Automotive Bumper Reinforcement Lip Deformation Control
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Solution Overview
Problem
Conventional bumper reinforcements with closed cross sections differ in deformation mode during collisions compared to those with opened cross sections, necessitating a design that reduces stroke amount during collisions by strategically thickening sections.
Innovation Solution
An automotive bumper reinforcement with a hollow structure featuring a lip groove shape, where the ends of the upper and lower surface webs are thicker than the center, and the lips are designed to deform inwardly, reducing stroke amount and stress concentration during collisions, while allowing for increased energy absorption without extending side members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the bumper reinforcement has an opened cross section to allow side member insertion, then the side member can be extended and energy absorption can be increased, but the deformation mode during collision differs from closed cross section types, requiring different thickening strategies
Solution Approach 1:
The patent applies local quality by providing thickened sections at specific locations (ends of upper and lower surface webs) rather than uniformly throughout the structure. This localized thickening addresses the specific deformation modes of opened cross-section bumpers during collision, reinforcing areas where lips tend to deform inward while maintaining the overall opened cross-section design that allows side member insertion and energy absorption.
2Strength
If the end of surface web is thickened to suppress lip deformation, then the stroke amount during collision is reduced, but the structural complexity increases
Solution Approach 1:
The thickened section is provided only at the end of the surface web adjacent to the lip, not throughout the entire structure. This localized reinforcement suppresses lip deformation and reduces stroke amount during collision while minimizing the increase in overall structural complexity and material usage.
3Strength
If the thickened section is formed to be swelled outward, then the deformation of lips is more effectively suppressed, but the manufacturing complexity increases
Solution Approach 1:
The patent changes the geometric parameter of the surface web end by forming a thickened section with outward swelling. This parameter change effectively suppresses lip deformation during collision. The swelling is designed to be integrally formed with the surface web, which can be achieved through conventional forming processes, thus managing manufacturing complexity while achieving the desired structural reinforcement.
Data Source
AI summary
The bumper reinforcement has a front surface flange, an upper surface web, a lower surface web, an upper lip, and a lower lip. An end of the upper surface web on the upper lip side is thicker than a center. When a collision load is applied to the front surface flange, the upper surface web extending in a direction orthogonal to the front surface flange from vicinity of an upper end of the front surface flange is deformed in an outward opened direction, and the upper lip extending downward from an extension end of the upper surface web is deformed in an inward closed direction.