WO2009121509A1

WO2009121509A1 - Crossmember for a bumper of a vehicle and method for the production of a crossmember

Info

Publication number: WO2009121509A1
Application number: PCT/EP2009/002192
Authority: WO
Inventors: Xiangfan Fang
Original assignee: Magna Automotive Services Gmbh
Priority date: 2008-04-03
Filing date: 2009-03-25
Publication date: 2009-10-08
Also published as: DE102008017055A1

Abstract

The present invention relates to a crossmember for a bumper of a vehicle and to a method for the production of a crossmember. The crossmember comprises a main member made of light metal. In order to create a crossmember exhibiting good behavior during an accident despite of the low weight thereof, and having a design that is as simple as possible, the invention provides at least one reinforcing structure that reinforces the main member and is attached thereto, said structure extending at least across a section of the length of the main member and being configured from reinforced plastic or steel. For the production of the crossmember, the invention proposes to provide the reinforcement structure on the main member and bend the assembly obtained into a net shape.

Description

Cross member for a bumper of a vehicle and method for producing a

crossbeam

The present invention relates to a cross member for a bumper of a vehicle and a method of manufacturing a cross member.

Cross beams are known, which are made of aluminum in an extrusion process. Made of aluminum, it is possible to produce particularly light cross members, which nevertheless have good deformation behavior. A low weight is particularly desirable for low fuel consumption of the vehicle.

In recent times, however, more and more demanding crash tests have been introduced, in which the cross member is loaded off-center in the vertical direction. An eccentric load plays a role, for example, when the cross member for a sports utility vehicle (SUV) is provided with a fairly high-mounted body or for a sports car with a fairly low-mounted body and meets a shocker normal height. In addition, some vehicle manufacturers have developed pile impact tests in which the cross member is subject to heavy load at certain points.

In order to meet the increased load requirements, considerably more material has to be used for aluminum crossbeams. This almost consumes their weight advantage, compared to pure steel crossbeams.

The present invention has for its object to provide a cross member which has the simplest possible structure despite low weight good accident behavior.

The object is achieved with a cross member having features of claim 1 or 2.

With the formed of light metal main carrier and the steel formed reinforcing structure, a hybrid cross member is created, which surprisingly has good accident properties with low weight. With the reinforcing structure made of steel, the main carrier made of light metal can be specifically reinforced, especially as needed. This makes it possible to continue to make main carrier easy. The added strength gained by the steel reinforcing structure outweighs the excess Weight, so that the cross member can be easily formed as a cross member of comparable strength, which is completely formed, for example, made of aluminum.

With reinforced plastic, similar hardness and / or strength can be achieved as with steel. In this case, a reinforcing structure made of reinforced plastic can be made even easier than a reinforcing structure made of steel.

Advantageously, the main carrier may have a closed cross-section. With a closed cross-section, it can be formed with good torsional rigidity.

Particularly preferably, the main carrier can be produced by extrusion. This is particularly easy form a closed cross-section, if necessary, with a sophisticated cross-sectional shape.

Particularly advantageously, the reinforcing structure, with respect to the mounting position of the cross member on a vehicle, reinforce a vertically upper and / or vertically lower region of the main carrier. In this way, the cross member according to the invention can be designed so that it can absorb particularly well at a vertical offset between its main carrier and an opposing cross member in the overlapping area impact forces by the reinforcement.

Preferably, two spaced-apart reinforcing structures may be provided. This makes it possible to reinforce areas of the main carrier which are remote from one another, for example a vertically upper and a vertically lower area, wherein a vertically central area would be particularly easy to form.

Conveniently, the main carrier can be divided into at least two sections inside and be provided in at least one of the sections, a reinforcing structure. By providing the reinforcing structure in the interior of the main carrier, embodiments are possible in which the main carrier is reinforced, but otherwise, in particular, can maintain its external dimensions. This is particularly advantageous when little space is available for the cross member.

Preferably, the main carrier may have holding elements which protrude into the interior and hold the reinforcing structure in their section. With the holding elements structures for holding the reinforcing structure can be formed in a material-saving manner. Particularly advantageously, a dividing wall separating the sections can be provided which holds the reinforcing structure in its section. In addition to the holding function of the partition can be increased with it, the bending and torsional strength of the main profile.

Conveniently, the outer shape and the outer dimensions of the reinforcing structure may correspond to the inner shape and the inner dimensions of its portion. Hereby, a substantially flush contact of the reinforcing structure to the main carrier can be realized, wherein the reinforcing structure can stabilize walls of the main carrier in particular well.

Particularly favorable may be provided with a closed cross section, a reinforcing structure. The closed cross-section gives the reinforcing structure a good torsional rigidity. Such a reinforcing structure is particularly well suited for stiffening the main carrier with respect to torsional stresses.

Preferably, a reinforcing structure having an open cross section may be provided, which is closed by a closing arrangement. Thus, the reinforcing structure, despite its open cross-section torsion stresses oppose a good resistance. With an open cross section, the reinforcing structure is particularly easy to produce.

Advantageously, the closing arrangement can be formed integrally with the main carrier. Thus, the reinforcing structure can be held with the closing arrangement on the main carrier and forces can be transmitted between the two via the closing arrangement. If the main carrier is produced by extrusion, the closing arrangement can be easily formed in one piece with the main carrier.

Preferably, the closing arrangement can have groove-like receiving spaces in which ends of the reinforcing structure can be accommodated. In this way, the ends of the reinforcing structure are particularly easy to connect to each other.

Particularly favorable, the reinforcing structure may be provided on the outside of the main carrier. For example, forces can be introduced via the reinforcing structure into the main carrier.

In a development of the invention, the reinforcing structure can widen the main carrier transversely to its longitudinal direction. In this way, the reinforcing structure increases an NEN possible overlap region of the cross member with a Aufprallhindemis, for example, an opposing bumper.

Preferably, the reinforcing structure may have an approximately U-shaped cross-section, with the main carrier extending in regions through the reinforcing structure. As a result, the reinforcing structure can be designed to save weight and still be easily connectable to the main carrier.

Particularly advantageously, the reinforcing structure made of ultra-high-strength steel. This material offers good strength even at low material thicknesses, which benefits a lightweight design and / or a compact design.

Separate protection is claimed for a bumper with at least one cross member according to the invention.

Furthermore, protection is claimed for a vehicle having at least one bumper according to the invention and / or at least one cross member according to the invention.

The present invention is also based on the object to provide a manufacturing method for a cross member.

This object is achieved by a manufacturing method with the features of claim 21.

By bending the assembly of the main carrier and the reinforcing structure into the final shape, the main carrier and the reinforcing structure are given corresponding end shapes to each other.

With this method, it is even possible to produce cross beams whose main carrier has a final shape in which the reinforcing element would no longer be providable in the desired manner to the main carrier. An example of this would be a hollow-profile main support, in the interior of which a reinforcement structure is to be positioned, and which in its final form has curved ends, through which the reinforcement structure would no longer be able to be inserted into the desired shape into its interior.

Advantageously, the reinforcing structure can be fixed in position on the main carrier by the aforesaid bending. In this way, bending can have a dual function fulfill, namely the bringing of the assembly in its final form and said fixing.

Particularly preferably, a reinforcing structure can be provided on the outside of the main carrier.

Particularly favorable at least one reinforcing structure can be provided in the interior of the main carrier.

Preferably, the reinforcing structure may be made by a hot forming process. With this method, the reinforcing structure is easily deformable.

Preferably, the reinforcing structure may be made by a cold forming process. It is possible to provide consolidations in the reinforcing structure by the cold forming process.

Embodiments of the present invention are shown in the figures and will be explained below. Show it:

1 shows a sectional view of a cross member according to the invention of a first embodiment and associated with him continuation of a longitudinal structure of a vehicle in a perspective view,

FIG. 2 shows a cross-sectional view of the cross member from FIG. 1,

FIG. 3 shows a sectional representation of a cross member according to the invention of a second embodiment and a longitudinal structure of a vehicle connected to it in a perspective view,

FIG. 4 shows a cross-sectional view of the cross member from FIG. 3,

5 shows a sectional view of a cross member according to the invention of a third embodiment of the invention and an associated longitudinal structure of a vehicle in a perspective view,

FIG. 6 shows a cross-sectional view of the cross member from FIG. 5, 7 shows an illustration of a cross member according to the invention of a fourth embodiment of the invention and an exemplary associated longitudinal structure of a vehicle in a perspective view,

FIG. 8 shows a cross-sectional view of the cross member from FIG. 7,

9 shows an illustration of a cross member according to the invention of a fifth embodiment of the invention and an example of the associated longitudinal structure of a vehicle in a perspective view and

FIG. 10 shows a cross-sectional view of the cross member from FIG. 9.

In the embodiments described below, like reference numerals are used for like elements.

Cross members may be part of a bumper of a vehicle and are usually attached to a longitudinal structure of a vehicle, for example on a longitudinal member or on a crash box, which is upstream of a longitudinal member. 1 shows a cross member 1 of a first Ausführuπgsform of the invention in a sectional perspective view and a connected to the cross member 1 crash box. 2

The cross member 1 may be provided substantially transversely to the longitudinal direction of the vehicle at this. It has an elongated main support 3, which is formed of light metal, for example of aluminum or magnesium. The main carrier 3, can be made by extrusion.

The cross member 1 further comprises at least one reinforcement structure reinforcing the main support 3 and attached thereto, which extends at least over a portion of the length of the main support 3. In this embodiment of the invention, two steel reinforcing structures 4, 5 are provided.

To counteract contact corrosion between the light metal and the steel material, coated steel material may be used, or the at least one reinforcing structure and / or the main carrier may be provided with a resist by cathodic dip painting.

The interior of the main carrier 3 is subdivided with respect to its cross section into three sections, namely into two outer sections 6, 8 and an intermediate middle Section 7. The two reinforcing structures 4, 5 are provided in the two outer sections, that is, are spaced from each other.

In the present embodiment, the first outer portion 6 of the main carrier 3 is a vertical upper portion and the second outer portion 8 is a vertically lower portion with respect to a mounting position of the cross member to a vehicle. That is, the cross member is reinforced in the vertically upper and in the vertically lower portion of the main carrier 3.

For example, a vertically upwardly reinforced main support for vehicles with particularly low arranged bumper may be provided, as is the case for example with sports cars. Meets a bumper with such a cross member on a higher bumper arranged, the cross member is well reinforced in the particularly loaded contact area of the bumper. Conversely, main beams for vehicles with a relatively high-ranking bumper, as is the case for example in a so-called sports utility vehicle (SUV), can be reinforced vertically below. If a bumper with such a cross member strikes a lower bumper, the cross member is well stabilized in the particularly loaded contact area.

In this way, the cross member according to the invention is weight-optimized reinforced, in particular it has a lower weight in the region of its center than outside the center.

In this embodiment of the invention, the reinforcing structures 4, 5 extend over the entire length of the main carrier 3. However, it is also possible that extends at least one reinforcing structure only over a part of the length of the main carrier. For example, the main carrier may be partially reinforced in a section between two crossbeam carrying crash boxes or side members of the vehicle. In this way, the cross member in the said area record particularly well loads and forward to the crash boxes or side members, in particular punctual loads, as they may occur in a collision with a pole or tree.

The reinforcing structures 4, 5 and the cross member 3 each have a closed cross-section, which, taken by itself, gives them a good torsional rigidity. The outer shape and the outer dimensions of the reinforcing structures 4, 5 correspond to the inner shape and the inner dimensions of their respective section 6, 8. This results in a substantially flush and / or form-liquid contact with the main carrier, thereby O

the reinforcing structures 4, 5 well support the walls of the main carrier 3 and stabilize the main carrier 3 well against bending and torsional stresses.

The main carrier 3 has, starting from side walls 9, 10 in its interior extending holding elements 11, 12, 13, 14, which hold the reinforcing structures 4, 5 securely in their intended section 6, 8, as is apparent from Figure 2. In this embodiment of the invention, the holding elements extend over the entire length of the main carrier 3 and are formed approximately rib-like or rail-like. In this way they reinforce the side walls 9, 10 in addition to bending stresses, in particular against bending transversely to the longitudinal direction of the respective side wall.

However, it is also possible to securely hold the reinforcing structures 4, 5 in their respective sections 6, 8 in other ways. In addition, other divisions of the sections are possible, fewer or more sections may be provided, at least one of the reinforcing structures may be provided in another section, and more reinforcing structures or only one reinforcing structure may be provided.

As shown in Figure 1, the cross member 1, in particular the main carrier 3, impressions 15, with which additionally a form-liquid connection between the main carrier 3 and the respective reinforcing structure 4, 5 is provided. As a result, torsional stresses are even better transferable to the relevant reinforcing structure.

The side walls 9, 10 may have the same or different wall thicknesses.

With the at least one reinforcing structure formed of steel, a light metal-steel hybrid cross member is formed, which has a high bending and torsional strength, wherein the cross member is compact and can be produced at a reasonable cost. Although it would be possible to form a cross member with a total of equal strengths and stiffnesses completely made of light metal, however, an enormous use of material is necessary, which means considerable costs, since light metal is usually more expensive than steel.

You could also train the cross member completely made of steel, which can easily realize the desired strength and stiffness. However, such a cross member is quite heavy due to the high density of the steel and usually more expensive to manufacture. If aluminum is used as light metal in the cross member 1 according to the invention, the cross member would have only a slight weight disadvantage compared to a full aluminum cross member. Compared to a full steel crossbeam, however, he has a significant weight advantage.

The steel used is preferably ultra-high-strength steel, which is also available under the

N tion UHSS is known and can have tensile strengths of up to 1500 - _τ . On this mm '

In this way, good strength and rigidity can be achieved with little use of steel. Thus, the cross member can be made particularly light or particularly resistant compared to less solid steel.

Reinforcement structures made of reinforced plastic can be used instead of reinforcing structures made of steel. It is possible to achieve similar hardnesses and strengths with reinforced plastic as with steel.

It is also possible to use a combination with at least one steel reinforcing structure and at least one plastic reinforcing structure.

As material for the main carrier 3, for example, AI 6082 can be used, such as AI 6082 T5, or AI 6082 Tβ.

In Figures 3 and 4, a cross member 21 of a second embodiment of the invention is shown. This cross member 21 differs from the cross member of the first embodiment in that its main carrier 23 instead of the rib or rail-like holding elements between the side walls 9, 10 extending partitions 31, 32 has. Otherwise the same applies to the cross member 1 of the first embodiment.

The partitions fulfill the function of a holding element and stabilize the cross member in addition. On the one hand, the main carrier 23 itself is resistant to bending and torsion through the partitions. In addition, the partitions and a corresponding wall 36, 37 of the respective reinforcing structure 4, 5 are supported on each other.

The partition walls 31, 32 have a different wall thickness than the side walls 9, 10 of the main carrier 23. In this embodiment of the invention, they are thinner than the side walls 9, 10th In contrast to the second embodiment of the invention, reinforcing structures of discontinuous or open cross-section are used. Although such reinforcing structures are easier to produce, they have a torsional strength better than the cross-sectional structures with the closed one Cross-section In addition, they tend to bend their cross-sectional ends at a bending load transversely to their Längsnchtung, which reduces the flexural rigidity and strength

By connecting the cross-sectional ends 44, 47, 48, 49, between which there is the interruption, it is possible to still produce a similar torsional strength as in a closed cross-section and also to counteract bending Stable profiles are better formed and an undesirable cracking or breaking the Reinforcing structure is encountered

According to the invention, a closing arrangement 50, 51 with groove-like receiving spaces 52, 53, 54, 55 is provided for receiving the cross-sectional ends 46, 47, 48, 49, respectively. In this embodiment of the invention, the closing arrangements 50, 51 are even fixed to the main carrier 43 In this way, not only the Querschnittsseπden 46, 47, 48, 49 are held together, but also held in a particular position to the main carrier 43

In this embodiment of the invention, the closing abutments 50, 51 emstuckig formed with the main carrier 43, wherein the groove-like receiving spaces 52, 53, 54, 55 are formed together with the side walls 9, 10 and partitions 31, 32 of the main carrier The locking assemblies 50, 51 each have an approximately Y-type cross-sectional portion 56, 57

It is possible, instead of the partitions 31, 32 πppen- or rail-like holding elements provided as in the first embodiment of the invention

In contrast to the second embodiment of the invention, no indentations are provided Such embossments could however be formed

Otherwise, what has been said regarding the second embodiment of the invention applies analogously to the third embodiment One or more reinforcing structures may not only be provided inside a main carrier, but alternatively or additionally also outside the main carrier.

FIGS. 7 and 8 show a cross member 61 of a fourth embodiment of the invention, which has a main carrier 63 on which a reinforcing structure 64 is provided on the outside. The main carrier 63 is constructed similar to the main carrier of the second embodiment of the invention, but has thicker side walls 69, 70 and on the side of the vertically upper portion 7 it has curves 71, 72 as shown in FIG. The reinforcing structure 64 has a U-shaped profile corresponding to the outer contour of the main carrier 63.

The reinforcing structure not only reinforces the main beam, but also acts as a broadening of the main beam, seen transversely to its longitudinal direction. The main carrier 63 extends through the reinforcing structure 64 and side walls 74, 75 of the reinforcing structure 64 are fixed to the main carrier 63, namely in the region of the vertically upper outer portion 6 and in the region of the middle portion 7. However, between one of the side walls 74, 75 connecting end wall 73 of the connecting structure 64 and the main carrier 63 is provided a distance. In this way, the reinforcing structure 64 widens the main beam 63. As a result, the cross member 61 has an enlarged overlapping area for impact with a higher-level opposing bumper. Thus, the accident forces can be better distributed introduced into the main carrier 63 according to the invention.

The reinforcing structure 64 may extend the entire length of the main carrier 63. In this embodiment of the invention, it extends only along a part of the length of the main carrier 63 and is approximately centrally disposed thereon. It may extend over a range of about% - V _{2 of} the length of the main carrier, preferably about Y ₃ the length of the main carrier 63 as shown in Figure 7. In this way, the main carrier is reinforced only there and / or provided there only with a larger Überiappungsbe- where this is required, that is, it is weight-optimized reinforced and / or widened.

It is also possible for the reinforcing structure 64 to extend approximately to the position (s) at which the main carrier 63 is connected to a longitudinal structure of the vehicle, for example the crash box 2. The distance between the end wall 73 and the main carrier 63 can also be selected larger or smaller. It is also possible to provide no distance or only a small distance, so that the reinforcing structure essentially has only one reinforcing function.

Instead of a reinforcing structure 64 made of steel or reinforced plastic and a reinforcing structure made of light metal may be provided, for example, aluminum.

Reference is made to what has been said for the preceding embodiments also for the fourth embodiment.

A reinforcing structure may be provided not only vertically above the outside of the main carrier, but alternatively or additionally also vertically below the outside of the main carrier.

FIGS. 9 and 10 show a cross member 81 of a fifth embodiment of the invention, for which the same applies analogously to what has been said for the fourth embodiment of the invention. The cross member 81 of the fifth embodiment of the invention differs from that of the fourth embodiment of the invention in that the reinforcing structure 64 is provided vertically below the main carrier 63.

Below will be discussed in more detail on the production of inventive cross member. The main carrier 3, 23, 43, 63 is preferably produced by extrusion. In this way, it is easily formed with a closed cross-sectional profile and also closing arrangements can be well formed integrally with the main carrier in this way.

As a rule, extrusions are used to produce straight profiles. Often, however, crossbeams seen in the vehicle longitudinal direction must have an approximately wedge-like shape and / or have longitudinal ends bent toward the vehicle, as is indicated by way of example in FIGS. 1, 3, 5, 7 and 9.

According to the invention, the reinforcing structure / reinforcing structures 4, 5, 44, 45 provided for the interior are / are introduced into the essentially straight main beams 3, 23, 43, and this assembly is subsequently bent into a final shape. This creates a frictional and / or positive connection between the at least one reinforcing structure and the main carrier, which fixes the at least one reinforcing structure to the main carrier. When introducing the at least one amplifier I _* 3

kung structure act formed in the interior of the main support retaining elements and / or partitions and / or closing arrangements as Fuhrungsprofile

On the reinforcing structure existing edges, in particular cutting edges, are formed and / or arranged so that when importing the reinforcing structure mechanical Abπeb is avoided on the main carrier

A reinforcing structure of steel may be produced by a sheet metal forming process and / or a so-called roll forming process, in particular an open or interrupted cross-section reinforcing structure. Welding may be used in the manufacture of a closed cross-section reinforcing structure

The forming of the starting material for the reinforcing structure can be carried out by a thermoforming process and / or by a cold forming process

A precoated steel material may be used to form reinforcing structures. Alternatively and / or additionally, the steel material is cathodic-dip-coated after being formed. The light-metal material may also be cathodic-dip-coated

This method can equally be used if at least one reinforcement structure is to be provided on the outside of the cross member, in particular if this reinforcement structure extends over a region of the main support which is to be brought into a final shape by bending

The impressions 15 are formed after bending into the final shape

In the case of a reinforcing profile to be provided on the outside of the cross member, it is also conceivable to bend the reinforcing structure and the main carrier separately relative to each other into a final shape or intermediate shape and then to assemble them

Claims

claims

1. Cross member (1, 21, 41, 61, 81) for a bumper of a vehicle, wherein the cross member may be provided substantially transversely to the longitudinal direction of the vehicle on this and an elongate main carrier formed from light metal (3, 23, 43, 63 ), and at least one reinforcing structure (4, 5, 44, 45, 64) reinforcing the main beam is provided, which extends over at least a portion of the length of the main beam, wherein the reinforcing structure is formed of reinforced plastic.

2. Cross member (1, 21, 41, 61, 81) for a bumper of a vehicle, wherein the cross member may be provided substantially transversely to the longitudinal direction of the vehicle on this and an elongate main carrier formed from light metal (3, 23, 43, 63 ), and at least one reinforcing structure (4, 5, 44, 45) reinforcing the main beam and provided thereon, which extends over at least a portion of the length of the main beam, wherein the reinforcing structure is formed of steel.

3. Cross member according to claim 1 or 2, characterized in that the main carrier (3, 23, 43, 63) has a closed cross-section.

4. Cross member according to one of the preceding claims, characterized in that the main carrier (3, 23, 43, 63) is produced by extrusion.

5. Cross member according to at least one of the preceding claims, characterized in that the reinforcing structure (4, 5, 44, 45, 64) with respect to the mounting position of the cross member on a vehicle, a vertically upper and / or vertically lower portion of the main carrier (3, 23 , 43, 63).

6. Cross member according to at least one of the preceding claims, characterized in that two, spaced from each other, reinforcing structures (4, 5, 44, 45) are provided.

7. Cross member according to at least one of the preceding claims, characterized in that the main carrier (3, 23, 43, 63) in the interior in at least two sections (6, 7, 8) is divided and in at least one of the sections (6, 8 ) a reinforcing structure (4_ 5, 44, 45) is provided.

8. Cross member according to claim 7, characterized in that the main carrier holding elements (11, 12, 13, 14, 31, 32) which extend into the interior and the reinforcing structure (4, 5, 44, 45) in its section (6, 8).

9. Cross member according to claim 7 or 8, characterized in that the sections (6, 7, 8) separating partition (31, 32) is provided which the reinforcing structure (4, 5, 44, 45) in its portion (6 , 8) stops.

10. Cross member according to at least one of claims 7 to 9, characterized in that the outer shape and outer dimensions of the reinforcing structure (4, 5, 44, 45) to the inner shape and the inner dimensions of its portion (6, 8) correspond.

11. Cross member according to at least one of claims 7 to 10, characterized in that a reinforcing structure (4, 5) is provided with a closed cross-section.

12. Cross member according to at least one of claims 7 to 11, characterized in that a reinforcing structure (44, 45) is provided with an open cross section, which is closed by a closing arrangement (50, 51).

13. Cross member according to claim 12, characterized in that the closing arrangement (50, 51) is formed integrally with the main carrier (41).

14. Cross member according to claim 12 or 13, characterized in that the closing arrangement (50, 51) groove-like receiving spaces (52, 53, 54, 55), in which ends (46, 47, 48, 49) of the reinforcing structure (44, 45) are included.

15. Cross member according to at least one of the preceding claims, characterized in that a reinforcing structure (64) is provided on the outside of the main carrier (63).

16. Cross member according to claim 15, characterized in that the reinforcing structure (64) widens the main carrier (63) transversely to its longitudinal direction.

17. Cross member according to claim 15 or 16, characterized in that the reinforcing structure (64) has an approximately U-shaped cross-section, wherein the main carrier (63) extends in regions through the reinforcing structure (64).

18. Cross member according to at least one of claims 2 to 17, characterized in that the reinforcing structure (4, 5, 44, 45, 64) consists of ultra-high-strength steel.

19. bumper having at least one cross member (1, 21, 41, 61, 81) according to at least one of the preceding claims.

20. Vehicle with at least one bumper according to claim (19) and / or at least one cross member according to at least one of claims 1 to 18.

21. A manufacturing method for a cross member (1, 21, 41, 61, 81) of a vehicle, wherein a main carrier (3, 23, 43, 63) of the cross member is formed of a light metal, at least one reinforcing structure (4, 5, 44, 45, 64) is formed, with which the main carrier can be reinforced, the reinforcing structure is provided on the main carrier and the assembly of the main carrier and the reinforcing structure is bent into an end shape.

22. A manufacturing method according to claim 21, characterized in that the Verstärkungsstrut (4, 5, 44, 45) is fixed by said bending in position on the main carrier.

23. A manufacturing method according to claim 21 or 22, characterized in that a reinforcing structure (64) is provided on the outside of the main carrier (63).

24. Manufacturing method according to at least one of claims 21 to 23, characterized in that at least one reinforcing structure (4, 5, 44, 45) in the interior of the main carrier (3), (23, 43) is provided.

25. Manufacturing method according to at least one of claims 21 to 24, characterized in that the reinforcing structure (4, 5, 44, 45, 64) is produced by a hot forming process.

26. A manufacturing method according to any one of claims 21 to 25, characterized in that the reinforcing structure (4, 5, 44, 45, 64) is produced by a cold forming process.