Offset Crash Box With Dividing Wall For Load Compensation
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Solution Overview
Problem
Existing crash boxes are unable to effectively compensate for inhomogeneous load introductions during a crash, particularly when there is a height offset of the crossmember, leading to rotation of the crossmember about its longitudinal axis and potential overloading of the vehicle's longitudinal carrier.
Innovation Solution
A crash box design featuring three hollow chambers, where one chamber is offset in height and separated by a continuous dividing wall from the other two, ensuring homogeneous deformation and minimizing crossmember rotation through targeted energy absorption and load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a crash box has multiple hollow chambers arranged at the same height, then energy absorption is improved, but the structure cannot compensate for inhomogeneous load introduction from height-offset crossmembers
Solution Approach 1:
The crash box is segmented into three hollow chambers arranged at different heights (first, second, and third chambers), allowing each chamber to independently absorb energy from load inputs at different heights. This segmentation enables the structure to handle inhomogeneous load introduction while maintaining effective energy absorption.
Solution Approach 2:
The invention transitions from a two-dimensional arrangement (chambers at the same height) to a three-dimensional arrangement (chambers at different heights along the vertical axis). This dimensional change allows the crash box to accommodate crossmembers with height offsets and distribute load inputs from multiple vertical positions.
2Device complexity
If a crossmember is barely curved or not curved, then structural simplicity is maintained, but the crossmember cannot contribute to load dissipation and causes rotation during crash
Solution Approach 1:
The crash box is divided into three separate hollow chambers arranged at different heights, allowing independent deformation and energy absorption in each chamber. This segmentation enables effective load dissipation even when the crossmember itself has minimal curvature, as the multi-level chamber structure provides the necessary deformation pathways.
3Stability of the object's composition
If hollow chambers are arranged to minimize inhomogeneous load introduction, then crossmember rotation is reduced, but the structure cannot handle height-offset bumper barrier constellations
Solution Approach 1:
The invention arranges hollow chambers at different vertical heights (first chamber at one height, second and third chambers at different heights), adding vertical dimensionality to the load distribution strategy. This enables the crash box to handle height-offset bumper barrier constellations while maintaining homogeneous load introduction to the longitudinal carrier.
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
The design achieves homogeneous crease formation and prevents excessive rotation of the crossmember during a crash, effectively converting crash energy into deformation energy without overloading the vehicle's longitudinal carrier, thus enhancing safety and structural integrity.
Implementation Method 1
the crash boxes serve to compensate for the energy which is input into the vehicle in the case of an impact, by said energy being converted for the great part into deformation energy during the deformation of the crash boxes
Data Source
AI summary
The invention relates to a crash box having a plurality of hollow chambers which extend over the longitudinal extent of the crash box, a first hollow chamber being arranged offset in terms of height with respect to a second hollow chamber and a third hollow chamber in the mounted position. Here, the first hollow chamber is separated by means of a dividing wall from the second and third hollow chambers which are preferably arranged next to one another above or below the first hollow chamber.