DE3346924A1 - Silencer for motor vehicles - Google Patents

Abstract

A silencer (1) for motor vehicles has a closed casing (2), in the ends (3, 4) of which are arranged an inlet tube (5) and an outlet tube (6). A modular silencer insert comprising two partition walls (7, 8) and a multi-way pipe system formed by two symmetrical deep-drawn half-shells (9, 10) placed one on top of the other and connected to one another at the contact surfaces is pushed into the casing (2). The half-shells (9, 10) divide the interior of the casing (2) into an upper silencer space (17) and a lower silencer space (18). The individual pipes (11, 12, 13) of the pipe system formed by the two half-shells (9, 10) have inlet and outlet openings (11.2, 12.1) which open into the upper and lower silencer space (17, 18) respectively. Openings (14) in the contact surfaces of the two metal sheets (9, 10) making up the half-shells allow the exhaust condensate formed in the upper silencer space to collect in the lower silencer space, where it is expelled mechanically with the stream of exhaust gas. <IMAGE>

Description

PATENT LAWYERS '"

DIPL.-ING. W, GOLLWITZER DIPL.-ING. FW MOLL ° ° ⁺ ° ^ '"

6740 LANDATJ / PALATINATE LANGBTBABSB 5

POST BOX 2080 TELEPHONE 0 6341/20035, 8 7000 -TELEX 04 53 333 POSTSCHECK LTTDWIGSHAFEN 27 562-676 DEUTSCHE BANK LANDAU 0215400 (BLZ 5467OO95)

December 23, 1983

Paul Gillet GmbH, Edenkoben

"Silencers for motor vehicles"

The invention relates to a silencer for motor vehicles according to the reusable system according to the preamble of the patent claim 1.

Such a silencer is known, for example, ε us the DE-GM 80 27 103. This is a pure reflection silencer, in which the exhaust gas flow leading pipe is deflected twice by 180 °. This pipe system is formed by symmetrically formed half-shell pairs, which are placed on top of one another and at their contact surfaces are connected to each other. A special connection technology ensures that there are as few starting points as possible for corrosion. as well as a simple and inexpensive, but permanent connection of the various sheet metal parts.

Another silencer for motor vehicles with a gas duct deflected twice by 180 ° is known from US Pat DE-OS 32 09 211. The pipe system of the gas channel is formed here from a pair of half-shell sheets. Perforations

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in the pipe system enable the acoustic coupling of the spaces filled with absorption material between the half-shell sheets and the housing shell. Here, too, a special connection technology is described, the interlocking, provides elongated beads to partial short circuits between the individual pipes of the pipe system impede.

While the silencers described so far were essentially absorption silencers, in which may have been provided with additional reflection chambers, there is now a clear trend towards reflection silencers This applies in particular to the rear silencers. Reflection silencers require as often as possible cross-sectional jumps in the area of the gas duct, gas paths that are as long as possible and diversion of the gas flow as many times as possible.

The present invention is therefore based on the object of specifying a silencer of the type mentioned at the beginning, which meets these requirements without the overall structural effort compared to the previous designs must be enlarged.

This task is solved by the characterizing features of claim 1.

This has the advantage that only a single drawing tool is used to deep-draw the two shell half-sheets It is necessary that all spaces formed in the muffler housing between the partition walls from the full exhaust gas flow are flowed through one after the other, whereby the number of reflection chambers, the number of deflections of the gas flow and the length of the gas flows is increased without the structural effort having to be increased that all parts of the

Muffler are heated evenly, so that a high damping factor and at the same time a long service life low material and cost can be achieved.

According to an advantageous development, the half-shells are connected at the end to the partition walls and form se an independently manageable module. To improve the damping effect, several such modules can be used in one Silencer housings are used one behind the other.

A preferred embodiment of the invention is that the inlet opening in the with the outlet pipe in Connected pipe of the pipe system or in the outlet pipe itself at the spatially lowest point of the silencer housing is arranged. This is preferably the middle pipe of the pipe system. In this way, the due the multiple diversion and the large one with the Urigeburgsluft surfaces in contact, high levels of exhaust gas condensate to be expected, especially during cold starts and in urban operation be ejected from the muffler housing. In the previous designs, this condensate is: .- m essential expelled only in the vaporous state, whereby as a result of the concentration increase occurring during evaporation an increased effect of corrosion on the sheet metal parts of the muffler occurs.

To this mechanical expulsion of the exhaust condensate by To improve the suction effect of the exhaust gas flow, are advantageously in the contact surfaces of the two half-shells Through openings are provided through which the condensate that forms at the top reaches the lower damper chamber can from where it is driven out through the exit tube.

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An 'advantageous development consists in the inner surfaces of the silencer housing in the area of the deflection and damping module to be covered with absorption material. The large-area contact between the exhaust gas flow results in a good damping effect; furthermore, this absorption meteria} if necessary, too much cooling of the exhaust gases.

Further refinements of the invention emerge from the remaining subclaims in conjunction with the following Description of an embodiment based on the drawings. Show it

Fig. 1 is a plan view of the top of a muffler with the housing cut open,

Fig. 2 is a section along the line II-II in Fig. 1,

3 shows a section along the line III-III in Fig. 1,

Fig. 4 is a plan view of the underside of the

Muffler of Fig. 1, also with the housing and cut open

FIG. 5 shows a section along the line V-V in FIG. 4.

Fig. 1 shows the view from above into the interior of a silencer . One recognizes a housing 1, formed from a Shell 2 with an approximately elliptical cross-section and end faces 3, 4. The housing 1 is essentially closed;

Openings are only provided for an inlet pipe and an outlet pipe 6.

Inside the housing T you can see two partition walls 7, 8, which divide the interior of the muffler into three chambers or Divide rooms, namely in an entrance chamber 19, an exit chamber 20 and the damper rooms 17, 18.

Between the partition walls 7, 8 there is a tube system with a total of three tubes 11, 12, 13. This tube system is formed by two deep-drawn half-shell sheets 9, 10 which are placed on top of one another and connected to one another at their contact surfaces. On the end face, the half-shell sheets 9, 10 are connected to intermediate walls 7, 8, for example welded. One partition 7 has at least one opening 5 ¹ in the region of the pipe 11, through which the exhaust gas flows in, the other partition 8 has at least one opening 6 ¹ in the region of the pipe 13, through. ι which the exhaust gas flows out. The two half-shell plates 9,1) are connected by rivets or by stamped, bent BIE: h tabs 14 are connected together.

FIGS. 2 and 3 show sections through the illustrated in FIG. 1 Silencer according to lines II-II or III-III. You can see apart from the openings for the entrance or. Exit tubes 5, 6 further openings 15, 16, which in Are connected to one of the pipes 11, 12, 13 of the pipe system. Those additional, smaller openings represent partial short circuits with which the attenuation spectrum of the silencer can be adjusted.

Fig. 4 shows a plan view of the open underside of the muffler of Fig. 1. Since the two half-shell plates 9, 10 are symmetrically deep-drawn, the lower

The string looks essentially the same as the top string of the muffler, except for the gas openings.

Finally, FIG. 5 shows a section along the line V-V in FIG and are connected to one another at their contact surfaces. The side edges of the sheets 9, 10 touch the jacket 2 of the Silencer on the inside. This creates the interior of the damper into an upper damper chamber 17 and a lower one Dimpferraum 18 divided.

The flow of exhaust gases through the muffler is shown in the figures represented by arrows, the double arrows showing the main exhaust gas flow and the single arrows showing secondary flows symbolize the partial short circuits. The exhaust gas flow occurs enters the muffler through the inlet pipe 5 and first enters the first pipe 11. At the end of the first Tube 11 there are outlet openings 11.2, here in Form of perforations through which the exhaust gas can leave the pipe 11 and flow into the upper damper chamber 17. the end the upper damper chamber 17 it reaches an inlet opening 12.1 of the second tube 12. This inlet opening 12.1 is from the outlet opening 11.2 of the first tube as possible far away. The main exhaust gas flow then flows through the second pipe 12 and passes through the pipe located on its underside Outlet openings 12.2, which are again shown here as perforations, into the lower damper chamber 18 the end.

After flowing through the lower damper chamber 18, the exhaust gas flow occurs into an inlet opening 13.1 of the third tube, with outlet opening 12.2 and inlet opening 13.1

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469 ^ 4

are as far apart as possible, flows through the third pipe 13, enters the outlet pipe 6 and leaves this after all.

On its way between inlet pipe 5 and outlet pipe 6 the exhaust gas has undergone four deflections and a large number of cross-sectional changes and the length of the half-shell sheets 9, 10 between the two intermediate walls 7, 8 run through five times, but the structural complexity of the Silencer compared to a conventional three-way system does not is increased.

In the previous explanation, the entrance and exit chambers were 19, 20 neither through which the exhaust gas flows nor coupled to the spaces through which the exhaust gas flows. This additional Coupling takes place in the present example through e: .ne outlet opening 5.2 in the inlet pipe, through which a partial flow of the exhaust gas flows into the input chamber 19. D arch the opening 15 in the partition 7, this exhaust gas bypasses into the third pipe 13. A further secondary exhaust gas path arises as a result of the opening 16 in the partition 8 in the area of the central tube 12 in connection with inlet openings 6.1 in the outlet pipe.

Another option, not shown here, of entering E-ingang3- and output chambers 19, 20 also to be included in the exhaust gas flow consists in the input pipe 5 and the output pipe 6 not to connect directly to the pipe system formed from the two half-shell plates 9, 10, but to connect them to end in the area of the inlet or outlet chamber 19, 20, as shown for the outlet pipe 6.

The exhaust gas routing shown does not only result a significantly improved damping behavior due to the

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long gas paths, multiple gas diversions and cross-sectional jumps, but at the same time an even heating of all sheet metal parts, which extends the service life of the system benefits.

As a result of the large, connected with the outside world.! and jacket surfaces 2 exposed to the exhaust gas flow are there; The exhaust gas is cooled to a relatively great extent, so that an increased accumulation of condensate is to be expected. This exhaust gas condensate passes through openings 14, for example hollow rivets, which hold the 3 half-shell sheets 9, 10 together, from the upper damper space 17 into the lower damper space 18. In the lower damper space 18, however, there is also the inlet outlet 13.1 of the last, Ro ires 13 connected to the outlet pipe 6. In addition, the outlet pipe 6 can be S-shaped so that its inlet openings, ie the perforations 6.1, lie at the lowest point of the outlet chamber. The exhaust gas condensate collecting in the lower damper chamber 18 is driven out with the exhaust gas flow without having to evaporate beforehand. This eliminates the often observed increase in the concentration of corrosive substances when the water content in the exhaust gas condensate evaporates.

Additional partial spaces can be created through further longitudinal or transverse walls in the area of the upper and lower damper space 17, 18 be created, with which the damping behavior of the muffler can be changed further. This measure is particularly appropriate when, for example, by appropriate shaping of the two half-shell sheets five or seven tubes can be formed.

Since the two half-shell sheets 9, 10 and the two partition walls 7,8 are connected to each other, they form an independently manageable damping module. In one housing If necessary, several of these modules can be arranged one behind the other.

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Claims (10)

DIPL.-ING. W. GOLLWITZBR DIPL.-ING. P. W. MOLL 6740 LANDAU / PALATINATE LANG8TEA8SE 5 POST BOX 2080 TELEPHONE 06341/20035, 87000 TELEX 04 53 333 POSTSCHECK LaDWIGSHAFEN'27 562-676 DEUTSCHE BANK LANDAU 02 15 400 (BLZ 54670095) December 23, 1983 Paul Gillet GmbH, Edenkoben "Silencers for motor vehicles" Claims 1/. Silencer for motor vehicles according to the multi-way system, with a closed housing, with an inlet pipe and an outlet pipe, as well as with a pipe system formed from two symmetrically shaped half-shells placed on top of one another and connected to one another at their contact surfaces, the half-shells being held by two partition walls, characterized that the half-shells (9,10) share the interior of the housing (1) between the partition walls (7,8) in an upper damper chamber (17) and a lower damper chamber (18), that the partition walls (7,8) with the Endekanten.der half-shells (9,10) are connected so that the partition walls (7,8) each have an opening (5 ', 6 ¹ ) for the entry and exit of the exhaust gas flow and are in contact with the housing jacket (2) and that the exit openings (11.2, 12.2) and the inlet openings (12.1, 13.1) of the pipes (11, 12, 13) of the pipe system between the partition walls (7, 8). lie and alternately open into the upper and lower damper chamber (17,18). BATH ORIGINAL 3246S24 2. Silencer according to claim 1, characterized in that the half-shells (9,10) are connected at the end with the partition walls [I ₁ 8) and form a self-handling module. 3. Silencer according to claim 1 or 2, dadurc h characterized in that the inlet opening (13.1) in the with- " the output pipe (6) connected pipe (13) of the Pipe system is arranged at the spatial lowest point of the muffler (1). 4. Silencer according to claim 3, characterized in that it is marked, that through holes (14) are provided in the contact surfaces of the two half-shells (9, 10). 5. Silencer according to claim 3 or 4, characterized characterized in that the central pipe (12) of the pipe system; opens into the outlet pipe (6). 6. Silencer according to at least one of the claims 1 to 5, characterized in that the inlet and outlet openings (11.2, 12.1, 12.2, 13.1) as Perf orati:> nen are trained. 7. Silencer according to at least one of the claims 1 to 6, characterized in that in the partition walls (7, 8), the pipes (11, 12, 13) of the pipe system, the inlet pipe (5) and / or the outlet pipe (6) additional openings (5.2, 6.1, 15, 16) for the formation of exhaust gas flow bypasses or partial short circuits provided sini. 8. Silencer according to at least one of the claims 1 to 7, characterized in that the upper or lower damper space (17, 18) is formed by further partition walls, Parts of partition walls and / or longitudinal webs in terms of flow is divided. BATH ORIGINAL 9. Silencer according to at least one of the claims 1 to 8, characterized in that in the upper b :: w. lower damper chamber (17,18) acoustically coupled Resonator chambers are provided. 10. Silencer according to at least one of the claims 1 to 9, characterized in that the inside of the housing (1) is covered with absorption material.