EP2196640A2 - Silencer - Google Patents

Abstract

The silencer (10) has a jacket (14) and two front walls (16,18), a housing (12) comprising an exhaust gas inlet opening and an exhaust gas outlet opening and silencer elements placed in the housing. The silencer elements placed in the housing comprise an inlet or outlet pipe section (24), which opens in a jacket side exhaust gas inlet opening or exhaust gas outlet opening (20) of the housing with an end or extends outward through these. The exhaust gas inlet opening or exhaust outlet opening is provided with a locking plate (26). An independent claim is also included for a method for manufacturing a silencer.

Description

The present invention relates to a silencer, in particular rear silencer, for an exhaust system of an internal combustion engine, in particular a motor vehicle engine, comprising a housing comprising a shell and two end walls, at least one exhaust gas inlet opening and at least one exhaust gas outlet opening and at least substantially muffler elements housed in the housing. It further relates to a method for producing such a silencer.

Such mufflers are used as standard in motor vehicles in particular in order to reduce the noise level generated by the vehicle engine. In order to fix the muffler elements to be accommodated in the housing with respect to the jacket, a sleeve has hitherto been inserted into the jacket and a weld is made within the jacket. However, such a welding within the shell is at least difficult, in particular in the case of a mounting of the silencer transverse to the direction of travel of the relevant motor vehicle.

The invention has for its object to provide an improved muffler of the type mentioned, which is particularly easy to install, especially in a transverse installation.

With regard to the silencer, this object is achieved according to the invention in that the silencer elements accommodated at least substantially in the housing comprise an inlet or outlet pipe section which is connected to a first end in a shell-side exhaust gas inlet section. or exhaust gas outlet opening of the housing opens or extends through the latter to the outside, and that this Abgaseintritts- or exhaust outlet opening is provided in a separately manufactured from the jacket, then connectable with this closure plate, through which provided in the shell, in a shell end opening opening closable is.

Due to this design, the muffler is particularly suitable for a transverse installation in the relevant motor vehicle. While the at least one exhaust gas inlet or exhaust gas outlet opening is provided on the shell side, the at least one exhaust gas outlet or exhaust gas inlet opening can be provided in particular on at least one of the two end sides. By providing the jacket with a recess opening into a jacket end face, the muffler elements to be accommodated at least essentially in the housing, including the inlet or outlet pipe piece, can be pushed into the jacket from the relevant jacket end side. In this case, these muffler elements can already be firmly connected to each other before, for example, welded. Welding within the shell is therefore not required. The recess provided in the jacket can then be closed by the closure plate, which is manufactured separately from the jacket and provided with the exhaust gas inlet or exhaust gas outlet opening.

According to a preferred practical embodiment of the silencer according to the invention, the silencer elements to be accommodated at least substantially in the housing, including the inlet or outlet pipe section, are designed as a prefabricated, in particular dimensionally stable insert, separate from the jacket. This encompassing the at least substantially housed in the housing silencer elements Insert can then be inserted from the adjacent to the recess, then closable by a first end wall shell end side forth in the longitudinal direction of the housing in the jacket.

The insert, which is prefabricated separately from the casing, preferably comprises a support element which can be inserted into the casing in the sliding seat and to which the inlet or outlet pipe piece is firmly connected. The inlet or outlet pipe piece can therefore be connected in advance firmly with this support element. Welding within the shell is therefore no longer necessary.

Advantageously, the inlet or outlet pipe piece is connectable via the closure plate with the shell. In this case, advantageously, the insert via the connection of the inlet pipe piece with the closure plate and the connection of the closure plate with the shell in the shell can be fixed. The closure plate can already be connected to the inlet or outlet pipe piece, in particular welded, before or only after the insert has been inserted. The closure plate can then be fixedly connected to the jacket, in particular welded again.

Welding within the shell is therefore no longer necessary.

The jacket can in particular be longitudinally folded and / or welded.

Preferably, at least the first end wall is subsequently also welded, ie after the insertion of the silencer elements or of the comprehensive insert into the jacket, with the jacket. It can thus be welded all in one. So now all welds can be made by a single robot in a single operation be, which brings a particularly cost-effective production or assembly with it.

The closure plate can be made larger than the recess, whereby an optimal closure of the recess is ensured and the stability is increased.

In particular, the closure plate can also be made thicker than the jacket, which in turn results in a higher stability. In addition, the jacket can be made substantially thin-walled, thus weight is saved.

In particular, in the event that the relevant end of the inlet or outlet pipe piece extends through the provided in the closure plate exhaust inlet or exhaust outlet opening to the outside, it is also advantageous if the closure plate is provided with a collar. In this case, this collar can enclose at least a part of the outwardly extending end of the inlet or outlet pipe piece, resulting in particular again a higher stability. In principle, however, such a collar is also conceivable when the inlet or outlet tube piece opens into the gas inlet or gas outlet opening provided in the closure plate.

In addition to the inlet or outlet tube piece, the insert may in particular also comprise one or more further tube pieces firmly connected to the support element.

According to an expedient practical embodiment, a first chamber, in particular a reflection chamber, and between between the support element and the first end wall adjacent to the closure plate the support member and the second end wall, a second chamber, in particular resonance chamber formed.

It is also advantageous, in particular, when the support element comprises two partitions having a spacing from one another in the housing longitudinal direction, between which a third chamber is formed, which may in particular be an absorption chamber.

The partition wall provided between the first and third chambers preferably has a perforation, via which the first chamber communicates with the third chamber.

In contrast, the partition wall provided between the second and the third chamber is preferably not perforated.

The inlet or outlet pipe piece may in particular have a perforation, via which it is connected to the first chamber.

The insert preferably comprises one or more further tube pieces fixedly connected to the support element, which are respectively connected to the first chamber via a perforation, extend through the support element or the third chamber and through the second chamber and in each case into one in the second Front wall provided gas outlet or gas inlet opening. In this case, one, two or even a plurality of such, each in a provided in the second end wall gas outlet or gas inlet opening pipe sections may be provided.

Basically, however, one or more further firmly connected to the support member pipe pieces are conceivable, each in a in the first end wall provided gas outlet or gas inlet opening.

The inlet or outlet pipe piece can pass through the support element or the third chamber and open with its second end in the second chamber.

According to a preferred practical embodiment, the insert comprises a resonance tube piece which is inserted at one end into the second end of the inlet or outlet tube piece and opens at its other end into the second chamber formed as a resonance chamber. In this case, the cross section of the resonance tube piece can be smaller than the cross section of the inlet or outlet tube piece in particular.

The resonance tube piece can be supported in the second chamber via at least one connecting element on at least one pipe piece which opens into a gas outlet or gas inlet opening. By this support and in particular by the fact that the resonance tube piece is passed, for example, through an opening provided in the adjacent partition opening, this resonance tube piece is again set relative to the support member.

The inventive method for producing a muffler according to the invention is characterized in that the at least substantially housed in the housing silencer elements including the inlet or outlet pipe piece are prefabricated as particular dimensionally stable use separately from the jacket, that the jacket is made with a opening into a mantle end recess in that a closure plate having the exhaust gas inlet or exhaust gas outlet opening is manufactured separately from the jacket, that the insert is inserted in the jacket in the longitudinal direction of the housing in the jacket adjacent to the recess, then closable by an end wall in the longitudinal direction of the housing and that the recess provided in the jacket is then closed by the closure plate having the exhaust gas inlet opening, wherein the closure plate connected to the jacket, in particular welded becomes. The closure plate can already be connected, in particular welded, in advance or else only after the insert has been inserted, with the end of the inlet or outlet tube piece which opens out into the exhaust gas inlet opening or exhaust gas outlet opening and out through it.

The silencer according to the invention can in principle be used both as a pre, main or as a rear muffler. Preferably, however, is the use as a rear muffler.

The silencer according to the invention is particularly suitable for transverse installation. An exit is conceivable on one or both ends.

Fig. 1

eine schematische Längsschnittdarstellung einer beispielhaften Ausführungsform eines Schalldämpfers,

Fig. 2

eine schematische Längsschnittdarstellung des um 90° um seine Längsachse gedrehten Schalldämpfers,

Fig. 3

eine schematische Stirnansicht des Schalldämpfers, bei der die Gasaustrittsöffnungen zu erkennen sind,

Fig. 4

eine schematische Querschnittsdarstellung des Schalldämpfers, geschnitten entlang der Linie C-C der Fig. 1,

Fig. 5

eine schematische Querschnittsdarstellung des Schalldämpfers geschnitten, entlang der Linie A-A der Fig. 2, und

Fig. 6

eine schematische Querschnittsdarstellung des Schalldämpfers, geschnitten entlang der Linie B-B der Fig. 2.

The invention will be explained in more detail below with reference to an embodiment with reference to the drawing; in this show:

Fig. 1

FIG. 2 is a schematic longitudinal sectional view of an exemplary embodiment of a muffler; FIG.

Fig. 2

a schematic longitudinal sectional view of the rotated 90 ° about its longitudinal axis muffler,

Fig. 3

a schematic end view of the muffler, in which the gas outlet openings are visible,

Fig. 4

a schematic cross-sectional view of the muffler, taken along the line CC of Fig. 1 .

Fig. 5

a schematic cross-sectional view of the muffler cut along the line AA Fig. 2 , and

Fig. 6

a schematic cross-sectional view of the muffler, taken along the line BB of Fig. 2 ,

Fig. 1 shows a schematic longitudinal sectional view of an exemplary embodiment of a muffler 10, in particular rear muffler, for an exhaust system of an internal combustion engine, in particular motor vehicle engine. The silencer can basically be used as a pre-, main- or as a rear silencer. Preferably, however, is the use as a rear muffler.

Fig. 2 shows a schematic longitudinal sectional view rotated by 90 ° about its longitudinal axis muffler 10th

The muffler 10 has a housing 12, which comprises a jacket 14 and two end walls 16, 18 and at least one exhaust gas inlet opening 20 and at least one exhaust gas outlet opening 22, 22 'has. In the present embodiment, an exhaust gas inlet opening 20 and two exhaust gas outlet openings 22, 22 'are provided. The silencer 10 also includes at least substantially housed in the housing 12, described in more detail below muffler elements.

As based on the Fig. 1 and 2 1, the silencer elements to be accommodated, at least substantially, in the housing 12 include, inter alia, an inlet pipe piece 24 which opens with a first end in a shell-side exhaust gas inlet opening 20 of the housing 12 or, as in the present embodiment, extends outwardly through the latter. In this case, this exhaust gas inlet opening 20 is provided in a separately manufactured from the jacket 14, then connectable with this closure plate 26 through which a provided in the jacket 14 recess 28 is subsequently closed, in a jacket end face in the Fig. 1 and 2 the left side of the jacket, opens.

The silencer elements, including the inlet pipe piece 24, which are to be accommodated at least substantially in the housing 12 are preferably designed as a prefabricated, in particular dimensionally stable insert 30, separate from the jacket 14. In this case, this is the at least substantially housed in the housing 12 silencer elements including the inlet tube piece 24 comprehensive insert 30 of the adjacent to the recess 28, then closable by a first end wall 16 shell end side in the longitudinal direction L of the housing 12 in the shell 14 can be inserted.

As based on the Fig. 1 and 2 it can be seen, the insert 30, which is prefabricated separately from the casing 14, comprises a support element 32 which can be inserted into the casing 14 in a sliding fit, with which the inlet pipe piece 24 can be firmly connected from the outset. The insert 30 can thus be prefabricated with the inlet pipe piece 24 firmly connected to the support element 32 and then be inserted as a dimensionally stable unit in the jacket 14.

Subsequently, the inlet pipe piece 24 via the closure plate 26 with the jacket 14 is connectable.

In this case, the insert 30 can be fixed in the jacket 14 via the connection of the inlet tube piece 24 to the closure plate 26 and the connection of the closure plate 26 to the jacket 14.

In this case, the inlet pipe 24 can already be connected in advance or only after the introduction of the insert with the closure plate 26, in particular welded. The closure plate 26 is connected after insertion of the insert in the jacket 14 with this, in particular welded again.

The jacket 14 may in particular be longitudinally folded and / or welded.

In addition, at least the first end wall 16 after insertion of the insert 30 with the jacket 14 are welded. In principle, the second end wall 18 can be welded to the jacket 14 again.

The separate to the jacket 14 prefabricated insert 30 can thus be inserted or inserted from the one end face in the jacket 14. This is possible by the fact that the jacket 14 is provided with a recess 26 which opens into the relevant end face and is only subsequently closed by the closure plate 26 having the exhaust gas inlet opening 20. The opening into the gas inlet opening 20 or through this outwardly extending inlet pipe section 24th can thus be connected from the outset firmly with the support member 32, whereby a subsequent welding within the shell 14 is omitted. Everything can now be welded together. Due to the shell-side inlet of the exhaust gas transverse installation of the muffler 10 in the relevant motor vehicle is possible.

The closure plate 26 may in particular also be made larger than the recess 28, whereby a secure closing of the recess 28 is ensured and the stability is increased.

The closure plate 26 may in particular also be made thicker than the jacket 14, whereby the stability is further increased.

It is also conceivable, in particular, such an embodiment in which the closure plate 26 with a collar 34 (see, in particular Fig. 4 ) is provided. If the inlet pipe piece 24 extends outwardly through the exhaust gas inlet opening 20, as in the present exemplary embodiment, this collar 34 can surround at least part of the end of the inlet pipe piece 24 extending outward through the exhaust gas inlet opening 20. In principle, however, such a collar is also conceivable when the inlet pipe section 24 opens into the exhaust gas inlet opening 20.

As based on the Fig. 1 and 2 can be seen, the insert 30 except the inlet pipe piece 24 one or more further, in particular fixedly connected to the support member 30, further described in detail below pipe pieces.

Between the support member 30 and the closure plate 26 adjacent the first end wall 16, a first chamber 36, in particular Reflection chamber, and between the support member 30 and the second end wall 18, a second chamber 38, in particular resonance chamber, be formed.

In addition, the support element 30 may comprise, in particular, two partitions or inner bottoms 40, 42 spaced apart from one another in the longitudinal direction of the housing L, between which a third chamber 44, in particular an absorption chamber, is formed.

The partition wall 40 provided between the first and the third chamber 36 or 44 has in the present case a perforation 46 (cf. Fig. 5 ), via which the first chamber 36 communicates with the third chamber 44. In contrast, provided between the second and the third chamber 38 and 44 partition wall 42 is not perforated.

The inlet pipe piece 24 may have a perforation 48, via which it is connected to the first chamber 36.

The insert 30 may include one or more further, in particular fixedly connected to the support member 32 pipe sections 50, 50 ', which are each connected via a perforation 52 to the first chamber 36, through the support member 32 and the third chamber 44 and through the second chamber 38 extend therethrough and each in a provided in the second end wall 18 gas outlet opening 22 and 22 'open. In the present embodiment, two such pipe sections 50, 50 'are provided. In principle, however, only such a further pipe section opening into a gas outlet opening can be provided. In addition, in principle more than two such each opening into a gas outlet opening further pipe sections may be provided.

The inlet tube piece, the support member 32 and the third chamber 44 pass through and open with its second end in the second chamber 38, as is the case in the present embodiment.

The insert 30 can also comprise a resonance tube piece 54 which is inserted at one end into the second end of the inlet tube piece 24 and opens at its other end into the second chamber 38, which is preferably designed as a resonance chamber.

As in particular on the basis of Fig. 1 can be seen, this resonance tube piece 54 may be supported in the second chamber 38 via at least one connecting element 56 at least one in a gas outlet opening 22, 22 'opening pipe section 50, 50'.

As again with the help of Fig. 1 It can be seen, the resonance pipe section 54 has a smaller cross-section than the inlet pipe piece 24. It passes through a provided in the partition wall opening 58 into the inlet pipe piece 24. The resonance pipe piece 24 is thus held on the one hand in the opening provided in the partition wall 42 and on the other hand via the connecting element 56 on at least one of the pipe sections 50, 50 'supported, whereby it again fixed relative to the support member 32.

Fig. 3 shows the muffler 10 in a schematic end view, in which the two exhaust gas outlet openings 22, 22 'can be seen, in each of which one of the two pipe sections 50, 50' opens.

In the Fig. 3 Among other things, the point 60 is awarded, on which the jacket 14 is longitudinally folded and / or welded.

Fig. 4 shows a schematic cross-sectional view of the muffler 10, taken along the line CC of Fig. 1 , As in particular on the basis of this Fig. 4 can be seen, the closure plate 26 may be enlarged not only relative to the recess 28, but for example, be provided with a collar 34 which encloses at least a portion of here, for example, through the exhaust inlet opening 20 to the outside extending end of the inlet tube piece 24. However, as already mentioned, such a collar 34 is basically also conceivable when the inlet pipe piece 24 opens into the exhaust gas inlet opening 20.

Fig. 5 shows a further schematic cross-sectional view of the muffler 10, taken along the line AA Fig. 2 , In this case, in addition to the inlet pipe piece 24 and the two pipe sections 50, 50 'in particular, the perforation 46 of the partition 40 can be seen.

Fig. 6 shows a further schematic cross-sectional view of the muffler 10, taken along the line BB of Fig. 2 , Based on this Fig. 6 it can be seen in particular that the partition wall 42 provided between the second chamber 38 and the third chamber 44 is designed without perforation. Moreover, in this illustration again the inlet pipe piece 24 and the two pipe sections 50, 50 'can be seen. The support member 32 may include a particular 62 of sound-absorbing material molding.

The silencer according to the invention can be produced or mounted in particular by virtue of the fact that the silencer elements, including the inlet pipe piece 24, which are to be accommodated at least substantially in the housing 12, are separated from the insert 30 as a particularly dimensionally stable insert 30 Mantle be prefabricated 14 that the jacket 14 is made with a opening into a mantle end recess 28 that a the exhaust inlet opening 20 having closure plate 26 is made separately from the jacket 14 that the insert 30 of a adjacent to the recess 28, then by a End wall 16 closable shell side forth in the longitudinal direction L of the housing 12 is inserted into the shell 14 and that provided in the shell 14 recess 28 is then closed by the exhaust gas inlet opening 20 having closure plate 26, wherein the closure plate 26 connected to the jacket 14, in particular welded becomes. The opening into the exhaust gas inlet opening 20 or extending therethrough outwardly extending end of the inlet pipe piece 24 may be connected after insertion of the insert with the closure plate 26, in particular welded. In principle, it is also conceivable to connect the closure plate in advance with the respective end of the inlet tube piece. However, a bonding after insertion of the insert into the jacket is preferred.

As based on the FIGS. 1 and 2 can be seen, the inlet pipe piece 24 may in particular comprise a generally in the longitudinal direction L of the housing 12 extending portion and a bent-off to the shell side portion.

In the present exemplary embodiment, the pipe section 24 to be connected via the closure plate 26 to the jacket 14 is an inlet tube piece. In principle, however, such an embodiment of the muffler 10 according to the invention is possible, for example, in which this pipe section 24 forms a Eintrittsrohstück. The exhaust gas inlet opening 20 is then corresponding to the exhaust gas outlet opening, while the exhaust gas outlet openings 22, 22 'are corresponding to exhaust gas inlet openings.

LIST OF REFERENCE NUMBERS

10

silencer

12

casing

14

coat

16

first end wall

18

second end wall

20

Exhaust gas inlet opening

22

Exhaust gas outlet opening

22 '

Exhaust gas outlet opening

24

Inlet pipe piece

26

closing plate

28

recess

30

commitment

32

support element

34

collar

36

first chamber

38

second chamber

40

Partition, inner floor

42

Partition, inner floor

44

third chamber

46

perforation

48

perforation

50

pipe section

50 '

pipe section

52

perforation

54

Resonance pipe section

56

connecting element

58

opening

60

folding site

62

molding

L

longitudinal direction

Claims (15)

Silencer (10), in particular rear silencer, for an exhaust system of an internal combustion engine, in particular a motor vehicle engine, comprising a housing (12) comprising a shell (14) and two end walls (16, 18), at least one exhaust gas inlet opening and at least one exhaust gas outlet opening, and at least substantially in the housing (12) housed silencer elements,
characterized,
in that the silencer elements accommodated at least substantially in the housing (12) comprise an inlet or outlet pipe piece (24) which opens with a first end into a shell-side exhaust gas inlet opening (20) of the housing (12) or out through this extends, and that this Abgaseintritts- or exhaust gas outlet opening (20) in a separate from the jacket (14) made, then connectable with this closure plate (26) is provided by a in the shell (14) provided, in a shell end opening opening ( 28) is closable. Silencer according to claim 1,
characterized,
in that the silencer elements accommodated at least substantially in the housing (12), including the inlet or outlet pipe section (24), are designed as a prefabricated, in particular dimensionally stable insert, separate from the jacket (14),
wherein the at least substantially in the housing (12) to be accommodated muffler elements comprehensive insert (30) of the recess (28) adjacent, then by a first end wall (16) closable shell front side in the longitudinal direction (L) of the housing (12) in the jacket (14) can be inserted and / or the separately from the jacket (14) prefabricated insert (30) in a sliding fit into the shell (14) insertable support member (32), with which the inlet or outlet pipe piece (24) is firmly connected. Silencer according to one of the preceding claims,
characterized,
that the inlet and outlet pipe piece (24) can be connected via the closure plate (26) with the jacket,
wherein preferably the insert (30) via the connection of the inlet or outlet pipe section (24) with the closure plate (26) and the connection of the closure plate (26) with the jacket (14) in the jacket (14) is fixable. Silencer according to one of the preceding claims,
characterized,
in that the inlet or outlet tube piece (24) is welded to the closure plate (26) and / or that the closure plate (26) is welded to the jacket (14). Silencer according to one of the preceding claims,
characterized,
is that the casing (14) longitudinally folded and / or welded. Silencer according to one of the preceding claims,
characterized,
in that at least the first end wall (16) is welded to the casing (14). Silencer according to one of the preceding claims,
characterized,
that the closure plate (26) is made larger than the recess (28) and / or that the closure plate (26) is made thicker than the casing (12). Silencer according to one of the preceding claims,
characterized,
that the closure plate (26) is provided with a collar (34),
wherein the collar (34) preferably encloses at least part of the end of the inlet or outlet pipe piece (24) extending outwardly through the exhaust gas inlet or exhaust outlet opening (20) and / or that the insert (30) except the inlet or outlet pipe The outlet tube piece (24) comprises one or more further tube pieces fixedly connected to the support element (30). Silencer according to one of the preceding claims,
characterized,
that between the support member (30) and the closure plate (26) adjacent the first end wall (16) a first chamber (36), in particular reflection chamber and between the support member (30) and the second end wall (18) a second chamber (38) , in particular resonance chamber, is formed,
in which preferably the support element (30) has two partitions (40, 40) spaced apart from one another in the housing longitudinal direction (L). 42), between which a third chamber (44), in particular absorption chamber, is formed. Silencer according to one of the preceding claims,
characterized,
in that the partition wall (40) provided between the first and the third chamber (36 or 44) has a perforation (46) via which the first chamber (36) communicates with the third chamber (44), and / or the partition wall (42) provided between the second and third chambers (38 and 44, respectively) is not perforated. Silencer according to one of the preceding claims,
characterized,
in that the inlet or outlet tube piece (24) has a perforation (48) via which it is connected to the first chamber (36). Silencer according to one of the preceding claims,
characterized,
in that the insert (30) comprises one or more further tube pieces (50, 50 ') fixedly connected to the support element (32), each of which is connected to the first chamber (36) via a perforation (52). 32) and the third chamber (44) as well as through the second chamber (38) extend therethrough and each in a provided in the second end wall gas outlet or gas inlet opening (22, 22 ') open. Silencer according to one of the preceding claims,
characterized,
in that the inlet or outlet tube piece (24) passes through the support element (32) or the third chamber (44) and opens with its second end into the second chamber. Silencer according to one of the preceding claims,
characterized,
in that the insert (30) comprises a resonance tube piece (54) having one end inserted into the second end of the inlet or outlet tube piece (24) and with its other end opening into the second chamber (38) designed as a resonance chamber,
wherein preferably the resonance tube piece (54) in the second chamber (38) via at least one connecting element (56) on at least one in a gas outlet or gas inlet opening (22, 22 ') opening tubular piece (50, 50') is supported. Method for producing a silencer according to one of the preceding claims,
characterized,
in that the silencer elements to be accommodated at least substantially in the housing (12), including the inlet or outlet pipe piece (24), are prefabricated as a dimensionally stable insert (30) separate from the jacket (14), that the jacket (14) opens with an opening into a jacket end face Recess (28) is made, that a the Abgaseintritts- or exhaust gas outlet opening (20) having closure plate (26) is made separately from the jacket (14) that the insert (30) of a to the recess (28) adjacent, then by an end wall (16) closable shell end side in the longitudinal direction (L) of the housing (12) in the shell (14) is inserted and that in the shell (14) provided recess (28) then by the exhaust gas inlet or the exhaust gas outlet opening (20) having closure plate (26) is closed, wherein the closure plate (26) connected to the jacket (14), in particular welded.

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