Expanded Tube Vehicle Member for Rigidity and Vibration Damping
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Solution Overview
Problem
The rubber bulge coupling method for vehicle structural members can lead to a deterioration in flexural rigidity and vibration damping properties in the expanded tube portion.
Innovation Solution
A vehicle structural member configuration where the expanded tube portion is provided only between the first and second walls of the wall surface body, protected by the wall surface body, and joined by pressure welding to improve adhesion and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rubber bulge coupling is applied to join tube body and wall surface body, then joint strength is improved, but flexural rigidity and vibration damping properties deteriorate in the expanded tube portion
Solution Approach 1:
The tube body is divided into multiple expansion portions (first expanded tube portion and second expanded tube portion) that are separately expanded at different locations. This segmentation allows each expansion portion to independently contribute to joint strength while distributing the structural impact, preventing overall deterioration of flexural rigidity.
Solution Approach 2:
The tube body is selectively expanded only at specific portions where joints are needed, while other portions maintain their original non-expanded state with higher rigidity. This local expansion approach ensures that joint strength is improved at critical locations without compromising the overall flexural rigidity and vibration damping properties of the entire tube structure.
2Strength
If tube body is expanded radially outwardly to join with wall surface body, then adhesion is improved, but vibration damping properties deteriorate
Solution Approach 1:
Instead of expanding the entire tube body, only specific portions are expanded to the necessary degree for adequate adhesion. This partial expansion provides sufficient bonding strength at joint locations while minimizing the total volume of expanded material, thereby preserving vibration damping properties in the non-expanded portions of the tube.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the flexural rigidity and vibration damping properties of the expanded tube portion by shielding it from bending forces and vibrations, thereby improving the overall structural performance.
Implementation Method 1
compressing the elastic body in a tube axis direction of the tube body to bulge radially outwardly, thereby expanding the tube body
Implementation Method 2
the tube body is joined to the wall surface body by being pressure welded to the first through-hole and the second through-hole
Data Source
AI summary
A vehicle structural member 1 includes a tube body having an expanded tube portion that is partially expanded, and a wall surface body having a first wall provided with a first through-hole, a second wall provided with a second through-hole, and a connecting wall connecting the first wall and the second wall. The tube body is inserted through the first through-hole and the second through-hole, and is joined to the wall surface body by being pressure welded to the first through-hole and the second through-hole. The expanded tube portion is provided only between the first wall and the second wall.