Torsion Beam Suspension Rigidity Adjustment
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Solution Overview
Problem
The existing torsion beam suspension systems experience abrupt changes in rigidity at the connection points between the trailing arms and the torsion beam, leading to stress concentration and a need for reinforcement.
Innovation Solution
The implementation of multiple rigidity adjustment portions positioned asymmetrically along the connection between the trailing arms and the torsion beam, allowing for a step-by-step change in rigidity and preventing abrupt changes, utilizing tailored blanks with varying plate thicknesses and materials to adjust the cross-sectional shape and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the trailing arm and torsion beam are connected with a merged shape, then the structure becomes simpler and manufacturing is easier, but the rigidity changes abruptly causing stress concentration
Solution Approach 1:
The patent applies local quality by introducing rigidity adjustment portions with different plate thicknesses at specific locations along the trailing arm. The plate thickness varies locally (first thickness in the width direction, second thickness in the longitudinal direction) to create gradual rigidity transitions only where needed, rather than uniformly throughout the entire structure. This resolves the contradiction by maintaining manufacturing simplicity while preventing abrupt rigidity changes through localized structural modifications.
2Strength
If reinforcement is added to the connection part, then the strength and rigidity are improved, but the device complexity and material usage increase
Solution Approach 1:
The patent merges the reinforcement function into the existing trailing arm structure by forming rigidity adjustment portions as integral parts of the upper member. Instead of adding separate reinforcement components, the varying plate thicknesses are incorporated directly into the trailing arm's monolithic structure, achieving strengthened connection parts without increasing device complexity or requiring additional parts.
Solution Approach 2:
The patent changes the geometric parameter of plate thickness to control rigidity distribution. By varying the plate thickness (first thickness vs. second thickness) in different regions, the structure achieves optimized strength characteristics without adding complex components. This parameter change approach allows precise control over rigidity while maintaining structural simplicity.
Data Source
Figure 1
Figure 2A~2B
Figure 3~4C
AI summary
[Problem] To provide a torsion beam suspension with which sudden changes in rigidity at a connection point between a trailing arm and a torsion beam can be prevented. [Solution] The present invention is a torsion beam suspension (100) in which a torsion beam (16), which extends in the left-right direction of a vehicle body, is joined to left and right trailing arms (50) that extend in the fore-aft direction of the vehicle body and oscillate vertically, said suspension being characterized in that at least two types of rigidity adjustment portions (15, 18, 24, 25), which adjust the rigidity from the trailing arms to the torsion beam, are disposed at staggered positions.