Segmented Girth Gear Flange Layout for Misalignment Relief
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Solution Overview
Problem
Conventional girth gears experience premature failure due to high stress concentrations at joint regions, misalignment, and inability to flex, leading to poor torque transmission efficiency and increased risk of pitting and fatigue.
Innovation Solution
A girth gear design featuring gear segments with flanges that are independent of the web, allowing for flexibility and self-alignment, with gaps between the flanges and the rim to accommodate misalignment and distribute loads evenly, reducing stress concentrations and enhancing torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the gear is made rigid with full penetration welds and gussets to support thrust loads, then the gear can transmit higher loads, but the gear cannot flex to accommodate misalignment leading to poor tooth contact and premature failure
Solution Approach 1:
The gear is divided into multiple segments that are bolted together using flanges, creating a modular structure. This segmentation allows each segment to flex independently while maintaining overall structural integrity, resolving the contradiction between rigidity for load transmission and flexibility for misalignment accommodation.
Solution Approach 2:
The flange connections are designed to be dynamically adjustable, allowing the gear segments to shift and self-align during operation. This dynamic capability enables the gear to accommodate misalignment while maintaining structural strength for load transmission.
2Stability of the object's composition
If the flange is fixed to both the rim and web by full penetration welds to eliminate movement and create high stiffness, then the joint region becomes highly rigid, but stress concentrations increase leading to frequent structural failure
Solution Approach 1:
The flange is extracted from the traditional configuration of being welded to both rim and web, and is instead fixed only to the web. This removal of the flange-rim connection eliminates the stress concentration point while maintaining sufficient joint rigidity through the web attachment alone.
Solution Approach 2:
The flange connection is designed with localized properties - fixed to the web for structural strength but spaced from the rim to allow local flexibility. This creates different mechanical properties in different regions of the joint, reducing overall stress concentration while maintaining necessary rigidity.
3Adaptability or versatility
If regions between gussets are left flexible to contrast with stiffened regions, then the gear can move, but cyclic loading and unloading cause inconsistent tooth contact leading to fatigue and wear
Solution Approach 1:
The gear is segmented into multiple sections with flanges positioned to create balanced flexibility throughout the structure. This segmentation distributes the flexibility evenly, preventing the cyclic loading issues that arise from localized flexible regions while maintaining the ability to accommodate misalignment.
Data Source
AI summary
A girth gear is provided, formed by a plurality of gear segments which are adapted to be secured together in an end to end arrangement to form the girth gear. Each gear segment includes a rim and a web extending from an underside of the rim. Each gear segment also includes at least one flange at each end of the gear segment for joining each gear segment together when the gear segments are in an end to end arrangement. The at least one flange has a side secured to one of the web or the rim.