DE102019129013B4 - Body part having a frame structure with a first desired buckling point and a carbon structure with a second desired buckling point, motor vehicle - Google Patents

Abstract

A body part (1), in particular a body part of a motor vehicle (100), is proposed, the body part (1) having a frame structure (2), a carbon structure (3) and a support structure arranged between the frame structure (2) and the carbon structure (3). (4), wherein the frame structure (2) has a first target kink point (S1), wherein the carbon structure (3) has a second target kink point (S2), characterized in that the first target kink point (S1) and the second desired buckling point (S2) is arranged directly one above the other in relation to a main extension plane of the carbon structure (3). Furthermore, a motor vehicle (100) is proposed.

Description

The present invention relates to a body part, in particular a body part for motor vehicles, having a frame structure, a carbon structure and a support structure arranged between the frame structure and the carbon structure, the frame structure having a first desired kink point and the carbon structure having a second desired kink point.

Carbon is a material with a multitude of positive properties. In the manufacture of motor vehicles, it is particularly in demand because of its low weight. By using carbon in the manufacture of large automotive components, a significant amount of weight can be saved, which benefits fuel consumption, maximum possible acceleration and handling. The use of carbon structures is playing an increasingly important role, especially in high-performance motor vehicles. For example, vehicle roofs, doors, flaps, hoods, aprons or air guide elements are partially or even entirely made of carbon.

When using material composites made of carbon and another material, such as a metal like steel or aluminum, there are a few things that need to be considered. Against the background of an increasing need for safety in road traffic, the optimization of the accident behavior of a motor vehicle must be an important point in the design of the motor vehicle. The different behavior of metal and carbon in the event of accidental loads regularly poses a difficulty here.

From the pamphlet DE 10 2015 225 760 A1 It is known to provide a carrier element made of a fiber composite material body on a roof frame of a motor vehicle. For reinforcement, a reinforcement element made of metal is connected to the fiber composite material body. The fiber composite material body is provided with at least one predetermined breaking point in the area of the reinforcement element. The pamphlet DE 10 2014 203 140 A1 discloses a body structure support arrangement with a body structure support made of CFRP, which has a predetermined breaking point in the area of an adjacent metal element. From the pamphlet US 9,676,420 B2 a B-pillar of a motor vehicle with a desired kink point is known.

It is therefore an object of the present invention to provide a body part that does not have the above-described disadvantages of the prior art, but instead exhibits optimized deformation behavior in the event of an accident.

This object is achieved by a body part, in particular a body part of a motor vehicle, the body part having a frame structure, a carbon structure and a support structure arranged between the frame structure and the carbon structure, the frame structure having a first desired kick point, the carbon structure having a second desired Has buckling point, wherein the first desired buckling point and the second desired buckling point are arranged directly one above the other in relation to a main extension plane of the carbon structure.

The body part according to the invention shows a significantly improved deformation behavior compared to generic body parts from the prior art. Due to the fact that the carbon structure and the frame structure have overlying predetermined kinks, the deformation behavior is very well defined and can be precisely adjusted through constructive changes. A predetermined buckling point within the meaning of the present invention is a preferably elongated area of a structure at which the structure buckles or is folded when a force acts on the structure. In other words, a target buckling point is an intentionally created structural weak point of the structure at which the structure first buckles or folds in the event of a crash. It is conceivable that the support structure and/or the frame structure are made of a metal, preferably aluminum and/or steel.

Advantageous configurations and developments of the invention can be found in the subclaims and the description with reference to the drawings.

According to a preferred embodiment of the invention, it is provided that the carbon structure is a carbon roof module. Especially in the case of a side impact with an object with a small diameter, in what is known as a pole crash, the vehicle roof is particularly important for the defined dissipation of impact energy. A carbon roof module within the meaning of the present invention is a module through which the roof of the motor vehicle is formed either completely or at least partially.

According to a further preferred embodiment of the invention, it is provided that the frame structure is a front roof frame. In the event of a pole crash, the roof frame must also meet particularly high demands on its deformation behavior. Through a clever interaction of a targeted deformation of the carbon roof module and the front roof frame, it is possible to reduce the impact energy of a pole crash cleverly dissipate and thus effectively protect the occupants of the motor vehicle.

According to a further preferred embodiment of the invention, it is provided that the second predetermined buckling point is a cutout in the carbon structure, the cutout preferably being a flat cutout in relation to the main extension plane of the carbon structure. This makes it possible in an advantageously simple manner to produce an area of the carbon structure which is structurally weaker and therefore offers a defined point for buckling or folding. It is conceivable that the recess is formed by a reduced wall thickness of the carbon structure. It is conceivable, for example, that the wall thickness of the carbon structure is reduced by 50% or more at the second desired buckling point. It is also conceivable that a main extension direction of the second desired kink point is arranged in the longitudinal direction of the vehicle. Furthermore, it is conceivable that the carbon structure has a further second desired buckling point, the main plane of extension of which is preferably arranged in the transverse direction of the vehicle. It is conceivable that the further, second predetermined buckling point is a further cutout in the carbon structure, with the further cutout preferably being a further cutout which is flat in relation to the main extension plane of the carbon structure. It is conceivable that the further recess is formed by a reduced wall thickness of the carbon structure. It is conceivable, for example, that the wall thickness of the carbon structure is reduced by 50% or more at the other second desired buckling point. It is also conceivable that the second desired kink point and the further second desired kink point are arranged so that they cross one another.

According to a further preferred embodiment of the invention, it is provided that the cutout is U-shaped, V-shaped or I-shaped in relation to the main plane of extension of the carbon structure, the cutout being preferably continuous orthogonal to the main plane of extension of the carbon structure. This advantageously makes it possible to have a good influence on the deformation behavior.

According to a further preferred embodiment of the invention, it is provided that the first desired buckling point is formed by a reduced wall thickness of the frame structure and/or that the first desired buckling point is formed by a reduced formation of one or more stability-promoting geometric structures. This enables the first desired kink point to be produced in a simple manner. Stability-enhancing geometric structures within the meaning of the present invention can be beads and/or welded and/or riveted material reinforcements, for example.

According to a further preferred embodiment of the invention, it is provided that the frame structure is riveted and/or welded and/or screwed to the support structure. This allows a stable connection between the frame structure and the support structure.

According to a further preferred embodiment of the invention, it is provided that the carbon structure is connected to the support structure in a form-fitting and/or force-fitting manner and/or with a material connection, the carbon structure preferably being clipped into the support structure and/or screwed to the support structure and/or to the Support structure is glued. This ensures that the carbon structure is securely fastened. It is conceivable that the carbon structure is glued to the support structure with a bead of adhesive.

According to a further preferred embodiment of the invention, it is provided that the carbon structure is connected to the frame structure in a form-fitting and/or force-fitting and/or material-locking manner, with the carbon structure preferably being clipped into the frame structure and/or screwed to the frame structure and/or to the frame structure is glued. This advantageously provides a combination of the components carbon structure, carrier structure and frame structure which is stable and durable and can be produced with little effort.

According to a further preferred embodiment of the invention, it is provided that the support structure has a third desired kink point, the third desired kink point and the second desired kink point being arranged directly one above the other in relation to a main extension plane of the carbon structure, with the third desired kink point being preferred is formed by a reduced wall thickness of the support structure and/or wherein the third predetermined buckling point is preferably formed by a reduced formation of one or more stability-promoting geometric structures. This further improves the deformation behavior of the body part.

A further object of the invention for solving the problem formulated at the outset is a motor vehicle having a body part according to the invention.

All the details, features and advantages previously disclosed in connection with the body component according to the invention also relate to the motor vehicle according to the invention.

• 1 (a) - (d) illustrieren schematisch ein Karosserieteil gemäß einer beispielhaften Ausführungsform der vorliegenden Erfindung.
• 2 illustriert schematisch ein Kraftfahrzeug gemäß einer beispielhaften Ausführungsform der vorliegenden Erfindung.

Further details, features and advantages of the invention result from the drawings and from the following description of preferred embodiments based on the drawings. The drawings merely illustrate exemplary embodiments of the invention, which do not limit the inventive concept.

• 1(a)-(d) 12 schematically illustrate a body part according to an exemplary embodiment of the present invention.
• 2 FIG. 1 schematically illustrates a motor vehicle according to an exemplary embodiment of the present invention.

In 1 (a) is a schematic of a body part 1 according to an exemplary embodiment of the present invention for a motor vehicle (see 2 ) shown with a view of the body part 1 from above. The carbon structure 3, which is a carbon roof module, is clearly visible. Carbon roof modules have the advantage over steel roofs that they are significantly lighter. In an accident with a lateral impact on the body part 1, in particular in a so-called pole crash, a well-defined deformation behavior of the body part 1 is necessary. The areas on the side bars at the transition to the vehicle roof are of the greatest importance here. An enlargement of section A of body part 1 is shown in 1 (b) shown. The carbon structure 3 can be seen, which is glued to the support structure 4, which is designed here as a roof cross member. A recess 3' in the carbon structure 3 can also be seen. The recess 3' is approximately V-shaped in relation to the main extension plane of the carbon structure 3 and forms a structural weak point in the carbon structure 3. This structural weak point is the area of the carbon structure 3 which in the event of an accident occurring from the side as the second desired buckling point S2 buckles first. The second desired kink point S2 is shown as a dashed line.

1(c) shows the same section as 1 (b) . In contrast to the representation in 1 (b) here the carrier structure 4 is removed from the view, revealing the frame structure 2 . The frame structure 2 is riveted to the support structure 4 and, like the carbon structure 3, has a structural weak point. The structural weak point of the frame structure 2 is the first predetermined buckling point S1, which runs directly below the second predetermined buckling point S2. In the event of a pole crash, the first target buckling point S1 and the second target buckling point S2 work together and allow a well-defined deformation of the body component, so that energy can be dissipated and the passengers inside the motor vehicle are well protected.

1 (d) shows the same section as 1(c) . In contrast to the representation in 1(c) the view from below, ie from the vehicle interior, onto the frame structure 2 is shown here. The stability-promoting geometric structures 2', which are designed as a plurality of beads, can be seen. In the area of the first desired buckling point S1, the shape of the beads is significantly reduced, which leads to a weakening of the rigidity of the frame structure 2 in the area of the first desired buckling point S1.

2 FIG. 1 schematically illustrates a motor vehicle 100 according to an exemplary embodiment of the present invention. The motor vehicle 100 has a body part 1 according to an exemplary embodiment of the present invention with a carbon structure 3 designed as a carbon roof module. The location of the is shown in the 1(b)-(c) shown section A.

Reference List

1

body part

2

frame structure

2'

stability-enhancing geometric structure

3

carbon structure

3'

recess

4

support structure

100

motor vehicle

S1

first desired kink point

S2

second target kink point

A

cutout

Claims (10)

Body part (1), in particular a body part of a motor vehicle (100), the body part (1) having a frame structure (2), a carbon structure (3) and a support structure (4) arranged between the frame structure (2) and the carbon structure (3). , wherein the frame structure (2) has a first target kink point (S1), wherein the carbon structure (3) has a second target kink point (S2), characterized in that the first target kink point (S1) and the second target Kink point (S2) based on a main plane of extension of the carbon structure (3) are arranged directly one above the other. Body part (1) according to claim 1 , wherein the carbon structure (3) is a carbon roof module. Body part (1) according to one of the preceding claims, in which the frame structure (2) is a front roof frame. Body part (1) according to one of the preceding claims, wherein the second predetermined buckling point (S2) is a cutout (3') in the carbon structure (3), wherein the cutout (3') is preferably one in relation to the main plane of extension of the carbon structure (3 ) areal recess is (3'). Body part (1) according to claim 4 , wherein the recess (3') is U-shaped, V-shaped or I-shaped in relation to the main plane of extension of the carbon structure (3), the recess (3') orthogonal to the main plane of extension of the carbon structure (3) preferably being continuous. Body part (1) according to one of the preceding claims, wherein the first desired buckling point (S1) is formed by a reduced wall thickness of the frame structure (2) and/or wherein the first desired buckling point (S1) is formed by a reduced formation of one or more stability-promoting geometric structures (2 ') is formed. Body part (1) according to one of the preceding claims, wherein the frame structure (2) is riveted and/or welded and/or screwed to the support structure (4). Body part according to one of the preceding claims, wherein the carbon structure (3) is positively and/or non-positively and/or cohesively connected to the support structure (4), the carbon structure (3) preferably being clipped into the support structure (4) and/or with is screwed to the support structure (4) and/or glued to the support structure (4). Body part (1) according to one of the preceding claims, wherein the carrier structure (4) has a third desired buckling point, the third desired buckling point and the second desired buckling point (S2) being arranged directly one above the other in relation to a main extension plane of the carbon structure (3). are, wherein the third predetermined buckling point is preferably formed by a reduced wall thickness of the support structure (4) and/or wherein the third desired kink point is preferably formed by a reduced formation of one or more stability-promoting geometric structures. Motor vehicle (100) having a body part (1) according to one of the preceding claims.

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