Vehicle Lower Structure for Side Collision Load Distribution
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Solution Overview
Problem
Existing vehicle structures fail to efficiently distribute side collision loads to cross members, leading to inadequate protection of the floor section during side collisions.
Innovation Solution
A vehicle lower structure featuring paired side sills and a frame member with specific configurations of first, second, and third portions that extend in the front-rear and vehicle width directions, allowing for efficient load distribution and transmission to opposite sides, including the use of ribs for enhanced rigidity and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cross members are arranged at regular intervals and connected directly to side sills, then the structure is simple and easy to manufacture, but side collision loads cannot be sufficiently transmitted to cross members and distributed to opposite sides
Solution Approach 1:
The frame member is divided into multiple portions (first portions extending in vehicle width direction, second portions extending outward, third portions extending along side sills). This segmentation allows the structure to handle loads from multiple directions more effectively, improving load transmission reliability while maintaining manufacturing simplicity through modular design
Solution Approach 2:
The frame member extends in multiple directions (vehicle width direction, outward direction, and along side sill direction) creating a three-dimensional load distribution network. This multi-directional extension enables efficient transmission of side collision loads to opposite sides while keeping the structure manufacturable
2Device complexity
If cross members are arranged at regular intervals, then the structure is simple, but the floor section cannot be protected sufficiently during side collision
Solution Approach 1:
The frame member is segmented into multiple functional portions that work together to protect the floor section. The first portions provide lateral support, the second portions extend outward to distribute loads, and the third portions connect to side sills for comprehensive protection, all while maintaining reasonable structural complexity
Solution Approach 2:
Different portions of the frame member have different configurations optimized for their specific functions. The first portions are positioned for lateral load bearing, the second portions extend outward for load distribution, and the third portions connect to side sills for structural integration, providing localized optimization for floor section protection
Data Source
AI summary
In vehicle lower structure includes paired side sills on both sides in a vehicle width direction of the floor section and extending in a front-rear direction, and a frame member. The frame member includes plural first portions, and plural second portions. The plural first portions are spaced apart from each other in a front-rear direction and each extend in a vehicle width direction. Each of the plural second portions is connected to an end portion of a respective first portion, extends outward in the vehicle width direction, and are arranged in the front-rear direction. The plural second portions have a total length in the front-rear direction of end portions on each of outer sides in the vehicle width direction is longer than a total length in the front-rear direction of the plural first portions.