DE2364464A1 - Joint for vehicle exhaust pipes - has sections telescoped together and secured by crimping over entire length - Google Patents

Abstract

Tubular parts of exhaust gas ducts are connected together. They are placed one inside the other and are pressed from outside in the superposition region over their whole periphery, and pressed together. Preferably the pressing corresponds in the radial direction to half the wall thickness of the pipe parts. One or more pressings-in, esp. as grooves, are mutually adjacent, and in addition depressions or extensions are made in the pressing-on over only part of the periphery. The joint prevents relative axial movement of the pipes, and gives a gas-tight joint.

Description

Daimler-Benz Aktiengesellschaft Palm 9996 / k

Stuttgart-Untertürkheim December 21, 1973

Method for connecting pipe parts of exhaust pipes

The invention relates to a method for connecting pipe parts of exhaust pipes.

The pipe parts were usually welded all around connected with each other. This welding requires a relatively high level of effort, since it is also subject to vibrations and large temperature fluctuations must ensure a safe and direct connection in order to prevent exhaust gases from escaping impede.

The invention is based on the object of specifying a method for connecting pipe parts of exhaust gas ducts at least the same durability causes lower costs.

The object is achieved according to the invention in that the pipe parts to be connected are inserted into one another and in which overlapping area are pressed in by pressure from the outside over a full circumference and thus pressed together.

The method according to the invention, in which the diameters of both pipe parts are reduced in the depressed area, is required just a relatively simple printing tool. So can

509827/0760

ORIGINAL INSPECTED

- 2 - Daim 9996/4

less well-equipped workshops also produce exhaust pipes; storage is simplified because only for different exhaust pipes usable pipe parts need to be stored. Another advantage is that the Pipe parts in the outer and inner diameters can have larger tolerances, as there are gaps between the nested Pipe parts disappear when pushed in.

A favorable depth of indentation is achieved when this corresponds to about half the wall thickness of the pipe parts. This ensures that the pipe parts are seated securely and tightly on one another guaranteed without the pipe parts being deformed unnecessarily will.

It is also advantageous if the width of the indentation corresponds approximately to the diameter of the pipe parts.

An anti-rotation device for the pipe parts is that in addition for the indentation, depressions or recesses in the indentation that run only over parts of the circumference are attached will.

An exhaust pipe produced by the method according to the invention with individual connected pipe parts is characterized in that the pipe parts by radial indentations about are connected to one another over a full extent in an overlapping area.

An exemplary embodiment of the invention is shown in the drawing. Show it.

Fig. 1 two nested pipe parts of an exhaust pipe and

Fig. 2 these pipe parts after pressing.

50 9 8 277 076 0

- 3 - Daim 9996 / k

The two nested pipe parts 1 and 2 of the exhaust pipe overlap over a considerable area. There is a distance between the outer surface 3 of the inner pipe part 1 and the inner surface k of the outer pipe part 2 which is less than half the wall thickness of the pipe parts 1 and 2. As can be seen in FIG an indentation 5 connected to one another. This indentation 5 has a depth which corresponds approximately to half the wall thickness of the pipe parts 1 and 2, so that the diameter of both pipe parts 1 and 2 are reduced in the area of the indentation 5 and thus a firm press fit is ensured. The space between the pipe parts 1 and 2 has disappeared. The indentation 5 is placed in the area of the overlap of the pipe parts 1 and 2 so that the ends of the pipe parts 1 and 2 protrude beyond the indentation 5 on different sides. At the right end of the pipe part 2, two recesses 6 are also provided, which run over only a small part of the circumference and prevent the pipe parts 1 and 2 from rotating relative to one another.

509827/0760

Claims (1)

Daim99 Q 6 / k Expectations A method for joining tubular parts of Äfogasieit wear _s characterized identified that are inserted into each other to be connected tubular parts (1,2) and reaching down into the overlapping Be = external pressure over a full circumference and compressed so that a =. Method according to claim I _0, characterized in "that the indentation (5) in the radial direction corresponds _{approximately to half the wall thickness of the pipe parts (1 β} ζ)" Method according to claim 1 or 2, characterized in that "" that the width of the indentation (5) corresponds approximately to the diameter of the pipe parts (i, 2) » Method according to Claim 1 or 2 _9, characterized in that several indentations, in particular in groove shapes, lie next to one another. Method according to claims 1 to 4, characterized in that that in addition to the indentation, depressions or disengagements only run over parts of the circumference be attached in the indentation = Exhaust pipe according to claims 1 to 5 with individually connected pipe parts, characterized ₉ that the pipe parts ("S ₉ 2) are connected to one another by a radial indentation (5) over a full circumference in an overlapping area. 509827/0760