Seed Drill Scraper Wheel With Axial Tire Sealing
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Solution Overview
Problem
Conventional agricultural wheels with semi-hollow tires and scraper lips are inadequate for cleaning seed drill discs in clayey or sticky soils, as the scraper lip's flexibility leads to insufficient cleaning and premature deterioration, while rigid crowns cause soil accumulation and sealing issues.
Innovation Solution
An agricultural wheel design featuring a semi-hollow tire with a domed tread and radially inclined sidewalls, where the tire is mounted in an axially stressed state to create a sealing contact with an axial stop section, enhancing the sealing effectiveness and maintaining high deformation capacity for effective cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible scraper lip is used to clean seed drill discs, then the tire maintains high deformation capacity for cleaning, but the cleaning effect is insufficient in clayey or sticky soils and the lip deteriorates prematurely
Solution Approach 1:
The scraper function is segmented from the tire structure. A separate metallic scraper crown is attached to the wheel body, while the tire maintains its flexible semi-hollow structure for cleaning. This allows the tire to deform effectively without the scraper lip deteriorating, as the scraping function is performed by a separate, more durable component.
Solution Approach 2:
The patent introduces an intermediary metallic scraper crown between the tire and the seed drill disc. This intermediary component performs the scraping function that the flexible tire alone cannot achieve effectively, while the tire itself remains flexible for proper deformation and cleaning capacity.
2Reliability
If a rigid metallic crown is used instead of a flexible scraper lip, then cleaning effectiveness is significantly improved, but soil accumulates on the rim portion between the crown and tire requiring sealing
Solution Approach 1:
The scraping function is extracted from the tire structure and placed on a separate metallic crown attached to the wheel body. This allows the tire to remain flexible and deform properly, preventing soil accumulation in the interface between the tire and wheel body, while the separate crown performs scraping without causing sealing issues.
Solution Approach 2:
The patent makes the scraping component dynamic by allowing the flexible tire to deform and adapt to the working conditions while the metallic crown remains relatively fixed. This dynamic flexibility prevents soil accumulation that would occur with a completely rigid scraping structure.
3Strength
If the tire case is made harder to increase rigidity, then the structure becomes more durable, but the deformation capacity is reduced and cleaning effectiveness is lost
Solution Approach 1:
The patent uses a composite structure combining a flexible semi-hollow tire (elastomeric material) with a rigid metallic scraper crown. The tire portion maintains flexibility for deformation and cleaning, while the metallic crown provides the rigidity and durability needed for effective scraping, achieving both durability and adaptability through material composition.
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 wheel effectively seals and cleans the seed drill discs by maintaining tire deformation, preventing soil accumulation and improving the longevity of the wheel components.
Implementation Method 1
the tire being mounted on the seat section by means of the sheath in an axially stressed state which maintains the first sidewall in contact against the stop
Implementation Method 2
The tread has a profile domed towards the outside of the tire
Implementation Method 3
this first sidewall generally extending radially or slightly inclined radially
Data Source
AI summary
An agricultural wheel includes a body including a rim, and a semi-hollow-type tire including a flexible case including a sheath and a tread. The rim includes a seat section, suitable for receiving the tire, and a tool section, suitable for scraping the seed drill disc. The tread has a profile domed towards the outside of the tire. The case includes a first sidewall, close to the tool section, connecting the sheath to the tread. The sidewall extends radially or slightly inclined radially. The rim includes an intermediate axial section which connects the tool section to the seat section. The intermediate section is shaped as an axial stop for the tire which is form fitted with the first sidewall. The tire is mounted on the seat section by means of the sheath in an axially stressed state which maintains the first sidewall in contact against the stop.