Vehicle Subframe Detachment Mechanism for Crash Force Redirection
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Solution Overview
Problem
Existing vehicle designs face challenges in redirecting crash forces away from sensitive components during impacts, as crash-absorbing structures often fail to effectively detach and fold, potentially causing further damage by pushing components like the steering rack into the vehicle body.
Innovation Solution
A subframe with a front attachment that detaches and folds downward upon impact, while the rear attachment remains intact, utilizing initiators and strategically designed members to redirect crash forces and prevent damage to critical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the subframe is designed to remain rigid and attached during impact, then structural strength is maintained, but crash forces are not effectively redirected away from sensitive components
Solution Approach 1:
The subframe attachment system is segmented into front and rear attachments with different strength characteristics. The front attachment uses weaker bolts or nodes designed to detach during impact, while the rear attachment uses stronger bolts designed to remain intact. This segmentation allows the subframe to redirect crash forces away from sensitive components while maintaining overall structural integrity through the rear attachment.
2Object-affected harmful factors
If the subframe is designed to detach completely during impact, then crash forces are redirected away from sensitive components, but the subframe may push components like steering rack into the vehicle body
Solution Approach 1:
Different parts of the subframe attachment system are given different local qualities - the front attachment nodes are designed with lower strength to detach and allow downward folding, while the rear attachment nodes are designed with higher strength to remain intact. This local quality differentiation ensures that the subframe redirects crash forces downward away from sensitive components while the rear attachment prevents the subframe from pushing components into the vehicle body.
3Object-affected harmful factors
If initiators are added to enable controlled folding, then the subframe can deflect downward to redirect forces, but device complexity increases
Solution Approach 1:
Initiators such as swages or notches are pre-formed in the subframe members at specific locations before impact occurs. These initiators create predetermined weak points that will begin the folding process when impact forces are applied. By having the folding initiation points prepared in advance, the subframe can reliably deflect downward to redirect crash forces without requiring complex active control systems or sensors during the actual impact event.
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 subframe effectively redirects crash forces, preventing damage to sensitive components by detaching the front attachment and folding downward, thereby reducing the risk of injury and damage to the vehicle's occupants and structure.
Implementation Method 1
at least one initiator configured to cause the subframe to fold downward in event of impact
Implementation Method 2
crash-absorbing structures can be provided in the front and rear of the vehicle... to direct crash forces away from certain areas
Data Source
AI summary
A subframe for a vehicle has a front attachment to a crush rail in the vehicle, and a rear attachment to the vehicle, the subframe comprising at least one initiator configured to cause the subframe to fold downward in event of impact, the subframe configured so that the front attachment detaches as a result of the impact and the subframe is deflected downward, while the rear attachment does not detach.