DE3038181A1 - ARRANGEMENT FOR CONNECTING EXHAUST PIPES - Google Patents

Description

Arrangement for connecting exhaust pipes

The present invention relates to an arrangement for connecting of exhaust pipes, in particular with an exhaust manifold by means of a flange which has a frustoconical hollow Has opening into which engages the frustoconical end of the exhaust pipe which is adapted in shape. Such a one Arrangement is particularly suitable for connecting double pipes that are to be attached to the exhaust manifold.

Usually the exhaust pipes are attached directly to the flange welded on, after which this is screwed to the exhaust manifold by means of bolts.

However, such a rigid arrangement still has the disadvantage that it prevents mechanical vibrations originating from the engine; forwards; Depending on the dimensions and the mass, natural frequencies can occur that are detrimental to the service life this arrangement are.

An attempt has therefore already been made to establish the connection using Reinforcing the flange and exhaust pipes, which does not always lead to the desired success and is also expensive. That The application of reinforcement weld seams requires heating of the pipes, which are easily broken, so that their mechanical properties are deteriorated.

The object of the present invention is to avoid these disadvantages and to provide an arrangement for connecting exhaust pipes propose that is easy to install, cheap and durable.

^ 0018/0717

Based on an arrangement of those mentioned in more detail at the beginning Art, the solution to this problem is carried out with the in the characteristic Part of claim 1 specified features. An advantageous further development is in the claim. 2 described.

In the following the invention is explained in more detail with reference to the drawing, show:

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Figures 1 and 2 show two conventional examples of welded and reinforced joint assemblies;

Figure 3 is a perspective view of the invention Arrangement;

FIG. 4 shows a section through the arrangement;

FIG. 5 shows a section through the arrangement at the time of assembly and FIG

FIG. 6 shows an advantageous exemplary embodiment for connecting several pipes to one another.

As can be seen in FIGS. 1 and 2, in the conventional Assembly the pipes 1 and 2 connected to a flange 3 by means of weld seams. As already stated above, this connection arrangement is applied by means of additional Welds 5 or wedge-shaped reinforcing ribs 6 reinforced both on the pipes and on the flange 3 are applied. During this welding process, the metal adjacent to the weld seams is heated, cooled down again and thus easily brittle.

In the invention is shown in Figures 3 and 4, the disadvantages arising from welding are avoided. Also the occurrence of play due to expansion phenomena of the individual parts when the engine reaches the operating temperature

130018/0717

is avoided as it is both cold and warm maintain excellent mechanical strength and exact gas tightness between the pipe and the flange will.

This is achieved in that the exhaust pipe end adjacent to the flange 3 has a frustoconical shape 7, while in the flange 3 a correspondingly adapted opening 9 also is provided with a frustoconical shape 10, in which the exhaust pipe end engages.

The upper edge of the frustoconical exhaust pipe end 7 has a bead 8, which clings firmly to the flange while the pipe is pressed into the flange with force will.

With 11 in Figure 3 are individual along the circumference of the Opening in the flange 3 denotes intended folds, which, when the pipe is pressed in, form a crimped connection through deformation and thus better hold the pipe serve in the flange. Excellent results in both cold and warm conditions have been achieved with one Flange 3, the height of which was approximately 12 mm and the The angle of inclination of the truncated cone was between 20 and 26 ° and along the edge of the opening of the truncated cone 10 three deformable pinch points were provided in the flange. The flange is also provided with an opening 12, e.g. to enable it to be screwed onto the exhaust manifold.

The arrangement according to the invention has excellent gas tightness and at the same time creates a sufficient one Elasticity between the pipes and the flange, as these have not been heated by the use of welding equipment. Through this a large part of the mechanical vibrations emanating from the engine is absorbed.

130018/0717

Another advantage is that the manufacturing costs reduced werdery with the arrangement according to the invention can still be used to connect individual pipes to a flange or to connect exhaust pipes to one another can, as shown in FIG.

In jensm embodiment, each tube 20, 21 is with a flange 22, 23 connected, as described above, by the frustoconical pipe ends 27, 28 in corresponding Openings 29, 30 of the flanges engage, producing crimped connections 25, 26. Then the Flanges placed one on top of the other with their free surfaces and connected by means of bolts 24.

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Claims (2)

Uwe M. Haft Patent attorney Maximilianstrasse 15 D-8000 Munich 22 Tel .: (089) 294818 Telex: 523514 Telegr .: NOVAPAT H 575 ch Regie Nationale des üsines Renault, 92109 Boulogne Billancourt, France Patent claims 1.) Arrangement for connecting exhaust pipes, in particular with an exhaust manifold, by means of a flange which has a frustoconical hollow opening into which the in frustoconical end of the exhaust pipe adapted to the shape engages, characterized in that along the outer diameter A bead is provided at the end of the exhaust pipe, which is deformable when the pipe is pressed into the flange is and that individual deformable pinch points for reinforcement the connection between the pipe and the flange are provided along the circumference of the opening in the flange. 2. Arrangement according to claim 1, characterized in that two flanges, on each of which an exhaust pipe is attached with their free surfaces lie on top of one another and screwed together are. * S Λ Λ Ί Λ ί Λ 1