Vehicle Bracket Design for Rear Body Torsional Rigidity
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Solution Overview
Problem
The existing vehicle rear portion structure lacks sufficient torsional rigidity, leading to inadequate support for side members and cross members under load, which affects the stability and deformation of the rear body during acceleration and deceleration.
Innovation Solution
A vehicle rear portion structure featuring a pair of rear side members and a rear cross member with brackets that have inclined leg portions and fastening points, distributing the load vertically and longitudinally to suppress relative displacement and tilting, thereby enhancing torsional rigidity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the battery load is applied only to the vehicle transverse direction intermediate portion of the cross member, then the mounting structure is simple, but the torsional rigidity of the rear body is insufficient
Solution Approach 1:
The bracket is divided into multiple leg portions (first leg portion and second leg portion) that extend in different directions. The first leg portion connects to the cross member while the second leg portion connects to the side member, segmenting the load transmission paths to improve torsional rigidity without significantly increasing mounting complexity.
Solution Approach 2:
The bracket utilizes three-dimensional space by extending leg portions in multiple directions (transverse direction to cross member, longitudinal direction to side member). This spatial distribution of connection points enhances the structural rigidity of the rear body by engaging multiple dimensions of the vehicle framework.
2Force
If the first end surface and second end surface are inclined to resist longitudinal forces, then the resistance to acceleration/deceleration forces is improved, but the bracket deformation increases
Solution Approach 1:
The first end surface and second end surface are designed with asymmetric inclination angles relative to the longitudinal direction. This asymmetric geometry allows the bracket to effectively resist longitudinal forces during acceleration and deceleration while managing deformation through the strategic orientation of the inclined surfaces.
Solution Approach 2:
The inclination angles of the end surfaces are optimized parameters that balance force resistance and deformation control. By adjusting these geometric parameters, the bracket achieves adequate resistance to longitudinal inertial forces while maintaining acceptable deformation levels under dynamic loading conditions.
Data Source
AI summary
There is provided a vehicle rear portion structure that can improve torsional rigidity of a rear body that has side members and a cross member. A bracket has a top wall portion to which an HV (high voltage) battery is fixed. Further, the bracket has a first leg portion, that extends from a front end portion of the top wall portion toward a vehicle lower side and that is fixed to a first rear cross member, and a second leg portion, that extends from a vehicle transverse direction outer side end portion of the top wall portion toward the vehicle lower side and that is fixed to a rear side member.