Vehicle Load Absorbing Member with Extending Portions
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Solution Overview
Problem
Existing load absorbing members in vehicle collisions face issues with peeling at bonded portions due to excessive loads, leading to instability in deformation and potential failure during impact.
Innovation Solution
A load absorbing member with a closed cross-sectional shape made of fiber reinforced resin, featuring bonded portions and extending portions that act as rotation moments to bring bonded portions into tight contact, and reinforcing portions to enhance rigidity, preventing peeling and stabilizing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If body portions are bonded together to form a closed cross-sectional shape, then load absorption capability is improved, but peeling at bonded portions occurs under excessive load
Solution Approach 1:
The load absorbing member is divided into multiple body portions (first body portion and second body portion) that are bonded together to form a closed cross-sectional shape. This segmentation allows each body portion to independently deform and absorb energy while maintaining overall structural integrity through the bonded portions.
Solution Approach 2:
Extending portions are added to the body portions to act as preliminary cushioning elements. These extending portions deform first under load, generating rotation moments that prevent peeling at the bonded portions before the bonded portions themselves are subjected to excessive stress.
2Loss of energy
If body portions deform to crush under load, then energy absorption is improved, but bonded portions may peel off due to excessive deformation
Solution Approach 1:
The extending portions serve as preliminary cushioning elements that deform first under compressive load. This controlled initial deformation generates rotation moments that act to press the bonded portions together, preventing peeling even as the body portions undergo significant crushing deformation for energy absorption.
Solution Approach 2:
The rotation moments generated by the extending portions during deformation are converted from potential harmful peeling forces into beneficial pressing forces. Instead of allowing the deformation to cause bonded portion separation, the extending portions utilize the deformation to create moments that actively press the bonded portions together, maintaining integrity during energy absorption.
3Reliability
If extending portions are added to prevent peeling, then bonded portion integrity is improved, but device complexity increases
Solution Approach 1:
The extending portions are merged with the body portions as integral components of the same load absorbing member. This merging approach allows the extending portions to be formed from the same fiber reinforced resin material and bonded together with the body portions using the same bonding process, avoiding the need for separate components or additional assembly steps.
Solution Approach 2:
The extending portions serve multiple functions: they act as preliminary cushioning elements, generate rotation moments to prevent peeling, and maintain bonded portion integrity during deformation. This multi-functionality allows a single structural feature to address multiple problems without requiring additional separate components.
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 solution effectively suppresses peeling of bonded portions and stabilizes deformation during vehicle collisions by utilizing rotation moments and reinforcing structures, ensuring efficient load absorption and distribution.
Implementation Method 1
the body portions are deformed to crush in the penetrating direction by the load to absorb at least a part of the load
Implementation Method 2
the body portions are configured to deform to crush in the penetrating direction by a load acting in the penetrating direction to absorb at least a part of the load
Implementation Method 3
the extending portion functions as an arm for a rotation moment based on the load. The rotation moment acts to move the bonded portions of the first body portion toward the bonded portions of the second body portion
Data Source
AI summary
In a crash box, a first extending portion extends from a front end of a first body upper portion in a vehicle front-rear direction of a first body portion, and a second extending portion extends from a front end of a second body lower portion in a vehicle front-rear direction of a second body portion. When an impact load is transmitted to the front ends of the first body portion and the second body portion in the vehicle front-rear direction, a rotation moment toward the lower side of the vehicle acts on the first extending portion and a rotation moment toward the upper side of the vehicle acts on the second extending portion. This can suppress peeling between first and second left side bonded portions and between first and second right side bonded portions of the first body portion and the second body portion.