Walk-behind tractor driveshaft for increased ground clearance
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Solution Overview
Problem
Conventional walk-behind tractors have a fixed ground clearance, which can limit their ability to navigate through tall plants, as the clearance height is not adjustable and may not accommodate plants that grow to varying heights.
Innovation Solution
The design incorporates a driveshaft positioned above the wheel axis, with stub axles and a looped mechanism to increase ground clearance, allowing taller plants to pass beneath the tractor, and the ability to adjust the wheelbase width for different terrain conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fixed axle design is used, then the structure is simple and easy to manufacture, but the ground clearance cannot be adjusted for different plant heights
Solution Approach 1:
The patent applies the dynamics principle by making the axle system adjustable rather than fixed. The first and second axles can be positioned at different heights relative to the ground, allowing the ground clearance to be dynamically changed according to plant height requirements. This is achieved through adjustable mounting mechanisms that enable operators to modify the axle positions while maintaining structural integrity.
Solution Approach 2:
The patent segments the axle system into separate first and second axles that can be independently positioned. Rather than a single fixed axle, the drivetrain is divided into multiple axial components that can be adjusted relative to each other, enabling flexible ground clearance configuration while maintaining the overall structural framework.
2Adaptability or versatility
If the driveshaft is positioned at standard height, then the structural design is conventional and simple, but taller plants cannot pass beneath the tractor
Solution Approach 1:
The driveshaft is designed with adjustable positioning capabilities, allowing its height to be modified according to the height of plants being operated in. The driveshaft can be positioned at different vertical levels while maintaining proper mechanical connection to the axles, enabling operators to accommodate various plant heights without compromising the drivetrain's functional effectiveness.
3Length of moving object
If a higher driveshaft position is used, then ground clearance is increased for tall plants, but the mechanical connection to wheels becomes more complex
Solution Approach 1:
The patent applies local quality by providing different axial positions for different portions of the drivetrain. The first and second axles are positioned at different heights to create the necessary ground clearance, while the driveshaft connects to them at appropriately positioned locations. This localized differentiation in axial positioning allows high ground clearance without requiring the entire drivetrain to be reconfigured.
Data Source
AI summary
A walk-behind tractor has an increased ground clearance to define a plant receiving space that has a greater height than a conventional walk-behind tractor having a straight axle. The walk-behind tractor has trailing drop arms from a frame that carry wheel axles that result in an elevated height of a driveshaft. The elevated driveshaft increases the ground clearance for taller plants to pass therebeneath during operation of the walk-behind tractor which would otherwise be too tall to pass below a conventional straight axle walk-behind tractor.