Multi-rotors UAV (unmanned aerial vehicle)

Abstract

The invention relates to a multi-rotors UAV (unmanned aerial vehicle) arm folding mechanism, which is characterized in that the arm folding mechanism is connected with an arm through an arm adapting piece (1), and the mechanism comprises an arm adapting piece (1), a spring (2), a sliding part (3), a locating part (4), a fixed part (5) and a pin shaft (6), wherein the arm adapting piece (1) is in a stepped shaft shape, the arm is fixed by a front part (11) of the arm adapting piece through a locking mechanism (111), a rear part (12) is smaller than the front part (11) in the outer diameter, the rear part (12) is internally provided with an internal thread (121), and the spring (2) sleeves the rear part (12); the lower half (32) of the sliding part (3) is internally provided with a fixed hole, the sliding part (3) sleeves the spring (2) through a through-hole, a hole end (311) of the through-hole is cooperated with the rear part (12) of the arm adapting piece (1); the locating part (4) enables the axial direction of the sliding part (3) to be limited by a convex plate (42); the arm folding mechanism is fixed on a rack by the fixing part (5).

Description

technical field [0001] The invention relates to the field of multi-rotor UAVs, in particular to a foldable multi-rotor UAV. Background technique [0002] A multi-rotor UAV is a special unmanned helicopter with three or more rotor shafts. It is rotated by electric motors on each shaft, driving the rotors, thereby generating lift. By changing the relative rotational speed between different rotors, the size of the single-axis propulsion can be changed, thereby controlling the trajectory of the aircraft. [0003] The motor is installed on the frame of the UAV through the arm. The arm is radially arranged relative to the fuselage. It is bulky and inconvenient to transport. At the same time, the arm structure is easy to collide during transportation, which affects the normal use of the UAV. [0004] At present, the folding structure of the drone arm is mostly fixed by bolts, which is inconvenient to disassemble, or fixed by buckles or pins. Due to structural limitations, there ...

AI Technical Summary

Problems solved by technology

[0003] The motor is installed on the frame of the UAV through the arm. The arm is set radially outward relative to the fuselage. It is bulky and inconvenient to transport. At the same time, the arm structure is easy to collide during transportation, which affects the normal use of the UAV.

[0004] At present, the folding structure of the drone arm is mostly fixed by bolts, which is inconvenient to disassemble, or fixed by buckles or pins.

Due to structural limitations, there will be a gap between the arm and the frame after deployment, or the strength of the pin shaft is limited, especially for some drones with a large load, the pin shaft deforms after a period of use to create a gap

When the motor is running at high speed, high-frequency vibration is generated, which makes the arm unstable and affects the service life of the drone

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