Multi-Chamber Bumper Cross Member with Asymmetric Profile
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Solution Overview
Problem
Existing bumper arrangements for motor vehicles face a trade-off between achieving good crash performance, minimizing weight, and requiring minimal installation space, with known solutions either being too heavy or prone to twisting during crashes.
Innovation Solution
A bumper arrangement featuring a lightweight metal cross member with a multi-chamber profile, where the front side is taller than the rear side, and crash boxes are strategically designed to absorb energy and prevent twisting, allowing for efficient energy absorption and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross member is made with large dimensions to increase stiffness and energy absorption capacity, then crash performance is improved, but own weight and installation space requirements increase
Solution Approach 1:
The cross member is divided into multiple chambers (front chamber and main chamber) separated by walls, creating a multi-chamber structure. This segmentation increases the moment of inertia and structural stiffness without requiring larger external dimensions, thereby improving crash performance while controlling weight
Solution Approach 2:
The front side of the cross member is designed with greater height than the rear side, creating asymmetric local geometry. The front chamber walls are strategically positioned to optimize energy absorption in the impact region while maintaining overall weight efficiency
2Strength
If the cross member is made with large dimensions to increase stiffness and energy absorption capacity, then crash performance is improved, but installation space requirements increase
Solution Approach 1:
The multi-chamber configuration with internal walls creates structural rigidity through increased moment of inertia, allowing the cross member to achieve high crash performance within compact external dimensions, thus reducing installation space requirements
Solution Approach 2:
The asymmetric design with greater front height utilizes the vertical dimension more effectively at the impact zone, optimizing crash performance in a space-efficient manner without requiring increased length or width
3Adaptability or versatility
If an asymmetric middle section is added to enable sufficient overlap in bumper-to-bumper crash, then overlap capability is improved, but twisting during impact increases
Solution Approach 1:
The cross member is divided into chambers with strategic wall placement that creates torsional rigidity. The segmentation provides internal structural support that resists twisting while allowing the asymmetric external geometry to achieve sufficient overlap capability
Solution Approach 2:
The asymmetric middle section design is combined with internal chamber segmentation, where the internal symmetric reinforcement counteracts the twisting tendency while the external asymmetric shape provides the necessary overlap capability for bumper-to-bumper crashes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves high crash performance with reduced weight and minimal space requirements, while preventing damage to surrounding components during crashes by effectively distributing impact forces.
Implementation Method 1
The crash boxes are configured so as to undergo deformation as a result of the impact and thus convert kinetic energy into deformation energy by cold deformation
Data Source
AI summary
A bumper arrangement for a motor vehicle includes a bumper arrangement for a motor vehicle, including a cross member made of a lightweight metal and constructed as multi-chamber section which has at least one front chamber and at least one main chamber, wherein the front chamber is arranged in front of the main chamber in longitudinal direction of the motor vehicle, wherein the main chamber has a greater cross sectional surface than the at least one front chamber, wherein the cross member has a front side facing in a driving direction of the motor vehicle and a rear side facing away from the driving direction, wherein the front side has a height in vertical direction of the motor vehicle, which is greater than a height of the rear side, wherein at least one wall of the at least one front chamber forms a portion of the front side; and crash boxes arranged in respective end regions of the cross member for coupling the bumper arrangement with the motor vehicle. The cross member can be formed as extruded part.