Vehicle Body Rear Structure for Crash Load Dispersion and NVH
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing vehicle body rear structures lack effective connectivity and load dispersion during collisions, limiting the improvement of NVH performance and overall vehicle strength.
Innovation Solution
A vehicle body rear structure with enhanced connectivity is achieved through a rear opening, rear end module, and rear cross member, which are integrally connected via engage portions, along with a chassis frame and rear side member, to reinforce the rear parts and distribute crash loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rear back beam is directly connected to the upper body, then the connectivity and structural strength are improved, but the device complexity increases
Solution Approach 1:
The rear connection structure is divided into modular components: rear opening, rear end module, rear cross member, and rear engage portion. Each component serves a specific function and can be manufactured independently, then assembled together to form the complete connection structure, achieving both strength and manageable complexity
Solution Approach 2:
The rear engage portion is inserted through the rear opening and engages with the rear end module and rear cross member in a nested arrangement. The rear end module contains the rear opening, while the rear cross member is positioned within the rear end module structure, creating a compact nested configuration that achieves strong connectivity without excessive complexity
2Reliability
If the rear back beam is directly connected to the upper body, then the collision load distribution is improved, but the manufacturing complexity increases
Solution Approach 1:
The connection structure is segmented into separate manufacturable components that can be produced using standard manufacturing processes, then assembled through the rear engage portion insertion method, balancing manufacturing ease with reliable load distribution
Solution Approach 2:
The rear engage portion acts as an intermediary component that facilitates the connection between the rear opening and the rear end module. This intermediary element enables assembly through a standardized insertion process, making manufacturing easier while ensuring reliable collision load distribution through the integrated structure
3Object-affected harmful factors
If the rear connection structure is integrated, then the NVH performance is improved, but the device complexity increases
Solution Approach 1:
The rear opening, rear end module, and rear cross member are merged into a single integrated connection structure through the rear engage portion, creating a unified rigid framework that effectively reduces NVH. The merging of these components into one functional unit improves noise and vibration performance without requiring excessive complexity in individual components
Data Source
AI summary
An embodiment rear structure of a vehicle body includes a rear opening having a first closed shape surrounding a rear of an upper body and mounted on the rear of the upper body, a rear end module having a second closed shape surrounding the rear opening and connected in a length direction of the vehicle body, and a rear cross member mounted on a lower part of a connection portion of the rear opening and the rear end module.