Coupled Torsion Beam Axle Buckling Induction
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Solution Overview
Problem
Current coupled torsion beam axles, particularly those with tubular beams, fail to prevent damage or separation of wheel axles during vehicle accidents involving large lateral loads, leading to potential rollover due to high buckling strength, whereas beams with open structures may deform and allow wheel alignment but not provide sufficient support.
Innovation Solution
A coupled torsion beam axle design featuring a torsion beam with varying cross-sections and buckling induction members, including beads at the axle couplers, which induce controlled buckling deformation to prevent wheel separation and damage by bending the beam in a diagonal direction under lateral loads, thereby maintaining vehicle stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a tubular beam with closed section structure is used, then buckling strength is improved, but wheel separation and damage occur under large lateral loads
Solution Approach 1:
The torsion beam is designed with non-uniform cross-sections along its length, featuring larger cross-sections at end portions near wheels and smaller cross-sections at intermediate portions. This local variation in structural properties allows the beam to exhibit different mechanical characteristics at different locations, providing high buckling strength where needed while enabling controlled deformation to prevent wheel separation
Solution Approach 2:
The invention changes the geometric parameters of the torsion beam by varying the cross-sectional area along its length. The beam transitions from larger cross-sections at the ends to smaller cross-sections in the middle, creating intentional weak points that control the deformation pattern under lateral loads, thereby preventing catastrophic wheel separation while maintaining overall structural strength
2Weight of moving object
If a V-section or U-section beam with open structure is used, then weight is reduced, but buckling strength is insufficient under large lateral loads
Solution Approach 1:
The torsion beam employs varying cross-sections with larger areas at end portions and smaller areas at intermediate portions. This local quality variation allows the beam to achieve high buckling strength at critical locations (near wheels) while reducing overall weight through smaller cross-sections in non-critical intermediate regions
Solution Approach 2:
The invention combines different cross-sectional configurations along the beam length, creating a composite structural system that optimizes both weight and strength. The transition between larger and smaller cross-sections creates a graded structure that balances weight reduction with buckling resistance
3Ease of manufacture
If uniform cross-section beam is used, then manufacturing is simplified, but controlled buckling deformation cannot be achieved
Solution Approach 1:
The torsion beam features local variations in cross-sectional size, with larger sections at ends and smaller sections in the middle. This local differentiation creates predetermined weak points that control where buckling deformation occurs, ensuring deformation happens in safe zones away from wheel attachment points while maintaining manufacturing feasibility through standardized forming processes
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
The design effectively prevents wheel separation and damage, reducing the risk of rollover and maintaining vehicle travelability by creating local weak stiffness areas that allow controlled deformation, while maintaining high buckling strength and minimizing weight, thus addressing the limitations of both open and closed section beams.
Implementation Method 1
a buckling induction member configured to induce buckling deformation by an external load applied to each of the right and left axle couplers
Data Source
AI summary
A coupled torsion beam axle for buckling induction may include a torsion beam, a cross section of which varies laterally, a right axle coupler and a left axle coupler being respectively formed at both end portions of the torsion beam, the torsion beam being provided with a buckling induction member configured to induce buckling deformation by an external load applied to each of the right and left axle couplers.