Marine Chain Sprocket with Segmented Radial Pockets
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Solution Overview
Problem
Existing marine-type chain driving sprockets used in agricultural machinery, such as planer scrapers, face issues with alignment, elongation, and fouling by slurry or manure, leading to derailing and increased maintenance needs.
Innovation Solution
A driving sprocket design featuring cylindrical recesses with lateral flanges and radially projecting forks that maintain chain engagement even when not perfectly aligned, twisted, or elongated, with flanges extending beyond the recess to accommodate chain variations and a secondary recess for improved link retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pocket sprocket is used to drive the marine chain, then the chain can be engaged and driven, but the chain and sprocket must be perfectly aligned or they will derail
Solution Approach 1:
The sprocket is segmented into multiple radial pockets that can independently receive chain links. This segmentation allows the chain to be engaged even when slightly misaligned, as individual pockets can accommodate links at varying angles, reducing the strict alignment requirement while maintaining reliable engagement.
Solution Approach 2:
Each radial pocket is designed with specific local geometry (cylindrical shape with flanges) that provides optimal engagement for chain links at different positions. The local quality of each pocket accommodates the varying orientations of chain links caused by misalignment, allowing reliable engagement without perfect alignment across the entire sprocket.
2Reliability
If a pocket sprocket is used to drive the marine chain, then the chain can be driven, but the chain links will relax and elongate over time causing the chain to come off and/or slip
Solution Approach 1:
The radial pockets are designed with sufficient depth and appropriate flange heights to accommodate chain elongation that occurs during service. The pockets provide a cushioning effect that maintains engagement even as chain links relax and lengthen over time, preventing the chain from coming off or slipping despite the duration of operation.
Solution Approach 2:
The sprocket design accommodates parameter changes in the chain, specifically the increase in link length due to relaxation. The pocket geometry and flange dimensions are selected to maintain effective engagement as the chain parameters change during its service life, extending the duration of reliable operation.
3Reliability
If a pocket sprocket is used to drive the marine chain, then the chain can be driven, but the pockets will be greased or obstructed by slurry and solid waste
Solution Approach 1:
The harmful effect of fouling is mitigated by designing the pockets with self-cleaning geometry. The radial configuration and flange design allow slurry and solid waste to be extracted or shed from the pocket surfaces during rotation, preventing accumulation that would interfere with chain engagement while maintaining reliable operation.
4Ease of manufacture
If the chain is insufficiently stretched, then the chain can be installed easily, but the chain will twist or jump from the sprocket
Solution Approach 1:
The radial pocket design provides dynamic adaptation to chain tension variations. Whether the chain is newly installed or has undergone some elongation, the pockets maintain effective engagement through their geometric design, allowing the system to accommodate varying chain states without twisting or jumping while maintaining installation ease.
Data Source
AI summary
A driving sprocket for a marine-type chain whose links have a section of diameter between 8 and 20 millimeters, intended to be used in the agricultural field. The sprocket includes a main cylindrical recess between two lateral flanges and a plurality of regularly spaced forks projecting radially from the recess, delineating housings intended for receiving every other link of the substantially flat chain. The flanges extend beyond the recess over a height substantially equal to the width of a link of the chain.