Four-Bar GPS Module Mounting for Level Position on Harvester Covers
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Solution Overview
Problem
Existing agricultural harvesters face challenges in maintaining optimal GPS module positioning and signal reception during field operations with grain tank covers open and extensions deployed, as well as during road transport with covers closed and extensions retracted, particularly in northern latitudes and during harvesting operations.
Innovation Solution
A folding four-bar linkage mechanism with a ground link, coupler link, first crank link, and second crank link, along with an actuator, is used to maintain the GPS module in a horizontal position above the grain tank cover, adjusting its orientation based on the position of the grain tank cover and extensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GPS module is mounted on the grain tank cover, then the module can be positioned high for good satellite reception, but the module's horizontal position cannot be maintained when the cover is opened or closed
Solution Approach 1:
The mounting mechanism transitions from a static attachment to a dynamic four-bar linkage system that automatically adapts its configuration based on the grain tank cover position. The mechanism includes movable links and joints that allow the GPS module to maintain horizontal orientation while accommodating cover movement between open and closed states
Solution Approach 2:
The mechanism changes its geometric parameters (link angles, distances) in response to cover position changes. As the cover moves between open and closed positions, the four-bar linkage adjusts its configuration to keep the GPS module platform horizontal, effectively changing the mounting parameters dynamically rather than maintaining fixed parameters
2Adaptability or versatility
If the grain tank cover and extensions are moved between open and closed positions, then operational flexibility is improved, but the GPS module positioning becomes unstable
Solution Approach 1:
The mounting mechanism is designed as a dynamic system with movable links and joints that automatically adjust to maintain GPS module stability. The four-bar linkage configuration allows the mechanism to adapt its shape and orientation while keeping the module platform horizontal throughout the cover's range of motion
Solution Approach 2:
The mechanism creates an equipotential condition for the GPS module by maintaining it in a constant horizontal orientation regardless of cover position. The four-bar linkage is designed so that the module platform remains at a consistent angular level, effectively creating a stable reference plane amid changing operational configurations
3Device complexity
If a fixed mounting structure is used for the GPS module, then the structure is simple, but the module cannot maintain optimal horizontal position during cover movement
Solution Approach 1:
The solution replaces a simple fixed mounting with a dynamic four-bar linkage mechanism that uses controlled movement to maintain GPS module horizontality. The mechanism includes four links connected by joints, allowing the module to stay level while the cover moves, thereby improving reliability without excessive complexity
4Reliability
If the GPS module is positioned high above the combine, then satellite signal reception is improved, but the module is vulnerable to interference from combine parts during field operations
Solution Approach 1:
The mounting mechanism dynamically positions the GPS module to maintain both high elevation for signal reception and proper horizontal orientation to minimize interference. The four-bar linkage allows the module to stay elevated above the combine while keeping its platform level, reducing the impact of angled satellite signals and combine structure interference
Data Source
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AI summary
A mounting mechanism (400) for a signal-receiving module (1200) for an agricultural harvester (10) including a folding four-bar linkage (402) having a ground link (404) fixed to the folding cover (202) of a grain tank (28). The mechanism (400) holds the signal receiving module (1200) in a horizontal position at the highest position above the agricultural harvester (10) when the when the grain tank cover (202) is in the both the open (200) and closed (1400) positions. Also, a kit for mounting a signal-receiving module (1200) to a folding grain tank cover (202) on an agricultural harvester (10), a grain tank (28) for an agricultural harvester (10) including the mounting mechanism (400), and an agricultural harvester (10) including the mounting mechanism (400).