Telescopic unmanned aerial vehicle landing gear

Abstract

The utility model discloses a telescopic unmanned aerial vehicle landing gear, which relates to the technical field of unmanned aerial vehicle landing gears and comprises a frame, a base and a landing gear. Four connecting frames are arranged around the lower portion of the machine body, the four connecting frames are connected with supporting rod shafts, supporting rods are connected with base springs, the supporting rods are connected with the wire wheel through connecting wires, a gear motor is arranged in the machine body, and the output end of the gear motor penetrates through the center of the bottom of the machine body to be connected with the wire wheel. According to the novel landing gear of the unmanned aerial vehicle, the connecting frame can be contracted in the takeoff process through stretching and retracting of the landing gear, the flight stability is improved, the connecting frame is unfolded in the landing process, the contact area between the connecting frame and the ground is increased, vibration is reduced, landing of the unmanned aerial vehicle is helped, and landing convenience of the unmanned aerial vehicle is improved.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and more specifically to a retractable UAV take-off and landing device. Background Technology

[0002] Unmanned aerial vehicles (UAVs), also known as drones, are unmanned aircraft controlled by radio remote control equipment and onboard program control devices, or operated autonomously, either fully or intermittently, by an onboard computer. Compared to manned aircraft, UAVs are often more suitable for dangerous missions. UAVs can be categorized into military and civilian applications. In the military field, UAVs are divided into reconnaissance aircraft and target drones. In the civilian field, the combination of UAVs with industry applications represents the true necessity of UAVs. Currently, applications in aerial photography, agriculture, plant protection, miniature selfies, express delivery, disaster relief, wildlife observation, infectious disease monitoring, surveying, news reporting, power line inspection, disaster relief, film and television shooting, and creating romantic moments have greatly expanded the uses of UAVs. Developed countries are also actively expanding industry applications and developing UAV technology. The landing gear is a particularly important component of a UAV, as its quality determines the stability of the UAV. The drag from the landing gear during flight also affects the flight speed. During landing, due to inertia, the landing gear experiences significant vibration upon contact with the ground, posing a significant challenge to the landing gear during UAV descent.

[0003] For example, the novel UAV landing gear with authorization announcement number CN207045711U, while capable of stable landing, suffers from insufficient flexibility in its connection method. The landing gear uses a fixed connecting frame to the airframe, making it impossible to quickly change or adjust the landing gear configuration according to different mission requirements, thus increasing the complexity of transportation and deployment. Utility Model Content

[0004] The purpose of this utility model is to solve the above-mentioned technical problems by providing a retractable drone landing device, which includes a body, a base and a landing device, wherein a circular base is installed at the bottom of the body and a landing device is installed between the circular base and the body.

[0005] The lifting device includes a connecting frame, a support rod, a wire wheel, a spring, a connecting wire, and a reduction motor;

[0006] The geared motor is installed inside the machine body. The output end of the geared motor passes through the center of the bottom of the machine body and the center of the base and is connected to the wire wheel. The wire wheel has several winding cavities, and each winding cavity is wound with and fixed with a connecting wire.

[0007] The base has four arc-shaped guide slots evenly spaced along its circumference on the surface near the geared motor, and four first lifting lugs are evenly distributed around the base near the wire wheel;

[0008] Four connecting frames are evenly distributed around the base, centered on it. One end of a support rod is hinged to a connecting frame. A second lifting lug is located at the tail end of the support rod, with one end of a spring connected to the first lifting lug on the base and the other end connected to the second lifting lug. A slider is located below the support rod, sliding within an arc-shaped guide groove on the base. Connecting lines are connected to the support rod. A rubber pad at the tail end of the support rod optimizes shock absorption and increases anti-slip performance, providing high cushioning for the drone's landing. During takeoff, the geared motor drives the cable wheel, which pulls the four connecting lines. These lines pull the support rod to its slider limit, retracting the landing gear. When the drone lands, the geared motor reverses, driving the cable wheel to release the four connecting lines. The four support rods, via spring transmission, reach their slider limit, extending to increase the contact area with the ground and enhance the drone's landing stability.

[0009] As a preferred technical solution of this utility model, the wire wheel needs at least four cavities to control four support rods through connecting lines. The wire wheel is provided with bending plates that are evenly distributed along the circumference of the wire wheel with the center of the wire wheel as the center. The wire wheel is connected to the central bearing of the bending plates. Two bending plates are provided with spring pieces located on the sides of the four cavities respectively. Each of the four bending plates is provided with a hook to correct the position of the connecting lines.

[0010] As a preferred embodiment of this utility model, a magnet is placed in the arc-shaped groove of the base to reduce the instability caused by the spring when the lifting mechanism is deployed;

[0011] As a preferred embodiment of this utility model, each support rod is provided with a ring of rubber pads and has anti-slip textures;

[0012] As a preferred technical solution of this utility model, a sensor is placed in the arc-shaped groove of the base to detect the position of the connecting frame and feed it back to the UAV control system.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. Combining a four-jaw synchronous telescopic mechanism, synchronous telescopic movement is achieved through mechanical linkage, improving stability;

[0015] 2. The landing gear can be retracted according to mission requirements, making transportation more convenient and adaptable to complex terrain;

[0016] 3. This solution has low manufacturing cost and low weight, and does not add too much load to the drone's flight. Attached Figure Description

[0017] Figure 1 This is a diagram showing the retraction of the landing mechanism when the drone lands.

[0018] Figure 2This is a diagram showing the retracted landing gear mechanism;

[0019] Figure 3 This is a plan view of the landing mechanism;

[0020] Figure 4 This is a cross-sectional schematic diagram of the landing mechanism;

[0021] Figure 5 This is a schematic diagram of an electric wire reel;

[0022] Figure 6 This is another planar gear design diagram.

[0023] Reference numerals: 1. Body; 2. Base; 3. Lifting device; 301. Connecting frame; 302. Support rod; 303. Wire wheel; 304. Spring; 305. Connecting wire; 306. Rubber pad; 307. Gear motor; 308. Second lifting lug; 309. Arc guide groove; 310. Slider; 311. Bending plate; 312. Spring piece; 313. Hook; 314. Magnet; 315. First lifting lug.

[0024] like Figures 1 to 5 As shown, this utility model proposes a retractable unmanned aerial vehicle (UAV) take-off and landing device:

[0025] The system includes a body, a base, and a lifting device. The base is located at the bottom of the body, and a circular base is installed at the bottom of the body. The lifting device is installed between the circular base and the body. The lifting device consists of a support rod, a connecting frame, a spring, a connecting wire, a wire wheel, and a reduction motor. The output end of the reduction motor passes through the center of the bottom of the body and the center of the base, and connects to the wire wheel. The wire wheel has several winding cavities, and each winding cavity is wound with and fixed with a connecting wire. Four lifting lugs are evenly distributed around the base near the wire wheel. The surface of the base near the reduction motor is edged with... The device has four equally spaced arc-shaped guide slots along its circumference; four connecting frames are evenly distributed around the base as the center; one end of the support rod is hinged to the connecting frame, and the tail end of the support rod is equipped with a second lifting lug; one end of the spring is connected to the first lifting lug of the base; the other end is connected to the second lifting lug; a slider is provided below the support rod, and the slider slides in the arc-shaped guide slot of the base; the support rod is connected to the wire wheel through a connecting line; a rubber pad is provided at the tail end of the support rod to optimize shock absorption and increase anti-slip performance, providing high cushioning for the landing of the drone. Detailed Implementation

[0026] During takeoff, the geared motor drives the cable wheel, which pulls four connecting cables. These cables then pull the support rods to their limit positions on the support rod sliders, causing the landing gear to retract. When the drone lands, the geared motor reverses direction to drive the cable wheel, which releases the four connecting cables. The four support rods are then extended via springs to their limit positions on the support rod sliders, increasing the contact area with the ground and enhancing the stability of the drone's landing.

[0027] Before the drone takes off, the flight controller sends a retraction command. The geared motor drives the cable wheel to retract the connecting wires, and the support rod retracts accordingly to reduce flight drag. The deployment process is as follows: the geared motor rotates forward → the cable wheel drives the four connecting wires to release → the spring pops open → the support rod extends outward until the limit sensor triggers and stops.

[0028] Upon landing, the flight controller triggers a deployment command based on altitude data. The geared motor drives the cable wheel in reverse, releasing the connecting cables. Springs then quickly eject the support frame, increasing the contact area with the ground to adapt to uneven terrain. The retraction process involves the geared motor reversing → the cable wheel retracting the four connecting cables → the connecting cables pulling the support rod back into the base.

[0029] A similar structure exists where a drive wheel rotates four transmission gears. The structure consists of four connecting frames around the lower part of the fuselage, connected to the base via shafts. These connecting frames are also connected to the transmission gears via shafts. The drive wheel meshes with the four transmission gears, and the four driven gears are symmetrically distributed on the same plane. A reduction motor is located within the fuselage, with its output end passing through the center of the fuselage and connecting to the drive gear. The support frame is connected to the connecting frames via shafts. During takeoff, the reduction motor drives the drive gear, which in turn drives the four transmission gears. The four supports rotate to their limit positions via gear transmission, and the support rods also rotate with the supports until they reach their limit positions, at which point the landing gear is retracted. When the UAV lands, the DC motor reverses direction, driving the drive gear, which in turn drives the four transmission gears. The four supports rotate to their limit positions via gear transmission, and the four support rods unfold accordingly.

[0030] However, this method is too slow to unfold, the gears are too heavy, and the cost is higher than the method chosen in this paper. Therefore, the structure in this paper is chosen.

[0031] The control method of this utility model is controlled by manually starting and stopping the switch. The wiring diagram of the power component and the power supply are common knowledge in the field. Since this utility model is mainly used to protect the take-off device of the UAV, the control method and wiring layout will not be explained in detail.

Claims

1. A retractable unmanned aerial vehicle (UAV) take-off and landing device, comprising a body (1); Its features are: A circular base (2) is installed at the bottom of the body (1), and a lifting device (3) is installed between the circular base (2) and the body (1). The lifting device (3) includes a connecting frame (301), a support rod (302), a wire wheel (303), a spring (304), a connecting wire (305), and a geared motor (307). The geared motor (307) is installed inside the machine body (1). The output end of the geared motor (307) passes through the bottom center of the machine body (1) and the base center and is connected to the wire wheel (303) for transmission. The wire wheel (303) is provided with several winding cavities, and each winding cavity is wound with and fixed with a connecting wire (305). The base (2) has four arc-shaped guide slots (309) evenly spaced along its circumference on the surface near the geared motor (307), and four first lifting lugs (315) are evenly distributed around the base near the wire wheel (303). Four connecting frames (301) are evenly distributed around the base (2) along its circumference; one end of the support rod (302) is hinged to the connecting frame (301); the tail end of the support rod (302) is provided with a second lifting lug (308), one end of the spring is connected to the first lifting lug (315) of the base; the other end is connected to the second lifting lug (308), and a slider (310) is provided below the support rod (302). The slider (310) slides in the arc-shaped guide groove (309) of the base (2), and the connecting line (305) is connected to the support rod (302).

2. The retractable UAV landing device according to claim 1, characterized in that: The wire wheel (303) requires at least four cavities to control four support rods (302) via connecting lines (305). The wire wheel (303) is provided with bending plates (311) evenly distributed around the center of the wire wheel. The wire wheel (303) is connected to the central bearing of the bending plates (311). Two of the bending plates (311) are provided with spring pieces (312) located on the sides of the four cavities respectively. Each of the four bending plates (311) is provided with a hook (313) to correct the position of the connecting lines (305).

3. The retractable UAV landing device according to claim 1, characterized in that: The support rod is equipped with a rubber pad (306), and the rubber pad (306) has anti-slip texture.

4. The retractable UAV landing device according to claim 1, characterized in that: The base (2) is installed on the top of the wire wheel (303), and a magnet (314) is placed in the arc-shaped groove of the base (2).

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