Vehicle Bonnet Lining with Recessed Intermediate Wall
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Solution Overview
Problem
Existing vehicle bonnet designs fail to effectively absorb shock impacts from pedestrians or cyclists, leading to inadequate trauma reduction due to uniform material properties and lack of controlled deformation mechanisms.
Innovation Solution
A bonnet liner design featuring a first wall that hugs the bonnet skin, a second offset wall connected by an intermediate wall with strategically placed recesses that extend to both walls, allowing controlled deformation and enhanced shock absorption by prioritizing intermediate wall deformation during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bonnet lining is made of uniform material throughout, then the manufacturing process is simple, but the shock absorption capability is insufficient during pedestrian or cyclist impacts
Solution Approach 1:
The bonnet lining features an intermediate wall with recesses that create localized deformation zones. These recesses are positioned to concentrate deformation in specific areas during impact, allowing the structure to absorb energy more effectively while maintaining overall structural integrity. This local modification of geometry enables controlled deformation patterns that reduce impact forces on pedestrians or cyclists.
2Object-affected harmful factors
If the bonnet lining structure is made more complex with additional deformation control features, then the shock absorption is improved, but the manufacturing complexity increases
Solution Approach 1:
The bonnet lining is divided into distinct functional zones: a first wall for structural support, an intermediate wall with recesses for energy absorption, and a second wall for additional deformation control. This segmentation allows each zone to perform its specific function optimally while maintaining a relatively simple overall manufacturing process through stamping or forming operations.
3Stability of the object's composition
If the intermediate wall is made more rigid to support the skin, then the structural stability is improved, but the deformation control during impact is reduced
Solution Approach 1:
The intermediate wall is pre-formed with recesses during manufacturing that anticipate the deformation needed during impact. These pre-formed geometric features guide the deformation pattern when impact occurs, ensuring that the wall deforms in a controlled manner to absorb energy while maintaining sufficient rigidity to support the bonnet skin under normal conditions.
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 improved shock absorption and reduced deceleration forces during impacts by finely controlling the bonnet's deformation, balancing rigidity and flexibility to protect pedestrians or cyclists effectively.
Implementation Method 1
the intermediate wall which is inclined relative to the other two... at least one recess is made through the intermediate wall... The intermediate wall is preferentially deformed during the impact
Implementation Method 2
The presence of this or these recesses makes it possible to finely control the deformation of the hood lining and consequently the deformation of the hood under the effect of an impact... to limit the trauma suffered by this person
Data Source
Figure 1~2
Figure 3~4
AI summary
The bonnet has a skin integrated on an inner panel (10), where the panel has a wall (14) that is offset from a wall (12) and connected to the wall (12) by an intermediate wall (16). The intermediate wall extends outside an opening (18) that traverses the wall (12). Recesses (20) are formed across the intermediate wall in extension of a bar. The recesses are extended to reach the walls (12, 14), where each recess has a rectangular or trapezoid section.