Front Subframe Engagement Member for Narrow Offset Collision
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Solution Overview
Problem
Current vehicle body structures are inadequately protected in small overlap or narrow offset frontal collisions, as the crash forces are not effectively managed by the typical crush-zone structures, leading to potential damage to the front wheel and suspension system.
Innovation Solution
A front subframe design featuring left and right longitudinal members with engagement members that extend laterally outward, directing crash forces into the subframe and vehicle body structure during a narrow offset collision, thereby enhancing protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional crush-zone structures are used in the middle 50% of the front end, then head-on and moderate overlap frontal collisions are well protected, but narrow offset frontal collisions are inadequately protected as crash forces are not effectively managed
Solution Approach 1:
The front subframe is segmented into multiple functional components: longitudinal members for structural support, transverse members for connecting left and right sides, and engagement members for capturing crash forces. This segmentation allows each component to specialize in managing specific aspects of crash energy, improving narrow offset collision protection while maintaining overall structural coherence.
Solution Approach 2:
The engagement members act as intermediaries between the external collision object and the internal subframe structure. These members are specifically designed to be engaged by narrow offset impacts and transfer crash forces through the subframe in a controlled manner, protecting the occupant compartment from direct force transmission.
2Strength
If engagement members extend laterally outward beyond the longitudinal members, then crash forces are effectively directed into the subframe during narrow offset collision, but the lateral dimension of the front subframe increases
Solution Approach 1:
The engagement members are positioned specifically at the front ends of the longitudinal members where narrow offset collision forces are most likely to apply. This localized placement provides enhanced crash force resistance exactly where needed, rather than uniformly increasing the lateral dimension of the entire subframe structure.
Solution Approach 2:
The engagement members extend in the lateral dimension only when necessary for force engagement, while the main longitudinal members maintain their primary longitudinal orientation. This dimensional differentiation allows the structure to engage crash forces laterally without significantly increasing the overall lateral footprint of the main subframe structure.
Data Source
AI summary
A front subframe for a vehicle body structure includes left and right longitudinal members which extend in a longitudinal direction of the vehicle body. A front cross member extends in a transverse direction of the body so as to extend between front ends of these longitudinal members. A rear cross member extends in the transverse direction of the body so as to extend between rear ends of the left and right longitudinal members. An engagement member as part of the front subframe is provided at each front end of the left and right longitudinal members. The engagement member is adapted to be engaged by an associated object during a narrow offset frontal collision and direct crash forces into the front subframe and vehicle body structure.