EP2375017A2 - Method for manufacturing an automobile muffler and automobile muffler - Google Patents

Abstract

The method involves inserting an end pipe (18) on or in a support plate (24) of a muffler insert (20) through a recess in the compressed jacket (16), and attaching the end pipe at the compressed jacket while maintaining the generated plug-in connection. The end pipe is inserted on a socket (32) of the support plate or in an opening of the support plate. An independent claim is also included for a vehicle muffler comprises a housing.

Description

The invention relates to a method for producing a vehicle silencer with a housing which comprises opposite outer end walls and a winding jacket formed by winding a sheet metal part, and at least one silencer insert in the interior of the housing. Furthermore, the invention relates to a vehicle silencer itself.

An above-mentioned vehicle muffler is for example from the EP 1 888 891 B1 known, in which exhaust pipe connections extend through the peripheral wall into the silencer interior and are positively secured by mechanical deformation of the silencer insert. In order to enable mechanical deformation of the exhaust pipe connections inside the muffler, a tool must be introduced from the outside into the interior of the exhaust pipe connection and deform the exhaust pipe connection from the inside. Such a method is expensive and therefore expensive. Due to the deformation with the tool in the interior of the exhaust pipe connection only short pipe sections can be attached as exhaust pipe connections to the vehicle muffler, which in turn must be connected to the exhaust pipes.

The object of the invention is to provide a simple and cost-effective method for producing a vehicle silencer, in which at least one tube extends through the peripheral wall into the silencer interior, in wound construction and such a cost-effective silencer.

This is achieved by a method for producing a vehicle silencer with the features of claim 1. The inventive method for producing a vehicle muffler mentioned above comprises the steps that a tail pipe through a recess in the winding shell on or in a support plate of the muffler insert or connected to the support plate inner tube is plugged to create a connector, and that the tail pipe while maintaining the generated Plug connection at Winding jacket is attached. The interaction of the connector of tailpipe and muffler insert with the attachment of the tailpipe on the winding jacket allows a sufficient connection of the tailpipe with the vehicle muffler, without an additional complex processing of the tailpipe is necessary. In the area of the connector there is no further connection of the parts. In this way, the production of the vehicle muffler is simple and inexpensive. Another advantage lies in the design of the connector, which is very easy to implement and certain degrees of relative movement of the pipe and the muffler insert allow or limit, thereby possible mechanical stresses, for example, in temperature differences in the vehicle muffler can be avoided. Since it is not necessary to introduce a tool inside the tailpipe, any length and arbitrarily shaped tubes can be used as tailpipes. In particular, the pipes of an exhaust system can be connected directly to the vehicle silencer.

Preferably, the tail pipe is placed on a neck of the support plate or in an opening of the support plate. In this way, the tailpipe is positioned radially in the plane of the support plate.

It is possible for the tailpipe to have a taper at the pipe end, preferably a conical taper, with the tailpipe being inserted with the taper into the opening of the support plate. In this way, on the one hand the positioning of the tailpipe can be facilitated, and on the other hand, a tolerance compensation between the pipe diameter and the diameter of the opening of the support plate is made possible in a simple manner.

It is also possible that the tailpipe has a widening, preferably a conical widening, at the pipe end.

The support plate may have an opening, in the edge region of the support plate has an at least partially extending in the direction of the recess of the winding jacket nozzle, wherein the tail pipe is placed on or in the nozzle.

It is possible that the neck has a, preferably conical, taper in the direction of the recess of the winding jacket, which also serves the play-free radial fixation of the free end of the tailpipe.

The muffler insert may have an inner tube which projects through the opening of the support plate and is connected to the support plate, wherein the inner tube forms the at least partially extending in the direction of the recess of the winding mantle. In this way, the tailpipes can be connected directly to inner tubes of the vehicle silencer, whereby different tube lengths are made possible to influence the acoustic properties of the vehicle silencer.

According to a further variant of the method, the nozzle substantially corresponds to the inner radius of the tail pipe, so that the plug connection forms an axial sliding seat. In this way, the free end of the tail pipe is axially movable.

The support plate can form a stop for the tailpipe upon insertion of the tailpipe, so that the support plate limits movement of the tailpipe in the axial direction. In this way, the support plate forms a stop when inserting the tailpipe and thus allows axial positioning of the tailpipe on the muffler insert. This is easy to realize, especially with a conically shaped part.

According to a preferred variant of the method, the tailpipe is fastened to the winding jacket by welding.

It is possible that the tailpipe has a collar and the tailpipe is fastened via the collar to the winding jacket. In this way, manufacturing tolerances between the outer cross section of the end tube and the recess of the winding jacket, through which the tail pipe is inserted, can be compensated in a simple manner.

The invention further relates to a vehicle silencer, which is produced by a method described above, with a housing which comprises opposite outer end walls and a winding jacket formed by winding a sheet metal part, at least one silencer insert and at least one tail pipe. The tailpipe extends through the winding jacket into the silencer interior, wherein the tail pipe is attached to the winding jacket and is connected by a plug connection with a support plate of the silencer insert. As already described, such a vehicle silencer is simple and inexpensive to manufacture.

Preferably, the free end of the tail pipe is axially movable at least in the direction out of the housing to the support plate. In this way, mechanical stresses, for example due to thermal expansion, reduced in the vehicle muffler.

• Figur 1 einen erfindungsgemäßen Fahrzeugschalldämpfer in Perspektivansicht;
• Figur 2 ein transparent gezeigtes Gehäuse und einen Schalldämpfereinsatz des Fahrzeugschalldämpfers gemäß Figur 1 ohne Endrohre;
• Figur 3 eine Detailansicht des Schalldämpfergehäuses mit Endrohren und einem Stützblech des Schalldämpfereinsatzes gemäß Figur 1;
• Figur 4 eine Detailansicht einer Steckverbindung gemäß einer ersten Ausführungsform der Erfindung;
• Figur 5 eine Schnittansicht des Fahrzeugschalldämpfers gemäß Figur 1 gemäß einer ersten Ausführungsform der Erfindung;
• Figur 6 den Fahrzeugschalldämpfer gemäß Figur 1 mit transparent gezeigtem Gehäuse mit Endrohren;
• Figur 7 und 7a jeweils eine Schnittansicht eines Fahrzeugschalldämpfers gemäß einer Variante einer zweiten Ausführungsform der Erfindung;
• Figur 8 und 8a eine Detailansicht der Steckverbindung des Fahrzeugschalldämpfers gemäß Figur 7 bzw. 7a;
• Figur 9 eine Schnittansicht eines Fahrzeugschalldämpfers gemäß einer dritten Ausführungsform der Erfindung;
• Figur 10 eine Detailansicht der Steckverbindung des Fahrzeugschalldämpfers gemäß Figur 9;
• Figur 11 eine perspektivische Ansicht eines Fahrzeugschalldämpfer gemäß einer vierten Ausführungsform der Erfindung;
• Figur 12 eine Draufsicht des Fahrzeugschalldämpfers gemäß Figur 11;
• Figur 13 eine Schnittansicht eines Fahrzeugschalldämpfers gemäß Figur 11;
• Figur 14 eine Detailansicht der Steckverbindung eines Fahrzeugschalldämpfers gemäß Figur 11;
• Figur 15 eine Schnittansicht eines Fahrzeugschalldämpfers gemäß einer fünften Ausführungsform der Erfindung;
• Figur 16 eine perspektivische Schnittansicht eines Fahrzeugschalldämpfers gemäß Figur 15; und
• Figur 17 eine transparent gezeigte perspektivische Schnittansicht eines Fahrzeugschalldämpfers gemäß Figur 15.

Further features and advantages of the invention will become apparent from the following description and from the following drawings, to which reference is made. In the drawings show:

• FIG. 1 a vehicle silencer according to the invention in perspective view;
• FIG. 2 a transparent shown housing and a muffler insert of the vehicle muffler according to FIG. 1 without tailpipes;
• FIG. 3 a detailed view of the muffler housing with tailpipes and a support plate of the muffler insert according to FIG. 1 ;
• FIG. 4 a detail view of a connector according to a first embodiment of the invention;
• FIG. 5 a sectional view of the vehicle muffler according to FIG. 1 according to a first embodiment of the invention;
• FIG. 6 the vehicle silencer according to FIG. 1 with transparent housing with tailpipes;
• FIGS. 7 and 7a each a sectional view of a vehicle muffler according to a variant of a second embodiment of the invention;
• FIGS. 8 and 8a a detailed view of the connector of the vehicle muffler according to FIG. 7 or 7a;
• FIG. 9 a sectional view of a vehicle muffler according to a third embodiment of the invention;
• FIG. 10 a detailed view of the connector of the vehicle muffler according to FIG. 9 ;
• FIG. 11 a perspective view of a vehicle silencer according to a fourth embodiment of the invention;
• FIG. 12 a plan view of the vehicle muffler according to FIG. 11 ;
• FIG. 13 a sectional view of a vehicle muffler according to FIG. 11 ;
• FIG. 14 a detailed view of the connector of a vehicle muffler according to FIG. 11 ;
• FIG. 15 a sectional view of a vehicle muffler according to a fifth embodiment of the invention;
• FIG. 16 a sectional perspective view of a vehicle muffler according to FIG. 15 ; and
• FIG. 17 a transparent sectional perspective view of a vehicle muffler according to FIG. 15 ,

In FIG. 1 a transverse vehicle muffler 10 for an exhaust system of a vehicle is shown. The muffler has a housing 12, which consists of two opposite outer end walls 14 and a winding jacket 16 formed by winding a sheet metal part.

The vehicle silencer 10 includes a plurality of end pipes 18 which extend through the winding jacket 16 into the interior of the housing 12.

FIG. 2 shows the housing 12 of the vehicle muffler 10 transparent. Inside the vehicle silencer 10, a silencer insert 20 shown schematically is provided, which comprises two inner end walls 22 and a support plate 24. The support plate 24 is located between two inner end walls 22, to which it is attached, and extends in the axial direction.

In the winding jacket 16 of the housing 12 of the vehicle muffler 1 D two recesses 26 are provided through which the tailpipes 18 are inserted.

The support plate 24 is arranged in the muffler insert 20 so that the plane of the support plate 24 extends perpendicularly in the direction of the recess 26 of the winding jacket 1 E.

FIG. 3 The tailpipe 18 extends through the recess of the winding jacket 16 into the interior of the housing 12 of the vehicle muffler 1 D. The pipe end 28 of the tail pipe 18 is in particular perpendicular to the support plate 24th , which in this region has an opening 30, in the edge region of the support plate 24 has an at least partially in the direction of the recess 26 of the winding jacket 16 extending nozzle 32, wherein the tail pipe 18 is placed on the nozzle 32. The nozzle 32 is preferably produced by forming the support plate 24.

A detailed view of the connector according to a first embodiment is shown in FIG FIG. 4 shown. The nozzle 32 of the support plate 24 has a conical taper in the direction of the recess 26 of the winding jacket 16. The cylindrical end pipe 18 is inserted with its tube end 28 on the conical nozzle 32 of the opening 30 of the support plate 24 until it comes to the axial stop. The plug connection of the end tube 18 and the support plate 24 thus enables a positioning of the end tube 18 in the interior of the housing 12 in the plane of the support plate 24 and in the axial direction of the end tube 18 in the direction of the support plate 24th

FIG. 5 shows a further sectional view of the vehicle muffler 10 with a schematically shown weld joint 34, via which the tail pipe 18 is secured in the recess 26 of the winding jacket 16. The fastening by the welded connection 34, which is produced after the insertion of the end tube 18, in particular prevents an axial movement of the end tube 18 relative to the winding jacket 16 of the housing 12 of the vehicle silencer 10.

FIG. 6 shows a further view of the vehicle muffler 10 with transparently shown housing 12 and mounted tailpipes 18th

In the FIGS. 7, 7a and the FIGS. 8, 8a are sectional views of two variants of a vehicle muffler 10 according to a second embodiment of the invention shown_ The second embodiment differs from the first embodiment in that the support plate 24 has no nozzle 32 but only an opening 30 into which the tailpipe 18 is inserted.

In the in the FIGS. 7 and 8 shown variant of the second embodiment, the cross section of the opening 30 is smaller than the outer cross section of the tail pipe 18 and the tail pipe 18 has at the pipe end 28 a conical taper, wherein the tail pipe 18 is inserted with the taper in the opening 30 of the support plate 24. The connector in turn forms a positioning of the end tube 18 in the plane of the support plate 24 and the support plate 24 serves as a stop for the free end of the tube 28 of the end tube 18 in the axial direction.

The second variant of the second embodiment is in the FIGS. 7a and 8a shown, wherein the cross section of the opening 30 of the support plate 24 corresponds to the outer cross section of the tail pipe 18.

In FIG. 9 and FIG. 10 a third embodiment of the vehicle muffler 10 is shown in which the plug connection of the support plate 24 and the end tube 18 forms an axial sliding fit. The opening 30 of the support plate 24 has a nozzle 32 extending in the direction of the recess 26 of the winding jacket 16, which essentially corresponds to the inner radius of the end tube 18. The connector allows movement of the free end of the tail pipe 18 in the axial direction. Since the nozzle 32 extends within the tailpipe 18, the support plate 24 simultaneously forms a stop for the pipe end 28 of the tailpipe 18 and defines a maximum extent of the tailpipe 18 in the interior of the housing 12 of the vehicle muffler 10.

It is also possible that the taper of the nozzle 32 in FIG. 4 is formed in a different manner, in particular, the diameter of the nozzle 32 could widen in the direction of the recess 26 of the winding jacket 16 out, and the tailpipe 18 could be inserted with its pipe end 28 in the nozzle 32.

In the FIGS. 11 to 14 a fourth embodiment of the invention is shown in which an inner tube 36 of the muffler insert 20 extends through the opening 30 of the support plate 24 and is connected thereto, so that the inner tube 36 forms a at least partially in the direction of the recess 26 of the winding jacket 16 extending nozzle 32 ,

FIG. 11 and FIG. 12 show a vehicle muffler 10 with two tailpipes 18, wherein the left tail pipe 18 is connected to the support plate 24 with an inner tube 36. Through the inner tube 36, the tube length of the left end tube 18 is extended, and the two end tubes 18 thus have different tube lengths.

Analogous to the embodiment of the FIGS. 9 and 10 is in the embodiment of FIG. 11 the tailpipe 18 is placed on the nozzle 32, wherein a sliding seat connection is formed. It is also possible that a different type of connector between the nozzle 32 of the inner tube 36 and the tailpipe 18 is formed.

Support plate 24 and inner tube 36 may in particular be positively connected, for example as a plug connection, or cohesively, for example via a welded connection.

The connector of the tail pipe 18 with the inner tube 36, which forms the nozzle 32, allows the formation of different pipe lengths of different tailpipes, whereby the acoustic properties of the vehicle muffler 10 can be changed.

The FIGS. 15 to 17 show a fifth embodiment in which collar 38 are attached to the outer surfaces of the tailpipes 18. The collar 38 serve, for example, to compensate for manufacturing tolerances between the outer diameters of the tailpipes 18 and the oversized recesses 26 in the winding jacket 16, through which the tailpipes 18 are inserted. The collar 38 can also be used for easier attachment of the tailpipe 18 on the winding jacket 16.

In the following, an inventive method for producing the vehicle muffler 10 on the basis of Figure 2-5 described.

At the beginning of the manufacturing process, a vehicle muffler housing 12 is provided with a muffler insert 20 in the interior of the housing 12 in winding construction. For this purpose, for example, a sheet metal part is wound around the muffler insert 20 and the outer end walls 14 and welded together.

The muffler insert 20 is formed so that the openings 30 of the support plate 24 are aligned with the recesses 26 of the winding jacket 16.

In a subsequent process step, as in FIG. 3 shown, the end pipes 18 inserted through the recesses 26 in the winding shell 1B on the support plate 24 of the muffler insert 20 to the in FIG. 4 To create shown connector. By the connector, the tail pipe 18 is positioned in the plane of the support plate 24 and in the axial direction. The connector is then not changed, ie tailpipe 18 and support plate 24 remain without further processing.

In a final process step, as in FIG. 5 shown attached to each tailpipe 18 by welding on the winding shell.

The manufacturing method for the other embodiments according to the FIGS. 7 and 8 or 7a and 8a, 9 and 10 or 11 to 14 is analogous to the manufacturing method described above, wherein in the third and fourth embodiments, the connector is preferably formed so that a movement of the pipe end 28 of the tailpipe 18 axially in both directions is possible.

In the fifth embodiment, according to FIGS. 15 to 17 , Collar 38 are attached to the tailpipes 18 before inserting the end pipes 18 into the recesses 26 of the winding jacket 1fi. After making the connector, the tailpipes 18 are attached via the collar 38 on the winding jacket 16. The collar 38 can be firmly connected to the tailpipes 18 when attaching to the tailpipes 18 or only when attaching the tailpipes 18 on the winding shell 16th

In the embodiments shown, tailpipes with a circular cross-section are respectively shown. However, other cross-sectional shapes for the End pipes 18, the opening 30 and the nozzle 32 may be provided, in particular oval cross-sections or polygonal-shaped cross-sections, for example parallelogram-shaped cross sections.

The shape of the opening 30 and the neck 32 of the support plate 24 and the type of taper is of course adapted to the respective cross sections of the tailpipes 18.

By the taper of the nozzle 32 in the first embodiment or by the taper of the end tube 18 in the third embodiment, a tolerance compensation between the cross section of the end tube 18 and the cross section of the opening 30 of the support plate 24 is possible.

Claims (12)

Method for producing a vehicle silencer (10), having a housing (12) which has opposite outer end walls (14) and a winding jacket (16) formed by winding a sheet metal part, and at least one silencer insert (20) in the interior of the housing (12) .
characterized by the following steps: a) inserting a tail pipe (18) through a recess in the winding jacket (16) on or in a support plate (24) of the muffler insert (20) or with the support plate (24) connected to the inner tube (36) to provide a connector and b) securing the tailpipe (18) while maintaining the connector produced on the winding jacket (16). A method according to claim 1, characterized in that the tail pipe (18) is placed on a neck (32) of the support plate (24) or in an opening (30) of the support plate (24). A method according to claim 2, characterized in that the tail pipe (18) at the pipe end (28) has a taper, preferably a conical taper, wherein the tail pipe (18) inserted with the taper in the opening (30) of the support plate (24) becomes. Method according to one of the preceding claims, characterized in that the support plate (24) has an opening (30) in the edge region of the support plate (24) at least partially in the direction of the recess (26) of the winding jacket (16) extending nozzle (32 ), wherein the tail pipe (18) is placed on or in the neck (32). Method according to one of claims 2 to 4, characterized in that the nozzle (32) has a, preferably conical, taper in the direction of the recess (26) of the winding jacket (16). Method according to one of claims 2 to 4, characterized in that the neck (32) is substantially the inner radius of the End tube (18) corresponds, so that the connector forms an axial sliding seat. Method according to one of claims 2 to 6, characterized in that the muffler insert (20) has an inner tube (36) which projects through the opening (30) of the support plate and is connected to the support plate, wherein the inner tube (36) at least partially in the direction of the recess (26) of the winding jacket (16) extending connecting piece (32). Method according to one of the preceding claims, characterized in that the support plate (24) upon insertion of the end tube (18) forms a stop for the tail pipe (18), so that the support plate (24) limits movement of the tail pipe (18) in the axial direction , Method according to one of the preceding claims, characterized in that the tailpipe (18) is fastened to the winding jacket (16) by welding. Method according to one of the preceding claims, characterized in that the tail pipe (18) has a collar and wherein the tail pipe (18) is fastened via the collar to the winding jacket (16). A vehicle muffler (10) produced by a method according to any one of the preceding claims, comprising a housing (12) having opposite outer end walls (14) and a winding jacket (16) formed by winding a sheet metal part, at least one muffler insert (20) and at least an end tube (18) which extends through the winding jacket (16) into the silencer interior, wherein the tail pipe (18) is fastened to the winding jacket (16) and is connected by a plug connection to a support plate (24) of the silencer insert (20). Vehicle silencer according to claim 11, characterized in that the free end of the end tube (18) is axially movable at least in the direction of the housing {12} out to the support plate (24).

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