Coaxial propeller-reversing unmanned aerial vehicle power device

Abstract

The utility model relates to the technical field of unmanned aerial vehicle power, and discloses a coaxial reverse propeller unmanned aerial vehicle power device which comprises a power device body used for supporting a structure, the power device body is connected with four driving motors through screws, and the power device body is connected with an inner transmission rod and an outer transmission rod through bearings. And the inner transmission rod is rotationally connected to the interior of the outer transmission rod. According to the coaxial reverse propeller unmanned aerial vehicle power device, when a motor rotates, torque is transmitted to a transmission system of an inner transmission rod and an outer transmission rod through a motor extension rod, the inner transmission rod is supported in a power device body through a first set of bearings, and the inner transmission rod is coaxially sleeved with the outer transmission rod; the inner transmission rod and the outer transmission rod rotate reversely through the reverse transmission mechanism, the front propeller and the rear propeller are driven to rotate synchronously in the opposite directions, reverse torque is generated and counteracted, the attitude of the unmanned aerial vehicle is stable, and the problem that an existing reduction gear box is difficult to meet the requirements of diversified application scenes is solved.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) power technology, specifically a coaxial counter-rotating UAV power unit. Background Technology

[0002] With the widespread application of drones in logistics, agriculture, inspection and other fields, the requirements for the efficiency, stability and compactness of the power system are increasing. Coaxial counter-rotating propellers (CCRP) have become one of the mainstream solutions for small drones due to their advantages such as compact structure and torque self-balancing. However, the existing technology still has the following key problems:

[0003] The existing drone structure has the following problems: the dual-motor stacking design results in an excessively large axial dimension, which affects the drone's maneuverability; the existing reduction gearbox is relatively simple in function and cannot meet the needs of diverse application scenarios, such as the inability to flexibly adjust torque and speed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a coaxial counter-rotating unmanned aerial vehicle (UAV) power unit to solve the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a coaxial counter-rotating unmanned aerial vehicle (UAV) power unit, characterized in that it comprises:

[0006] The main body of the power unit is used to support the structure, and the main body of the power unit is connected to four drive motors by screws;

[0007] A coupling and a motor extension rod are used to transmit the power generated by the drive motor, which is connected to the motor extension rod via the coupling;

[0008] A bearing is used to support the motor extension rod, which is connected to the main body of the power unit via the bearing. The bearing is located inside the main body of the unit.

[0009] The inner and outer drive rods are used to transmit power. The main body of the power unit is connected to the inner and outer drive rods through bearings. The inner drive rod is rotatably connected inside the outer drive rod.

[0010] The front propeller and the rear propeller are used to convert rotational power into propulsion. The inner drive rod is fixedly connected to the front propeller by a propeller fixing nut, and the outer drive rod is fixedly connected to the rear propeller by a propeller fixing nut.

[0011] Preferred options also include:

[0012] The rear drive gear is used to transmit power, and the rear drive gear is fixedly sleeved on the inner drive rod;

[0013] Two rear drive gears are used to mesh with the rear transmission gears. The rear transmission gears are meshed and connected together with the two rear drive gears. The rear drive gears are fixedly connected to the motor extension rod.

[0014] Preferred options also include:

[0015] A front drive gear is used to transmit power, and the front drive gear is fixedly connected to the outer drive rod;

[0016] Two front drive gears are used to mesh with the front transmission gear. The front transmission gear is meshed and connected with the two front drive gears. The front drive gear is fixedly connected to the motor extension rod.

[0017] Preferably, the outer drive rod is hollow inside, and the inner drive rod passes through the interior of the outer drive rod. There is a gap between the inner drive rod and the outer drive rod, and the inner drive rod and the outer drive rod do not contact each other. The inner drive rod and the outer drive rod rotate coaxially and in opposite directions.

[0018] Preferably, the propeller fixing nut is a self-locking nut.

[0019] Preferably, the front drive gear, the front transmission gear, the rear drive gear, and the rear transmission gear are all spur gears, and all have the same module.

[0020] Preferably, the sum of the moments of inertia of the front drive gear, the outer drive rod, and the rear propeller is equal to the sum of the moments of inertia of the rear drive gear, the inner drive rod, and the front propeller.

[0021] Preferably, the front propeller and the rear propeller have the same dimensions and number of blades, but rotate in opposite directions.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. The coaxial counter-rotating propeller UAV power unit transmits torque to the inner and outer transmission rods via the motor extension rod when the motor rotates. The inner transmission rod is supported inside the main body of the power unit by the first set of bearings, and the outer transmission rod is coaxially sleeved outside the inner transmission rod. The inner and outer transmission rods rotate in opposite directions through a reverse transmission mechanism, driving the front propeller and the rear propeller to rotate synchronously in opposite directions. The resulting reverse torque cancels each other out, achieving attitude stability for the UAV and solving the problem that existing reduction gearboxes cannot meet the needs of diverse application scenarios.

[0024] 2. The coaxial counter-rotating UAV power unit provides yaw control torque through coaxial dual-propeller differential adjustment. The bearing assembly adopts a combination of angular contact bearings and deep groove ball bearings, which simultaneously bears the radial load and axial thrust of the motor extension rod and the inner and outer transmission rods, ensuring concentricity stability during high-speed reverse downward rotation. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the present utility model;

[0026] Figure 2 This is a front sectional view of the structure of this utility model;

[0027] Figure 3 This is a front sectional view of the main body of the power device of this utility model;

[0028] Figure 4 This is a three-dimensional schematic diagram of the internal transmission rod and related structures of this utility model;

[0029] Figure 5 This is a three-dimensional schematic diagram of the drive motor and related structures of this utility model.

[0030] In the diagram: 1. Main body of the power unit; 2. Front propeller; 3. Rear propeller; 4. Drive motor; 5. Front drive gear; 6. Front transmission gear; 7. Rear drive gear; 8. Rear transmission gear; 9. Inner transmission rod; 10. Outer transmission rod; 11. Bearing; 12. Coupling; 13. Motor extension rod; 14. Propeller fixing bolt. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example:

[0033] Please refer to Figures 1-5.

[0034] A coaxial counter-rotating unmanned aerial vehicle (UAV) power unit includes:

[0035] The main body 1 of the power unit is used to support the structure. The main body 1 of the power unit is connected to four drive motors 4 by screws.

[0036] The coupling 12 and the motor extension rod 13 are used to transmit the power generated by the drive motor 4. The motor is connected to the motor extension rod 13 through the coupling 12.

[0037] Bearing 11 is used to support motor extension rod 13. Motor extension rod 13 is connected to power unit body 1 through bearing 11. Bearing 11 is located inside the device body.

[0038] The inner drive rod 9 and the outer drive rod 10 are used to transmit power. The main body 1 of the power unit is connected to the inner drive rod 9 and the outer drive rod 10 through the bearing 11. The inner drive rod 9 is rotatably connected inside the outer drive rod 10.

[0039] The front propeller 2 and the rear propeller 3 are used to convert rotational power into propulsion. The inner drive rod 9 is fixedly connected to the front propeller 2 by a propeller fixing nut, and the outer drive rod 10 is fixedly connected to the rear propeller 3 by a propeller fixing nut.

[0040] Specifically:

[0041] Power input phase:

[0042] The four drive motors 4 are symmetrically arranged around the power unit body 1. The motor output shaft is rigidly connected to the motor extension rod 13 through the coupling 12. When the motor rotates, the torque is transmitted to the transmission system of the inner transmission rod 9 and the outer transmission rod 10 through the motor extension rod 13.

[0043] Dual-channel power transmission:

[0044] Internal transmission channel: The internal transmission rod 9 is supported inside the power unit body 1 by the first set of bearings 11, and its top end is rigidly connected to the front propeller 2 by the propeller fixing nut, forming an internal power transmission path;

[0045] External transmission channel: The external transmission rod 10 is coaxially sleeved outside the inner transmission rod 9, and forms a rotating pair with the power unit body 1 through the second set of bearings 11. Its end is connected to the rear propeller 3 through the propeller fixing nut, forming the outer power transmission path;

[0046] Coaxial counter-rotating propeller motion generation:

[0047] The inner transmission rod 9 and the outer transmission rod 10 achieve opposite rotation through a reverse transmission mechanism, driving the front propeller 2 and the rear propeller 3 to rotate synchronously in opposite directions, generating reverse torques that cancel each other out, thus achieving attitude stability of the UAV.

[0048] Thrust synthesis control:

[0049] By independently adjusting the speed of the four drive motors 4, the torque distribution ratio of the inner and outer transmission rods 10 is controlled, thereby changing the lift difference between the front and rear propellers 3 and realizing the pitch / roll control of the UAV; the coaxial dual propeller differential adjustment provides yaw control torque;

[0050] Dynamic support system:

[0051] The bearing group 11 adopts a combination of angular contact bearing 11 and deep groove ball bearing 11, which simultaneously bears the radial load and axial thrust of the motor extension rod 13 and the inner and outer transmission rods 10, ensuring the concentricity stability during high-speed reverse downward rotation, and solving the problem that existing reduction gearboxes cannot meet the needs of diverse application scenarios.

[0052] In the embodiment, it also includes:

[0053] The rear drive gear 8 is used to transmit power, and the rear drive gear 8 is fixedly sleeved on the inner drive rod 9;

[0054] Two rear drive gears 7 are used to mesh with the rear transmission gear 8. The rear transmission gear 8 is meshed and connected with the two rear drive gears 7. The rear drive gears 7 are fixedly connected to the motor extension rod 13.

[0055] In the embodiment, it also includes:

[0056] The front drive gear 6 is used to transmit power, and the front drive gear 6 is fixedly connected to the outer drive rod 10.

[0057] Two front drive gears 5 are used to mesh with the front transmission gear 6. The front transmission gear 6 is meshed and connected with the two front drive gears 5. The front drive gears 5 are fixedly connected to the motor extension rod 13.

[0058] In the embodiment: the interior of the outer transmission rod 10 is hollow, and the inner transmission rod 9 is disposed through the interior of the outer transmission rod 10. There is a gap between the inner transmission rod 9 and the outer transmission rod 10. The inner transmission rod 9 and the outer transmission rod 10 do not contact each other. The inner transmission rod 9 and the outer transmission rod 10 rotate coaxially and in opposite directions.

[0059] In this embodiment: the propeller fixing nut is a self-locking nut;

[0060] In the embodiment: the front drive gear 5, the front transmission gear 6, the rear drive gear 7, and the rear transmission gear 8 are all spur gears, and all have the same module;

[0061] In the embodiment: the sum of the moments of inertia of the front drive gear 6, the outer drive rod 10 and the rear propeller 3 is equal to the sum of the moments of inertia of the rear drive gear 8, the inner drive rod 9 and the front propeller 2.

[0062] In the embodiment: the front propeller 2 and the rear propeller 3 have the same dimensions and number of blades, but rotate in opposite directions;

[0063] Specifically, when the current propeller 2 and the rear propeller 3 rotate in opposite directions, that is, one rotates clockwise and the other rotates counterclockwise, a series of unique aerodynamic or hydrodynamic effects will be produced.

[0064] Working principle: When the motor rotates, the torque is transmitted to the transmission system of the inner transmission rod 9 and the outer transmission rod 10 through the motor extension rod 13. The inner transmission rod 9 is supported inside the main body 1 of the power unit by the first set of bearings 11. The outer transmission rod 10 is coaxially sleeved outside the inner transmission rod 9. The inner transmission rod 9 and the outer transmission rod 10 achieve opposite rotation through the reverse transmission mechanism, driving the front propeller 2 and the rear propeller 3 to rotate synchronously in opposite directions, generating reverse torques that cancel each other out, thus stabilizing the attitude of the UAV.

[0065] By independently adjusting the speed of the four drive motors 4, the torque distribution ratio of the inner and outer transmission rods 10 is controlled, thereby changing the lift difference between the front and rear propellers 3, which solves the problem that existing reduction gearboxes cannot meet the needs of diverse application scenarios.

[0066] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coaxial counter-rotating unmanned aerial vehicle (UAV) power unit, characterized in that, include: The main body (1) of the power unit is used to support the structure, and the main body (1) is connected to four drive motors (4) by screws. A coupling (12) and a motor extension rod (13) are used to transmit the power generated by the drive motor (4), which is connected to the motor extension rod (13) via the coupling (12); A bearing (11) is used to support a motor extension rod (13), which is connected to the main body (1) of the power unit via the bearing (11). The bearing (11) is located inside the main body of the device. The inner drive rod (9) and the outer drive rod (10) are used to transmit power. The main body (1) of the power device is connected to the inner drive rod (9) and the outer drive rod (10) through the bearing (11). The inner drive rod (9) is rotatably connected inside the outer drive rod (10). The front propeller (2) and the rear propeller (3) are used to convert rotational power into propulsion. The inner drive rod (9) is fixedly connected to the front propeller (2) by a propeller fixing nut, and the outer drive rod (10) is fixedly connected to the rear propeller (3) by a propeller fixing nut.

2. The coaxial counter-rotating unmanned aerial vehicle (UAV) power unit according to claim 1, characterized in that, Also includes: The rear transmission gear (8) is used to transmit power, and the rear transmission gear (8) is fixedly sleeved on the inner transmission rod (9). Two rear drive gears (7) are used to mesh with a rear transmission gear (8), the rear transmission gear (8) is meshed with the two rear drive gears (7), and the rear drive gears (7) are fixedly connected to the motor extension rod (13).

3. The coaxial counter-rotating unmanned aerial vehicle (UAV) power unit according to claim 1, characterized in that, Also includes: The front drive gear (6) is used to transmit power, and the front drive gear (6) is fixedly connected to the outer drive rod (10). Two front drive gears (5) are used to mesh with the front transmission gear (6), the front transmission gear (6) is meshed with the two front drive gears (5), and the front drive gear (5) is fixedly connected to the motor extension rod (13).

4. The coaxial counter-rotating unmanned aerial vehicle (UAV) power unit according to claim 1, characterized in that: The outer transmission rod (10) is hollow inside, and the inner transmission rod (9) is installed inside the outer transmission rod (10). There is a gap between the inner transmission rod (9) and the outer transmission rod (10). The inner transmission rod (9) and the outer transmission rod (10) do not contact each other. The inner transmission rod (9) and the outer transmission rod (10) rotate coaxially and in opposite directions.

5. A coaxial counter-rotating unmanned aerial vehicle (UAV) power unit according to claim 1, characterized in that: The propeller fixing nut is a self-locking nut.

6. The coaxial counter-rotating unmanned aerial vehicle power unit according to claim 3, characterized in that: The front drive gear (5), front transmission gear (6), rear drive gear (7) and rear transmission gear (8) are all spur gears, and all have the same module.

7. A coaxial counter-rotating unmanned aerial vehicle (UAV) power unit according to claim 3, characterized in that: The sum of the moments of inertia of the front drive gear (6), the outer drive rod (10), and the rear propeller (3) is equal to the sum of the moments of inertia of the rear drive gear (8), the inner drive rod (9), and the front propeller (2).

8. A coaxial counter-rotating unmanned aerial vehicle (UAV) power unit according to claim 1, characterized in that: The front propeller (2) and the rear propeller (3) have the same dimensions and number of blades, but rotate in opposite directions.

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