within the scope of the invention that the design is reversed, so the channel wall is formed on the inner circumferential surface of the housing or the housing parts, which then rests in the installed position on the outer surface of the tube insert body and thus defines the surrounding Akus tikkanal.

For imaging or compensation of various resonance surfaces, embodiments comprise a plurality of such channel walls which are offset from one another at intervals on the outer surface between the tubular insert body and the housing and which thus act for different resonance ranges. These acoustic channels thus formed by the channel walls thus form further individual acoustic chambers, which can therefore be configured as desired for the noises to be influenced or for the oscillations to be compensated. Embodiments comprise at least one arranged in the acoustic channel or the acoustic channels partition or channel partition wall or boundary walls, which may limitie ren the channel length be to compensate for certain frequencies. This channel separation or boundary walls can also be formed later inserted, for example in the form of a tongue and groove connection between the two joining partners.

To extend the resonance spectrum to be processed, embodiments provide different acoustic channels in different planes, which may be connected to each other via a connecting channel, e.g. in the damper longitudinal direction under or superimposed trained acoustic channels.

Embodiments provide for the acoustic channels to be formed at different levels in height offset from the central longitudinal axis of the damping system, preferably designed as circumferential closed damping or acoustic channels. For the purposes of the invention, the damping system consists of housing and tube insert body.

The individual acoustic channels preferably extend essentially transversely to the longitudinal direction of extension of the system and are preferably formed circumferentially, for example, substantially in a plane extending on the tube insert body, but individual acoustic channels may be formed on the tube insert body on different levels. Thus, for example, a first, and thus in the installed position upper acoustic channel formed on the upper side of the pipe insert body acoustics anal, which opens via a particular transverse to the system longitudinally downwardly extending connecting channel in a second, lower acoustic channel, which, for example, circumferentially formed on the outer edge of the tube insert body is. To extend the geometrical design options in the narrow available space, an acoustic channel may also comprise a blind hole which extends vertically downwards or upwards or from a first acoustic channel to a second acoustic channel offset in height relative to this first acoustic channel, wherein the water preferably extends substantially transversely to the longitudinal direction.

This blind hole can function as a connecting channel between two acoustic duct sections or acoustic duct sections, which are e.g. are formed on different levels in the broad band resonator. A still further differentiation or frequency absorption in a small space can be achieved if an acoustic channel or another acoustic channel is formed in at least one terminal region of a pipe end. Preferably, this acoustic channel is designed as a circular annular space, which is particularly preferably formed in or on a pipe connection of the broadband resonance muffler. This pipe connection is particularly preferably integrally formed on the housing ausgebil det.

Embodiments provide between the joining partners, so the insert body and the housing trained Lagefixierungsmit tel before, for example in the form of insert webs on a joining partner, which engage in installation position in the inside grooves on the corres ding other joining partners and which thus a more accurate positioning of the insert body in the hous ensure. The webs may be formed, for example in the form of plates which are fixed to the insert body, preferably integrally formed on this before. By the position fixing means between insert web and housing and vibrations of the webs in the operation of the damper are avoided the. Generally, the insert bars close at least in the sentlichen gas-tight with the inside of the housing from. The "one building position", as also generally within the scope of the invention, refers in each case to the position of the respective component in the ready-to-use broadband resonance muffler.

The broadband resonance muffler preferably comprises a pipe connection which is provided in the direction of flow, and a pipe connection which has an outlet side in the flow direction for connection to the media-carrying lines. Preferably, these pipe connections are formed on the housing, namely as an annular connection piece, on which the connection pipes can be placed.

At the flow-side inlet end of an acoustic channel, inlet openings may be formed in the tube lateral surface of the insert body. The respective acoustic channel has at its input end thus an inlet opening, which is formed in the tube lateral surface of the tube of the insert body. The acoustic channel thus in each case directly adjoins the tube of the tube insert body. The acoustic channel thus goes with its channel wall directly from the pipe. The at least one or more input openings may in particular be designed as special slots and are preferably adapted to the size of the acoustic channel, that is about as large as the cross section of the associated acoustic channel.

The respective acoustic channel is designed to be closed at its end opposite the inlet opening, so that the sound wave entering the channel is reflected back into the tube at the channel end. The channel is thus formed in the manner of a lambda / 4-Knals. The acoustic channel thus has in each case over its entire length a closed and non-refractory side wall, which is so at least in We sentlichen or virtually completely gas-tight, except for the inlet opening of the channel. If the channel wall is formed by two components, for example the tube insert body. per and the housing or a housing part, these construction parts are at least substantially gas-tight joined together, particularly preferably welded.

Embodiments provide to divide an acoustic channel by at least one transverse to the longitudinal axis of this acoustic channel he stretching partition into two acoustic channel sections. Preferably, these partitions for particularly simple adaptation to the particular application, ie for easy adaptation of the length of the acoustic channel at various locations with the acoustic channel connectable used, for. can be used to compensate for different frequencies.

The broadband resonant muffler according to the invention is preferably arranged between a turbocharger and an air filter housing of an internal combustion engine in order to compensate for unwanted resonances.

In addition, the invention relates to an internal combustion engine with a previously described broadband resonance muffler.

In the following detailed description, reference is made to the accompanying drawings, which form part of this He-making description and in which illustrative Chung specific embodiments are shown, with which the invention can be practiced. In this regard, directional terminology such as "top", "bottom", "front", "back", "front", "rear", etc. is used with respect to the orientations of the figure (s) described. Because components of embodiments can be positioned in a number of different orientations, the directional terminology is illustrative and is in no way limiting. It is understood that other embodiments may be used and structural or logical changes may be made without departing from the scope of the deviate from the present invention. The following detailed description is not to be construed in a limiting sense.

In this description, the terms "connected," "connected," and "integrated" are used to describe both direct and indirect connection, direct or indirect connection, and direct or indirect integration provide similar elements with identical reference numerals, as far as this is appropriate.

Reference lines are lines connecting the reference to the part concerned. On the other hand, an arrow that does not touch any part refers to an entire entity to which it is directed. Incidentally, the figures are not necessarily to scale. To illustrate details, it is possible that certain areas may be exaggerated in size. In addition, the drawings can be bold simplistic and do not contain every detail in the practical execution. The terms "top" and "bottom" refer to the illustration in the figures. Show it:

Fig. 1 is an exploded isometric view in the

Longitudinal view of the broadband resonance muffler according to the invention;

FIG. 2 is an isometric top view of the broadband

Resonance muffler with removed upper half-shell;

FIG. 3 shows a longitudinal section of the broadband resonance muffler according to FIG. 2;

FIG. 4 shows an enlarged view of the right-hand input end of the broadband resonance muffler in FIGS. Figure 5 is an isometric frontal cross section of the input end of the broadband resonant muffler;

FIG. 6 shows the broadband resonance muffler according to FIG. 1 in the installed position with the upper half shell removed to illustrate the main acoustic channel;

FIG. 7 shows the illustration according to FIG. 6 with dividing walls inserted into the main acoustic channel; and

Figure 8 shows the illustration of an alternative embodiment form of the broadband resonance muffler formed at different levels acoustic channels.

Accordingly, the broadband resonant muffler We sentlichen designed as a plastic injection molded part, two-piece housing 2 formed for insertion or pickup men of the tube insert body 4. Optionally, the housing may also consist of more than two half shells.

The broadband resonant muffler comprises in the present embodiment, a two-part housing 2, which has a damper longitudinal axis and a damper transverse axis, a received in the housing exhaust or gas-carrying pipe 4.1, which defines a pipe interior with a circumferentially surrounding pipe jacket with therein formed acoustic openings, wherein the tube 4.1 is umschlos sen in the installed position of at least one damping chamber formed by the housing, which is in operative connection via the acoustic openings 4.2 with the pipe interior. The housing 2 comprises vorlie two housing parts formed as two Gehäusehalbscha len 2.1, 2.4. According to the invention, the tube 4.1 is formed in all embodiments as a tube insert body 4, which comprises a central tube section with two end-side tubes. The insert body 4 is designed to be usable in the housing parts of the housing and the broadband resonance muffler has at least one acoustic channel 2.6, 4.5, 4.6, 4.13, 4.15, 4.20. In addition, the damping chamber is divided over at least one insert web 4.3 in at least two resonance chambers and the at least one A record web 4.3 is integrally formed on the insert body 4 with this. The insert bar 4.3 also acts as Lagefixie medium. Finally, the at least one acoustic channel comprises an inlet opening (4.11, 4.12), which is formed in the pipe insert body.

The housing 2 comprises a substantially trough-shaped housing lower shell 2.1 with a central receiving area for receiving the tubular insert 4, in which the Rohrein sentence body 4 is so used that the frontal pipe ends of the tube 4.1 of the pipe insert body 4 with the nozzle-shaped and integrally formed pipe connections 2.2, 2.3 complete the housing lower shell 2.1.

The lower housing shell 2.1 is sealed media-tight about a roof-shaped ausgebil finished housing upper shell 2.4, including the housing lower shell 2.1 in the outer edge region umlau fende, closed Einstecknut 2.5, in which in the installed position a complementary trained sealing web on the upper housing shell 2.4 media-tight.

The tube insert body 4 thus comprises a central, extending along the longitudinal axis of the tube 4.1, which comprises an outer tube shell surface in which a plurality of Akusti köffnungen 4.2 (only one provided with a reference numeral) circumferentially distributed are formed at different locations.

Furthermore, the tube insert body 4 comprises at the lower end in the longitudinal direction spaced apart and extending transversely to the Sys temlängsrichtung, radially projecting insert webs 4.3 (only one designated by reference numeral), which in mounting position in the inside of the housing lower shell provided 2.1 NEN Einstecknuten 2.5 (only one designated by reference numeral) can be inserted. Thus, it is ensured that the Rohrein set body 4 is fixed in position in the housing 2 in the desired position, so because the insert webs 4.3 position fixation in the insertion grooves 2.5 and thus also the ends of the pipe 4.1 of the pipe insert body 4 with the inside of the pipe connections 2.2, 2.3 complete the housing inner shell 2.1 media-leading.

In general, however, only such an insert web can be vorgese hen, so that the damper thus has only two damper chambers.

According to Figures 1 and 2, two acoustic channels 4.5, 4.6 are formed on the upper side of the tube body, namely an outer acoustic channel 4.5 and an inner acoustic channel 4.6, the gebil det by integrally projecting on the outside of the tube 4.1 of the tubular insert body 4 channel walls 4.7 Be that the distance to the outer edge of the tube insert body 4 so circumferentially erstre bridges along the edge, that thus between these and the surrounding housing 2 radially spaced from each other, the circumferential acoustic channels 4.5, 4.6 are formed, which in the present case have about the same porridge te, of which the inner acoustic channel but accordingly is shorter.

In general, however, only one acoustic channel can be provided or more than two.

In addition to the actual acoustic openings 4.2, the pipe insert body 4 thus comprises openings in the figures on the right side proximal input end formed as slots 2.7 4.11, 4.12 for the acoustic channels through which the medium from the pipe interior in the respective acoustic channel 4.5, 4.6 enter and from this can also escape. As can be seen in particular from the enlarged illustrations of the pipe connection 2.2 in Figures 4 and 5, can be formed in pipe connections 2.2, 2.3 circumferentially encircling acoustic channels 2.6, which therefore has a pipe connection 2.2. Form circumferentially surrounding annular space, which is formed on the inside by the pipe connection 2.2, in which a likewise designed as a slot 2.7 inlet opening is provided, and the outside by a ring attachment 6, the snaps on the pipe connections 2.3, 2.4 so snaps in that between the ring attachment 6 and the pipe connection 2.2, 2.3 around the pipe connections 2.2, 2.3 further acoustic channels can be formed.

An inserted into this acoustic channel 2.6 and extending transversely to the longitudinal direction of the acoustic channel partition 2.8 limits the length of the acoustic channel 2.6.

In the alternative embodiment according to FIG. 6, only one circumferential acoustic channel 4.13 is formed on the tube insert body 4, said channel being formed by a circumferential channel wall 4.14.

In the further embodiment according to FIG. 7, only one circumferential acoustic channel 4.15 is likewise formed on the outer jacket surface of the tube insert body 4. This is ever but formed in two parts and includes two Eingangsöffnun conditions in the form of slots 4.16, 4.17, which are separated by a once eckbare partition 4.18 at the input end and separated by another partition 4.19 at the end of voneinan. In this way, the lower in the figure 7 acoustic channel section of the acoustic channel 4.15 but only about half as long as the upper in the Figure 7 acoustic channel section of the acoustic channel 4.15. By repositioning the partition wall 4.19 at different locations of this Rohrinsatzkör can be 4 easily adapted to different frequency ranges. Finally, FIG. 8 shows an isometric plan view of one embodiment of a broadband resonance muffler with an acoustic channel 4.20, which is partially formed on two levels and in turn comprises a plurality of acoustic channel subsections. The visible in the figure 8 upper levels of the two acoustic channel sections each have an associated, formed as a slot 4.21, 4.22 inlet opening and a partition wall arranged therebetween 4.23. These Akustikka nalteilabschnitte are in turn limited by the two sections ending partition 4.24.

In addition, this embodiment comprises a schematically hinted tetes, vertically so transverse to the longitudinal direction extending blind hole 4.25, which is an extension to compensate for other frequencies. This blind hole can be fluidly connected in a further embodiment with an underlying, hidden acoustic channel section, which made further design options for frequency compensation on extremely limited space made light.

The object of the present invention results not only from the subject of the individual claims, but from the combination of the individual claims untereinan of. All in the documents - including the summary - disclosed disclosures and features, in particular the illustrated in the drawings spatial training are claimed as essential to the invention, as far as they are individually or in combination over the prior art.

Broadband damper for a motor vehicle engine

LIST OF REFERENCE NUMBERS

2 housings

2.1 housing lower shell

2.2, 2.3 Pipe connection

2.4 Housing top shell

2.5 insertion groove

2.6 Acoustic channel

2.7 slot

2.8 Partition

4 tube inserts

4.1 pipe

4.2 Acoustic opening

4.3 Insert bar

4.5 outer acoustic channel

4.6 inner acoustic channel

4.7, 4.8 channel wall

4.11, 4.12 entrance opening

4.13 Acoustic channel

4.14 canal wall

4.15 Acoustic channel

4.16, 4.17 slot channel separation wall

Acoustic channel slot

partition wall

blind

ring tower

Claims

Broadband damper for a motor vehicle engine claims

1. Broadband attenuator or broadband resonance

muffler having at least two divided housing (2) defining a damper longitudinal axis and a damper transverse axis, an exhaust gas or gas-carrying pipe (4.1) accommodated in the housing, which defines a pipe interior with a circumferentially surrounding pipe jacket with acoustic openings formed therein, the pipe (4.1) is enclosed in the installed position of at least one damper chamber formed by the housing, which is in operative connection via the acoustic openings (4.2) with the pipe interior, wherein the housing (2) at least two housing parts, in particular two ge divided housing half-shells (2.1, 2.4 ),

CHARACTERIZED,

(i) that the tube (4.1) is designed as a tube insert body (4) which has a central tube section with two end tube ends,

(Ii) that the tube insert body (4) in the housing parts of the housing (2) is insertable,

(iii) that the broadband resonance muffler comprises at least one acoustic channel (2.6, 4.5, 4.6, 4.13, 4.15, 4.20), (iv) that the damping chamber is subdivided into at least two resonance chambers via at least one insert web (4.3)

(v) that the at least one insert web (4.3) on the insert body (4) is formed integrally therewith,

(vi) that the insert web (4.3) also acts as Lagefi xierungsmittel the pipe insert body in relation to the housing, and / or

(vii) that the at least one acoustic channel comprises an inlet opening (4.11, 4.12) formed in the tube insert body.

2. Wide-band resonance muffler according to claim 1, characterized in that the acoustic channel

(4.11, 4.12) extends with its longitudinal extent at least partially in the direction of the damper longitudinal axis.

3. Wide-band resonant muffler according to claim 1 or 2, characterized in that the Akustikka signal (4.11, 4.12) extends with its longitudinal extent at least in sections along the damper transverse axis.

4. broadband resonant muffler according to one of claims to 1 to 3, characterized in that the acoustic channel (4.11, 4.12) is arranged in a portion of its longitudinal and / or transverse extent at a distance from the pipe jacket.

5. broadband resonance muffler according to any one of claims 1 to 4, characterized in that the acoustic channel (4.11, 4.12) is arranged in a portion of its longitudinal and / or transverse extent to the Gehäusein- nenwandung.

6. broadband resonance silencer according to one of claims to 1 to 5, characterized in that the at least one acoustic channel extends in the peripheral region in the vicinity of or adjacent to the surrounding de housing.

7. broadband resonance silencer according to one of claims to 1 to 6, characterized in that the acoustic channel has a the input port gegenüberlie ing end, which is formed at least substantially closed.

8. broadband resonant muffler according to one of claims to 1 to 7, characterized in that the acoustic channel (4.11, 4.12) extends in the direction of the damper longitudinal axis over a plurality of damping chambers he stretches.

9. broadband resonant muffler according to claim 8, characterized in that the acoustic channel to at least one insert web (4.3) of the insert body passes through and is preferably integrally formed on the A record web.

10. broadband resonance muffler according to one of claims to 1 to 9, characterized in that at least one channel wall portion of the acoustic channel (4.5, 4.6) by a portion of the tube insert body (4) and / or a portion of the housing (2) is formed ,

11. Wide-band resonance muffler according to one of claims to 1 to 10, characterized in that the acoustic channel is at least a portion of the same part of the insert body.

12. Broadband resonance muffler according to one of the Proverbs 1 to 11, characterized in that the channel wall of the acoustic channel (4.7, 4.8) is formed with a partial area on the insert body and with a portion of the housing on the housing (2), wherein both portions together form the respec gene acoustic channel.

13. broadband resonance muffler according to one of the foregoing claims, characterized in that the at least one channel wall (4.7, 4.8) is formed circumferentially on the tube insert body (4).

14. Wide-band resonance silencer according to one of the preceding claims, characterized in that a further acoustic channel (4.5, 4.6) at least one pipe connection (2.2, 2.3) is formed.

15. Wide-band resonance muffler according to one of the preceding claims, characterized in that the input opening (4.11, 4.12) or channel opening is larger than the remaining acoustic openings.

16. Wide-band resonant muffler according to claim 15, characterized in that the inlet opening (4.11, 4.12) or channel opening and the cross section of the acoustic channel substantially the same geomet Rie, in particular have the same cross-section.

17. Wide-band resonance muffler according to one of the preceding claims, characterized in that the acoustic channel (4.5, 4.6) comprises a channel partition wall (4.18, 4.19, 4.23, 4.24).

18. Wide-band resonance muffler according to one of the preceding claims, characterized That a channel partition (4.18, 4.19, 4.23, 4.24) can be inserted into the acoustic channel.

19. Wide-band resonance muffler according to claim 18, characterized in that the channel partition wall (2.8, 4.23, 4.24) is designed to be insertable at various locations in the acoustic channel (4.5, 4.6).

20. engine or turbocharger of an internal combustion engine with broadband resonance muffler according to one of claims to 1 to 18 in the air duct system, insbesonde re air intake system, such.