Bumper Fascia Bracket With Controlled Deflection Structure
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Solution Overview
Problem
Vehicle bumper structures face challenges in effectively absorbing impact energy from both high-speed and low-speed collisions, particularly in managing forces applied to the bumper fascia, which requires a controlled deflection mechanism to absorb and distribute impact forces efficiently.
Innovation Solution
A bumper fascia support assembly with a bracket featuring a controlled deflection structure, comprising reinforcing webs with weakened sections that deform downward upon impact, allowing the fascia to move relative to the support attachment end and absorb energy, while the support attachment end is reinforced to resist bending and fracture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bracket is made rigid to maintain structural integrity, then strength is improved, but the ability to absorb impact energy through controlled deflection deteriorates
Solution Approach 1:
The bracket is segmented into distinct regions with different structural properties: a reinforced attachment end portion that maintains rigidity for structural integrity, and a deflection structure portion that is designed to bend and absorb energy. This segmentation allows each region to perform its specific function optimally without compromising the other.
Solution Approach 2:
Different portions of the bracket are given different local qualities - the attachment end has increased thickness and reinforcement for strength, while the deflection structure has reduced thickness and strategic cutouts to enable controlled bending. This local differentiation resolves the contradiction by making each region specialized for its required function.
2Loss of energy
If the bracket is designed to deflect downward to absorb impact energy, then impact energy absorption is improved, but structural integrity and resistance to bending deteriorate
Solution Approach 1:
The bracket is divided into a stable attachment end portion that remains rigid and a deflection structure portion that is designed to bend. This segmentation ensures that structural integrity is maintained at the attachment point while energy absorption occurs in the deflection region.
Solution Approach 2:
The deflection structure acts as an intermediary element between the rigid attachment end and the bumper fascia. It mediates the transfer of impact forces by controlled deformation, protecting the structural integrity of the attachment end while still providing energy absorption.
3Loss of energy
If the bracket has a controlled deflection structure with weakened sections, then impact energy absorption is improved, but manufacturing complexity increases
Solution Approach 1:
The deflection structure is segmented into specific zones with weakened sections positioned at predetermined locations. These segmented weakened zones create controlled bending paths that are relatively simple to manufacture using standard forming and cutting techniques.
Solution Approach 2:
The bracket design incorporates parameter changes in the form of varying thickness and strategic cutouts that create the desired deflection characteristics. These parameter changes are implemented through conventional manufacturing processes, balancing manufacturing simplicity with controlled deflection performance.
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 controlled deflection structure effectively absorbs impact energy by bending downward in a predetermined manner, enhancing the vehicle's ability to manage both high-speed and low-speed impact forces, thereby improving the structural integrity and safety of the bumper fascia during collisions.
Implementation Method 1
The body section of the bracket has a controlled deflection structure that is configured with respect to the support attachment end and the fascia attachment end to deform downwardly in response to a prescribed impacting force being applied to the bumper fascia so that the fascia attachment end and the central section of the bumper fascia move downward relative to the support attachment end absorbing impact energy
Data Source
AI summary
A bumper fascia support assembly includes a front support, a bracket and a bumper fascia. The bracket has a support attachment end, a body section and a fascia attachment end. The support attachment end is fixedly attached to a forward facing surface of the front support. The bumper fascia has a central section fixedly attached to the fascia attachment end of the bracket. The body section of the bracket has a controlled deflection structure that is configured with respect to the support attachment end and the fascia attachment end to deform downwardly in response to a prescribed impacting force being applied to the bumper fascia so that the fascia attachment end and the central section of the bumper fascia move downward relative to the support attachment end absorbing impact energy.