Rear Vehicle Body Structure Impact Load Transfer
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Solution Overview
Problem
Existing rear vehicle body structures face challenges in reliably protecting mounted objects below the rear floor panel while minimizing weight and part count, as increasing cross member thickness and peripheral reinforcement lead to increased vehicle weight and complexity.
Innovation Solution
A rear vehicle body structure featuring a front floor panel, rear floor panel with bent corner portions forming a closed cross section, and a front cross plate connecting the rear floor panel and side sills, which efficiently transmits impact loads to the side sills, reducing the need for additional reinforcement parts and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the cross member is increased to receive impact load, then the strength and rigidity are improved, but the vehicle weight is increased
Solution Approach 1:
The front wall of the rear floor panel is divided into multiple bent corner portions (first, second, and third bent corner portions) at different vertical heights. Each bent corner portion acts as a separate reinforcement element that contributes to the overall strength, replacing the need for a single thick cross member.
Solution Approach 2:
The reinforcement structure transitions from a single-plane thick cross member to a multi-dimensional configuration with bent corner portions extending at different vertical heights. This spatial distribution of reinforcement elements provides equivalent or superior strength while reducing material usage and weight.
2Strength
If a reinforcing structure is added to the peripheral region of the cross member, then the strength is improved, but the number of parts and vehicle weight are increased
Solution Approach 1:
The first, second, and third bent corner portions are integrated into a single continuous front wall structure of the rear floor panel. This merging of reinforcement elements into one component eliminates the need for separate reinforcing parts while maintaining comprehensive peripheral reinforcement.
Solution Approach 2:
The front wall with multiple bent corner portions serves multiple functions simultaneously: it provides structural reinforcement, acts as a load distribution path, and maintains the closed cross-section geometry. This multi-functionality reduces the need for additional dedicated reinforcing parts.
Data Source
AI summary
A rear portion of a vehicle body includes a front floor panel, a rear floor panel, a pair of left and right side sills, and a front cross plate. The rear floor panel has a higher upper surface height than the front floor panel. The front cross plate connects a rear portion of the front floor panel and a front wall of the rear floor panel, and an outer end portion in a vehicle width direction is coupled to the left and right side sills. The front wall of the rear floor panel has a plurality of bent corner portions having a side view shape bent in a substantially L shape. At least one of the bent corner portions constitutes a closed cross section extending along the vehicle width direction together with the front cross plate in a vertical height range of the left and right side sills.