Segmented Center Pillar Reinforcement for Frameless Door Stiffness
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Solution Overview
Problem
Frameless doors in vehicles compromise the structural stiffness of the center pillar, making it difficult to maintain the passenger compartment during side collisions or rollovers, thereby increasing passenger injury risk.
Innovation Solution
A center pillar design with a divided internal structure, comprising a center pillar internal upper and lower, reinforced by internal and external reinforcements, and additional connection members and reinforcement plates, ensuring sufficient stiffness even with reduced cross-sectional area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a frameless door is applied to achieve beautiful design, then the aesthetic appearance is improved, but the cross-sectional area of the center pillar is reduced, resulting in insufficient stiffness
Solution Approach 1:
The center pillar internal is divided into upper and lower portions with different cross-sectional areas. The upper portion has a reduced cross-sectional area to accommodate frameless door design, while the lower portion maintains a larger cross-sectional area to provide sufficient stiffness and structural support.
Solution Approach 2:
Different portions of the center pillar are given different structural characteristics. The upper portion is optimized for aesthetics with reduced material, while the lower portion is optimized for structural strength with increased material, creating local quality variations that satisfy both aesthetic and structural requirements.
2Adaptability or versatility
If the cross-sectional area of the center pillar is reduced upwards to accommodate frameless door design, then the degree of freedom in design is increased, but the stiffness of the center pillar is compromised
Solution Approach 1:
The center pillar internal is segmented into upper and lower portions with different cross-sectional areas. This segmentation allows the upper portion to be optimized for design freedom and aesthetics, while the lower portion maintains sufficient stiffness for structural integrity.
Solution Approach 2:
The solution moves from a uniform cross-sectional design to a variable cross-sectional design along the height dimension. By varying the cross-sectional area in the vertical dimension, the patent achieves both design freedom and structural stiffness without compromising either requirement.
3Strength
If additional reinforcement structures are added to the center pillar to improve stiffness, then the structural strength is enhanced, but the weight of the center pillar increases
Solution Approach 1:
Reinforcement is applied locally rather than uniformly throughout the entire center pillar. The lower portion receives additional reinforcement to provide necessary stiffness, while the upper portion maintains a lighter construction, optimizing the strength-to-weight ratio.
Solution Approach 2:
The center pillar internal upper and lower portions are merged into a single integrated structure, allowing for optimized material distribution that provides necessary stiffness while minimizing weight. The seamless integration eliminates the need for additional heavy connection elements.
Data Source
AI summary
A center pillar for a vehicle with improved stiffness, which has a sufficient stiffness in the event of rollover or a side collision of the vehicle, includes: a center pillar internal upper including an upper portion coupled to a roof side rail internal; and a center pillar internal lower including an upper portion coupled to a lower portion of the center pillar internal upper, and a lower portion coupled to a side sill to configure a center pillar internal, in which a center pillar reinforcement internal is coupled to an external surface of the center pillar internal, and a center pillar reinforcement external is coupled to an external surface of the center pillar reinforcement internal.