Planter Row Unit Linkage Actuator Positioning
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Solution Overview
Problem
Agricultural implements such as planters face issues with row units positioning at undesirable angles relative to the underlying surface due to component arrangements in linkage assemblies, leading to inefficiencies in commodity distribution.
Innovation Solution
A linkage assembly with an actuator system that includes an upper arm and a lower arm, coupled to a toolbar and row unit via pivot points, allowing the actuator to retract and extend to adjust the row unit's position relative to the surface, with a design that enables parallel alignment of the arms and differential force application for enhanced stability and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the linkage assembly uses a conventional actuator configuration, then the structure is simpler, but the row unit positioning precision and alignment with the underlying surface deteriorate
Solution Approach 1:
The patent positions the actuator's second end at a fifth coupling point on the lower arm that is located between the second and fourth coupling points, creating a novel spatial arrangement. This dimensional repositioning allows the actuator to exert force at an optimal leverage point, improving row unit positioning precision while maintaining a manageable structural complexity through strategic placement rather than adding more components.
Solution Approach 2:
The linkage assembly allows the upper arm and lower arm to pivot dynamically relative to each other and the toolbar, enabling the row unit to adapt its position. The actuator dynamically adjusts the linkage configuration to maintain precise alignment, transforming a static structure into a dynamic system that can respond to varying operational conditions while achieving positioning precision.
2Force
If the actuator exerts greater force for extension, then the row unit can be lifted more effectively, but the stability and control during retraction deteriorate
Solution Approach 1:
The patent creates asymmetric force characteristics by positioning the actuator's second end at a specific location (fifth coupling point) on the lower arm between the second and fourth coupling points. This local configuration allows the actuator to exert greater force during extension for effective lifting, while the same geometric arrangement provides inherent stability and control during retraction, as each phase of actuator operation benefits from optimized force application at that specific location.
3Adaptability or versatility
If the row unit is allowed to pivot freely, then the adaptability to ground contours is improved, but the positioning accuracy and alignment deteriorate
Solution Approach 1:
The linkage assembly acts as a feedback mechanism that continuously adjusts the row unit's position. As the row unit pivots to adapt to ground contours, the changing geometry of the linkage (with the actuator connected at the fifth coupling point between the second and fourth coupling points) provides geometric feedback that maintains alignment precision. The actuator can sense and respond to position changes, automatically correcting deviations while preserving adaptability.
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 actuator system ensures precise alignment of row units with the underlying surface, maintaining consistent downforce and reducing pivoting movement, thereby improving commodity distribution efficiency and adaptability to ground contours.
Implementation Method 1
an actuator including a first end pivotably coupled to the row unit and the upper arm at the third coupling point and a second end pivotably coupled to the lower arm at a fifth coupling point located between the second coupling point and the fourth coupling point; wherein the actuator is configured to retract to urge the row unit downward relative to the underlying surface
Implementation Method 2
the actuator includes a cylinder and a piston positioned partially within the cylinder and configured to move relative to the cylinder during extension and retraction of the actuator
Data Source
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AI summary
A planter (13) for use in an agricultural operation is disclosed. The planter (13) comprising: a toolbar (12) supported above an underlying surface; a row unit (10) coupled to the toolbar (12) and configured to distribute commodity to the underlying surface; a linkage assembly (16, 116) including an upper arm (40) and a lower arm (42, 142) positioned below the upper arm (40), the upper arm (40) including a forward end (44) pivotably coupled to the toolbar (12) at a first coupling point (46) and a rearward end (48) pivotably coupled to the row unit (10) at a third coupling point (50), and the lower arm (42, 142) including a forward end (52) pivotably coupled to the toolbar (12) at a second coupling point (54) and a rearward end (56) pivotably coupled to the row unit (10) at a fourth coupling point (58); and an actuator (62, 162) including a first end (72) pivotably coupled to the row unit (10) and the upper arm (40) at the third coupling point (50) and a second end (74) pivotably coupled to the lower arm (42, 142) at a fifth coupling point (76) located between the second coupling point (54) and the fourth coupling point (58); wherein the actuator (62, 162) is configured to retract to urge the row unit (10) downward relative to the underlying surface.