Compact type double-planet-wheel electric rotor wing speed reduction device

Abstract

The invention discloses a compact double-planet-wheel electric rotor speed reducer which comprises an outer gear ring shell, a sun wheel, two planet wheels, a driving motor and a clamping device. The outer gear ring shell is of a semi-closed structure with the top open and the bottom provided with a rotor wing bottom plate, and the outer gear ring shell and the rotor wing bottom plate are assembled to form a complete transmission cavity. The interior of the outer gear ring shell is divided into an upper-layer gear cavity and a lower-layer motor cavity through a horizontal partition. The driving motor is mounted in the motor cavity and is fixed below the horizontal partition through a screw; inner teeth are formed on the peripheral side of the inner wall of the gear cavity; the sun gear and the two planet gears are positioned in the gear cavity to form a complete planetary transmission system; the clamping device is formed at the bottom end of the outer gear ring shell and is rapidly connected with an external rod piece through a bolt. By adopting a highly-integrated planetary gear train transmission scheme, miniaturization, modularization and rapid installation of a transmission system are achieved, and the transmission efficiency and use convenience are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of aircraft transmission and structural design technology, and in particular to a compact dual planetary gear electric rotor deceleration device. Background Technology

[0002] With the rapid development of urban air traffic and unmanned flight technology, multi-rotor aircraft have been widely used due to their vertical take-off and landing and hovering capabilities.

[0003] However, the performance of its power transmission system directly affects the aircraft's load, efficiency, and reliability. Currently, most aircraft use direct motor drive or simple reduction gears, which suffer from problems such as loose structure, low transmission efficiency, and complex connection with the airframe.

[0004] Traditional distributed designs result in heavy systems that occupy a lot of space, and are prone to vibration and noise at high speeds, affecting flight stability and range. In addition, existing deceleration devices often lack integrated mounting structures, requiring additional brackets to connect to the fuselage, which increases assembly complexity and overall weight. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a compact dual planetary gear electric rotor reducer. This compact dual planetary gear electric rotor reducer achieves miniaturization, modularization and rapid installation of the transmission system by adopting a highly integrated planetary gear transmission scheme, which significantly improves transmission efficiency and ease of use.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A compact dual-planetary-gear electric rotor reduction gear includes an external gear ring housing, a sun gear, two planetary gears, a drive motor, and a clamping device; The outer gear ring housing is a semi-enclosed structure with an opening at the top and a rotor base plate at the bottom. The outer gear ring housing is assembled with the rotor base plate to form a complete transmission chamber. The outer gear ring housing is divided into an upper gear cavity and a lower motor cavity by a horizontal partition. The drive motor is installed inside the motor cavity and fixed to the bottom of the horizontal partition with screws; Internal teeth are formed on the circumferential side of the inner wall of the gear cavity; The sun gear and two planet gears are located inside the gear cavity, forming a complete planetary transmission system; The clamping device is formed at the bottom of the outer gear ring housing, and it is quickly connected to the external rod by bolts.

[0007] Furthermore, the sun gear is located at the center of the gear cavity, and two planet gears are symmetrically arranged on both sides of the sun gear. The planet gears mesh with the external teeth of the sun gear and the internal teeth of the gear cavity, respectively, thus forming a complete planetary transmission system.

[0008] Furthermore, the horizontal partition has a central through hole and four symmetrically distributed motor mounting holes. The lower end of the sun gear shaft at the center of the sun gear passes through the central through hole and connects to the output shaft of the drive motor. Screws pass through the motor mounting holes to fix the drive motor body to the bottom of the horizontal partition.

[0009] Furthermore, the planetary gear shafts at the center of the two planetary gears extend upwards, pass through the positioning and mounting holes of the rotor, and are then fixed by planetary gear bearings to fix the axial displacement, so as to output the decelerated power to the rotor.

[0010] Furthermore, the upper end of the sun gear shaft is supported and positioned by the sun gear bearing, and the upper ends of the planet gear shafts at the centers of the two planet gears are also supported by planet gear bearings. The sun gear bearing and the planet gear bearings together form an axial positioning system, which stably clamps the rotor blades between the outer gear ring housing and the planet gear bearings, ensuring precise alignment and smooth operation of the transmission system.

[0011] Furthermore, the reduction ratio of the device ranges from 2.5 to 6.

[0012] Furthermore, the reduction ratio of the device is 4.5.

[0013] Furthermore, the clamping device includes an upper flange and a lower flange that are split in half. The top of the upper flange is integrally fixed to the bottom of the outer gear ring housing. The upper flange has an upwardly recessed semi-circular through groove, and the lower flange has a downwardly recessed semi-circular through groove. The upper flange and the lower flange together form a circular clamping through groove, and bolt through holes are opened at the four corners of the flange, and the bolts are used to achieve uniform locking.

[0014] Furthermore, the outer gear ring housing is integrally formed using 3D printing technology, with a wall thickness of 4mm; the horizontal partition thickness is 3mm.

[0015] Furthermore, a wire hole is provided on the side wall of the motor cavity, which is used to connect the drive motor to an external power supply and control system.

[0016] The present invention has the following beneficial effects: 1. Highly Integrated Design: Traditional multi-rotor aircraft transmission systems typically employ direct motor drive or simple reduction gear mechanisms, resulting in drawbacks such as non-compact structure, poor transmission smoothness, and complex connections to the airframe. This invention integrates the reduction gear mechanism with the rotor drive into a single unit, achieving a compact structure. This layout significantly improves the aircraft's structural compactness and flight efficiency. By adopting a highly integrated planetary gear transmission scheme, the transmission system achieves miniaturization, modularization, and rapid installation, significantly improving transmission efficiency and ease of use.

[0017] 2. Integrated design for smooth and reliable transmission: The sun gear 2 is located at the center of the gear cavity 17, and two planet gears 3 are symmetrically arranged on both sides of the sun gear 2. The planet gears 3 mesh with the external teeth of the sun gear and the internal teeth of the gear cavity, respectively, thus forming a complete planetary transmission system. By adopting a symmetrical layout of double planet gears and optimizing the reduction ratio, the smoothness and efficiency of the transmission are ensured.

[0018] 3. Convenient and reliable installation, simple maintenance: This invention achieves a quick and rigid connection with the airframe components through the cooperation of the semi-enclosed bottom shell and clamping device. This design significantly reduces system weight and simplifies the assembly process while ensuring transmission efficiency, providing a compact, rigid, and easy-to-deploy power transmission solution for multi-rotor aircraft. When disassembly and maintenance are required, simply loosen the four sets of bolts at the flange corners to remove the entire reduction gear from the components, greatly simplifying the maintenance process. Attached Figure Description

[0019] Figure 1 This is a complete assembly perspective view of the compact double planetary gear reducer of the present invention; Figure 2 This is a schematic diagram of the internal structure of the speed reduction device of the present invention (horizontal partitions are not shown). Figure 3 This is a three-dimensional view of the deceleration device of the present invention; Figure 4 This is a top view of the deceleration device of the present invention; Figure 5 This is a side view of the deceleration device of the present invention; The numbers in the diagram are as follows: 1. External gear ring housing, 11. Internal gear, 12. Recessed semi-circular through groove, 13. Bolt through hole, 14. Wire hole, 15. Upper flange, 16. Horizontal partition, 161. Central through hole, 162. Motor mounting hole, 17. Gear cavity, 18. Motor cavity, 2. Sun gear, 21. Sun gear shaft, 3. Planetary gear, 31. Planetary gear shaft, 4. Drive motor, 5. Clamping device, 6. Sun gear bearing, 7. Planetary gear bearing, 8. Rotor blade. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0021] In the description of this invention, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this invention. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this invention.

[0022] A compact dual planetary gear electric rotor reducer includes an outer gear ring housing 1, a sun gear 2, two planetary gears 3, a drive motor 4, and a clamping device 5.

[0023] The outer gear ring housing 1 is an integral load-bearing structure. The outer gear ring housing 1 is a semi-enclosed structure with an opening at the top and a rotor base plate at the bottom. The outer gear ring housing 1 forms a complete transmission chamber by assembling with the rotor base plate. The outer gear ring housing is the load-bearing main body and transmission chamber of the entire device.

[0024] The outer gear ring housing 1 is divided into an upper gear cavity 17 and a lower motor cavity 18 by a horizontal partition 16. The drive motor 4 is installed inside the motor cavity 18 and fixed to the bottom of the horizontal partition 16 with screws; Internal teeth 11 are formed on the circumferential side of the inner wall of the gear cavity 17; The sun gear 2 and the two planet gears 3 are located in the gear cavity 17 to form a complete planetary transmission system; The clamping device 5 is formed at the bottom end of the outer gear ring housing 1, and it is quickly connected to the external rod by bolts.

[0025] This invention effectively overcomes the structural defects of traditional transmission schemes by highly integrating the external gear ring housing, planetary transmission system and motor mounting structure.

[0026] Furthermore, the sun gear 2 is located at the center of the gear cavity 17, and two planet gears 3 are symmetrically arranged on both sides of the sun gear 2. The planet gears 3 mesh with the external teeth of the sun gear and the internal teeth of the gear cavity, respectively, thus forming a complete planetary transmission system.

[0027] like Figure 4 As shown, the horizontal partition 16 has a central through hole 161 and four symmetrically distributed motor mounting holes 162. The lower end of the sun gear shaft 21 at the center of the sun gear 2 passes through the central through hole 161 and connects to the output shaft of the drive motor 4. Figure 2 As shown, the output shaft of the drive motor 4 is directly connected to the sun gear 2 in the upper direction to provide power and drive the entire gear train; Furthermore, screws pass through the motor mounting hole 162 to fix the drive motor 4 body below the horizontal partition 16. In this way, the connection between the sun gear shaft and the motor is ensured, and the motor is reliably fixed.

[0028] Furthermore, such as Figure 1 As shown, the planetary gear shafts 31 at the center of the two planetary gears 3 extend upward, pass through the positioning and mounting holes of the rotor, and are then fixed by planetary gear bearings to fix the axial displacement, so as to output the decelerated power to the rotor.

[0029] Furthermore, such as Figure 1 As shown, the upper end of the sun gear shaft 21 is supported and positioned by the sun gear bearing 6, and the upper ends of the planet gear shafts 31 at the center of the two planet gears 31 are supported by the planet gear bearings 7. The sun gear bearing 6 and the planet gear bearings 7 together form an axial positioning system, which stably clamps the rotor blade 8 between the outer gear ring housing 1 and the planet gear bearings 7, ensuring the precise alignment and smooth operation of the transmission system.

[0030] like Figure 2 As shown, when the drive motor starts, the power is transmitted to the sun gear through the sun gear shaft. The sun gear drives the planetary gears on both sides to perform planetary motion in the outer gear ring housing, and finally drives the rotor blades to rotate through the planetary gear shaft, thus achieving smooth and efficient power transmission.

[0031] Furthermore, the reduction ratio of the device ranges from 2.5 to 6.

[0032] Preferably, the reduction ratio of the device is 4.5. Specifically, when the drive motor starts, the power is transmitted to the sun gear through the sun gear shaft in sequence. The sun gear drives the planetary gears on both sides to perform planetary motion in the inner gear ring of the outer gear ring housing. That is, the planetary gears rotate around their own axes while revolving around the sun gear. The revolution of the planetary gears drives the rotor blades to rotate through the planetary gear shaft, thereby realizing a fixed reduction ratio of 4.5:1.

[0033] like Figure 1 , 3 As shown in Figure 5, the clamping device 5 includes an upper flange and a lower flange that are split in half. The top of the upper flange is integrally fixed to the bottom of the outer gear ring housing 1. The upper flange 15 has an upwardly recessed semi-circular through groove 12, and the lower flange has a downwardly recessed semi-circular through groove. The upper flange and the lower flange together form a circular clamping through groove, and bolt through holes 13 are provided at the four corners of the upper flange and bolts are used to achieve uniform locking. When the bolts are tightened uniformly, the circular clamping through groove formed by the upwardly recessed semi-circular through groove at the bottom of the housing and the downwardly recessed semi-circular through groove of the lower flange shrinks synchronously, forming a quick-installation mechanism for rigidly clamping and fixing the entire deceleration device to the external rod.

[0034] This device features an integrated design, ensuring smooth and reliable transmission. Through the cooperation of the semi-enclosed bottom shell and clamping device, it achieves a rapid and rigid connection with the airframe components. This design significantly reduces system weight and simplifies the assembly process while maintaining transmission efficiency, providing a compact, rigid, and easy-to-deploy power transmission solution for multi-rotor aircraft.

[0035] Furthermore, the outer gear ring housing 1 is integrally formed using 3D printing technology, with a wall thickness of 4mm; the horizontal partition 16 has a thickness of 3mm.

[0036] Furthermore, a wire hole 14 is provided on the side wall of the motor cavity. The wire hole 14 is used to connect the drive motor 4 to the external power supply and control system, which not only ensures the structural strength but also achieves lightweight design.

[0037] This application also provides a method for operating a compact dual planetary gear electric rotor reduction device, such as... Figures 1 to 5 As shown, when the drive motor 4 starts, power is transmitted to the sun gear 2 via the sun gear shaft 21. The sun gear 2 drives the planetary gears 3, symmetrically arranged on both sides, to perform planetary motion within the internal gear ring of the outer gear ring housing 1. Since the outer gear ring housing 1 is stationary, the planetary gears 3 rotate on their own axes while revolving around the sun gear 2, transmitting the reduced power to the rotor via the planetary gear shaft 31. This transmission system achieves a fixed reduction ratio within the range of 2.5-6, converting the high-speed rotation of the motor into the operating speed required by the rotor blades. When disassembly and maintenance are required, simply loosening the four sets of bolts at the flange corners allows the entire reduction gear to be removed from the rod, greatly simplifying the maintenance process.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the protection scope of the present invention.

Claims

1. A compact dual-planetary-gear electric rotor reduction gear, characterized in that: It includes an external gear ring housing, a sun gear, two planetary gears, a drive motor, and a clamping device; The outer gear ring housing is a semi-enclosed structure with an opening at the top and a rotor base plate at the bottom. The outer gear ring housing is assembled with the rotor base plate to form a complete transmission chamber. The outer gear ring housing is divided into an upper gear cavity and a lower motor cavity by a horizontal partition. The drive motor is installed inside the motor cavity and fixed to the bottom of the horizontal partition with screws; Internal teeth are formed on the circumferential side of the inner wall of the gear cavity; The sun gear and two planet gears are located inside the gear cavity, forming a complete planetary transmission system; The clamping device is formed at the bottom of the outer gear ring housing, and it is quickly connected to the external rod by bolts.

2. The compact dual planetary gear electric rotor reduction device according to claim 1, characterized in that: The sun gear is located at the center of the gear cavity, and two planet gears are symmetrically arranged on both sides of the sun gear. The planet gears mesh with the external teeth of the sun gear and the internal teeth of the gear cavity, respectively, thus forming a complete planetary transmission system.

3. The compact dual planetary gear electric rotor reduction device according to claim 2, characterized in that: The horizontal partition has a central through hole and four symmetrically distributed motor mounting holes. The lower end of the sun gear shaft at the center of the sun gear passes through the central through hole and connects to the output shaft of the drive motor. Screws pass through the motor mounting holes to fix the drive motor body to the bottom of the horizontal partition.

4. The compact dual planetary gear electric rotor reduction device according to claim 3, characterized in that: The planetary gear shafts at the center of the two planetary gears extend upwards, pass through the positioning and mounting holes of the rotor, and are then fixed by planetary gear bearings to fix the axial displacement, so as to output the decelerated power to the rotor.

5. The compact dual planetary gear electric rotor reduction device according to claim 4, characterized in that: The upper end of the sun gear shaft is supported and positioned by the sun gear bearing. The upper ends of the planet gear shafts at the centers of the two planet gears are also supported by planet gear bearings. The sun gear bearing and the planet gear bearings together form an axial positioning system, which stably clamps the rotor blades between the outer gear ring housing and the planet gear bearings, ensuring the precise alignment and smooth operation of the transmission system.

6. The compact dual planetary gear electric rotor reduction device according to claim 2, characterized in that: The reduction ratio of the device ranges from 2.5 to 6.

7. The compact dual planetary gear electric rotor reduction device according to claim 6, characterized in that: The reduction ratio of the device is 4.

5.

8. The compact dual planetary gear electric rotor reduction device according to claim 1, characterized in that: The clamping device includes an upper flange and a lower flange that are split in half. The top of the upper flange is integrally fixed to the bottom of the outer gear ring housing. The upper flange has an upwardly recessed semi-circular through groove, and the lower flange has a downwardly recessed semi-circular through groove. The upper flange and the lower flange together form a circular clamping through groove, and bolt through holes are opened at the four corners of the flange, and bolts are used to achieve uniform locking.

9. The compact dual planetary gear electric rotor reduction device according to claim 1, characterized in that: The outer gear ring housing is integrally formed using 3D printing technology, with a wall thickness of 4mm; the horizontal partition thickness is 3mm.

10. The compact dual planetary gear electric rotor reduction device according to claim 1, characterized in that: The motor cavity sidewall has wire holes for connecting the drive motor to an external power source and control system.

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