Multi-Pivot ATV Suspension with Torsion Couplers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing all-terrain vehicles (ATVs) face challenges in traversing severe terrains due to limited suspension flexibility and inability to maintain a stable operator compartment over varied and rough surfaces.
Innovation Solution
A multi-pivot suspension system with multiple independent pivot points and torsion-controlled track assemblies that allow for independent longitudinal and transverse pivoting, coupled with elastomer shims and chamfered drive lugs to prevent derailment, enabling the vehicle to adapt to diverse obstacles while maintaining the operator compartment parallel to the ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-pivot suspension system is used, then the structure is simple, but the vehicle cannot adequately traverse severe terrains
Solution Approach 1:
The suspension system is divided into multiple independent pivot points (front pivot, rear pivot, and track pivots) that can move independently. Each pivot point handles specific terrain challenges, allowing the vehicle to navigate severe terrains while maintaining manageable structural complexity through modular design
Solution Approach 2:
The suspension system transitions from a static single-pivot design to a dynamic multi-pivot configuration where each pivot point can independently adjust its position and orientation. This dynamic adaptability allows the vehicle body to maintain stability while the suspension components actively respond to varying terrain conditions
2Adaptability or versatility
If the frame suspension is rigidly connected, then structural stability is maintained, but the vehicle cannot independently flex over obstacles
Solution Approach 1:
The rigid frame connection is segmented into multiple pivot joints that allow independent movement of suspension components. The front and rear suspensions can flex independently over obstacles while the vehicle body remains stable, achieving both adaptability and stability through strategic placement of pivot points
Solution Approach 2:
Different portions of the suspension system have different degrees of freedom and flexibility. The track assemblies and wheel hubs have localized flexibility to absorb impacts, while the vehicle body maintains overall stability. Each pivot point provides targeted flexibility where needed without compromising global structural integrity
3Adaptability or versatility
If track assemblies are fixed to the frame, then structural integrity is maintained, but the tracks cannot independently pivot to accommodate steering and terrain
Solution Approach 1:
The track assemblies are dynamically connected to the frame through pivot joints that allow independent rotation and movement. The tracks can pivot for steering maneuvers and adjust to terrain variations while maintaining secure attachment to the vehicle body, achieving both mobility and structural integrity
Solution Approach 2:
The pivot joints are pre-configured with appropriate clearances and mounting geometries that enable smooth pivoting motion before steering or terrain challenges occur. This preliminary design ensures that the tracks can immediately respond to steering inputs and terrain variations without compromising attachment strength
4Adaptability or versatility
If multiple pivot points are implemented, then terrain adaptability is improved, but the risk of derailment increases
Solution Approach 1:
The drive lugs are designed with localized chamfered edges at specific contact points with the track. This local geometric modification redistributes contact stresses and prevents the track from creeping upward along the lugs during pivot movements, thereby preventing derailment while maintaining terrain adaptability
Solution Approach 2:
The chamfered edges on the drive lugs provide a preventive geometric feature that cushions against the track lifting off during pivot movements. This design element anticipates potential derailment conditions and geometrically prevents them before they occur, maintaining reliability during dynamic suspension operation
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 multi-pivot suspension system enhances the vehicle's ability to traverse challenging terrains by allowing independent flexing of the frame and tracks, reducing the likelihood of derailment and maintaining a stable operator compartment, thereby improving the vehicle's overall performance and comfort.
Implementation Method 1
axles fitted to collars containing elastomer shims that resist and bias axle rotation to an equilibrium position
Implementation Method 2
Alternative multi-pivot frame suspensions, track assemblies and improved internal, track drive lugs are disclosed
Data Source
AI summary
An all terrain vehicle and suspension providing frame members that pivot relative to each other and independent of supported track assemblies. Suspension frame sections pivot at supported bearings and torsion couplers. An endless track of each track assembly is trained around a framework having a drive sprocket and sets of idler wheels. The track assemblies independently pivot relative to the vehicle from a track suspension frame and supported sets of idler wheels mounted to torsion biased rocker arms that resist and bias the rocker arms and idler wheels to an equilibrium position and conformally shape the track to the terrain. Improved track drive lug surfaces are shaped to prevent track derailment. The vehicle frame and track assemblies independently rise, fall and pivot as obstacles of differing configurations and types are encountered to stabilize and maintain an operator body substantially parallel to the ground.