Side Shaker Link for Harvester Sieve Assembly
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Solution Overview
Problem
Agricultural harvesters face high cyclical loads on the actuation mechanism for side-to-side movement of sieve assemblies due to the existing structural interconnections, leading to potential long-term integrity issues from high cycle fatigue.
Innovation Solution
A sieve assembly with right and left frame members interconnected by a cross member, featuring a cast link with a single input for driving side-to-side movement and multiple mounting points for structural frames, providing direct stress flow paths and enhanced structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single input point mechanism is used to drive side-to-side movement of sieve assembly frames, then device complexity is reduced, but high cyclical loads cause long term integrity issues due to high cycle fatigue
Solution Approach 1:
The link is segmented into multiple structural elements (first link element, second link element, third link element) connected through pinned connections. This segmentation distributes the cyclical loads across multiple connection points and structural components, reducing stress concentration at any single point while maintaining the simplicity of the single-input actuation mechanism.
2Ease of manufacture
If sheet metal links are used for structural interconnection, then ease of manufacture is improved, but high cycle fatigue reduces long term integrity
Solution Approach 1:
The link employs a composite structural design combining multiple materials: steel plates for the link elements, rubber bushings for damping and flexibility, and aluminum or other materials for mounting brackets. This composite approach provides both manufacturability and resistance to high cycle fatigue through material diversity and stress distribution.
Solution Approach 2:
Rubber bushings are incorporated as flexible elements within the link structure to provide damping, flexibility, and stress distribution. These flexible components absorb cyclical loads and prevent rigid stress concentrations, enhancing long-term integrity while maintaining ease of assembly and manufacture.
3Strength
If multiple mounting points are provided on the link, then structural integrity and load distribution are improved, but device complexity increases
Solution Approach 1:
Multiple mounting points and support functions are merged into a single integrated link structure. The first, second, and third link elements are interconnected to provide multiple mounting points (first mounting point, second mounting point, third mounting point) while functioning as a unified structural component, thereby providing enhanced structural integrity without proportionally increasing overall device complexity.
Data Source
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AI summary
An agricultural harvester (10) includes a grain processing section (26) having a sieve assembly (48). The sieve assembly (48) is connected to mechanism (110) for producing a side to side oscillation by a single cast structural link (128) having an input through slotted openings (156) to the drive mechanism (110) to accommodate misalignment. The link (128) has vertical and horizontal flanges (140, 142) connected to a main body (136) for interconnection between the right and left frames (72, 70) and structural supports (150, 152) interconnecting the right and left frames (72, 70). The main body (136) of the link (128) extends through a slot (160) in a rubber wall (158) to accommodate the movement and seal against loss of grain.