Hollow Stabilizer Bar Localized Cross-Section and Heat Treatment
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Solution Overview
Problem
Manufacturing a vehicle stabilizer with a hollow member for weight saving is challenging due to difficulties in changing the cross-sectional area and increasing manufacturing costs, especially when trying to achieve uniform principal stress.
Innovation Solution
A stabilizer design featuring a torsion portion with a first cross-sectional area, shoulder portions with a second larger cross-sectional area, and arm portions with the first cross-sectional area, along with a manufacturing method involving bending, preheating, and full heating of the shoulder and arm portions, allows for uniform principal stress distribution similar to solid members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the cross-sectional area of the stabilizer bar is changed to achieve uniform principal stress distribution, then the stress distribution is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The stabilizer bar employs different cross-sectional areas in different regions: a first cross-sectional area in the torsion portion and arm portions, and a second larger cross-sectional area in the shoulder portions. This local variation in geometry optimizes stress distribution by placing more material where stress concentrations occur (shoulder portions) while maintaining lighter weight in less stressed areas (torsion and arm portions).
Solution Approach 2:
The patent applies heat treatment parameters (heating temperature, heating time, cooling rate) to modify the material properties of the stabilizer bar. By controlling these thermal parameters during manufacturing, the bar achieves uniform principal stress distribution and optimized mechanical properties without requiring complex geometric variations throughout the entire structure.
2Strength
If the cross-sectional area of the stabilizer bar is changed to optimize stress distribution, then the structural performance is improved, but the manufacturing cost increases
Solution Approach 1:
The stabilizer bar employs different cross-sectional areas in different regions: a first cross-sectional area in the torsion portion and arm portions, and a second larger cross-sectional area in the shoulder portions. This local variation in geometry optimizes stress distribution by placing more material where stress concentrations occur (shoulder portions) while maintaining lighter weight in less stressed areas (torsion and arm portions).
Solution Approach 2:
The patent applies heat treatment parameters (heating temperature, heating time, cooling rate) to modify the material properties of the stabilizer bar. By controlling these thermal parameters during manufacturing, the bar achieves uniform principal stress distribution and optimized mechanical properties without requiring complex geometric variations throughout the entire structure.
3Weight of moving object
If a hollow member is used for weight saving, then the weight is reduced, but the design and manufacturing complexity increases
Solution Approach 1:
The hollow stabilizer bar employs different cross-sectional configurations in different regions. The shoulder portions have a larger cross-sectional area with optimized wall thickness to handle stress concentrations, while the torsion portion and arm portions maintain a smaller, simpler cross-section for weight reduction. This localized differentiation achieves weight savings while maintaining structural integrity.
Solution Approach 2:
The patent applies heat treatment parameters (heating temperature, heating time, cooling rate) to modify the material properties of the hollow stabilizer bar. By controlling these thermal parameters during manufacturing, the hollow structure achieves uniform principal stress distribution and optimized mechanical properties comparable to solid members, without requiring complex geometric variations throughout the entire structure.
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 design and manufacturing method simplify the production of stabilizers with hollow members, reducing weight and maintaining structural integrity while optimizing stress distribution, thus enhancing manufacturing efficiency and cost-effectiveness.
Implementation Method 1
preheating in a region including at least the shoulder portion, and fully heating the torsion portion, the shoulder portion, and the arm portion
Implementation Method 2
heat treatment requires complicated processes
Data Source
AI summary
A torsion portion extending in a vehicle width direction and having a first cross-sectional area, shoulder portions located at both ends of the torsion portion and having a second cross-sectional area larger than the first cross-sectional area and arm portions extending from the shoulder portions in a front and back direction of a vehicle, respectively and having the first cross-sectional area, so that even when a hollow member is used for weight saving, can be realized by design and manufacturing method facilitating making uniform principal stress as in a solid member.