Rotor-Wing Assembly Locking Mechanism for Vibration Resistance

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Solution Overview

Problem

Existing rotor-wing assemblies in unmanned aerial vehicles (UAVs) face issues with propeller disengagement due to vibrations during flight, leading to propeller detachment from the motor, which affects normal flight operations.

Innovation Solution

A rotor-wing assembly that includes a motor, propeller, and a connection assembly with a locking member and a reinforcing member. The reinforcing member is engaged with the locking member to securely lock the propeller to the motor's rotating portion, preventing disengagement and ensuring stability during flight.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a locking member is used to connect the propeller to the motor, then the propeller can be easily locked and unlocked, but the locking member becomes disengaged due to vibration during flight

Engineering Contradiction:

Improveease of propeller assembly and disassemblyVSAvoidreliability of propeller connection

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The locking member is designed to rotate relative to the motor shaft, transitioning between a locked position (where it engages the propeller hub) and an unlocked position. This dynamic mechanism allows easy assembly/disassembly while maintaining secure connection during flight through the reinforcing member that prevents disengagement

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The reinforcing member is arranged between the locking member and the motor shaft, creating a nested structure where the reinforcing member supports the locking member from behind. This nested arrangement provides additional structural support to prevent the locking member from disengaging due to vibration, while maintaining the ease of operation

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the locking member is reinforced to prevent disengagement, then the connection reliability improves, but the device complexity increases

Engineering Contradiction:

Improvereliability of propeller connectionVSAvoidcomplexity of connection assembly

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The reinforcing member is integrated into the existing connection assembly between the locking member and motor shaft, rather than adding a separate external support structure. This merging approach provides additional reliability while minimizing the increase in device complexity by utilizing the existing spatial arrangement

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11524775B2Rotor-wing assembly and unmanned aerial vehicle

Publication Date: 2022.12.13 SZ DJI TECH CO LTD

AI summary

A rotor-wing assembly includes a motor, a propeller, and a connection assembly connecting the propeller to the motor. The motor includes a rotating portion. The connection assembly includes a locking member and a reinforcing member arranged between the propeller and the motor. The locking member locks the propeller to the rotating portion. A first end of the reinforcing member is mounted at the rotating portion. A second end of the reinforcing member opposite to the first end is engaged with the locking member, to reinforce the locking member to lock the propeller to the rotating portion.