UAV Propeller Assembly Elastic Detachment Mechanism
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Solution Overview
Problem
Existing unmanned aerial vehicles (UAVs) with foldable propellers face issues such as economic waste due to non-disassemblable configurations, requiring separate tools for assembly and disassembly, and potential loosening of fasteners under rotational forces, leading to damage and inefficiency in component replacement.
Innovation Solution
A UAV design featuring a propeller assembly with a hub structure, elastic connection members, and a cap system that allows for easy detachment and reattachment of blades, enabling single-component replacement and improved storage and mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hub and propeller are provided in a configuration that cannot be disassembled through press-fitting, bonding, or the like, then structural integrity is improved, but economic waste occurs due to replacement of all components when some components are damaged
Solution Approach 1:
The propeller assembly is divided into separable components: the hub structure and the blade. The blade can be detached from the hub structure through the connection member mechanism, allowing only the damaged blade to be replaced rather than the entire propeller assembly. This segmentation enables selective replacement of components while maintaining structural integrity during operation.
2Ease of repair
If a foldable unmanned aerial vehicle is provided in a configuration that can be disassembled using screws, bolts, nuts, or the like, then ease of repair is improved, but device complexity increases due to requirement of separate tools for fastening and disassembly
Solution Approach 1:
The connection member incorporates an elastic post that can be manually pressed to release the blade from the hub structure without requiring external tools. The elastic deformation of the post provides the necessary force to disengage the blade, enabling users to perform maintenance and blade replacement directly without needing screwdrivers, bolts, or other fastening tools.
3Ease of operation
If fixing by fastening is not properly followed, then ease of operation is improved, but reliability deteriorates due to fastening loosening by force and vibration acting when the blade rotates
Solution Approach 1:
The connection member uses a cylindrical post with a circular cross-section that fits into a corresponding circular opening. This circular geometry provides uniform contact around the entire perimeter, distributing the forces from blade rotation and vibration evenly. The circular shape prevents the fastening from loosening under rotational forces while maintaining simple assembly through straightforward insertion.
4Reliability
If screws are repeatedly tightened, then reliability is improved, but manufacturing precision deteriorates due to thread damage on the hub
Solution Approach 1:
The invention extracts the threaded connection mechanism and replaces it with a friction-based elastic retention system. The elastic post deforms to engage with the opening, creating a secure connection without threads. This eliminates the wear and damage that would occur from repeatedly tightening and loosening screws, preserving the manufacturing precision of the hub structure.
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 design facilitates easy replacement of damaged blades, reduces waste, and enhances the UAV's portability and operational efficiency by allowing for easy folding and unfolding of propellers without the need for specialized tools.
Implementation Method 1
a first connection member protruding from the surface in a first direction perpendicular to the surface, the first connection member including a first post and a second post extending parallel to the first post and spaced apart from the first post, the first post and the second post being elastically movable in a second direction perpendicular to the first direction
Data Source
AI summary
An example unmanned aerial vehicle includes a housing; a wireless communication module; a plurality of propulsion systems; and a navigation circuit. At least one of the plurality of propulsion systems includes a motor; and a propeller assembly rotatably connected to the motor. The propeller assembly comprises: a hub structure including a surface facing away from the motor; a first connecting member including a first post and a second post extending in parallel to and spaced apart from the first post, and the first post and the second post are fixed to the surface and are able to move elastically in a second direction perpendicular to the first direction; a first blade detachably coupled to the first connecting member and comprising an opening to which the first post and the second post are coupled; and a cap detachably coupled to the top of the first connecting member.