Planter Suspension Shock Absorber Damping Bounce
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Solution Overview
Problem
Existing suspension systems for row crop planter units fail to adequately reduce row unit bounce, leading to improper seed spacing and seed depth due to uneven terrain, as coil springs do not sufficiently absorb vertical movements.
Innovation Solution
A coil-over shock absorber system is integrated into the parallel arm linkage of the row crop planter unit, featuring a fluid-filled shock absorber with a higher compression damping force than rebound damping force, ensuring better seed depth and spacing by controlling vertical movement and maintaining down pressure throughout the travel range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If coil springs are used to connect upper and lower parallel arms, then some down pressure is exerted on the planter unit, but row unit bounce is not sufficiently reduced
Solution Approach 1:
The patent replaces mechanical coil springs with a hydraulic shock absorber system that uses fluid pressure and valve-controlled flow to provide damping forces. The shock absorber contains a piston moving within a cylinder, with fluid passing through calibrated orifices and valves to create compression and rebound damping forces that actively control row unit bounce while maintaining down pressure on the planter unit.
Solution Approach 2:
The patent changes the physical parameters of the suspension system by introducing a shock absorber with adjustable damping coefficients. The compression damping coefficient and rebound damping coefficient can be independently tuned to optimize performance. The system also incorporates a preload adjustment mechanism that allows the down pressure parameter to be modified, enabling the suspension to maintain reliable bounce control across varying field conditions.
2Adaptability or versatility
If the planter unit is allowed to move vertically with parallel arm linkage, then the unit can adapt to uneven terrain, but seed spacing and seed depth become improper due to bounce
Solution Approach 1:
The shock absorber system provides passive feedback control where the damping forces automatically respond to the motion of the planter unit. During compression (upward bounce), the compression damping resistance opposes the motion. During rebound (downward movement), the rebound damping controls the descent rate. This feedback mechanism dampens oscillations and maintains seed placement precision while allowing the parallel arm linkage to accommodate terrain variations.
Solution Approach 2:
The shock absorber is pre-configured with compression and rebound damping characteristics that anticipate and counteract bounce forces before they affect seed placement. The coil spring component provides preliminary cushioning by maintaining constant down pressure on the planter unit, ensuring that the seeding equipment remains in firm contact with the ground even before encountering uneven terrain, thereby preemptively preventing seed spacing and depth errors.
3Force
If coil springs provide down pressure, then the planter unit maintains contact with terrain, but the damping force is insufficient to control upward bounce
Solution Approach 1:
The shock absorber employs hydraulic fluid and valve mechanisms to generate controllable damping forces. The compression damping circuit uses a piston with calibrated orifices and valves to create resistance against upward bounce motion. The rebound damping circuit similarly controls downward movement. This hydraulic system provides significantly higher and more controllable damping forces compared to passive coil springs, effectively suppressing harmful bounce while maintaining necessary down pressure through adjustable preload mechanisms.
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 coil-over shock absorber effectively reduces row unit bounce, maintaining consistent seed depth and spacing by allowing quicker downward movement and slower upward movement, thus improving planting precision and stability.
Implementation Method 1
The fluid in the compression chamber is compressed as the planter unit moves upwardly with respect to the toolbar
Implementation Method 2
the fluid in the rebound chamber of the shock absorber is compressed as the row unit moves downwardly with respect to the toolbar
Implementation Method 3
the damping force in the compression cycle is greater than the damping force in the rebound cycle
Data Source
AI summary
A suspension system for a row crop planter unit which includes a shock absorber extending between the planter unit mounting bracket and the parallel arm linkage which vertically mounts the planter unit to a toolbar. The shock absorber permits the planter unit to move more quickly in the rebound cycle than in the compression cycle to reduce row unit bounce.