Differential Gear Power Unit for Independent Nacelle Door Actuation
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Solution Overview
Problem
Existing electromechanical actuator systems for aircraft nacelle doors are costly, heavy, and inefficient in space usage due to the need for separate motors and controllers for each actuator, leading to increased weight and reduced reliability.
Innovation Solution
A geared rotary power distribution unit with mechanical differential gearing that allows a single unit to control multiple actuators, using differential gearing, electro-mechanical brakes, and an electronic control unit to selectively provide torque to individual actuators, reducing the need for multiple motors and controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate motors and controllers are used for each actuator, then each actuator can be independently controlled, but the system becomes costly, heavy, and space-consuming
Solution Approach 1:
The patent combines multiple actuator control functions into a single power distribution unit that houses one motor and one controller serving multiple actuators. This consolidation eliminates the need for separate motor-controller assemblies for each actuator, directly reducing system weight while maintaining independent control capability through the differential gearing mechanism.
Solution Approach 2:
The power distribution unit is designed as a universal device that can control multiple different actuators simultaneously. The single motor and controller in the PDU provide multi-functional capability to operate various actuators for different nacelle components (cowls, panels, doors), reducing the overall system complexity and weight compared to dedicated actuators for each component.
2Ease of operation
If separate motors and controllers are used for each actuator, then each actuator can be independently controlled, but the system takes valuable space in the turbine nacelle
Solution Approach 1:
The patent consolidates multiple actuator control functions into a single power distribution unit that houses one motor and one controller serving multiple actuators. This consolidation eliminates the need for separate motor-controller assemblies for each actuator, directly reducing system volume while maintaining independent control capability through the differential gearing mechanism.
Solution Approach 2:
The differential gearing mechanism allows nested functional relationships where a single motor output is distributed through gear sets to multiple actuators. The compact differential gear arrangement enables space-efficient nesting of control functions, allowing multiple actuator drives to be contained within a single PDU housing rather than requiring separate distributed assemblies.
3Reliability
If separate motors and controllers are used for each actuator, then reliability may be maintained, but the system becomes costly and complex
Solution Approach 1:
The patent merges multiple actuator control functions into a single integrated power distribution unit with one motor and one controller. This consolidation reduces the total number of electronic control units and motors required, simplifying the system architecture and reducing complexity while maintaining reliability through the robust mechanical differential gearing that provides inherent load distribution and fail-safe characteristics.
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
This solution reduces system weight, improves reliability, and conserves space by enabling a single power distribution unit to control multiple actuators, enhancing the efficiency and effectiveness of actuator systems.
Implementation Method 1
geared rotary power distribution unit with mechanical differential gearing for multiple actuator systems
Implementation Method 2
differential gearing arranged in a specific configuration combined with dual purpose electro-mechanical brakes
Implementation Method 3
dual purpose electro-mechanical brakes (grounding the legs of the differential(s) and holding the actuator open position)
Data Source
AI summary
Methods and systems for nacelle door electromechanical actuation may include a power distribution unit comprising a motor and differential gears; and a plurality of electromechanical actuators, each coupled to an output of a corresponding one of the differential gears. Each of the electromechanical actuators may include a configurable brake and a mechanical output, where the power distribution unit may provide mechanical torque to one of the electromechanical actuators via the motor and the differential gears based on configuration of the configurable brakes in each of the electromechanical actuators. At least one of the configurable brakes may be an electrically configurable brake. At least one of the configurable brakes may be a mechanically configurable brake. The differential gears may include two or more differential gears for receiving an input torque and supplying an output torque to one of a plurality of outputs of the differential gears.