EP2757235A1 - Sound muffler and method for producing the same - Google Patents

Abstract

The silencer (1) has first housing section (4) and second housing section (5) having shells which overlap at least in parts. In the overlapping region (6), a shell exterior face of first housing section (4a) rests against a shell interior face of second housing section (5b), and shell exterior face of first housing section and shell interior face of second housing section each have a constant cross-section as seen in axial direction, at least in overlapping region. The housing sections include the recesses (21,22) in which a flow duct (2), e.g., pipe, extends through. An independent claim is also included for a method for manufacturing the silencer.

Description

The invention relates to a silencer, in particular vehicle silencer, comprising a tube forming a flow channel and a first resonator chamber and a second resonator chamber, each surrounding the tube and arranged one behind the other in the axial direction, wherein the tube in its jacket at least a first opening, the in the first resonator chamber opens, and at least one second opening, which opens into the second resonator, has. The invention also relates to a vehicle with a silencer and a method for producing a silencer.

Such a silencer discloses the EP 1400662 B1 , This document discloses two, in the axial direction one behind the other arranged resonator chambers, which are separated by a perforated plate from the flow channel. The trained in the nature of a Helmholtz resonator muffler is consuming and expensive to manufacture. For the production of silencers with different resonator volumes also different parts must be made and provided depending on the application. As a result, flexibility of the manufacturing process is low.

The WO 07101412 A1 discloses a silencer in modular design and its manufacture. For this purpose, a plurality of fluid guide elements is provided, which form a labyrinth of passages and resonator chambers. A continuous pipe is not provided, construction and construction are very complex and require a large number of individual parts whose composition is extremely complex.

The DE 736633 A discloses a multi-chamber muffler in which the gases flow in the jacket of the muffler. In each case, two chambers are connected by an annular space. The inner tube is not continuous, but empties coming from one side with a first tube fitting in a middle chamber. From there, the fluid flows through radial openings in an annular space, where it is diverted and fed into another chamber. In this further chamber protrudes the second pipe connection piece of the muffler. This construction is far from the silencer mentioned above and requires their assembly a relatively large number of individual parts, which not only must be precisely positioned but also supported in order to obtain sufficient stability.

The DE 10 2008 015353 A1 discloses a charging device, in particular an exhaust gas turbocharger for a motor vehicle with a sound absorber based on the principle of a resonance absorber for reducing the sound generated by the charging device. In this case forms a housing of the charging device together with an insert the silencer. The muffler is thus an integral part of the charging device. The insert formed from plastic may be bolted to the housing of the charger. A continuous exhaust pipe is not provided. This solution is only suitable for special applications and must be exactly adapted to the design of the charging device.

The WO 12052548 A2 discloses a broadband damper for charge air ducts of a turbocharged internal combustion engine. This solution does not contain a continuous tube, but discloses successively arranged, each separated by an annular gap pipe sections, wherein the gaps connect the interior of the fluid line with the outside arranged resonance chambers. This is a very special solution, but is complicated to manufacture due to its construction and requires a variety of components. In addition, the mechanical stability is low.

The DE 10 2010 020064 A1 discloses a muffler assembly for a particular supercharged automotive internal combustion engine. This comprises a housing in which a flow channel is formed, wherein outside of the flow channel a resonator chamber is arranged. The muffler assembly also forms a coupling between a hose section and an exhaust gas turbocharger. In this case, two housing parts are interlocked, wherein the mutually contacting surfaces are formed cone-shaped and lie in the predetermined position to each other. Design and manufacture of such a construction is complex and limited to a given resonator volume. If different resonance conditions have to be created for certain applications, it is necessary to dimension the components differently from the ground up. This requires additional effort already in the prefabrication of the individual parts.

Finally, the show JP 2008082306 A , the DE 19957597 B4 , the DE 4219249 A1 and the DE 3020492 C2 Silencer constructions, however, which are still different from the present invention.

A major disadvantage of the known silencer or the manufacturing method is that for the production of silencers with different resonator volumes, the required components must be adapted to the respective resonator volume. This means that depending on the desired resonator volume, individually dimensioned components must be used. This already requires an increased effort on both prefabrication of the components. When assembling these components must be considered individually. These requirements also adversely affect the cost of the muffler.

The aim of the present invention is to provide a silencer and a manufacturing method in which these disadvantages do not occur and in which the production of different silencers with different resonator volumes requires no additional effort in the prefabrication of the components and their composition. Reliable, mechanically stable and efficiently damping mufflers should be producible with the invention.

This object is achieved with a silencer mentioned above in that the resonator chambers are formed by a first housing part and a second housing part, each having a jacket formed around an axis, wherein in the axial direction, the length of the shell of the one housing part at least half of Length of the shell of the other housing part is, and that the housing parts are pushed together and their coats overlap at least partially, wherein in the overlapping region, the outer shell side of the first housing part abuts the inner shell side of the second housing part and the outer shell side of the first housing part and the inner shell side of the second housing part at least in the overlapping region each have a cross-section which is invariable in the axial direction, and in that the housing parts each have a recess through which the flow channel extends.

The advantage of such a design is that the housing parts can be pushed into each other differently in production depending on the desired resonator volume. The housing parts are - before they are attached to each other, e.g. be welded - telescopically, wherein the lateral surfaces in the different telescoping positions in the overlapping area abut each other.

The feature according to which the outer shell side of the first housing part and the inner shell side of the second housing part have at least in the overlap region in each case an unchangeable in the axial direction cross-section or cross-sectional contour, allows telescoping during assembly with constantly abutting lateral surfaces. The cross section in question is normal to the axial direction.

Only when the correct relative position of the housing parts is achieved by sliding into each other, the attachment of the housing parts takes place. Thus, a high degree of flexibility is achieved without the need to produce different sized housing parts for different resonator volumes.

Typically, the (provided for the pipe or the flow channel) recesses are arranged on the side facing away from the overlap region of the respective housing part.

Preferably, the tube is formed continuously at least in the area surrounded by the resonator chambers and passes through the recesses of the housing parts. This allows a particularly simple production of a few parts.

Alternatively, the inner tube may also consist of two parts, which are pushed together and thereby form a continuous flow channel.

Preferably, the outer shell side of the first housing part and the inner shell side of the second housing part in each case in their predominant areas on an invariable in the axial direction cross-section. This allows not only a simple construction but also a maximum telescoping during production and thus a resonator volume variation to a great extent.

Preferably, the housing parts are each cylindrical in shape and have the outer shell side of the first housing part and the shell inner side of the second housing part in each case circular cross-section. This allows for the production of a simple telescoping, which can be helped by the occurrence of resistances by slightly twisting the housing parts.

Preferably, the shells of the housing parts, at least in the overlapping region, preferably continuously, in each case one in the axial direction invariable shell thickness. As a result, the shells or the entire housing parts can be made of sheets of constant thickness, resulting in a favorable weight reduction.

In the axial direction, the length of the jacket of one housing part is preferably at least two-thirds, preferably three-quarters, of the length of the jacket of the other housing part, the coats of the housing parts particularly preferably having substantially the same length. As a result, the maximum possible extent in which the housing parts can be pushed into one another during manufacture becomes large, which ensures maximum flexibility with regard to the resonator volume during the production process.

Preferably, the housing parts in each case on the side facing away from the overlap region on an end wall, in which the recesses are formed for the passage of the tube or the flow channel. The end walls define the resonator chambers in the axial direction and provide with their recesses a connection to the pipe.

Preferably, the housing parts are each sealingly connected in the region of their recesses with the tube airtight to the outside. There is thus no additional coating or outer skin required, the tightness creates, the housing parts limit the resonator directly to the outside.

Preferably, the housing parts are welded together in their overlap region. This is an easy-to-accomplish measure and ensures not only mechanical stability but also an airtight seal. As an alternative, a non-positive connection, for example by clamps, would be possible.

Preferably, the jacket of one housing part and the jacket of the other housing part each form part of the outer wall of the muffler. This represents a space and material-saving solution, since no further outer skin is needed.

Preferably, the housing parts seal the resonator chambers to the outside airtight. This feature also aims at reliability, simplicity and space savings.

Preferably, in the overlap region outer jacket (the second housing part) at its edge on a flanging on. The flanging or everting facilitates the insertion of the first housing part in the second housing part. In addition, the flanging on the housing part also provides protection against injury. As a result, very thin sheets can be used. The stability is also increased by this measure.

Preferably located in one of the housing parts a partition, which separates the resonator from each other, wherein the partition wall has a recess for the passage of the tube or the flow channel. The partition wall is attached to the housing part and may already be present in the prefabricated housing part, so that no further measures for the separation of the resonator chambers are required during assembly.

Preferably, the housing parts are clamped between two profiles, each sitting on a running outside the resonator chambers pipe section. These pipe sections can each be designed as a (one-piece) part of the pipe running inside the resonator chambers or be fastened as a separate pipe section in each case on the inner pipe. As a result, not only an attachment to the tube, but also a correct positioning, which ensures that the first openings open into the first resonator and the second openings in the second resonator chamber. In addition, the profiles can also be used simultaneously as connection profiles for a hose or a connecting pipe.

Preferably, the housing parts are made of sheet metal, preferably stainless steel sheet. Preferably, the housing part is formed as a deep-drawn pot. Such a measure allows a weight saving when using thin wall thickness without compromising stability.

The tube is preferably formed in the region surrounded by the resonator chambers from a first tube part and a second tube part, which are pushed into one another in their end regions, the first housing part surrounding the first tube part and the second housing part surrounding the second tube section. As a result, the inner running pipe can be mitgebildet during mating of the housing parts, whereby the manufacturing process is even easier.

Preferably, at least one of the tube parts is integrally formed with the surrounding housing part, preferably from a deep-drawn piece of sheet metal. This measure reduces the required components and ensures high mechanical stability. With a deep-drawing process, the one-piece part is equipped with two functionalities, namely the housing functionality and design of the flow channel.

Preferably, the one-piece part forms a projection which rests against a pipe section extending at least partially outside the resonator chambers and is held from the outside by a profile, preferably a spring clip, so that the projection is arranged in the radial direction between the pipe section and the profile. This facilitates the assembly and the fixation of the individual components.

Preferably, the partition with one of the tube parts, preferably with the tube part pushed over the other tube part, integrally formed, preferably from a deep-drawn piece of sheet metal, whereby the muffler and its manufacture can be further simplified.

Preferably, in the overlapping region, at least one circumferential sealing ring is inserted between the outer shell side of the first housing part and the inner shell side of the second housing part. If the two components are not welded, a positive connection can be sealed reliably with the help of an ORing. Preferably, in the jacket of the first housing part and / or in the jacket of the second housing part, an annular recess for the sealing ring is formed, wherein preferably the receptacle is formed by an arcuate course of the shell. As a result, the sealing ring remains fixed during telescoping (adjustment of the resonator volume).

The aim is also achieved with a vehicle, in particular road-bound vehicle, with a muffler, in particular a turbocharger muffler, which is arranged on the pressure side of a turbocharger, wherein the muffler is designed according to one of the embodiments described above. Preferably, the muffler is a turbocharger muffler, which is arranged on the pressure side of a turbocharger. The turbocharger silencer serves to reduce noise emissions on the pressure side of the turbocharger. The muffler can be plugged onto a short pressure hose directly at the outlet of the turbocharger and e.g. be secured with a spring band clamp.

The object is also achieved with a method for producing a silencer, comprising a tube forming a flow channel and a first resonator chamber and a second resonator chamber, each surrounding the tube and arranged one behind the other in the axial direction, the tube in its jacket at least a first opening opening into the first resonator chamber and at least one second opening opening into the second resonator chamber. The method is characterized in that for the formation of the resonator chambers, a first housing part and a second housing part, each having a recess for the flow channel and each having a jacket formed around an axis and telescopically slidable along the axis are provided, wherein in axial direction, the length of the shell of the one housing part is at least half the length of the shell of the other housing part and wherein the shell outside of the first housing part in the different telescoping positions on the shell inner side of the second housing part, and that the prefabricated housing parts to form the resonator and be telescoped to adjust a certain resonator volume of a resonator chamber to a corresponding extent telescopically.

As already mentioned, the great advantage of the invention is that the muffler is formed from originally separate housing parts, which are telescopically telescoping to a great extent. For this purpose, the jacket lengths of the housing parts are dimensioned accordingly (shell length of a housing part is at least half of the shell length of the other housing part). By the continuous tube on which the housing parts are supported in the assembled state of the muffler or on which they rest, it is ensured that only a few components are required for the muffler.

In order to achieve a specific resonator volume of a resonator chamber, only the first housing part needs to be pushed to the desired extent into the second housing part. The abutting lateral surfaces already form a kind of positive connection that can be reliably sealed by a non-positive connection or by welding.

For another application or according to customer requirements, a different resonator volume may be required. In contrast to the prior art, it is not necessary according to the invention to provide differently dimensioned components. Rather, the same housing parts can be used. Only the extent to which the housing parts are pushed into one another differs from the other application. Thus, standard and therefore inexpensive manufactured (same) housing parts can be used for the formation of different resonator volumes.

Preferably, the tube is formed continuously and the housing parts are pushed over the tube, so that the tube passes through the recesses of the housing parts, resulting in a reliable and easy to manufacture construction.

Preferably, after the resonator volume of a resonator chamber has been adjusted, the housing parts are welded together by telescoping the housing parts in their overlapping area, whereby a reliable and airtight connection is achieved.

Preferably, the prefabricated housing parts in each case on the side facing away from the overlap region on an end wall, which have a corresponding outer diameter of the tube recess, and the housing parts are pushed over the tube, so the at least one first opening opens into the first resonator chamber and the at least one second opening opens into the second resonator chamber.

Preferably, the housing parts are prefabricated as cup-shaped parts having a recess for the pipe in its bottom. This can be done for example by deep drawing.

Preferably, one of the housing parts is provided with a partition which, in the assembled state, separates the first resonator chamber from the second resonator chamber. The partition can be prefabricated with the relevant housing part, so that only an assembly of the individual components must be made. The position of the partition wall in the housing part determines the volume of the other resonator chamber. The partition may be in the form of a separate part, e.g. be used as an annular wall with a beaded edge at the desired location in the housing part and connected thereto, e.g. be welded.

The tube is preferably formed in the region surrounded by the resonator chambers from a first tube part and a second tube part, which are pushed into one another in their end regions, the first housing part surrounding the first tube part and the second housing part surrounding the second tube section.

Preferably, at least one of the tube parts is integrally formed with the surrounding housing part, preferably by deep drawing a piece of sheet metal.

At least one circumferential sealing ring between the outer shell side of the first housing part and the inner shell side of the second housing part is preferably used in the overlapping region.

The invention thus makes it possible to provide a silencer modular system for producing a silencer, with a tube having in its jacket at least a first opening and at least one second opening, which is axially spaced from the first opening, as well as with a first housing part and a second housing part, each having a recess for the passage of the tube or the flow channel, wherein the Housing parts are telescopically slidable into each other, so that their coats overlap at least partially, wherein in the overlapping region, the outer shell side of the first housing part abuts the shell inner side of the second housing part, and wherein the housing parts are slidable over the tube, so that the tube passes through the recesses.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Fig. 1

einen erfindungsgemäßen Schalldämpfer;

Fig. 2

einen ersten und einen zweiten Gehäuseteil vor dem Zusammenfügen;

Fig. 3

die Gehäuseteile aus Fig. 2 im zusammengesetzten Zustand;

Fig. 4

die Gehäuseteile aus Fig. 2 im zusammengesetzten Zustand, wobei ein im Vergleich zu Fig. 3 kleineres Resonatorvolumen der ersten Resonatorkammer ausgebildet ist;

Fig. 5

ein Fahrzeug mit erfindungsgemäßem Turbolader-Schalldämpfer;

Fig. 6

eine Variante eines erfindungsgemäßen Schalldämpfers im Querschnitt;

Fig. 7

den Schalldämpfer aus Fig. 6 in perspektivischer Ansicht.

Each shows in a highly schematically simplified representation:

Fig. 1

a silencer according to the invention;

Fig. 2

a first and a second housing part prior to assembly;

Fig. 3

the housing parts Fig. 2 in the assembled state;

Fig. 4

the housing parts Fig. 2 in the assembled state, with one compared to Fig. 3 smaller resonator volume of the first resonator chamber is formed;

Fig. 5

a vehicle with inventive turbocharger muffler;

Fig. 6

a variant of a silencer according to the invention in cross section;

Fig. 7

the silencer off Fig. 6 in perspective view.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the position information selected in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to a new position analogous to the new situation. Furthermore, you can too Represent individual features or combinations of features from the illustrated and described different embodiments of their own, inventive or inventive solutions.

The embodiments show possible embodiments of the muffler and its manufacturing process, it being noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but also various combinations of the individual embodiments are mutually possible and this variation possibility due to the teaching of the technical Acting by objective invention in the skill of those working in this technical field is the expert. So are all conceivable embodiments, which are possible by combinations of individual details of the illustrated and described embodiment variant, includes the scope of protection.

For the sake of order, it should finally be pointed out that, for a better understanding of the structure of the muffler, this or its components have been shown partially out of scale and / or enlarged and / or reduced in size.

The task underlying the independent inventive solutions can be taken from the description.

Fig. 1 shows a silencer 1 according to the invention, which is formed from a continuous tube 2 and two, the tube 2 surrounding resonator 14, 15. The tube 2 is a flow channel, ie in it the medium between the input and the output of the muffler 1 is guided. In the case of a silencer, which is connected downstream of a turbocharger, the guided medium is compressed air. The tube 2 extends continuously between a first tube section 11 and a second tube section 12. The first and second tube sections 11, 12 extend on both sides outside (or at least partially outside) of the resonator chambers 14, 15 and form the inlet and the outlet of the muffler 1.

In the jacket 3 of the tube 2 are first circumferentially distributed openings 7, which open into the first resonator 14, and second circumferentially distributed openings 8, which in the second resonator 15 open, formed. The first openings 7 and the second openings 8 are different in size. The volumes of the two resonator chambers 14, 15 have different sizes. The resonator chambers 14, 15 are formed by a first housing part 4 and by a second housing part 5. The housing parts 4, 5 are pushed into each other, so that the shells of the housing parts 4, 5 overlap in an overlap region 6. The overlapping jacket sections abut each other. The outer shell side 4a of the first housing part 4 rests against the inner shell side 5b of the second housing part 5. Preferably, the shells of the housing parts 4, 5 are welded together in the overlap region 6, so that the resonator chambers 14, 15 are sealed airtight to the outside.

In the second housing part 5 is additionally seated a partition wall 20 which separates the resonator chambers 14, 15 from each other and thereby creates independent volumes. The partition wall 20 is formed as an annular wall with a flanged outer edge, which is welded to the shell inner side 5b, and with a flanged inner edge, which lies loosely on the outside of the tube 2 or is also welded there, formed.

The housing parts 4, 5 are cylindrical, wherein they each have an end face 9,10, which faces away from the overlap region 6. In the end faces 9, 10 recesses 21, 22 are formed, through which the tube 2 passes, i. protrudes outwards. The recesses 21, 22 preferably correspond to the outer diameter of the tube 2, wherein preferably in this area an airtight seal between the housing parts 4, 5 and the tube 2 is provided. The profiles 16, 17 described in greater detail below also act on this seal.

The housing parts 4, 5 are held between profiles 16, 17, preferably clamped. The profiles 16, 17 are each formed on or outside the resonator chambers 14, 15 extending on both sides of the muffler 1 pipe sections 11, 12. At the same time, these profiles can also be designed to serve as a connection possibility for a further pipe or a hose connection, in particular in order to make possible here an airtight connection of a pipe.

For the sake of completeness, in Fig. 1 Also, the outer shell side 5a of the second housing part 5 and the inner shell side 4b of the first housing part 4 denotes. The shell thickness of both housing parts 4, 5 is constant throughout. The outer diameter of the first housing part 4 corresponds substantially to the inner diameter of the second housing part 5. At the edge of the second housing part 5 is a circumferential bead 13, which facilitates the insertion of the first housing part 4 in the second housing part 5.

Based on FIGS. 2 to 4 Now, the principle of manufacturing a silencer 1 according to the invention can be described. In the manufacturing process, first two housing parts 4, 5 are provided, which are telescopically slidable into one another. For this purpose, outer shell side 4a of the first housing part 4 and inner shell side 5b of the second housing part 5 have a cross-sectional contour that is invariable in the axial direction.

The prefabricated housing parts 4, 5 already have recesses 21, 22 for the passage of the tube 2. During assembly of the muffler 1, the two housing parts 4, 5 are pushed into one another, wherein the extent of the telescoping push is determined by the resonator volume to be achieved. Depending on the application or customer request, any desired resonator volume can be set by means of this modular system. It is not necessary to produce separate or individually dimensioned parts. Only the extent of telescoping must be considered in the assembly, while the housing components used are always the same design.

In the FIGS. 2 to 4 the tube 2 is not shown for the sake of simplicity. It is possible to push the two housing parts 4, 5 prior to their telescoping push from opposite sides of the tube 2. Alternatively, it is possible to slide the two housing parts 4, 5 into each other first and only then to push on the tube 2.

The partition wall 20 accommodated in one of the housing parts 5 can likewise be inserted and fastened at the desired distance from the associated end wall 10 during production of the housing parts, so that any variation of the volume of the second resonator chamber 15 becomes possible.

Fig. 3 shows a variant in which the volume of the first resonator chamber 14 is relatively large. In another application, it may be desired, for example, that the resonator volume is made smaller. For this purpose, according to the invention in the production of the first housing part 4 only a little further into the second housing part 5 are pushed, so that a situation in accordance Fig. 4 results.

The length L1, L2 of the sheaths in the axial direction (as well as the position of the partition wall 20) determines how far the housing parts 4, 5 can be pushed into each other. Preferably, the length L1, L2 of the shell of one of the housing parts 4, 5 is at least half the length L2, L1 of the shell of the other housing part 5, 4. In particularly preferred embodiments, the lengths L1, L2 of the shells are more closely aligned and equal the length L1 of the one shell at least two thirds, more preferably at least three quarters of the length L2 of the other shell. In the in Fig. 1 illustrated embodiment, the shells of the two housing parts 4, 5 have substantially the same length.

The housing parts 4, 5 are preferably made of sheet metal, in particular (noble) steel sheet. The cup-shaped housing parts 4, 5 are deep-drawn sheets.

Fig. 5 finally shows a vehicle 19, with a turbocharger 18 and a connected to the pressure side of the turbocharger 18 muffler 1. This represents a preferred application of the silencer 1 according to the invention.

Fig. 6 FIG. 2 shows a preferred variant of a muffler 1 according to the invention. The tube 2 is formed in the area surrounded by the resonator chambers 14, 15 from a first tube part 2 a and a second tube part 2 b, the first housing part 4 the first tube part 2 a and the second housing part 5 surrounds the second pipe section 2b. The first openings 7 are seated in the casing of the first pipe part 2a and the second openings 8 are seated in the casing of the second pipe part 2b. The pipe parts 2a, 2b are pushed into each other in their end regions. The extent of telescoping is determined by the overlap of the housing parts 4, 5 and thus by the resonator volume.

In this embodiment, the muffler is composed of two halves, wherein the telescoping of the housing parts is accompanied by a telescoping of the pipe parts.

The second tube part 2b is integrally formed with the surrounding housing part 5, preferably from a deep-drawn piece of sheet metal.

This one-piece part further forms a projection 23 which rests against a pipe section 12 extending at least partially outside the resonator chambers 14, 15 and is held externally by a profile 17, preferably a spring clip, so that the projection 23 is in the radial direction between the pipe section 12 and the profile 17 is located.

The partition wall 20 is integrally formed with the first pipe part 2a, which is pushed over the other pipe part 2b, preferably from a deep-drawn piece of sheet metal. As a result, an opposite resonant volume variation of both resonator chambers 14, 15 is made possible (see Fig. 6 ).

In the following, an aspect of the invention will be described which also applies to the embodiments of the Fig. 1 to 4 is applicable. In the overlapping region 6, at least one circumferential sealing ring 24 is inserted between the outer shell side 4a of the first housing part 4 and the inner shell side 5b of the second housing part 5.

In this case, preferably in the jacket of the first housing part 4 and / or in the shell of the second housing part 5, an annular receiving receptacle 25 is formed for the sealing ring 24, wherein preferably the receptacle 25 is formed by an arcuate course of the shell.

Regarding the Fig. 6 Reference is also made to the possibility that at least one of the pipe sections 11, 12 extending outside the resonator chambers can be designed as a separate part from and fixed to the inner pipe 2. Additionally or alternatively, at least one of the two pipe sections 11, 12 may be integrally formed with a housing part 4, 5.

For example, is in Fig. 6 the (left) tube section 11 is formed integrally with the first housing part 4, preferably from a deep-drawn piece of sheet metal.

The (right) pipe section 12 is connected as a separate part to the pipe (here with the second pipe part 2b).

Fig. 7 finally shows a silencer from the outside with a very compact design.

REFERENCE NUMBERS

1

silencer

2

pipe

2a

First pipe part

2 B

Second pipe part

3

coat

4

First housing part

4a

Casing exterior

4b

Coat inside

5

Second housing part

5a

Casing exterior

5b

Coat inside

6

overlap area

7

First opening

8th

Second opening

9

front

10

front

11

First pipe section

12

Second pipe section

13

beading

14

First resonator chamber

15

Second resonator chamber

16

profile

17

profile

18

turbocharger

19

Vehicle 20 Partition wall 21 recess 22 recess 23 projection 24 sealing ring 25 receptacle L1 shell length L2 shell length

Claims (30)

Silencer (1), in particular vehicle silencer, comprising a tube (2) forming a flow channel and a first resonator chamber (14) and a second resonator chamber (15) each surrounding the tube (2) and being arranged one behind the other in the axial direction, wherein the Pipe (2) in its jacket (3) at least a first opening (7), which opens into the first resonator (14), and at least one second opening (8) which opens into the second resonator (15), characterized in that the resonator chambers (14, 15) are formed by a first housing part (4) and a second housing part (5), each having a jacket formed around an axis, the length of the jacket of the one housing part (4 5) is at least half the length of the shell of the other housing part (5; 4), and that the housing parts (4, 5) are pushed into each other and their coats overlap at least partially, wherein in practice Rappel region (6) the outer shell side (4a) of the first housing part (4) on the inner shell side (5b) of the second housing part (5) and the outer shell side (4a) of the first housing part (4) and the inner shell side (5b) of the second housing part ( 5) each have at least in the overlap region (6) a cross-section which is invariable in the axial direction, and in that the housing parts (4, 5) each have a recess (21, 22) through which the flow channel extends. Silencer according to claim 1, characterized in that the outer shell side (4a) of the first housing part (4) and the inner shell side (5b) of the second housing part (5) each have in their predominant areas an unchangeable in the axial direction cross-section. Silencer according to claim 1 or 2, characterized in that the housing parts (4, 5) are each cylindrical in shape and the outer shell side (4a) of the first housing part (4) and the inner shell side (5b) of the second housing part (5) each have a circular cross-section , Silencer according to one of the preceding claims, characterized in that in the axial direction, the length of the jacket of the one housing part (4; 5) at least two thirds, preferably three quarters of the length of the shell of the other housing part (5; 4), wherein particularly preferably the shells of the housing parts (4, 5) have substantially the same length. Silencer according to one of the preceding claims, characterized in that the shells of the housing parts (4, 5) at least in the overlapping region (6), preferably continuously, each having a fixed in the axial direction shell thickness. Silencer according to one of the preceding claims, characterized in that the housing parts (4, 5) each on the overlap region (6) facing away from an end wall (9, 10), in which the recesses (21, 22) for the passage of the tube (2) are formed. Silencer according to one of the preceding claims, characterized in that the housing parts (4, 5) in each case in the region of their recesses (21, 22) with the tube (2) sealingly connected to the outside sealingly. Silencer according to one of the preceding claims, characterized in that the housing parts (4, 5) are welded together in their overlapping region (6). Silencer according to one of the preceding claims, characterized in that the jacket of one housing part (4) and the jacket of the other housing part (5) each form part of the outer wall of the silencer (1). Silencer according to one of the preceding claims, characterized in that the housing parts (4, 5) the airtight seal the resonator chambers (14, 15) to the outside. Silencer according to one of the preceding claims, characterized in that in the overlap region (6) outer jacket has at its edge a bead (13). Silencer according to one of the preceding claims, characterized in that in one of the housing parts (5) sits a partition wall (20) which separates the resonator chambers (14, 15) from each other, wherein the partition wall (20) has a recess for the passage of the tube (20). 2). Silencer according to one of the preceding claims, characterized in that the housing parts (4, 5) between two profiles (16, 17) are clamped, each sitting on a outside of the resonator chambers (14, 15) extending pipe section (11, 12). Silencer according to one of the preceding claims, characterized in that the housing parts (4, 5) made of sheet metal, preferably stainless steel sheet, are formed. Silencer according to one of the preceding claims, characterized in that the tube (2) is formed in the region surrounded by the resonator chambers (14, 15) of a first tube part (2a) and a second tube part (2b), which in their end regions into each other are pushed, wherein the first housing part (4) the first pipe part (2a) and the second housing part (5) surrounds the second pipe section (2b). Silencer according to claim 15, characterized in that at least one of the pipe parts (2b) with the surrounding housing part (5) is integrally formed, preferably from a deep-drawn piece of sheet metal. A silencer according to claim 16, characterized in that the one-piece part has a projection formed (23) extending in an at least partially outside of the resonator cavities (14, 15) tube section (12) is applied and from the outside by a profile (17), preferably a Spring clip, is held so that the projection (23) in the radial direction between the pipe section (12) and the profile (17) is arranged. Silencer according to one of claims 15 to 17, characterized in that the partition wall (20) with one of the pipe parts (2a, 2b), preferably with the one above the other Tube part (2b) pushed tube part (2a), is integrally formed, preferably from a deep-drawn piece of sheet metal. Silencer according to one of the preceding claims, characterized in that in the overlap region (6) at least one circumferential sealing ring (24) between the outer shell side (4a) of the first housing part (4) and the inner shell side (5b) of the second housing part (5) is inserted. A muffler according to claim 19, characterized in that in the jacket of the first housing part (4) and / or in the jacket of the second housing part (5) an annular receiving means (25) for the sealing ring (24) is formed, wherein preferably the receptacle (25 ) is formed by an arcuate course of the shell. Vehicle (19), in particular road-bound vehicle, with a silencer (1), in particular a turbocharger silencer, which is arranged on the pressure side of a turbocharger (18), characterized in that the silencer (1) is a silencer according to one of the preceding claims is. Method for producing a silencer according to one of Claims 1 to 20, comprising a tube (2) forming a flow channel and a first resonator chamber (14) and a second resonator chamber (15) each surrounding the tube (2) and one after the other in the axial direction wherein the tube (2) in its jacket (3) has at least one first opening (7) which opens into the first resonator chamber (14) and at least one second opening (8) which projects into the second resonator chamber (15). opens, characterized in that for the formation of the resonator chambers (14, 15), a first housing part (4) and a second housing part (5), each having a recess (21, 22) for the flow channel and each having a about an axis have trained mantle and are telescopically slidable along the axis are provided, wherein in the axial direction, the length of the shell of the one housing part (4; 5) at least half the length of the shell the other housing part (5; 4) and wherein the outer shell side (4a) of the first housing part (4) in the various telescoping positions on the inner shell side (5b) of the second housing part (5) is present, and that the prefabricated housing parts (4, 5) for Forming the resonator chambers (14, 15) and telescopically telescoped for adjusting a certain resonator volume of a resonator chamber (15) to a corresponding extent. A method according to claim 22, characterized in that the housing parts (4, 5) are pushed over the tube (2), so that the tube (2) through the recesses (21, 22) of the housing parts (4, 5) passes. A method according to claim 22 or 23, characterized in that the housing parts (4, 5) after the adjustment of the resonator volume of a resonator (14) by telescoping the housing parts (4, 5) in their overlap region (6) are welded together. Method according to one of claims 22 to 24, characterized in that the prefabricated housing parts (4, 5) each on the overlap region (6) facing away from an end wall (9, 10), in which a the outer diameter of the tube (2) corresponding recess (21, 22) is formed, and that the housing parts (4, 5) are pushed over the tube (2), so that the at least one first opening (7) in the first resonator (14) and the at least one second opening (8) opens into the second resonator (15). Method according to one of claims 22 to 25, characterized in that the housing parts (4, 6) are prefabricated as cup-shaped parts having in their bottom the recess (21, 22) for the passage of the flow channel. Method according to one of Claims 22 to 26, characterized in that one of the housing parts (5) is provided with a dividing wall (20) which, in the assembled state, separates the first resonator chamber (14) from the second resonator chamber (15). Method according to one of claims 22 to 27, characterized in that the tube (2) is formed in the region surrounded by the resonator chambers (14, 15) of a first tube part (2a) and a second tube part (2b) in their end regions are pushed into one another, wherein the first housing part (4) surrounds the first pipe part (2a) and the second housing part (5) surrounds the second pipe section (2b). A method according to claim 28, characterized in that at least one of the tube parts (2b) with the surrounding housing part (5) is integrally formed, preferably by deep drawing a piece of sheet metal. A method according to any one of claims 22 to 29, characterized in that at least one circumferential sealing ring (24) between the shell outer surface (4a) of the first housing part (4) and the casing inner side (5b) used the second housing part (5) in the overlap region (6) becomes.

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