Closed-Section Side Sill Structure for Side Collision Load Transfer
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Solution Overview
Problem
Existing vehicle side sill structures experience a decrease in absorption efficiency of side collision loads, leading to potential deformation and failure against the floor panel due to applied moments.
Innovation Solution
A side sill structure comprising a combination of a sill inner member and a sill outer member forming a closed cross-section, reinforced by stiffeners and partitioning members, which connect to form a strong load transmission path through corner portions and flanges, enhancing the structure's ability to absorb and distribute collision loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcement members are disposed on an outer side below each side sill to extend across bulkheads, then torsional rigidity of the vehicle body is secured, but absorption efficiency of side collision load decreases
Solution Approach 1:
The side sill is divided into multiple components: sill inner member, sill outer member, partitioning members, and stiffeners. This segmentation allows each component to perform specific functions - the sill inner member with L-shaped cross-section absorbs collision loads through controlled deformation, while the sill outer member and stiffeners maintain structural rigidity and transmit loads to the floor panel.
Solution Approach 2:
The stiffener is specifically arranged along the corner portion formed by the inner side wall and upper wall of the sill inner member, providing localized reinforcement at the critical corner region. This local quality enhancement improves load transmission efficiency without requiring extensive reinforcement throughout the entire side sill structure.
2Stability of the object's composition
If reinforcement members are disposed on an outer side below each side sill, then structural rigidity is improved, but moment applied to side sill increases during side collision
Solution Approach 1:
The stiffener extends in the vehicle width direction along the corner portion of the sill inner member, adding a dimensional element that effectively distributes and transmits collision loads to the floor panel. This dimensional arrangement creates an efficient load path that reduces the moment applied to the side sill during side collisions.
3Strength
If a closed cross-section is formed by sill inner member and sill outer member, then load transmission capability is improved, but device complexity increases
Solution Approach 1:
The sill inner member and sill outer member are merged to form a closed cross-sectional structure, combining their individual strengths to create a rigid load-bearing framework. This merging approach enhances load transmission capability while maintaining structural efficiency through the integrated closed-section design.
Data Source
AI summary
A side sill structure with a side sill is provided. The side sill extends in a vehicle front-rear direction on an outer side in a vehicle width direction of a floor panel, and defines a closed cross-section by a combination of a sill inner member disposed on a vehicle inner side and a sill outer member disposed on a vehicle outer side. The side sill includes a plurality of partitioning members located in the closed cross-section, and a stiffener connecting the partitioning members to one another in a longitudinal direction of the side sill. In the side sill structure, the stiffener is arranged along a corner portion formed by an inner side wall and an upper wall on the vehicle inner side of the sill inner member.