Spline Ring Flex Support for Gear Assembly Torque Transfer
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Solution Overview
Problem
Gas turbine engine manufacturers face challenges in balancing the functional requirements of speed reduction devices with cost and weight considerations, particularly in the fabrication of support structures for gear assemblies, which are costly and time-consuming.
Innovation Solution
A gear assembly support system utilizing a spline ring and flex support with attachment flanges, interference fits, and a torque reacting portion, allowing independent securing and torque transfer within the engine case, simplifying assembly and reducing machining complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a flexible support with torque transfer features is used to mate with corresponding features in the engine static structure, then torque transfer capability is improved, but manufacturing cost and fabrication time increase
Solution Approach 1:
The support structure is divided into multiple independent components: a flexible support element and a separate torque transfer feature. This segmentation allows each component to be manufactured independently using simpler, less costly processes while maintaining the overall torque transfer capability when assembled together.
Solution Approach 2:
A distinct torque transfer feature acts as an intermediary element between the flexible support and the engine static structure. This intermediary component enables torque transfer without requiring complex machining of the flexible support itself, thereby reducing fabrication complexity and cost.
2Reliability
If a complex support structure with integrated torque transfer features is fabricated, then functional performance is improved, but weight increases
Solution Approach 1:
By segmenting the support structure into separate functional elements (flexible support and torque transfer feature), each component can be optimized for its specific function with minimal material usage, reducing overall weight while maintaining functional performance.
Solution Approach 2:
The torque transfer feature is designed to perform multiple functions: transferring torque, providing structural support, and enabling assembly. This multi-functionality reduces the need for additional components, thereby reducing overall weight.
Data Source
AI summary
A gear assembly support for a gas turbine engine includes a spline ring configured to fit into a case of the gas turbine engine and a flex support. The flex support includes splines for engaging the spline ring and an inner portion attachable to a portion the gear assembly.