Front Pillar Upper Structure Optimized Wall Angle
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Solution Overview
Problem
Existing techniques are inadequate for limiting deformation of front pillars in vehicles against loads from the front, such as in offset collisions and small overlap collisions, as they do not effectively distribute and manage the stress generated by these impacts.
Innovation Solution
A front pillar upper structure with an outer and inner member forming a closed cross-section, where the second wall part has an angle of inclination between 41° to 68° relative to the principal axis of inertia, enhancing its strength against up-down directional loads and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the front pillar structure uses conventional design without optimized wall angle, then the structure is simpler to manufacture, but the cross-sectional yield strength is insufficient and deformation occurs under front load
Solution Approach 1:
The patent optimizes the angle of inclination of the second wall part to be within 41° to 68° relative to the principal axis of inertia. This parameter change in the geometric configuration of the inner member's second wall part enhances the moment resistance and distributes collision loads more effectively, thereby improving cross-sectional yield strength without requiring additional structural components
Solution Approach 2:
The front pillar upper structure employs a composite configuration with an outer member and an inner member joined together to form a closed cross-section. The inner member includes a flange part, first wall part, and second wall part with optimized angles. This composite structure combines multiple geometric elements to achieve superior strength characteristics under front collision loads
2Strength
If the second wall part has angle of inclination close to right angle to input load direction, then the structure is easier to manufacture with standard angles, but the strength against input load is reduced and cross-sectional deformation occurs
Solution Approach 1:
The patent specifies an optimized angle range of 41° to 68° for the second wall part relative to the principal axis of inertia. This parameter optimization balances manufacturing feasibility with enhanced load-bearing capacity, allowing the structure to resist front collision loads effectively while remaining producible with standard manufacturing tolerances
Solution Approach 2:
The patent applies different angular characteristics to different parts of the inner member: the second wall part has a specific inclination angle of 41° to 68° optimized for moment resistance, while other parts of the structure maintain different geometric properties. This local optimization of angular parameters enhances overall structural performance without requiring uniform complexity throughout
3Strength
If the front pillar structure uses thicker plate to prevent deformation, then the strength and deformation resistance are improved, but the vehicle weight increases
Solution Approach 1:
The patent optimizes the geometric parameters of the inner member, specifically the angle of inclination of the second wall part (41° to 68°), to enhance structural efficiency. This parameter optimization allows the front pillar to achieve improved deformation resistance through intelligent geometry rather than increased material thickness, thereby avoiding unnecessary weight gain
Solution Approach 2:
The optimized angular configuration of the second wall part creates a more efficient load path that better distributes collision forces throughout the closed cross-section structure. This geometric optimization enhances the structure's ability to resist deformation under front load without requiring additional material, thus preventing weight increase
Data Source
AI summary
A front pillar upper structure of a vehicle includes an outer member and an inner member. The inner member forms an inner wall of the front pillar upper structure in a vehicle-width direction, and is joined to the outer member forming an outer wall in the vehicle-width direction to form a closed cross-section structure. The inner member includes a flange part, a first wall part, and a second wall part. The second wall part is disposed between the flange part located on the lower side of the inner member and joined to the outer member and the first wall part located above the flange part. The second wall part has an angle of inclination in a range from 41° to 68° to a principal axis of inertia extending in the vehicle-width direction in a cross section substantially vertical to a longitudinal direction of the front pillar upper structure.