Partitioned Rotorcraft Gearbox Cooling for Single-Fan Failure
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Solution Overview
Problem
Current rotorcraft drive systems are prone to failures due to single component failures, loss of lubrication, and lack of redundancy, leading to reduced performance and safety issues, particularly in high-speed gearing and torque transmission.
Innovation Solution
A redundant cooling system with dual primary cooling pathways and fans, separate reduction gearboxes, and a shared cooling device with partitioned channels to ensure continued operation even if one fan fails, along with features like freewheeling clutches and self-contained gearboxes to minimize maintenance and lubrication-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single cooling pathway is used, then the device complexity is reduced, but the reliability deteriorates because the system cannot continue operation if the fan fails
Solution Approach 1:
The cooling system is segmented into multiple independent cooling pathways (first cooling pathway with first fan, second cooling pathway with second fan) that can operate independently. Each pathway has its own fan and airflow channel, allowing one pathway to continue cooling the gearbox if another fan fails, thus improving reliability without requiring a completely redundant complex system
2Reliability
If redundant cooling pathways are implemented, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Multiple cooling pathways are merged into a single integrated cooling device housing that services the gearbox. The first and second cooling pathways share common structural elements and the gearbox cooling function, allowing redundancy to be achieved while consolidating components into a unified system rather than completely separate redundant systems
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
Enhances the safety and reliability of rotorcraft drive systems by providing redundancy and minimizing the impact of component failures, ensuring continued torque transmission and operational capability during lubrication loss or fan failure scenarios.
Implementation Method 1
The fan is in fluid communication with the transition duct
Implementation Method 2
a shared cooling device for one or more systems or components
Data Source
AI summary
A cooling apparatus includes a shared cooling device for one or more systems or components, and a plurality of primary cooling pathways. Each of the primary cooling pathways includes a transition duct and a fan. The transition duct is in fluid communication with the shared cooling device. The fan is in fluid communication with the transition duct.