Belt transmission structure and chain transmission structure for unmanned aerial vehicle

Abstract

The invention relates to a belt transmission structure and a chain transmission structure for an unmanned aerial vehicle, belongs to the technical field of unmanned aerial vehicles, and solves the problems that in the prior art, a transmission mechanism of an unmanned aerial vehicle needs to be specially provided with a tensioning wheel besides a driving wheel and a driven wheel, so that the space occupied by the transmission mechanism is large, and the body space of the unmanned aerial vehicle is wasted. The device is composed of a driving wheel, a driven unit, a transmission belt and a fixing unit, the driving wheel is connected with an output shaft of an engine of the unmanned aerial vehicle, and the transmission belt is used for connecting the driving wheel with the driven unit, so that rotation of the driving wheel is transmitted to the driven unit; and the first driven wheel and the fixing unit are used for connecting the driven unit with the body of the unmanned aerial vehicle. The transmission belt only needs to be connected with the driving wheel and the first driven wheel of the driven assembly, the tensioning degree of the transmission belt can be adjusted through the distance adjusting assembly arranged on the driven assembly in a sleeving mode, and a tensioning wheel which is independently and specially arranged is omitted.

Description

Technical Field

[0001] The present invention belongs to the technical field of unmanned aerial vehicles (UAVs), and in particular relates to a belt transmission structure and a chain transmission structure for UAVs. Background Art

[0002] Belt drives are widely used in current drones, including synchronous belts, V-belts, multi-belts, and tandem belts. For example, these are used in the main drive system and generator drive mechanism. The main drive system of unmanned helicopters and small manned helicopters typically consists of a primary belt drive and a primary speed reducer. The piston engine is connected to the belt drive mechanism, and power is transmitted to the speed reducer through the primary belt drive mechanism. The generator is typically driven directly by the primary belt drive.

[0003] Belt drives used on drones require tensioning, and the typical approach is to place a tensioner on the drive belt. The drawback of this approach is that the drive mechanism, consisting of a driving pulley, a first driven pulley, and a tensioner, requires at least three wheels. The tensioner itself is relatively large in diameter, requiring internal bearings and a shaft. It must also be secured to the frame via a mechanism, and the position of the tensioner must be adjustable to maintain belt tension. This further increases the space and weight of the belt drive, wasting space within the drone and reducing its payload. Summary of the Invention

[0004] In view of the above analysis, an embodiment of the present invention aims to provide a belt transmission structure for a drone, so as to solve the problem that the drone transmission mechanism in the prior art requires a special tensioning pulley in addition to the driving pulley and the driven pulley, resulting in a large space occupation of the belt transmission mechanism and a waste of the drone body space.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] A belt drive structure for an unmanned aerial vehicle (UAV) comprises a driving wheel, a driven unit, a transmission belt, and a fixing unit. The driving wheel is connected to the output shaft of the UAV's engine. The transmission belt is used to connect the driving wheel and the driven unit so as to transmit the rotation of the driving wheel to the driven unit. The fixing unit of the first driven wheel is used to connect the driven unit to the body of the UAV. The driven unit can both rotate outward to perform work and be used to adjust the tension of the transmission belt.

[0007] Furthermore, the driven unit is composed of a driven component and a distance-adjusting component, the distance-adjusting component is sleeved on the driven component, the transmission belt can be set on the driving wheel and the driven component to transmit the rotation of the driving wheel to the driven component, and the distance-adjusting component is used to adjust the distance between the driving wheel and the driven component, thereby adjusting the tension of the transmission belt.

[0008] Furthermore, the driven assembly includes a first driven wheel and a driven shaft, the first driven wheel is arranged at one end of the driven shaft, and the first driven wheel is coaxial with the driven shaft; the transmission belt can be connected to the first driven wheel and transmit the rotation of the driving wheel to the first driven wheel.

[0009] Furthermore, the distance adjustment assembly includes a first eccentric sleeve, which is sleeved on the driven shaft and can be rotatably connected to the fixing unit.

[0010] Furthermore, the central axis of the driving wheel and the central axis of the driven shaft are parallel to the central axis of the first eccentric sleeve, but are not coaxial; circumferential rotation of the first eccentric sleeve can cause the driven shaft to rotate around the central axis of the first eccentric sleeve, thereby changing the wheelbase between the first driven wheel and the driving wheel.

[0011] Furthermore, the distance adjustment assembly further includes a first bearing, and the first bearing is arranged between the first eccentric sleeve and the driven shaft.

[0012] Furthermore, the fixing unit includes a locking sleeve, and the locking sleeve includes a first fixing portion, a second fixing portion and a diameter-changing portion.

[0013] Furthermore, the diameter reducing portion is a cylindrical diameter reducing portion with a side opening, and the diameter reducing portion is used to clamp the first eccentric sleeve.

[0014] Furthermore, the first fixing portion and the second fixing portion are respectively arranged on the side walls of the diameter-reducing portion on both sides of the side opening; the first fixing portion is used to be connected to the machine body.

[0015] A chain transmission structure for a drone comprises a driving gear, a transmission chain, a driven unit and a fixing unit.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] (1) The driven unit of the belt transmission structure for a drone of the present invention includes a driven component and a pitch-adjusting component. The pitch-adjusting component is sleeved on the driven component. The transmission belt can be set on the driving wheel and the driven component to transmit the rotation of the driving wheel to the driven component. The pitch-adjusting component is used to adjust the distance between the driving wheel and the driven component, thereby adjusting the tension of the transmission belt. The transmission belt is not connected to the tensioning wheel in the prior art, but is only connected to the driving wheel and the first driven wheel of the driven component, a total of two wheels. The tension of the transmission belt can be adjusted by the pitch-adjusting component sleeved on the driven component, eliminating the tensioning wheel in the prior art. The transmission structure of the present invention occupies little space in the drone, saving the body space of the drone.

[0018] (2) The central axis of the driving wheel and the central axis of the driven shaft of the present invention are parallel to the central axis of the first eccentric sleeve, but are not coaxial; the first eccentric sleeve of the circumferentially rotating pitch adjustment assembly can cause the driven shaft to rotate around the central axis of the first eccentric sleeve, thereby changing the wheelbase between the first driven wheel and the driving wheel, thereby achieving the purpose of adjusting the tension of the transmission belt;

[0019] (3) The rotation of the driving wheel of the present invention can be transmitted to the second driven wheel through the transmission belt, and then transmitted to the driven gear through the transmission teeth, thereby driving the driven shaft to rotate, thereby achieving the purpose of transmission from the driving wheel to the driven shaft;

[0020] (4) The central axis of the driving wheel and the central axis of the driven shaft of the present invention are parallel to the central axis of the second eccentric sleeve, but are not coaxial; circumferential rotation of the second eccentric sleeve can cause the second driven wheel to rotate around the central axis of the driven shaft and the fixed cylinder, thereby changing the wheelbase between the second driven wheel and the driving wheel, thereby achieving the purpose of adjusting the tension of the transmission belt without changing the position of the driven shaft;

[0021] (5) The connecting rod of the present invention can be inserted into the pin hole and rotated in the pin hole; the locking gear can be connected to the gear portion, and rotating the transmission rod can drive the locking gear and the gear portion and cause the second eccentric sleeve to rotate circumferentially around the fixed cylinder;

[0022] (6) When the transmission rod of the present invention is pressed down, the connecting rod can press the fixing pin into the pin hole, and the connecting rod can be connected to the pin hole, the locking gear can be connected to the gear part, and the second eccentric sleeve can be rotated circumferentially around the fixed cylinder; when the transmission rod is pulled out, the fixing pin spring can push the fixing pin out of the pin hole, the ridge can be connected to the fixing groove, and the end of the fixing pin is still in the pin hole, thereby preventing the second eccentric sleeve from rotating circumferentially. The locking unit can not only make the second eccentric sleeve rotate circumferentially around the fixed cylinder, thereby adjusting the tension of the transmission belt, but also cooperate with the fixing pin to unlock or lock the second eccentric sleeve.

[0023] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following content, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained as particularly pointed out in the text and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0025] Figure 1 It is the overall structural diagram of the transmission structure;

[0026] Figure 2 Schematic diagram of the overall structure of the driven unit of Example 1;

[0027] Figure 3 Schematic diagram of the overall structure of the driven unit of Example 2;

[0028] Figure 4 Schematic diagram of the exploded structure of the driven unit of Example 2;

[0029] Figure 5 It is a schematic diagram of the overall structure of the second eccentric sleeve.

[0030] Reference numerals:

[0031] 1-driving wheel; 2-driven unit; 3-transmission belt; 4-fixing unit; 5-locking unit; 21-first driven wheel; 22-driven shaft; 23-first eccentric sleeve; 24-rib; 25-driven gear; 26-second eccentric sleeve; 27-second driven wheel; 28-gear part; 29-fixing groove; 41-locking sleeve; 42-locking bolt; 43-fixing cylinder; 44-pin hole; 45-fixing pin; 46-fixing pin spring; 51-locking gear; 52-connecting rod; 53-transmission rod; 100-machine body. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0033] Example 1:

[0034] A specific embodiment of the present invention, as Figure 1 As shown, a belt transmission structure for a UAV (hereinafter referred to as the transmission structure) is disclosed, including a driving wheel 1, a driven unit 2, a transmission belt 3 and a fixing unit 4. The driving wheel 1 is connected to the output shaft of the UAV engine. The transmission belt 3 is used to connect the driving wheel 1 and the driven unit 2 so that the rotation of the driving wheel 1 is transmitted to the driven unit 2. The first driven wheel fixing unit 4 is used to connect the driven unit 2 to the body 100 of the UAV. The driven unit 2 can replace the tensioning wheel, can do work externally, and is used to adjust the tension of the transmission belt 3.

[0035] Preferably, the driven unit 2 includes a driven assembly and a pitch-adjusting assembly, the pitch-adjusting assembly being sleeved on the driven assembly. The transmission belt 3 can be disposed on the driving wheel 1 and the driven assembly to transmit the rotation of the driving wheel 1 to the driven assembly. The pitch-adjusting assembly is used to adjust the distance between the driving wheel 1 and the driven assembly, thereby adjusting the tension of the transmission belt 3. Compared to the transmission mechanism of the prior art, which requires three wheels, the transmission belt 3 of this embodiment only needs to be connected to the driving wheel 1 and the driven assembly, respectively, for a total of two wheels. The tension of the transmission belt 3 can be adjusted by the pitch-adjusting assembly sleeved on the driven assembly, eliminating the tensioning pulley. The transmission structure of this embodiment occupies less space in the drone, saving space in the drone body.

[0036] Preferably, Figure 2 As shown, the driven assembly includes a first driven wheel 21 and a driven shaft 22. The first driven wheel 21 is arranged at one end of the driven shaft 22 and is coaxial with the driven shaft 22. The transmission belt 3 can be connected to the first driven wheel 21 and transmit the rotation of the driving wheel 1 to the first driven wheel 21.

[0037] Preferably, the pitch adjustment assembly includes a first eccentric sleeve 23, which is mounted on the driven shaft 22 and rotatably connected to the fixed unit 4. The central axis of the driving pulley 1, the central axis of the driven shaft 22, and the central axis of the first eccentric sleeve 23 are parallel, but not coaxial. Circumferential rotation of the first eccentric sleeve 23 causes the driven shaft 22 to rotate about the central axis of the first eccentric sleeve 23, thereby changing the wheelbase between the first driven pulley 21 and the driving pulley 1, thereby adjusting the tension of the transmission belt 3.

[0038] Preferably, the distance adjustment assembly also includes a first bearing (not shown in the figure), which is arranged between the first eccentric sleeve 23 and the driven shaft 22. The first bearing is used to reduce the friction between the first eccentric sleeve 23 and the driven shaft 22, and prevent the driven shaft 22 from axially disengaging from the first eccentric sleeve 23.

[0039] Preferably, Figure 1 As shown, the fixing unit 4 includes a locking sleeve 41, which comprises a first fixing portion, a second fixing portion, and a reducing portion. The reducing portion is a cylindrical reducing portion with a side opening, which is used to enclose the first eccentric sleeve 23. The first and second fixing portions are respectively disposed on the side walls of the side opening of the reducing portion. The first fixing portion is used to connect to the machine body 100.

[0040] Preferably, in order to enable the reducing portion to clamp and secure the first eccentric sleeve 23, the fixing unit 4 further includes a locking bolt 42. The locking bolt 42 is used to change the spacing between the first and second fixing portions, thereby adjusting the degree of clamping between the reducing portion and the first eccentric sleeve 23. Loosening the locking bolt 42 allows the first eccentric sleeve 23 to rotate within the locking sleeve 41, thereby adjusting the wheelbase between the first driven wheel 21 and the driving wheel 1. Tightening the locking bolt 42 allows the reducing portion to clamp the first eccentric sleeve 23, preventing the first eccentric sleeve 23 from rotating within the locking sleeve 41, thereby ensuring that the wheelbase between the first driven wheel 21 and the driving wheel 1 remains unchanged.

[0041] Preferably, Figure 2 As shown, in order to circumferentially rotate the first eccentric sleeve 23, the distance adjustment assembly further includes a rib 24, which is provided at one end of the first eccentric sleeve 23. The rib 24 can be rotated with a wrench to cause the first eccentric sleeve 23 to circumferentially rotate. The rib 24 is a hexagonal rib.

[0042] Compared with the prior art, the driven unit 2 includes a driven component and a pitch-adjusting component, which is sleeved on the driven component. The transmission belt 3 can be set on the driving wheel 1 and the driven component to transmit the rotation of the driving wheel 1 to the driven component. The pitch-adjusting component is used to adjust the distance between the driving wheel 1 and the driven component, thereby adjusting the tension of the transmission belt 3; the transmission belt 3 of this embodiment only needs to be connected to the driving wheel 1 and the first driven wheel 21 of the driven component respectively, a total of two wheels, and the tension of the transmission belt 3 can be adjusted by the pitch-adjusting component sleeved on the driven component, eliminating the tensioning wheel of the prior art. The transmission structure of this embodiment occupies little space in the drone, saving the body space of the drone; the central axis of the driving wheel 1 and the central axis of the driven shaft 22 are parallel to the central axis of the first eccentric sleeve 23, but are not coaxial; circumferential rotation of the first eccentric sleeve 23 can cause the driven shaft 22 to rotate around the central axis of the first eccentric sleeve 23, thereby changing the wheelbase of the first driven wheel 21 and the driving wheel 1, thereby achieving the purpose of adjusting the tension of the transmission belt 3.

[0043] Example 2:

[0044] In Example 1, to change the wheelbase between the first driven wheel 21 and the driving wheel 1, and thereby adjust the tension of the transmission belt 3, it is necessary to rotate the first eccentric sleeve 23 circumferentially, causing the first driven wheel 21 to rotate about the central axis of the first eccentric sleeve 23. In other words, the position of the first driven wheel 21 and the driven shaft 22 is variable, which cannot meet the requirements of some drone models for a fixed position of the driven shaft 22.

[0045] Another specific embodiment of the present invention is as follows Figure 3As shown, in order to fix the output position of the driven shaft 22, on the basis of Example 1, the driven unit 2 is improved by eliminating the first driven wheel 21, the first eccentric sleeve 23 and the rib 24; and the fixing unit 4 is improved by eliminating the locking sleeve 41 and the locking bolt 42. Under the premise of adjusting the tension of the transmission belt 3, the output position of the driven shaft 22 can also be kept fixed.

[0046] Preferably, Figure 4 As shown, the driven assembly of this embodiment includes a driven shaft 22, a driven gear 25 disposed on the driven shaft 22, a second eccentric sleeve 26, and a second driven wheel 27. The fixed unit 4 includes a fixed cylinder 43, which is fixedly connected to the body 100. The driven shaft 22 is rotatably connected to the inner wall of the fixed cylinder 43. The second eccentric sleeve 26 is sleeved on the fixed cylinder 43 and can rotate on the outer wall of the fixed cylinder 43. The second driven wheel 27 is sleeved on the outer wall of the second eccentric sleeve 26 and can rotate on the outer wall of the second eccentric sleeve 26. The second eccentric sleeve 26 is not coaxial with the fixed cylinder 43.

[0047] Preferably, a connecting hole is provided on the second eccentric sleeve 26 , and the connecting hole is used to connect with the fixing cylinder 43 , and the fixing cylinder 43 can pass through the connecting hole.

[0048] Preferably, the second driven wheel 27 is connected to the transmission belt 3, and the end of the second driven wheel 27 is provided with a transmission tooth (not shown in the figure), which can mesh with the driven gear 25. The rotation of the driving wheel 1 can be transmitted to the second driven wheel 27 through the transmission belt 3, and then transmitted to the driven gear 25 through the transmission tooth, thereby driving the driven shaft 22 to rotate, thereby achieving the purpose of transmission from the driving wheel 1 to the driven shaft 22. The central axis of the driving wheel 1 and the central axis of the driven shaft 22 of this embodiment are parallel to the central axis of the second eccentric sleeve 26, but are not coaxial. Circumferential rotation of the second eccentric sleeve 26 can cause the second driven wheel 27 to rotate around the central axis of the driven shaft 22 and the fixed cylinder 43, thereby changing the wheelbase between the second driven wheel 27 and the driving wheel 1, thereby achieving the purpose of adjusting the tension of the transmission belt 3 without changing the position of the driven shaft 22.

[0049] Preferably, the distance adjustment assembly of this embodiment also includes a second bearing (not shown in the figure), which is arranged between the second driven wheel 27 and the second eccentric sleeve 26. The second bearing is used to reduce the friction between the second driven wheel 27 and the second eccentric sleeve 26, and prevent the second driven wheel 27 from separating from the second eccentric sleeve 26.

[0050] Preferably, Figure 5 As shown, in order to rotate the second eccentric sleeve 26 , the pitch adjustment assembly of this embodiment further includes a gear portion 28 . The gear portions 28 are multiple and evenly distributed along the circumferential direction of the opening of the connecting hole of the second eccentric sleeve 26 .

[0051] Preferably, Figure 3 As shown, the transmission structure of this embodiment further includes a locking unit 5 , which can be connected to the gear portion 28 and enable the second eccentric sleeve 26 to rotate circumferentially around the fixing cylinder 43 .

[0052] Preferably, Figure 3 and Figure 4 As shown, the locking unit 5 includes a locking gear 51, a connecting rod 52, and a transmission rod 53. The connecting rod 52 and the transmission rod 53 are respectively disposed at both ends of the locking gear 51. The fixing unit 4 also includes a pin hole 44 disposed on the outer wall of the fixing cylinder 43. The connecting rod 52 can be inserted into the pin hole 44 and rotated therein. The locking gear 51 can be connected to the gear portion 28. Rotating the transmission rod 53 can drive the locking gear 51 and the gear portion 28, thereby causing the second eccentric sleeve 26 to rotate circumferentially around the fixing cylinder 43.

[0053] Preferably, in order to fix the fixing cylinder 43 at the position of the second eccentric sleeve 26, the fixing unit 4 further includes a fixing pin 45 and a fixing pin spring 46, both of which are disposed in the pin hole 44. One end of the fixing pin spring 46 is connected to the fixing pin 45, and the other end of the fixing pin spring 46 is connected to the pin hole 44. The fixing pin spring 46 is used to push the fixing pin 45 out of the pin hole 44 and prevent the fixing pin 45 from completely disengaging from the pin hole 44.

[0054] Preferably, Figure 4 and Figure 5 As shown, in order to fix the position of the second eccentric sleeve 26, the pitch adjustment assembly of this embodiment also includes a fixing groove 29, which is multiple and evenly distributed circumferentially on the gear part 28. The outer wall of the fixing pin 45 is provided with an axial ridge. When the transmission rod 53 is pressed down, the connecting rod 52 can press the fixing pin 45 into the pin hole 44, and the connecting rod 52 can be connected to the pin hole 44, the locking gear 51 can be connected to the gear part 28, and the second eccentric sleeve 26 can rotate circumferentially around the fixed cylinder 43; when the transmission rod 53 is pulled out, the fixing pin spring 46 can push the fixing pin 45 out of the pin hole 44, the ridge can be connected to the fixing groove 29, and the end of the fixing pin 45 is still in the pin hole 44, thereby preventing the second eccentric sleeve 26 from rotating circumferentially.

[0055] Compared with Example 1, the rotation of the driving wheel 1 of this embodiment can be transmitted to the second driven wheel 27 through the transmission belt 3, and transmitted to the driven gear 25 through the transmission teeth, thereby driving the driven shaft 22 to rotate, thereby achieving the purpose of transmission from the driving wheel 1 to the driven shaft 22; the central axis of the driving wheel 1 and the central axis of the driven shaft 22 of this embodiment are parallel to the central axis of the second eccentric sleeve 26, but are not coaxial; circumferential rotation of the second eccentric sleeve 26 can cause the second driven wheel 27 to rotate around the central axis of the driven shaft 22 and the fixed cylinder 43, thereby changing the wheelbase of the second driven wheel 27 and the driving wheel 1, thereby achieving the purpose of adjusting the tension of the transmission belt 3 without changing the position of the driven shaft 22.

[0056] The connecting rod 52 of this embodiment can be inserted into the pin hole 44 and rotate in the pin hole 44; the locking gear 51 can be connected to the gear part 28, and the rotating transmission rod 53 can drive the locking gear 51 and the gear part 28, and make the second eccentric sleeve 26 rotate circumferentially around the fixed cylinder 43; when the transmission rod 53 is pressed down, the connecting rod 52 can press the fixing pin 45 into the pin hole 44, and the connecting rod 52 can be connected to the pin hole 44, and the locking gear 51 can be connected to the gear part 28, and the second eccentric sleeve 26 can rotate circumferentially around the fixed cylinder 43. The eccentric sleeve 26 rotates circumferentially around the fixed cylinder 43; when the transmission rod 53 is pulled out, the fixed pin spring 46 can push the fixed pin 45 out of the pin hole 44, and the ridge can be connected with the fixed groove 29. The end of the fixed pin 45 is still in the pin hole 44, thereby preventing the second eccentric sleeve 26 from rotating circumferentially; the locking unit 5 can not only make the second eccentric sleeve 26 rotate circumferentially around the fixed cylinder 43, thereby adjusting the tension of the transmission belt 3, but also cooperate with the fixed pin 45 to unlock or lock the second eccentric sleeve 26.

[0057] Example 3:

[0058] To prevent the transmission belt 3 from slipping, another specific embodiment of the present invention discloses a chain transmission structure for a drone. Based on embodiment 1 or 2, a transmission chain is used instead of the transmission belt 3. A driving tooth that matches the transmission chain is added to the outer wall of the driving wheel 1 to form a driving gear; a driven tooth that matches the transmission chain is added to the outer wall of the first driven wheel 21 to form a first driven gear; or a driven tooth that matches the transmission chain is added to the outer wall of the second driven wheel 27 to form a second driven gear, thereby preventing slippage between the transmission structures of this embodiment.

[0059] The chain transmission structure of this embodiment includes a driving gear, a transmission chain, a driven unit 2 and a fixed unit 4. The driven unit 2 includes a first driven gear or a second driven gear.

[0060] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A belt transmission structure for a drone, characterized in that: The invention comprises a driving wheel (1), a driven unit (2), a transmission belt (3) and a fixing unit (4); the driving wheel (1) is connected to the output shaft of the engine of the unmanned aerial vehicle (UAV); the transmission belt (3) is used to connect the driving wheel (1) and the driven unit (2) so as to transmit the rotation of the driving wheel (1) to the driven unit (2); the fixing unit (4) is used to connect the driven unit (2) to the body (100) of the UAV; the driven unit (2) can rotate outward to perform work and is also used to adjust the tension of the transmission belt (3).

2. The belt transmission structure for a drone according to claim 1, characterized in that: The driven unit (2) is composed of a driven component and a distance adjustment component. The distance adjustment component is sleeved on the driven component. The transmission belt (3) can be arranged on the driving wheel (1) and the driven component to transmit the rotation of the driving wheel (1) to the driven component. The distance adjustment component is used to adjust the distance between the driving wheel (1) and the driven component, thereby adjusting the tension of the transmission belt (3).

3. The belt transmission structure for a drone according to claim 2, characterized in that: The driven assembly comprises a first driven wheel (21) and a driven shaft (22), wherein the first driven wheel (21) is arranged at one end of the driven shaft (22), and the first driven wheel (21) is coaxial with the driven shaft (22); the transmission belt (3) can be connected to the first driven wheel (21) and transmit the rotation of the driving wheel (1) to the first driven wheel (21).

4. The belt transmission structure for a drone according to claim 3, characterized in that: The distance adjustment assembly comprises a first eccentric sleeve (23), the first eccentric sleeve (23) is sleeved on the driven shaft (22), and the first eccentric sleeve (23) can be rotatably connected to the fixing unit (4).

5. The belt transmission structure for a drone according to claim 4, characterized in that: The central axis of the driving wheel (1), the central axis of the driven shaft (22) and the central axis of the first eccentric sleeve (23) are parallel, but are not coaxial; circumferential rotation of the first eccentric sleeve (23) can cause the driven shaft (22) to rotate around the central axis of the first eccentric sleeve (23), thereby changing the wheelbase between the first driven wheel (21) and the driving wheel (1).

6. The belt transmission structure for a drone according to claim 4, characterized in that: The distance adjustment assembly further comprises a first bearing, which is arranged between the first eccentric sleeve (23) and the driven shaft (22).

7. The belt transmission structure for a UAV according to claim 4, characterized in that: The fixing unit (4) comprises a locking sleeve (41), and the locking sleeve (41) comprises a first fixing portion, a second fixing portion, and a diameter-changing portion.

8. The belt transmission structure for a UAV according to claim 7, characterized in that: The diameter reducing portion is a cylindrical diameter reducing portion with a side opening, and the diameter reducing portion is used to clamp the first eccentric sleeve (23).

9. The belt transmission structure for a UAV according to claim 8, characterized in that: The first fixing portion and the second fixing portion are respectively arranged on the side walls of the diameter-reducing portion on both sides of the side opening; the first fixing portion is used to be connected to the machine body (100).

10. A chain transmission structure for a drone, characterized in that: It comprises a driving gear, a transmission chain, a driven unit (2) and a fixed unit (4).

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