DE7223051U - Nonwoven web made of heat-resistant and corrosion-resistant material as a sound-absorbing filling for silencers in internal combustion engines - Google Patents

Description

Applicant; 67 LUdwigshafen / Eh., January 26th, 1973

German metal fiber factory GM 1793 II / wüs. '*

Bullmer and Dr. Schwabbauer *

6921 Bargen / Nordbaden GM-Note: G 72 23 051 * 4

and

First German basalt wool KG
A. Messier
8712 Volkach / Main
Ringstrasse 1

Representative:

Patent attorneys

Dipl.-Ing. Adolf H. Fischer
Dipl.-Ing. Wolf-Dieter Fischer
67 Ludwigshafen am Rhein
Richard-Wagner-Strasse 22

VIies fabric sheet made of heat and corrosion resistant Material used as a sound-absorbing filling for silencers in internal combustion engines

The invention relates to a nonwoven web made of heat-resistant and corrosion-resistant material as a sound-absorbing material Filling for silencers in internal combustion engines.

As a sound-absorbing panels whether in the form of mats or moldings are used in silencers in many cases Minereifasern that the essential

made of basalt rock wool. Such mineral fibers have a high melting point and are made from this Basically well suited for such silencers. On the other hand, however, such mineral fibers are also mechanically stressed in internal combustion engines break up the individual fibers so that the silencer becomes unusable in a relatively short time.

The invention has the task of creating a nonwoven web for mufflers in which such Mineral fibers can be used, but at the same time it should be ensured that a destruction of this Fibers is prevented.

The solution to this problem has now been found in that a Layer of mineral fiber is connected to a layer of metal fiber. If you have such fillings in silencers built in, then this will be done in such a way that the metal fiber layer covers the perforated pipes carrying the exhaust gases in the muffler. In this way you can get the high sound absorption value and the temperature resistance exploit the mineral fiber, because they through the connection with the metal fiber is exposed to almost no mechanical stresses.

According to the invention, these can be connected to one another Layers are present in the form of nonwovens which can be connected to one another in the most varied of ways; possibly. the free side of the mineral fiber layer can be connected to a carrier web of any material. as

The carrier web can be plastic foils, paper, textiles and similar materials. ·

In many cases, it is also advantageous for the fibers of the metal fiber layer to be those made of heat-resistant and corrosion-resistant Use steel.

It doesn't matter whether the two layers of mineral fiber and metal fiber are needled or quilted together or they are connected to one another with the help of thread or wire or put together by means of some kind of glue always achieved the advantage that the hard pulsation of the exhaust gas flows is caught by the metal fiber and the lying mineral wool is protected so that the fibers the mineral wool does not break. In many cases, one can proceed in such a way that one gets out of the connection of the Layers of mineral fiber and metal fiber body which then build into the internal structure of a muffler are manufactured can be used or fitted.

Further features of the invention emerge from the following Description of an embodiment in connection with the drawing and the claims.

It show, in schematic sketches,

FIG. 1 shows a section through part of a combined fiber fleece,

Figure 2 shows a section through part of a combined fiber fleece with a

Carrier layer and

FIG. 3 shows a body formed from fiber fleeces for use in a silencer.

In Figure 1 is a for the filling of a muffler provided piece from an inventively designed Sound-absorbing mat shown, which consists of a layer 1 of Mineral fibers and consists of a layer 2 of metal fibers. The two layers 1 and 2 can, for example, by needling be connected to each other.

A sound-absorbing mat with also a carrier web 3 is used is shown in a partial section in FIG. 2. Here, too, the two nonwovens can be needled to one another be, but can also be connected to the carrier web by quilting and the use of adhesives at the same time of the most varied kinds appear possible.

Bodies 4 can also be produced from these sound-absorbing mats are, as Figure 3 shows, where such a body is shown in the form of a half hollow cylinder, in which in the Inside a layer 2 made of metal fiber and outside a layer 1 made of mineral fiber was arranged * A solehei · Body can be eaten and so designed that it can be eaten with the cavity of the metal fiber layer 2 is applied to the perforated, the exhaust gases leading muffler pipe, so that the used protection of the mineral fiber layer 1 is thereby given. The connection of the layers a. you can with such Bodies can also be produced in a wide variety of ways, but it will be advantageous to design such a body as a compact.

Claims (5)

Protection claims 1) Nonwoven web made of heat and corrosion resistant Material as a sound-absorbing filling for silencers in internal combustion engines, characterized in that that a layer (1) of a mineral fiber is connected to a layer (2) of a metal fiber is. 2) nonwoven web according to claim 1, characterized in that that the layers (1, 2) are in the form of nonwovens which are connected to one another. 3) nonwoven web according to claim 2, characterized in that the free side of the mineral fiber layer (i) with a carrier web (5) of any material is connected. 4) nonwoven web according to claim 1 to 3> characterized in that the layers (1, 2) and, if necessary, the carrier web (3) are made by needling, stitching, and awarding or the like. Are connected to each other. 5) nonwoven web according to claim 1 to 4, characterized in that that steel fibers, which are heat and corrosion resistant, are used for the metal fiber layer (2).