ARB Disconnect Geometry for Roll Gradient and Understeer Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional suspension systems face a tradeoff between off-road and on-road performance, where increased anti-roll bar stiffness reduces understeer gradient, making it difficult to achieve desired handling characteristics for both driving conditions.
Innovation Solution
A suspension system incorporating a motion transfer assembly with a drop link that provides an inversely proportional relationship between roll gradient and understeer gradient, using a unique geometry to increase understeer gradient with increased ARB stiffness, thereby improving yaw stability and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If anti-roll bar stiffness is increased to reduce roll gain and improve handling, then roll-stiffness is improved, but understeer gradient significantly decreases
Solution Approach 1:
The system segments the anti-roll bar functionality by providing both a connected mode (for high roll-stiffness on-road handling) and a disconnected mode (for high axle articulation off-road), allowing independent optimization of both characteristics through the disconnect assembly
Solution Approach 2:
The anti-roll bar system transitions from a static fixed-stiffness design to a dynamic system where the anti-roll bar can be selectively connected or disconnected based on driving conditions, enabling the vehicle to adapt between handling-oriented and off-road-oriented modes
2Stability of the object's composition
If anti-roll bar stiffness is increased for on-road handling, then roll gradient is reduced, but understeer gradient becomes too low affecting vehicle responsiveness
Solution Approach 1:
The system dynamically adjusts the anti-roll bar connectivity state based on driving conditions, being connected during on-road driving to optimize roll gradient and disconnected during off-road driving to maintain understeer gradient and vehicle responsiveness
3Adaptability or versatility
If ARB disconnect system is applied to independent front suspension, then axle articulation is improved, but understeer gradient is significantly reduced due to lower roll gradient
Solution Approach 1:
The disconnect assembly segments the anti-roll bar function, allowing it to be disengaged during off-road driving to maximize axle articulation while being engaged during on-road driving to maintain adequate understeer gradient and handling characteristics
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 system achieves improved responsiveness and handling capabilities for both off-road and on-road driving by increasing understeer gradient with higher ARB stiffness, enhancing driver confidence and vehicle performance.
Implementation Method 1
The drop link may operably couple the lower control arm and an anti-roll bar that includes a disconnect assembly to translate a roll motion into a force exerted on the lower control arm in a direction substantially parallel to the axis
Data Source
AI summary
A suspension assembly for a vehicle suspension system may include a lower control arm, an upper control arm, a damper, and a drop link. The lower control arm may be operably coupled to a chassis of a vehicle via a first bushing assembly and a second bushing assembly. The first and second bushing assemblies may each pivot about an axis substantially parallel to a longitudinal centerline of the vehicle. The upper control arm may be operably coupled to the chassis. The damper may be operably coupled to the lower control arm to dampen pivoting motion of the upper and lower control arms relative to the chassis. The drop link may operably couple the lower control arm and an anti-roll bar that includes a disconnect assembly to translate a roll motion into a force exerted on the lower control arm in a direction substantially parallel to the axis.