Snap-Fit Propeller Hub Locking Against Shaft Detachment
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Solution Overview
Problem
Conventional propeller systems face issues with the hub becoming loosened and detaching from the driving shaft during sudden speed changes or vibrations, leading to potential propeller runaway, and require tools for disassembly after crashes.
Innovation Solution
A driving device with an elastic abutting member and a lock portion featuring snap-fitting mechanisms that securely connect the propeller to the driving shaft, allowing for easy disassembly and preventing detachment during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threaded close-fit is used to connect the hub and driving shaft, then the connection is strong during normal operation, but the connection becomes loose and detaches during sudden speed changes or vibrations
Solution Approach 1:
The patent applies the dynamics principle by using a snap-fit connection mechanism that can dynamically adapt to operational conditions. The elastic abutting member allows the connection to flex and maintain engagement during sudden speed changes and vibrations, transforming a static threaded connection into a dynamic one that responds to operational stresses without loosening.
Solution Approach 2:
The connection mechanism is segmented into distinct functional components: the snap-fit portion for primary engagement, the elastic abutting member for maintaining contact pressure, and the locking portion for securing the connection. This segmentation allows each component to perform its specific function optimally, preventing the hub from loosening during operation.
2Reliability
If threaded close-fit is used to connect the hub and driving shaft, then the connection is secure during startup and operation, but tool-based disassembly is required after crashes
Solution Approach 1:
The patent implements self-service by designing a connection mechanism that can be easily disassembled without specialized tools. The snap-fit connection allows the hub to be simply pulled off the driving shaft by hand, enabling quick removal and replacement of the propeller after crashes or maintenance needs.
3Reliability
If a lock mechanism with snap-fitting portions is added, then the hub prevents detachment during operation, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into a unified connection structure. The snap-fit portion, elastic abutting member, and locking portion are integrated into a single hub component that connects to the driving shaft, providing both secure attachment and easy disassembly without requiring separate complex mechanisms.
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
The solution provides a secure and easy-to-disassemble connection that prevents propeller detachment and runaway, ensuring reliable operation and facilitating tool-free disassembly post-crash.
Implementation Method 1
an elastic abutting member disposed on the body portion and used for abutting against the propeller
Data Source
AI summary
A propulsion system includes a driving device and a propeller coupled with the driving device. The driving device includes a body portion and a lock portion disposed on the body portion. The lock portion includes a first snap-fitting portion. The propeller includes a hub having a receiving hole, a plurality of blades connected to the hub, and a second snap-fitting portion arranged on an inner wall of the receiving hole and configured to snap with the first snap-fitting portion.