Vehicle Rear Section Load Transmission via Reinforcement Segmentation
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Solution Overview
Problem
The existing vehicle rear section structure inefficiencies in transmitting rear collision loads to the front side due to bending and buckling of the center frame under rear collision loads, reducing the effectiveness of load transmission.
Innovation Solution
A vehicle rear section structure featuring left and right rear side members, reinforcement members with ridgeline sections extending in a straight line along the front-rear direction, and a rear suspension member, which engage to efficiently transmit rear collision loads to the front side, along with additional components like rear bumper reinforcement and rear cross members to enhance load distribution and transmission paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a center frame is provided at the bottom portion of the spare tire pan to transmit rear collision load, then load transmission capability is improved, but the center frame bends and buckles under rear collision load, reducing transmission efficiency
Solution Approach 1:
The reinforcement structure is divided into multiple segments: reinforcement bars (first reinforcement members) extending in the vehicle width direction at the rear end of the floor frame, and a rear cross member (second reinforcement member) connecting both rear side members. This segmentation allows each component to independently bear and transmit load, preventing buckling of a single continuous frame while maintaining overall structural integrity and load transmission capability.
2Ease of manufacture
If the floor frame and center frame are coupled by an assembly-type reinforcement bar, then assembly flexibility is improved, but the cross-section profile of the spare tire pan bottom bends and protrudes downward, reducing load transmission efficiency
Solution Approach 1:
The reinforcement structure is positioned at a different spatial dimension - specifically at the rear end of the floor frame rather than at the bottom portion of the spare tire pan. The reinforcement bars extend in the vehicle width direction at the rear end, and the rear cross member connects the rear side members, creating a load transmission path that does not interfere with the bending behavior of the spare tire pan bottom, thus maintaining both assembly flexibility and structural integrity.
Data Source
AI summary
A vehicle rear section structure includes: left and right rear side members disposed along a front-rear direction at width direction sides of a rear floor pan; a rear suspension member extending along the vehicle front-rear direction, and attached to front portions of left and right rear side members; a load bearing section projecting upwardly from the rear suspension member; left and right reinforcement members extending along the vehicle front-rear direction, and disposed at a vehicle width direction inner side of rear portions of the left and right rear side members and at a vehicle rear side of the rear suspension member, a rear end portion of the reinforcement member partially overlapping a rear bumper reinforcement in a vehicle front-rear direction view; and a rear cross member linking the left and right rear side members together and partially overlapping the load bearing section in the vehicle front-rear direction view.