Planter Four-Bar Linkage for Transport Folding
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Solution Overview
Problem
Agricultural planters face challenges in efficiently raising and rotating row units for field turns and transport, requiring separate systems and components for height control, which increases complexity and costs.
Innovation Solution
A four-bar linkage system is implemented, where each wing section includes forward and aft bars with pivotally coupled arms, allowing for independent lifting and rotation of row units using shared lift components and hydraulics, enabling a low and narrow planter profile for transport while maintaining soil engagement during field operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate systems and components are used for height control during field operations and transport, then the planter can maintain soil engagement during planting, but the device complexity and costs increase
Solution Approach 1:
The patent implements a universal height control system where the same hydraulic lift components and four-bar linkage mechanism serve dual functions: controlling row unit height during field operations and elevating the planter frame during transport. This multi-functional approach eliminates the need for separate systems, reducing complexity while maintaining reliable soil engagement during planting and adequate clearance during transport
2Shape
If the planter wings are folded forward for transport, then a low and narrow profile is achieved, but the row units require substantial rotation and lifting capability
Solution Approach 1:
The patent merges the lifting and rotation functions into a single integrated four-bar linkage mechanism. The same lift components that control row unit height during planting are combined with the wing folding mechanism to simultaneously achieve both the low/narrow transport profile and the substantial row unit rotation required, eliminating the need for separate lifting and rotation systems
Solution Approach 2:
The four-bar linkage mechanism employs asymmetric arm configurations with different lengths and pivot positions to achieve the complex combined motion of lifting and rotating row units. The asymmetric geometry allows the mechanism to transform the vertical lifting motion into the combined vertical and rotational displacement needed for transport positioning
3Device complexity
If the same lift components are used for both field operations and transport, then design complexity is reduced, but the mechanism must handle varying positions and orientations
Solution Approach 1:
The patent implements a dynamic four-bar linkage mechanism where the arm lengths, pivot positions, and linkage geometry can be optimized to provide different motion characteristics depending on the operating mode. The same physical components adapt to different position and orientation requirements through their inherent mechanical flexibility and the ability to operate across a range of configurations, achieving both simplified design and versatile adaptability
Data Source
AI summary
An agricultural planter includes a frame and left and right wings pivotally attached to respective ends of the frame, all of which have a plurality of spaced row units. Each wing includes a forward bar pivotally coupled to the frame for forward folding for transport and an aft bar having row units attached thereto. Each aft bar is aligned parallel with and is pivotally coupled to its associated forward bar by at least one pair of first and second non-parallel coupling arms. A hydraulic cylinder coupled to the forward bar and to one of the pivoting arms raises the associated aft bar with row units above the soil to a first elevated position to facilitate turning the planter. Further extension of the hydraulic cylinder causes additional elevation, and substantial rotation of the aft bar and row unit combination to provide a low and narrow planter profile for transport and storage.