Rear Floor Side Member Closed Section for Crash Strength and Cargo Space
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Solution Overview
Problem
The limited height of the rear floor side member in vehicle bodies restricts the cross-section, leading to insufficient strength and interference with lower chassis parts, which can damage autonomous driving equipment and reduce cargo loading space, especially in vehicles with high-weight materials and vibration-sensitive components.
Innovation Solution
A vehicle body rear structure with a rear floor side member mounted on the upper portion of the rear floor panel, integrated with a cross member and side members, forming closed sections and flanges for enhanced strength and impact distribution, allowing for increased interior space and secure mounting of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the height of the rear floor side member is increased to improve strength, then collision response performance is improved, but interference with lower chassis parts occurs and cargo loading space is reduced
Solution Approach 1:
The patent transitions from a conventional floor-side member arrangement to a rear floor side member configuration that forms a closed section with the rear floor panel. This dimensional reorganization allows the side member to extend vertically without interfering with lower chassis parts, as the closed section structure provides structural efficiency at reduced horizontal footprint, thereby maintaining cargo space while achieving required strength.
2Reliability
If the height of the rear floor side member is increased to improve collision response, then crash response performance is improved, but interference with lower chassis parts occurs
Solution Approach 1:
The patent repositions the rear floor side member to form a closed section with the rear floor panel, utilizing the vertical dimension more effectively. This closed section configuration achieves superior crash response performance through enhanced structural rigidity and load distribution, while the optimized geometry prevents interference with lower chassis components by eliminating protrusions into the underbody space.
3Strength
If the cross-section of the rear floor side member is increased to secure strength, then collision resistance is improved, but cargo loading space is reduced
Solution Approach 1:
The patent employs a closed section structure formed by the rear floor side member and rear floor panel, creating a composite structural system. This closed section configuration provides exceptional strength-to-weight ratio and resistance to collision forces, while the integrated design optimizes the use of structural space, preventing encroachment into cargo loading areas and maintaining maximum cargo capacity.
Data Source
AI summary
An embodiment rear structure for a vehicle body includes a rear floor panel and a rear floor side member mounted on both sides of an upper portion of the rear floor panel along a length direction of the vehicle body and defining a side closed section together with the rear floor panel.