Thrust Reverser Linkage Gearbox for Offset Actuator Synchronization
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Solution Overview
Problem
Existing aircraft propulsion system actuation systems face challenges in space and packaging constraints, necessitating an improved thrust reverser actuation system that efficiently transfers torque between actuators while accommodating non-coaxial and offset linkage configurations.
Innovation Solution
The proposed solution involves a linkage system comprising a first and second linkage shaft, along with a gearbox, configured to transfer torque between actuators, including hydraulically or electrically driven actuators, with flexible couplings and lubricant flow passages, enabling efficient movement of thrust reverser components between stowed and deployed positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional coaxial linkage system is used, then the structure is simple, but it cannot accommodate offset actuator configurations and wastes space
Solution Approach 1:
A gearbox is introduced as an intermediary component between the first and second linkage shafts. The gearbox contains gears that mesh between the offset shafts, enabling torque transfer while accommodating the spatial offset. This mediator allows the system to handle non-coaxial actuator configurations without requiring complex universal joints or flexible couplings.
Solution Approach 2:
The linkage shafts are arranged in different planes rather than being confined to a single coaxial line. The first linkage shaft operates in a first plane while the second linkage shaft operates in a second plane offset from the first. This dimensional arrangement allows compact packaging of the actuation system while maintaining proper torque transfer paths.
2Area of stationary object
If offset linkage shafts are used to accommodate packaging constraints, then space efficiency improves, but torque transfer complexity increases
Solution Approach 1:
The gearbox serves as a compact intermediary mechanism that handles the torque transfer between offset shafts. By confining the complex gear meshing within a compact gearbox housing, the overall packaging area is minimized while still achieving the necessary torque transfer function between the non-coaxial linkage shafts.
Solution Approach 2:
Multiple functions are merged into the gearbox component: it serves as both the torque transfer mechanism and the spatial adapter for offset shafts. The gearbox housing also provides structural support and mounting points, consolidating several functions into a single integrated component that reduces overall system footprint.
3Volume of moving object
If non-coaxial linkage shafts are implemented, then space/packaging constraints are satisfied, but synchronization of actuator movement becomes more difficult
Solution Approach 1:
The gearbox acts as a synchronization intermediary by mechanically coupling the two linkage shafts through meshing gears. This positive mechanical connection ensures that rotational movements are transmitted reliably from one shaft to the other, maintaining synchronization of the actuators even though the shafts are offset and operate in different planes.
Solution Approach 2:
The gear meshing creates a kinematic relationship that equalizes the motion transmission between the offset shafts. By establishing a direct mechanical connection through the gears, the system ensures that both actuators experience equivalent motion constraints, preventing disproportional movement and maintaining synchronized operation.
Data Source
AI summary
An assembly is provided for an aircraft propulsion system. This assembly includes a first actuator, a second actuator and a linkage system. The linkage system is configured to transfer torque between the first actuator and the second actuator. The linkage system includes a first linkage shaft, a second linkage shaft and a gearbox. The first linkage shaft has a first centerline. The second linkage shaft has a second centerline offset from the first centerline. The gearbox is coupled to and is between the first linkage shaft and the second linkage shaft.