C-Shaped Fixing Lug for Bumper Panel Impact Protection
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Solution Overview
Problem
During low-speed vehicle impacts, the existing bumper attachment system causes significant plastic deformation of both the bumper and the panel, leading to reduced absorption capacity and increased repair costs, as the deformation is reflected on the fixing lugs, necessitating bumper replacement and panel straightening.
Innovation Solution
The proposed solution involves a C-shaped fixing lug design with upper and lower arms connected by a loop, which stores energy during deformation, reducing the forces exerted on the panel and minimizing plastic deformation, allowing the lugs to deform elastically, plastically, or break to protect the panel, thereby reducing repair costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional fixing bracket is used to attach the bumper to the panel, then the bumper can be securely fixed to the panel, but significant plastic deformation occurs in both the bumper and the panel during low-speed impact, leading to increased repair costs
Solution Approach 1:
The fixing bracket is divided into three functional segments: an upper arm for attachment to the panel, a lower arm for attachment to the bumper, and a C-shaped energy-absorbing portion connecting them. This segmentation allows each part to perform its specific function - the upper and lower arms provide structural support and attachment, while the C-shaped portion absorbs impact energy through elastic and plastic deformation, preventing force transmission to the panel.
Solution Approach 2:
The C-shaped energy-absorbing portion is designed in advance to deform during impact, absorbing energy before it can be transmitted to the panel. This beforehand cushioning mechanism prevents the harmful effect of plastic deformation in the panel by pre-positioning an energy-absorbing element in the force transmission path.
2Object-affected harmful factors
If the fixing bracket is made more rigid to prevent panel deformation, then panel plastic deformation is reduced, but the bumper's impact absorption capacity is reduced and repair costs increase
Solution Approach 1:
Different parts of the fixing bracket have different mechanical properties tailored to their specific functions. The upper and lower arms are designed with sufficient rigidity to maintain structural integrity and attachment strength, while the C-shaped energy-absorbing portion is designed with controlled rigidity to deform elastically and plastically during impact. This local differentiation of mechanical properties allows the system to simultaneously protect the panel and maintain impact absorption capacity.
Solution Approach 2:
The C-shaped portion's geometric parameters (curvature radius, thickness, length) are optimized to control its deformation characteristics. By adjusting these parameters, the energy-absorbing portion can be tuned to deform in a controlled manner during impact, absorbing energy through elastic and plastic deformation while preventing excessive force transmission to the panel.
3Ease of manufacture
If the fixing bracket design is simplified to reduce manufacturing complexity, then manufacturing cost decreases, but the energy absorption capability and protection of the panel are compromised
Solution Approach 1:
The fixing bracket integrates multiple functions into a single component: attachment to the panel (upper arm), attachment to the bumper (lower arm), and energy absorption (C-shaped portion). This merging of functions into one piece reduces the number of parts and assembly steps, simplifying manufacturing while maintaining comprehensive protection capabilities.
Solution Approach 2:
The fixing bracket serves multiple purposes simultaneously: it provides structural support for mounting the bumper, absorbs impact energy through deformation, and protects the panel from plastic deformation. This multi-functionality is achieved within a single component design that can be manufactured using standard processes.
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
This design significantly reduces plastic deformation of the panel and bumper, lowering repair costs and potentially improving fuel efficiency and reducing emissions by integrating energy-absorbing elements, especially when made from plastic materials.
Implementation Method 1
the C-shaped portion which extends in a plane PO parallel to the primary face... stores energy during deformation
Implementation Method 2
allowing the lugs to deform elastically, plastically, or break to protect the panel
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Assembly (5) comprising: a panel (6) having a primary face (10) and a secondary face (11) which are opposite one another; a bumper (7) fixed to the panel (6) by means of a fixing lug (12), the bumper (7) extending facing the secondary face (11), the fixing lug (12) having an extreme upper part (13) by means of which the fixing lug (12) is fixed to the primary face (10) and an extreme lower part (14) by means of which the fixing lug (12) is secured to the bumper (7); the fixing lug (12) comprising, between the extreme lower part (14) and the extreme upper part (13), a C-shaped portion (15) which extends in a plane PO parallel to the primary face (10).