Stepped Joining Portions for Vehicle Body Rigidity
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Solution Overview
Problem
The existing vehicle body structure has limitations in increasing the rigidity of the fender apron region due to shear loads acting on joining surfaces, making it vulnerable to collision, vertical, and lateral loads.
Innovation Solution
The vehicle body structure incorporates stepped joining portions with longitudinal, transverse, and vertical elements in the fender apron member, shock absorber housing, and side reinforcement member, along with arcuate expansion portions, to enhance rigidity and load dispersion across various load directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional joining portions are used to connect the shock absorber housing and side reinforcement member, then the structure is simple and easy to manufacture, but the rigidity of the fender apron region is insufficient and vulnerable to collision and lateral loads
Solution Approach 1:
The joining portions are segmented into multiple directional components (longitudinal, transverse, and vertical joining portions) that separately address different load directions. This segmentation allows each portion to optimize its load-bearing capacity for specific directions, collectively achieving superior overall rigidity while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
The design transitions from traditional single-plane joining to multi-dimensional stepped joining portions that extend in longitudinal, transverse, and vertical directions. This dimensional expansion creates a three-dimensional load distribution network that significantly enhances rigidity by engaging multiple structural dimensions simultaneously
2Reliability
If joining surfaces are oriented to resist certain loads, then those specific loads are better resisted, but other方向的 loads become vulnerable because shear load acts in the direction coinciding with the joining surface
Solution Approach 1:
The stepped joining portions are designed with multi-directional capabilities, where each joining portion serves multiple functions: longitudinal portions resist front collision loads, transverse portions resist lateral loads, and vertical portions resist vertical loads. This multi-functionality allows a single joining structure to reliably handle diverse load conditions without requiring separate specialized joints for each direction
Solution Approach 2:
The joining portions exhibit asymmetric geometry optimized for specific load directions, with each portion (longitudinal, transverse, vertical) having distinct orientations and dimensions. This asymmetric design allows each component to be specifically tailored for its primary load direction while collectively providing comprehensive multi-directional load resistance
Data Source
AI summary
A vehicle body structure includes a fender apron member, a shock absorber housing joined to the fender apron member, and a side reinforcement member configured to connect the fender apron member and the shock absorber housing to a lower side of a front pillar and reinforce a side surface of an engine room, wherein the shock absorber housing and the side reinforcement member comprise stepped joining portions corresponding to and joined to each other.