Agricultural Caster Wheel Assembly Position-Dependent Locking Mechanism
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Solution Overview
Problem
Existing wheel assemblies for agricultural implements have complex locking systems that increase cost and complexity, making them inefficient for switching between planting and transport configurations.
Innovation Solution
A caster wheel assembly with a simplified locking mechanism, including a frame, sub-frame, connecting linkages, and a locking assembly with a lock lever and actuator, which allows for easy transition between locked and unlocked positions to facilitate planting and transport operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex linkage system is used for locking and unlocking wheels, then the wheel locking system can selectively lock and unlock the wheels, but the cost and complexity of the agricultural implement increases
Solution Approach 1:
The patent extracts the essential locking function from the complex linkage system and implements it through a simplified mechanism consisting of a lock lever with a locking element that directly engages with a locking structure on the wheel assembly. This removes unnecessary intermediate linkages while retaining the core locking capability.
Solution Approach 2:
The locking system is designed to automatically engage and disengage based on the position of the wheel assembly. When the wheel assembly is in the raised working position, the locking element automatically engages with the locking structure to lock the wheels. When the wheel assembly is lowered for transport, the locking element automatically disengages, eliminating the need for manual operation of complex linkages.
2Device complexity
If a simplified locking mechanism is used, then the cost and complexity of the agricultural implement is reduced, but the ability to selectively lock and unlock wheels may be compromised
Solution Approach 1:
The simplified locking mechanism automatically performs the locking and unlocking functions based on the wheel assembly position. The lock lever is positioned such that when the wheel assembly is raised, the locking element engages with the locking structure without requiring additional actuators or complex control systems, thereby maintaining reliability while reducing complexity.
Solution Approach 2:
The locking mechanism is designed to be dynamic rather than static, automatically adapting its state based on the wheel assembly position. The lock lever moves with the wheel assembly, ensuring that the locking element engages or disengages from the locking structure at the appropriate times, maintaining functional reliability through motion-driven operation.
3Force
If the wheel assemblies are locked during planting operations, then the row units can contact the soil with sufficient force, but the wheels cannot swivel which may affect maneuverability
Solution Approach 1:
The locking mechanism is designed to be position-dependent rather than fixed. The wheels are locked only when the wheel assembly is in the raised working position to provide sufficient soil contact force. When the wheel assembly is lowered for transport or turning maneuvers, the locking mechanism automatically releases, allowing the wheels to swivel and improving maneuverability during these operations.
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 assembly enables efficient switching between planting and transport configurations, reducing complexity and cost while allowing for sharper turns and improved maneuverability during transport.
Implementation Method 1
The locking element is configured to block rotation of the sub-frame relative to the frame while the locking element is engaged with the locking structure
Implementation Method 2
as the at least one connecting linkage moves the frame downwardly relative to the tool bar
Implementation Method 3
a sub-frame rotatably coupled to the frame
Data Source
AI summary
A caster wheel assembly includes a frame configured to pivotally couple to a tool bar, a sub-frame rotatably coupled to the frame, and a connecting linkage configured to control movement of the frame relative to the tool bar. The caster wheel assembly also includes a locking assembly, which includes a lock lever movably coupled to the frame, wherein the lock lever includes a locking element and a release element, a locking structure fixedly coupled to the sub-frame, and a driving element fixedly coupled to the connecting linkage. The locking element is configured to block rotation of the sub-frame relative to the frame while the locking element is engaged with the locking structure, and the driving element is configured to contact the release element as the connecting linkage moves the frame downwardly relative to the tool bar to drive the locking element to disengage the locking structure.