EP0926320B1 - Method for manufacturing an absorption silencer - Google Patents

Description

The invention relates to a method for producing an absorption silencer for motor vehicles with a Schalldämfungsmaterial arranged in the muffler body, and a Hiernach produced absorption muffler in half-shell or winding construction itself, wherein introduced into a cavity of the muffler body sound damping material in the form of glass wool as an expanded endless fiberglass invention becomes.

As is known, absorption silencers have annular gaps and / or chambers in which the sound damping material, in particular glass wool, is arranged. The sound deadening material is applied around the semifinished product of an inner shell or around an inner tube before the outer shell is finally mounted and secured to the inner shell or inner tube, e.g. connected via a fold or a weld. The arrangement of the incompatible flexible sound damping material at the designated locations or in the chambers provided for this purpose a muffler and the subsequent assembly of the muffler body are relatively laborious and costly.

The object of the invention is to provide a simplified method for producing an absorption silencer with the aid of simple means and according to one To create silencers in a simple way.

The problem is solved by a manufacturing method specified in claim 1 Art.

This method is advantageously further developed by the features of claims 2 to 8.

A manufactured according to the inventive absorption silencer is characterized by the features of claim 9.

The muffler is advantageously further developed by the features of claims 10 to 13.

Essence of the inventive method for producing an absorption silencer is that the sound damping material, namely glass wool, in the completely prefabricated and fully assembled silencer body, namely in the end product, is subsequently introduced from the outside.

Although it is known from EP 091 413 B2 to produce a muffler of the type mentioned, in which glass wool is introduced as an expanded endless glass fiber spun into the muffler body. The introduction of the glass wool but does not take place in the end of a completely prefabricated, composite muffler body, but on a fully open end of the muffler or by a circumferential gap of a partially assembled muffler body. If the glass wool filled, the end wall of the muffler is used or the coaxial sound body inside part completely inserted into the outer part of the sound body to close the front side or the circumferential gap. The subsequent insertion of the sound body inner part in the outer part is relatively expensive and not uncomplicated. The wrapped glass wool can cause assembly obstruction or jamming.

In contrast, in the invention by the prefabricated complete construction of the muffler body to be filled with glass wool interior exactly predetermined and can be packed into the last corner with glass wool without obstruction or jamming as in the aforementioned prior art occurs as no final assembly of Muffler body must be done after filling more.

In a further development of the invention, it is provided to introduce the glass wool by means of at least one rigid filler pipe or a flexible filler hose via one or more formed in the muffler body filling openings, wherein the filling openings may be provided at different locations depending on the type of construction of the muffler, namely on the outer shell or on the Outer skin, and / or on the inner shell or on the inner tube, namely at the radial (mantle) position and / or at the axial end-side location of the outer shell and / or the inner tube or in the inner shell. As a result, even more complicated cavities can be packed into the last corner easily, quickly and, in particular, at the same density with glass wool. The (small) filling openings can be easily closed again after pulling out the filler pipe or filling hose.

The glass wool is preferably pressed under pressure through the filler pipe or the filling hose into the muffler body and / or sucked in through a vacuum in the interior of the muffler body.

The filling openings are expediently before or after formed a composite of a muffler body and closed again after introduction of the sound damping material.

In particular, the outer skin or the outer shell of the muffler body is cut to form the filling opening, and the cut-in portion is deformed, so that a filling gap is formed. After introduction of the glass wool, the deformed incised portion is reformed again and optionally welded to the remainder of the outer skin or outer shell.

In particular, a gap between an inner tube and an outer skin or outer shell of a muffler body that is partially bulged on the circumference at the end can be pushed back again and, if necessary, welded after introduction of the muffling material.

Also, an inner tube partially deformed inwards on the circumference, after the glass wool has been introduced, can be returned to its original, preferably round shape.

In particular, after an introduction of the glass wool into the muffler body, a hole or a jacket perforation in the inner shell or in the inner tube can be closed again by inserting an intermediate tube into the inner shell or into the inner tube. The hole or holes are pressure equalization holes, which get the pressure equalization when filling the glass wool. The holes may also be used to fill the interior with glass wool.

In an inventively manufactured absorption silencer in half-shell or wound construction is thus in the completely prefabricated and completely assembled silencer body subsequently introduced from the outside silencer material provided in the form of glass wool.

The outer skin or outer shell has at least one filling opening through which the glass wool is introduced and which is closed after introduction of the glass wool.

The filling opening of a subsequently provided with glass wool muffler body may have a welded closure in the form of a welded plug or alternatively a riveted closure.

The muffler body provided with glass wool may have a pressed outer shell or an at least partially compressed outer shell, which is optionally still welded.

A frontally deformed inner shell or a frontally deformed inner tube of a silencer body provided with glass wool is expediently reshaped, preferably with the aid of a mandrel.

The inner shell or the inner tube of the muffler body expediently has a hole or a jacket perforation for a pressure equalization during filling of the glass wool, which is closed after an insertion of the glass wool through an inserted intermediate tube. The hole or jacket perforation may also be used to introduce the glass wool into the interior of the muffler.

It is therefore according to the invention glass wool in a muffler body after folding and welding from the outside via one or more holes by means of a probe or a filling hose or tube introduced. Then the holes are closed. Such a manufacturing process saves manufacturing time and assembly time compared to the known methods mentioned above, resulting in competitive advantages. The glass wool as filler results in a good environmental compatibility (better than when using basalt wool).

Fig. 1

eine Einfüllöffnung in einer Außenschale eines Schalldämpfers in Halbschalenbauweise mit einem verschweißten Verschluß in Form eines angeschweißten Stopfens,

Fig. 2

eine Einfüllöffnung wie in Figur 1 mit einem vernieteten Verschluß,

Fig. 3

eine dritte Einfüllöffnung in Form eines aufgebogenen Einschnitts in der Außenschale des Schalldämpferkörpers,

Fig. 4

einen Schalldämpferkörper in einem Querschnitt mit Ausbildung eines Einfüllkanals bzw. Spalts im Bereich der Außenschale,

Fig. 5

den Schalldämpferkörper nach Figur 4 in einem Querschnitt, links, längs A-A des Längsteilschnitts, rechts, mit Ausbildung eines Einfüllkanals bzw. Spalts im Bereich der Innenschale bzw. des Innenrohrs durch Verformung des Innenrohrs,

Fig. 6

einen Axialteilschnitt durch einen Schalldämpfer- körper in anderer Ausführungsvariante,

Fig. 7

einen Schalldämpfer in Schalenbauweise in aufgebrochener Seitenansicht mit Darstellung zweier Einfüllrohre,

Fig. 8

den Schalldämpfer nach Fig. 7 in einem schematischen Querschnitt im Bereich der Einfüllrohre,

Fig. 9

einen Schalldämpfer in Wickelbauweise in einem schematischen Längsquerschnitt mit Darstellung zweier Einfüllrohre, und

Fig. 10

den Schalldämpfer nach Fig. 9 in einer Stirnansicht.

The invention will be described in more detail below by means of embodiments with reference to the accompanying drawings; show it:

Fig. 1

a filling opening in an outer shell of a silencer in half shell construction with a welded closure in the form of a welded plug,

Fig. 2

a filling opening as in FIG. 1 with a riveted closure,

Fig. 3

a third filling opening in the form of a bent cut in the outer shell of the muffler body,

Fig. 4

a muffler body in a cross section with formation of a filling channel or gap in the region of the outer shell,

Fig. 5

the silencer body of Figure 4 in a cross section, left, along AA of the longitudinal section, right, with formation of a filling channel or gap in the region of the inner shell and the inner tube by deformation of the inner tube,

Fig. 6

an axial section through a silencer Body in another embodiment,

Fig. 7

a silencer in shell construction in a broken side view showing two filling tubes,

Fig. 8

7 shows the muffler according to FIG. 7 in a schematic cross section in the region of the filler pipes, FIG.

Fig. 9

a muffler in winding construction in a schematic longitudinal cross-section with representation of two filling pipes, and

Fig. 10

the silencer of FIG. 9 in an end view.

Referring to Figs. 1 to 8, an absorption silencer comprises a shell-type silencer body 1. In particular, the muffler has two outer half shells 4 and a closed inner tube. 5

Between the two outer shells 4 and the inner tube 5 is located at an unspecified point of interest an absorption chamber with sound damping material in the form of glass wool. 2

The glass wool 2 is subsequently introduced into the completely prefabricated and final muffler body 1 from the outside, by means of a probe or a rigid filling tube 15 or a flexible filling hose with or without end-mounted nozzle. The filling tube 15 is inserted for filling the cavity 13 in a previously formed filling opening 3 of the Schalldämfungskörpers 1 and then packed endless fiberglass material under pressure from a reservoir or of a glass wool coil in the silencer interior, under expansion and confusion of the glass fibers to a so-called Glasfasergespinst, such that the entire cavity to be filled 13 is filled to the last angle with virtually the same density. After introducing the glass wool, the filling tube 15 is pulled out of the filling opening and the filling opening closed again.

The muffler partially shown in Figures 4 to 6 thus has a completely prefabricated muffler body 1 in the form of an inner tube 5, which is surrounded by the two outer half shells 4, inner tube 5 and outer shells 4 by a fold 12 in the outer shells 4 fixed to each other are connected. In a Axialmittelbereich between the inner tube 5 and the outer shells 4 is a glass wool 2 aufzufüllender cavity 13th

The filling opening 3 can be designed differently.

On the one hand, the filling opening 3 may be a bore formed in the outer shell 4, which is closed again after introduction of the glass wool, e.g. by a welded closure 10 in the form of a plug welded to the outer shell 4, as shown in Figure 1, or by a riveted closure 11, as illustrated in Figure 2.

The filling opening can also be produced by a U-shaped cut in the outer shell 4, as shown in FIG. After being cut, the cut-in section 6 is deformed or bent to finally form the filling opening 3. After introduction of the glass wool 2, the bent-up section 6 is reshaped and welded.

Next, the filling opening 3 by a deformation of the Outer shells 4 may be formed in the region of an axial end of the outer shells 4, so that a gap 7 or a filling channel according to Figure 4 is formed, through which glass wool 2 can be introduced into the silencer interior. After introducing the glass wool, the deformation of the two outer shells 4 is again formed back, by compressing the two outer shells in the local area, so that the gap 7 and the filling channel is closed again. Optionally, the bent portion of the two half-shells is still spot or seam welded to produce a proper tightness and strength of the muffler.

Not only the outer shell 4, but also the inner shell or the inner tube 5 may alternatively be deformed radially inward in an axial end portion of the outer shells 5 to form the filling opening 3. After filling the glass wool, the deformed inner tube 5 is again bent exactly round to close the filling opening at the axial end of the outer shells 4 again.

Finally, the inner shell or the inner tube 5 can also have a hole 3 or 8 on the shell side or a perforation, which can be used to fill the cavity 13 with glass wool 2. The hole or the jacket perforation is closed again after filling by an intermediate tube 9 coaxially inserted into the inner tube 5 is tightly fitting and axially fixed. The last-mentioned hole 8 can also be used as a pressure compensation bore when filling from another filling opening.

It should be noted that the filling opening 3 on the outer shell 4 shell side according to the figures 1, 2 or 3 or frontally according to Figure 4 may be formed. Furthermore, the filling opening 3 on the inner shell or in the inner tube. 5 shell side according to Figure 6 or frontally be located in accordance with Figure 5.

Despite the complete construction of the muffler body, even inaccessible internal cavities 13 can be packed satisfactorily and simply subsequently with glass wool.

In the figures 7 and 8, a shell muffler is shown, which has such cavities 13, which can be filled simultaneously or successively by two or a filler pipe 15 at the front and shell side.

It should be pointed out that a single cavity 13 can be filled simultaneously or successively at a plurality of filling points via filling openings provided there. So it is ensured in any case that every angle of the cavity is filled without hesitation.

In Figures 9 and 10, a winding muffler is shown, which also has a plurality (here frontal) filling openings, through which a filling or packing of cavities 13 is possible via filling pipes 15.

Claims (13)

1. Method for manufacturing an absorption silencer for motor vehicles, with a silencer material which is arranged in a cavity (13) of the silencer body (1) and is in the form of glass wool (2) which is introduced into the cavity (13) in the form of an expanded, endless glass fibre roving, characterized in that the silencer body (1) is completely premanufactured and assembled, and in that the glass wool (2) is subsequently introduced from the outside into the premanufactured, assembled silencer body (1).
2. Method according to Claim 1, the glass wool (2) being introduced by means of at least one rigid filling pipe (15) or a flexible filling tube via one or more filling openings (3) formed in the silencer body (1), with the filling pipe (15) or the filling tube being removed again from the filling opening (3) after the glass wool (2) is introduced.
3. Method according to Claim 2, the glass wool (2) being pressed under pressure through the filling pipe (15) or the filling tube into the cavity (13) of the silencer body (1) and/or being sucked in by a vacuum in the interior of the silencer body (1).
4. Method according to Claim 2 or 3, the filling openings (3) being formed before or after the silencer body (1) is assembled and being closed after the glass wool (2) is introduced.
5. Method according to Claim 4, an outer skin or outer shell (4) of the silencer body (1) being cut to form the filling opening (3), the cut-in section (6) being deformed and, after the glass wool (2) is introduced, being put back into shape again and, if appropriate, being welded (Fig. 3).
6. Method according to Claim 4, an end-side filling gap (7) between an inner pipe (5) and an outer skin or outer shell (4), which has a bulge on the end side, of the silencer body (1) being pressed shut again after the glass wool (2) is introduced and, if appropriate, being welded (Fig. 4).
7. Method according to one of Claims 1 to 6, an inner pipe (5) which is partially deformed on the circumference on the end side being put back into shape again after the glass wool (2) is introduced (Fig. 5).
8. Method according to one of Claims 1 to 7, with, after the glass wool (2) is introduced into the cavity (13) of the silencer body (1), a hole (8) or a circumferential perforation in an inner shell or an inner pipe (5) being closed again by pushing an intermediate pipe (9) into the inner shell or into the inner pipe (5) (Fig. 6).
9. Absorption silencer manufactured according to one of the methods according to Claims 1 to 8, characterized in that, for the subsequent introduction of the glass wool (2) into the premanufactured, assembled silencer body (1), an outer skin or outer shell (4) of the silencer body (1) has at least one filling opening (3) which is closed after the glass wool (2) is introduced.
10. Silencer according to Claim 9, the filling opening (3) of the silencer body (1), which is subsequently provided with glass wool (2), having a welded closure (10) in the form of a stopper which is welded on (Fig. 1).
11. Silencer according to Claim 9, the filling opening (3) of the silencer body (1), which is subsequently provided with glass wool (2), having a riveted closure (11) (Fig. 2).
12. Silencer according to one of Claims 9 to 11, the silencer body (1), which is provided with glass wool (2), having an outer shell (4) which is pressed on or an outer shell which is at least partially compressed and, if appropriate, is also welded (Fig. 4).
13. Silencer according to one of Claims 9 to 12, an inner shell or an inner pipe (5) of the silencer body (1) having a hole (8) or a circumferential perforation which, after the glass wool (2) is introduced, is closed by an intermediate pipe (9) which is pushed in (Fig. 6).

Images