DE202014000625U1 - molding - Google Patents

Abstract

Molded part (1) with at least one shaped portion and at least one end-side connecting portion, in particular hub portion (14, 15), characterized in that the molded part (1) is formed in several parts, wherein a at least one shaped portion (2) forming the hollow form element (20) and the at least one connecting portion (14, 15) forming the tubular member (10) is provided and the mold-hollow element (10) on the tubular member (10) is arranged and fixedly connected thereto.

Description

The invention relates to a molded part with at least one shaped portion and at least one end-side connecting portion, in particular hub portion.

Molded parts are known in various configurations in the prior art. Here are known in particular so-called ball sleeves, which are made as a forged part or solid material machining or as extrusions or molded parts. In this case, a bulged-out ball section is formed with hub sections adjoining these at the end, which are usually cylindrical in shape. Accordingly, the ball portion has a much greater wall thickness than the end subsequent tubular hub portions. Through the ball sleeve through a passage opening extends. Various such ball sleeves are, for example, in the prior art of DE 12 14 872 B . WO 2006/018005 A1 . WO 2012/038180 A1 . DE 10 2006 043 930 A1 . WO 2007/056123 A1 . WO 2008/119344 A2 . DE 10 2010 003 959 A1 disclosed. It is also known to form a ball socket to the effect that this, as in the WO 2012/059314 A1 discloses a crowned portion having approximately the same wall thickness as the end-side hub portions of the ball sleeve. This molded part in the form of a ball sleeve thus has no passage opening with a uniform diameter, but in the shaped portion or spherical area a spherical cavity with a correspondingly larger diameter than in the two end-side hub portions.

In the design of the molding with a much larger wall thickness in the region of the molded spherical portion compared to the approximately cylindrical end hub portions, a large material consumption is required, and there are large unsprung masses, which in the exemplary reuse of the molding for the production of a ball and socket joint for a motor vehicle can be negatively perceived as unsprung large mass just in the wheel of the vehicle. When in the WO 2012/059314 A1 As compared with the disclosed ball socket, the material consumption is lower in comparison with that, so that also the mass is smaller as compared with the formation of the molded section of solid material. However, the production of such a shape of the ball sleeve according to the WO 2012/059314 A1 much more expensive and therefore more expensive, since the shaped portion must be brought in doubt from a previously cylindrical tubular element in the desired shape, the ends or end-side hub portions of the ball sleeve should continue to be cylindrical or in the desired shape.

It is therefore the object of the present invention to provide a molded part with at least one shaped section and at least one end-side connecting, in particular hub section, which has a much lower unsprung mass compared with the formation of the molded section of solid material. It should be possible to easily different variants with respect to the position of the molded portion and thus the length of the at least one end-side connecting portion may be formed and the molding should, compared to the design of the molding, as shown in the WO 2012/059314 A1 is disclosed, cheaper and easier to manufacture.

The object is achieved for a molded part according to the preamble of claim 1, characterized in that the molded part is formed in several parts, wherein a forming the at least one molded portion forming hollow member and the at least one connecting portion forming tubular member and the mold-hollow member on the arranged tubular element and is firmly connected thereto. Further developments of the invention are defined in the dependent claims.

Thereby, a molded part is created, which is more cost effective and easier to produce than the known one-piece moldings due to its multi-part, in particular bipartite. The at least two hollow members are assembled and fastened together, the shaped hollow member being configured in the desired shape to form the shaped portion of the molded part, and the other member, the tubular member, for optimally forming the end-side connecting, in particular hub portions can be configured. For example, it is possible to provide a commercially available tubular element with a desired inner diameter on the outside with a shaped hollow element designed in the desired shape and to connect both elements with each other in a suitable manner. The shaped hollow element has, in particular, a bulbous shape and a passage opening for receiving the tubular element. The shaped hollow element can be arranged at any point along the longitudinal extension of the tubular element and connected there with this. So it is any, with respect to the tubular member axial arrangement of the mold-hollow element on the tubular member possible. In order to be able to form variants with regard to the shaping and the position of the shaped section along the longitudinal extension of the molded part in conventional one-part molded parts, tool change sets are used required. These are no longer necessary due to the now proposed multi-part of the molding, thus any variant formation of the molding with respect to the shape of the mold hollow member and the tubular member, the position of both, the wall thicknesses of both and the lengths and diameters of both possible.

The tubular element may be formed approximately cylindrical prior to connection to the mold-hollow element. Of course, a different shape is possible in principle, such as a conical shape. At the end, the tubular element has end portions which serve to form the end-side connecting portions of the molded part. These serve to connect the molding with other parts or devices, such as in particular a hub, so that in this case the connecting portion is formed as a hub portion. The at least one connecting, in particular hub portion of the molding can be cylindrical and / or conical. Accordingly, the end portions of the tubular member forming the connecting portions of the molding may be formed from an original cylindrical to an expanded cylindrical and / or into an at least partially conical shape. This can be done in particular by widening the end sections or the at least one end section of the tubular element. Advantageously, such a widening takes place after the mold hollow element has been slid onto the tubular element, such that the widening, in particular of the two end sections of the tubular element, firmly bonds the molded hollow element and the tubular element together by press fit. In this case, there is thus a joining by forming the two joining partners of the mold hollow element and the tubular element for generating a press fit, in particular when expanding the inner, ie the tubular, element.

In order to further improve the joining of the two elements, the molded hollow element and the tubular element, the tubular element can be provided with at least one device for stronger or even easier connection to the shaped hollow element, in particular at least one groove and / or knurling be. By providing a groove, knurling or a similar indentation, it is possible to enable and support a claw or a better clawing of the form hollow element and tubular element. Additionally or alternatively, it is possible to firmly connect the mold-hollow element and the tubular element by material connection, in particular by welding. When providing a cohesive bonding method for connecting the molded hollow element and the tubular element, expansion of the end sections or end sections of the tubular element forming the hub sections is not or not absolutely necessary. However, however, these can also be widened if the gap between the tubular element and the openings in the hollow form element is too large to close it by a weld can.

For example, the molded part serves as the basis for a ball and socket joint, which is used in particular in the wheel / chassis area and for other vibration damping elements, in particular of a vehicle. Since the shaped hollow element has a significantly lower weight compared to the formation of the molded part made of solid material, which is forged or machined or extruded or molded, the unsprung masses in the wheel region of a vehicle can also be reduced if the molded part is there, especially in training as a ball and socket joint, is used. By providing a multi-part, in particular two-part, of the molding not only a weight reduction, but also a reduction in manufacturing costs is possible in that a standard pipe section is used as the tubular element and only the hollow form element is designed in the desired shape, this by Various forming methods can be brought into the desired shape, such as by compression molding and / or turning. The molded hollow element can therefore also be formed as a pressed part, in particular also in the form of two mating or assembled half shells. As a result, the shaping is even cheaper and easier to achieve compared to the formation of a one-piece mold hollow element and in particular in comparison to the formation of a forged molded part, so that a further cost reduction is possible in this case.

When forming the hollow form element as a rotating part of this is advantageously provided in one operation with the desired shape. The multi-part design of the molded article proves particularly advantageous when the diameter ratio of the diameter of the hollow shaped element and the diameter of the tubular element is greater than 1.5. Especially when using the molding as the basis for a ball and socket joint this z. B. provided on the outside with rubber material. If the difference in the diameter of the molded portion and connecting portion (s) is large, the prior art molded parts would have the problem that the radius would also be large in the transition region between the molded portion and the connecting portion (s). With a large diameter of the molded portion or a large difference in diameter of the molded portion and connecting portion (s) To each other, a small amount of rubber or so-called rubber track is provided on the shaped portion, so that it may cause tearing of the rubber layer. Further, the material of the molding may tear during the molding process in the large radius transition region. Furthermore, a large transition radius, among other things, also leads to a large or larger installation space of the bearing comprising the molded part.

A small transition radius would be desirable, but can not be achieved with the solutions of the prior art, since it must be possible to redirect the material of the molding during the upsetting process. Narrow or sharp material deflections can not be realized. By providing a multi-part of the molded part according to the invention, the molded hollow element and the tubular element can have a wide variety of inner and outer diameters, since they are not in one piece but are connected to one another in particular by press-fitting under expansion of the tubular element. Thus, even small radii can be generated in the transition region from the shaped portion to the connecting portions. In contrast to the prior art, therefore, the radius in the transition region is not limited by the material property of the molded hollow element and the tubular element. Rather, a small radius can be provided in the transition region from the molded portion to the connecting portions, regardless of the material properties of the molded hollow element and the tubular element. By doing so, even an extremely large-diameter mold hollow member can be easily combined with a tubular member having a much smaller diameter and joined to form small radii in the transition portions from the molded portion to the connecting portions. Conversely, even a small diameter mold member can be easily connected to any tubular member, optimally the mold member can be slid onto it at least from one end of the tubular member for mounting on the tubular member.

Furthermore, with a diameter ratio of the molded hollow element to the tubular element or the end-side connecting sections of the molded part of more than 1.5, there is a clear weight and cost advantage over the formation of the solid molded article, as in the latter, for example, by forging or machining high cost in manufacturing arises due to the large diameter ratio of the molded portion compared to the connecting or hub portions. This also leads to high costs and due to the large wall thickness of the molded portion otherwise also to a high weight of such a molded part made of solid material. These disadvantages can thus also be avoided by the multi-part, in particular bipartite, of the molding according to the present invention.

The shaped hollow element and the tubular element may have the same wall thickness or approximately the same wall thickness. It is also possible to provide different wall thicknesses of molded hollow element and tubular element to the mold-hollow element z. B. easier to transform into the desired shape. In particular, the tubular element may have a greater wall thickness than the shaped hollow element in order to provide a higher strength and dimensional stability in the region of the connecting portions of the molded part, which are formed by the ends or end portions of the tubular member as in the region of the molded portion the molded part formed by the molded hollow member.

In order to achieve these different strengths of the individual sections of the molding, it is also possible to use different materials for the molding hollow element and the tubular element. For example, the molded hollow member may be formed of a readily deformable material, such as, in particular, a readily deformable metal, and the tubular member may be made of a high strength material, such as high strength steel. This also according to the different tasks that have to fulfill the individual sections of the molding after its completion in the reuse, for example, in a ball and socket joint, can be realized.

Of course, it is also possible to use the same materials or materials with approximately equal toughness and strength for the formation of the molded hollow element and the formation of the tubular element. The choice of material can be made as well as the choice of the wall thickness of mold-hollow element and tubular element depending on the particular application or future intended use of the molded part.

It is also possible, at least partially, to form the shaped hollow element and / or the tubular element in multiple layers, thereby in particular to increase the wall thickness in the area of at least one connecting section. By such an at least partial multi-layer, it is possible to provide sections of different stiffness along the extension of the molded part in the axial direction as well as in the radial direction with respect to the molded part. It is also possible only in sections to apply multiple layers of the respective material of the molding Hollow element and / or the tubular member may be provided. If, for example, a comparatively small wall thickness is sufficient for a desired strength of a tubular element, a material doubling or multilayering may be advantageous in some cases to create the required geometrical dimensions, since in principle a tubular element and a hollow shaped element made of a thin material will be less expensive than out a thicker material and due to the material multi-layer yet all strength requirements can be optimally met.

For further explanation of the invention embodiments of this will be described in more detail below with reference to the drawings.

These show in:

1 a longitudinal sectional view of a tubular element according to the invention of a molded part according to the invention,

2 a longitudinal sectional view of a molded hollow element according to the invention of a molded part according to the invention,

3 a longitudinal sectional view of the assembled elements after 1 and 2 before the injection or expansion process,

4 a longitudinal sectional view of the elements according to 1 and 2 assembled and finished molded part according to the invention with widened hub portions and eccentrically with respect to the longitudinal extent of the tubular member arranged on this and compressed hollow shaped element,

5 a longitudinal sectional view of an alternative arrangement possibility of the mold hollow element according to the invention according to 2 on the tubular element according to the invention according to 1 approximately in relation to the longitudinal extent of the tubular element of central arrangement,

6 a longitudinal sectional view of the finished molded part in the arrangement of the molded hollow element and tubular element according to 5 , wherein the two elements are joined by compression, and

7 a perspective view of an alternative embodiment of a molded part according to the invention, in which form-hollow element and tubular element are joined by welding.

1 shows a longitudinal sectional view of a tubular element 10 , The tubular element 10 has an inner diameter d _i and an outer diameter d _a . Furthermore, the tubular element 10 a wall thickness w ₁ on. The tubular element 10 can have any length, depending on what one from this to be formed and in the 4 . 6 and 7 Shown molding 1 should be used. The molding 1 For example, it may serve as a base for making a ball and socket joint for a motor vehicle used in its wheel area. The length l _{10 of} the tubular element 10 can therefore be selected application-specific. The tubular element 10 has a substantially cylindrical shape with internal passage opening 11 and two end sections 12 . 13 on.

In 2 is a shaped hollow element 20 shown in longitudinal section view. This is bulged or spherical as a hollow body with two end openings 21 . 22 and an internal cavity 23 formed so that there is a through-hole, which is in the region of the inner cavity 23 has a larger diameter than in the region of the openings 21 . 22 , The openings 21 . 22 may have a different opening diameter d ₂₁ , d ₂₂ . In the in 2 embodiment shown, however, the two opening diameter d ₂₁ and d _{22 are} about the same size. The two opening diameters d ₂₁ and d ₂₂ are due to the bulbous configuration of the mold hollow element 20 smaller than the maximum inner diameter d _imax in the inner cavity 23 the molded hollow element 20 and, correspondingly, also the maximum outer diameter d _{amax of} the shaped hollow _element 20 , The molded hollow element 20 also has a wall thickness w ₂ and a height or length l ₂₀ .

The molded hollow element 20 can be produced by any forming process, for example as a rotary part and / or as a press or deep-drawn part or as a tubular molding (formed by upsetting a tube). In particular, it is possible, the mold-hollow element 20 from several parts, in particular two half-shells, merge, each of which is formed by itself for example by pressing or deep drawing.

3 shows a possibility of the assembled elements 10 and 20 , wherein the shaped hollow element 20 on the outside 16 of the tubular element 10 is deferred. The two opening diameters d ₂₁ and d _{22 of} the two openings 21 . 22 the molded hollow element 20 are about the same and slightly larger than the outer diameter d _{a of} the tubular element 10 dimensioned to the mold hollow element 20 good outside on the tubular element to postpone.

At the in 3 embodiment shown is the mold-hollow element 20 except for Center of the longitudinal extension of the tubular element 10 , So offset to the half of the length l _{10 of} the tubular element 10 arranged, whereas at the in 5 embodiment shown, the mold-hollow element 20 with its center of the longitudinal extent along the length l ₂₀ about half the length l _{10 of} the tubular element 10 is arranged. This can 5 be easily inferred, since the respective centers of m ₁₀ = ₁₀ l / 2 and l = m _{20 20/2} of the respective longitudinal extension of l ₁₀ and l ₂₀ congruently one above the other, while they are at 3 have a distance a from each other.

To the tubular element 10 and the mold cavity 20 firmly connect with each other, the end sections 12 . 13 of the tubular element 10 widened. Both in the embodiment according to 4 as well as in the embodiment according to 6 Here is a cylindrical expansion of the end sections 12 . 13 intended. Accordingly arise on the finished molding 1 about cylindrical hub sections 14 . 15 having a larger outer diameter d _a14 , d _a15 than the end portions of the tubular member 10 before the end-side expansion, ie d _a <d _a14 or d _a <d _a15 . By the expansion of the end sections 12 . 13 of the tubular element 10 to the hub sections 14 . 15 puts the outside 16 of the tubular element 10 inside the openings 21 . 22 the molded hollow element 20 on or holds by press fit there. This creates a strong connection of tubular element 10 and shaped hollow element 20 , Alternatively or additionally, a groove or knurling 17 . 18 or otherwise on the outside 16 of the tubular element 10 be provided (see 6 ), in which the wall 24 the molded hollow element 20 in the area of their openings 21 . 22 engages and leads to an even better clawing. This is in 6 indicated. In the embodiment according to 7 is instead of a connection by positive engagement and / or adhesion a cohesive connection of tubular element 10 and shaped hollow element 20 provided here in the form of a gap 25 between the outside 16 of the tubular element 10 and the openings 21 . 22 filling weld 26 , This weld 26 corresponds to the space requirements rather a small transition radius, resulting in the further processing of the molding 1 z. B. to a camp or Kugelhülsengelenk proves to be very beneficial.

Basically, the provision of a positive and / or non-positive connection is sufficient and merely by widening of the end sections 12 . 13 of the tubular element 10 cost feasible. Nevertheless, it may also be useful from case to case to provide a material-tight and thus absolutely tight connection against the possible ingress of moisture.

Instead of the cylindrical widening of the end sections 12 . 13 of the tubular element 10 These can also be flared or shaped conical, z. B. when the connecting or hub sections 14 . 15 of the molding 1 are to be conical, in order for the development of the molding 1 for example, to be suitably shaped to a ball and socket joint.

As materials for the tubular element 10 and the mold cavity 20 suitable metals and other formable materials. It can for the tubular element 10 and the mold cavity 20 the same materials are used or, if different materials prove to be advantageous due to their possibly different stiffness or strength, also different materials. Accordingly, the tubular element 10 made of a different material than the molded hollow element 20 to B. the hub or connecting sections 14 . 15 stronger than the bulbous shaped section 2 of the molding 1 form, since the latter by bulging shaping of the mold-hollow element 20 is formed.

Furthermore, the wall thickness of both elements 10 and 20 equal, so w ₁ = w ₂ , be. However, it may also be different, especially in combination with the use of different materials for tubular element 10 and shaped hollow element 20 or alternatively, in order to create elements which can be formed with different shapes or elements with different strength. This allows an optimal adaptation to the requirements in the further use of the molding, for. B. at a location in a vehicle, made. In addition to different wall thickness of a single material, a multi-layer may be provided partially or consistently to achieve different strength, or partially different geometric dimensions. The latter can, for example, in the area of the hub sections 14 . 15 prove to be advantageous if the hub to be fitted there have a larger inner diameter than in a simple and stable manner from the tubular element 10 by end-side widening of its end portions 12 . 13 can generate.

The diameter _ratio d _amax to d _a is, like the 4 . 6 and 7 can be taken more than 1.5. The outer diameter d _{amax of} the _molded hollow _element 20 is therefore more than 1.5 times as large as the outer diameter d _{a of} the tubular element 10 , Especially with such a diameter _ratio of outer diameter d _{amax of} the mold hollow _element 20 to outer diameter d _{a of} the tubular element 10 shows the cost and weight advantage of the solution according to the present invention particularly strong the formation of the molding of solid material. By assembling the molding 1 from several parts 10 . 20 a large geometric variance is possible and, as mentioned, the use of different materials and / or wall thicknesses in individual sections of the molding 1 , each optimally adapted to the respective requirements at the later installation or use of the molding 1 , Furthermore, in the transition region of the mold hollow element 20 to tubular element 10 , ie in the area that is in 7 with the reference number 26 is characterized, a slight or narrow rounding, thus the provision of a smaller transition radius possible, in particular a transition radius less than 10 mm, resulting in advantages in the further use of the molding for forming z. B. a joint stock or the like leads. Furthermore, limit the material properties of mold hollow element 20 and tubular element 10 not the shape and design of the molding 1 in terms of a limitation of the Umformvermögens of their material, in contrast to the one-piece molded parts of the prior art. The molding 1 can be in any shape and any dimensions of its sections 2 . 14 and 15 , so its shaped section 2 and its hub or connecting sections 14 . 15 be formed.

In addition to the embodiments of moldings described above and shown in the figures, numerous other can be formed in which the molding is in each case made in several parts, wherein a molded hollow element forming the at least one shaped portion of the molded part and a tubular element fixedly connected thereto , which forms the at least one connecting portion of the molded part, are provided.

LIST OF REFERENCE NUMBERS

1

molding

2

shaped section

10

tubular element

11

inner passage opening

12

end

13

end

14

hub portion

15

hub portion

16

outside

17

Nut / knurled

18

Nut / knurled

20

Form hollow element

21

opening

22

opening

23

inner cavity

24

wall

25

gap

26

Weld / radius / transition area of 2 to 14 or 2 to 15

d _i

Inside diameter of 10

d _a

outer diameter

d ₂₁

Opening diameter

d ₂₂

Opening diameter

d _a14 , d _a15

Outside diameter of 14 respectively. 15

_imax

maximum inner diameter of 20

d _amax

maximum outside diameter of 20

w ₁

Wall thickness of 10

w ₂

Wall thickness of 20

l ₁₀

length of 10

l ₂₀

length of 20

₁₀

Middle of the longitudinal extension of 10 (m = l _10/2 )

m ₂₀

Middle of the longitudinal extension of 20 (m = l _20/2 )

a

distance

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 1214872 B [0002]
• WO 2006/018005 A1 [0002]
• WO 2012/038180 A1 [0002]
• DE 102006043930 A1 [0002]
• WO 2007/056123 A1 [0002]
• WO 2008/119344 A2 [0002]
• DE 102010003959 A1 [0002]
• WO 2012/059314 A1 [0002, 0003, 0003, 0004]

Claims (19)

Molded part ( 1 ) with at least one shaped section and at least one end-side connecting section, in particular hub section ( 14 . 15 ), characterized in that the molded part ( 1 ) is formed in several parts, wherein the at least one shaped portion ( 2 ) forming mold hollow element ( 20 ) and the at least one connecting section ( 14 . 15 ) forming tubular element ( 10 ) and the mold hollow element ( 10 ) on the tubular element ( 10 ) is arranged and firmly connected to this. Molded part ( 1 ) according to claim 1, characterized in that the shaped hollow element ( 20 ) a bulbous shape and a passage opening ( 21 . 22 . 23 ) for receiving the tubular element ( 10 ) having. Molded part ( 1 ) according to claim 1 or 2, characterized in that the tubular element ( 10 ) prior to bonding to the mold cavity ( 20 ) is approximately cylindrical. Molded part ( 1 ) according to one of the preceding claims, characterized in that the at least one connecting section ( 14 . 15 ) of the molded part ( 1 ) is cylindrical and / or conical. Molded part ( 1 ) according to one of the preceding claims, characterized in that the shaped hollow element ( 20 ) and the tubular element ( 10 ) are firmly connected by press fit. Molded part ( 1 ) according to one of the preceding claims, characterized in that the shaped hollow element ( 20 ) and the tubular element ( 10 ) by material bond, in particular by welding ( 26 ), are firmly connected to each other. Molded part ( 1 ) according to one of the preceding claims, characterized in that the diameter _{ratio of} the diameter (d _amax ) of the hollow _{shaped element} ( 20 ) and the diameter (d _a ) of the tubular element ( 10 ) is greater than 1.5. Molded part ( 1 ) according to one of the preceding claims, characterized in that the material of the shaped hollow element ( 20 ) of the tubular element ( 10 ) is different. Molded part ( 1 ) according to claim 8, characterized in that the shaped hollow element ( 20 ) of a readily deformable material, such as a readily deformable metal, and the tubular element ( 10 ) consists of a high-strength material, such as high-strength steel. Molded part ( 1 ) according to one of claims 1 to 7, characterized in that the material of the shaped hollow element ( 20 ) is the same as that of the tubular element ( 10 ). Molded part ( 1 ) according to one of the preceding claims, characterized in that the shaped hollow element ( 20 ) is formed as a pressing part, in particular in the form of two zusammenfügbarer or assembled half shells, or as a tubular molding. Molded part ( 1 ) according to one of the preceding claims, characterized in that the shaped hollow element ( 20 ) is designed as a turned part. Molded part ( 1 ) according to one of the preceding claims, characterized in that the shaped hollow element ( 20 ) has a different wall thickness (w ₂ ) than the tubular element ( 10 ) having. Molded part ( 1 ) according to one of claims 1 to 12, characterized in that the shaped hollow element ( 20 ) and the tubular element ( 10 ) have the same wall thickness (w ₁ , w ₂ ). Molded part ( 1 ) according to one of the preceding claims, characterized in that the shaped hollow element ( 20 ) and / or the tubular element ( 10 ) is at least partially multi-layered / are. Molded part ( 1 ) according to one of the preceding claims, characterized in that the tubular element ( 10 ) with at least one means for tighter connection to the mold-hollow element ( 20 ), in particular at least one groove or knurling ( 17 . 18 ) is provided. Molded part ( 1 ) according to one of the preceding claims, characterized in that the transition region ( 26 ) between shaped section ( 2 ) or mold hollow element ( 20 ) and connecting section ( 14 . 15 ) or tubular element ( 10 ) is provided with a smaller narrow radius, in particular a radius of less than 10 mm, and the radius of the material properties of hollow-shaped element ( 20 ) and tubular element ( 10 ) is independent. Molded part ( 1 ) according to one of the preceding claims, characterized in that the shaped hollow element ( 20 ) so on the tubular element ( 10 ), that the centers (m ₁₀ , m ₂₀ ) of the two elements ( 10 . 20 ) are congruently superimposed. Molded part ( 1 ) according to one of claims 1 to 17, characterized in that the shaped hollow element ( 20 ) so on the tubular element ( 10 ) is arranged such that the center (m ₂₀ ) of the molding Hollow element ( 20 ) at a distance (a) from the center (m ₁₀ ) of the tubular element ( 10 ) is arranged.

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