Polymer Rail Extensions for Vehicle Bumper Energy Absorption
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Solution Overview
Problem
Current energy absorbing bumper systems for vehicles are costly, heavy, and fail to maintain a consistent force during impact, leading to potential damage and increased repair costs, necessitating the development of lightweight, high-performance solutions that can absorb impact energy effectively in low-speed collisions.
Innovation Solution
The use of polymer-based energy absorbing rail extensions with alveolar structures and open channels, featuring cell walls and beveled surfaces to manage force distribution and absorption, ensuring consistent force exertion and complete crushing without exceeding the rail's force limit, thereby reducing vehicle damage and enhancing safety ratings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal energy absorbing systems are used, then strength and impact resistance are improved, but weight and cost increase
Solution Approach 1:
The patent changes the material parameter from traditional metal to polymer foam, fundamentally altering the density and strength-to-weight ratio of the energy absorbing system while maintaining protective functionality through controlled deformation characteristics
Solution Approach 2:
The invention uses polymer foam as a composite material that combines lightweight properties with energy absorption capabilities, creating a bumper system that is both lighter and cost-effective while meeting safety requirements
2Reliability
If energy absorber design is optimized for different components, then impact criteria satisfaction is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent creates a universal energy absorber design that can be applied across different bumper components and vehicle platforms, satisfying various impact criteria through a single standardized polymer foam-based solution rather than requiring component-specific designs
Solution Approach 2:
The energy absorber is divided into multiple cells with different densities arranged in zones, allowing a single modular design to satisfy different impact criteria for various components while maintaining manufacturing simplicity
3Object-generated harmful factors
If force peak during crushing is reduced, then vehicle damage is reduced, but energy absorption efficiency decreases
Solution Approach 1:
The patent applies local quality by creating zones of different foam densities within the energy absorber, where higher density zones control force peaks to protect the vehicle while lower density zones maximize energy absorption, achieving both goals simultaneously
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 polymer-based rail extensions effectively absorb impact energy, maintaining a consistent force within a narrow range, preventing excessive stress on vehicle rails and ensuring complete crushing without exceeding the force limit, thus reducing damage and enhancing safety ratings while being lightweight and cost-effective.
Implementation Method 1
the energy absorber comprises cells formed by cell walls extending a length of the energy absorber and forming cavities therethrough
Implementation Method 2
ensuring complete crushing without exceeding the force limit
Data Source
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AI summary
In one embodiment, a rail extension (4) comprises: an energy absorber comprising a polymer body, and vehicle attachment tabs (12) extending from one end of the energy absorber and configured to attach to a vehicle rail (6), and an attachment tab extending from another end of the energy absorber and configured to attach to a bumper beam (2). The energy absorber comprises cells (14) formed by cell walls extending a length of the energy absorber and forming cavities therethrough; and open channels (16) formed on each side of the energy absorber, wherein the channels are defined by walls of adjacent cells. A vehicle can comprise: a bumper beam (2); a vehicle rail (6); and the rail extensions (4).