Unmanned aerial vehicle and unmanned aerial vehicle body configured for unmanned aerial vehicle

Patent metadata

Field	Value
Publication number	US-2017327222-A1
Application number	US-201615523897-A
Country	US
Kind code	A1
Filing date	Jul 27, 2016
Priority date	Jul 31, 2015
Publication date	Nov 16, 2017
Grant date	—

Abstract

An unmanned aerial vehicle is provided and includes: an unmanned aerial vehicle body, including an airframe and an articles storing device; an arm, including at least two front arms symmetrically arranged with respect to a central axis of the airframe along a front-rear direction and at least two rear arms symmetrically arranged with respect to the central axis of the airframe; and a rotor-wing electric motor, including a front electric motor and a rear electric motor. A first end of the front arm is connected with a front end of the airframe, and a second end of the front arm is provided with the front electric motor to drive the unmanned aerial vehicle. A first end of the rear arm is connected with a rear end of the airframe, and a second end of the rear arm is provided with the rear electric motor to drive the unmanned aerial vehicle.

First claim

1 . An unmanned aerial vehicle, comprising:
an unmanned aerial vehicle body comprising an airframe and an articles storing device disposed behind the airframe and configured to store a variable weight part; an arm comprising at least two front arms symmetrically arranged with respect to a central axis of the airframe along a front-rear direction and at least two rear arms symmetrically arranged with respect to the central axis of the airframe; a rotor-wing electric motor comprising a front electric motor and a rear electric motor; wherein a first end of the front arm is connected with a front end of the airframe, and a second end of the front arm is provided with the front electric motor to drive the unmanned aerial vehicle; a first end of the rear arm is connected with a rear end of the airframe, and a second end of the rear arm is provided with the rear electric motor to drive the unmanned aerial vehicle; wherein an acting point of a resultant force from the front electric motor and the rear electric motor exerted on the unmanned aerial vehicle is the lift force center, and a gravity center of the unmanned aerial vehicle is adjacent to the lift force center, a projection of the lift force center on a horizontal plane is configured to be adjacent to a projection of a gravity center of the variable weight part on the horizontal plane.

2 . The unmanned aerial vehicle according to claim 1 , wherein the arm is formed to be a linear shape or an arc shape.

3 . The unmanned aerial vehicle according to claim 1 , wherein the arm is provided with an arm fixing piece and the arm fixing piece comprises:
a first fixing portion connected with the airframe; and a second fixing portion connected with the airframe, wherein the first fixing portion and the second fixing portion are connected and fitted with each other to define a mounting groove, the arm is disposed through the mounting groove, and the first fixing portion and the second fixing portion are separately provided with at least one outer flat surface connected with the airframe.

4 . The unmanned aerial vehicle according to claim 3 , wherein the arm is provided with an arm deflection locking hole, the first fixing portion and the second fixing portion are both provided with an arm deflection fixing hole in a position corresponding to the arm deflection locking hole.

5 . The unmanned aerial vehicle according to claim 3 , wherein the first fixing portion and the second fixing portion are separately provided with an arc inner surface configured to be matched with an outer wall of the arm.

6 . The unmanned aerial vehicle according to claim 3 , wherein the first fixing portion and the second fixing portion are provided with an arm fastening hole configured for bolted connection and an airframe connecting hole configured for bolted connection with the airframe.

7 . The unmanned aerial vehicle according to claim 1 , wherein a folding cavity body, an adaptor and a sprinkle-nozzle foldable rod are disposed below the arm, a driving assembly is disposed within the folding cavity body, a central portion of the adaptor is articulated within the folding cavity body, a front end of the adaptor is connected with the driving assembly, and a rear end of the adaptor passes through an opening of the folding cavity body and is fixedly connected with a first end of the sprinkle-nozzle foldable rod.

8 . The unmanned aerial vehicle according to claim 7 , wherein the driving assembly comprises a driving body, a driving shaft and a connection portion mounted within a casing, the driving shaft is configured to be rotatably connected with the driving body and the connection portion, and the driving body is used to drive the driving shaft to rotate so that the connection portion pushes the adaptor to rotate relative to the casing between a first position and a second position.

9 . The unmanned aerial vehicle according to claim 8 , wherein an outer wall of the driving shaft is provided with an outer thread, the connection portion is provided with a fitting hole, an inner wall of the fitting hole is provided with an inner thread, the driving shaft is configured to go through the connection portion, and the outer thread is configured to be fitted with the inner thread.

10 . The unmanned aerial vehicle according to claim 8 , wherein a first end of the driving shaft away from the driving body is provided with a thrust bearing, the thrust bearing is fixed within the casing, and the driving shaft is rotatably disposed through the thrust bearing.

11 . The unmanned aerial vehicle according to claim 8 , wherein the front end of the adaptor is formed to be a U-shaped groove and the connection portion is arranged within the U-shaped groove.

12 . The unmanned aerial vehicle according to claim 7 , wherein the unmanned aerial vehicle further comprises:
a control module used to control the driving assembly to drive the adaptor to rotate; and a current detection module, wherein the current detection module is used to detect whether a current of the driving assembly is larger than a preset threshold, and if the current of the driving assembly is larger than the preset thresholds, the current detection module is used to send a control signal for turning off the driving assembly to the control module; and the control module is used to turn off the driving assembly according to the control signal.

13 . The unmanned aerial vehicle according to claim 1 , wherein a heat dissipation waterproof cover is disposed to an upper end face of the rotor-wing electric motor, the heat dissipation waterproof cover comprises an upper sealing surface and a sidewall circumferential surface, the sidewall circumferential surface is provided with a certain number of ventilation holes adjacent to the upper sealing surface, and a blade distant from a center of the heat dissipation waterproof cover is disposed in the heat dissipation waterproof cover and extends from the ventilation hole towards a center of an inner wall of the upper sealing surface.

14 . The unmanned aerial vehicle according to claim 13 , wherein an annular cavity fitted with an air hole inside the rotor-wing electric motor is formed between the center of the inner wall of the upper sealing surface and the blade.

15 . The unmanned aerial vehicle according to claim 13 , wherein a height of a portion of blades adjacent to the center of the inner wall of the upper sealing surface is smaller than a height of another portion of blades adjacent to the ventilation hole.

16 . The unmanned aerial vehicle according to claim 1 , wherein the lift force center is adjacent to a gravity center of the articles storing device.

17 . The unmanned aerial vehicle according to claim 16 , wherein the gravity center of the unmanned aerial vehicle, the lift force center, and the gravity center of the articles storing device coincide.

18 . The unmanned aerial vehicle according to claim 16 , wherein two front arms and two rear arms are provided, an included angle between the two front arms is larger than an included angle between the two rear arms, and a length of the rear arm is larger than a length of the front arm.

19 . The unmanned aerial vehicle according to claim 1 , wherein a projection of an intersection region bounded by an extension line of the rear arm towards the airframe and an extension line of the front arm towards the airframe on the horizontal plane is located in front of a projection of a lift force center of the unmanned aerial vehicle on the horizontal plane.

20 .

Assignees

• Guangzhou Xaircraft Tech Co Ltd

Inventors

• He Jianbing
• Lin Zhiwen
• Jiang Pan
• Xiao Dingfeng
• Peng Bin

Classifications

• B64D1/18

  by spraying, e.g. insecticides · CPC title

• B64U50/19 Primary

  using electrically powered motors · CPC title

• B64C27/08

  with two or more rotors · CPC title

• B64C39/024 Primary

  of the remote controlled vehicle type, i.e. RPV · CPC title

• B64C2201/024

  Operations & Transport · mapped topic