Variable Rigidity Anti-Roll Bar for Vibration and Roll Control
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Solution Overview
Problem
Conventional anti-roll bar devices either fail to absorb vertical vibrations caused by bumpy terrain, leading to discomfort for motorists and passengers, or have fixed rigidity that is inadequate for cornering scenarios, increasing the risk of vehicle tilting and capsizing.
Innovation Solution
An anti-roll bar device with a variable rigidity system comprising a first and second arm assembly, a variable rigidity unit, and a bearing, where the variable rigidity unit changes its rigidity coefficient based on force thresholds, allowing for linear deformation at lower forces to absorb vibrations and nonlinear deformation at higher forces to manage cornering-induced torques effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional anti-roll bar device with fixed rigidity is used, then the vehicle body is stabilized during cornering, but the vehicle body shakes up and down on bumpy terrain causing discomfort
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a fixed rigidity anti-roll bar to a variable rigidity system. The rigidity of the anti-roll bar is made dynamically adjustable through a control system that modifies the mechanical properties of the bar based on detected vehicle conditions. This allows the system to adapt its characteristics in real-time, providing high rigidity during cornering for stability while reducing rigidity on bumpy terrain to minimize vertical vibrations and improve ride comfort.
Solution Approach 2:
The patent implements parameter changes by varying the rigidity parameter of the anti-roll bar based on operating conditions. A control system monitors vehicle state and adjusts the rigidity parameter accordingly - increasing rigidity when cornering forces are detected to prevent body roll, and decreasing rigidity when vertical vibrations occur on uneven surfaces. This dynamic parameter adjustment resolves the contradiction between maintaining stability and reducing vibration discomfort.
2Stability of the object's composition
If the anti-roll bar device has high rigidity to prevent tilting during cornering, then vehicle stability improves, but the device cannot absorb vertical vibrations from bumpy terrain
Solution Approach 1:
The system dynamically adjusts the anti-roll bar's rigidity based on detected vehicle conditions. During cornering, the control system increases rigidity to enhance anti-tilting capability and maintain vehicle stability. On bumpy terrain, the system reduces rigidity to allow the bar to flex and absorb vertical vibrations. This dynamic adaptation enables the single device to perform both functions effectively at different times.
Solution Approach 2:
The patent changes the rigidity parameter of the anti-roll bar according to operating conditions. The control system detects whether the vehicle is cornering or encountering bumps and adjusts the rigidity parameter accordingly. This parameter variation allows the anti-roll bar to provide high rigidity for anti-tilting when needed while maintaining the capability to absorb vertical vibrations when the road surface is uneven, thus resolving the contradiction between these two opposing requirements.
3Device complexity
If a fixed rigidity anti-roll bar is used, then the structure is simple, but it cannot adapt to different road conditions and cornering scenarios
Solution Approach 1:
The patent introduces dynamic adjustability to the anti-roll bar system, transforming it from a static, simple structure to a dynamic system that can adapt to different conditions. The control system monitors vehicle state and actively modifies the bar's rigidity in real-time, enabling adaptation to various road conditions and cornering scenarios while maintaining reasonable structural complexity through efficient control algorithms.
Solution Approach 2:
The system implements parameter changes by varying the rigidity of the anti-roll bar based on detected operating conditions. The control system adjusts the rigidity parameter dynamically - increasing it during cornering for enhanced stability and decreasing it on bumpy terrain for better vibration absorption. This parameter adaptability allows the device to respond effectively to different road conditions and driving scenarios while maintaining a relatively simple overall structure through intelligent control.
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 device effectively absorbs vertical vibrations on bumpy terrain and reduces tilting during cornering by adjusting its rigidity in response to force thresholds, enhancing ride comfort and safety by minimizing transfer of forces between suspension systems.
Implementation Method 1
the variable rigidity unit has a variable rigidity coefficient which is divided into a first deformed state and a second deformed state by a force threshold. When a force that the first arm assembly and the second arm assembly exert on the variable rigidity unit is smaller than the force threshold, the variable rigidity unit is in the first deformed state... When a force that the first arm assembly and the second arm assembly exert on the variable rigidity unit is larger than the force threshold, the variable rigidity unit is in the second deformed state
Data Source
AI summary
An anti-roll bar device with a variable rigidity has a first arm assembly having multiple first joining units, a second arm assembly having multiple second joining units, and a variable rigidity unit mounted between the first arm assembly and the second arm assembly and having multiple abutment portions and a variable rigidity coefficient. The first and second joining units are staggered with each other annularly and abut the abutment portions. When a vehicle passes a bumpy terrain, a slight force is exerted on the variable rigidity unit and is absorbed by the variable rigidity unit, such that the vehicle can be kept from tilting and shaking up and down. When the vehicle is in cornering, a larger force is exerted on the variable rigidity unit to increase a rigidity of the variable rigidity unit, such that the variable rigidity unit can transfer torques to keep the vehicle from tilting.