Rear Vehicle Body Structure for Battery-Constrained Subframe Mounting
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Solution Overview
Problem
The increasing use of large batteries in electric and hybrid vehicles poses challenges in ensuring sufficient support rigidity and strength at the rear portion of the vehicle body, making it difficult to mount subframes effectively, which compromises the safety and smoothness of vehicle traffic.
Innovation Solution
A rear structure of the vehicle body is designed with a rear side frame extending in the front-rear direction, linked to a floor panel and a subframe, incorporating subframe fastening portions, link members, and reinforcement frames to distribute and transmit loads, enhancing connection strength and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a subframe is mounted to a cross member on the body side, then support rigidity for devices such as motors and engines can be ensured, but when large batteries are installed, there is a possibility that support members cannot be mounted due to layout constraints with other devices
Solution Approach 1:
The patent divides the support structure into multiple independent fastening portions: a first subframe fastening portion that links the rear side frame to the floor panel, and a second subframe fastening portion that links the rear side frame to the cross member. This segmentation allows the subframe to be supported through multiple pathways, providing adaptability when one mounting location is unavailable due to battery installation.
2Strength
If support members such as subframe cannot be mounted to cross member due to battery layout, then it may be difficult to ensure sufficient support rigidity, but adding complex mounting structures increases device complexity
Solution Approach 1:
The rear side frame is designed with dual functionality: it serves as both a structural component extending in the front-rear direction and as a mounting structure through its integrated fastening portions. The first fastening portion links to the floor panel while the second links to the cross member, allowing the same structural element to provide support through multiple configurations without adding separate complex mounting mechanisms.
3Adaptability or versatility
If the subframe is fastened only to the floor panel, then mounting flexibility is improved, but connection strength may be insufficient compared to dual fastening configuration
Solution Approach 1:
The patent merges two fastening mechanisms into a unified support system: the first subframe fastening portion connecting to the floor panel and the second subframe fastening portion connecting to the cross member. These combined fastening portions work together to provide both the mounting flexibility needed for battery layout accommodation and the enhanced connection strength through distributed load paths.
Data Source
AI summary
Provided is a rear structure of vehicle body, including a floor panel constituting a floor portion at a rear portion of a vehicle body; a rear side frame extending in a front-rear direction of the vehicle body outside the floor panel in a vehicle width direction; and a subframe installed below the floor panel and supporting suspension components. The rear side frame includes a subframe fastening portion to which the subframe is fastened, and the subframe fastening portion links the rear side frame and the floor panel.