DE8131743U1 - Connection of tubular plastic and metal parts - Google Patents

Description

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description

The invention relates to a connection of tubular plastic and Metal parts in which a metal mouth part is liquid-tight and temperature-resistant on a plastic pipe socket is attached, as is the case with filler necks of plastic fuel tanks, at the connection points of plastic hoses occurs with the expansion tank in automotive cooling systems and in many similar cases.

From packaging technology, connections are already more non-metallic Container with metallic lids known, which by flanging a lid edge around a paragraph on Opening edge of the container are made. These are mainly glass containers * those with a thin sheet metal lid are to be closed, the flanged edge of which can be deformed without difficulty by flanging hooks or flanging rollers and beaded.

This method of operation cannot be used for processing thick-walled metal sheets. There is also another difficulty which occurs with technical parts compared to packaging containers and which lies in the bulkiness of the parts to be processed. Here it is not at all possible to use one of the known crimping devices, apart from the fact that this is done when in use thicker and therefore stiffer materials, as already mentioned, would not lead to success either.

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So far, for example, the filler neck for truck fuel tanks, together with the entire container, made of plastic and dispensed with a metal reinforcement. Such container mouths however, they are only conditionally resistant to impact, shock and bending forces, such as those encountered in rough operation and also occur when handling the filler pipes of fuel guns.

In addition, for plastic container mouths almost always new lids are constructed because the previous ones Do not allow the metal lid to be used any longer.

Similar disadvantages arise when converting cooling systems, which were previously made of metal, to plastic watch. Here, high-temperature-resistant connections between plastic hoses and plastic expansion tanks must be used created, which can only be solved properly and safely with metal connections.

This resulted in the object on which the invention is based, namely the creation of a liquid-tight, temperature-resistant Connection of tubular plastic and metal parts existed, which the risk of su poor resistance against mechanical stress and thermal stress.

This object was achieved according to the invention for tubular connections of the type mentioned at the outset in that for the form-

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stable connection of the plastic and the metal part on the underside of the metal mouth part a beaded edge is arranged, which protrudes over a shoulder of the plastic pipe socket and

into a multitude of individual, separate bending surfaces is divided,

which can be bent to produce the connection up to their flat contact on the shoulder and that at the transition point from the plastic pipe socket into the metal mouth part, an elastic sealing ring is used is.

To accommodate the sealing ring, a recess is provided on the mouth edge of the plastic pipe socket and To generate the sealing force, an inward-facing, all-round indentation is arranged in the metal mouth part, which occurs when the bending surfaces are bent over onto the sealing ring and onto the mouth rim of the plastic pipe socket touches down.

The particular advantages of the connection according to the invention are above all that plastic pipe terminations with it easily reinforced and made resistant to stresses to which a plastic pipe muzzle otherwise it would not have grown in the long run. After the attachment of a metal muzzle part is required there is no more increased attention in the handling of the filling devices than is the case with conventional all-metal containers is required.

In many cases it is also advantageous that the previously used metal sealing caps continue to be used unchanged.

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can be used, which is otherwise not possible with plastic pipe terminations.

An exemplary embodiment is explained in more detail below with reference to the drawing.

In the picture is the filler neck of a plastic fuel tank, partially cut, shown.

f, The complete filler neck 1 consists of the plastic -

Pipe socket 2, the metal mouth part 3 and the sealing

y ring 4.

The plastic pipe socket 2, together with the entire tank container (not shown), was blown

,; made of plastic in pieces.

The metal mouth part 3 is on the plastic tube

nozzle 2 attached after the sealing ring 4 has been

, - \ Countersink 5 on the mouth edge 6 of the plastic pipe socket 2

was inserted (right half of the drawing).

! ι Located on the underside 30 of the metal mouth part 3

the bead 7, which is in a plurality of individual, from each other separate bending surfaces 70 is divided. The bending surfaces 70 stand after the metal muzzle part 3 has been placed on on the plastic pipe socket 2 down over and then, to connect these parts, around the outer edge of the paragraph 8 of the plastic pipe socket 2 bent around until they come to rest on the lower surface of the paragraph 8. Of the Vi bending process is done with the help of known bending tools, the

a generate a predetermined surface pressure, which guarantees

f for a dimensionally stable, non-positive connection of the plastic

Pipe socket 2 with the metal mouth part 3 there.

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With the connection described above, the final seal between the plastic and the metal part is also produced. For this purpose, in the metal mouth part 3, between its bottom 30 and the top 31, a circumferential Confiscation 9 incorporated. This recess 9 points so far inwards that they sit on the mouth edge 6 can what happens when bending the bending surfaces 70. The sealing ring 4 is pressed into the recess 5, in which it then develops its sealing effect (left half of the drawing).

For the sake of completeness, reference is also made to the fact that at the mouth 10 of the metal mouth part 3, As is known, the tightening part 11 of a cover bayonet lock is located, which allows the further use of the previously common Metal lid allows.

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10 4 9 4 Summary

For connecting tubular plastic and metal parts, in which a metal mouthpiece is placed liquid-tight and temperature-resistant on a plastic pipe socket is, a beaded edge (7) is provided on the underside (30) of the metal mouth part (3), which is in a plurality individual bending surfaces (70) which can be bent around a shoulder (8) of the plastic pipe socket (2).

In addition, between the plastic pipe socket (2) and a sealing ring (4) is inserted into the metal muzzle part (3), which when the bending surfaces (70) are bent over from a recess (9) in the metal mouth part (3) is pressed into a seat (recess 5).

The connection is preferably used for filler necks of plastic fuel tanks, in automotive cooling systems and in similar areas.

Illustration

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Reference number

1 Filler neck 2 Plastic pipe socket 3 Metal muzzle part 30th Bottom (of 3) 31 Top (of 3) 4th Sealing ring 5 Depression (at 6) 6th Mouth rim (of 2) 7th Beaded edge

70 bending surfaces (of 7)

8 paragraph (an 2)

9 confiscation (at 3)

10 mouth (of 3)

11 tightening part (for cover)

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Claims (1)

lift)> ·· · * Il Il III «· t« 10 4 9 4 ELBATA INE R Plastic and packaging community mbH 7505 Ettlingen, Germany Connection of tubular plastic and metal parts Expectations 1. Connection of tubular plastic and metal parts, in which on a plastic pipe socket a metal mouth part is liquid-tight and is put on temperature-resistant, characterized in that the dimensionally stable connection of the plastic and of the metal part on the underside (30) of the metal mouth part (3) a beaded edge (7) is arranged, which protrudes over a shoulder (8) of the plastic pipe socket (2) and ■ » j J i> · a ■ ft »J 1 ■» «·» ■ IS J> III Il I * · ■ that in a.3 multitude of individual, separated from each other Bending surfaces (70) is divided, which can be bent to produce the connection up to its flat contact on the shoulder (8) are and that at the transition point from the plastic pipe socket (2) an elastic sealing ring (4) is inserted into the metal mouth part (3). 2. Compound according to claim 1,
characterized in that a recess (5) is provided on the mouth edge (6) of the plastic pipe socket (2) to accommodate the sealing ring (4). 3. Connection according to claims 1 and 2, characterized in that that to generate the sealing force in the metallic mouth part (3) an inwardly facing, circumferential Retraction (9) is arranged, which is when bending the bending surfaces (70) on the Sealing ring (4) and on the mouth edge (6) of the plastic pipe socket (2). 494 October 29, 1981