A power and transmission system of an electric coaxial dual-rotor unmanned helicopter

Abstract

The application discloses a power and transmission system of an electric coaxial dual-rotor unmanned helicopter, and belongs to the technical field of helicopter power and transmission, which comprises a non-rotating main shaft connected to a body structure, a tooth disc sleeve is sleeved on the upper and lower ends of the non-rotating main shaft, one rotor rotating hub is connected to the end of each tooth disc sleeve away from the center of the non-rotating main shaft, a transmission mechanism is connected to each tooth disc sleeve, the transmission mechanism is connected to a driving mechanism, the driving mechanism drives the transmission mechanism to rotate, and then drives the tooth disc sleeve to rotate, and then drives the rotor rotating hub to rotate, so that the electric coaxial dual-rotor unmanned helicopter is driven; the driving mechanism connected to the upper tooth disc sleeve is arranged downward, the driving mechanism connected to the lower tooth disc sleeve is arranged upward, and the two driving mechanisms are arranged in a central symmetry around the center of the non-rotating main shaft; the application can reduce the weight of the helicopter, reduce electromagnetic interference, and rationally utilize space for system layout.

Description

Technical Field

[0001] This invention relates to a power and transmission system for an electric coaxial twin-rotor unmanned helicopter, belonging to the field of helicopter power and transmission technology. Background Technology

[0002] With the continuous development of energy and power technologies, more and more drones are using lithium batteries and electric motors for propulsion. For electric coaxial unmanned helicopters, takeoff weight is a crucial parameter, determining its flight time, payload, and other performance indicators. Therefore, reducing structural weight is a key design task for electric coaxial unmanned helicopters.

[0003] The weight of a coaxial unmanned helicopter mainly consists of the following components: transmission system, fuselage, rotor system, control system, and power system, with the power and transmission systems accounting for a large proportion of the total weight. Therefore, improving the power and transmission systems and reducing their structural weight and complexity are key technologies for improving the flight performance of electric coaxial unmanned helicopters.

[0004] Existing electric coaxial unmanned helicopters mostly use disc motors to directly drive the rotors in their power and transmission systems. During rotation, the motors lack sufficient rigidity under rotor loads. Adding a pitch-changing mechanism to the two rotors significantly increases the fuselage size of the coaxial unmanned helicopter, hindering the realization of the miniaturization advantages of UAVs. This direct-drive structure results in very close proximity between the motors and avionics, leading to electromagnetic interference issues. As the takeoff weight of UAVs increases, the weaknesses of direct-drive disc motors become increasingly apparent, and the structural weight of the power system increases significantly. Summary of the Invention

[0005] The purpose of this invention is to provide a power and transmission system for an electric coaxial dual-rotor unmanned helicopter, which solves the problems of electromagnetic interference, excessive fuselage size, and increased weight in the prior art.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] This invention provides a power and transmission system for an electric coaxial dual-rotor unmanned helicopter, including a non-rotating main shaft connected to the fuselage structure. A geared sleeve is fitted at each of the upper and lower ends of the non-rotating main shaft. A rotor hub is connected to the end of each geared sleeve furthest from the center of the non-rotating main shaft. Transmission mechanisms are connected to the two geared sleeves, and these transmission mechanisms are connected to a drive mechanism. The drive mechanism drives the transmission mechanism to rotate, which in turn drives the geared sleeves to rotate, and consequently drives the rotor hubs to rotate, thus driving the electric coaxial dual-rotor unmanned helicopter. The drive mechanism connected to the upper geared sleeve faces downwards, and the drive mechanism connected to the lower geared sleeve faces upwards. The two drive mechanisms are centrally symmetrical about the center of the non-rotating main shaft.

[0008] Furthermore, the transmission mechanism includes an upper gear plate mating part, a large gear plate, and a lower gear plate mating part connected in sequence by bolts, and also includes small helical teeth that mesh with the large gear plate.

[0009] Furthermore, the gear sleeve is provided with a first threaded hole, and the gear sleeve and the mating parts on the gear disk are fixedly connected by the first screw and the first threaded hole, thereby realizing the connection between the gear sleeve and the transmission mechanism.

[0010] Furthermore, on the geared disc sleeve, the diameter on the side closer to the non-rotating main shaft is smaller than the diameter on the side farther from the non-rotating main shaft, and the geared disc sleeve is fixedly connected to the rotor hub by positioning bolts.

[0011] Furthermore, the drive mechanism is a high-efficiency column motor, and the motor shaft of the high-efficiency column motor is fitted with the small helical gear and fixedly connected to the small helical gear, thereby realizing the connection between the transmission mechanism and the drive mechanism.

[0012] Furthermore, the high-efficiency column motor is fixedly connected to the machine body structure through a fixing mechanism. The fixing mechanism includes an upper motor fixing seat and a lower motor fixing seat. Both the upper motor fixing seat and the lower motor fixing seat are provided with a second threaded hole. The upper motor fixing seat and the lower motor fixing seat are fixed to the machine body structure through the second screw and the second threaded hole. The machine body structure includes a first body and a second body connected to the left and right sides of the non-rotating spindle. The upper motor fixing seat and the lower motor fixing seat are located between the first body and the second body.

[0013] The high-efficiency column motor is provided with a third threaded hole, and the high-efficiency column motor and the upper motor mounting base are fixedly connected by the third screw, the third threaded hole and the second threaded hole. The lower motor mounting base is provided with a bearing to accommodate the rotation of the motor shaft of the high-efficiency column motor within the bearing.

[0014] Furthermore, the system is a centrally symmetric structure.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0016] The present invention provides a power and transmission system for an electric coaxial dual-rotor unmanned helicopter. The two drive mechanisms are connected by a transmission mechanism and a gear sleeve and arranged on a non-rotating main shaft, and are oriented in opposite directions. This fully utilizes the unused lateral dimension of the electric coaxial dual-rotor unmanned helicopter, reduces the size of the longitudinal dimension, and the two drive mechanisms are arranged in a concentrated manner to ensure that the distance between the motor and the avionics equipment is as far as possible, effectively reducing electromagnetic interference.

[0017] This invention employs a high-efficiency column motor. Compared with the traditional large-diameter disc motor, it uses a small-diameter high-efficiency column motor combined with a geared disc sleeve for a reduction transmission structure. This results in a lighter structure, higher rigidity, and greater power, providing more ideal flight performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the power and transmission system of an electric coaxial dual-rotor unmanned helicopter provided in an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 The left view.

[0020] In the diagram: 1. Non-rotating spindle; 2. Upper motor mounting base; 3. Lower motor mounting base; 4. High-efficiency column motor; 5. Large gear disc; 6. Upper gear disc mating part; 7. Lower gear disc mating part; 8. Gear disc sleeve; 9. Positioning bolt; 10. Rotor hub; 11. First fuselage; 12. Second fuselage; 13. Small helical gear. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0022] like Figure 1 As shown, this embodiment of the invention provides a power and transmission system for an electric coaxial dual-rotor unmanned helicopter, including a non-rotating main shaft 1 directly connected to the fuselage structure. An upper motor mounting base 2 and a lower motor mounting base 3 are mounted on the fuselage structure. High-efficiency column motors 4 are fixedly mounted on the upper motor mounting base 2 and the lower motor mounting base 3. Small helical gears 13 are mounted on the high-efficiency column motors 4, and the small helical gears 13 mesh with a large gear disk 5. There are two sets of high-efficiency column motors 4 and large gear disks 5. The high-efficiency column motors 4 are arranged on the left and right sides of the non-rotating main shaft 1, facing opposite directions, while the large gear disks 5 are arranged on the upper and lower sides of the non-rotating main shaft 1.

[0023] The gear sleeve 8 contains a bearing and is fitted onto the non-rotating main shaft 1. The side of the gear sleeve 8 with a smaller diameter rests against the upper side of the boss on the non-rotating main shaft 1, while the side with a larger diameter is fixedly connected to the rotor hub 10 via four positioning bolts 9. The upper gear 6, the large gear 5, and the lower gear 7 are sequentially connected and fixed by bolts. The gear sleeve 8 has a first threaded hole on its side cylinder, which is connected and fixed to the upper gear 6 via a first screw. In this way, the gear sleeve 8, the rotor hub 10, the upper gear 6, the large gear 5, and the lower gear 7 can rotate together around the non-rotating main shaft 1.

[0024] like Figure 2 As shown, the first body 11 and the second body 12 are each mounted on the non-rotating spindle 1 by four screws; the upper motor mounting base 2 and the lower motor mounting base 3 have second threaded holes and are fixed between the first body 11 and the second body 12 by second screws; the high-efficiency column motor 4 has a third threaded hole and is fixed to the upper motor mounting base 2 by a third screw; the lower motor mounting base 3 has a bearing inside, the upper motor shaft of the high-efficiency column motor 4 is rotatable in the bearing, and the high-efficiency column motor 4 is equipped with a small helical gear 13, which rotates together with the motor shaft;

[0025] When the small helical gear 13 on the high-efficiency column motor 4 meshes with the large gear disk 5, the rotation of the motor shaft on the high-efficiency column motor 4 can drive the large gear disk 5 to rotate, and finally drive the rotor hub 10 to rotate; the other side device is installed in the same way as the above structure, but in the opposite direction, so it will not be described in detail.

[0026] The following is based on Figure 1 and Figure 2The specific working method of this embodiment is as follows: First, the upper gear plate 6, the large gear plate 5, and the lower gear plate 7 are stacked and connected and fixed in sequence by bolts, and then fitted onto the gear plate sleeve 8. The position is adjusted, and the upper gear plate 6 is fixed onto the gear plate sleeve 8 using the first screw. At the same time, the lower gear plate 6, the large gear plate 5, and the lower gear plate 7 are installed onto the gear plate sleeve 8 in the same way. Next, the gear plate sleeve 8 is fitted onto the non-rotating main shaft 1, with the smaller diameter side of the gear plate sleeve 8 attached to the upper side of the boss of the non-rotating main shaft 1, and the rotor hub 10 is fixedly connected to the larger diameter side of the gear plate sleeve 8 by four positioning bolts 9. The lower gear plate sleeve 8 and the rotor hub 10 are installed on the lower side of the boss of the non-rotating main shaft 1 in the same way, in opposite directions. Then, the small helical gear 13 is installed onto the high-efficiency column motor 4. Next, the high-efficiency column motor 4 is installed onto the upper motor mounting base 2 by screws, and the lower motor mounting base 3 is fitted onto the motor shaft of the high-efficiency column motor 4. Connect the lower small helical gear 13, high-efficiency column motor 4, upper motor mounting base 2, and lower motor mounting base 3 in the same manner; then mesh the small helical gear 13 on the high-efficiency column motor 4 with the large gear disk 5, and fix the upper motor mounting base 2 and lower motor mounting base 3 to the second fuselage 12 with screws. Similarly, fix the lower upper motor mounting base 2 and lower motor mounting base 3 to the second fuselage 12 in the opposite direction; finally, fix the second fuselage 12 along with other structures to the threaded hole position of the non-rotating main shaft 1 with four screws, and cover the opposite side of the non-rotating main shaft 1 with the first fuselage 11, and connect it to the non-rotating main shaft 1, upper motor mounting base 2, and lower motor mounting base 3 with screws respectively; thus, the rotation of the high-efficiency column motor 4 can drive the rotor hub 10 to rotate.

[0027] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power and transmission system for an electric coaxial dual-rotor unmanned helicopter, characterized in that, The system includes a non-rotating main shaft connected to the fuselage structure. A geared sleeve is fitted at each of the upper and lower ends of the non-rotating main shaft. A rotor hub is connected to the end of each geared sleeve furthest from the center of the non-rotating main shaft. A transmission mechanism is connected to each geared sleeve, and the transmission mechanism is connected to a drive mechanism. The drive mechanism drives the transmission mechanism to rotate, which in turn drives the geared sleeves to rotate, and in turn drives the rotor hubs to rotate, thus driving the electric coaxial dual-rotor unmanned helicopter. The drive mechanism connected to the upper geared sleeve faces downwards, and the drive mechanism connected to the lower geared sleeve faces upwards. The two drive mechanisms are centrally symmetrical about the center of the non-rotating main shaft. On the geared disc sleeve, the diameter on the side closer to the non-rotating main shaft is smaller than the diameter on the side farther from the non-rotating main shaft, and the geared disc sleeve is fixedly connected to the rotor hub by positioning bolts. The drive motor is a high-efficiency column motor. The high-efficiency column motor is fixedly connected to the machine body structure through a fixing mechanism. The fixing mechanism includes an upper motor fixing seat and a lower motor fixing seat. Both the upper motor fixing seat and the lower motor fixing seat are provided with a second threaded hole. The upper motor fixing seat and the lower motor fixing seat are fixed to the machine body structure through the second screw and the second threaded hole. The machine body structure includes a first body and a second body connected to the left and right sides of the non-rotating spindle. The upper motor fixing seat and the lower motor fixing seat are located between the first body and the second body. The high-efficiency column motor is provided with a third threaded hole, and the high-efficiency column motor and the upper motor mounting base are fixedly connected by the third screw, the third threaded hole and the second threaded hole. The lower motor mounting base is provided with a bearing to accommodate the rotation of the motor shaft of the high-efficiency column motor within the bearing. The system is a centrally symmetric structure.

2. The power and transmission system of an electric coaxial dual-rotor unmanned helicopter according to claim 1, characterized in that, The transmission mechanism includes an upper gear plate mating part, a large gear plate, and a lower gear plate mating part connected in sequence by bolts, and also includes small helical teeth that mesh with the large gear plate.

3. The power and transmission system of an electric coaxial dual-rotor unmanned helicopter according to claim 2, characterized in that, The gear sleeve is provided with a first threaded hole. The gear sleeve and the mating parts on the gear disk are fixedly connected by the first screw and the first threaded hole, thereby realizing the connection between the gear sleeve and the transmission mechanism.

4. The power and transmission system of an electric coaxial dual-rotor unmanned helicopter according to claim 2, characterized in that, The high-efficiency column motor has small helical teeth fitted on its motor shaft and is fixedly connected to them, thereby connecting the transmission mechanism and the drive mechanism.

Images