Rear Subframe Structure with Load Transmission Members
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Solution Overview
Problem
The existing four-point support structure for the rear subframe in vehicles lacks sufficient rigidity and strength, leading to degradation in ride comfort and steering stability when the weight of parts mounted on the subframe increases, and results in higher overall vehicle weight and manufacturing costs.
Innovation Solution
A subframe structure comprising a pair of side frames extending longitudinally with bent portions, a vehicle body cross-member, load transmission members connecting the side frames and cross-members, and longitudinal members with specific attachment points to enhance rigidity and strength without increasing vehicle weight or manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a four-point support structure is used for the rear subframe, then the overall vehicle weight and manufacturing cost are kept low, but the rigidity and strength of the rear subframe are insufficient
Solution Approach 1:
The rear subframe support structure is segmented into multiple attachment points: four main attachment points at the corners and additional attachment points at bent portions of side frames. This segmentation distributes structural demands across multiple locations, enhancing overall rigidity and strength without requiring a complete redesign of the entire support structure.
Solution Approach 2:
The invention utilizes bent portions of the side frames that extend in multiple directions, adding spatial dimensionality to the attachment geometry. By attaching support members to these bent portions that extend laterally and longitudinally, the structure gains enhanced rigidity in multiple directions simultaneously, transforming a planar four-point support into a three-dimensionally reinforced structure.
2Adaptability or versatility
If the weight of parts mounted on the rear subframe is increased, then the functionality of the vehicle is improved, but the ride comfort and steering stability deteriorate due to insufficient subframe rigidity
Solution Approach 1:
The invention merges the structural functions of the side frames, cross-members, and support members into an integrated assembly. The bent portions of the side frames are joined with cross-members and support members to create a unified rigid structure that can handle increased mounting weights while maintaining vehicle stability, ride comfort, and steering precision.
Solution Approach 2:
The bent portions of the side frames are pre-formed with specific geometries that optimize load distribution before final assembly. These pre-bent sections are designed to align with cross-members and support members, creating rigid triangular and rectangular load paths that enhance structural stability in advance of any mounting operations or vehicle operation.
Data Source
AI summary
A subframe structure includes: right and left vehicle body side frames; a vehicle body cross-member extending in the vehicle width direction between the vehicle body side frames; a load transmission member connecting a portion of each vehicle body side frame that extends longitudinally frontward from a bent portion of the vehicle body side frame and a portion that is located laterally centrally relative to the laterally outer end portions of the vehicle body cross-member; right and left longitudinal members extending along the vehicle body side frames; and a front cross-member extending in the vehicle width direction between the longitudinal members. The front cross-member has a first attachment portion attached to each longitudinal member, an extension portion extending in the vehicle width direction from the first attachment portion, and a second attachment portion attached to the load transmission member at a laterally outer end portion of the extension portion.