Single-motor mechanism suitable for coaxial contra-rotating double propellers

Abstract

The invention discloses a single-motor mechanism suitable for coaxial contra-rotating double propellers, and relates to the technical field of unmanned aerial vehicles, the single-motor mechanism comprises a base, a hollow main shaft is fixedly connected to the middle of the upper end face of the base, a rotor shell is rotatably connected to the hollow main shaft, and a stator coil assembly is arranged at the lower end of the hollow main shaft; a permanent magnet matched with the stator coil assembly is arranged on the inner wall of the rotor shell, a connecting rotating shaft is rotationally connected into the hollow main shaft, and a linkage rotor block is fixedly connected to the connecting rotating shaft. The single motor is adopted to drive the double propellers, the rotation directions of the double propellers are opposite, higher and more stable tension brought by reaction torque can be counteracted, the loading capacity of the unmanned aerial vehicle is greatly improved, meanwhile, due to the fact that double-propeller driving is achieved through the single motor, double motors do not need to be used for driving, arrangement of a control circuit is simpler, and cost is lower. Meanwhile, the problems that a dual-motor structure is large in weight and high in energy consumption are solved, and the cruising ability of the unmanned aerial vehicle is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of unmanned aerial vehicles, and in particular to a single motor mechanism suitable for coaxial counter-rotating twin propellers. Background Art

[0002] At present, there are many types of drones, including single-rotor, multi-rotor, fixed-wing, etc. The power of mainstream drones comes from the rotor, that is, the blades. Currently, the mainstream market has more single-blade drones and fewer double-blade drones. The double-blade design has many advantages: improved stability, reduced noise, increased pulling force, etc.

[0003] At present, the mainstream double-blade propellers in the market are driven by dual motors, which not only have a complex structure, but also require power supply and control of dual motors. The control structure is very cumbersome. Since two motors need to be configured, their weight is relatively large. At the same time, dual motors are used to drive and power the two motors, and their energy consumption is generally high, which in turn reduces the flight time of the UAV. To address the above problems, we provide a single-motor mechanism suitable for coaxial counter-rotating dual propellers. Summary of the invention

[0004] The object of the present invention is to provide a single motor mechanism suitable for coaxial counter-rotating twin propellers to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A single motor mechanism suitable for coaxial counter-rotating double propellers, comprising a base, a hollow main shaft fixedly connected to the middle of the upper end surface of the base, a rotor shell rotatably connected to the hollow main shaft, a stator coil assembly provided at the lower end of the hollow main shaft, a permanent magnet matched with the stator coil assembly provided on the inner wall of the rotor shell, a connecting shaft rotatably connected in the hollow main shaft, a linkage rotor block fixedly connected to the connecting shaft, a transmission assembly for causing the linkage rotor block and the rotor shell to rotate in opposite directions is provided between the linkage rotor block and the rotor shell;

[0007] The linkage rotor block is also connected to a protection component for protecting the transmission component;

[0008] The upper end of the connecting shaft is connected to a first rotor assembly, and the surface of the rotor shell is provided with a second rotor assembly.

[0009] As a further solution of the present invention: the transmission assembly includes a second bevel gear, the second bevel gear is fixedly connected to the upper end surface of the rotor housing, the lower end surface of the linked rotor block is fixedly connected to the first bevel gear, both sides of the upper end of the hollow main shaft are fixedly connected to connecting shafts, the ends of the connecting shafts are rotatably connected to the linked bevel gears, and the two sides of the linked bevel gear are respectively meshed with the first bevel gear and the second bevel gear.

[0010] As a further solution of the present invention: the protective component includes a connecting plate and a protective cover, the connecting plate is fixedly connected to the lower end of the linked rotor block, the protective cover is arranged between the connecting plate and the rotor housing, positioning columns are fixedly connected on both sides of the upper end surface of the connecting plate, and the protective cover is provided with positioning holes matching the positioning columns. The connecting plate is also provided with a snap assembly for fixing the protective cover.

[0011] As a further solution of the present invention: the buckle assembly includes an elastic hook buckle, the root of the elastic hook buckle is fixedly connected to the positions on both sides of the upper end surface of the connecting plate, and the protective cover is provided with buckle holes matching the elastic hook buckle.

[0012] As a further solution of the present invention: the first rotor assembly includes a threaded head and a connecting ring, the threaded head is fixedly connected to the upper end of the connecting shaft, a plurality of positioning pins are provided at the upper end edge of the connecting shaft, the connecting ring is sleeved on the threaded head, a plurality of circular holes matching the positioning pins are opened on the connecting ring, a plurality of first blades are fixedly connected to both sides of the connecting ring, and a nut for fixing the connecting ring is provided at the upper end of the threaded head.

[0013] As a further solution of the present invention: the second rotor assembly includes a plug-in sleeve and bolts, the plug-in sleeves are fixedly connected to the positions on both sides of the rotor shell, the plug-in sleeve is provided with a second connecting hole, a plug connector is inserted in the plug-in sleeve, a first connecting hole matching the second connecting hole is provided on the plug connector, a second blade is fixedly connected to the plug connector, and the plug connector and the plug-in sleeve are locked by bolts.

[0014] As a further solution of the present invention: a plurality of air holes are provided on the linkage rotor block, and a plurality of heat dissipation openings are provided on the inclined surface of the side edge of the base.

[0015] As a further solution of the present invention: a gap of 0.5-1 mm is left between the protective cover and the rotor housing, and a gap of 0.5-1 mm is left between the rotor housing and the base.

[0016] As a further solution of the present invention: a plurality of mounting screw holes are provided on the lower end surface of the base.

[0017] As a further solution of the present invention: a power line is also passed through the heat dissipation port, the power line is electrically connected to the stator coil assembly, and a connector is provided at one end of the power line away from the heat dissipation port.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention adopts a single motor to drive double propellers, and the rotation directions of the double propellers are opposite, which can offset the counter-torque to bring higher and more stable pulling force, greatly improving the load capacity of the UAV. At the same time, since the double propellers are driven by a single motor, there is no need to use dual motors for driving, which makes the layout of the control circuit more concise, and avoids the problems of heavy weight and high energy consumption of the dual-motor structure, effectively improving the endurance of the UAV. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the bottom structure of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the transmission component in the present invention.

[0023] Figure 4 It is a schematic diagram of the structure of the protective cover in the present invention.

[0024] Figure 5 It is a schematic diagram of the disassembled structure of the second rotor assembly in the present invention.

[0025] Figure 6 It is a schematic diagram of the disassembled structure of the first rotor assembly in the present invention.

[0026] Figure 7 It is a schematic diagram of the internal structure of the rotor housing in the present invention.

[0027] Among them: 1. base; 2. rotor shell; 3. power cord; 4. second blade; 5. bolt; 6. protective cover; 7. linkage rotor block; 8. first blade; 9. nut; 10. elastic hook buckle; 11. heat dissipation port; 12. mounting screw hole; 13. linkage bevel gear; 14. first bevel gear; 15. air hole; 16. positioning column; 17. connecting plate; 18. connecting shaft; 19. hollow main shaft; 20. second bevel gear; 21. buckle hole; 22. positioning hole; 23. plug sleeve; 24. plug connector; 25. first connecting hole; 26. second connecting hole; 27. connecting shaft; 28. connecting ring; 29. ​​threaded head; 30. round hole; 31. positioning pin; 32. stator coil assembly; 33. permanent magnet. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 7 In an embodiment of the present invention, a single motor mechanism suitable for coaxial counter-rotating double propellers includes a base 1, a hollow main shaft 19 is fixedly connected to the middle of the upper end surface of the base 1, a rotor housing 2 is rotatably connected to the hollow main shaft 19, a stator coil assembly 32 is provided at the lower end of the hollow main shaft 19, a permanent magnet 33 matching the stator coil assembly 32 is provided on the inner wall of the rotor housing 2, a connecting shaft 27 is rotatably connected inside the hollow main shaft 19, a linkage rotor block 7 is fixedly connected to the connecting shaft 27, a plurality of air holes 15 are opened on the linkage rotor block 7, a plurality of heat dissipation ports 11 are opened on the inclined surface of the side of the base 1, a power line 3 is also passed through the heat dissipation port 11, The power cord 3 is electrically connected to the stator coil assembly 32, and a connector is provided at one end of the power cord 3 away from the heat dissipation port 11. A transmission assembly is provided between the linkage rotor block 7 and the rotor housing 2 for causing the linkage rotor block 7 and the rotor housing 2 to rotate in opposite directions. A plurality of mounting screw holes 12 are provided on the lower end surface of the base 1. During operation, the stator coil assembly 32 and the permanent magnet 33 cooperate with each other to drive the rotor housing 2 to rotate. While the rotor housing 2 rotates, the linkage rotor block 7 can be driven to rotate through the transmission assembly, so that the rotor housing 2 and the linkage rotor block 7 move synchronously and in opposite directions. At the same time, the mounting screw holes 12 provided can facilitate the installation and fixation of the base 1.

[0030] The transmission assembly includes a second bevel gear 20, which is fixedly connected to the upper end surface of the rotor housing 2, and the lower end surface of the linked rotor block 7 is fixedly connected to the first bevel gear 14. The upper ends of the hollow main shaft 19 are fixedly connected to the connecting shafts 18 on both sides, and the ends of the connecting shafts 18 are rotatably connected to the linked bevel gears 13, and the two sides of the linked bevel gear 13 are respectively meshed with the first bevel gear 14 and the second bevel gear 20; during operation, the rotation of the rotor housing 2 can drive the second bevel gear 20 to rotate, and the rotation of the second bevel gear 20 can drive the linked bevel gear 13 to rotate, and the rotation of the linked bevel gear 13 can drive the first bevel gear 14 to rotate. Since the first bevel gear 14 and the second bevel gear 20 are meshed with the two sides of the linked bevel gear 13, the first bevel gear 14 and the second bevel gear 20 rotate in opposite directions, and the first bevel gear 14 and the second bevel gear 20 rotate in opposite directions, thereby realizing the linked rotor block 7 and the rotor housing 2 to rotate in opposite directions.

[0031] The linkage rotor block 7 is also connected to a protective component for protecting the transmission component; the protective component includes a connecting plate 17 and a protective cover 6, the connecting plate 17 is fixedly connected to the lower end of the linkage rotor block 7, the protective cover 6 is arranged between the connecting plate 17 and the rotor housing 2, and the upper end surface of the connecting plate 17 is fixedly connected to positioning columns 16 on both sides, and the protective cover 6 is provided with positioning holes 22 matching the positioning columns 16, and the connecting plate 17 is also provided with a buckle component for fixing the protective cover 6, and the buckle component includes an elastic hook buckle 10 The root of the elastic hook-shaped buckle 10 is fixedly connected to the positions on both sides of the upper end surface of the connecting plate 17, and the protective cover 6 is provided with buckle holes 21 matching the elastic hook-shaped buckle 10; the protective cover 6 can protect the transmission component to prevent debris from being involved in the gear, and the elastic hook-shaped buckle 10 can be disassembled to facilitate the repair or maintenance of the transmission component. When the protective cover 6 needs to be disassembled, the first blade 8 can be disassembled first, and then the elastic hook-shaped buckle 10 is buckled to separate it from the buckle hole 21, and then the protective cover 6 can be removed, and the disassembly is convenient.

[0032] A first rotor assembly is connected to the upper end of the connecting shaft 27, and the first rotor assembly includes a threaded head 29 and a connecting ring 28. The threaded head 29 is fixedly connected to the upper end of the connecting shaft 27. A plurality of positioning pins 31 are provided at the upper edge of the connecting shaft 27. The connecting ring 28 is sleeved on the threaded head 29. The connecting ring 28 is provided with a plurality of circular holes 30 matching the positioning pins 31. A plurality of first paddles 8 are fixedly connected to both sides of the connecting ring 28. A nut 9 for fixing the connecting ring 28 is provided at the upper end of the threaded head 29. When installing the first paddle 8, the connecting ring 28 is sleeved on the threaded head 29, and the positioning pin 31 is inserted into the circular hole 30 to position the connecting ring 28. Then the nut 9 is threadedly connected to the threaded head 29 to tighten the connecting ring 28 to complete the installation of the first paddle 8.

[0033] A second rotor assembly is provided on the surface of the rotor housing 2; the second rotor assembly includes a plug sleeve 23 and a bolt 5, the plug sleeve 23 is fixedly connected to the positions on both sides of the rotor housing 2, a second connecting hole 26 is provided on the plug sleeve 23, a plug connector 24 is inserted in the plug sleeve 23, a first connecting hole 25 matching the second connecting hole 26 is provided on the plug connector 24, a second impeller 4 is fixedly connected to the plug connector 24, and the plug connector 24 and the plug sleeve 23 are locked by the bolt 5; when installing the second impeller 4, the first connecting hole 25 is inserted into the plug sleeve 23, and then the first connecting hole 25 is aligned with the second connecting hole 26, and after alignment, the bolt 5 is inserted into the first connecting hole 25 and the second connecting hole 26 and then locked.

[0034] A gap of 0.5-1 mm is left between the protective cover 6 and the rotor housing 2, and a gap of 0.5-1 mm is left between the rotor housing 2 and the base 1. The lower end surface of the base 1 is provided with a plurality of mounting screw holes 12; the provided gaps can avoid interference between parts.

[0035] The working principle of the present invention is as follows: before use, the first blade 8 and the second blade 4 are installed first. During operation, the stator coil assembly 32 and the permanent magnet 33 cooperate with each other to drive the rotor housing 2 to rotate. The rotation of the rotor housing 2 can drive the second bevel gear 20 to rotate. The rotation of the second bevel gear 20 can drive the linkage bevel gear 13 to rotate. The rotation of the linkage bevel gear 13 can drive the first bevel gear 14 to rotate. Since the first bevel gear 14 and the second bevel gear 20 are meshed with both sides of the linkage bevel gear 13, the first bevel gear 14 and the second bevel gear 20 rotate in opposite directions. The first bevel gear 14 and the second bevel gear 20 rotate in opposite directions to realize the linkage rotor block 7 and the rotor housing 2 to rotate in opposite directions. The rotation of the rotor housing 2 and the linkage rotor block 7 can drive the second blade 4 and the first blade 8 to rotate accordingly. The rotation directions of the two propellers are opposite, which can offset the counter-torque to bring higher and more stable pulling force, thereby greatly improving the load capacity of the drone.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Although this specification is described in accordance with the implementation modes, not every implementation mode includes only one technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A single motor mechanism suitable for coaxial counter-rotating twin propellers, comprising a base (1), characterized in that: A hollow main shaft (19) is fixedly connected in the middle of the upper end surface of the base (1), a rotor housing (2) is rotatably connected to the hollow main shaft (19), a stator coil assembly (32) is provided at the lower end of the hollow main shaft (19), an inner wall of the rotor housing (2) is provided with a permanent magnet (33) matching the stator coil assembly (32), a connecting shaft (27) is rotatably connected inside the hollow main shaft (19), a linkage rotor block (7) is fixedly connected to the connecting shaft (27), and a transmission assembly for causing the linkage rotor block (7) and the rotor housing (2) to rotate in opposite directions is provided between the linkage rotor block (7) and the rotor housing (2); The linkage rotor block (7) is also connected to a protection component for protecting the transmission component; The upper end of the connecting shaft (27) is connected to a first rotor assembly, and the surface of the rotor housing (2) is provided with a second rotor assembly.

2. A single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 1, characterized in that: The transmission assembly comprises a second bevel gear (20), the second bevel gear (20) is fixedly connected to the upper end surface of the rotor housing (2), the lower end surface of the linkage rotor block (7) is fixedly connected to the first bevel gear (14), both sides of the upper end of the hollow main shaft (19) are fixedly connected to connecting shafts (18), the ends of the connecting shafts (18) are rotatably connected to the linkage bevel gear (13), and the two sides of the linkage bevel gear (13) are respectively meshed with the first bevel gear (14) and the second bevel gear (20).

3. A single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 1, characterized in that: The protective component comprises a connecting plate (17) and a protective cover (6); the connecting plate (17) is fixedly connected to the lower end of the linkage rotor block (7); the protective cover (6) is arranged between the connecting plate (17) and the rotor housing (2); positioning columns (16) are fixedly connected to both sides of the upper end surface of the connecting plate (17); the protective cover (6) is provided with positioning holes (22) matching the positioning columns (16); and the connecting plate (17) is also provided with a buckle component for fixing the protective cover (6).

4. A single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 3, characterized in that: The buckle assembly comprises an elastic hook buckle (10), the base of which is fixedly connected to the positions on both sides of the upper end surface of the connection plate (17), and a buckle hole (21) matching the elastic hook buckle (10) is provided on the protective cover (6).

5. A single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 1, characterized in that: The first rotor assembly comprises a threaded head (29) and a connecting ring (28), wherein the threaded head (29) is fixedly connected to the upper end of the connecting shaft (27), a plurality of positioning pins (31) are arranged at the upper edge of the connecting shaft (27), the connecting ring (28) is sleeved on the threaded head (29), a plurality of circular holes (30) matching the positioning pins (31) are opened on the connecting ring (28), a plurality of first blades (8) are fixedly connected to both sides of the connecting ring (28), and a nut (9) for fixing the connecting ring (28) is arranged at the upper end of the threaded head (29).

6. A single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 1, characterized in that: The second rotor assembly comprises a plug sleeve (23) and a bolt (5); the plug sleeve (23) is fixedly connected to positions on both sides of the rotor housing (2); a second connecting hole (26) is provided on the plug sleeve (23); a plug connector (24) is inserted in the plug sleeve (23); a first connecting hole (25) matching the second connecting hole (26) is provided on the plug connector (24); a second blade (4) is fixedly connected to the plug connector (24); and the plug connector (24) and the plug sleeve (23) are locked by means of the bolt (5).

7. A single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 1, characterized in that: The linkage rotor block (7) is provided with a plurality of air holes (15), and the inclined surface on the side of the base (1) is provided with a plurality of heat dissipation openings (11).

8. The single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 3, characterized in that: A gap of 0.5-1 mm is left between the protective cover (6) and the rotor housing (2), and a gap of 0.5-1 mm is left between the rotor housing (2) and the base (1).

9. A single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 1, characterized in that: The lower end surface of the base (1) is provided with a plurality of mounting screw holes (12).

10. A single motor mechanism suitable for coaxial counter-rotating twin propellers according to claim 7, characterized in that: A power line (3) is also passed through the heat dissipation opening (11), the power line (3) is electrically connected to the stator coil assembly (32), and a connector is provided at one end of the power line (3) away from the heat dissipation opening (11).

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