Bumper Reinforcement Joined Part Break-off Prevention
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Solution Overview
Problem
Conventional bumper reinforcements face challenges in achieving both anti-collision performance and lightweightness, as increased material strength leads to break-off at joined parts due to localized weakening of welds and increased collision loads, which reduces energy absorption efficiency.
Innovation Solution
The design incorporates a first member with a flat sheet and upstanding parts, and a second member with a top plate, vertical walls, and upstanding parts, which are joined to enhance the rigidity of both members, reducing out-of-plane deformation and the likelihood of break-off during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the material strength of the BR is increased to improve anti-collision performance, then the strength of the BR increases, but the strength of the joined part by welding decreases locally due to additive elements
Solution Approach 1:
The patent applies local quality by providing reinforcement plates at specific locations where strength is needed (joined parts and upstanding parts) rather than uniformly increasing the material strength throughout the entire BR. This allows the base material to maintain lower strength (avoiding weld degradation from additive elements) while critical areas receive localized strengthening through the reinforcement plates.
2Strength
If the material strength of the BR is increased to improve anti-collision performance, then the strength of the BR increases, but the load on the joined part increases due to constant deformation
Solution Approach 1:
The reinforcement plates are installed in advance at critical locations (joined parts and upstanding parts) before collision occurs. This preliminary strengthening prepares the structure to handle the increased loads that will result from higher material strength, distributing the collision forces more effectively and preventing concentrated stress at the joined parts.
3Use of energy by moving object
If the shape of the panel is contrived to improve energy absorption efficiency, then the energy absorption performance improves, but the structural complexity increases
Solution Approach 1:
The patent segments the BR into distinct functional components: the base panel structure for overall energy absorption, and separate reinforcement plates for localized strengthening. This segmentation allows the panel shape to be optimized for energy absorption while the reinforcement plates are added only where structurally necessary, avoiding unnecessary complexity in non-critical areas.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A bumper reinforcement (10) includes a first member (1), and a second member (2). The first member (1) includes a flat plate part (11), and two first upstanding parts (12). The first upstanding parts (12) are respectively connected to two side edges of the flat plate part (11). The second member (2) includes a top plate part (24), two vertical wall parts (22), two flange parts (21), and two second upstanding parts (23). The vertical wall parts (22) are respectively connected to two side edges of the top plate part (24). The flange parts (21) are respectively connected to the two vertical wall parts (22). The second upstanding parts (23) are respectively connected to side edges of the two flange parts (21), and are provided so as to correspond to the first upstanding parts (23). The two flange parts (21) of the second member (2) are joined with the flat plate part (11) of the first member (1). The first upstanding parts (23) stand up toward the second member (2) side.