Reversible Offset Pivot Wheel Hub for Irrigation Gearbox Alignment
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Solution Overview
Problem
Existing agricultural irrigation pivot wheels struggle to accommodate drive discs with different linear offset distances from their respective gearboxes, leading to compatibility issues and inefficient operation.
Innovation Solution
A rotationally molded pivot wheel with a reversible offset wheel hub assembly that can be mounted to either of two gearboxes with different linear offset distances, utilizing a top-hat shaped portion and doubler plate for secure attachment to drive discs, allowing flexible alignment and securement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed hub assembly is used in the wheel, then the wheel structure is simple and manufacturing is easier, but the wheel cannot accommodate drive discs with different linear offset distances
Solution Approach 1:
The hub assembly is made reversible and interchangeable, allowing it to be dynamically reconfigured between different offset positions. The hub can be removed from one wheel side and reinstalled on the other side to change the offset configuration, transforming a static structure into a dynamically adaptable one.
Solution Approach 2:
The hub assembly is designed as a separate, modular component that can be independently removed and reinstalled. This segmentation allows the hub to be detached from the wheel and repositioned on the opposite side, enabling adaptation to different offset requirements without redesigning the entire wheel structure.
2Adaptability or versatility
If the hub assembly is made reversible and interchangeable between wheel sides, then adaptability to different offset configurations is improved, but the complexity of installation and operation increases
Solution Approach 1:
The hub assembly incorporates asymmetric features including a keyed bore with a keyway that matches a corresponding key in the wheel, and an asymmetric pattern of mounting holes on the drive disc. These asymmetric elements ensure proper orientation and simplify installation by providing mechanical guidance, reducing the operational complexity despite the reversible design.
Solution Approach 2:
The hub assembly includes self-aligning features such as the keyed bore and keyway system, along with a doubler plate that provides a stable mounting surface. These features enable the hub to self-align and secure itself during installation without requiring complex alignment procedures or specialized tools, maintaining ease of operation.
3Reliability
If a doubler plate is added to the hub assembly for secure attachment, then the strength and reliability of the connection is improved, but the manufacturing complexity increases
Solution Approach 1:
The doubler plate is merged with the hub assembly as an integrated component, with mounting holes that align with both the wheel and the drive disc. This combination creates a single structural element that simultaneously provides reinforcement and mounting functionality, enhancing reliability without requiring separate manufacturing processes for the plate and hub.
Solution Approach 2:
The doubler plate serves multiple functions: it reinforces the hub assembly structure, provides a stable mounting surface for the drive disc, and incorporates alignment features for accurate positioning. This multi-functionality consolidates several requirements into a single component, simplifying the overall manufacturing process while maintaining high reliability.
Data Source
AI summary
A molded irrigation pivot wheel rotationally molded from a linear low-density polyethylene resin that has a reversible offset wheel hub assembly mounted in a central transverse core of the wheel for attaching to a selected drive disc of an attached pivot line gearbox. The invention is particularly useful having a reversible offset wheel hub assembly that can be mounted to one or the other of two gearboxes where each gearbox having a different linear offset distance to its drive disc.