Transmission system and unmanned aerial vehicle

Abstract

An embodiment of the present invention provides a transmission system and an unmanned aerial vehicle, in which the output end of the inspiration-integrated motor of the transmission system is connected to the first input end of the main reducer; the input end of the inspiration-integrated motor is used to be electrically connected to the controller; the second input end of the main reducer is connected to the output end of the overrunning clutch; the first output end of the main reducer is used to connect to the outer shaft; the second output end is used to connect to the inner shaft, the input end of the overrunning clutch is used to be connected to the output end of the engine, and the input end of the engine is used to be electrically connected to the controller. When the controller determines that the speed output by both the inner shaft and the outer shaft reaches the set speed and the engine starts and reaches the idle speed, the controller controls the inspiration-integrated motor to work in the exit starter mode. When it is determined that the speed reaches the speed corresponding to the engine, or the engine is accelerated to the speed, the inspiration-integrated motor is controlled to work in the generator mode. The application of the transmission system of the embodiment of the present invention can reduce the problem of difficult transmission system layout in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft, and in particular to a transmission system and an unmanned aerial vehicle. Background Art

[0002] At present, existing small drones often use piston or rotor engines as their power source. When the engine is started, the engine speed reaches the idle stage in an instant. In order to prevent the transmission system and rotor system in the drone from being subjected to excessive impact and to reduce the load when the engine is started, the technical means commonly used in the existing technology is to use a centrifugal clutch or a loose transmission belt to disconnect the transmission system from the power chain of the engine; when the power of the engine is large, a centrifugal clutch or a tensioned belt can be used to disconnect the power. However, the centrifugal clutch or loose transmission belt in the existing technology are large, which will inevitably cause the total volume and weight of the entire transmission system to be large, which in turn increases the difficulty of arranging the transmission system on the drone and easily causes the transmission system structure on the drone to be bloated. Summary of the Invention

[0003] An object of the embodiments of the present invention is to provide a transmission system and a UAV, so as to reduce the difficulty of arranging the transmission system in the UAV.

[0004] To achieve the above-mentioned object, in a first aspect, an embodiment of the present invention provides a transmission system, the transmission system comprising: a main reducer, an integrated motor and an overrunning clutch;

[0005] The output end of the inspiration integrated motor is connected to the first input end of the main reducer; the input end of the inspiration integrated motor is used to be electrically connected to the controller;

[0006] The second input end of the main reducer is connected to the output end of the overrunning clutch; the first output end of the main reducer is used to connect to the outer shaft; the second output end is used to connect to the inner shaft, and the inner shaft is built into the outer shaft;

[0007] The input end of the overrunning clutch is used to be connected to the output end of the engine, and the input end of the engine is used to be electrically connected to the controller. When the controller determines that the speed output by both the inner shaft and the outer shaft reaches the set speed and the engine starts and reaches idle speed, the controller controls the integrated starter motor to work in the exit starter mode. When the controller determines that the speed reaches the speed corresponding to the engine, or the engine is accelerated to the speed, the controller controls the integrated starter motor to work in the generator mode.

[0008] In one embodiment of the present invention, the transmission system further includes: an engine.

[0009] In one embodiment of the present invention, the transmission system further includes: a controller.

[0010] In one embodiment of the present invention, the controller is also used to change the generator mode of the initiator to the starter mode after reducing the speed of the engine when it is determined that the engine needs to be shut down. After the change is successful, the engine is shut down and the starter mode of the initiator is changed to the generator mode again, so that the initiator can achieve the function of energy feedback braking.

[0011] In one embodiment of the present invention, the transmission system further comprises: a fixed shaft;

[0012] The fixed shaft is built between the inner shaft and the outer shaft, and one end of the outer side of the fixed shaft is used to fix a fairing, and the other end of the fixed shaft is fixedly mounted on the casing of the main reducer;

[0013] In one embodiment of the present invention, the transmission system further comprises: a fairing;

[0014] A booster or a rotor servo is installed in the fairing, and the rotor servo is used to be connected to the rotor.

[0015] In one embodiment of the present invention, the transmission system further includes a booster or a rotor servo.

[0016] In one embodiment of the present invention, the transmission system further comprises a cable, one end of which is used to connect to an external component, and the other end of which passes through the casing in sequence and is connected to the rotor servo or booster through the gap between the fixed shaft and the external shaft.

[0017] In one embodiment of the present invention, the main reducer includes a driving gear, a first bevel gear, a second bevel gear and a casing;

[0018] Among them, the driving gear is sleeved and installed on the input shaft, and is respectively engaged with the first bevel gear and the second bevel gear; the first bevel gear is sleeved and installed on the inner shaft; the second bevel gear is sleeved and installed on the outer shaft; the driving gear, the first bevel gear and the second bevel gear are all installed in the casing.

[0019] In one embodiment of the present invention, the transmission system further comprises: a battery, wherein the battery is connected to an input terminal of the integrated motor.

[0020] In a second aspect, an embodiment of the present invention provides a drone, comprising: a transmission system and a drone body as described in any of the above embodiments; wherein the transmission system is installed on the drone body.

[0021] An embodiment of the present invention provides a transmission system and an unmanned aerial vehicle (UAV). The output end of the inspiration-integrated motor of the transmission system is connected to the first input end of the main reducer; the input end of the inspiration-integrated motor is used to be electrically connected to a controller; the second input end of the main reducer is connected to the output end of the overrunning clutch; the first output end of the main reducer is used to be connected to the outer shaft; the second output end is used to be connected to the inner shaft; the input end of the overrunning clutch is used to be connected to the output end of the engine, and the input end of the engine is used to be electrically connected to the controller. When the controller determines that the speed output by both the inner shaft and the outer shaft reaches a set speed and the engine starts and reaches idle speed, the controller controls the inspiration-integrated motor to operate in an exit starter mode. When the controller determines that the speed reaches the speed corresponding to the engine or the engine speed is increased to a speed, the inspiration-integrated motor is controlled to operate in a generator mode. Compared with the prior art, the transmission system of the embodiment of the present invention no longer uses a centrifugal clutch or a loose transmission belt, but instead uses an overrunning clutch and an inspiration-integrated motor, both of which are smaller in size and weight. The clever combination of the two not only solves the problem of excessive impact on the transmission system and rotor system of the UAV and reduces the load during engine startup, but also enables the application of the transmission system of the embodiment of the present invention to reduce the problem of difficult transmission system layout in the prior art. Of course, it is not necessary to achieve all of the advantages described above simultaneously in order to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a first transmission system provided by an embodiment of the present invention;

[0024] Figure 2 This is a structural diagram of a second transmission system provided by an embodiment of the present invention.

[0025] 1-main reducer, 2-inspired integrated motor, 3-overrunning clutch, 4-engine, 5-outer shaft, 6-inner shaft, 7-fixed shaft, 8-fairing, 9-booster, 10-cable, 11-battery, 1-1-casing, 1-2-driving gear, 1-3-first bevel gear, 1-4-second bevel gear. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] The present invention is described in detail below through specific examples.

[0028] See also Figure 1 , Figure 1 This is a structural diagram of a first transmission system provided by an embodiment of the present invention, the transmission system comprising: a main reducer 1, an integrated motor 2 and an overrunning clutch 3;

[0029] The output end of the inspiration integrated motor 2 is connected to the first input end of the main reducer 1; the input end of the inspiration integrated motor 2 is used to be electrically connected to the controller;

[0030] The second input end of the final reducer 1 is connected to the output end of the overrunning clutch 3; the first output end of the final reducer 1 is used to connect to the outer shaft 5; the second output end is used to connect to the inner shaft 6, and the inner shaft 6 is built into the outer shaft 5;

[0031] The input end of the overrunning clutch 3 is used to be connected to the output end of the engine 4, and the input end of the engine 4 is used to be electrically connected to the controller. When the controller determines that the speed output by both the inner shaft 6 and the outer shaft 5 reaches the set speed and the engine 4 starts and reaches idle speed, the controller controls the integrated motor 2 to work in the exit starter mode. When it is determined that the speed reaches the speed corresponding to the engine 4, or the engine 4 is accelerated to the speed, the controller controls the integrated motor 2 to work in the generator mode.

[0032] The motors used in the transmission systems of the prior art are often DC motors and AC generators with regulators, and are respectively part of the starting system and the charging system. The production and manufacturing consumes resources, the installation and layout are inconvenient, the required installation space is large, and the failure rate of the components is high. Based on this, this embodiment adopts an integrated motor 2 to solve the problems of the transmission system in the above-mentioned prior art to reduce the volume and weight of the transmission system.

[0033] The final reducer 1 has two input ends and two output ends. The two input ends are respectively used to connect to the inspiration integrated motor 2 and the overrunning clutch 3, so that when the inspiration integrated motor 2 is started, it drives the final reducer 1 to rotate, and then drives the engine 4 to rotate through the overrunning clutch 3. The two output ends are respectively used to connect to the inner shaft 6 and the outer shaft 5, so as to drive the inner shaft 6 and the outer shaft 5 to rotate relatively independently.

[0034] The outer shaft 5 is a hollow shaft, and the inner shaft 6 is placed inside the outer shaft 5. When installed, the outer shaft 5 and the inner shaft 6 are concentric shafts.

[0035] The inner shaft 6 may be a hollow shaft or a solid shaft, which is not limited in this embodiment. In order to reduce the weight of the inner shaft 6 , the inner shaft 6 is generally a hollow shaft.

[0036] An overrunning clutch is a type of clutch that automatically engages and disengages by utilizing changes in speed or rotational direction between the driving and driven components. When the driving component drives the driven component in unison, it's called the engaged state; when the driving and driven components disengage and rotate at their own speeds, it's called the overrunning state. It's a crucial component for transmitting and disconnecting power between the prime mover and the working machine, or between the driving and driven shafts within a machine. It utilizes changes in speed or rotational direction between the driving and driven components to achieve automatic engagement and disengagement.

[0037] An overrunning clutch is a special type of mechanical clutch that automatically engages or disengages in mechanical transmissions based on changes in relative speed or direction of rotation between the driver and the driven component. The driver can only rotate the driven component in a single direction; if the driver changes direction, the driven component automatically disengages and stops transmitting power. This is also known as a one-way clutch or one-way bearing. It is generally selected based on the overrunning speed, hence the general term overrunning clutch.

[0038] Commonly used overrunning clutches 3 include roller overrunning clutches and wedge overrunning clutches.

[0039] A sprag overrunning clutch uses a special-shaped wedge instead of a roller as the wedge element. The wedge and inner and outer raceways form a friction pair. Torque can only be transmitted when there is no relative motion between the inner and outer rings and the wedge, and when the directions and speeds are the same. Otherwise, relative sliding occurs, a sliding state in which no torque is transmitted. Sprag overrunning clutches are primarily available in basic, inner ring-less, and bearing-equipped types. Connection options include key, gear, pulley, sprocket, and bolt connections.

[0040] Roller overrunning clutches are divided into outer and inner star types based on the position of their inner yoke (star). The yoke refers to the conjugate surface between the cylinder and the cylindrical hole, while the star is the component with the groove that accommodates the roller. The inner star type is widely used for ease of machining and guaranteed machining accuracy. Depending on the shape of the star's working surface, it can be divided into three types: flat, logarithmic spiral, and eccentric cylindrical. Flat types are simple to machine and widely used, but their wedge angle does not change with roller wear or contact position, making them more difficult to machine. Eccentric cylindrical types fall between the former two in terms of machining difficulty, performance, and lifespan.

[0041] Based on the above analysis, a sprag overrunning clutch may be selected in this embodiment.

[0042] The overrunning clutch 3 can be installed in the casing 1-1 of the main reducer 1, or can be installed outside the casing 1-1 of the main reducer 1. For ease of installation, in one embodiment of the present invention, the overrunning clutch 3 is installed in the casing 1-1 of the main reducer 1.

[0043] The transmission system of this embodiment may include the engine 4 or may not include the engine 4, and this embodiment is not limited to this.

[0044] The transmission system of this embodiment may include a controller or may not include a controller, and this embodiment is not limited to this.

[0045] The transmission system of this embodiment can be used on aircraft, for example, on drones, on manned aircraft, or on other non-aircraft equipment, but this embodiment does not limit this.

[0046] Furthermore, compared to the prior art, this embodiment eliminates the centrifugal clutch or belt tensioner between the engine 4 and the final reducer 1, replacing it with a compact and lightweight overrunning clutch 3, which is integrated into the final reducer 1. Furthermore, the original single-purpose generator is eliminated, and an integrated electric motor 2 is added to the final reducer 1. This reduces the number of transmission system components, system maintenance, friction parts, and space requirements. This transmission system configuration is ideally suited for unmanned helicopters powered by high-power piston or rotary engines 4.

[0047] When this embodiment is applied to an aircraft, the function of the motor 2 of this embodiment is not only to start the rotation of the rotor mounted on the inner shaft 6, but also to generate electricity.

[0048] When the engine needs to be shut down, in one embodiment of the present invention, the controller is also used to change the generator mode of the initiator 2 to the starter mode after reducing the speed of the engine 4 when it is determined that the engine 4 needs to be shut down. After the change is successful, the engine 4 is shut down and the starter mode of the initiator 2 is changed to the generator mode again, so that the initiator 2 can achieve the function of energy feedback braking.

[0049] When this embodiment is applied to an aircraft, when the aircraft needs to be shut down when landing on the ground, the engine 4 first reduces its speed. During this process, the starter unit 2 is in generator mode. Then the starter unit 2 is changed to starter mode, allowing the engine 4 to rotate with the aircraft's rotor, and then the engine 4 is turned off. Then the starter unit 2 is changed to generator mode, allowing the rotor to decelerate freely. At this time, the generator plays the role of energy feedback braking.

[0050] It can be seen that the technical solution adopted by the controller of this embodiment in determining to shut down the engine 4 can play the role of energy feedback braking, and when the transmission system can work stably, it can achieve rapid shutdown, thereby improving the shutdown efficiency of the transmission system.

[0051] Taking an airplane as an example, the working principle of the transmission system of this embodiment is: during the startup phase of the aircraft, the controller inspires the integrated motor 2 to play the role of starting the aircraft, that is, the controller controls the integrated motor 2 to slowly increase the speed, and drives the rotors of the inner and outer shafts 5 to rotate through the main reducer 1 until the rotor speed exceeds the rotor speed corresponding to the idle speed of the engine 4, and then starts the engine 4 to idle speed, that is, when the rotor speed reaches the set speed and the engine 4 starts and reaches the above-mentioned idle speed, since the rotor speed is greater than the rotor speed corresponding to the idle speed of the engine 4, at this time, the overrunning clutch 3 is in the overrunning state, that is, the overrunning clutch 3 completes the no-load start of the engine 4. After completing the startup of the engine 4, the controller controls the inspiration integrated motor 2 to exit the starter mode. Thereafter, when the rotor speed slowly drops to the speed corresponding to the engine 4, or the engine 4 speeds up to the speed corresponding to the rotor, the overrunning clutch 3 is in the engaged state, and the engine 4 can drive the rotor normally. At this time, the inspiration integrated motor 2 is converted into the generator mode. At the same time, when the controller determines that the engine 4 needs to be shut down, the speed of the engine 4 is reduced, and the generator mode of the inspiration integrated machine 2 is changed to the starter mode. After the change is successful, the engine 4 is turned off and the starter mode of the inspiration integrated machine 2 is changed to the generator mode again, so that the inspiration integrated machine 2 can achieve the function of energy feedback braking.

[0052] It can be seen that the output end of the inspiration integrated motor 2 of the transmission system provided by the embodiment of the present invention is connected to the first input end of the main reducer 1; the input end of the inspiration integrated motor 2 is used to be electrically connected to the controller; the second input end of the main reducer 1 is connected to the output end of the overrunning clutch 3; the first output end of the main reducer 1 is used to connect to the outer shaft 5; the second output end is used to connect to the inner shaft 6, the input end of the overrunning clutch 3 is used to be connected to the output end of the engine 4, and the input end of the engine 4 is used to be electrically connected to the controller. When the controller determines that the speed output by both the inner shaft 6 and the outer shaft 5 reaches the set speed and the engine 4 starts and reaches idle speed, it controls the inspiration integrated motor 2 to connect to the outer shaft 5; the second output end of the main reducer 1 is used to connect to the output end of the overrunning clutch 3; the first output end of the main reducer 1 is used to connect to the outer shaft 5; the second output end is used to connect to the inner shaft 6, the input end of the overrunning clutch 3 is used to connect to the output end of the engine 4, and the input end of the engine 4 is used to be electrically connected to the controller. The machine 2 is in the exit starter mode. When it is determined that the speed reaches the speed corresponding to the engine 4, or the engine 4 is accelerated to the speed, the inspiration integrated motor 2 is controlled to work in the generator mode. Compared with the prior art, the transmission system of the embodiment of the present invention no longer uses a centrifugal clutch or a loose transmission belt, but adopts an overrunning clutch 3 and an inspiration integrated motor with smaller volume and weight. The clever combination of the two not only solves the problem of excessive impact on the transmission system and rotor system of the UAV and reduces the load when the engine 4 is started, but also enables the application of the transmission system of the embodiment of the present invention to reduce the problem of difficult transmission system layout in the prior art.

[0053] In the prior art, since the rotor torque booster 9 or the rotor servo is arranged on the reducer casing 1-1, the space coordination between the transmission system and the control system of the coaxial reverse propeller helicopter is often large in size, and the space between the upper and lower rotors cannot be provided with the torque booster 9 or the rotor servo. Based on this, in one embodiment of the present invention, Figure 2 As shown, the transmission system may further include: a fixed shaft 7;

[0054] The fixed shaft 7 is built between the inner shaft 6 and the outer shaft 5 , and a fairing 8 is fixedly sleeved on one end of the outer side of the fixed shaft 7 , and the other end of the fixed shaft 7 is fixedly mounted on the casing 1 - 1 of the main reducer 1 .

[0055] The fixed shaft 7 is a hollow shaft, and is placed between the outer shaft 5 and the inner shaft 6 , that is, the fixed shaft 7 is installed inside the outer shaft 5 , and the inner shaft 6 is installed inside the fixed shaft 7 , and the three are installed as concentric shafts.

[0056] A fairing 8 is fixedly sleeved on one end portion of the outer side of the fixed shaft 7 to provide support for the fairing 8 and to support the weight of the fairing 8 .

[0057] Control mechanisms can be placed in the fairing 8, and these control mechanisms can be boosters 9 or rotor servos.

[0058] The transmission system may include a fairing 8 or may not include a fairing 8, and this embodiment does not limit this.

[0059] When the transmission system includes a fairing 8, a booster 9 or a rotor servo can be installed in the fairing 8, and the rotor servo is used to be connected to the rotor.

[0060] In order to facilitate installation, the operating mechanism can be placed in the transmission system. In one embodiment of the present invention, the transmission system can also include a booster 9 or a rotor servo.

[0061] It can be seen that the transmission system of this embodiment includes a fixed shaft 7, a fixer is built between the inner shaft 6 and the outer shaft 5, and a fairing 8 is fixedly sleeved on one end of the outer side of the fixed shaft 7, and the other end of the fixed shaft 7 is fixedly mounted on the casing 1-1. The installation of the fixer helps to install the fairing 8 between the upper and lower rotors, reducing the space occupied by the fairing 8 on the aircraft, thereby further reducing the complexity of the transmission system layout.

[0062] If the flat cable 10 on the aircraft is exposed to the outside, it is prone to weathering and exposure to the sun, and it also hinders the maintenance of the transmission system. Based on this, in one embodiment of the present invention, the transmission system may also include a flat cable 10, one end of which is used to connect to an external component, and the other end is sequentially passed through the casing 1-1 and connected to the rotor servo or booster 9 through the gap between the fixed shaft and the outer shaft 5.

[0063] The rotor servo or booster 9 is used to connect with the upper and lower rotors on the aircraft and can drive the upper and lower rotors to swing.

[0064] The external element may be a controller, which is electrically connected to the rotor servo or booster 9 via a flat cable 10 , so as to control the upper and lower rotor swings by controlling the rotor servo or booster 9 .

[0065] It can be seen that one end of the cable 10 of this embodiment is used to connect with an external component, and the other end passes through the casing 1-1 in sequence and is connected to the rotor servo or booster 9 through the gap between the fixed shaft and the outer shaft 5. The cable 10 is arranged in the casing 1-1, which avoids weathering and exposure, improves the safety of the cable 10, further improves the service life of the cable 10, and can improve the reliability of the aircraft. The arrangement of the cable 10 in the gap between the inner shaft 6 and the outer shaft 5 can make the cable 10 neat and clear, and facilitate maintenance by maintenance personnel.

[0066] In one embodiment of the present invention, Figure 2 As shown, the main reducer 1 includes a driving gear 1-2, a first bevel gear 1-3, a second bevel gear 1-4 and a casing 1-1;

[0067] Among them, the driving gear 1-2 is sleeved on the input shaft and meshes with the first bevel gear 1-3 and the second bevel gear 1-4 respectively; the first bevel gear 1-3 is sleeved on the inner shaft 6; the second bevel gear 1-4 is sleeved on the outer shaft 5; the driving gear 1-2, the first bevel gear 1-3, and the second bevel gear 1-4 are all installed in the casing 1-1.

[0068] Bevel gears are used to transmit motion and power between two intersecting shafts. In general machinery, the angle between the two shafts of a bevel gear is equal to 90°, but it can also be different. Similar to cylindrical gears, bevel gears have a pitch cone, a tip cone, a root cone, and a base cone.

[0069] Bevel gear transmission features a reduced addendum height at the small end of the teeth, reducing the risk of over-pointing. A larger root radius improves tooth load capacity, tool life, and lubrication. They are generally used in light-load, low-speed applications. Consequently, bevel gears offer numerous advantages, including long life, high load-bearing capacity, strong chemical and corrosion resistance, noise and vibration reduction, light weight, low cost, ease of molding, and excellent lubricity.

[0070] It is worth mentioning that bevel gears can realize the transmission of two perpendicular axes, while general cylindrical gears can only be used for parallel axes.

[0071] It can be seen that the driving gear 1-2 of the final reducer 1 of this embodiment is sleeved on the input shaft and meshes with the first bevel gear 1-3 and the second bevel gear 1-4 respectively; the first bevel gear 1-3 is sleeved on the inner shaft 6; the second bevel gear 1-4 is sleeved on the outer shaft 5; the driving gear 1-2, the first bevel gear 1-3, and the second bevel gear 1-4 are all installed in the casing 1-1. The application of the solution of this embodiment can transmit power smoothly, with low noise and high torque.

[0072] In view of the fact that the power required for starting the integrated motor 2 is relatively small and it also has the function of generating electricity, based on this, in one embodiment of the present invention, the transmission system also includes: a battery 11, and the battery 11 is connected to the input terminal of the integrated motor 2.

[0073] The battery 11 can be integrated with the motor 2, or they can be separate entities and connected by wires.

[0074] The electric motor 2 can also be powered by an AC power supply.

[0075] It can be seen that the battery 11 of the transmission system of this embodiment is connected to the input terminal of the inspiration integrated motor 2, which can provide power for the inspiration integrated motor 2, thereby achieving the function of the inspiration integrated motor 2.

[0076] An embodiment of the present invention further provides a drone, comprising: the transmission system described in any one of the above embodiments and a drone body; wherein the transmission system is installed on the drone body.

[0077] It can be seen that the drone provided by the embodiment of the present invention includes the transmission system and the drone body described in any of the above embodiments; and the transmission system is installed on the drone body. Compared with the prior art, the transmission system of the drone using the embodiment of the present invention no longer uses a centrifugal clutch or a loose transmission belt, but adopts an overrunning clutch 3 and an integrated motor 2 with smaller volume and weight. The clever combination of the two not only solves the problem of excessive impact on the transmission system and rotor system in the drone and reduces the load when the engine 4 is started, but also enables the drone using the embodiment of the present invention to reduce the problem of difficult transmission system layout in the prior art.

[0078] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such a device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the device comprising the element.

[0079] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A transmission system, characterized in that: include: A main reducer (1), an integrated motor (2), an overrunning clutch (3), an engine (4) and a controller; The output end of the inspiration integrated motor (2) is connected to the first input end of the main reducer (1); the input end of the inspiration integrated motor (2) is used to be electrically connected to a controller; The second input end of the main reducer (1) is connected to the output end of the overrunning clutch (3); the first output end of the main reducer (1) is used to connect to the outer shaft (5), and the second output end is used to connect to the inner shaft (6), and the inner shaft (6) is built into the outer shaft (5); The input end of the overrunning clutch (3) is used to be connected to the output end of the engine (4), and the input end of the engine (4) is used to be electrically connected to the controller. The controller controls the inspiration integrated motor (2) to increase the speed, and drives the rotors of the inner shaft (6) and the outer shaft (5) to rotate through the main reducer (1) until the rotor speeds of the inner shaft (6) and the outer shaft (5) exceed the corresponding rotor speeds of the inner shaft (6) and the outer shaft (5) when the engine (4) is idling. Thereafter, the engine (4) is started. When the engine (4) speed reaches the idle speed, the inspiration integrated motor (2) is controlled to operate in the exit starter mode. Thereafter, when the controller determines that the rotor speeds of the inner shaft (6) and the outer shaft (5) drop to the rotor speed corresponding to the engine (4) speed, or when the engine (4) speeds up to the engine speed corresponding to the rotor speeds of the inner shaft (6) and the outer shaft (5), the inspiration integrated motor (2) is controlled to operate in the generator mode. The controller is also used for, when it is determined that the engine (4) needs to be shut down, reducing the rotation speed of the engine (4), changing the generator mode of the inspiration-integrated motor (2) to the starter mode, and after the change is successful, shutting down the engine (4), and again changing the starter mode of the inspiration-integrated motor (2) to the generator mode, so that the inspiration-integrated motor (2) performs energy-feeding braking.

2. The transmission system according to claim 1, characterized in that The transmission system further comprises: a fairing (8); a booster (9) or a rotor servo is installed in the fairing (8).

3. The transmission system according to claim 2, characterized in that: The transmission system further comprises: a fixed shaft (7); the fixed shaft (7) is built between the inner shaft (6) and the outer shaft (5), and the outer end of the fixed shaft (7) is fixedly sleeved with the fairing (8), and the other end of the fixed shaft (7) is fixedly mounted on the casing (1-1) of the main reducer (1).

4. The transmission system according to claim 3, characterized in that: The transmission system further comprises a cable (10), one end of which is used to connect to an external component, and the other end of which sequentially passes through the casing (1-1) and is connected to the rotor servo or booster (9) through the gap between the fixed shaft (7) and the outer shaft (5).

5. The transmission system according to claim 3, characterized in that: The main reducer (1) comprises a driving gear (1-2), a first bevel gear (1-3), a second bevel gear (1-4) and a casing (1-1); wherein the driving gear (1-2) is sleeved and mounted on the input shaft and meshes with the first bevel gear (1-3) and the second bevel gear (1-4) respectively; the first bevel gear (1-3) is sleeved and mounted on the inner shaft (6); the second bevel gear (1-4) is sleeved and mounted on the outer shaft (5); and the driving gear (1-2), the first bevel gear (1-3) and the second bevel gear (1-4) are all mounted in the casing (1-1).

6. The transmission system according to any one of claims 1 to 5, characterized in that: The transmission system further comprises a battery (11), wherein the battery (11) is connected to the input end of the inspiration-integrated motor (2).

7. A drone, characterized in that: The drone comprises: the transmission system according to any one of claims 1 to 6 and a drone body; wherein the transmission system is installed on the drone body.

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