Vehicle Bonnet Orifice for Controlled Impact Deformation
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Solution Overview
Problem
Motor vehicle front bonnets face challenges in absorbing impact energy, particularly during 'hip impact' scenarios, where the existing stiff design fails to effectively distribute forces, leading to potential pedestrian injuries.
Innovation Solution
Incorporating a central boss with a transversely oriented, substantially rectangular orifice at the front edge of the bonnet's inner wall, which allows controlled deformation and shearing during impacts, optimizing the bonnet's deformation to manage force distribution and maintain stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the front edge of the bonnet is designed to be stiff to maintain structural integrity, then the bonnet can withstand normal operational stresses, but it fails to effectively absorb impact energy during hip impact scenarios
Solution Approach 1:
The patent applies local quality by creating a specific weak zone at the front edge of the bonnet through a rectangular orifice in the lining. This localized modification allows the front edge to deform preferentially during impact, absorbing energy while the rest of the bonnet maintains its structural integrity and strength.
2Stability of the object's composition
If the bonnet lining is made stiff to meet dimensional constraints, then geometric strength is improved, but the ability to control deformation during impact is reduced
Solution Approach 1:
The patent segments the bonnet structure by introducing a rectangular orifice in the lining at the front edge. This segmentation creates a controlled weak zone that can deform independently, allowing the bonnet to adapt its deformation characteristics during impact while maintaining the overall geometric strength of the undamaged portions.
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 enables the bonnet to absorb impact forces effectively, reducing the risk of pedestrian injuries while maintaining structural integrity and compliance with safety standards, by precisely controlling deformation and distributing stress across the front zone.
Implementation Method 1
Such an orifice arranged at this precise location of the cowl thus makes it possible to promote shearing of the orifice during the deformation of the cowl following an impact, which makes it possible to optimize the deformation of the cowl.
Data Source
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AI summary
The front bonnet (10) of a motor vehicle according to the invention comprises a first inner wall (11) and a second outer wall connected to each other and means for connection to the vehicle body, said inner wall (11) comprising at least one first substantially rectangular hole (18), said first hole (18): ? - is oriented transversely relative to a longitudinal axis (X) of the vehicle, ? - is arranged at a front edge (15; 22) of said inner wall (11; 19). The bonnet is characterised in that said inner wall (11) comprises a central boss (17) at said front edge (15), shaped to fit to the constraints of the front face of the vehicle imposed by the presence of an impression for the logo of the make of the vehicle, and in that said first hole (18) is made in said boss (17) and comprises predefined dimensions (L3, L4), so as to control the force of deformation of the bonnet (10) in case of an impact at said front edge (15).