Vehicle Bumper Panel with Cavity for Impact Energy Absorption
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Solution Overview
Problem
Existing protective covering devices for vehicle front or rear walls are ineffective in mitigating accident-related impacts without causing damage to the attached wall area, as they often absorb no energy during deformation and are destroyed in accidents, failing to absorb significant impact energy.
Innovation Solution
A frame-shaped panel element with a cavity is designed to be elastically or plastically deformed, featuring a lower inherent rigidity than the tailgate or bonnet, with targeted weakening points and a distance from the impact area to absorb and divert forces, preventing damage to the vehicle's wall area by distributing impact energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover element is made with high strength and rigidity to protect the wall area, then the wall area is protected from damage, but the cover element cannot absorb impact energy and is destroyed in accidents
Solution Approach 1:
The cover element is divided into multiple cavities within its structure, creating segmented compartments that allow controlled deformation. This segmentation enables the element to absorb impact energy through progressive cavity collapse while maintaining overall structural integrity and protecting the wall area.
Solution Approach 2:
The cover element's rigidity is varied spatially through the frame-shaped cross-section design, with different regions having different stiffness characteristics. The frame structure provides higher rigidity at critical attachment points while allowing softer, more compliant regions to deform and absorb energy during impact.
2Loss of energy
If the cover element is made with low rigidity to absorb impact energy, then impact energy is absorbed, but the cover element cannot protect the wall area effectively
Solution Approach 1:
Different regions of the cover element have different mechanical properties - the frame-shaped cross-section creates localized rigid zones at the perimeter and attachment areas, while the enclosed cavities provide compliant, energy-absorbing regions in the center. This local quality differentiation allows simultaneous energy absorption and structural protection.
Solution Approach 2:
The cover element combines rigid frame structures with compliant cavity spaces, creating a composite structure that exhibits both strength and energy absorption characteristics. The frame provides structural integrity and attachment strength, while the cavity enclosures provide controlled deformation and energy dissipation.
3Strength
If the cover element is attached directly to the wall area to provide protection, then the wall area is protected, but the cover element transmits full impact force to the wall area
Solution Approach 1:
The cover element is designed with built-in energy absorption capacity through its cavity structure, providing cushioning before impact forces reach the wall area. The cavities deform in a controlled manner during impact, dissipating energy and reducing the peak forces transmitted to the attached wall structure.
Solution Approach 2:
The cover element acts as an intermediary between the external impactor and the wall area, absorbing and redistributing impact forces through its cavity structure. This intermediary function prevents direct force transmission to the wall area while maintaining protective attachment.
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 solution effectively mitigates accident-related impacts by allowing the panel element to deform and absorb energy, protecting the vehicle's wall area from damage while maintaining structural integrity during normal operation.
Implementation Method 1
the panel element can be elastically and/or plastically deformed
Implementation Method 2
the panel element can be elastically and/or plastically deformed
Data Source
Figure 1
Figure 2
AI summary
The device (1) has an outer lining unit (5) horizontally arranged over a bumper (6) and connected with a front or rear wall area (3) of a motor vehicle. The outer lining unit exhibits a frame-shaped cross section about a horizontal area in a vertical vehicle longitudinal section, where the frame-shaped cross section encloses a hollow space (8). The lining unit exhibits an approximately vertical fastening wall (10) in its vertical middle to lower areas, where the fastening wall is connected with the wall area of the vehicle.