Coaxial reversal rotor speed reducer and helicopter

Abstract

The utility model relates to the technical field of aircrafts, in particular to a coaxial reversal rotor speed reducer and a helicopter. The coaxial reverse rotor speed reduction device comprises a casing, a rotor unit and a speed reduction unit, the rotor unit comprises a rotor inner shaft and a rotor outer shaft, the speed reduction unit comprises a power input assembly and a rotor driving assembly, and the rotor driving assembly comprises a first face gear arranged on the rotor inner shaft and a second face gear arranged on the rotor outer shaft. The first cylindrical gear is meshed with the first face gear and the second face gear, and after the power input assembly drives the first cylindrical gear to rotate, the rotor wing inner shaft and the rotor wing outer shaft rotate in opposite directions. The large speed ratio of the whole machine can be achieved, the transmission ratio is stable, the face gear does not need to be matched with a cylindrical gear to be machined and used, and therefore the machining and maintaining cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft, in particular to a coaxial contra-rotating rotor reduction device and a helicopter. Background Technique

[0002] At present, helicopters are one of the main forces in the general aviation field. They usually have unique vertical takeoff and landing capabilities, can hover in the air, fly in any direction forward, backward, left, or right, and can also take off and land on unprepared sites or rooftop platforms, which cannot be replaced by fixed-wing aircraft and other transportation tools. Among them, the transmission system of coaxial contra-rotating rotor helicopters is the high point in the development of the aircraft transmission field. Two sets of coaxial rotors with opposite rotations up and down are used to balance the torque, and the heading control is achieved by generating an unbalanced torque through the differential of the total pitch of the upper and lower rotors. That is, the power of the engine is transmitted to the dual rotors. During the flight of the helicopter, the coaxial dual rotors are both lift surfaces and longitudinal, lateral, and heading control surfaces, which can break through the speed limit of conventional configuration helicopters. The quality of its performance directly affects the life, weight, reliability, etc. of the rotor helicopter.

[0003] At present, the transmission system of coaxial contra-rotating rotor helicopters uses bevel gear transmission, and the coaxial reverse rotation output of the inner and outer rotor shafts is realized through the meshing of two pairs of bevel gears. However, the coaxial reverse rotation of bevel gears has obvious disadvantages: (1) Bevel gears are usually manufactured and used in pairs, and the interchangeability of parts is poor. They need to be replaced in pairs, resulting in high maintenance costs, difficult maintenance, and long cycles; (2) The transmission ratio of bevel gears is small. The transmission ratio of a single-stage bevel gear transmission is generally within 3, resulting in the inability to increase the overall machine speed ratio under the original volume, and the power density is limited; (3) Due to machining errors and installation errors, the bevel angles cannot coincide, resulting in an inconsistent transmission ratio, unstable transmission, and easy fatigue problems; (4) Multiple pairs of bevel gear pairs are meshed at the same time. Since smaller bevel gears need to bear larger axial forces, the axial forces borne by the bearings are large, the support structure is complex, and the installation and adjustment are difficult. Summary of the Utility Model

[0004] The technical problem to be solved in the embodiments of the utility model is to provide a coaxial contra-rotating rotor reduction device and a helicopter to solve the above-mentioned deficiencies existing in the transmission form of bevel gears in the transmission system of coaxial contra-rotating rotor helicopters in the prior art.

[0005] The utility model discloses a coaxial contra-rotating rotor reduction device, which includes a casing, a rotor unit arranged on the casing, and a reduction unit arranged in the casing. The rotor unit includes a rotor inner shaft and a rotor outer shaft sleeved coaxially with the rotor inner shaft;

[0006] The deceleration unit includes a power input component and a rotor drive component. The rotor drive component includes a first face gear disposed on the inner rotor shaft, a second face gear disposed on the outer rotor shaft, and a first cylindrical gear. The first face gear and the second face gear are disposed opposite to each other. The first cylindrical gear is connected to the power input component and is meshed and driven between the first face gear and the second face gear. The number of teeth on the tooth surfaces of the first face gear and the second face gear is greater than the number of teeth of the first cylindrical gear, so that after the power input component drives the first cylindrical gear to rotate, the inner rotor shaft and the outer rotor shaft of the rotor rotate in opposite directions.

[0007] Optionally, the power input component includes a drive motor, a second cylindrical gear, and a third face gear. The second cylindrical gear is connected to the output end of the drive motor. The axis of the third face gear is perpendicular to the inner rotor shaft, and the tooth surface of the third face gear is tapered. The second cylindrical gear and the third face gear are meshed and driven to form a hypoid gear pair, and the third face gear and the first cylindrical gear are coaxially connected.

[0008] Optionally, the power input component further includes an input gear shaft and a drive gear shaft. The input gear shaft is connected to the output end of the drive motor. The second cylindrical gear is disposed on the input gear shaft, and input support bearings connected to the casing are provided at both ends of the input gear shaft. The third face gear and the first cylindrical gear are both disposed on the drive gear shaft, and drive support bearings connected to the casing are provided at both ends of the drive gear shaft.

[0009] Optionally, the coaxial contra-rotating rotor deceleration device includes multiple groups of the power input components, and each group of the power input components is correspondingly connected to the first cylindrical gear.

[0010] Optionally, the deceleration unit further includes a transmission stability component. The transmission stability component includes a transmission gear shaft and an idler gear disposed on the transmission gear shaft. Transmission support bearings connected to the casing are provided at both ends of the transmission gear shaft. The idler gear is located between the first face gear and the second face gear, and the idler gear is meshed with both the first face gear and the second face gear.

[0011] Optionally, the coaxial contra-rotating rotor speed reduction device further includes a first web plate disposed within the casing on the inner rotor shaft, and a second web plate disposed within the casing on the outer rotor shaft. A first support bearing connecting the casing is provided on the first web plate, and the first face gear is disposed on the first web plate. A second support bearing connecting the casing is provided on the second web plate, and the second face gear is disposed on the second web plate. A double-axis support bearing is further provided between the outer rotor shaft and the inner rotor shaft.

[0012] Optionally, the first web plate is an annular plate coaxial with the inner rotor shaft, and the cross-section of the first web plate is an inverted conical structure. The outer edge of the top annular hole of the first web plate extends horizontally outward to form a first support plate. The first face gear is disposed on the top surface of the first support plate. The outer edge of the bottom annular hole of the first web plate extends vertically downward to form a first sleeve corresponding to the inner rotor shaft. The first sleeve is fixedly connected to the inner rotor shaft, and the first support bearing is disposed on the outer wall of the first sleeve.

[0013] Optionally, the second web plate is an annular plate coaxial with the outer rotor shaft, and the cross-section of the second web plate is a positive conical structure. The outer edge of the top annular hole of the second web plate extends vertically upward to form a second sleeve corresponding to the outer rotor shaft. The second sleeve is fixedly connected to the outer rotor shaft, and the second support bearing is disposed on the outer wall of the second sleeve. The outer edge of the bottom annular hole of the second web plate extends horizontally outward to form a second support plate, and the second face gear is disposed on the second support plate.

[0014] Optionally, a plurality of heat dissipation through holes are formed in the plate surfaces of the first web plate and the second web plate along the circumferential direction.

[0015] The present utility model also discloses a helicopter, which adopts the above coaxial contra-rotating rotor speed reduction device. The helicopter includes a fuselage and the coaxial contra-rotating rotor speed reduction device disposed on the fuselage.

[0016] Compared with the prior art, the beneficial effects of the coaxial contra-rotating rotor speed reduction device and the helicopter provided by the embodiments of the present utility model are as follows:

[0017] By setting the rotor unit and the speed reduction unit, the first face gear on the inner rotor shaft and the second face gear on the outer rotor shaft are arranged oppositely, and the first cylindrical gear is meshed between the first face gear and the second face gear. Power is input through the power input component to drive the first cylindrical gear to rotate, so as to drive the first face gear and the second face gear to rotate in opposite directions simultaneously, thereby realizing the opposite rotation directions of the inner rotor shaft and the outer rotor shaft. The transmission mode of the first cylindrical gear and the two face gears is adopted, and the number of teeth on the tooth surfaces of the first face gear and the second face gear is set to be greater than the number of teeth of the first cylindrical gear, so that a large transmission ratio is formed between the two face gears and the first cylindrical gear, realizing a larger speed ratio of the whole machine. Its transmission ratio is stable, and the power density is effectively improved. At the same time, compared with bevel gear transmission, the axial position error of the first cylindrical gear has little influence on the transmission performance, and no anti-displacement design is required, which greatly reduces the installation time of the device. And because the first cylindrical gear will be fatigued and damaged prior to the face gear due to high speed during transmission, only the first cylindrical gear needs to be replaced and repaired, so that the face gear does not need to be processed and used in pair with the first cylindrical gear, thus greatly reducing the processing and maintenance costs. Brief Description of the Drawings

[0018] The technical solutions of the present utility model will be further described in detail below in conjunction with the drawings and embodiments. In the drawings:

[0019] Figure 1 is the overall structural schematic diagram of the coaxial contra-rotating rotor speed reduction device provided by the embodiment of the present utility model;

[0020] Figure 2 is the assembly structural schematic diagram of the coaxial contra-rotating rotor speed reduction device provided by the embodiment of the present utility model;

[0021] Figure 3 is the top view of the coaxial contra-rotating rotor speed reduction device provided by the embodiment of the present utility model.

[0022] The reference numerals in the drawings are as follows:

[0023] 1, rotor unit; 11, inner rotor shaft; 12, outer rotor shaft; 2, power input component; 21, second cylindrical gear; 22, third face gear; 23, input gear shaft; 231, input support bearing; 24, drive gear shaft; 241, drive support bearing; 3, rotor drive component; 31, first face gear; 32, second face gear; 33, first cylindrical gear; 4, transmission stability component; 41, transmission gear shaft; 42, idler gear; 43, transmission support bearing; 5, first web; 51, first support bearing; 52, first support plate; 53, first sleeve; 6, second web; 61, second support bearing; 62, second sleeve; 63, second support plate; 7, heat dissipation through hole. Detailed Embodiment

[0024] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. Now, in conjunction with the accompanying drawings, detailed descriptions of the preferred embodiments of the present utility model will be given.

[0025] The present utility model discloses a coaxial contra-rotating rotor speed reduction device, as Figure 1 and Figure 2 shown, which includes a casing, a rotor unit 1 arranged on the casing, and a speed reduction unit arranged inside the casing. The rotor unit 1 includes a rotor inner shaft 11 and a rotor outer shaft 12 sleeved coaxially with the rotor inner shaft 11. The speed reduction unit includes a power input assembly 2 and a rotor drive assembly 3. The rotor drive assembly 3 includes a first face gear 31 arranged on the rotor inner shaft 11, a second face gear 32 arranged on the rotor outer shaft 12, and a first cylindrical gear 33. The first face gear 31 and the second face gear 32 are arranged oppositely, the first cylindrical gear 33 is connected with the power input assembly 2, and the first cylindrical gear 33 is located between the first face gear 31 and the second face gear 32 for meshing drive. The number of teeth on the tooth surfaces of the first face gear 31 and the second face gear 32 is greater than the number of teeth of the first cylindrical gear 33, so that after the power input assembly 2 drives the first cylindrical gear 33 to rotate, the rotor inner shaft 11 and the rotor outer shaft 12 rotate in opposite directions.

[0026] By implementing the above-mentioned coaxial counter-rotating rotor reduction gear, a coaxially sleeved rotor inner shaft 11 and a rotor outer shaft 12 are provided, and a first face gear 31 on the rotor inner shaft 11 and a second face gear 32 on the rotor outer shaft 12 are arranged relative to each other. A first cylindrical gear 33 is positioned between the first face gear 31 and the second face gear 32 and meshes with each other. Power is input through the power input assembly 2 to drive the first cylindrical gear 33 to rotate, thereby simultaneously driving the first face gear 31 and the second face gear 32 to rotate in opposite directions, thereby achieving synchronous counter-rotation of the rotor inner shaft 11 and the rotor outer shaft 12. Therefore, a transmission mode is adopted in which the first cylindrical gear 33 meshes with the two face gears, and the number of teeth on the tooth surfaces of the first face gear 31 and the second face gear 32 is set to be greater than the number of teeth on the first cylindrical gear 33, so that a large transmission ratio is formed between the two face gears and the first cylindrical gear 33. The transmission ratio can be adjusted as needed, so that the maximum transmission ratio can reach 20, thereby achieving a larger speed ratio of the entire machine, with a stable transmission ratio and effectively improving the power density. At the same time, compared to a two-bevel gear transmission, the axial position error of the first cylindrical gear 33 has almost no effect on transmission performance, eliminating the need for anti-misalignment design, significantly reducing the device's installation time. Furthermore, because the first cylindrical gear 33 will fatigue and fail before the face gears due to its high speed during transmission, only the first cylindrical gear 33 needs to be replaced or repaired. This eliminates the need for the face gears to be paired with the first cylindrical gear 33 for processing and use, significantly reducing processing and maintenance costs. Furthermore, through actual experimental testing, during the transmission process between the first cylindrical gear 33 and the two face gears, the overlap between the first face gear 31 and the second face gear 32 generally reaches 1.6 to 1.8 under no-load conditions. Theoretically, the overlap can reach over 2, and even higher under load, effectively ensuring smoother transmission. And based on the above structure, when the first cylindrical gear 33 is a spur gear, there is no axial force acting on it, while when the first cylindrical gear 33 is a helical gear, it can withstand a slight axial force. By utilizing this feature, the support can be simplified and the mass of the entire coaxial inverted rotor reduction device can be reduced. Due to the reduction in mass, the inertial force will also be reduced accordingly, thereby reducing the load on the supporting structure and correspondingly increasing the load-bearing capacity of the coaxial inverted rotor reduction device.

[0027] Further, combined with Figure 3 As shown, the power input assembly 2 includes a drive motor, a second cylindrical gear 21, and a third face gear 22. The second cylindrical gear 21 is connected to the output of the drive motor. The axis of the third face gear 22 is perpendicular to the rotor inner shaft 11, and the gear teeth of the third face gear 22 are tapered. The second and third face gears 21 and 22 mesh and drive each other, forming a small-axis angle gear pair. The third face gear 22 is coaxially connected to the first cylindrical gear 33.

[0028] Through the implementation of the above coaxial contra-rotating rotor speed reduction device, the driving motor is connected to the second cylindrical gear 21, and through the meshing drive of the second cylindrical gear 21 and the third face gear 22, and the coaxial transmission of the third face gear 22 and the first cylindrical gear 33, the power is transmitted to the first cylindrical gear 33 to realize the first cylindrical gear 33 driving the first face gear 31 and the second face gear 32 to rotate in opposite directions simultaneously, ensuring stable power input. At the same time, the tooth surface of the third face gear 22 is set to be tapered, so that a small shaft intersection angle gear pair is formed between the second cylindrical gear 21 and the third face gear 22, which can change the direction of power transmission, that is, by adjusting the angle of the shaft intersection angle to adapt to power input in different directions, increasing the meshing stability and strength of the gear pair, and making the spatial layout of the coaxial contra-rotating rotor speed reduction device in this embodiment more flexible. Among them, the third face gear 22 in this embodiment only has a tapered tooth surface, and its tooth profile still cooperates with the tooth of the conventional cylindrical gear, so it is still used as a face gear, rather than a traditional bevel gear. As is well known, bevel gears can only cooperate with bevel gears, so the traditional bevel gears do not have the technical effects achieved by the application of the third face gear 22 in this embodiment. That is, a large transmission ratio is also formed between the second cylindrical gear 21 and the third face gear 22 to achieve a larger overall speed ratio, with a stable transmission ratio and effectively improving the power density. At the same time, compared with the transmission of two bevel gears, the axial position error of the second cylindrical gear 21 has little effect on the transmission performance, and no anti-displacement design is required, greatly reducing the installation time of the device. And because the second cylindrical gear 21 will be fatigued and damaged prior to the face gear due to high speed during transmission, only the second cylindrical gear 21 needs to be replaced and repaired, so that the third face gear 22 does not need to be processed and used in pair with the second cylindrical gear 21, thus greatly reducing the processing and maintenance costs.

[0029] Further, the power input component 2 further includes an input gear shaft 23 and a driving gear shaft 24. The input gear shaft 23 is connected to the output end of the driving motor, the second cylindrical gear 21 is arranged on the input gear shaft 23, and input support bearings 231 connected to the casing are arranged at both ends of the input gear shaft 23. The third face gear 22 and the first cylindrical gear 33 are both arranged on the driving gear shaft 24, and driving support bearings 241 connected to the casing are arranged at both ends of the driving gear shaft 24.

[0030] Through the implementation of the above-described coaxial counter-rotating rotor reduction gear, the input gear shaft 23 is connected to the output end of the drive motor to transmit the drive motor's power to the second cylindrical gear 21 on the input gear shaft 23. The input support bearing 231 on the input gear shaft 23 connects the input gear shaft 23 to the casing, allowing the input gear shaft 23 to rotate stably relative to the casing after being driven, thereby achieving stable support and rotation of the input gear shaft 23. Similarly, when the second cylindrical gear 21 engages and drives the third face gear 22 to rotate, the drive gear shaft 24 synchronously drives the first cylindrical gear 33 to rotate. The drive support bearing 241 on the drive gear shaft 24 connects the input gear shaft 24 to the casing, allowing the drive gear shaft 24 to rotate stably relative to the casing after being driven, thereby achieving stable support and rotation of the drive gear shaft 24. This ensures that power is smoothly transmitted from the drive motor to the rotor unit 1, while the support and connection of each shaft are stable and reliable, thereby improving the operational stability and reliability of the entire reduction gear unit.

[0031] Furthermore, the coaxial counter-rotating rotor reduction device includes a plurality of power input assemblies 2 , and each power input assembly 2 is connected to a first cylindrical gear 33 in a one-to-one correspondence.

[0032] By implementing the above-mentioned coaxial counter-rotating rotor reduction device, multiple sets of power input components 2 are set up to increase the output of multiple ends, thereby increasing the stability of the entire transmission system and improving the load-sharing performance of the first face gear 31 and the second face gear 32.

[0033] The reduction unit further includes a transmission stabilization assembly 4. This assembly includes a transmission gear shaft 41 and an idler gear 42 mounted on the transmission gear shaft. Transmission support bearings 43 connected to the casing are located at both ends of the transmission gear shaft 41. The idler gear 42 is positioned between the first face gear 31 and the second face gear 32, meshing with both the first face gear 31 and the second face gear 32.

[0034] Through the implementation of the above coaxial contra-rotating rotor deceleration device, the two ends of the transmission gear shaft 41 are connected to the casing through the transmission support bearings 43, ensuring the stable support and rotation of the transmission gear shaft 41. The idler gear 42 is located between the first face gear 31 and the second face gear 32 and meshes with them simultaneously to transmit power and change the direction of rotation. This enables the power to be stably transmitted between the first face gear 31 and the second face gear 32, while also changing the direction of power transmission to meet the power requirements of the rotor system. In this embodiment, the idler gear 42 and the first cylindrical gear 33 are located on both sides of the central axis of the first face gear 31 to increase the load-bearing at one end, thereby increasing the stability of the entire transmission system and improving the load-sharing performance of the first face gear 31 and the second face gear 32. Moreover, the transmission stability component 4 in this embodiment does not participate in changing the transmission ratio. In addition, by setting the idler gear 42, the impact and vibration in gear transmission can be reduced, improving the running smoothness and reliability of the entire deceleration unit.

[0035] Furthermore, the coaxial contra-rotating rotor deceleration device further includes a first web 5 located inside the casing and arranged on the inner rotor shaft 11, and a second web 6 located inside the casing and arranged on the outer rotor shaft 12. A first support bearing 51 for connecting the casing is provided on the first web 5, and the first face gear 31 is arranged on the first web 5. A second support bearing 61 for connecting the casing is provided on the second web 6, and the second face gear 32 is arranged on the second web 6. A double-axis support bearing is also provided between the outer rotor shaft 12 and the inner rotor shaft 11.

[0036] Through the implementation of the above coaxial contra-rotating rotor deceleration device, it is set that the first web 5 can rotate relative to the casing through the first support bearing 51, and the first web 5 connects the inner rotor shaft 11 and the first face gear 31 to achieve stable support and rotation of the inner rotor shaft 11 and the first face gear 31. That is, when the first face gear 31 is driven to rotate, it drives the first web 5 to rotate synchronously, thereby driving the inner rotor shaft 11 to rotate synchronously, enabling the first web 5 to transmit the power of the first face gear 31 to the inner rotor shaft 11, ensuring the stability of the transmission, and avoiding wear or damage caused by direct contact between the first face gear 31 and the inner rotor shaft 11, thereby increasing its service life. Similarly, it is set that the second web 6 can rotate relative to the casing through the second support bearing 61, and the second web 6 connects the outer rotor shaft 12 and the second face gear 32 to achieve stable support and rotation of the outer rotor shaft 12 and the second face gear 32. That is, when the second face gear 32 is driven to rotate, it drives the second web 6 to rotate synchronously, thereby driving the outer rotor shaft 12 to rotate synchronously, enabling the second web 6 to transmit the power of the second face gear 32 to the outer rotor shaft 12. In addition, by using a double-axis support bearing arranged between the outer rotor shaft 12 and the inner rotor shaft 11, the stability of the support and relative rotation between the inner rotor shaft 11 and the outer rotor shaft 12 can be further enhanced, enabling the inner rotor shaft 11 and the outer rotor shaft 12 to rotate stably, and improving the overall performance and reliability of the coaxial contra-rotating rotor deceleration device.

[0037] Furthermore, the first web 5 is an annular plate coaxial with the inner rotor shaft 11, and the cross-section of the first web 5 is an inverted conical structure. The outer edge of the top ring hole of the first web 5 extends horizontally outward to form a first support plate 52, and the first face gear 31 is cooperatively arranged on the top surface of the first support plate 52. The outer edge of the bottom ring hole of the first web 5 extends vertically downward to form a first sleeve 53 corresponding to the inner rotor shaft 11, and the first sleeve 53 is fixedly connected to the inner rotor shaft 11, and the first support bearing is arranged on the outer wall of the first sleeve 53.

[0038] Through the implementation of the above coaxial contra-rotating rotor deceleration device, by using the annular structure of the first web 5 coaxial with the inner rotor shaft 11, the rotation centers of the first web 5 and the inner rotor shaft 11 are the same, which can ensure smooth power transmission between the first web 5 and the inner rotor shaft 11, reducing vibration and energy loss. And by using the inverted conical cross-sectional structure of the first web 5, the strength of the first web 5 can be increased, enabling it to better bear the load and torque of the first face gear 31, further ensuring smoother power transmission between the first web 5 and the inner rotor shaft 11. At the same time, the first support plate 52 at the top of the first web 5 facilitates the installation and fixation of the first face gear 31, and the first sleeve 53 at the bottom of the first web 5 facilitates fixed transmission with the inner rotor shaft 11, so as to increase the connection strength and rigidity between the first web 5, the first face gear and the inner rotor shaft 11, ensuring the stability of the transmission of the first web 5.

[0039] Furthermore, the second web 6 is an annular plate coaxial with the outer rotor shaft 12, and the cross-section of the second web 6 is a positive conical structure. The outer edge of the annular hole at the top of the second web 6 extends vertically upward to form a second sleeve 62 corresponding to and sleeved on the outer rotor shaft 12, and the second sleeve 62 is fixedly connected to the outer rotor shaft 12. The second support bearing is arranged on the outer wall of the second sleeve 62, and the outer edge of the annular hole at the bottom of the second web 6 extends horizontally outward to form a second support plate 63. The second face gear 32 is cooperatively arranged on the second support plate 63.

[0040] Through the implementation of the above coaxial contra-rotating rotor deceleration device, by using the annular structure of the second web 6 coaxial with the outer rotor shaft 12, the rotation centers of the second web 6 and the outer rotor shaft 12 are the same, which can ensure smooth power transmission between the second web 6 and the outer rotor shaft 12, reducing vibration and energy loss. And by using the positive conical cross-sectional structure of the second web 6, the second web 6 corresponds to the first web 5 and the strength of the second web 6 is increased, enabling it to better bear the load and torque of the second face gear 32, further ensuring smoother power transmission between the second web 6 and the outer rotor shaft 12. At the same time, the second support plate 63 at the bottom of the second web 6 facilitates the installation and fixation of the second face gear 32, and the second sleeve 62 at the top of the second web 6 facilitates fixed transmission with the outer rotor shaft 12, so as to increase the connection strength and rigidity between the second web 6, the second face gear and the outer rotor shaft 12, ensuring the stability of the transmission of the second web 6.

[0041] Furthermore, a plurality of heat dissipation through holes 7 are formed in the plate surfaces of the first web 5 and the second web 6 along the circumferential direction.

[0042] Through the implementation of the above coaxial contra-rotating rotor deceleration device, by means of the heat dissipation through holes 7 provided on the first web 5 and the second web 6, the air circulation inside the casing can be increased, so that the heat that may be generated during the rotation of the outer rotor shaft 12 and the inner rotor shaft 11 is dissipated through the heat dissipation holes, which helps to improve the reliability and durability of the rotation of the outer rotor shaft 12 and the inner rotor shaft 11. And by opening holes on the first web 5 and the second web 6, it helps to reduce the use of materials, thereby reducing the weight of the entire coaxial contra-rotating rotor deceleration device, so as to improve the output power of the coaxial contra-rotating rotor deceleration device.

[0043] The present utility model also discloses a helicopter, which adopts the above coaxial contra-rotating rotor deceleration device. The helicopter includes a fuselage and a coaxial contra-rotating rotor deceleration device provided on the fuselage.

[0044] Through the implementation of the above helicopter, by using the coaxial contra-rotating rotor deceleration device, the outer rotor shaft 12 and the inner rotor shaft 11 can rotate in opposite directions, and the torque of the outer rotor shaft 12 and the inner rotor shaft 11 can be effectively increased, thereby improving the flight efficiency of the helicopter, so that the helicopter of the embodiment of the present utility model can obtain a higher lift under the same power.

[0045] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some of the technical features can be equivalently replaced; and all such modifications and replacements should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A coaxial contra-rotating rotor deceleration device, characterized in that: The coaxial contra-rotating rotor reduction device includes a casing, a rotor unit arranged on the casing, and a reduction unit arranged in the casing. The rotor unit includes a rotor inner shaft and a rotor outer shaft coaxially sleeved with the rotor inner shaft; The reduction unit includes a power input component and a rotor driving component. The rotor driving component includes a first face gear arranged on the rotor inner shaft, a second face gear arranged on the rotor outer shaft, and a first cylindrical gear. The first face gear and the second face gear are arranged oppositely. The first cylindrical gear is connected with the power input component, and the first cylindrical gear is located between the first face gear and the second face gear and drives them meshingly. The number of teeth on the tooth surfaces of the first face gear and the second face gear is greater than the number of teeth of the first cylindrical gear, so that after the power input component drives the first cylindrical gear to rotate, the rotor inner shaft and the rotor outer shaft rotate in opposite directions.

2. The coaxial contra-rotating rotor deceleration device according to claim 1, characterized in that: The power input component includes a driving motor, a second cylindrical gear, and a third face gear. The second cylindrical gear is connected with the output end of the driving motor. The axis of the third face gear is perpendicular to the rotor inner shaft, and the tooth surface of the third face gear is tapered. The second cylindrical gear and the third face gear drive and mesh with each other to form a hypoid gear pair, and the third face gear is coaxially connected with the first cylindrical gear.

3. The coaxial contra-rotating rotor deceleration device according to claim 2, wherein: The power input component further includes an input gear shaft and a driving gear shaft. The input gear shaft is connected with the output end of the driving motor. The second cylindrical gear is arranged on the input gear shaft, and input support bearings connected with the casing are arranged at both ends of the input gear shaft. The third face gear and the first cylindrical gear are both arranged on the driving gear shaft, and driving support bearings connected with the casing are arranged at both ends of the driving gear shaft.

4. The coaxial contra-rotating rotor deceleration device according to claim 1, characterized in that: The coaxial contra-rotating rotor reduction device includes multiple groups of the power input components, and each group of the power input components is correspondingly connected with a first cylindrical gear.

5. The coaxial contra-rotating rotor deceleration device according to claim 1, characterized in that: The reduction unit further includes a transmission stability component. The transmission stability component includes a transmission gear shaft and an idler gear arranged on the transmission gear shaft. Transmission support bearings connected with the casing are arranged at both ends of the transmission gear shaft. The idler gear is located between the first face gear and the second face gear, and the idler gear meshes with both the first face gear and the second face gear at the same time.

6. The coaxial contra-rotating rotor deceleration device according to any one of claims 1-5, characterized in that: The coaxial contra-rotating rotor reduction device further includes a first web plate arranged on the rotor inner shaft in the casing and a second web plate arranged on the rotor outer shaft in the casing. A first support bearing connecting the casing is arranged on the first web plate, and the first face gear is arranged on the first web plate. A second support bearing connecting the casing is arranged on the second web plate, and the second face gear is arranged on the second web plate. A double-shaft support bearing is further arranged between the rotor outer shaft and the rotor inner shaft.

7. The coaxial contra-rotating rotor deceleration device according to claim 6, characterized in that: The first web is an annular plate coaxial with the inner rotor shaft, and the cross-section of the first web is an inverted conical structure. An outer edge of a top ring hole of the first web horizontally extends outward to form a first support plate, and the first face gear is disposed on a top surface of the first support plate. An outer edge of a bottom ring hole of the first web vertically extends downward to form a first sleeve sleeved corresponding to the inner rotor shaft, and the first sleeve is fixedly connected to the inner rotor shaft. The first support bearing is disposed on an outer wall of the first sleeve.

8. The coaxial contra-rotating rotor deceleration device according to claim 7, characterized in that: The second web is an annular plate coaxial with the outer rotor shaft, and the cross-section of the second web is a regular conical structure. An outer edge of a top ring hole of the second web vertically extends upward to form a second sleeve sleeved corresponding to the outer rotor shaft, and the second sleeve is fixedly connected to the outer rotor shaft. The second support bearing is disposed on an outer wall of the second sleeve. An outer edge of a bottom ring hole of the second web horizontally extends outward to form a second support plate, and the second face gear is disposed on the second support plate.

9. The coaxial contra-rotating rotor deceleration device according to claim 6, characterized in that: A plurality of heat dissipation through holes are formed in the plate surfaces of the first web and the second web along a circumferential direction.

10. A helicopter, characterized in that, Using the coaxial contra-rotating rotor speed reduction device according to any one of claims 1-9: The helicopter includes a fuselage and the coaxial contra-rotating rotor speed reduction device disposed on the fuselage.

Images