Vehicle Side Sill Reinforcing Member Torsional Rigidity
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Solution Overview
Problem
Conventional vehicle body structures have insufficient rigidity against torsion due to concentrated stress at the joining portion between the side sill and wheel arch, leading to inadequate transmission of loads in the vehicle front-rear direction.
Innovation Solution
A vehicle body structure with a side sill extending in the front-rear direction, featuring a side sill inner member, a side sill reinforcing member outside the vehicle width direction at the rear, and a wheel arch member behind the side sill, where the reinforcing member is fixed to both the outer surface and front surface of the wheel arch member, enhancing structural connectivity and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the side sill reinforcing member is joined only to a joining portion on the outer surface of the wheel arch, then the structure is simple, but the rigidity against torsion is insufficient and stress concentrates on the joining portion
Solution Approach 1:
The side sill reinforcing member is fixed not only in the vehicle width direction (outer surface of wheel arch) but also in the vehicle front-rear direction (front surface of wheel arch). This adds a new fixing dimension, transforming a single-point connection into a multi-dimensional connection that distributes stress and improves torsional rigidity without significantly increasing structural complexity
2Ease of manufacture
If the side sill reinforcing member is joined only to a joining portion on the outer surface of the wheel arch, then the manufacturing process is simple, but stress concentrates on the joining portion reducing reliability
Solution Approach 1:
The fixing function is segmented into two independent fixing portions: a first fixing portion on the outer surface for width-direction fixation, and a second fixing portion on the front surface for front-rear direction fixation. This segmentation allows each portion to handle specific stress components independently, distributing load more evenly and improving reliability while maintaining manufacturing simplicity through modular assembly
Data Source
AI summary
An object of the present invention is to provide a vehicle body structure with improved rigidity of a vehicle body. The vehicle body structure includes a side sill extending in a vehicle front-rear direction and having at least a side sill inner member, a side sill reinforcing member disposed outside in a vehicle width direction of the side sill inner member at a rear portion of the side sill inner member, and a wheel arch member disposed behind the side sill, wherein the side sill reinforcing member includes a first fixing portion fixed to an outer surface of the wheel arch member from the outside in the vehicle width direction, and a second fixing portion fixed to a front surface of the wheel arch member from the front.