Vehicle Bumper Reinforcement Ridge Lines for Impact Stress Distribution
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Solution Overview
Problem
Existing bumper devices for vehicles face stress concentration and rupture issues at working holes during angled collisions, leading to inadequate energy absorption and increased repair costs.
Innovation Solution
A bumper reinforcement with at least four ridge lines extending along the width direction of the vehicle at the impact surface, providing a stepped thickness profile to distribute load and reduce stress concentration, thereby preventing rupture and enhancing energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the section stiffness is increased to withstand higher impact forces, then the bumper reinforcement can absorb more energy, but stress concentration occurs at the working hole during angled collisions, leading to rupture
Solution Approach 1:
The patent applies local quality by creating ridge lines at specific locations around the working hole to concentrate reinforcement exactly where stress occurs during angled collisions. These ridge lines are positioned at the corners and edges of the hole, providing localized strengthening without increasing the overall section stiffness uniformly throughout the bumper reinforcement.
Solution Approach 2:
The bumper reinforcement is segmented into multiple regions by the ridge lines that divide the area around the working hole into distinct zones. This segmentation allows stress to be distributed across multiple pathways rather than concentrating at a single point, preventing rupture while maintaining the necessary overall strength.
2Ease of manufacture
If a working hole is formed at the impact surface for mounting purposes, then the bumper reinforcement can be mounted to the impact absorber, but stress concentration occurs in the vicinity of the hole during angled collisions
Solution Approach 1:
The ridge lines are strategically positioned at the corners and edges of the working hole to provide localized stress distribution. This local reinforcement allows the hole to maintain its mounting functionality while preventing stress concentration from propagating through the surrounding material during angled collisions.
3Ease of manufacture
If the bumper reinforcement ruptures at the working hole, then mounting is achieved, but energy absorption capability is insufficient and repair costs increase
Solution Approach 1:
The ridge lines create multiple stress distribution pathways around the working hole, segmenting the load-bearing paths. This ensures that during angled collisions, stress is distributed across multiple routes rather than concentrating at the hole, preventing rupture and maintaining the bumper's energy absorption capability throughout the collision event.
Data Source
AI summary
A bumper device for a vehicle includes a bumper reinforcement provided along a width direction of the vehicle. The bumper reinforcement is formed with a hole at an impact surface thereof and is provided with at least four ridge lines extending along the width direction of the vehicle at a side of the impact surface.