Vehicle Body Rear Structure Load Path Design
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Solution Overview
Problem
The existing vehicle body rear structures face challenges in securing sufficient rigidity and strength due to large hollow closed sections, which can lead to collapsing deformation under load, and struggle with efficient load transmission between the rear outer wall and the rear girder, while also increasing the complexity of components.
Innovation Solution
A vehicle body rear structure design featuring a rear panel stiffener joined to the rear panel outer member, a rear girder raised from the lateral side, and a corner panel that forms continuous sectional portions with L-shaped sections and ridge lines, along with a bulkhead partitioning the corner section, enhancing load transmission and rigidity through strategic reinforcement and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bulkhead is disposed inside the rear outer wall to partition the closed section, then the rigidity and strength of the rear outer wall are maintained, but the number of structural components increases and construction becomes complicated
Solution Approach 1:
The invention merges the bulkhead function into the corner panel by providing a corner panel that extends along both the rear outer wall and the rear girder, forming a continuous load transmission path. This integration eliminates the need for a separate bulkhead component while maintaining the partitioning and reinforcement function, thereby reducing component count and construction complexity
Solution Approach 2:
The corner panel is segmented into multiple sections: a first section along the rear outer wall, a second section along the rear girder, and a connecting section joining them. This segmentation allows the corner panel to effectively partition the closed section and transmit loads along different structural elements while maintaining a unified functional component
2Ease of manufacture
If the rear outer wall has a relatively large hollow closed section, then the construction is simpler, but the rear outer wall cannot secure sufficient rigidity and strength and is likely to undergo collapsing deformation
Solution Approach 1:
The invention applies local reinforcement by positioning the corner panel specifically at the corner portion where the rear outer wall and rear girder meet. This localized intervention strengthens the critical area without requiring reinforcement throughout the entire structure, maintaining construction simplicity while improving local rigidity and strength to prevent collapsing deformation
3Ease of manufacture
If the rear outer wall has a relatively large hollow closed section, then the construction is simpler, but proper load transmission between the rear outer wall and the rear girder cannot be performed
Solution Approach 1:
The corner panel is divided into a first section extending along the rear outer wall, a second section extending along the rear girder, and a connecting section joining them. This segmentation creates multiple load transmission paths that efficiently transfer loads between the rear outer wall and rear girder while maintaining construction simplicity
Solution Approach 2:
The corner panel provides a continuous load transmission path from the rear outer wall through the connecting section to the rear girder. This continuity ensures reliable load transfer without interruption, maintaining structural reliability while avoiding complex multi-component assemblies
Data Source
AI summary
A vehicle body rear structure is provided with a rear panel stiffener including a stiffener L-shaped sectional portion, a rear girder including an inner L-shaped sectional portion, and a corner panel configured from an upper stiffener extension and a rear panel side extension. The stiffener L-shaped sectional portion has a first ridge line, and the inner L-shaped sectional portion has a second ridge line. The upper stiffener extension is provided with an upper L-shaped sectional portion that is continuous with the respective L-shaped sectional portions, and has a third ridge line that is contiguous with the respective ridge lines. The rear panel side extension is provided with a bulkhead that partitions a corner closed sectional portion.