Unmanned helicopter and its rotor and folding structure

Abstract

The utility model relates to an unmanned helicopter and its rotor and folding structure and belongs to the technical field of unmanned plane. The folding structure comprises a hub, an end of which is provided with a paddle clamp, two upper and lower through mounting holes are arranged on the paddle clamp, a paddle blade, an end of which is provided with two connecting holes matched with the mounting holes, two stepped bolts, each of which passes through one mounting hole and one connecting hole to connect the paddle blade to the paddle clamp, and the outer peripheral wall of the cylinder part of the stepped bolt is a smooth surface, when any stepped bolt is removed, the paddle blade can rotate around the outer peripheral wall of the cylinder part of the other stepped bolt to fold the rotor. The folding structure of the rotor of the unmanned helicopter of the utility model can make the paddle blade rotate around the other stepped bolt when one stepped bolt is removed, so that the folding of the rotor can be conveniently realized, and the reconnection can be conveniently carried out after the paddle blade is rotated to the original position.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, specifically to an unmanned helicopter and its rotor and folding structure. Background Technology

[0002] The rotor system of an unmanned helicopter is a core component of the helicopter, affecting the overall operation of the helicopter and is a key aspect of helicopter technology.

[0003] Currently, unmanned helicopters primarily use ordinary bolts and lack folding mechanisms, which poses significant inconveniences for transportation and installation. During transport, especially short-distance transport, the rotor system is often disassembled for transport due to its length, and the complexity of the rotor system results in considerable time consumption. Similarly, the use of ordinary bolts in helicopter installation also presents problems such as long installation times and difficulties. Utility Model Content

[0004] This invention provides an unmanned helicopter and its rotor and folding structure, aiming to at least partially solve the above-mentioned technical problems.

[0005] As a first aspect of this utility model, a folding structure for the rotor of an unmanned helicopter is provided, comprising:

[0006] The propeller hub has a propeller clamp at one end, and the propeller clamp has two through mounting holes.

[0007] The blade has two connection holes at its end that match the mounting holes;

[0008] Two stepped bolts, each passing through a mounting hole and a connecting hole, are used to connect the blade to the blade clamp. The outer peripheral wall of the cylindrical portion of the stepped bolt is a smooth surface. When either stepped bolt is removed, the blade can rotate around the outer peripheral wall of the cylindrical portion of the other stepped bolt to fold the rotor.

[0009] The stepped bolt has a blind hole at its head, and a bolt with a hole at its head is connected inside the blind hole. Two bolts with holes at their heads are connected together by a metal wire.

[0010] The stepped bolt has a slotted nut connected to its front end, and the stepped bolt and the slotted nut are fixedly connected by a cotter pin.

[0011] The stepped bolt is provided with a first bushing and a second bushing between it and the two mounting holes, respectively.

[0012] The propeller clamp includes two flat plates spaced apart vertically, and the mounting hole passes through the two flat plates.

[0013] The head of the stepped bolt is located above the propeller clamp.

[0014] Specifically, a first washer is provided between the head of the stepped bolt and the first bushing; a second washer is provided between the slotted nut and the second bushing; and a third washer is provided between the bolt with a hole in the head and the stepped bolt.

[0015] As a second aspect of this utility model, an unmanned helicopter rotor is also provided, including the aforementioned folding structure.

[0016] As a second aspect of this utility model, an unmanned helicopter is also provided, the rotor of which includes the aforementioned folding structure.

[0017] Based on the above solution, it can be seen that the unmanned helicopter and its rotor and folding structure of this utility model have at least the following beneficial effects compared with the prior art:

[0018] The folding structure of the rotor of the unmanned helicopter of this utility model allows the blade to rotate around another step bolt when one step bolt is removed, thus making it easy to fold the rotor. After the blade is rotated back to its original position, it can also be easily reconnected. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below.

[0020] Figure 1 This is a schematic diagram of the rotor of this utility model after folding;

[0021] Figure 2 This is a schematic diagram of the folding structure of the rotor of this utility model;

[0022] Figure 3 for Figure 2 A cross-sectional schematic diagram of the folded structure.

[0023] In the above figures, the meanings of the reference numerals are as follows:

[0024] In the diagram: 1. Stepped bolt; 2. Slotted nut; 3. First washer; 4. First bushing; 5. Head bolt with hole; 6. Second bushing; 7. Second washer; 8. Third washer; 9. Propeller hub; 91. Propeller clamp; 10. Propeller blade. Detailed Implementation

[0025] To better understand the technical solutions of the embodiments of this utility model, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0026] It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] like Figures 1 to 3 As shown in the figure, this utility model embodiment discloses a folding structure for an unmanned helicopter rotor, which includes a rotor hub 9, rotor blades 10 and two stepped bolts 1.

[0028] The rotor hub 9 has a rotor clamp 91 at its end, and the rotor clamp 91 has two through mounting holes. Both mounting holes are smooth holes. The rotor blade 10 has two connecting holes at its end that match the mounting holes. When the end of the rotor blade 10 is aligned with the rotor clamp 91, the connecting holes and the mounting holes are coaxially aligned.

[0029] Each stepped bolt 1 passes through a mounting hole and a connecting hole to connect the blade 10 to the blade clamp 91. The outer peripheral wall of the cylindrical portion of the stepped bolt 1 has a smooth surface. When any stepped bolt 1 is removed from the blade clamp 91, the blade 10 can rotate around the outer peripheral wall of the cylindrical portion of the remaining stepped bolt 1 to fold the rotor. The stepped bolt 1 has a hexagonal head, a smooth cylindrical portion, and a threaded portion at the end. The diameter of the threaded portion is smaller than that of the cylindrical portion, thus forming a two-stage stepped structure.

[0030] The folding structure of the rotor of this unmanned helicopter allows the rotor blades to rotate around another step bolt 1 when one step bolt 1 is removed, thus facilitating rotor folding. After rotating the blades back to their original position, they can be easily reconnected. The folding time for a single rotor blade is no more than 20 minutes, and the unfolding time is no more than 15 minutes. Operators only need simple tools such as wrenches, and the work can be completed without requiring a high level of skill.

[0031] By using stepped bolt 1, only one stepped bolt 1 needs to be removed from each blade during folding to complete the disassembly operation. This significantly reduces the length of the folded rotor. Compared to the blades, the rotor hub is very short, and the total length after folding is not much different from the length of a single blade, thus avoiding design difficulties in transportation and meeting transportation requirements. Similarly, only one stepped bolt 1 needs to be installed on each blade during installation, greatly reducing installation time.

[0032] In emergency situations, such as forest fires and emergency rescues, helicopters can significantly reduce preparation time and save lives and property.

[0033] Furthermore, the head of the stepped bolt 1 has a blind hole, and a head-with-hole bolt 5 is connected inside the blind hole. The two head-with-hole bolts 5 are connected as one unit by a metal wire. After the two head-with-hole bolts 5 are connected, the two stepped bolts 1 can be fixed to prevent them from rotating, thereby improving the anti-loosening effect.

[0034] Furthermore, a slotted nut 2 is connected to the front end of the stepped bolt 1, and the stepped bolt 1 and the slotted nut 2 are fixedly connected by a cotter pin. Specifically, a hole is drilled at the front end of the stepped bolt 1, and the cotter pin is passed through the stepped bolt 1 and fixed with the slotted nut 2. The slotted nut 2 can achieve a reliable anti-loosening connection effect.

[0035] A first bushing 4 and a second bushing 6 are respectively provided between the stepped bolt 1 and the two mounting holes. These two bushings can have relatively smooth inner wall surfaces to protect the outer wall surface of the stepped bolt 1. The first bushing 4 and the second bushing 6 can be provided with a series of inner diameter dimensions, which can be selected and matched as needed, and the tightness of the fit of the stepped bolt 1 can also be adjusted.

[0036] Furthermore, the propeller clamp 91 includes two flat plates spaced apart vertically, with a mounting hole penetrating both plates. This improves the manufacturing precision of the propeller clamp 91 and enhances the positional accuracy of the mounting hole.

[0037] The head of the stepped bolt 1 is positioned above the paddle clamp 91, making the stepped bolt 1 easy to install and less likely to fall off.

[0038] A first washer 3 is provided between the head of the stepped bolt 1 and the first bushing 4; a second washer 7 is provided between the slotted nut 2 and the second bushing 6; and a third washer 8 is provided between the bolt 5 with a hole in its head and the stepped bolt 1. These washers can distribute pressure, and when elastic washers are selected, they can also play a role in preventing loosening.

[0039] This utility model embodiment also discloses an unmanned helicopter rotor, which includes the above-described folding structure.

[0040] This utility model embodiment also discloses an unmanned helicopter, whose rotor includes the above-described folding structure.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A folding structure for the rotor of an unmanned helicopter, characterized in that, include: The propeller hub has a propeller clamp at one end, and the propeller clamp has two through mounting holes. The blade has two connection holes at its end that match the mounting holes; Two stepped bolts, each passing through a mounting hole and a connecting hole, are used to connect the blade to the blade clamp. The outer peripheral wall of the cylindrical portion of the stepped bolt is a smooth surface. When either stepped bolt is removed, the blade can rotate around the outer peripheral wall of the cylindrical portion of the other stepped bolt to fold the rotor.

2. The folding structure of the unmanned helicopter rotor according to claim 1, characterized in that, The head of the stepped bolt has a blind hole, and a head-with-hole bolt is connected in the blind hole. The two head-with-hole bolts are connected as one unit by a metal wire.

3. The folding structure of the unmanned helicopter rotor according to claim 2, characterized in that, The front end of the stepped bolt is connected to a slotted nut, and the stepped bolt and the slotted nut are fixedly connected by a cotter pin.

4. The folding structure of the unmanned helicopter rotor according to claim 3, characterized in that, A first bushing and a second bushing are respectively provided between the stepped bolt and the two mounting holes.

5. The folding structure of the unmanned helicopter rotor according to claim 4, characterized in that, The propeller clamp includes two flat plates spaced apart vertically, and the mounting hole passes through both flat plates.

6. The folding structure of the unmanned helicopter rotor according to claim 5, characterized in that, A first washer is provided between the head of the stepped bolt and the first bushing; a second washer is provided between the slotted nut and the second bushing; and a third washer is provided between the bolt with a hole in the head and the stepped bolt.

7. The folding structure of the unmanned helicopter rotor according to claim 1, characterized in that, The head of the stepped bolt is located above the paddle clamp.

8. A rotor for an unmanned helicopter, characterized in that, Includes the folding structure as described in any one of claims 1 to 7.

9. An unmanned helicopter, characterized in that, Its rotor includes the folding structure as described in any one of claims 1 to 7.

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