Vehicle Lower Structure With Local Reinforcement for Rigidity
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Solution Overview
Problem
Existing vehicle lower structures face challenges in ensuring rigidity while minimizing weight increase.
Innovation Solution
A vehicle lower structure design incorporating a pair of vehicle body frame members, intermediate members, and reinforcing members that cooperate to receive loads, with specific support regions defined by reference lines, and the use of less expensive cushion members and reduced adhesive usage to minimize weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing members are provided throughout the intermediate member to ensure rigidity, then the rigidity of the vehicle lower structure is improved, but the weight of the vehicle lower structure increases
Solution Approach 1:
The reinforcing member is strategically positioned only in specific regions where load bearing is necessary (front side relative to seat front end, between reference lines), rather than uniformly throughout the entire intermediate member. This localized reinforcement maintains rigidity where needed while reducing overall weight.
Solution Approach 2:
Instead of providing full reinforcement across the entire intermediate member, the invention applies partial reinforcement only in the critical load-bearing region. This partial action is sufficient to ensure adequate rigidity while minimizing weight increase.
2Stability of the object's composition
If intermediate members are used to fill spaces in the lower frame, then the structural integrity is improved, but the device complexity increases
Solution Approach 1:
The intermediate member integrates multiple functions: it fills the space within the lower frame, provides load-bearing support, and works cooperatively with the reinforcing member. This merging of functions into a single component reduces overall structural complexity while maintaining integrity.
Solution Approach 2:
The intermediate member serves multiple purposes simultaneously: structural filling, load distribution, and cooperation with reinforcing elements. This multi-functionality reduces the need for separate components, thereby reducing device complexity.
Data Source
AI summary
A vehicle lower structure includes a pair of vehicle body frame members, an intermediate member at least a portion of which is disposed between the pair of vehicle body frame members, a power storage device disposed below the intermediate member, a seat disposed above the intermediate member, and a reinforcing member disposed inside the intermediate member or on an upper surface of the intermediate member, wherein the vehicle lower structure has a region in which the reinforcing member is not provided below the seat in a vehicle up/down direction.