DE7220717U - Elastic exhaust pipe, in particular for motor vehicles with internal combustion engines - Google Patents

Description

Karlsruhe, May 29, 1972

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INDUSTRIE-WERKE KARLSRUHE AUGSBURG Aktiengesellschaft

75 Karlsruhe
Gartenstrasse 71

Elastic exhaust pipe, in particular for motor vehicles with internal combustion engines

The invention relates to a device for absorbing axial, lateral and / or angular movements and for absorbing vibrations, thermal and / or chemical-corrosive loads, in particular for exhaust pipes of motor vehicles with internal combustion engines, using one at both ends through each a connecting flange or pipe bend or the like. Limited and firmly clamped metal bellows, which is used to discharge the exhaust gases serving metallic guide tube encloses centrically

Exhaust pipes of motor vehicles with internal combustion engines are usually high mechanical, thermal and chemically cor-

subjected to rosive loads. Shorten such loads the service life of these exhaust pipes is considerable

To counter such or similar evils, is already one Exhaust pipe became known, in which a two-piece metal The bellows centrally surrounds a metallic guide tube used for exhaust gas removal. To adapt the in.his Leitröhreβ formed differently in diameter the metal bellows halves of the same diameter as one another, it turned out to be absolutely necessary to have an intermediate ring to be attached to the guide tube, to which in turn the mutually facing ends of the metal bellows halves are attached

For reasons of durability, the intermediate ring is in the known solution welded onto the guide scope. In the same way, the mutually facing ends of the two metal bellows halves are inseparable connected to the ring.

It is obvious that the welding of the intermediate ring both with the guide tube and with the facing ends of the two metal bellows halves extremely material, and is wage-intensive. The same criteria naturally also apply to those to be produced by machining Intermediate ring. The product is therefore relatively expensive

722071725.10.73 - 3 -

At the point you can always see the essence of the invention, which is itself set the task of decisively improving the known exhaust pipe and thus making it significantly cheaper in the end.

According to the invention, this object is essentially achieved in that the one-piece and at the same time multi-corrugated bellows contains a non-corrugated cylindrical intermediate piece approximately in the middle of its axial extension, the inner surface of which is connected to a corresponding outer surface of the in Axial · S3rStrwwkiz »e {svsi-} ^ stsiltsn Lsitrehr« inseparably connected ± st _s

In an extremely advantageous and cost-effective embodiment of this Invention thought, the proposed invention provides that the permanent connection of the non-corrugated cylindrical bellows intermediate piece takes place with the guide tube by means of known spot welding.

According to another feature of the invention, it is provided that the Guide tube on its side facing away from the junction with the non-corrugated cylindrical intermediate piece so wide in diameter is reduced that it is especially when taking up angles or the like. Movements by the bellows from the inside of the pipe elbow not touched.

722071725.1173 - * -

Advantageous embodiment learns oils proposed invention also by a further Mörkmal, which is characterized by let the connecting flange delimiting the essentially cylindrical guide tube half in the direction of the connecting flange there Metal bellows with a rotationally symmetrical conical Recess is provided which extends partially in the axial direction of the flange.

Finally, the proposed invention is rounded off and perfected in that the metal bellows is multi-walled, preferably double-walled, can be formed.

It is obvious and convincing at the same time that with the proposed Invention are accompanied by a number of distinctive advantages, but without exhausting themselves in these alone?

The use of a one-piece bellows is the same as in the known one Solution required intermediate ring dispensable This eliminates the need for material and costly materials that are unnecessarily expensive for the product Labor costs. With the omission of the intermediate ring, a number of expensive circular weld seams can also be dispensed with. From this in turn there is a considerable reduction in dangers, the causes of which are practically unavoidable in the case of weld seams in particular Corrosion, leakage or the like.

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Another advantage of the proposed invention is that, as a result of the saved round weld seams The "passive" overall length of the bellows obtained is available as an "active" length for wave formation and thus for greater expansion absorption stands"

A not inconsiderable advantage results from the proposed one Invention also through the mass reduction as a result of saving the intermediate ring and the circumferential weld seams, because as a result the critical resonance frequency of the bellows is significantly increased will. Compared to bellows with an intermediate ring, in the case of the invention Solution with equal expansion absorption due to the larger number of corrugations in the bellows, the individual wall thickness is only smaller Increasing the inherent resistance can be increased. In this way, too, the security against undesired corrosion influences can be reduced increase significantly.

In the drawing, the invention is shown using an exemplary embodiment. The drawing shows a vertical section through the bellows construction.

That of a - not shown - internal combustion engine exhaust gas entering at A passes through the metallic, essentially

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cylindrically designed guide tube part 2 and then passes through the metallic, partly conical guide tube part 3 through the pipe bend 1 at B into a - not shown - exhaust pipe and from there out into the open air.

For absorbing axial, lateral and / or angular movements as well as for absorbing thermal and / or chemically corrosive A one-piece and at the same time multi-corrugated metal bellows 5 is provided for loads. Approximately in the middle of its axial extension the bellows 5 contains a non-corrugated cylindrical intermediate piece 6. The inner surface of this intermediate piece 6 corresponds to the correspondingly designed outer surface of the guide tube part 3t which is separated from the guide tube part 2 by the joint 7.

The connection of the inner surface of the Ealg intermediate piece 6 with the The outer surface of the pipe oil is made by means of spot welding; the welding points 8 are spaced equally over the circumference distributed.

The metal bellows 5 let with its free ends connected on one side to the pipe elbow 1 and on the other side to the connecting flange k . The connection of these parts is done using a ring 9 by welding.

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With an angular od. The like. Movement of the bellows 5 relative to the Pipe elbow 1 can, as a result of the significant reduction in its diameter, guide pipe part 3 undisturbed from the inside of the pipe. Bend 1 in the angular od. Like. Movement of the bellows 5 participate. The guide tube part 2 behaves in the same way with a or the like. Movement of the bellows 5

For reasons of strength or the like, the bellows 5 can be multi-walled, preferably double-walled.

Claims (4)

., 3 claims for protection 1. Elastic exhaust pipe, especially for motor vehicles with internal combustion engines, for recording of axial, lateral and / or winker movements as well as for absorbing vibrations, thermal and / or chemical-corrosive loads, using one at both ends through a connection flange each or pipe bends or the like «limited and firmly clamped metal bellows, which a derive the exhaust gas serving metallic guide tube encloses centrically ,. characterized, that the one-piece and at the same time multi-corrugated Metal bellows (5) contains a non-corrugated cylindrical intermediate piece (6) approximately in the middle of its axial extension, its inner surface with a corresponding outer surface of the axially divided (two) Guide tube (2, 3) is inextricably linked. 2. Elastic exhaust pipe according to claim 1, characterized in that that the indissoluble connection of the non-corrugated cylindrical 7? 2071725.W.73 4th in the t · f · Bellows intermediate piece (6) with the guide tube (3) takes place by means of "known spot welding (8)". 3. Elastic exhaust pipe according to claim 1 and 2, characterized in that that the guide tube (3) at its junction with the non-corrugated cylindrical intermediate piece (5) facing away Siete is reduced so far in diameter that it is especially when recording angle od. Like. Movements through the bellows (5) from the inside of the pipe elbow (1) is not affected. 4 »elastic exhaust pipe according to claim 1 to 3, characterized, that the metal bellows (5) can be multi-walled, preferably double-walled. 722Θ71725.10.73