Right-Angle Modular Actuator Layout for Heat-Isolated Stiffness
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Solution Overview
Problem
Rotational actuators in aerospace applications, such as hypersonic vehicles, face issues with increased backlash and loss of stiffness due to extended drivetrains, leading to inefficiencies and performance degradation under extreme heat conditions.
Innovation Solution
A compact modular actuator design featuring a right-angle gear drive with a co-planar arrangement of the motor output shaft, sun gear, and planetary gears, along with thermal isolation through air gaps and strategically placed position sensors, to maintain performance and efficiency under high-temperature and high-load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an extended drivetrain is used to position actuators away from the control surface, then the actuator avoids extreme heat, but backlash increases and stiffness is lost
Solution Approach 1:
The patent transitions from a linear drivetrain arrangement to a right-angle compact modular actuator configuration. The motor output shaft is positioned perpendicular to the control surface, with gears transmitting motion at 90 degrees, thereby achieving thermal isolation while maintaining drivetrain stiffness and minimizing backlash through the compact modular design
2Temperature
If an extended drivetrain is used to position actuators away from the control surface, then the actuator avoids extreme heat, but efficiency is lost
Solution Approach 1:
The patent integrates the motor, gear train, and support bearings into a single compact modular actuator unit. This merging of components eliminates the need for extended drivetrains and intermediate linkages, thereby reducing energy losses from additional mechanical interfaces while maintaining thermal isolation from the control surface
3Stability of the object's composition
If a compact modular actuator design is used, then stiffness and torque are enhanced, but volume must be reduced
Solution Approach 1:
The patent employs a nested gear configuration where planetary gears are positioned within the annular gear, and the motor output shaft passes through the central void. This nesting arrangement allows multiple gear stages to be compacted into a small volume while maintaining high stiffness through aligned gear meshes and concentrated load paths
Data Source
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AI summary
A gear drive, such as for an actuator, is a right-angle drive where toothed outer ridge of a face gear is coupled to teeth of a motor output shaft, and a set of planetary gears are engaged with a central sun gear of the face gear. The sun gear and planetary gears are aligned with the motor output shaft. For instance the motor output shaft may be substantially in the same plane with the sun gear and the planetary gears. From another standpoint the axis of the motor output shaft may intersect the sun gear, as well as intersecting a volume that the planetary gears sweep through as the planetary gears engage the sun gear.