Cast Vehicle Rear Structure for Access Opening Collision Rigidity
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Solution Overview
Problem
Existing vehicle rear portion structures do not adequately address the rigidity and collision safety of the areas rearward of the suspension member, particularly around the access opening and rear door, which are prone to deformation during rear-end collisions.
Innovation Solution
A vehicle rear portion structure featuring integrally cast rear portion structural members, including a cross-connection member and connecting members, which enhance rigidity by forming annular shapes and truss structures to distribute and absorb collision loads, thereby improving the vehicle's overall rigidity and protecting the cabin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only suspension member and suspension tower are integrally formed by casting, then collision safety is improved to some extent, but the rigidity of the vehicle rear portion is not sufficiently improved
Solution Approach 1:
The patent combines multiple structural members (suspension member, suspension tower, and rear side member) into a single integrally cast rear portion structural member, creating a unified structure that improves both collision safety and rigidity simultaneously, rather than treating them as separate components
Solution Approach 2:
The patent extends the integral casting to include the rear side member, adding structural continuity in the vehicle width direction. This dimensional extension creates a more comprehensive rigid framework that prevents deformation in multiple directions during rear-end collisions
2Ease of manufacture
If the vehicle rear portion structure is simplified, then manufacturing is easier, but the rigidity around the access opening and rear door is insufficient
Solution Approach 1:
The patent integrates the rear side member into the main structural member through integral casting, eliminating the need for separate connections and assemblies. This merging maintains manufacturing simplicity while simultaneously providing structural reinforcement around the access opening and rear door areas
Data Source
AI summary
The vehicle rear portion structure includes a pair of rear portion structural members spaced apart in the vehicle width direction, a pair of rear side members spaced apart in the vehicle width direction, and a cross-connection member connecting the pair of rear portion structural members to each other, the rear portion structural member is a hollow member in which a body portion, a tower portion, and a suspension member portion are integrally cast, and a pair of arm portions connected to the tower portion.