Multi-rotor unmanned aerial vehicle

Abstract

The utility model relates to the field of unmanned aerial vehicles, in particular to a multi-rotor unmanned aerial vehicle which comprises a vehicle body, a driving device is arranged on the vehicle body, the driving device is connected with a main shaft through a first transmission mechanism, and a plurality of second transmission mechanisms are arranged on the main shaft. One end of each second transmission mechanism is connected with the main shaft, the other end of each second transmission mechanism is connected with a rotor assembly, and the first transmission mechanisms and the second transmission mechanisms are synchronous belt transmission mechanisms. Vibration and noise possibly caused by gear transmission are effectively reduced, and meanwhile the maintenance cost of a transmission system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a multi-rotor UAV. Background Technology

[0002] Unmanned aerial vehicles (UAVs) are characterized by their small size, light weight, low cost, flexible operation, and high safety, and can be widely used in fields such as aerial photography, monitoring, search and rescue, and resource exploration.

[0003] Current technology uses a separate electric motor to drive each propeller. However, the working principle of brushless motors in aviation makes it impossible to maintain uniform speed across all motors, and existing manufacturing processes further exacerbate this variation. In current technology, if all motors operate at the same speed or with minimal differences, it greatly benefits the control software used by current flight systems, resulting in the highest overall energy efficiency. However, significant differences in motor speeds increase the burden on the flight control software, leading to lower drone flight efficiency. Furthermore, the high-speed rotation of the rotors generates vibrations, and traditional drone rotors, driven by electric motors, lack effective vibration damping mechanisms, further impacting the drone's efficiency during flight. Utility Model Content

[0004] The purpose of this invention is to address the problem that the rotors of traditional drones are driven by motors, and the connection between the motor and the drone rotor lacks effective shock absorption measures, which affects the flight performance of the drone. This invention provides a multi-rotor drone.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A multi-rotor unmanned aerial vehicle (UAV) includes a fuselage, on which a drive device is provided. The drive device is connected to a main shaft via a first transmission mechanism. The main shaft is provided with a plurality of second transmission mechanisms. Each second transmission mechanism is connected to the main shaft at one end and to a rotor assembly at the other end. Both the first transmission mechanism and the second transmission mechanisms are synchronous belt transmission mechanisms.

[0007] The utility model discloses a kind of multi-rotor unmanned aerial vehicle, first transmission mechanism and second transmission mechanism are provided in the application, and first transmission mechanism and second transmission mechanism are synchronous belt transmission mechanism, the connection of driving device and main shaft is realized by first transmission mechanism, so that driving device can provide power for main shaft by first transmission mechanism when working, the connection of main shaft and rotor assembly is realized by second transmission mechanism, so that the unmanned aerial vehicle can pass through first transmission mechanism by driving mechanism and drive power is transmitted to main shaft, then main shaft and second transmission mechanism are controlled to rotor assembly, the movement of rotor assembly is realized, the multi-rotor unmanned aerial vehicle passes through synchronous belt transmission mechanism, so that power transmission is more stable, effectively reduce the vibration and noise possibly caused by gear transmission, simultaneously reduce the maintenance cost of transmission system.In addition, the setting of first transmission mechanism and second transmission mechanism makes driving device can efficiently transmit power to rotor assembly, improves the response speed and control precision of unmanned aerial vehicle.Compared with traditional direct drive or gear transmission mode, the structure can reduce energy loss while ensuring power output, improve overall operating efficiency.

[0008] As a preferred scheme of the utility model, the first transmission mechanism includes first driving wheel, the first driving wheel is engaged with first synchronous belt, the first driving wheel is connected with first driven wheel through the first synchronous belt, the first driven wheel is sleeved with the main shaft, and the first driven wheel is used to drive the main shaft to rotate.

[0009] Synchronous belt transmission is used between first driving wheel and first driven wheel, which not only can effectively reduce energy loss in transmission process, but also can reduce mechanical friction.

[0010] As a preferred scheme of the utility model, the first driving wheel is connected with the output end of the driving device.

[0011] As a preferred scheme of the utility model, the second transmission mechanism includes second driving wheel, the second driving wheel is engaged with second synchronous belt, the second driving wheel is connected with second driven wheel through the second synchronous belt, and the second driven wheel is used to drive the rotor assembly to rotate.

[0012] By setting second synchronous belt between second driving wheel and second driven wheel, the whole transmission mechanism is synchronous belt transmission mechanism, and due to the characteristics of synchronous belt transmission, the whole mechanism will not appear the problem of slipping in transmission process, ensures the stable rotation of rotor assembly, and due to the buffer of synchronous belt itself, can reduce the vibration generated by rotor when working, improves the stability of unmanned aerial vehicle when flying.

[0013] As a preferred scheme of the utility model, the rotor assembly includes a rotating shaft, one end of the rotating shaft is connected with the second driven wheel, and the other end of the rotating shaft is connected with a rotor part, and the axis of the rotating shaft coincides with the axis of the second driven wheel.

[0014] By setting the axis of the rotating shaft to coincide with the axis of the second driven wheel, when the second driven wheel is driven to rotate, the second synchronous belt can drive the rotating shaft to rotate synchronously, so that the whole rotor assembly rotates.

[0015] As a preferred scheme of the utility model, the rotor part includes a rotor clamp, one end of the rotor clamp is connected with the rotating shaft, and the other end of the rotor clamp is movably connected with a wing piece.

[0016] As a preferred scheme of the utility model, the body is provided with a plurality of pulley sets, each pulley set includes a first fixed pulley, the first fixed pulley is fixedly connected with the upper cover of the body, and each pulley set further includes a second fixed pulley, the second fixed pulley is fixedly installed with the lower cover of the body.

[0017] The pulley axis of the first fixed pulley and the pulley axis of the second fixed pulley in the same pulley set are parallel to each other, and the wheel groove of the first fixed pulley and the wheel groove of the second fixed pulley are symmetrically arranged, and the first fixed pulley and the second fixed pulley are used for clamping the second synchronous belt.

[0018] Since the pulley axes of the first fixed pulley and the second fixed pulley are parallel to each other, and the wheel grooves of the first fixed pulley and the second fixed pulley are symmetrically arranged, the second synchronous belt always maintains a stable stress state during operation, avoiding the problem of uneven transmission caused by the swing or deviation of the synchronous belt, improving the accuracy of power transmission, and through the clamping and guiding of the pulley set on the synchronous belt, the lateral deviation and distortion of the synchronous belt during operation can be effectively reduced, the local wear caused by friction and stress concentration is reduced, the service life of the synchronous belt is prolonged, the maintenance cost is reduced, the pulley set of the clamping structure can effectively reduce the swing and vibration of the synchronous belt during operation, so that the transmission system runs more stably at high speed, thereby reducing vibration and noise, improving the stability of the unmanned aerial vehicle flight, and being suitable for tasks with high noise control requirements, such as inspection, surveying and mapping, and monitoring applications.

[0019] As a preferred scheme of the utility model, the body is connected with the rotor assembly through an arm, and the second synchronous belt is located in the arm.

[0020] As a preferred scheme of the utility model, the arm is a hollow structure, and each arm is provided with a idler set, the idler set is connected with the second synchronous belt, and the idler set is used for realizing the torsion of the second synchronous belt.

[0021] The whole second synchronous belt is twisted by setting the idler group, and the power transmission direction of the second synchronous belt can be changed.

[0022] As a preferred scheme of the utility model, a plurality of bearing seats are arranged in the machine body along the length direction of the main shaft, and each bearing seat is connected with the main shaft sleeve.

[0023] By arranging a plurality of bearing seats in the machine body along the main shaft direction, uniform support can be provided, the overhanging length of the main shaft is reduced, deformation or vibration caused by uneven stress during operation is effectively reduced, and the overall structure is more stable and reliable.

[0024] In summary, due to the adoption of the above technical scheme, the utility model has the beneficial effects that:

[0025] 1. The utility model discloses a multi-rotor unmanned aerial vehicle, a first transmission mechanism and a second transmission mechanism are arranged, and the first transmission mechanism and the second transmission mechanism are synchronous belt transmission mechanisms, the connection between a driving device and a main shaft is realized through the first transmission mechanism, so that the driving device can provide power for the main shaft when working, the connection between the main shaft and a rotor assembly is realized through the second transmission mechanism, so that the unmanned aerial vehicle can transmit driving force to the main shaft through the first transmission mechanism through the driving mechanism, and the rotor assembly is controlled through the main shaft and the second transmission mechanism, the movement of the rotor assembly is realized, the multi-rotor unmanned aerial vehicle adopts the synchronous belt transmission mechanism, so that power transmission is more stable, vibration and noise caused by gear transmission are effectively reduced, and the maintenance cost of the transmission system is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic view of the first transmission mechanism and the second transmission mechanism of the utility model connected with the machine body.

[0027] Figure 2 It is an enlarged view of A of the utility model. Figure 1

[0028] Figure 3 It is an enlarged view of B of the utility model. Figure 1

[0029] Figure 4 It is a structural schematic view of the bearing seat and the main shaft of the utility model connected.

[0030] Figure 5 ​​is a structural schematic view of the first transmission mechanism of the utility model;

[0031] Figure 6 is a structural schematic view of the second transmission mechanism of the utility model;

[0032] Figure 7 is a schematic view of the first transmission mechanism and the second transmission mechanism and the rotor assembly of the utility model

[0033] Figure 8 is the utility model Figure 7 C place enlarged view;

[0034] Figure 9 is a structural schematic view of the multi-rotor unmanned aerial vehicle of the utility model;

[0035] Figure 10 is a structural schematic view of the idler set of the utility model.

[0036] Icon: 1-machine body;11-first fixed pulley;12-second fixed pulley;13-bearing seat;2-driving device;3-main shaft;4-first transmission mechanism;41-first driving wheel;42-first synchronous belt;43-first driven wheel;5-second transmission mechanism;51-second driving wheel;52-second synchronous belt;53-second driven wheel;6-rotor assembly;61-rotating shaft;62-rotor component;621-rotor clamp;622-vane;7-arm;71-idler set;711-fixed frame;712-idler. DETAILED DESCRIPTION

[0037] The utility model will be further described in detail below in combination with specific embodiments. But this should not be understood as the above-mentioned subject matter of the utility model is limited to the following examples, and all the technologies realized based on the content of the utility model belong to the scope of the utility model.

[0038] In the description of the specific embodiments of the utility model, the orientation or position relationship of the terms such as "up", "down", "left", "right", "center", "inner", "outer" and the like appear without special explanation, are based on the orientation or position relationship of the product / equipment / device of the utility model when it is usually used. These orientation or position relationship terms are only for the convenience of describing the utility model scheme or simplifying the description in the specific embodiments, so as to facilitate the quick understanding of the scheme by the technicians, and are not indicative or suggestive of the specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, so it cannot be understood as a limitation of the utility model.

[0039] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "overhanging", "parallel" and the like, and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the utility model scheme.

[0040] In addition, the terms "first", "second", "third" and the like in the description of the utility model embodiments are only used to distinguish the same or similar components, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0041] In addition, in the description of the embodiments of the utility model, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. Any case, it can even be more than 9 cases.

[0042] In addition, in the description of the technical scheme of the utility model, unless otherwise specified / limited / limited, the terms "arrangement", "installation", "connection", "connection", "provided with", "laid", "arrangement" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, such as welding, riveting, bolting, screwing and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements.

[0043] Embodiment 1

[0044] For example, Figure 1 , Figure 5 , Figure 6 and Figure 7The multi-rotor unmanned aerial vehicle shown in the figure comprises a body 1, a driving device 2 arranged on the body 1 and capable of driving a rotor to work, a main shaft 3 arranged in the unmanned aerial vehicle body 1, the main shaft 3 being connected with the driving device 2 through a first transmission mechanism 4, the first transmission mechanism 4 being used for transmitting the driving force of the driving device 2 to the main shaft 3, the main shaft 3 being provided with a plurality of second transmission mechanisms 5 at two ends thereof, and the main shaft 3 being connected with a rotor assembly 6 through the second transmission mechanisms 5, the main shaft 3 being capable of synchronously driving the second transmission mechanisms 5 to work when the main shaft 3 works, so that the rotor assembly 6 rotates under the driving of the second transmission mechanisms 5.

[0045] Further, the first transmission mechanism 4 comprises a first driving wheel 41 connected with the output end of the driving device 2, the first driving wheel 41 being engaged with a first synchronous belt 42, the first transmission mechanism 4 further comprising a first driven wheel 43 engaged with the first synchronous belt 42, so that the first driven wheel 43, the first synchronous belt 42 and the first driving wheel 41 constitute a synchronous belt transmission mechanism, and the first driven wheel 43 is sleeved with the main shaft 3, when the driving device 2 controls the first driving wheel 41 to rotate, the first synchronous belt 42 is driven to work, when the first synchronous belt 42 works, the first driven wheel 43 is synchronously driven to rotate, and since the first driven wheel 43 is sleeved with the main shaft 3, when the first driven wheel 43 rotates, the main shaft 3 is synchronously driven to rotate.

[0046] Further, the second transmission mechanism 5 comprises a second driving wheel 51 engaged with a second synchronous belt 52, the end of the second synchronous belt 52 not engaged with the second driving wheel 51 being provided with a second driven wheel 53, the second driven wheel 53 being connected with the rotor assembly 6, when the main shaft 3 starts to rotate under the action of the first transmission mechanism 4, the second driving wheel 51 is synchronously driven to rotate, the second driving wheel 51 drives the second synchronous belt 52 engaged with itself to work, and the second driven wheel 53 is synchronously driven to work, since the second driven wheel 53 is connected with the rotor assembly 6, when the second driven wheel 53 works, the rotor assembly 6 rotates under the driving of the second driven wheel 53.

[0047] In one or several embodiments, the first synchronous belt 42 is provided with a rack engaged with the first driving wheel 41 and the first driven wheel 43; the second synchronous belt 52 is provided with a rack engaged with the second driving wheel 51 and the second driven wheel 53, so that the first transmission mechanism and the second transmission mechanism are more stable in power transmission.

[0048] In one or more embodiments, the rotor assembly 6 comprises a rotating shaft 61, one end of which is connected with the second driven wheel 53, and the other end of which is connected with a rotor part 62, the axis of the rotating shaft 61 coincides with the axis of the second driven wheel 53, by setting the axis of the rotating shaft 61 to coincide with the axis of the second driven wheel 53 (here the axis of the driven wheel refers to the center line of the rotating motion of the driven wheel, which is also the geometric center line of the driven wheel), so that the second synchronous belt 52 can drive the rotating shaft 61 to rotate when driving the second driven wheel 53 to rotate, thereby making the entire rotor assembly 6 rotate, as shown in Figure 8 .

[0049] In one or more embodiments, the rotor part 62 comprises a rotor clamp 621, one end of which is connected with the rotating shaft 61, and the other end of which is movably connected with a wing piece 622, as shown in Figure 8 .

[0050] In one or more embodiments, the body 1 is provided with a plurality of pulley sets, each of which comprises a first fixed pulley 11, which is fixedly connected with the upper cover of the body 1, and a second fixed pulley 12, which is fixedly installed with the lower cover of the body 1, the pulley axes of the first fixed pulley 11 and the second fixed pulley 12 in the same pulley set are parallel to each other (the pulley axis refers to the center line of the rotating motion of the pulley), and the grooves of the first fixed pulley 11 and the second fixed pulley 12 are symmetrically arranged, the first fixed pulley 11 and the second fixed pulley 12 are used to clamp the second synchronous belt 52, because the pulley axes of the first fixed pulley 11 and the second fixed pulley 12 are parallel to each other, and the grooves of the first fixed pulley 11 and the second fixed pulley 12 are symmetrically arranged, the second synchronous belt 52 always maintains a stable stress state during operation, avoiding the problem of uneven transmission caused by the swinging or deviation of the synchronous belt, improving the accuracy of power transmission, clamping and guiding the synchronous belt through the pulley set, which can effectively reduce the lateral deviation and distortion of the synchronous belt during operation, reduce local wear caused by friction and stress concentration, thereby prolonging the service life of the synchronous belt, reducing maintenance costs, the pulley set of the clamping structure can effectively reduce the swinging and shaking of the synchronous belt during operation, making the transmission system more stable during high-speed operation, thereby reducing vibration and noise, improving the stability of the unmanned aerial vehicle flight, and being suitable for tasks with high noise control requirements, such as inspection, surveying and monitoring applications, as shown in Figure 1 , Figure 2 and Figure 3 .

[0051] In one or more embodiments, the body 1 is connected with the rotor assembly 6 through the arm 7, the second synchronous belt 52 is located in the arm 7, the arm 7 is a hollow structure, and each arm 7 is provided with a idler set 71, the idler set 71 is clamped with the second synchronous belt 52, and the idler set 71 is used to realize the torsion of the second synchronous belt 52. By setting the idler set 71, the entire second synchronous belt 52 is twisted, the power transmission direction of the second synchronous belt 52 can be changed, as shown in Figure 1 and Figure 9 .

[0052] In one or more embodiments, the body 1 is provided with a plurality of bearing seats 13 arranged along the length direction of the main shaft 3, and each bearing seat 13 is sleeved with the main shaft 3. By arranging a plurality of bearing seats 13 along the direction of the main shaft 3 inside the body 1, uniform support can be provided, the overhanging length of the main shaft 3 is reduced, deformation or vibration caused by uneven stress during operation is effectively reduced, and the overall structure is more stable and reliable, as shown in Figure 4 .

[0053] In one or more embodiments, the body 1 is provided with a mounting frame for mounting the driving device 2, which avoids the shaking of the driving device 2 during flight, thereby avoiding the problem of flight failure of the unmanned aerial vehicle.

[0054] In one or more embodiments, the idler set 71 includes two oppositely arranged fixed frames 711, the outer wall of each fixed frame 711 is connected with the inner wall of the arm 7, two idlers 712 are arranged between the two fixed frames 711, the wheel grooves of the two idlers 712 are oppositely arranged, a gap is arranged between the two idlers 712 for the second synchronous belt 52 to pass through, the second synchronous belt 52 is clamped with the wheel grooves of the idlers 712, the second synchronous belt 52 is twisted by the idler set 71, and the meshing relationship between the second synchronous belt 52, the second driving wheel 51 and the second driven wheel 53 is ensured. Such arrangement is because the rotation axes of the second driving wheel 51 and the second driven wheel 53 are different (i.e., the axis of the second driving wheel 51 and the axis of the second driven wheel 53 have an angle), the second synchronous belt 52 needs to be twisted to realize the meshing relationship between the second driving wheel 51 and the second driven wheel 53, and the design of the idler set 71 not only ensures the stable transmission of the second synchronous belt 52 in the twisted state, but also effectively reduces the belt body wear and stress concentration caused by twisting. The wheel grooves of the two idlers 712 are oppositely arranged, so that the second synchronous belt 52 can be accurately guided and positioned when passing through the gap, avoiding the deviation or off-slot phenomenon in the twisting process. At the same time, the connection structure of the fixed frame 711 and the inner wall of the arm 7 further enhances the rigidity and stability of the entire idler set 71, ensuring that it can withstand the tension and torque transmitted by the second synchronous belt 52 during long-term operation, as shown in Figure 10 .

[0055] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-rotor unmanned aerial vehicle (UAV), comprising a fuselage (1), characterized in that, The body (1) is provided with a drive device (2), which is connected to the main shaft (3) through a first transmission mechanism (4). The main shaft (3) is provided with a plurality of second transmission mechanisms (5), each of which is connected to the main shaft (3) at one end and to a rotor assembly (6) at the other end. Both the first transmission mechanism (4) and the second transmission mechanism (5) are synchronous belt transmission mechanisms.

2. The multi-rotor unmanned aerial vehicle according to claim 1, characterized in that, The first transmission mechanism (4) includes a first driving wheel (41), on which a first synchronous belt (42) meshes. The first driving wheel (41) is connected to a first driven wheel (43) through the first synchronous belt (42). The first driven wheel (43) is sleeved with the main shaft (3). The first driven wheel (43) is used to drive the main shaft (3) to rotate.

3. A multi-rotor unmanned aerial vehicle according to claim 2, characterized in that, The first drive wheel (41) is connected to the output end of the drive device (2).

4. A multi-rotor unmanned aerial vehicle according to claim 3, characterized in that, The second transmission mechanism (5) includes a second drive wheel (51), which meshes with a second synchronous belt (52). The second drive wheel (51) is connected to a second driven wheel (53) via the second synchronous belt (52). The second driven wheel (53) is used to drive the rotor assembly (6) to rotate.

5. A multi-rotor unmanned aerial vehicle according to claim 4, characterized in that, The rotor assembly (6) includes a rotating shaft (61), one end of which is connected to the second driven wheel (53) and the other end is connected to a rotor component (62). The axis of the rotating shaft (61) coincides with the axis of the second driven wheel (53).

6. A multi-rotor unmanned aerial vehicle according to claim 5, characterized in that, The rotor component (62) includes a rotor clip (621), one end of which is connected to the rotating shaft (61), and the other end is movably connected to a blade (622).

7. A multi-rotor unmanned aerial vehicle according to claim 6, characterized in that, The machine body (1) is provided with a plurality of pulley groups. Each pulley group includes a first fixed pulley (11), which is fixedly connected to the upper cover of the machine body (1). Each pulley group also includes a second fixed pulley (12), which is fixedly installed to the lower cover of the machine body (1). The pulley axis of the first fixed pulley (11) in the same pulley group is parallel to the pulley axis of the second fixed pulley (12), and the groove of the first fixed pulley (11) and the groove of the second fixed pulley (12) are symmetrically arranged. The first fixed pulley (11) and the second fixed pulley (12) are used to clamp the second synchronous belt (52).

8. A multi-rotor unmanned aerial vehicle according to claim 7, characterized in that, The fuselage (1) is connected to the rotor assembly (6) via an arm (7), and the second synchronous belt (52) is located inside the arm (7).

9. A multi-rotor unmanned aerial vehicle according to claim 8, characterized in that, The arm (7) is a hollow structure, and each arm (7) is provided with an idler wheel group (71). The idler wheel group (71) is engaged with the second synchronous belt (52). The idler wheel group (71) is used to realize the twisting of the second synchronous belt (52).

10. A multi-rotor unmanned aerial vehicle according to any one of claims 1-9, characterized in that, The machine body (1) is provided with a plurality of bearing seats (13), the bearing seats (13) are arranged along the length direction of the main shaft (3), and each bearing seat (13) is sleeved with the main shaft (3).

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