Integrated Front Hinge Pillar Structure for Small Overlap Crashes
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Solution Overview
Problem
Existing vehicle front structures face issues with mechanical strength, sealing, and manufacturing costs, particularly in small overlap frontal collisions, where the front reinforcement deforms excessively, risking intrusion into the passenger compartment and requiring complex assembly.
Innovation Solution
A single-piece front foot structure combining the upper front pillar gusset, front pillar reinforcement, and front reinforcement on the passenger side, made from ultra-high yield strength steel, with differential hardening or laser splicing, and optionally reinforced by a complementary piece, to enhance mechanical strength and simplify assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple separate parts are assembled to form the front pillar structure, then manufacturing flexibility and cost control are improved, but sealing issues arise and assembly complexity increases
Solution Approach 1:
The patent combines multiple separate structural parts (front reinforcement pillar, upper front pillar gusset, and front reinforcement on the passenger side) into a single integrated front foot structure. This merging eliminates the sealing issues between multiple components and simplifies the assembly process by removing the need for welding or riveting operations, directly resolving the contradiction between manufacturing flexibility and assembly complexity
2Strength
If the front reinforcement is made stronger to prevent deformation in small overlap collisions, then impact resistance is improved, but the risk of intrusion into the passenger compartment increases
Solution Approach 1:
The patent applies local quality by creating different structural characteristics in different regions of the front foot. The central body portion is designed with specific thickness and strength properties to handle direct impact forces, while the front extension portions have optimized geometries to manage lateral loads. This localized optimization allows the structure to be strong enough to resist impact deformation while maintaining proper deformation characteristics to prevent passenger compartment intrusion
Solution Approach 2:
The patent utilizes parameter changes by employing differential hardening processes that create different mechanical properties in different zones of the same component. The central body is hardened to higher strength levels than the front extension areas, allowing the structure to absorb impact energy through controlled deformation in specific regions while maintaining overall structural integrity
3Ease of manufacture
If traditional assembly methods with multiple parts are used, then manufacturing cost control is improved, but sealing problems occur
Solution Approach 1:
By merging multiple separate parts into a single integrated front foot structure, the patent eliminates the sealing problems that arise from joining multiple components. The single-piece construction ensures continuous sealing surfaces without gaps or misalignments that would occur at weld or rivet joints, directly improving sealing reliability while maintaining cost control through simplified manufacturing
4Ease of manufacture
If separate structural parts are assembled together, then manufacturing flexibility is improved, but production time increases
Solution Approach 1:
The integration of multiple structural parts into a single front foot component eliminates the time required for assembly operations such as welding or riveting. This single-piece manufacturing approach directly reduces production time while maintaining manufacturing flexibility through optimized forming processes, thereby improving overall productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The integrated structure improves impact resistance, reduces vehicle weight, and lowers production costs by eliminating the need for separate assembly, while maintaining robustness and energy absorption during collisions.
Implementation Method 1
a step of heating a steel blank to a temperature beyond which the steel structure becomes austenitic
Implementation Method 2
a step of hot drawing the heated blank in a drawing tool having at least two zones
Implementation Method 3
a step of differentially quenching the different zones, such that at least one zone of the drawing tool is cooled at a cooling rate higher than the cooling rate applied to another zone
Implementation Method 4
a laser welding step of at least two sheet metal elements arranged adjacently so as to form a sheet metal blank
Data Source
Figure 1~2
AI summary
The invention relates to a front hinge pillar (9) of a vehicle, consisting of a stamped part comprising a central body (11) that is intended to extend vertically, so as to exhibit a lower end (13) and an upper end (15) and lateral edges, the front hinge pillar (9) being characterized in that it further comprises a front extension (17) extending from one of said lateral edges of said central body (11) such that said central body (11) and said front extension (17) form a single part. The invention also relates to the methods for producing such a front hinge pillar (9).