DE19962379A1 - Process for the manufacture of an absorption silencer - Google Patents

Abstract

In a method for producing an absorption muffler for motor vehicles in half-shell construction with a sound-absorbing material in the form of glass wool (10) or the like arranged in a cavity of the half-shells (1, 2), the muffler body being completely prefabricated and assembled and the glass wool ( 10) in the prefabricated, assembled half-shells (1, 2) is subsequently introduced from the outside through one or more trained filling openings (3) into the cavity, and the filling openings (3) are closed again after filling, it is proposed in the shallow ones Shell edge (4 or 5) of each half-shell (1 or 2) to prefabricate at least one indentation (6 or 7), which form at least one filling opening (3) in the case of composite half-shells (1, 2), the shell edges (1) 4, 5) of the assembled half-shells welded and the filling openings closed after filling t and also welded. The welding of the shell edges (4, 5) in particular is carried out by laser.

Description

The invention relates to a method for producing a Absorption silencer for motor vehicles in half-shell Construction with one in a cavity of the half-shells arranged soundproofing material in the form of glass wool or the like, with the silencer body completely prefabricated and put the glass wool in the prefabricated made, assembled half-shells subsequently from the outside through one or more trained filling openings in the Cavity is introduced, and the filling openings after ei be closed again when filling.

As is known, absorption silencers have annular gaps and / or chambers in which the sound absorbing material, in particular glass wool, is arranged. The soundproofing material is around the semi-finished product of an inner shell or around a Inner tube attached before the outer shell is assembled and with the inner shell or the inner tube, e.g. B. over a Fold or a weld, is connected. The order of the incompatible flexible sound absorption material to the places provided for this purpose or in the places provided for this purpose chambers of a silencer and the subsequent closing assembling the silencer body is comparatively difficult full and expensive.

In a known from DE-A-198 11 192, mentioned above  Simplified manufacturing process is the silencer body completely prefabricated and the soundproofing material subsequently introduced through filling openings. The sound damper body can be in a wrap construction or in half-shell construction be provided wisely. With a silencer body in half shell construction with a folded fold between the The filling openings in the jacket are half shells ner half shell or on the front of the silencer body pers.

The object of the invention is a simplified method for Production of an absorption muffler in half scha len construction using simple means to put and accordingly a silencer on simple Way to create.

The task is solved by a manufacturing process of Art specified in claim 1.

This method is advantageously further developed by Features of claims 2 to 4.

An absorber manufactured by the method according to the invention tion silencer is characterized by the characteristics of the Claim 5.

The sole silencer is advantageously further developed by Features of claims 6 and 7.

Essence of the method for producing a Absorption muffler is that in the flat shells At least one indentation is made in front of each half-shell is done, at least with assembled half shells form a filling opening, the flat one on top of the other lying shell edges of the assembled half shells  welded and the filler openings after filling pressed and also welded.

The edges of the shell are welded in particular by laser.

The glass wool is expediently under pressure or suction through the filling opening (s), preferably through Blow in or by suction.

The manufacturing method according to the invention is also suitable for unpacked glass wool that passes through the filling opening (s) is introduced.

An absorption manufactured by the aforementioned method Muffler in half-shell construction includes prefabricated Half shells with flat shell edges, which indentations have, at least in composite half shells form a filling opening, which after filling can be pressed flat.

Put the shell edges lying flat on top of each other ter half-shells are in particular by means of laser seam la server welded, the flat after filling pressed filling opening preferably by means of further lasers is also laser welded.

Unpacked glass wool can also be processed in the silencer body processed or introduced.

The invention makes the production of an absorption silencer in half-shell construction simplified in that as - in contrast to the known procedure mentioned at the beginning ren - now the filling openings in the separating or connecting area of the two half-shells previously attached, esp  special, can be impressed, and half of a Entry opening through an indentation or gutter that together set with a preferably uniform counter-on Bay or counter gutter a circumferentially closed Form the complete filling opening, which preferably can have a round cross-section. Every indentation is in the otherwise flat, not folded edge one each the half-shell integrated and easily again without material breakable again if after filling the glass do not want the filler opening in the interior of the silencer more is needed. Known in the margin or fold area Sorption half-shell mufflers have so far been possible no filling openings are formed because of the single or multiple folds folded the formation of Filling openings per se are not permitted. The invention solves this problem due to the flat edge formation of the half-shells, which are then preferably laser-welded.

So there are the half-shells with the one in the invention Joined inner parts laser-welded. After that, a Embossed openings in the edge of the shell blow in the glass wool. Then the openings are pressed and welded. The Openings are co-embossed when the shell is made. It Unwrapped glass wool can be processed. Disorders due to fiber residues in the welding area do not occur.

The invention is illustrated below with the aid of an embodiment game with reference to the accompanying drawings described; show it:

Fig. 1 is an absorption silencer of semi-monocoque construction, in a perspective schematic view to a prefabricated open Einfüllöff voltage,

Fig. 2 shows the absorption muffler according to Fig. 1 in the loading area Be in an enlarged per perspective view, and

Fig. 3 shows the formation of the part of the absorption muffler fers according to Fig. 2 after pressing and welding the filler opening.

Referring to FIGS. 1 to 3, an absorption Schalldämp fer comprises a muffler body in half-shell construction.

In particular, the muffler has an upper half-shell 1 and a lower half-shell 2 . Inside there are further silencer parts that are of no further interest here.

Both the upper half-shell 1 and the lower half-shell 2 have flat shell edges 4 and 5 , which in the assembled state of the two half-shells lie generously on one another and are welded, for example by means of a laser seam 11 . In each shell edge 4 and 5 at least one Einbuch device 6 and 7 are impressed.

The indentations 5 , 6 embossed into the flat shell edges 3 , 4 of the prefabricated half shells 1 , 2 form at least one filler opening 3 when the half shells 1 , 2 are assembled, which can be pressed flat and also welded after filling, for example by means of a further laser seam 12 .

The inventive method for producing the vorgenann th absorption silencer for motor vehicles in half-shell construction with a in a cavity of the half-shells 1 , 2 arranged soundproofing material in the form of glass wool 10 or the like, the silencer body being completely prefabricated and assembled and the glass wool 10 in the prefabricated, assembled half-shells 1 , 2 is subsequently introduced into the cavity from the outside through one or more filler openings 3 , and the filler openings 3 are closed again after filling, thus characterized by the fact that 4 or 5 of each half-shell 1 or 2, at least one indentation 6 or 7 is prefabricated, which form at least one filling opening 3 when the half-shells 1 , 2 are assembled, the edges 4 , 5 of the assembled half-shells being welded flat and the filling opening (e n) pressed after filling and also welded.

The welding of the shell edges 4 , 5 in particular is preferably carried out by laser.

The glass wool 10 is introduced under pressure or suction through the filling opening (s), preferably blown in or sucked in.

Unpacked glass wool 10 can also be introduced through the filling openings 3 .

Claims (7)

1. A method for producing an absorption muffler fers for motor vehicles in half-shell construction with egg nem in a cavity of the half-shells ( 1 , 2 ) arranged soundproofing material in the form of glass wool ( 10 ) or the like, the silencer body being completely prefabricated and assembled and the glass wool ( 10 ) in the prefabricated, assembled half-shells ( 1 , 2 ) is subsequently introduced from the outside through one or more filling openings ( 3 ) formed into the cavity, and the filling openings ( 3 ) are closed again after filling, characterized that in the flat edge of the shell ( 4 or 5 ) each half-shell le ( 1 or 2 ) at least one indentation ( 6 or 7 ) is made before, which form at least one filler opening ( 3 ) when the half-shells ( 1 , 2 ) are assembled , where the flat half-shell edges ( 4 , 5 ) of the assembled half-shells are welded and the filler openings are pressed after filling and are also welded if necessary. 2. The method according to claim 1, characterized in that the welding in particular of the shell edges ( 4 , 5 ) is carried out by laser. 3. The method according to claim 1 or 2, characterized in that the glass wool ( 10 ) introduced under pressure or suction through the filling opening (s), preferably blown or sucked. 4. The method according to any one of claims 1 to 3, characterized in that unpacked glass wool ( 10 ) through the filler opening (s) is introduced. 5. absorption muffler in half-shell construction, manufactured according to one of the methods according to claim 1 to 4, characterized in that the flat shell edges ( 4 , 5 ) of the prefabricated half-shells ( 1 , 2 ) have indentations ( 6 , 7 ), in the case of composite half-shells ( 1 , 2 ) form at least one filling opening ( 3 ) which can be pressed flat after a filling. 6. absorption muffler according to claim 5, characterized in that the flat superimposed shell edges ( 4 , 5 ) composite half-shells ( 1 , 2 ) are laser-welded by means of laser seam ( 11 ), the filling opening being pressed flat after filling preferably also is laser-welded by means of a further laser seam ( 12 ). 7. absorption muffler according to claim 5 or 6, characterized in that in the muffler body unwrapped glass wool ( 10 ) is processed or introduced.