Rear Cross Member T-Shape for Stabilizer Space and Rigidity
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Solution Overview
Problem
Existing rear subframe structures face challenges in increasing the closed section of the rear cross member for enhanced rigidity while maintaining space for a stabilizer without increasing the number of parts.
Innovation Solution
The rear subframe structure incorporates a rear cross member with a T-shaped closed sectional structure in a side view, where the size is increased in the vehicle front-rear direction, and a stabilizer support member is mounted between the lower-arm support portion and the upper-surface rear-side projection portion, connecting the upper and lower side members in an up-down direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the closed section of the rear cross member is increased to secure high rigidity, then the rigidity of the rear subframe is improved, but the space for installing a stabilizer becomes insufficient
Solution Approach 1:
The rear cross member is designed with a T-shaped closed sectional structure in side view, where the horizontal bar of the T-shape extends in the vehicle width direction and the vertical bar extends in the vehicle front-rear direction. This dimensional configuration increases the closed section area for rigidity while creating vertical space between the T-shape structure and the rear end of the upper side member for stabilizer installation.
Solution Approach 2:
The rear cross member is divided into functional segments: the T-shaped closed sectional structure provides rigidity, while the space above the T-shape structure is dedicated for stabilizer mounting. This segmentation allows independent optimization of rigidity and stabilizer space without compromising either function.
2Area of stationary object
If the number of parts is increased to provide both high rigidity and stabilizer space, then the rigidity and space requirements are met, but the device complexity increases
Solution Approach 1:
The rear cross member serves multiple functions: it provides structural rigidity through its T-shaped closed sectional structure, supports the upper side members, and creates mounting space for the stabilizer. This multi-functionality eliminates the need for separate reinforcement members or additional structural components, maintaining simplicity while achieving multiple objectives.
Solution Approach 2:
The stabilizer support function is merged into the rear cross member structure itself. The T-shaped configuration integrates the rigidity-providing closed section with the space-creating geometry, combining structural support and stabilizer mounting functions in a single component rather than requiring separate parts.
Data Source
AI summary
A rear subframe structure is provided with a rear subframe configured such that a front cross member, a rear cross member, a pair of left and right upper side members extending in a vehicle front-rear direction, and a pair of left and right lower side members extending in the vehicle front-rear direction are connected; and a vehicle-body mounting portion formed on each of both ends of the front cross member in the vehicle width direction, and on each of rear ends of the upper side members. The rear subframe further includes a lower-arm support portion formed on a lower lateral portion of the rear cross member, and a stabilizer support member for supporting a stabilizer. The rear cross member connects the upper side members and the lower side members in an up-down direction. The rear cross member includes an upper-surface rear-side projection portion projecting rearwardly. The stabilizer support member is mounted between the lower-arm support portion and the upper-surface rear-side projection portion of the rear cross member.