Offset Collision Load Transmission via Side Frame Contact
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Solution Overview
Problem
In vehicle collisions, especially offset collisions, the high rigidity of bumper reinforcements can lead to inadequate load transmission due to deformation of the side frame, resulting in inefficient collision load distribution.
Innovation Solution
A vehicle body structure featuring a side frame with a load transmission member on a lower member that contacts the side frame's outer surface during an offset collision, allowing for stable collision load transmission across the vehicle width direction, utilizing a combination of corrugated plate structures, cross members, and load transmission members to absorb and distribute impact loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bumper reinforcement with high rigidity is used, then the structural strength is improved, but the side frame deforms during offset collision causing inadequate load transmission
Solution Approach 1:
The bumper reinforcement is divided into a first reinforcement member and a second reinforcement member positioned at different locations. This segmentation allows each member to independently engage with the side frame, ensuring that load transmission remains reliable even if one engagement point deforms during collision.
Solution Approach 2:
Different portions of the bumper reinforcement structure are designed with different properties - the first and second reinforcement members have specific configurations optimized for their respective engagement positions with the side frame, allowing localized adaptation to deformation patterns.
2Loss of energy
If the bumper reinforcement bends during offset collision, then the collision load is absorbed, but the load transmission member fails to contact the side frame surface effectively
Solution Approach 1:
The first and second reinforcement members are pre-positioned and configured to engage with the side frame before collision occurs. This preliminary arrangement ensures that when deformation happens during offset collision, the load transmission members are already in optimal positions to maintain contact and transmit loads effectively.
Solution Approach 2:
The first and second reinforcement members act as intermediary elements between the bumper and the side frame, providing multiple contact points that ensure continuous load transmission even when the main bumper structure deforms during collision.
Data Source
AI summary
A vehicle body structure including a side frame extending in a front-rear direction, and a lower member located outside the side frame in a vehicle width direction is provided with a load transmission member which is arranged on the lower member, and which comes into contact with a vehicle widthwise outer side surface of the side frame when the lower member moves toward a passenger compartment due to an offset collision.