WO2015164898A1

WO2015164898A1 - Sound attenuator

Info

Publication number: WO2015164898A1
Application number: PCT/AT2015/050104
Authority: WO
Inventors: Christian Hubmann
Original assignee: Henn Gmbh & Co Kg.
Priority date: 2014-04-30
Filing date: 2015-04-28
Publication date: 2015-11-05
Also published as: EP3137752A1; EP3137752B1

Abstract

The invention relates to a sound attenuator (1), in particular turbocharger sound attenuator, having at least one first housing part (2). The first housing part (2) surrounds at least one first resonator chamber (7) at the outside, wherein the first housing part (2) has an outer shell (14) which, in sleeve-like form, surrounds a central longitudinal axis (5). The outer shell (14) of the first housing part (2) has a surface contour (15) in the form of depressions or elevations formed into a cylindrical shell surface (20) of the outer shell (14), wherein the wall thickness (21) of the outer shell (14) in a contoured region of the outer shell (14) is substantially the same as the wall thickness (21) in a non-contoured region.

Description

silencer

The invention relates to a silencer, in particular vehicle silencer, as well as a vehicle equipped with this silencer, as indicated in claims 1 and 14.

A silencer is disclosed in DE 10 2008 001 390 AI. The muffler includes an inner tube in which gas flows, and an outer tube surrounding the inner tube, wherein a gas layer is formed between the outer tube and the inner tube.

The inner tube is formed on the peripheral wall of a thin-walled material and therefore as a membrane which is caused to vibrate by the pressure differences of the medium flowing in the inner tube. By forming the inner tube as a diaphragm, the sound of the gas flowing in the inner tube can be damped. By the described construction of the muffler, the pressure fluctuations of the gas flowing in the inner tube are transferred to the gas layer arranged between the inner and outer tube, wherein the vibrations are damped by this gas layer. In addition, provision may be made for a projection or a sound-absorbing material to be arranged or applied to the inside of the outer tube in order to further weaken or dissipate the sound transmitted in the gas layer.

The embodiment described in DE 10 2008 001 390 A1 has the disadvantage that the muffler is constructed of several parts with a complex geometry. As a result, the production of the muffler is error-prone and the production costs high. Furthermore, the thin-walled material of the inner tube can be damaged at high pressure fluctuations, whereby the life of the muffler will be low.

The present invention has for its object to provide a muffler, which is simple in construction and further has a good sound attenuation s effect.

This object of the invention is achieved by the measures according to claim 1. According to the invention, a turbocharger muffler, with at least one first housing part, which first housing part surrounds at least one first resonator chamber on the outside, is formed. The first housing part has a, a central longitudinal axis sleeve-shaped surrounding outer jacket. The outer casing of the first housing part has a surface contour in the form of indentations or elevations introduced into a cylindrical outer surface of the outer casing, the wall thickness of the outer casing being constant.

An advantage of the inventive design of a silencer is that an improved silencer can be created by the recesses or elevations in the outer shell, which is simple in construction and shows an excellent damping effect. Through the depressions or elevations, the sound can be broken. A surprising advantage of the embodiment of the invention is that not only the sound of the gas flowing inside the muffler is attenuated, but also that the noise emission, which is caused by the muffler, is reduced. This is achieved in particular by the fact that the lateral surface of the muffler is reinforced by the depressions or elevations. Another advantage is that the resonator has a low mass due to the constant wall thickness of the outer jacket. Furthermore, the depressions or elevations in the form of deformations simply introduce into the outer shell. In contrast to designs in which contour ribs or sound insulation are applied on the inside, the design according to the invention is simple and therefore inexpensive to produce.

Furthermore, it may be expedient if the surface contouring is formed in the form of beads introduced into the outer jacket. The advantage here is that particularly beads are easy to bring in the outer shell, as they, for example, in the course of a

Deep drawing process can be introduced into the outer jacket. A further advantage of beads is that their shape is well suited for the refraction of the sound and therefore for a sound attenuation. Furthermore, it can be provided that the first housing part is integrally formed from a sheet metal forming part, such as a deep-drawn part, wherein the outer shell in its basic form, at least partially as rotationally symmetrical hollow body, in particular as a cylindrical sleeve, is formed, and wherein the beads in the hollow cylindrical section of the outer jacket are introduced. The advantage here is that a sheet metal forming part, in particular a deep-drawn part in mass production is inexpensive to manufacture. Furthermore, in the manufacture of a deep drawing parts, a high level of resistance to rejection can be achieved, as a result of which the process reliability for producing a silencer can be increased.

In addition, it can be provided that the beads are formed as elongated, channel-shaped depressions, wherein a longitudinal axis of a bead extends parallel to the central longitudinal axis. The advantage here is that such trained beads are easy to manufacture, especially in a deep-drawing process. For this purpose, in the course of the deep-drawing process in a forming step, a deep-drawing tool can be used, which has a corresponding contouring.

Also advantageous is an embodiment according to which it can be provided that the longitudinal extension of a bead, which is introduced into the hollow cylindrical section of the outer shell, is between 50% and 100%, in particular between 80% and 100%, of the longitudinal extent of the hollow cylindrical section , The advantage here is that a large part of the longitudinal extension of the hollow cylindrical section is provided with beads. Thus, such a silencer can achieve a good refraction of the sound. Furthermore, this reduces the noise emission of such a silencer to a minimum.

In an alternative, it can be provided that the beads, which are introduced into a hollow cylindrical portion of the outer shell, are formed as circumferentially extending, surveys. The advantage here is that such, extending in the circumferential direction surveys can be well made well in a transverse molding process, such as a pressing process. Here, the hollow cylindrical outer shell is pressed by means of a spinning tool to the outside.

According to a development, it is possible that viewed in the circumferential direction, the cumulative longitudinal extension of a bead, which is introduced into the hollow cylindrical portion of the outer shell, between 50% and 100%, in particular between 80% and 100% of the circumference of the first section of the Outer sheath is. The advantage here is that a bead can also be segmented. Such a segmented bead can be used in a transverse They are simply inserted into the outer jacket. Furthermore, such beads can have a sound attenuation in a certain frequency range.

Furthermore, it may be expedient that both corrugations in the form of groove-shaped depressions running parallel to the central longitudinal axis and depressions in the form of circumferential elevations in the outer jacket are formed. The advantage here is that an outer sheath can be produced by such a combination of beads, which has a high rigidity. Thus, the sound emission of such a muffler can be minimized.

In addition, it can be provided that a depth of the surface contouring is between 100% and 800%, preferably between 200% and 600%, in particular between 300% and 500% of a wall thickness of the outer jacket. The advantage here is that especially mufflers with surface contours and a degree of deformation in this value range have a good sound attenuation. In addition, such silencers have a low noise emission. Another advantage of such a formed surface contouring is that it is easy to manufacture in a manufacturing process for mass production. Furthermore, it can be provided that a width of a bead is between 300% and 1500%, preferably between 400% and 1000%, in particular between 400% and 700% of a depth of a bead. The advantage here is that especially mufflers with surface contours and a degree of deformation in this range have a good sound attenuation. In addition, such silencers have a low noise emission. Another advantage of such a formed surface contouring is that it is easy to manufacture in a manufacturing process for mass production.

According to a particular embodiment, it is possible that the muffler comprises two housing parts with a surface contouring according to one of the preceding claims and a Resonatorinnenelement, wherein two resonator chambers are formed, which are each bounded by the Resonatorinnenelement and a housing part. The advantage here is that such a silencer has particularly good damping properties. For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

Furthermore, it can be provided that the surface contouring is designed as a receptacle and the resonator inner element has a counterpart corresponding to the surface contouring, the resonator inner element being held in at least one of the housing parts by means of the surface contouring. The advantage here is that the Resonatorinnenelement no further holding sections needed to be placed in the resonator.

Finally, it can be provided that the surface contouring is arched outwards and forms a groove on the inside of the housing parts and that the counterpart of the Resonatorinnenelementes is formed as a projection and is clamped in the groove. In particular, in the case of a resonator inner element made of a plastic material, there is the advantage that the resonator inner element is clamped in the housing parts, wherein the width of the projection can be kept as low as possible. As a result, different thermal expansions of the inner resonator element and of the housing part do not lead to a plastic deformation of the resonator inner element.

In each case, in a highly simplified, schematic representation:

Fig. 1 shows a first embodiment of a muffler in a perspective

View in the form of a quarter section;

Fig. 2 is a schematic representation of a motor vehicle with a muffler according to Fig. 1;

3 is a perspective view of a first embodiment of a first housing part of a muffler.

4 shows a side view of a first exemplary embodiment of a first housing part of a silencer according to FIG. 3; a sectional view of a first embodiment of a first housing part of a muffler according to the section line VV in Fig. 4;

6 is a perspective view of a second embodiment of a first housing part of a muffler.

7 shows a side view of a second exemplary embodiment of a first housing part of a silencer according to FIG. 6; 8 is a sectional view of a first exemplary embodiment of a second housing part of a silencer according to the section line VIII-VIII in FIG. 7;

9 is a perspective view of a third embodiment of a first housing part of a muffler.

10 is a perspective view of another embodiment of a partially cut silencer shown;

11 shows a cross section of the further exemplary embodiment of the silencer according to FIG

Figure 10;

Fig. 12 is a cross section of another embodiment of the muffler.

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 location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and these position information in a change in position mutatis mutandis to transfer to the new location.

Fig. 1 shows a first embodiment of a muffler 1, in particular a vehicle muffler. Fig. 1 shows an isometric view of the muffler 1, wherein the muffler 1 is shown in a quarter section. The muffler 1 shown in Fig.l comprises a first housing part 2. Furthermore, it can be provided that the muffler 1 includes a second housing part 3 or other housing parts. The housing parts 2, 3 can be connected to one another in a connection region 4. The connection between the housing parts 2, 3 can preferably be realized by a cohesive connection, in particular a welded connection, such as a laser welding connection. Furthermore, it can be provided that the muffler 1 is formed in a preferred embodiment as a rotationally symmetrical hollow body and has a central longitudinal axis 5. Furthermore, it is also conceivable that the muffler 1 has approximately a rectangular or a polygonal cross section.

In the advantageous embodiment of the muffler 1 according to FIG. 1, it can be provided that the muffler 1 comprises a first housing part 2, a second housing part 3 and a resonator inner element 6. As can be seen in FIG. 1, provision can be made for the resonator inner element 6 to be accommodated between the first housing part 2 and the second housing part 3.

In particular, it can be provided that a first resonator chamber 7 and a second resonator chamber 8 are formed by the illustrated arrangement of the first housing part 2, second housing part 3 and resonator inner element 6. As can be seen in FIG. 1, the first resonator chamber 7 can be bounded on the outside by the first housing part 2 and on the inside by the resonator inner element 6. The second resonator chamber 8 can be bounded on the outside by the second housing part 3 and on the inside by the resonator inner element 6. Furthermore, it can be provided that the resonator inner element 6 and the first housing part 2 and the second housing part 3 are formed in an advantageous embodiment of deep-drawn parts. In a preferred embodiment, the individual parts may be shaped so that the resonator inner element 6 in the first housing part 2 and / or in the second Housing part 3 can be accommodated and that the muffler 1 only in the connection region 4 has a material connection, to which the first housing part 2 and the second housing part 3 are interconnected. Furthermore, it can be provided that the first housing part 2 has an inflow opening 9 and integrated therein an axially tapered step 10 formed in the axial section. Such a stepped tapered neck 10 may be provided for receiving a coupling element. In particular, it can be provided that a coupling element is received in the stepped tapered neck 10, which serves to connect the muffler 1 to a turbocharger 11.

Furthermore, it can be provided that the second housing part 3 has an outflow opening 12. At the outflow opening 12, a connecting piece 13 may be arranged, which serves for the connection of a pressure hose.

Furthermore, it can also be provided that the muffler 1 optionally has only one resonator chamber 7 or additional resonator chambers. Accordingly, the muffler 1 can be constructed of different numbers of individual parts. According to the invention, a surface contouring 15 is provided in at least one housing part 2 and / or 3, or else in a further housing part, not shown, in the outer jacket 14, by which the damping behavior of the muffler 1 is improved. Different design options of the surface contouring 15 will be described in more detail later, or shown.

On the basis of the representation of the muffler 1 according to FIG. 1, a possibility for producing such a muffler 1 will be described.

In a production process for producing the muffler 1, it may be provided that the first housing part 2, the second housing part 3 and the resonator inner element 6 are deep-drawn so that they receive their characteristic shape. It can be provided that the surface contouring 15 is introduced into a housing part 2 and / or 3 during the deep-drawing process. A thermoforming tool must accordingly be designed in order to be able to integrate the surface contouring 15 into the housing part 2 and / or 3. Alternatively, it may be provided that the surface contouring 15 is introduced into one of the housing parts 2 and / or 3 after the deep-drawing process, for example in a further production step.

Another method step for producing a muffler 1 shown in Fig. 1 comprises the assembly of the individual components of the muffler. 1

When assembling the silencer 1, either the first housing part 2 or the second housing part 3 can be used as a base, with the remaining components being placed and assembled on the base. In this embodiment, the exemplary assembly will be described on the assumption that the first housing part 2 constitutes the base member for assembly.

The first housing part 2 can be used in a mounting device to be held there. Furthermore, it is also conceivable that the first housing part 2 is held by a manipulator, for example a robot.

In a further method step, the resonator inner element 6 can be inserted into a first receiving portion 16 of the first housing part 2. In particular, it can be provided that a centering lug 17 of the resonator inner element 6 is received in the first receiving section 16.

In a further method step, it can be provided that the second housing part 3 is plugged onto the resonator inner element 6 protruding from the first housing part 2. Because the resonator inner element 6 is already connected to the first housing part 2, the second housing part 3 is thus also positioned relative to the first housing part 2. In particular, the centering projection 17 of the resonator inner element 6 cooperates with a second receiving portion 18 of the second housing part 3. In other words, the centering lug 17 serves to be able to position and center the second housing part 3 relative to the first housing part 2. In particular, in this case the first receiving portion 16 is positioned to the second receiving portion 18. In this joining process, the two housing parts 2, 3 are pushed against one another or pressed against one another until they contact one another in the region of the first receiving section 16 and in the region of the second receiving section 18. Advantageously, in this case the axial extension of the centering projection 17, the axial extent of the second receiving portion 18, and the axial extent of the first receiving portion 16 are selected such that in the assembled state the resonator inner element 6 is received in a fixed position between the first housing part 2 and the second housing part 3.

In a further method step, the first housing part 2 can now be welded to the second housing part 3. In particular, the abutting receiving sections 16, 18 are welded here. As a welding method for an industrial manufacturing process, in particular a mass production, a laser or a plasma welding process is advantageously used here. However, it is also conceivable that any other welding method is used, which is adapted to connect the two housing parts 2, 3 cohesively with each other.

2 shows a vehicle 19, in particular a road-bound vehicle with internal combustion engine, which is equipped with a silencer 1 according to the invention. As can be seen in FIG. 2, it can preferably be provided that the muffler 1 is arranged on the pressure side of the turbocharger 11. Alternatively, it can be provided that the muffler 1 is arranged elsewhere in the intake manifold of the internal combustion engine.

FIGS. 3 to 8 show various exemplary embodiments of a first housing part 2 with different possibilities for the design of the surface contouring 15 according to the invention.

FIGS. 3 to 5 show a first exemplary embodiment of a housing part 2 according to the invention, the same reference numerals and component designations being used for the same parts as in the preceding FIG. 1. To avoid unnecessary repetitions Reference is made to the detailed description in the preceding Fig. 1 or reference.

In Fig. 3 the housing part 2 according to the invention is shown in a perspective view. It can be seen here that the surface contouring 15 is introduced into the outer casing 14. In particular, it is provided that the surface contouring 15 is introduced into a cylindrical jacket surface 20 of the outer jacket 14, the cylindrical jacket surface 20 also having a constant and constant wall thickness 21 in the area of the surface contouring 15.

Furthermore, it can be provided that the surface contouring 15, as can be seen in FIG. 3, is designed in the form of beads 22. As further seen in Fig. 3, it may be provided that the first housing part 2 is preferably formed in one piece from a sheet metal forming part, such as a deep-drawn part. The outer jacket 14 of the housing part 2 is in this case formed as a rotationally symmetrical hollow body.

In particular, it can be provided that the outer casing 14 is at least partially formed as a cylindrical sleeve, resulting in a hollow cylindrical portion 23 of the outer shell 14 results. As can be seen in FIGS. 3 and 4, it can be provided that the beads 22 are introduced into the hollow cylindrical section 23 of the outer jacket 14. As shown in FIG.

3 and 4 further seen, the beads 22 are introduced in this embodiment, the extent in the cylindrical surface 20, that the beads 22 are formed as elongated, channel-shaped recesses, wherein a longitudinal axis 24 of a bead 22 parallel to the central longitudinal axis 5.

Such formed beads 22 can be well introduced during the manufacture of the housing part 2 by means of a deep-drawing process in the hollow cylindrical portion 23. The fact that in a deep-drawing process, the cylindrical outer surface 20 is deformed, resulting in the outer jacket 14, the constant wall thickness 21, which is constant even in the region of the beads 22. It can be advantageous if, as can be seen in FIGS. 3 and 4, the longitudinal extent 25 of a bead 22 is between 50% and 100%, in particular between 80% and 100%, of the longitudinal extent 26 of the hollow cylindrical section 23. As further seen in Figures 3 and 4, a bead 22 due to manufacturing an initial region 27 and an end portion 28. The starting region 27 of a bead 22 is that region of the bead 22 which is arranged on a transitional rounding 29 between an end wall 30 and the hollow cylindrical section 23. The characteristic appearance of this initial region 27 depends on how large the radius the transition curve 29 is chosen. With a bead 22, which is produced during the deep-drawing process by a contoured deep-drawing tool, it is essential that an initial region 27 is formed, since the bead 22 is introduced into the cylindrical outer surface 20 during the deep-drawing process. As an alternative to the production of the bead 22, according to FIGS. 3 to 5, by means of a deep-drawing tool, it is also conceivable for beads 22 formed in this way to be introduced into the hollow-cylindrical section 23 by means of a spinning tool. It is also conceivable that a bead 22 extends only over a certain portion of the hollow cylindrical portion 23.

The end portion 28 of a bead 22 always forms a transition of the bead 22 to the cylindrical lateral surface 20th

5 shows that an indentation depth or depth 31 of the surface contouring 15 or bead 22 is between 100% and 800%, preferably between 200% and 600%, in particular between 300% and 500%, of a wall thickness 21 of the outer jacket 14 may be. The depth 31 of a bead 22 is significantly responsible for the insulating behavior of a muffler 1. Since the beads 22 of the cylindrical lateral surface 20 impart a certain rigidity, the sound behavior of the muffler 1 can also be positively influenced by the configuration of the beads 22. The reduction of the sound intensity of such a silencer 1 results from the fact that the shaping of the surface contouring 15 the Rigidity of the first housing part 2 is increased. As a result, pressure fluctuations in the interior of the housing part 2 can be better absorbed by the cylindrical jacket surface 20. Compared to a first housing part 2, in which no beads 22 are introduced, thus oscillating movements in the cylindrical lateral surface 20 can be reduced or a frequency of the oscillation can be positively changed, so that disturbing sound of a silencer 1 formed in this way can be largely avoided.

A further embodiment feature of the surface contouring 15 or the bead 22 is, in addition to the depth 31, a width 32. The width 32 of a bead 22 is between 300% and 1500%, preferably between 400% and 1000%, in particular between 400% and 700%. the depth 31 of the bead 22. The ratio of depth 31 to width 32 is crucial for the design of the transition radii between bead 22 and cylindrical surface 20. If a bead 22 has a large indentation depth 31 compared to its width 32, it is necessary in that the transitions between the bead 22 and the cylindrical outer surface 20 have a small radius. In contrast, if a bead 22 has only a small indentation depth 31 compared to the width 32, then the bead 22 can have large transition radii. For the Dämmverhalten or the radiation behavior of the muffler 1 in addition to the shape of the surface contouring 15 and the beads 22 and the number of beads 22 prevail. In the exemplary embodiment shown in FIGS. 3 to 5, as can be seen in FIG. 5, eight beads are distributed over the circumference of the cylindrical jacket surface 20. This results in a pitch angle of 45 ° in which the beads 22 are arranged on the cylindrical circumferential surface 20. However, the number or arrangement of the beads 22 is not limited to this embodiment. Rather, it is also conceivable that a minimum of two beads 22 are introduced into the cylindrical outer surface 20 up to a very large number of beads 22. The actual or useful number of beads 22, which are distributed over the circumference of the lateral surface 20, depends strongly on the width 32 of a single bead 22 or of an inner diameter 33 of the cylindrical lateral surface 20. As can be seen in FIG. 5, an outer circumferential surface 34 has the constant offset to an inner circumferential surface 35, as a result of which the constant wall thickness 21 can also be seen.

FIGS. 6 to 8 show a further embodiment of a first housing part 2 of the muffler 1, which is possibly independent of itself, wherein the same reference numerals or component designations are again used for the same parts as in the preceding FIGS. 1 to 5. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding figures 1 to 5 or reference. In contrast to the previous Ausführungsbespiel from Fig. 3 to Fig. 5, the beads 22 are not introduced in this embodiment in the direction of the longitudinal axis 5, but extend in the peripheral direction 36 of the cylindrical surface 20. Such a trained bead 22 has a certain angular extent 37th in the circumferential direction 36. As shown in this embodiment, it can be provided that a bead 22 formed in this way is not formed by a single groove running continuously in the circumferential direction 36, but that the bead 22 is segmented in the circumferential direction 36. As an angular extent 37 in the circumferential direction 36 in this case the angular extent 37 of a single segment of a bead 22 is considered. A cumulative angular extent 37 is that angular range or angular segment which results from the summation of the angular extent 37 of the individual beads 22 in the circumferential direction 36. It can be advantageous in this case if the cumulative angular extent 37 of a bead 22 in the hollow cylindrical section 23 of the outer shell 14 is between 50% and 100%, in particular between 80% and 100% of a full circle in the region of the hollow cylindrical section 23.

In addition, it can be provided that not only a series of beads 22 is arranged on the cylindrical lateral surface 20, but that a plurality of rows of beads 22 are arranged side by side on the cylindrical lateral surface 20. In particular, it can be provided that, as can be seen in FIG. 7, two rings of beads 22 are arranged next to each other. In addition, it is also possible that further, not shown, beads 22 are arranged on the cylindrical lateral surface 20. Such beads, as shown in this embodiment, are preferably produced by means of a spinning tool. In this case, the corresponding tool presses against the inner circumferential surface 35 of the outer shell 14, so that the beads 22 are pressed to the outside. Alternatively, it can be provided that during the deep drawing process, the beads 22 are formed by a transverse machining tool.

A spacing 38 of the bead rings 22 relative to one another in the direction of the longitudinal axis 5 is preferably selected to be so large that a partial section of the undeformed cylindrical jacket surface 20 is maintained between the two bead rows.

FIG. 9 shows a further embodiment of a first housing part 2 of the muffler 1, which is possibly independent of itself, wherein the same reference numerals or component designations are again used for the same parts as in the preceding FIGS. 1 to 8. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding figures 1 to 8 or reference.

In the embodiment according to FIG. 9, beads 22, which are introduced in the longitudinal direction parallel to the longitudinal axis 5 into the outer jacket 14, combined with beads 22, which are introduced in the circumferential direction 36 in the outer jacket 14. Such a combination of beads 22 may have the advantage that the damping effect of a muffler 1 is improved to an increased extent, since the outer jacket 14 is significantly stiffened.

Furthermore, it can also be provided that the surface contouring 15 is designed according to embodiments not shown. For example, it is conceivable that similar lent, as in the embodiment of FIG. 6, in the circumferential direction 36 extending beads 22 are introduced into the outer casing 14, wherein these are formed as circumferential grooves. Such beads can be produced for example by a rolling process. Furthermore, it is also conceivable, for example, for a surface contour 15 to be produced in the form of punctiform elevations or depressions. Such elevations or depressions may have, for example, a round or polygonal base surface. In addition, it is possible that the contouring of the outer jacket 14, for example, with a diagonally ribbed structure, as it is present in a corrugated sheet, is formed. FIGS. 10 and 11 show a further embodiment of a muffler 1, which is possibly independent of itself, again using the same reference numerals or component designations for the same parts as in the preceding FIGS. 1 to 9. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding figures 1 to 9 or reference.

The further embodiment of the muffler 1 will be described below with reference to a combination of Figures 10 and 11, wherein the Fig. 10 shows the muffler 1 in a perspective view with a partial sectional view and Fig. 11 shows a cross section of the muffler 1 according to the section line XI XI of Fig. 10 shows.

As can be seen from FIGS. 10 and 11, it can be provided that the surface contouring 15 simultaneously serves as a fastening element 39 and the resonator inner element 6 has a corresponding counterpart 40 which corresponds to the fastening element 39. In particular, the resonator inner element 6 can thereby be accommodated in a form-fitting manner in the two housing parts 2, 3 and thus secured or fixed in its position.

According to the embodiment according to FIGS. 10 and 11, it can be provided that the surface contouring 15, which serves as fastening element 39 in this case, is arched outwardly and forms a groove 42, in particular a receiving groove, on the inside 41 of the housing parts 2, 3 , The counterpart 40 of the Resonatorinnenelementes 6 may be formed as a projection 43 or as a receiving nose. The counterpart 40 may be dimensioned such that it is clamped or received in the groove 42. Furthermore, it can be provided that the Resonatorinnenelement 6 is formed of a plastic material and therefore the counterpart 40 has a first coefficient of thermal expansion with a first thermal expansion and that the groove 42 which is inserted in the metallic housing part, having a second coefficient of thermal expansion with a second thermal expansion. Since the coefficients of thermal expansion of plastic and metal are very different, it may happen that when a heating of the muffler 1, the pressing force between counterpart 40 and groove 42 increases. This can lead to a plastic deformation of the counterpart 40, wherein in a subsequent cooling of the muffler 1 due to the initiated plastic deformation a clearance or gap between counterpart 40 and groove 42 may arise. To keep this game as low as possible, it can be provided that the width of the groove 42 and the counterpart 40 is kept as low as possible. In particular, the width of the groove 42 and the counterpart 40 between 1 mm and 5 mm, preferably between 2 mm and 4 mm, are selected.

As can be seen from FIG. 11, it can be provided that preferably three surface contours 15 are formed distributed over the circumference, by means of which the resonator inner element 6 is held in position. The execution of three Oberflächenkonturierungen 15 has the advantage that the resonator inner element 6 fixed in the position in the housing parts 2, 3 can be accommodated and there is no static overdetermination.

As can also be seen from FIG. 11, it can be provided that the resonator inner element 6 or the housing parts 2, 3 have a flat 44 and therefore do not form a rotation-symmetrical shape in certain regions.

FIG. 12 shows a further embodiment of a muffler 1, which is possibly independent of itself, again using the same reference numerals or component designations for the same parts as in the preceding FIGS. 1 to 11. In order to avoid unnecessary repetition, reference is made to the detailed description in the preceding figures 1 to 11 or reference.

FIG. 12 likewise shows a cross section of the muffler 1 according to the section line XI-XI according to FIG. 10.

In the exemplary embodiment according to FIG. 12, a further embodiment possibility of the surface contouring 15 is shown, wherein in this exemplary embodiment the surface contour 15 is pulled in the direction of the inside 41. For this reason, at the Embodiment, the Resonatorinnenelement 6 Nutförmig be formed and the housing parts 2, 3 form the corresponding counter survey.

The embodiments show possible embodiments of the muffler 1, wherein it should be 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 possible with each other and this variation possibility due to the teaching of technical Acting by objective invention in the skill of those working in this technical field is the expert.

Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions. The task underlying the independent inventive solutions can be taken from the description.

All statements of value ranges in the present description should be understood to include any and all sub-ranges thereof, e.g. is the statement 1 to 10 to be understood that all sub-areas, starting from the lower limit 1 and the upper limit 10 are included, ie. all sub-areas begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10. Above all, the individual embodiments shown in FIGS. 1, 3 to 5, 6 to 8 and 9 can be the subject of independent solutions according to the invention form. The relevant objects and solutions according to the invention can be found in the detailed descriptions of these figures.

For the sake of order, it should finally be pointed out that for a better understanding of the structure of the muffler 1, these or their components have been shown partially unevenly and / or enlarged and / or reduced in size. Reference symbol Muffler 29 Transitional rounding

first housing part 30 end wall

second housing part 31 depth

Connection area 32 width

Longitudinal axis 33 inner diameter

Resonatorinnenelement 34 outer circumferential surface

first resonator chamber 35 inner circumferential surface

second resonator chamber 36 in the circumferential direction

Inlet opening 37 angular extent in the circumferential step-shaped tapering ausgebilrichtung

determining approach 38 Spacing in longitudinal axis direction turbocharger device

Outflow opening 39 fastening element

Connecting piece 40 counterpart

Outer jacket 41 inside

Surface contouring 42 Groove

first receiving portion 43 projection

Centering shoulder 44 Flattening

second receiving section

vehicle

cylindrical surface

Wall thickness

Beading

hollow cylindrical section

Longitudinal axis bead

Longitudinal extension of a bead

Longitudinal extension of the hollow cylindrical section

initial region

end

Claims

Patent claims

1. Turbocharger muffler (1), with at least a first housing part (2), which first housing part (2) at least a first resonator chamber (7) on the outside surrounds, wherein the first housing part (2), a central longitudinal axis (5) sleeve-shaped comprising outer sheath (14), characterized in that the outer sheath (14) of the first housing part (2) has a Oberflächenkonturierung (15) in the form of in a cylindrical outer surface (20) of the outer sheath (14) introduced recesses or elevations, wherein the wall thickness (21) of the outer sheath (14) in a contoured region of the outer sheath (14) is substantially the same as the wall thickness (21) in a non-contoured area.

2. Silencer according to claim 1, characterized in that the surface contouring (15) in the form of in the outer shell (14) introduced beads (22) is formed.

3. Silencer according to claim 1 or 2, characterized in that the first housing part (2) is formed integrally from a sheet metal forming part, such as a deep-drawn part, wherein the outer shell (14) in its basic form, at least in sections as a rotationally symmetrical hollow body, in particular as a cylinder sleeve, is formed, and wherein the

Beads (22) in the hollow cylindrical portion (23) of the outer shell (14) are introduced.

4. Silencer according to one of claims 2 or 3, characterized in that the beads (22) are formed as elongated, groove-shaped, recesses, wherein a longitudinal axis (24) of a bead (22) parallel to the central longitudinal axis (5).

5. Silencer according to claim 4, characterized in that the longitudinal extent (25) of a bead (22) which is introduced into the hollow cylindrical portion (23) of the outer shell (14), between 50% and 100%, in particular between 80% and 100% of the longitudinal extent (26) of the hollow cylindrical portion (23).

6. Silencer according to claim 2 or 3, characterized in that the beads

(22), which are introduced into a hollow cylindrical portion (23) of the outer shell (14), as in the circumferential direction (36) extending, surveys are formed.

7. Silencer according to claim 6, characterized in that viewed in the circumferential direction (36), the cumulative angular extent (37) of a bead (22) which is introduced into the hollow cylindrical portion (23) of the outer shell (14), between 50% and 100 %, in particular between 80% and 100% of a full circle of the hollow cylindrical portion (23) of the outer shell (14).

8. Silencer according to one of claims 2 to 7, characterized in that both beads (22) in the form of the central longitudinal axis (5) parallel to (24) extending, channel-shaped depressions and in the form of in the circumferential direction (36) extending elevations in the outer casing (14) are formed.

9. Silencer according to one of the preceding claims, characterized in that a depth (31) of the surface contouring (15) between 100% and 800%, preferably between 200% and 600%, in particular between 300% and 500% of a wall thickness (21) of the outer jacket (14) is.

10. Silencer according to one of the preceding claims, characterized in that a width (32) of a bead (22) between 300% and 1500%, preferably between 400% and 1000%, in particular between 400% and 700% of a depth (31) the bead (22) is.

11. Silencer according to one of the preceding claims, characterized in that the silencer (1) comprises two housing parts (2, 3) with a surface contouring (15) according to one of the preceding claims and a resonator inner element (6), wherein two resonator chambers (7) are formed, each of which by the Resonatorinnenele- element (6) and a housing part (2, 3) are limited.

12. Silencer according to claim 11, characterized in that the surface contouring (15) is designed as a fastening element (39) and the Resonatorinnenelement (6) has a counterpart (40) corresponding to the fastening element (39), the resonator inner element (6) being held in at least one of the housing parts (2, 3) by means of the surface contouring (15).

13. Silencer according to claim 12, characterized in that the surface contouring (15) is arched outwards and on the inside (41) of the housing parts (2, 3) forms a groove (42) and that the counterpart (40) of the Resonatorinnenelementes ( 6) is formed as a projection (43) and is clamped in the groove (42).

14. Vehicle (19), in particular road-bound vehicle, with a muffler (1), in particular a turbocharger muffler, which is arranged on the pressure side of a turbocharger (11), characterized in that the muffler (1) according to one of the preceding claims is trained.