Rear Body Structure With Closed Sections for Rear Collision Loads
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Solution Overview
Problem
The existing rear vehicle body structures face challenges in maintaining strength and preventing deformation during rear collisions, as they often rely solely on the side member to support loads, leading to excessive deformation and inadequate energy absorption.
Innovation Solution
A rear vehicle body structure design that includes a rear side member connected to a back beam, a rear floor with transverse reinforcement, and a back panel with specific flanges and extensions forming closed cross-sections, which enhances connectivity and strength by distributing loads effectively across the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If only the side member supports the load from the rear back beam during rear collision, then the structure is simpler, but the vehicle body deforms excessively and strength is insufficient
Solution Approach 1:
The connection structure is divided into multiple functional segments: the rear floor side portion with stepped configuration, the rear floor transverse reinforcement extending from it, and the back panel with specifically shaped flanges. Each segment handles specific portions of the load, distributing the stress path to prevent excessive deformation while maintaining overall structural integrity during rear collisions.
Solution Approach 2:
The rear floor side portion incorporates a stepped configuration that extends in the vehicle width direction, adding a dimensional element to the load path. The back panel flanges are shaped to extend in multiple directions, creating a multi-dimensional connection network that enhances strength without requiring additional separate members.
2Stability of the object's composition
If the back panel transverse member and D pillar part use an annular connection structure, then the tail gate torsion is prevented, but it is difficult to respond to twisting of the tail gate opening and secure vehicle body strength
Solution Approach 1:
The connection structure employs different local configurations optimized for specific functions: the rear floor side portion uses a stepped configuration for load distribution, the transverse reinforcement provides横向 stiffness, and the back panel flanges are shaped to specifically address twisting forces. This localized optimization allows the structure to respond effectively to both torsion and rear collision loads.
Solution Approach 2:
The connection structure integrates multiple components with different geometric properties and stiffness characteristics: the rear floor side portion, the transverse reinforcement, and the back panel flanges form a composite structural system that combines the advantages of each element to achieve both torsion resistance and rear collision strength.
3Strength
If a separate member is added to connect the rear floor, side member and back panel, then vehicle body strength is improved, but the assembly process becomes more complex
Solution Approach 1:
The rear floor side portion, the rear floor transverse reinforcement, and the back panel flanges are integrated into a unified connection structure that performs multiple functions simultaneously. This merging eliminates the need for separate connecting members while maintaining enhanced vehicle body strength, as the integrated structure provides both structural support and load distribution functions.
Solution Approach 2:
The integrated connection structure performs multiple functions: it connects the rear floor, side member, and back panel; distributes collision loads; prevents tail gate torsion; and responds to twisting forces. This multi-functionality is achieved through the stepped configuration of the rear floor side portion and the specifically shaped back panel flanges that extend to engage with multiple components.
Data Source
AI summary
A rear vehicle body structure may include a rear side member connected to a back beam provided at the rear of the vehicle body, and a rear floor including a rear floor side portion with which the rear side member is connected, a tire wall formed with concave step from the rear floor side portion, and a rear floor transverse reinforcement formed protrude along the shape of the rear floor side portion and the tire wall from the rear of the rear floor side portion and the tire wall.