Unmanned aerial vehicle tail crane structure

Abstract

The utility model discloses an unmanned aerial vehicle tail crane structure which comprises a tail crane body, the rear end of the tail crane body is connected with a thrust unit, the tail crane body comprises a framework, the outer portion of the framework is connected with a skin in a supporting mode, the rear end of the framework is provided with a motor base, and the motor base is connected with the skin. The structure is light in weight, the connecting position of the motor base flanging and the skin is designed to be of an independent local structure, the connecting position without a fastener is removed, and the structure weight is saved; meanwhile, the skin and the framework are both made of carbon fiber composite materials, and the weight of the structure is reduced; the motor base is provided with the air duct holes for heat dissipation of the thrust unit motor, heat dissipation can be directly conducted on the motor, and the heat dissipation effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of unmanned aerial vehicles (UAVs), and in particular to a tail hanging structure for an UAV. Background Art

[0002] A drone is an unmanned aerial vehicle controlled by a radio remote control device and a self-contained program control device. It is characterized by small size, low cost and easy use. Drone + industry application is the real demand for drones; its application in aerial photography, agriculture, plant protection, micro selfies, express transportation, disaster relief, wildlife observation, infectious disease monitoring, surveying and mapping, news reporting, power inspection, disaster relief, film and television shooting, creating romance and other fields has greatly expanded the use of drones themselves.

[0003] Many drones currently use a composite wing structure for vertical takeoff and landing, with a pull unit arranged at the front or a thrust unit arranged at the rear. These are used during fixed-wing level flight to provide horizontal pull or thrust for the drone during forward flight. A thrust unit is installed at the rear of the tail-mounted structure to provide thrust. Depending on the overall layout plan, it is arranged at the rear of the fuselage or at the fusion area between the rear of the strut and the rear of the tail wing. It is generally designed with motor connectors and tail wing frames, skins and other structures to provide support and force. However, existing tail-mounted structures, such as the Chinese utility model patent "A UAV" with application number 201921673138.2, have the tail motor installed on the tail thruster at the rear of the fuselage. The design of the tail thruster is not optimized enough. At the same time, this connection form is effective for structures where the motor is arranged at the rear of the fuselage, and is not suitable for the installation and connection of tail thruster motors arranged in other locations. Utility Model Content

[0004] The present invention aims to provide a tail-hanging structure for an unmanned aerial vehicle (UAV) to address the problems mentioned in the background art. To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a tail-hanging structure for an UAV, comprising a tail-hanging body, the rear end of which is connected to a thrust unit, the tail-hanging body comprising a frame, the external support of which is connected to a skin, a motor mount provided at the rear end of the frame, and the motor mount connected to the skin.

[0005] Preferably, a tube beam through hole is provided on the right side of the skin, and there are two tube beam through holes. A lock fixing seat is provided between the two tube beam through holes, and the lock fixing seat is a sunken structure to form an installation plane.

[0006] Preferably, the skeleton includes a crossbeam, a plurality of crossbeams are provided and connected by longitudinal beams, both ends of the crossbeam are connected with butt ribs, a tube beam is connected between the two butt ribs, and the tube beam passes through and connects the longitudinal beams.

[0007] Preferably, the motor seat is provided with a plurality of flanges along the periphery, the flanges are connected to the skin, and the motor seat is provided with air duct holes and motor connection holes.

[0008] Preferably, the air duct hole is a strip-shaped hole, and a plurality of the air duct holes are provided and evenly distributed along the upper end of the motor base.

[0009] Preferably, a tube beam fixing hole is opened on the butt joint rib, and two tube beam fixing holes are provided. The tube beam fixing holes connect the tube beams, and a lock reinforcement plate is provided between the two tube beam fixing holes.

[0010] The technical effects and advantages of the utility model are as follows: the structure is light in weight: the connection position between the motor base flange and the skin is designed as an independent local structure, and the connection position without fasteners is removed, saving structural weight; at the same time, the skin and the frame are made of carbon fiber composite materials, reducing the weight of the structure;

[0011] Good heat dissipation: The motor base is designed with air duct holes for heat dissipation of the thrust unit motor, which can directly dissipate heat from the motor and has a good heat dissipation effect;

[0012] High safety: The frame adopts a double longitudinal beam and three transverse beam structure, which effectively improves the safety of the structure;

[0013] Easy to maintain: The tail suspension structure adopts a tubular beam plug-in structure between the horizontal tail and vertical tail. The outer shape of the tubular beam of the vertical tail and horizontal tail is the same as the inner diameter of the tubular beam of the suspension, which is convenient for plug-in. Then a lock fixing seat is designed on the skin. Open the lock and directly pull out the tubular beam of the horizontal tail and vertical tail to complete the structural analysis, which is convenient for separate maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an axonometric drawing of the present utility model;

[0015] Figure 2 It is an exploded view of the utility model;

[0016] Figure 3 This is an axonometric drawing of the skin of the utility model;

[0017] Figure 4 It is an axonometric drawing of the skeleton of the utility model;

[0018] Figure 5 This is an axonometric drawing of the motor base of the utility model;

[0019] Figure 6 This is an axonometric drawing of the docking rib of the present invention;

[0020] Figure 7 This is an axonometric drawing of the utility model assembled with a drone.

[0021] In the figure, 1. Tail crane structure; 11. Tail crane body; 111. Frame; 1111. Motor seat; 11111. Flanged edge; 11112. Air duct hole; 11113. Motor connection hole; 1112. Docking rib; 11121. Tube beam connection hole; 11122. Lock reinforcement plate; 1113. Longitudinal beam; 1114. Cross beam; 1115. Tube beam; 112. Skin; 1121. Tube beam through hole; 1122. Lock fixing seat; 12. Thrust unit; 2. UAV. DETAILED DESCRIPTION

[0022] In order to make the technical means for realizing the present invention, the creative features, the purpose and the effect easily understood, the present invention is further explained below in conjunction with specific diagrams. In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, an integral connection or a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two components.

[0023] Example

[0024] like Figure 7 As shown, the tail suspension structure 1 is arranged at the location where the inner support rod, horizontal tail, vertical tail and thrust unit of the UAV 2 converge. In addition to the loads of the horizontal tail and vertical tail, it is also subject to the thrust, vibration, gyroscopic load, etc. of the thrust unit. The structure is subjected to complex forces and needs to be designed with a more reliable structure to meet the strength requirements.

[0025] like Figure 1 and Figure 2 As shown, the tail-mounted structure 1 comprises a tail-mounted body 11 and a thrust unit 12. The rear end of the tail-mounted body 11 is connected to the thrust unit 12. The motor drives the propeller, which in turn provides forward thrust to the drone 2. The tail-mounted body 11 connects the inner struts, vertical tail, horizontal tail, and thrust unit, bearing the loads of these structures and components, ensuring structural integrity and strength.

[0026] The tail pendant body 11 includes a skeleton 111 and a skin 112. The skeleton 111 is externally supported and connected to the skin 112. The skin 112 and the skeleton 111 are both made of carbon fiber composite materials to reduce the structural weight. The skeleton 111 supports the skin 112. The skin 112 bears the aerodynamic force of the UAV 2 during flight and the thrust of the thrust unit 12, and transmits it to the skeleton 111. The skeleton 111 provides support for the skin 112 and provides a connection interface with the horizontal tail and vertical tail to facilitate disassembly and installation.

[0027] like Figure 3As shown, the skin 112 is designed with a pipe beam through hole 1121 and a lock fixing seat 1122. The pipe beam through hole 1121 is located on the right side of the skin 112. There are two pipe beam through holes 1121, and a lock fixing seat 1122 is located between the two pipe beam through holes 1121. The pipe beam through hole 1121 is circular and provides a channel for the pipe beams of the horizontal tail and vertical tail to be inserted into the pipe beams on the skeleton 111. The lock fixing seat 1122 is sunken into the aerodynamic shape of the skin 112 to form a small mounting surface. The lock fixed to the vertical tail and horizontal tail is installed on the surface of the lock fixing seat 1122. When the pipe beams of the horizontal tail and vertical tail are inserted into the pipe beam of the tail crane, the lock is used to lock the tail crane skin and the skin of the horizontal tail and vertical tail together to prevent loosening. In this way, the insertion structure between the pipe beams will not loosen.

[0028] like Figure 4 As shown, the skeleton 111 includes a motor base 1111, docking ribs 1112, longitudinal beams 1113, cross beams 1114, and tubular beams 1115. Multiple cross beams 1114 are provided and connected via longitudinal beams 1113. A docking rib 1112 is connected to each end of the cross beam 1114. A tubular beam 1115 is connected between the two docking ribs 1112. The tubular beam 1115 passes through and connects to the longitudinal beams 1113. The longitudinal beams 1113 transmit the forces of the longitudinal beams, the cross beams 1114 transmit lateral forces, and the tubular beams 1115 provide connections to the horizontal and vertical tails. The inner diameter of the tubular beams is the outer diameter of the horizontal and vertical tails. The docking ribs 1112 dock with the end ribs of the horizontal and vertical tails and also transmit the shear force of the skin. The motor base 1111 is connected to the motor of the thrust unit 12 and to the skin 112, transferring the load of the thrust unit 12 to the skin 112 and, in turn, to the skeleton 111. The longitudinal beam 1113, the cross beam 1114 and the docking rib 1112 are carbon fiber composite flat plate structures. They are formed into a whole by cutting grooves on the parts and plugging them into other parts. The relevant grooves are all CNC-machined with high precision and can be plugged into each other without tooling, reducing tooling costs.

[0029] like Figure 5 As shown, the motor base 1111 is made of aluminum alloy, the preferred material is 7075, and the preferred heat treatment state is T7351. The motor base 1111 is designed with a flange 11111 connected to the skin 112. In order to reduce weight, the flange 11111 is composed of several separate pieces, distributed along the periphery of the motor base 1111, and is not a complete annular structure. Holes for installing fasteners are designed on the flange 11111, and are connected to the skin 112 by gluing and fasteners to improve the reliability of the connection. The motor base 1111 is provided with an air duct hole 11112 and a motor connection hole 11113. The air duct hole 11112 is a strip-shaped hole. The air duct hole 11112 provides a passage for air flow to dissipate heat for the motor behind it, meet the heat dissipation requirements of the motor, and increase the life of the motor. The motor connection hole 11113 is aligned with the mounting hole on the motor, and the motor is connected to the motor base 1111 by bolts.

[0030] like Figure 6 As shown, the docking rib 1112 is designed with a pipe beam fixing hole 11121 and a lock reinforcement plate 11122. There are two pipe beam fixing holes 11121, and the lock reinforcement plate 11122 is located between the two pipe beam fixing holes 11121. The pipe beam 1115 of the skeleton 111 is fixed to the pipe beam fixing holes 11121 on the docking rib 1112. It is connected to the pipe beam 1115 through the docking rib 1112 and the longitudinal beam 1113. These two points are equivalent to two support points, with a certain distance between them, providing a supporting bending moment to withstand the bending loads of the horizontal and vertical tail. The lock reinforcement plate 11122 provides support for the lock fixing seat. Due to the limited stiffness of the skin, to ensure the reliability of the lock, the lock reinforcement plate 11122 is designed on the docking rib 1112. Together with the lock fixing seat on the skin, it provides high installation stiffness for the lock, meeting the function and reliability of the lock.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A UAV tail hanging structure, comprising a tail hanging body, characterized in that: The rear end of the tail pendant body is connected to the thrust unit. The tail pendant body includes a skeleton. The external support of the skeleton is connected to the skin. The rear end of the skeleton is provided with a motor seat, and the motor seat is connected to the skin.

2. The UAV tail hanging structure according to claim 1, characterized in that: A tube beam through hole is provided on the right side of the skin, and two tube beam through holes are provided. A lock fixing seat is provided between the two tube beam through holes, and the lock fixing seat is a sunken structure to form an installation plane.

3. The UAV tail hanging structure according to claim 2, characterized in that: The skeleton includes a crossbeam, and the crossbeams are provided in plurality and connected by longitudinal beams. Both ends of the crossbeams are connected with butt ribs, and a tube beam is connected between the two butt ribs. The tube beam passes through and connects the longitudinal beams.

4. The UAV tail hanging structure according to claim 1, characterized in that: The motor seat is provided with a plurality of flanges along the periphery, the flanges are connected to the skin, and the motor seat is provided with air duct holes and motor connection holes.

5. The UAV tail hanging structure according to claim 4, characterized in that: The air duct hole is a strip-shaped hole, and a plurality of the air duct holes are provided and evenly distributed along the upper end of the motor base.

6. The UAV tail hanging structure according to claim 3, characterized in that: A pipe beam fixing hole is opened on the butt joint rib, and two pipe beam fixing holes are provided. The pipe beam fixing holes connect the pipe beams, and a lock reinforcement plate is provided between the two pipe beam fixing holes.

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