Epicyclic Gear Power Split for Aircraft Propulsion Mode Switching
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Solution Overview
Problem
Existing aircraft propulsion systems face challenges in efficiently distributing power between different rotors, particularly in switching between horizontal and vertical propulsion modes, which affects aircraft efficiency and handling during takeoff, landing, and hovering maneuvers.
Innovation Solution
The proposed solution involves an epicyclic gear system with a carrier, sun gear, ring gear, and intermediate gears, coupled with an electric machine and lock devices, allowing for selective power distribution between the first and second propulsor rotors by controlling the rotation of the ring gear and carrier, enabling efficient switching between propulsion modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional power distribution system is used for aircraft propulsion, then the structure is simple, but the ability to switch between horizontal and vertical propulsion modes is limited
Solution Approach 1:
The power distribution system is segmented into multiple independent gear trains, each capable of directing power to different propulsors. The first gear train can independently control power distribution to the first propulsor while the second gear train controls the second propulsor, enabling flexible mode switching without requiring a completely complex integrated system.
Solution Approach 2:
The gear system is designed with universal components that can serve multiple functions. The same gear train components can direct power to different propulsors depending on the operational mode, allowing the system to perform both horizontal and vertical propulsion functions using a unified mechanical architecture rather than separate dedicated systems.
2Ease of operation
If power is distributed to both propulsors simultaneously, then redundancy is provided, but control precision during mode transitions is reduced
Solution Approach 1:
The lockable member provides dynamic control over power distribution paths. During mode transitions, the lockable member can be selectively engaged or disengaged to redirect power flow from one propulsor to another, enabling precise control of the transition process while maintaining the ability to provide redundant power distribution when both propulsors operate simultaneously.
Solution Approach 2:
The lockable member acts as an intermediary mechanism between the power source and the two propulsors. It mediates the power distribution by selectively blocking or allowing power flow to each propulsor, thereby enabling controlled mode transitions while preserving redundancy capabilities when needed.
3Adaptability or versatility
If an epicyclic gear system with lockable members is used, then selective power distribution is achieved, but device complexity increases
Solution Approach 1:
The epicyclic gear system is segmented into multiple independent gear trains, each with its own lockable member. This segmentation allows selective engagement of specific gear trains to control power distribution to individual propulsors, achieving versatile control while keeping each segment's complexity manageable rather than requiring a single highly complex integrated system.
Data Source
AI summary
An assembly is provided for an aircraft. This aircraft assembly includes a carrier, a first gear system, a second gear system and an idler. The first gear system includes a first sun gear, a first ring gear and a plurality of first intermediate gears. Each of the first intermediate gears is between and is meshed with the first sun gear and the first ring gear. Each of the first intermediate gears is rotatably mounted to the carrier. The second gear system includes a second sun gear, a second ring gear and a plurality of second intermediate gears. Each of the second intermediate gears is between and is meshed with the second sun gear and the second ring gear. Each of the second intermediate gears is rotatably mounted to the carrier. The idler gear couples the first ring gear to the second ring gear.