Caster Wheel Marker Assembly Reducing Scrub Loading
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Solution Overview
Problem
Agricultural seeders face issues with marker wheels scrubbing along the surface during deployment and travel, leading to undesirable loading and potential damage, especially when encountering obstructions or changing directions.
Innovation Solution
A marker assembly with a caster wheel mounted to a wheel mount connected to the frame, featuring a pivot arm and offset arm that allows the wheel to caster freely, reducing loading and enabling the wheel to roll smoothly during deployment and retraction, and pivot to avoid obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the marker wheel is designed to rotate during forward or reverse travel, then the marker assembly can be deployed and retracted, but the wheel will scrub along the surface during deployment and radius travel causing undesirable loading
Solution Approach 1:
The marker wheel assembly is made dynamically adjustable through a caster mechanism with pivot arms and offset arms that allow the wheel to change its orientation and rotation axis in response to deployment forces and surface conditions, transforming from a static fixed-wheel design to a dynamic adaptive system
Solution Approach 2:
The wheel mounting system adds an additional rotational dimension by allowing the wheel assembly to pivot laterally on a vertical axis through the caster mechanism, enabling the wheel to orient itself perpendicular to the direction of travel during deployment and return to parallel orientation during forward motion
2Ease of operation
If the marker wheel scrubs along the surface during deployment, then the wheel can engage the surface to push the marker assembly laterally, but this creates undesirable loading and potential damage to the wheel and components
Solution Approach 1:
The caster mechanism allows the wheel assembly to dynamically adjust its orientation, enabling smooth rolling motion during deployment rather than forced scrubbing, which reduces stress and prevents damage to the wheel and associated components
Solution Approach 2:
The pivot arms and offset arms are designed with sufficient clearance and rotational freedom to accommodate deployment forces before they can transmit damaging loads to the wheel or frame components, effectively cushioning against shock loads
3Device complexity
If the marker wheel is fixed to the frame, then the structure is simple, but the wheel cannot adapt to surface contours or changes in travel direction without scrubbing
Solution Approach 1:
The wheel mounting structure incorporates multiple pivot points and offset arms that enable the wheel to adapt its position and orientation in response to surface contours and changes in travel direction, providing dynamic adaptability while maintaining structural integrity
Solution Approach 2:
The wheel assembly is segmented into multiple independently movable components including the wheel itself, offset arms, and pivot arms, allowing each segment to move and adjust independently to accommodate varying operational conditions
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 caster wheel design reduces loading on the marker assembly and prevents damage by allowing the wheel to roll and pivot, ensuring smooth operation and effective deployment/retraction without surface scrubbing, even when encountering obstacles or changing directions.
Implementation Method 1
The wheel has an axle to which a pivot arm is connected. The pivot arm is in turn connected to an offset arm that is secured to the wheel mount by a vertical pivot pin. The offset arm is mounted to the pivot pin in a manner that allows the offset arm to caster freely about the vertical axis defined by the pivot pin.
Implementation Method 2
This movement of the offset arm in turn allows the wheel to caster. This is particularly advantageous when the wheel encounters an obstruction to avoid damage to wheel or other components of the marker assembly. This construction also allows the wheel to caster to a position at which the wheel rolls along the ground during deployment or retraction of the marker assembly.
Data Source
AI summary
A marker assembly for use with an agricultural implement includes a marker wheel that may caster as needed to reduce loading of the marker assembly during deployment of the marker assembly, in response to variations in surface contour, and in response to changes in travel direction of the agricultural implement.