Bushing Mounting Structure for Hydraulic Down-Pressure Actuator
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Solution Overview
Problem
Conventional down-pressure systems for agricultural seeders, such as those using mechanical coil springs or hydraulic cylinders, often fail to maintain consistent downforce across varying field conditions, leading to inadequate seed depth and increased instances of 'hairpinning' where residue is not cut properly, resulting in reduced seed establishment and increased disease susceptibility.
Innovation Solution
A hydraulic down-pressure system with a mounting structure that includes a bushing and alignment member, featuring curved engagement surfaces to minimize bending stresses on the linear actuator, allowing for adjustable and uniform downforce application to opener assemblies, which can be retrofitted to existing implements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical coil spring is used for down-pressure, then the opener assembly can be raised and lowered, but the range of movement is limited and downforce consistency deteriorates in varying field conditions
Solution Approach 1:
The patent employs a hydraulic cylinder instead of a mechanical spring to provide dynamic downforce adjustment. The hydraulic system allows the opener arm to move through a greater range of motion while maintaining consistent downforce through fluid pressure control, resolving the contradiction between movement range and downforce consistency.
Solution Approach 2:
The invention changes the physical parameters of the down-pressure system by replacing the spring's elastic deformation mechanism with a hydraulic fluid pressure system. This allows for larger displacement ranges while maintaining force consistency through pressure regulation, addressing both the movement range and downforce consistency requirements.
2Force
If a hydraulic cylinder is used for down-pressure, then downforce can be adjusted, but bending stresses on the actuator increase
Solution Approach 1:
The patent introduces a mounting structure with a bushing as an intermediary component between the hydraulic cylinder and the opener arm. The bushing with its curved engagement surface acts as a mediator that redirects forces, allowing the hydraulic cylinder to apply downforce while minimizing bending stresses on the actuator through proper force vector alignment.
Solution Approach 2:
The mounting structure incorporates a curved engagement surface in the bushing that conforms to the cylindrical shape of the hydraulic rod. This curved geometry allows for optimal force transmission and reduces bending moments on the actuator by aligning the force vector with the rod's longitudinal axis, thereby reducing stress concentrations.
3Manufacturing precision
If more down-pressure is applied to compensate for spring relaxation, then seed depth can be maintained, but excessive force is applied to openers that do not need it
Solution Approach 1:
The hydraulic down-pressure system incorporates feedback mechanisms through pressure regulation and flow control valves that respond to the actual downforce requirements of each opener assembly. This allows the system to maintain consistent seed depth by adjusting downforce in real-time based on soil conditions and opener position, preventing excessive force application while ensuring adequate penetration.
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 solution provides a consistent and uniform downforce across a wider range of movement, reducing bending stresses on the actuator and improving seed depth consistency, thereby enhancing seed establishment and reducing residue-related issues.
Implementation Method 1
The protrusions have curved engagement surfaces for engaging a flat surface on the opener assembly to prevent bending stresses on the linear actuator
Implementation Method 2
A hydraulic down-pressure system with a mounting structure that includes a bushing and alignment member, featuring curved engagement surfaces to minimize bending stresses on the linear actuator, allowing for adjustable and uniform downforce application to opener assemblies
Data Source
AI summary
A down-pressure system for an agricultural implement has a linear actuator connected between a frame assembly and an opener assembly. A mounting structure for connecting the linear actuator to the opener assembly includes a bushing and an alignment member attached to the linear actuator. The bushing has protrusions extending transversely from opposite sides of a longitudinal axis of the linear actuator. Each protrusion has a curved engagement surface for engaging a flat surface on the opener assembly to prevent bending stresses on the linear actuator when the opener assembly is raised and lowered. The alignment member is arranged to lock the bushing into a predetermined rotational position about a longitudinal axis of the linear actuator relative to the opener assembly. The alignment member comprises a first structure that mates with a corresponding structure on the bushing, and a second structure that engages opposite sides of the opener assembly.