Rear Subframe Assembly With Bilateral Symmetry for Lower Weight
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Solution Overview
Problem
Existing rear sub-frames in new energy vehicles are large in size and weight, with insufficient fixing structures, leading to reduced vehicle endurance and stability.
Innovation Solution
A rear sub-frame assembly with a bilateral symmetry structure, featuring multiple connecting parts and stabilizing rods, control arm mounting points, and a compact design to reduce weight and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the rear sub-frame is designed with a conventional structure, then it can provide basic support function, but it results in large external dimension and heavy weight
Solution Approach 1:
The rear sub-frame is divided into multiple modular components including left and right longitudinal beams, front and rear cross members, and positioning supports. This segmentation allows for optimized material distribution and weight reduction while maintaining structural integrity through modular assembly.
Solution Approach 2:
The sub-frame structure transitions from a conventional planar design to a three-dimensional spatial framework with longitudinal beams extending in the vehicle's length direction and cross members providing lateral connectivity. This dimensional enhancement improves structural efficiency and reduces weight by eliminating redundant materials.
2Stability of the object's composition
If the rear sub-frame is connected to the vehicle body with only four mounting points, then it simplifies the connection structure, but it reduces the lateral height and operational stability of the whole vehicle
Solution Approach 1:
The connection structure is segmented into multiple functional components: four primary mounting points for basic support, two positioning supports with positioning parts for lateral height adjustment, and multiple battery pack guard plate connecting parts for enhanced stability. This segmentation allows each component to perform its specific function optimally.
Solution Approach 2:
The connection system extends from a simple planar mounting arrangement to a multi-dimensional configuration involving vertical positioning supports, lateral cross members, and depth-wise battery pack guard plate connections. This multi-dimensional approach enhances operational stability without excessive complexity.
3Adaptability or versatility
If the rear sub-frame is designed with larger dimensions, then it can provide more mounting space, but it is not beneficial to whole vehicle endurance
Solution Approach 1:
The sub-frame utilizes three-dimensional space efficiently with longitudinal beams providing length-wise extension, cross members adding lateral dimension, and positioning supports utilizing vertical space. This multi-dimensional space utilization provides adequate mounting room without increasing overall footprint or weight.
Solution Approach 2:
Different regions of the sub-frame have optimized local properties: longitudinal beams provide structural strength along the vehicle length, cross members provide lateral rigidity where needed, and positioning supports provide localized adjustment capability. This local optimization ensures mounting space is provided only where required, minimizing unnecessary weight.
Data Source
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Figure 3~4
AI summary
The present disclosure relates to a rear sub-frame assembly, applied to an electric vehicle main body, and the rear sub-frame assembly comprises a rear sub-frame main body and positioning supports, wherein the rear sub-frame main body is a bilateral symmetry structure; vehicle body connecting parts connected with the rear sub-frame main body on an upper portion of the rear sub-frame main body, and battery pack guard plate connecting parts connected with the rear sub-frame main body on a lower portion of the rear sub-frame main body are constructed on the rear sub-frame main body, and stabilizing rod mounting parts, upper control arm mounting parts and lower control arm mounting parts are further arranged on the rear sub-frame main body respectively; and the quantity of the positioning supports respectively arranged close to a left end and a right end of the rear sub-frame main body is two, and positioning parts matched with external positioning members to position the rear sub-frame main body are constructed on the two positioning supports respectively. The rear sub-frame assembly of the present disclosure may be easy to form and compact in structure due to the symmetric structure, thereby reducing the size and weight of the rear sub-frame assembly, and it may have a good use effect.