Vehicle Body Joint Structure for Frontal Collision Load Transfer
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Solution Overview
Problem
Current vehicle body structures face safety issues during frontal collisions, where the front pillar and rear lower member can easily separate, leading to safety problems due to inadequate connection and energy distribution during impact.
Innovation Solution
A vehicle body structure that firmly connects the front pillar, side sill, and rear lower member using a connection member with specific mounting walls and joints, forming unitary one-piece structures to enhance crashworthiness and uniform impact energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the front pillar and rear lower member are connected using conventional fasteners and welding, then the assembly process is simple, but the connection strength is insufficient during frontal collision
Solution Approach 1:
The connection member integrates multiple connection functions into a single component that simultaneously connects the front pillar, side sill, and rear lower member. This merging of connection functions into one unified structure provides enhanced connection strength during collision while managing structural complexity through functional integration.
Solution Approach 2:
The connection member employs composite material construction combining aluminum-based materials with reinforced structures. This allows the connection member to achieve superior strength characteristics compared to conventional single-material connections, providing adequate connection strength during frontal collision without excessive weight increase.
2Weight of moving object
If the front pillar, side sill, and rear lower member are made of aluminum-based material for weight reduction, then the vehicle weight decreases, but the connection reliability during impact deteriorates
Solution Approach 1:
The connection member uses composite material construction that combines aluminum-based materials with reinforced structural elements. This composite approach maintains the weight reduction benefits of aluminum while providing enhanced connection reliability during impact through the synergistic properties of the composite structure.
Solution Approach 2:
The connection member features localized reinforcement at critical connection points where the front pillar, side sill, and rear lower member join. This local quality enhancement provides improved connection reliability at impact zones while maintaining overall lightweight aluminum construction in non-critical areas.
3Strength
If conventional connection methods are used between front pillar and rear lower member, then manufacturing is simple, but impact energy distribution becomes uneven during collision
Solution Approach 1:
The connection member consolidates multiple connection functions into a single integrated component that simultaneously joins the front pillar, side sill, and rear lower member. This merging provides uniform impact energy distribution across all connection points while managing manufacturing complexity through standardized production processes for the integrated component.
Data Source
AI summary
A vehicle body structure includes: a front pillar joined to a dash panel; a front side member extending from the dash panel toward the front of a vehicle; a side sill connected to a bottom end of the front pillar; a rear lower member connecting a rear portion of the front side member and a front portion of the side sill; and a connection member connecting at least two of the front pillar, the side sill, and the rear lower member. The connection member is integrally connected to the front pillar, the side sill, or the rear lower member to form a unitary one piece structure therewith.