Vehicle Side Annular Frame Closed Cross Section Rigidity
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Solution Overview
Problem
The vehicle body structure disclosed in Patent Literature 1 may not efficiently improve torsional rigidity and vibration characteristics due to separate functioning of the third and fourth annular vehicle body frames against loads in the cabin space, leading to potential weight increase and vibration issues.
Innovation Solution
A vehicle body side structure featuring a side annular frame with a hinge pillar, front pillar, roof side rail, rear pillar, rear side member, and side sill, forming a closed cross section in the annular direction, which enhances rigidity and reduces weight by distributing loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two separate annular vehicle body frames (third and fourth frames) are disposed at the side portion of the cabin, then the vehicle body structure provides comprehensive load support, but the torsional rigidity improvement is inefficient and the vehicle body weight increases
Solution Approach 1:
The patent merges the third and fourth annular vehicle body frames into a single integrated side annular vehicle body frame. This unified frame structure efficiently improves torsional rigidity without the weight penalty of separate frames, as the integrated design allows for optimized load distribution and structural efficiency.
Solution Approach 2:
The side annular vehicle body frame is segmented into multiple functional components (hinge pillar, front pillar, roof side rail, rear pillar, rear side member, and side lower reinforcing member) that work together to provide comprehensive load support. This segmentation allows each component to be optimized for its specific load-bearing role while maintaining overall structural efficiency.
2Reliability
If two separate annular vehicle body frames are used at the side portion of the cabin, then load support is distributed, but the vibration characteristics of the vehicle body deteriorate
Solution Approach 1:
By merging the third and fourth annular frames into a single side annular frame, the patent creates a unified structural system that provides consistent load support while reducing vibration. The integrated design eliminates the potential for resonant interactions between separate frames and provides smoother load distribution that reduces harmful vibrations.
3Stability of the object's composition
If the side annular vehicle body frame is formed with a closed cross section at any position in the annularly extending direction, then the rigidity and anti-deformation capability are improved, but the manufacturing complexity increases
Solution Approach 1:
The side annular vehicle body frame is divided into discrete components (hinge pillar, front pillar, roof side rail, rear pillar, rear side member, and side lower reinforcing member) that can be manufactured separately and then assembled. This segmentation allows each component to be produced using standard manufacturing processes while the closed-cross-section design provides the required rigidity and anti-deformation capability.
Data Source
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AI summary
[Problem to be Solved] To provide a vehicle body side structure that can reduce an increase in vehicle body weight and improve vehicle body rigidity. [Solution] A vehicle body side structure having a door opening 10 includes a side annular vehicle body frame 70 having an annular shape, the side annular vehicle body frame 70 includes a hinge pillar 15 and a front pillar 16 that extend in an up-down direction at the front side of the door opening 10, a roof side rail 17 that extends rearward from an upper end of the front pillar 16 at the upper side of the door opening 10, a rear pillar 18 that extends downward from a rear end of the roof side rail 17 at a distance rearward from a rear peripheral edge portion 11c of the door opening 10, a rear side member 19 that extends forward from a lower end of the rear pillar 18 at a distance downward from a lower peripheral edge portion 11d of the door opening 10, and a side sill 20 that extends forward from a front end of the rear side member 19 at the lower side of the door opening 10, and a cross section perpendicular to an annularly extending direction of the side annular vehicle body frame 70 is formed as a closed cross section at any position.