Center Pillar Structure with High-Strength Lower Portion
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Solution Overview
Problem
The existing center pillar structures in vehicles tend to increase the intrusion amount into the vehicle cabin during side collisions due to excessive deformation of the belt-shaped low-strength portions.
Innovation Solution
A center pillar structure is designed with a pillar upper portion and a pillar lower portion, where the pillar lower portion includes a high-strength portion with a tensile strength higher than the pillar lower main body portion, which is bonded to a rocker and extends in the vehicle height direction, controlling deformation into an approximately J-shape and reducing cabin intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a belt-shaped low-strength portion is provided on the lower portion of the center pillar to control deformation mode, then the deformation mode is controlled, but the intrusion amount into the vehicle cabin increases
Solution Approach 1:
The invention applies local quality by providing a low-strength portion with specific dimensions (width W1 and length L1) at the lower portion of the center pillar. This localized low-strength region controls the deformation mode during side collision by allowing controlled deformation in a specific area, while the rest of the pillar maintains higher strength to prevent excessive intrusion into the cabin.
Solution Approach 2:
The invention changes the strength parameter of the center pillar by introducing a low-strength portion with different material properties or heat treatment conditions. This parameter change creates a controlled deformation zone that directs the deformation mode while limiting the overall intrusion amount through proper dimensional design of the low-strength portion.
2Shape
If the lower portion of the center pillar is made with lower strength to control deformation, then the deformation mode is controlled, but the overall strength of the center pillar is reduced
Solution Approach 1:
The invention uses local quality by creating a low-strength portion only in the specific region where deformation control is needed (lower portion with dimensions W1 and L1), while the upper and middle portions of the center pillar maintain higher strength through conventional hot stamping or material selection, thus controlling deformation mode without significantly reducing overall pillar strength.
Solution Approach 2:
The center pillar is segmented into different strength zones: a high-strength upper portion, a low-strength intermediate portion (with dimensions W1 and L1) for deformation control, and a high-strength lower portion near the rocker. This segmentation allows each zone to perform its specific function while maintaining overall structural integrity.
Data Source
AI summary
A center pillar structure comprises a center pillar including a center pillar outer panel. The center pillar outer panel includes a pillar upper portion that constitutes an upper portion of the center pillar outer panel and is bonded to a roof side rail, and a pillar lower portion that constitutes a lower portion of the center pillar outer panel and is bonded to a rocker. The pillar lower portion includes a pillar lower main body portion having a tensile strength which is lower than a tensile strength of the pillar upper portion, and a high-strength portion that is disposed on the pillar lower portion and extends in the vehicle height direction, the high-strength portion having a tensile strength which is higher than the tensile strength of the pillar lower main body portion.