U-Shaped Vehicle Rear Structure for Collision Load Rigidity
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Solution Overview
Problem
Existing vehicle designs fail to effectively address the need for improving the rigidity and structural integrity of the vehicle rear portion, particularly in the vehicle rear portion, and the vehicle rear structure, especially in the area behind the rear component member, where the collision safety and rigidity are not sufficiently enhanced.
Innovation Solution
A vehicle rear structure comprising a pair of rear component members, rear side members, a cross connection member, and vertical posts, where the rear component member is a hollow member integrally cast with a suspension member and tower portion, and the cross connection member forms a U-shape to enhance rigidity, with vertical posts connecting the arm and rear side members, thereby forming a rectangular ring shape to improve structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suspension member and suspension tower are integrally molded by casting, then collision safety is improved to some extent, but the rigidity of the vehicle rear portion behind the casting member is insufficient
Solution Approach 1:
The structure is divided into multiple segments: the casting member (suspension member and tower), the cross connection member, and the rear side member. These segmented components work together to distribute collision loads, with each segment contributing to overall structural integrity and rigidity behind the casting member.
Solution Approach 2:
The cross connection member extends in the vehicle width direction (lateral dimension) and connects to the rear side member that extends in the vehicle length direction, creating a three-dimensional load distribution network. This multi-dimensional configuration enhances rigidity by distributing forces across multiple spatial dimensions rather than along a single line.
2Reliability
If the rear side member extends rearward from the main body portion, then collision load can be received by the high rigidity rear side member, but the structural complexity increases
Solution Approach 1:
The rear side member is integrated with the cross connection member and vertical post to form a unified structural assembly. This merging of components creates a cohesive load-bearing structure that receives and distributes collision loads efficiently while maintaining manufacturing feasibility through standardized joining methods.
3Strength
If a rectangular ring shape is formed by the rear side member, vertical post, arm portion, and tower portion, then the rigidity of the rear portion is further improved, but the manufacturing complexity increases
Solution Approach 1:
The rectangular ring structure is segmented into manufacturable components: the tower portion (integrally cast with suspension member), the cross connection member with arm portions, the vertical post, and the rear side member. Each segment can be manufactured using appropriate processes (casting, extrusion, forming) and then assembled, balancing structural rigidity with manufacturing ease.
Solution Approach 2:
The structure employs composite construction with the casting member (metal casting), extruded members (cylindrical extrusion), and formed members (rear side member), combining different manufacturing processes and material forms to achieve the required rigidity while maintaining ease of manufacture for each component.
Data Source
AI summary
The vehicle rear structure comprises a pair of rear component members, a pair of rear side members, a cross connection member, and a pair of vertical posts. The cross connection member includes a connecting portion and an arm portion. The connecting portion is disposed rearward of the rear component member and extends in the vehicle width direction. The arm portion extends from both ends of the connecting portion in the vehicle width direction toward the front of the vehicle and is connected to the tower portion. The cross connection member has a substantially U-shape convex toward the rear of the vehicle in a plan view. The vertical post vertically connects the arm portion and the rear side member.