Vehicle Rear Structure Load Path via Room Partition
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Solution Overview
Problem
Existing vehicle rear part structures lack an effective load transmission mechanism that maintains rigidity in the vehicle width direction, particularly in transmitting loads from rear wheels to structural components.
Innovation Solution
A vehicle rear part structure incorporating a rear cross member, under braces, rear suspension towers, and a room partition with specific coupling configurations and architectural features, such as a downward arch upper end and a closed sectional part, to efficiently transmit loads and enhance body strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional rear cross member and package cross member structure is used, then the vehicle width direction rigidity is maintained, but the load transmission from rear wheels is insufficient
Solution Approach 1:
The invention introduces a vertical dimension to load transmission by positioning the room partition above the rear cross member and under braces below it, creating a three-dimensional load path that vertically connects the rear suspension towers to the rear cross member, thereby improving load transmission capability without adding horizontal structural complexity
Solution Approach 2:
The room partition acts as an intermediary element that mediates load transmission between the rear suspension towers and the rear cross member. By coupling the room partition to both the suspension towers and the rear cross member, it efficiently transfers loads through this intermediate structure
2Strength
If reinforcing members are added to maintain rigidity, then body strength is improved, but the coupling bolt load increases
Solution Approach 1:
The invention segments the load transmission path into multiple components: rear suspension towers, room partition, under braces, and rear cross member. This segmentation distributes the coupling bolt loads across multiple connection points rather than concentrating them at single locations, thereby reducing the load on individual bolts while maintaining overall body strength
3Strength
If the room partition is coupled directly to the rear cross member from above, then load transmission is achieved, but the coupling position creates high stress concentration
Solution Approach 1:
The under braces serve as intermediary elements that are coupled to the rear cross member from below, positioned between the rear suspension towers and the rear cross member. This intermediary positioning distributes stresses more evenly across the rear cross member structure, reducing stress concentration at the coupling points while maintaining efficient load transmission
Data Source
AI summary
The present vehicle rear part structure includes: a rear cross member that extends in a vehicle width direction on a bottom of a vehicle, and is coupled to structural materials of both side parts of the vehicle; under braces that extend in the vehicle width direction, and couple the rear cross member, and the structural materials of both side parts of the vehicle; a pair of rear suspension towers that are provided in the both side parts of the vehicle, and support the pair of rear suspensions; and a room partition, having both ends in the vehicle width direction connected to the pair of rear suspension towers, and having an intermediate lower end in the vehicle width direction coupled to the rear cross member from an upper side. Coupling positions of the under braces and the rear cross member are below a coupling position of the room partition and the rear cross member.