Vehicle Rear Side Structure Extension Member Load Path
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Solution Overview
Problem
Existing vehicle body rear side structures fail to effectively enhance rigidity to resist load from rear wheels and sub-frames while minimizing weight and preventing collapse, as seen in previous anti-collapse pillar technologies.
Innovation Solution
A vehicle body rear side structure comprising a rear side frame, wheel house, and rear panel with an extension member that transmits loads to the rear panel and wheel house, ensuring rigidity by aligning the extension member with the floor cross member and connecting it to the sub-frame via a stay, and incorporating a curved portion for efficient load transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an anti-collapse pillar is used to prevent the rear side frame from collapsing, then the rear side frame rigidity is improved, but the vehicle weight increases
Solution Approach 1:
The wheel house is divided into an upper portion and a lower portion (extension member), with the extension member specifically extending from the outer wall of the rear side frame toward the outer side in the width direction. This segmentation allows the load-bearing function to be distributed to specific structural elements rather than requiring a complete reinforcement of the entire rear side frame.
Solution Approach 2:
The rear panel is inclined downward toward the outer side in the width direction and connected to the lower portion of the extension member, creating a three-dimensional load transmission path. This dimensional arrangement allows loads to be distributed across multiple spatial dimensions (vertical and lateral), improving rigidity without requiring additional weight in a single location.
2Reliability
If the extension member is aligned with the floor cross member and connected to the sub-frame via a stay, then the load transmission efficiency is improved, but the structural complexity increases
Solution Approach 1:
The extension member is aligned with the floor cross member, and the stay connects both the extension member and the sub-frame, merging multiple load-bearing elements into a coordinated system. This combination creates an integrated load transmission path that improves reliability while the modular design keeps the complexity manageable.
3Strength
If the rear panel is inclined downward toward the outer side and connected to the extension member, then the rigidity against width-direction loads is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The rear panel is specifically designed with an inclination toward the outer side in the width direction, creating local structural quality that targets the specific loading conditions (width-direction loads). This localized geometric feature provides the necessary rigidity without requiring high precision across the entire structure, only at the critical connection areas.
Data Source
AI summary
A vehicle body rear side structure is disposed in a vehicle. The vehicle body rear side structure includes: a rear side frame disposed on an outer side of a rear portion of the vehicle in a width direction; a wheel house, located above the rear side frame; and a rear panel disposed to the rear of the wheel house and located on an outer side of the rear side frame. A lower portion of the wheel house is composed of an extension member extending from an outer wall of the rear side frame toward an outer side in the width direction of the vehicle. The rear panel is inclined downward toward the outer side in the width direction of the vehicle and is connected to a lower portion of the extension member.