Body and motor vehicle with such

Abstract

Body (10), with the following features: - a crossbeam (11) running perpendicular to a planned direction of travel (16), - a longitudinal beam (13) extending lengthwise to the direction of travel (16) with at least one inner belt and one outer belt and - an asymmetrically shaped crash box (14) arranged between the cross member (11) and the longitudinal member (13) such that a force acting against the direction of travel (16) on the cross member (11) is directed asymmetrically into the belts, characterized by the following features: - the crash box (14) has an inside and an outside in the width direction of the vehicle, - one side is shorter than the other side, so the force is initially directed to the other side, and - the longitudinal beam (13) and the crash box (14) are aligned coaxially, so that the force is first directed via one side of the crash box (14) into the corresponding belt of the longitudinal beam (13).

Description

[0001] The present invention relates to a body according to the preamble of claim 1. The present invention further relates to a corresponding motor vehicle. State of the art

[0002] In the self-supporting body typically used for passenger cars and vans, the supporting structure for the engine and chassis forms a single unit with the vehicle body. The beams used according to the state of the art are typically assembled from at least two shells made of deep-drawn sheet metal. In the design of beam cross-sections, node structures between the beams, and various sheet metal panels, both the geometric and mechanical-structural requirements of the body are taken into account. For modern vehicles, crash performance is of particular importance.

[0003] In the field of vehicle safety, so-called crash boxes are well known in this context. Within these boxes, in the event of a rear-end collision, kinetic energy can be dissipated by deformation of suitable materials in order to expose the vehicle occupants and the entire body to a lower deceleration force, thus preventing impermissible deformations of the vehicle structure and injuries to the passengers.

[0004] The generic DE 196 35 285 A1 discloses the subject matter of the preamble of claim 1.

[0005] DE 101 26 065 C2 discloses a deformation element between a longitudinal beam and a cross member of a motor vehicle, the cross member being vertically offset with respect to its horizontal central longitudinal plane relative to the horizontal central longitudinal plane of the longitudinal beam. The central component of such a deformation element is a polygonal, elongated hollow base body with a greater height than width. Depending on the specific vehicle type, at least one U-shaped stiffening shell is strategically assigned to this base body in such a way that the bending moments arising from the offset of the horizontal central longitudinal planes of the cross member and longitudinal beam in the vertical central longitudinal plane are optimally absorbed. For this purpose, the stiffening shell overlaps the base body with the longitudinal edges of its legs.The base body and the stiffening shell are joined by welding, whereby spot welding or short longitudinal seams should suffice for a reliable connection. Specifically, the longitudinal edges on the outside of the base body's side walls are welded.

[0006] DE 101 28 114 A1 discloses an impact damper for motor vehicles for absorbing energy in a collision of the motor vehicle with an obstacle, comprising a cylindrical hollow body made of metal, defining a longitudinal direction of the impact damper and having deformation ribs in the shell to achieve a defined compression of the hollow body when subjected to a force in the longitudinal direction, comprising a substantially transversely oriented first mounting surface at one end of the hollow body for attachment to a vehicle longitudinal member or another structural component of the motor vehicle body, and a second mounting surface at the opposite, second end of the hollow body for attachment to a mating surface of a bumper cross member or another structural component of the motor vehicle body, wherein the hollow body is substantially closed at the second end and the second mounting surface provides a mounting for the bumper cross member or the like.with a counter surface running at an acute angle to the first mounting surface.

[0007] WO 97 / 03 865 A1 discloses an energy-absorbing vehicle bumper assembly comprising a pair of longitudinally extending deformation elements inserted between a front body structure and a bumper reinforcement. The deformation elements consist of a deformation tube section and a receiving support section, the deformation tube section extending into a cavity of the bumper reinforcement.

[0008] From EP 2 401 190 B1 a vehicle structure is known in which frame elements are provided in the front area in the longitudinal direction and a front connection and a rear connection to the vehicle structure in the lateral direction are objected to from each other.

[0009] EP 2 112 981 B1 describes a section of a longitudinal beam which has a defined kink and connection points that are offset from each other in a vertical direction when viewed from the side.

[0010] From EP 1 631 752 B1 a deformation structure in the front area of ​​a vehicle is known, wherein a compression of the deformation structure as a result of a force acting in the longitudinal direction and a pivoting in a transverse axis is initiated.

[0011] Finally, DE 103 09 626 A1 describes a body support with corrugations which are bent in a preferred spatial direction when compressed. Disclosure of the invention

[0012] The invention is based on the objective of designing a support kinematics such that, as a result of the force being applied to the longitudinal support, its outer flange buckles.

[0013] The problem is solved by the features of claims 1 and 4.

[0014] The invention provides a body and a corresponding motor vehicle according to the independent claims.

[0015] One advantage of this solution lies in the design of the beam kinematics such that, as a result of the force being applied to the longitudinal beam, any residual block is deposited laterally. This allows for controlled buckling of the longitudinal beam by applying a targeted (higher) load to the outer or inner wall. A later application of the load on one side favors earlier load application to the outer flange of the longitudinal beam, resulting in its buckling. An asymmetrically shaped crash box is used for this purpose. In this context, the term "crash box" is used broadly to refer to any component within which, in the event of a rear-end collision, kinetic energy can be dissipated through the deformation of suitable materials. This reduces the deceleration force experienced by the vehicle occupants and the entire body, thus preventing unacceptable deformation of the vehicle structure and injuries to the passengers. Brief description of the drawings

[0016] An embodiment of the invention is shown in the drawings and is described in more detail below. Fig. Figure 1 shows the longitudinal section of a car body according to the invention in the first phase of its impact on an obstacle. Fig. Figure 2 shows the longitudinal section in a second phase of the impact. Fig. Figure 3 shows the longitudinal section in a third phase of the impact. Embodiments of the invention

[0017] The figures, taken together, illustrate the progressive plastic deformation of the body (10) of a motor vehicle – not shown in its entirety – during an offset frontal impact with a substantially rigid obstacle. Particular attention is paid to a longitudinal member (13) located in front of the front wheel (15) on the left side of the vehicle in the direction of travel (16).

[0018] Fig. Figure 1 shows the body (10) at its initial contact with the obstacle, which is located on the left side (16) at the level of the front wheel (15) in the direction of travel. At this stage, the obstacle reaches a crossmember (11) located near the front bumper, which will be referred to as the "bumper crossmember" in the following. This bumper crossmember (11) is mechanically connected to the front end section (12) of the longitudinal member (13) via an asymmetrically shaped crash box (14).

[0019] Fig. Figure 2 shows the body (10) in a phase of progressive plastic deformation. The crash box (14) has already dissipated some of the vehicle's kinetic energy, with the force exerted by the obstacle against the direction of travel (16) being primarily directed into the lower outer surface of the crash box (14), as shown in the illustration, which has buckled as a result of its mechanical load. The outer belt or flange of the longitudinal member (13), extending from the outer surface, was also subjected to the force introduced via the crash box (14), so that an incipient deformation is also visible here.

[0020] Fig.Figure 3 finally illustrates the final state of the body (10) after the crash box (14) has been essentially completely compressed by the force of the impact and the bumper crossmember (11) is thus in almost full contact with the end piece (12). In this state, the longitudinal member (13) is noticeably bent towards the outside of the body (10) – thus downwards, as shown in the illustration – because the deformation of its outer belt is significantly greater than that of its inner belt.

Claims

[1] Body (10), with the following features: - a crossbeam (11) running perpendicular to a planned direction of travel (16), - a longitudinal beam (13) extending lengthwise to the direction of travel (16) with at least one inner belt and one outer belt and - an asymmetrically shaped crash box (14) arranged between the cross member (11) and the longitudinal member (13) such that a force acting against the direction of travel (16) on the cross member (11) is directed asymmetrically into the belts, characterized by the following characteristics: - the crash box (14) has an inside and an outside in the width direction of the vehicle, - one side is shorter than the other side, so the force is initially directed to the other side, and - the longitudinal beam (13) and the crash box (14) are aligned coaxially, so that the force is first directed via one side of the crash box (14) into the corresponding belt of the longitudinal beam (13). [2] Body (10) according to claim 1, characterized by the following characteristics: - the body (10) further comprises a finishing part (12) arranged between the cross member (11) and the longitudinal member (13) and - the end part (12) rests on the crash box (14) on one side and on the longitudinal member (13) on the other. [3] Body (10) according to one of claims 1 or 2, characterized by the following characteristic: - the cross member (11) is a bumper cross member (11). [4] Motor vehicle with a body (10) according to any one of claims 1 to 3.

Images