Vehicle Side Stiffener Design for Collision Load Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle body substructures with battery packs below the floor panel struggle to efficiently transmit collision loads to the inner side of the vehicle body during side collisions, requiring improved load absorption and transmission mechanisms.
Innovation Solution
A substructure design featuring a side sill with an outer stiffener having a nearly hat-shaped cross section bulging outward and an inner stiffener bulging inward, where the inner stiffener's first side surface is positioned above the outer stiffener's second side surface, supported by a lower surface of the side sill, allowing efficient load transmission and battery pack support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional stiffener configuration is used in the side sill, then the structure is simple, but the collision load cannot be efficiently transmitted to the inner side of the vehicle body
Solution Approach 1:
The stiffener is divided into multiple segments including an outer stiffener and an inner stiffener positioned at different heights. This segmentation allows each segment to independently contribute to load transmission while maintaining structural simplicity, resolving the contradiction between efficient load transmission and configuration complexity
Solution Approach 2:
The invention introduces a vertical dimension to the stiffener configuration by positioning the inner stiffener higher than the outer stiffener. This dimensional change enables more effective load transmission paths without significantly increasing horizontal complexity, addressing the contradiction between load transmission efficiency and structural simplicity
2Strength
If the stiffener is positioned to optimize load transmission, then collision load transmission improves, but the battery pack support may be compromised
Solution Approach 1:
By segmenting the stiffener into outer and inner components at different vertical levels, the structure can independently optimize for both collision load transmission (through the staggered configuration) and battery pack support (through the overall side sill structure), eliminating the trade-off between these two functions
Solution Approach 2:
The stiffener configuration exhibits local quality variations with the inner stiffener positioned higher than the outer stiffener. This localized structural differentiation enables optimized load transmission paths in the collision zone while maintaining adequate support characteristics for the battery pack, resolving the contradiction between these two functional requirements
Data Source
AI summary
A side sill structure included in a substructure of a vehicle body, includes a battery pack disposed below a floor panel, a side sill disposed at an outer part in a vehicle width direction and extending in a front-rear direction of the vehicle body, and a stiffener disposed inside a cross section of the side sill and extending along an extending direction of the side sill. The stiffener is composed of an outer stiffener bulging outward in the vehicle width direction, and an inner stiffener bulging inward in the vehicle width direction. In the side sill structure, a first side surface of the stiffener, formed on the inner stiffener, is shifted to a relatively upper side than a second side surface of the stiffener, formed on the outer stiffener, and the battery pack is supported on a lower surface of the side sill.