Power Gearbox Oil Reservoir for Zero-G Lubrication
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Solution Overview
Problem
Gas turbine engine gearboxes face lubrication challenges during zero g-force events, where traditional lubrication systems fail to maintain adequate lubrication, leading to potential degradation of components due to insufficient lubrication flow.
Innovation Solution
A lubrication system comprising a rotating annular tank and injectors that utilize centrifugal forces to maintain lubrication flow to the gearbox components, even in zero g-force conditions, ensuring continuous lubrication through a network of injectors positioned to supply lubrication to planetary gears and plain bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional lubrication system is used in the gearbox, then the system is simple in structure, but lubrication flow is insufficient during zero g-force events leading to component degradation
Solution Approach 1:
The patent makes the oil tank rotate together with the gearbox components rather than keeping it stationary. This dynamic configuration allows the oil tank to maintain relative position with rotating components and utilize centrifugal forces during rotation to ensure continuous lubrication delivery even during zero g-force events, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The patent uses centrifugal force generated by rotation to counteract the effects of gravity on lubrication flow. During zero g-force events, the rotating oil tank generates artificial centrifugal acceleration that prevents lubrication deficiency, effectively using a counteracting force mechanism to maintain reliable lubrication delivery.
2Reliability
If the oil tank rotates with the gearbox components, then lubrication is maintained during zero g-force events, but the system complexity increases
Solution Approach 1:
The patent merges the oil tank with the rotating gearbox components, making them rotate together as an integrated system. This combination eliminates the need for separate stationary tank support structures and simplifies the overall mounting mechanism, partially offsetting the complexity added by the rotating configuration.
Solution Approach 2:
The rotating oil tank serves multiple functions: it stores lubrication, rotates with the gearbox components to maintain relative positioning, and generates centrifugal force to ensure lubrication flow during zero g-force events. This multi-functionality reduces the need for additional dedicated components, mitigating the complexity increase.
3Reliability
If centrifugal forces are used to maintain lubrication flow, then continuous lubrication is achieved during rotation, but the system requires precise rotational coupling
Solution Approach 1:
The patent segments the lubrication system into multiple injectors distributed around the rotating oil tank, each supplying lubrication to specific gearbox components. This segmentation allows each injector to be independently positioned and aligned, reducing the cumulative precision requirements compared to a single centralized lubrication point.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures continuous lubrication to the gearbox components during zero g-force events, preventing degradation and maintaining the operational integrity of the gearbox by using centrifugal forces to counteract gravity and ensure consistent lubrication delivery.
Implementation Method 1
A lubrication system comprising a rotating annular tank and injectors that utilize centrifugal forces to maintain lubrication flow to the gearbox components, even in zero g-force conditions
Data Source
AI summary
A gas turbine engine includes an engine core, a power gearbox, and a lubrication system. The engine core is configured to drive rotation of at least one shaft. The power gearbox is configured to transfer torque from the at least one shaft to other parts of the gas turbine engine. The lubrication system is configured to deliver lubrication to the power gearbox to reduce friction and cool rotating components within the power gearbox.