Rack structure of tandem dual-rotor unmanned helicopter

Abstract

The utility model relates to a frame structure of a tandem double-rotor unmanned helicopter, which comprises a triangular truss component and a rotor head connecting component, the triangular truss component comprises an upper carbon fiber tube, a lower carbon fiber tube and a carbon tube retainer, the carbon tube retainers are used for providing support for the carbon fiber tubes and enabling the carbon fiber tubes to keep the position relation, and the multiple carbon tube retainers are distributed in the length direction of the carbon fiber tubes at intervals; the two rotor head connecting assemblies are used for fixing the front rotor head and the rear rotor head at the two ends of the triangular truss assembly. The triangular truss assembly composed of the carbon tube holder and the carbon fiber tubes can provide a light and stable connecting structure, and the requirements for miniaturization and light weight of the rack are met.

Description

Technical Field

[0001] This utility model relates to a frame structure for an unmanned aerial vehicle (UAV), and more particularly to a frame structure for a tandem dual-rotor unmanned helicopter, belonging to the field of UAV fuselage design technology. Background Technology

[0002] The main advantage of tandem rotor helicopters lies in their tandem rotor arrangement, with both rotors providing lift simultaneously. This significantly improves carrying capacity compared to traditional single-rotor helicopters. They allow for multiple payload distribution points between the two rotor shafts, making them suitable for missions requiring mid-flight weight shifts. They require no special trimming, resulting in high transport efficiency and lower takeoff and landing site requirements. Most mainstream tandem rotor UAVs both domestically and internationally use gasoline-powered aircraft engines, offering advantages such as good payload and endurance; however, they suffer from complex structures, difficult maintenance, high operational complexity, and significant engine vibration. In recent years, with the development of electric UAVs, battery-powered unmanned helicopters have also seen widespread application and development. Furthermore, currently, tandem rotor UAVs, both domestically and internationally, are classified as medium-sized UAVs based on size and weight, while small tandem rotor UAVs are rare on the market, posing a challenge to researching tandem rotor models and flight control systems. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a frame structure for a small tandem twin-rotor unmanned helicopter, which is characterized by its small size and light weight, thus meeting the overall design requirements for a small tandem twin-rotor unmanned helicopter.

[0004] The objective of this utility model and the technical problem it solves are achieved by the following technical solution. According to this utility model, a frame structure for a tandem dual-rotor unmanned helicopter includes a triangular truss assembly and a rotor head connection assembly. The triangular truss assembly includes three carbon fiber tubes (one upper and two lower) and carbon tube retainers. The carbon tube retainers provide support for the carbon fiber tubes and maintain their positional relationship. Multiple carbon tube retainers are provided and spaced apart along the length of the carbon fiber tubes. Two rotor head connection assemblies are used to fix the front rotor head and the rear rotor head at both ends of the triangular truss assembly.

[0005] The purpose of this utility model and the technical problems to be solved can be further achieved by the following technical measures.

[0006] The aforementioned tandem rotor unmanned helicopter frame structure also includes two landing gears, which are respectively fixed to the base plates of the front rotor head and the rear rotor head.

[0007] In the aforementioned frame structure of the tandem twin-rotor unmanned helicopter, the carbon tube retainer is formed by connecting an upper carbon tube mounting block and a lower carbon tube mounting block. The upper carbon tube mounting block is a triangular frame, and the apex of the triangular frame is provided with a limiting hole for circumferentially limiting the uppermost carbon fiber tube. The bottom of each of the two lower corners is provided with a first arc-shaped groove. The lower carbon tube mounting block is fixed to the bottom of the upper carbon tube mounting block, and its upper end face is provided with a second arc-shaped groove on each side for cooperating with the first arc-shaped groove to limit the outer periphery of the carbon fiber tube.

[0008] In the aforementioned frame structure of the tandem twin-rotor unmanned helicopter, a positioning element is also provided between the carbon fiber tube and the carbon tube holder. One end of the positioning element passes through the positioning hole on the carbon tube holder, and the other end is located in the hole or groove on the outer periphery of the carbon fiber tube.

[0009] The aforementioned frame structure of the tandem dual-rotor unmanned helicopter includes a rotor head connection assembly comprising a left rotor head connection block and a right rotor head connection block. The two lower carbon fiber tubes in the triangular truss assembly are connected to the rotor head via the left and right rotor head connection blocks at their ends, respectively, while the upper carbon fiber tube is directly connected to the rotor head at its end.

[0010] The aforementioned tandem dual-rotor unmanned helicopter frame structure also includes a concave-convex structure on the upper carbon fiber tube end face of the triangular truss assembly for anti-rotation connection with the rotor head.

[0011] The aforementioned tandem dual-rotor unmanned helicopter frame structure includes a flight controller mounting plate on the triangular truss assembly for mounting flight control hardware and securing cables.

[0012] The aforementioned tandem dual-rotor unmanned helicopter frame structure has a Z-shaped flight controller mounting plate. The upper horizontal part of the Z-shape is fixedly connected to the uppermost carbon fiber tube, the lower horizontal part is provided with a cable clamping block, and the vertical part is provided with a flight controller shock absorber plate. Furthermore, the lower horizontal part of the flight controller mounting plate is also connected to the rotor head at its end.

[0013] The aforementioned tandem dual-rotor unmanned helicopter frame structure also includes a GNSS positioning system mounting plate, a battery pack mounting bracket, and a throwing mechanism mounting bracket fixed on the triangular truss assembly.

[0014] The aforementioned tandem dual-rotor unmanned helicopter frame structure has a data transmission module mounting block at the lower front end of both the front and rear rotor heads, which is used to mount small cameras, data transmission links, or obstacle avoidance radars.

[0015] Compared with the prior art, this utility model has significant advantages and beneficial effects. Through the above technical solution, this utility model achieves considerable technological advancement and practicality, and has broad industrial application value. It possesses at least the following advantages:

[0016] 1. This utility model, by setting up a triangular truss assembly and a rotor head connection assembly, can assemble two commercially available Alto 450 helicopter models into a tandem dual-rotor drone without the need for a synchronous transmission mechanism. The entire frame is made of carbon fiber, which has the advantages of simple structure, light weight, stability and low cost.

[0017] 2. This utility model, by setting up a flight control mounting plate and a data transmission module mounting plate, allows the use of commercially available PX4 / APM flight control hardware and data links, meeting the requirements for debugging, verification, and flight control system design and optimization of tandem dual-rotor UAVs, and also enhances the expansion capabilities of the measurement and control module.

[0018] 3. This utility model improves the battery pack and mission payload carrying capacity by setting the landing gear installed on the rotor head without occupying the space under the frame.

[0019] 4. By setting the distance between the front and rear rotor shafts to be greater than the diameter of the rotor disk, the rotor disks have no overlapping area, and the lift of the rotor disks is not consumed by the front and rear rotors, resulting in better hovering performance of the entire aircraft.

[0020] 5. This utility model provides a lightweight and stable connection structure through a triangular truss assembly composed of a carbon tube retainer and carbon fiber tubes, which meets the requirements for miniaturized and lightweight frames. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the frame structure assembly of a tandem dual-rotor unmanned helicopter according to an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the overall frame structure of a tandem dual-rotor unmanned helicopter according to an embodiment of this utility model;

[0023] Figure 3 This is a front view schematic diagram of the frame structure of a tandem dual-rotor unmanned helicopter according to an embodiment of this utility model;

[0024] Figure 4 This is a top view schematic diagram of the frame structure of a tandem dual-rotor unmanned helicopter according to an embodiment of this utility model;

[0025] Figure 5 This is a left-side view of the frame structure of a tandem dual-rotor unmanned helicopter according to an embodiment of this utility model;

[0026] Figure 6This is a cross-sectional view of the frame structure of a tandem twin-rotor unmanned helicopter according to an embodiment of this utility model.

[0027] [Explanation of Key Component Symbols]

[0028] 1-Front rotor head, 2-GNSS positioning system mounting plate, 3-Triangular truss assembly, 4-Rear rotor head, 5-Landing gear, 6-Jeting mechanism mounting bracket, 7-Battery pack mounting bracket, 8-Battery pack, 9-Flight controller mounting plate, 10-Data transmission module mounting block, 11-Carbon fiber tube, 12-Carbon fiber tube upper mounting block, 13-Rotor head right connecting block, 14-Rotor head left connecting block, 15-Flight control shock absorber plate, 16-Cable clamping block, 17-Carbon fiber tube lower mounting block, 121-First arc groove, 171-Second arc groove, 18-Limiting structure, 19-Threaded hole, 20-Positioning hole, 21-Limiting hole, 22-Connecting base plate, 23-Connecting seat, 24-Anti-rotation groove. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended purpose of the invention, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation method, structure, features and effects of the frame structure of the tandem dual-rotor unmanned helicopter proposed according to this utility model.

[0030] Please see Figure 1-5 This utility model provides a frame structure for a tandem dual-rotor unmanned helicopter. The frame structure includes a triangular truss assembly 3, a rotor head connection assembly, and a landing gear 5. The triangular truss assembly 3 includes three carbon fiber tubes 11 and multiple carbon tube retainers. The three carbon fiber tubes 11 are distributed in an isosceles triangle. The carbon tube retainers can provide support for the three carbon fiber tubes 11 and maintain a stable relative position between the three carbon fiber tubes 11.

[0031] In this embodiment, the carbon tube retainer is formed by connecting the upper carbon tube mounting block 12 and the lower carbon tube mounting block 17 with screws. The upper carbon tube mounting block 12 has a triangular frame structure. At the apex of the triangular frame, there is a limiting hole 21 for circumferentially limiting the uppermost carbon fiber tube 11. At the two bottom corners of the triangular frame, there is a first arc-shaped groove 121 that adapts to the outer periphery of the upper end of the two lower carbon fiber tubes 11. The lower carbon tube mounting block 17 is fixed to the bottom of the lower carbon tube mounting block 12, and there is a second arc-shaped groove 171 on both sides of its upper end face for adapting to the outer periphery of the lower end of the carbon fiber tube 11. When the upper carbon tube mounting block 12 and the lower carbon tube mounting block 17 are fixed, the corresponding first arc-shaped groove 121 and second arc-shaped groove 171 are joined together to form the limiting hole 21 for constraining the outer periphery of the carbon fiber tube 11, thereby supporting and positioning the two lower carbon fiber tubes 11. Specifically, the carbon nanotube upper mounting block 12 and the carbon nanotube lower mounting block 17 are connected and fixed by screws in the threaded holes 19 near the two pairs of first arc-shaped grooves 121 and second arc-shaped grooves 171. Preferably, each side of the carbon nanotube upper mounting block 12 has a hollow structure for weight reduction, but it is not limited to this. The bottom of the carbon nanotube lower mounting block 17 is also provided with a groove for weight reduction, but it is not limited to this.

[0032] In this embodiment, the three carbon fiber tubes 11 are arranged in an equilateral triangle, but this is not a limitation. Preferably, the carbon fiber tubes 11 have a size of φ12mm.

[0033] In this embodiment, a limiting structure 18 is provided on the outer periphery of the carbon fiber tube 11 at the position where it mates with the limiting hole 21 on the carbon tube holder. This limiting structure 18 is a through hole or a groove. A positioning hole 20 extending radially along the limiting hole 21 is provided at a corresponding position on the upper mounting block 12 and / or lower mounting block 17 of the carbon tube. The end of a positioning element passing through the positioning hole 20 mates with the limiting structure 18 on the carbon fiber tube 11, thereby limiting the carbon fiber tube 11 axially and circumferentially within the limiting hole 21. Preferably, the positioning hole 20 is a threaded hole, and the positioning element is a screw, but this is not a limitation. Preferably, the limiting structure 18 is a groove. Two limiting structures 18 are symmetrically arranged on the outer periphery of the carbon fiber tube 11, with the upper limiting structure 18 engaging with the positioning element in the positioning hole 20 on the upper mounting block 12, and the lower limiting structure 18 engaging with the positioning element in the positioning hole 20 on the lower mounting block 17. The positioning element between the carbon fiber tube and the carbon tube retainer assembly of this utility model not only realizes the connection and fixation of the two, but also enhances the rigidity of the triangular truss assembly.

[0034] The rotor head connection assembly includes a left rotor head connecting block 14 and a right rotor head connecting block 13. There are two sets of this rotor head connection assembly, fixed to the front and rear ends of the triangular truss assembly 3 respectively, for fixing the front rotor head 1 and the rear rotor head 4 to the triangular truss assembly 3. In this embodiment, one of the two carbon fiber tubes 11 at the bottom of the triangular truss assembly 3 has a left rotor head connecting block 14 fixed to its front and rear ends, and the other has a right rotor head connecting block 13 fixed to its front and rear ends. The left and right rotor head connecting blocks 14 and 13 at the front end of the triangular truss assembly 3 together connect and fix the front rotor head 1, and the left and right rotor head connecting blocks 14 and 13 at the rear end of the triangular truss assembly 3 together connect and fix the rear rotor head 4.

[0035] In this embodiment, both the left connecting block 14 and the right connecting block 13 of the rotor head include a connecting base plate 22 and a connecting seat 23 fixed on the connecting base plate 22. There are two connecting seats 23, which are distributed at intervals on the connecting base plate 22 along the extension direction of the carbon fiber tube 11. The connecting seat 23 is provided with a through hole adapted to the carbon fiber tube 11. The connecting seat 23 also achieves axial positioning of the two through the cooperation of the positioning element on it with the groove or hole on the outer periphery of the carbon fiber tube 11, so as to ensure the reliability of the connection between the connecting seat 23 and the carbon fiber tube 11.

[0036] In this embodiment, the connecting base plate 22 on the left connecting block 14 and the right connecting block 13 of the rotor head is located between the two carbon fiber tubes 11, and the connecting base plate 22 is provided with connecting holes for connecting the rotor head and weight reduction holes for weight reduction.

[0037] In this embodiment, the uppermost carbon fiber tube 11 of the triangular truss assembly 3 is connected at both ends to the front rotor head 1 and the rear rotor head 4, respectively. Preferably, anti-rotation grooves 24 are provided on the end faces of both ends of the carbon fiber tube 11. By cooperating with the corresponding protrusions on the rotor head, the anti-rotation connection between the carbon fiber tube and the rotor head can be achieved. In other embodiments of this utility model, the upper carbon fiber tube 11 can achieve anti-rotation connection by cooperating with the anti-rotation protrusions provided on its end faces and the grooves on the rotor head.

[0038] The landing gear 5 consists of two units, front and rear, located below the rotor head connection assembly and respectively fixed to the base plates of the front rotor head 1 and the rear rotor head 4. The fixing of the landing gear 5 does not occupy space in the fuselage belly, improving the battery pack and mission payload carrying capacity. In this embodiment, the landing gear 5 is an inverted U-shape with an opening that gradually widens from top to bottom, ensuring the stability of the fuselage.

[0039] The triangular truss assembly 3 is also fixed with a flight controller mounting plate 9 for mounting flight control hardware and securing cables. The flight controller mounting plate 9 is equipped with a flight controller damping plate 15 and a cable clamping block 16. In this embodiment, the flight controller mounting plate 9 is Z-shaped. The upper horizontal portion of the Z-shape is fixedly connected to the uppermost carbon fiber tube 11, the lower horizontal portion is equipped with a cable clamping block 16, and the vertical portion is equipped with a flight controller damping plate 15. Furthermore, the lower horizontal portion of the flight controller mounting plate 9 is also connected to the rotor head at its corresponding end.

[0040] The triangular truss assembly 3 is also fixed with a GNSS positioning system mounting plate 2, a battery pack mounting bracket 7, and a throwing mechanism mounting bracket 6. Preferably, the GNSS positioning system mounting plate 2 is fixed on the flight controller mounting plate 9, but it is not limited to this. The GNSS positioning system is connected and communicates with the front rotor head 1 and the rear rotor head 4, and is provided with a GPS mounting slot, cable through holes, and a receiver mounting surface. The battery pack mounting bracket 7 and the throwing mechanism mounting bracket 6 are respectively fixed to the bottom of a carbon tube holder and connected to the carbon tube lower mounting block 17. The battery pack mounting bracket 7 can install 3s or 4s lithium batteries. Preferably, there are two battery pack mounting brackets 7, and the whole aircraft can install two sets of battery packs 8. The throwing mechanism mounting bracket 6 can install a simple throwing mechanism for model aircraft.

[0041] Both the front rotor head 1 and the rear rotor head 4 are provided with a data transmission module mounting block 10 at their lower front ends. A small camera, data transmission link or obstacle avoidance radar can be installed on the data transmission module mounting block 10.

[0042] The rotor head of this utility model can be modified from the rotor head of an existing single-rotor helicopter, and the frame of this utility model can be combined with an existing single-rotor helicopter to form a tandem dual-rotor UAV.

[0043] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] Although the present invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the present invention. Accordingly, this specification and drawings are merely exemplary descriptions of the present invention as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include such modifications and modifications.

Claims

1. A frame structure for a tandem dual-rotor unmanned helicopter, characterized in that: The device includes a triangular truss assembly and a rotor head connection assembly. The triangular truss assembly includes three carbon fiber tubes (one upper and two lower) and carbon tube retainers. The carbon tube retainers provide support for the carbon fiber tubes and maintain their positional relationship. There are multiple carbon tube retainers, which are spaced apart along the length of the carbon fiber tubes. There are two rotor head connection assemblies, which are used to fix the front rotor head and the rear rotor head at both ends of the triangular truss assembly.

2. The frame structure of the tandem twin-rotor unmanned helicopter according to claim 1, characterized in that: It also includes two landing gears, which are located below the rotor head connection assembly.

3. The frame structure of the tandem twin-rotor unmanned helicopter according to claim 1, characterized in that: The carbon tube retainer is formed by connecting an upper carbon tube mounting block and a lower carbon tube mounting block. The upper carbon tube mounting block is a triangular frame, and the apex of the triangular frame is provided with a limiting hole for limiting the circumference of the uppermost carbon fiber tube. The bottom of the two lower corners is provided with a first arc-shaped groove. The lower carbon tube mounting block is fixed to the bottom of the upper carbon tube mounting block, and its upper end face is provided with a second arc-shaped groove on both sides for cooperating with the first arc-shaped groove to limit the outer circumference of the carbon fiber tube.

4. The frame structure of the tandem twin-rotor unmanned helicopter according to claim 3, characterized in that: A positioning element is also provided between the carbon fiber tube and the carbon tube holder. One end of the positioning element passes through the positioning hole on the carbon tube holder, and the other end is located in the hole or groove on the outer periphery of the carbon fiber tube.

5. The frame structure of the tandem twin-rotor unmanned helicopter according to any one of claims 1-4, characterized in that: The rotor head connection assembly includes a rotor head left connection block and a rotor head right connection block. The two carbon fiber tubes located at the bottom of the triangular truss assembly are connected to the rotor head through the rotor head left connection block and rotor head right connection block at their ends, respectively. The ends of the carbon fiber tubes located at the top are directly connected to the rotor head.

6. The frame structure of the tandem twin-rotor unmanned helicopter according to claim 5, characterized in that: The upper carbon fiber tube end face of the triangular truss assembly is also provided with a concave-convex structure for anti-rotation connection with the rotor head.

7. The frame structure of the tandem twin-rotor unmanned helicopter according to claim 5, characterized in that: The triangular truss assembly is equipped with a flight controller mounting plate for installing flight control hardware and securing cables.

8. The frame structure of the tandem twin-rotor unmanned helicopter according to claim 7, characterized in that: The flight controller mounting plate is Z-shaped. The upper horizontal part of the Z-shape is fixedly connected to the uppermost carbon fiber tube, the lower horizontal part is provided with a cable clamping block, and the vertical part is provided with a flight controller shock absorber plate.

9. The frame structure of the tandem twin-rotor unmanned helicopter according to claim 7, characterized in that: The triangular truss assembly is also fixed with a GNSS positioning system mounting plate, a battery pack mounting bracket, and a throwing mechanism mounting bracket.

10. The frame structure of the tandem twin-rotor unmanned helicopter according to claim 8, characterized in that: Both the front rotor head and the rear rotor head have a data transmission module mounting block at the lower front end, which is used to install a small camera, data transmission link or obstacle avoidance radar.

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