Quarter-Rear Connecting Structure for Tailgate Rigidity
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Solution Overview
Problem
In electric vehicles, the increased size of the rear crossmember in the longitudinal direction for mounting components causes the chassis input load to be transferred to the tailgate opening, leading to reduced durability and torsional rigidity, and increased deformation of the tailgate opening.
Innovation Solution
A connecting structure between the quarter portion and the rear floor, comprising a back panel, a rear floor, a quarter rear outer member, and a side outer rear extension, which efficiently distributes chassis input load, increases torsional rigidity, and reduces tailgate opening deformation by extending the quarter rear outer member and side outer rear extension to the rear floor surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rear crossmember is increased in size in the longitudinal direction for mounting a motor and power electronics module, then the mounting capability is improved, but the chassis input load is transferred to the tailgate opening, reducing durability and increasing deformation
Solution Approach 1:
The rear crossmember is divided into a main body portion and an extended portion. The extended portion projects rearward beyond the main body to provide a separate mounting location for the power electronics module, allowing component distribution that prevents load concentration on the tailgate opening while maintaining mounting capability
Solution Approach 2:
The rear crossmember structure is extended in the longitudinal dimension by adding the extended portion that projects rearward. This dimensional extension creates additional mounting space without increasing the transverse size, thereby avoiding interference with the tailgate opening while maintaining component mounting capability
2Adaptability or versatility
If the rear crossmember is increased in size in the longitudinal direction, then the mounting capability is improved, but the torsional rigidity of the vehicle body is reduced
Solution Approach 1:
The rear crossmember is segmented into a main body portion and an extended portion, where each segment serves a specific function. The main body maintains structural rigidity while the extended portion provides mounting capability, thus preserving torsional rigidity while enabling component mounting
Solution Approach 2:
The extended portion of the rear crossmember is specifically designed with mounting features for the power electronics module, while the main body portion maintains the structural properties needed for torsional rigidity. This localized differentiation allows mounting capability to be added without compromising overall structural stability
3Adaptability or versatility
If the rear crossmember is increased in size in the longitudinal direction, then the mounting capability is improved, but the deformation of the tailgate opening is increased
Solution Approach 1:
The rear crossmember is segmented into a main body portion and an extended portion that projects rearward. This segmentation allows the mounting of components on the extended portion without increasing the transverse size of the main body, thereby preventing deformation of the tailgate opening while maintaining mounting capability
Solution Approach 2:
The solution extends the rear crossmember in the longitudinal dimension rather than increasing its transverse dimensions. The extended portion provides mounting space for the power electronics module without encroaching on the tailgate opening space, thus preventing deformation while maintaining adaptability
Data Source
AI summary
The present disclosure relates to a connecting structure between a quarter portion and a rear floor of a vehicle and, more specifically, to a connecting structure between a quarter and a rear floor, which can strengthen torsional rigidity of a vehicle body and secure durability of an opening of a tailgate.