Low-rotating-speed high-power-to-weight-ratio driving device suitable for new energy

Abstract

The invention belongs to the technical field of integrated electric driving systems, and particularly relates to a low-rotating-speed and high-power-to-weight-ratio driving device suitable for new energy. Comprising a mounting structure (18), a controller (19), a radiator assembly (20), a deceleration system (21), a motor assembly (22), a rotor shaft assembly (23) and a main case (24), the motor assembly (22) is arranged above the deceleration system (21), the motor assembly (22) decelerates and transmits the high rotating speed of a motor to the rotor shaft assembly (23) through the deceleration system (21), and the rotor shaft assembly (23) outputs the low rotating speed to drive a rotor system; the lubricating oil pool (32) is located on the right side of the main machine box (24), the main machine box (24) wraps the motor assembly (22) and the speed reduction system (21), the main machine box (24) and the controller (19) are fixed through a stud assembly, and the radiator assembly (20) is fixed to the main machine box (24) and arranged below the whole driving device. And the mounting structure (18) is fixed on the main case (24) through a screw.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated electric drive systems, and in particular relates to a low-speed and high-power-to-weight ratio drive device suitable for new energy. Background Art

[0002] China has made significant achievements in the new energy industry. With the development of electrification, helicopters will also usher in new opportunities. Unlike traditional helicopters, which are powered by fuel, new energy helicopters are powered by electricity. New energy helicopters are also called electric vertical take-off and landing aircraft. The drive device is an important component of the electric vertical take-off and landing aircraft. Its main function is to convert electrical energy into mechanical energy, output a specified speed and power to drive the rotor, and transfer the load generated by the rotor to the body structure. Most of the domestic electric vertical take-off and landing aircraft drive devices are direct-drive electric drive devices, that is, the rotor is directly driven by the motor. However, due to the low speed and high torque of the electric vertical take-off and landing aircraft rotors and the need for a drive device to transfer the rotor load to the body structure, the direct-drive electric drive device has a low power-to-weight ratio. Summary of the invention

[0003] Purpose of the invention: To provide a low-speed and high-power-to-weight ratio drive device suitable for new energy.

[0004] Technical solution:

[0005] A low-speed, high-power-to-weight ratio drive device suitable for new energy sources includes: a mounting structure 18, a controller 19, a radiator assembly 20, a reduction system 21, a motor assembly 22, a rotor shaft assembly 23, and a main engine box 24, wherein:

[0006] The motor assembly 22 is arranged above the reduction system 21. The motor assembly 22 transmits the high speed of the motor to the rotor shaft assembly 23 through the reduction system 21. The rotor shaft assembly 23 outputs the low speed to drive the rotor system; the lubricating oil pool 32 is located on the right side of the main casing 24. When the entire drive device is in a vertical state, the motor assembly 22 is located at the top of the drive device and the lubricating oil is located at the bottom. When the entire drive device tilts to the right and turns to a horizontal state, the lubricating oil flows to the lubricating oil pool 32. The motor assembly 22 is away from the lubricating oil in both states, which can prevent high speed The motor rotor 1 contacts the lubricating oil, thereby avoiding a large oil stirring loss, improving the transmission efficiency of the drive device, and improving the power-to-weight ratio of the drive device; the main frame 24 envelops the motor assembly 22 and the reduction system 21, the main frame 24 and the controller 19 are fixed by a screw assembly, and the radiator assembly 20 is fixed to the main frame 24, and is arranged below the entire drive device, away from the center of the rotor, and uses the downward airflow of the rotor to dissipate heat, thereby improving the heat dissipation efficiency of the radiator; the mounting structure 18 is fixed to the main frame 24 by screws, and is used to connect with the tilt mechanism.

[0007] Furthermore, the reduction system 21 is composed of the sun gear 3 , the first planetary gear 4 , the second planetary gear 10 and the inner ring gear 9 to form a NW planetary reduction system.

[0008] Furthermore, the first planetary gear 4 and the second planetary gear 10 form a double planetary gear shaft, which is supported by the first cylindrical roller bearing 12 and the second cylindrical roller bearing 14. The inner gear ring 9 is fixed to the main housing 24 through a screw assembly; the sun gear 3 is connected to the motor rotor 1 through a spline 26.

[0009] Furthermore, the planetary carrier assembly 5 in the reduction system 21 is composed of an upper planetary carrier 27 and a lower planetary carrier 28. The lubricating pump drive gear 6 of the reduction system 21 is arranged between the upper planetary carrier 27 and the lower planetary carrier 28. The lubricating pump drive gear 6, the upper planetary carrier 27 and the lower planetary carrier 28 are fixed by a bolt assembly; the outer ring of the second cylindrical roller bearing 14 is installed on the upper planetary carrier 27, and the first cylindrical roller bearing 12 is installed on the lower planetary carrier 28.

[0010] Furthermore, the oil pump driving gear 6 and the oil pump input gear 7 form a cylindrical gear pair to increase the speed of the oil pump 8 . The input end of the oil pump 8 is connected to the oil pump input gear 7 , and the oil pump input gear 7 is supported by a double-row angular contact ball bearing 25 .

[0011] Furthermore, the lubricating oil pump input gear 7 and the lubricating oil pump 8 are arranged below the lubricating oil pool 32 .

[0012] Furthermore, the rotor shaft assembly 23 is composed of a rotor shaft 17, a first angular contact ball bearing 13, a deep groove ball bearing 15, a second angular contact ball bearing 16, a bearing bushing 29, a first locking nut 30 and a second locking nut 31. The rotor shaft 17 is supported by the first angular contact ball bearing 13 and the second angular contact ball bearing 16. The first locking nut 30 fixes the second angular contact ball bearing 16, and the second locking nut 31 fixes the first angular contact ball bearing 13. The deep groove ball bearing 15 is arranged between the motor rotor 1 and the rotor shaft 17 for rotational support of the motor rotor 1. The bearing bushing 29 is arranged between the inner ring of the deep groove ball bearing 15 and the inner ring of the second angular contact ball bearing 16 for axial positioning of the deep groove ball bearing 15. This configuration simplifies the support structure of the motor rotor 1, reduces the weight of the drive device, and improves the power-to-weight ratio of the drive device.

[0013] Furthermore, the heat sink assembly 20 is fixed to the main housing 24 by screws.

[0014] Beneficial effects:

[0015] The present invention integrates the motor assembly 22, the reduction system 21, the controller 19, the radiator assembly 20, the rotor shaft assembly 23, the main engine box 24, and the mounting structure 18, so that the number of parts and connectors is greatly reduced, the entire configuration is streamlined and compact, and the power-to-weight ratio of the drive device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a low-speed, high-power-to-weight ratio driving device applicable to new energy sources according to an embodiment of the present invention;

[0017] Figure 2 This is a working principle diagram of a low-speed, high-power-to-weight ratio driving device applicable to new energy sources according to an embodiment of the present invention;

[0018] Figure 3 It is a partial structural diagram of a low-speed and high-power-to-weight ratio driving device applicable to new energy sources according to an embodiment of the present invention;

[0019] Figure 4 For the rotor shaft assembly and motor assembly;

[0020] Figure 5 For the NW planet of the deceleration system;

[0021] Figure 6 Planetary carrier and oil pump gear of the reducer system;

[0022] Among them, the motor rotor 1, the motor stator 2, the sun gear 3, the first planetary gear 4, the planetary carrier assembly 5, the lubricating oil pump drive gear 6, the lubricating oil pump input gear 7, the lubricating oil pump 8, the inner ring gear 9, the second planetary gear 10, the controller 11, the first cylindrical roller bearing 12, the first angular contact ball bearing 13, the second cylindrical roller bearing 14, the deep groove ball bearing 15, the second angular contact ball bearing 16, the rotor shaft 17, the mounting structure 18, the controller 19, the radiator assembly 20, the reduction system 21, the motor assembly 22, the rotor shaft assembly 23, the main engine casing 24, the double row angular contact ball bearing 25, the upper spline 26, the half planetary carrier 27, the lower half planetary carrier 28, the bearing bushing 29, the first locking nut 30, the second locking nut 31, and the lubricating oil pool 32. DETAILED DESCRIPTION

[0023] like Figure 1-6 A low-speed, high-power-to-weight ratio drive device suitable for new energy sources is composed of a mounting structure 18, a controller 19, a radiator assembly 20, a reduction system 21, a motor assembly 22, a rotor shaft assembly 23, and a main engine box 24.

[0024] The motor assembly 22 is arranged above the reduction system 21. The motor assembly 22 reduces the high speed of the motor and transmits it to the rotor shaft assembly 23 through the reduction system 21. The rotor shaft assembly 23 outputs a low speed to drive the rotor system.

[0025] The lubricating oil pool 32 is located on the right side of the main casing 24. When the entire drive device is in a vertical state, the motor assembly 22 is located at the top of the drive device and the lubricating oil is located at the bottom. When the entire drive device tilts to the right to a horizontal state, the lubricating oil flows into the lubricating oil pool 32. The motor assembly 22 is away from the lubricating oil in both states, which can prevent the high-speed motor rotor 1 from contacting the lubricating oil, thereby avoiding large oil stirring losses, improving the transmission efficiency of the drive device, and improving the power-to-weight ratio of the drive device.

[0026] The mainframe box 24 envelops the motor assembly 22 and the reduction system 21. The mainframe box 24 and the controller 19 are fixed by a screw assembly. The radiator assembly 20 is fixed to the mainframe box 24 by screws and is arranged below the entire drive device, away from the center of the rotor. The downward airflow of the rotor is used to dissipate heat, thereby improving the heat dissipation efficiency of the radiator.

[0027] The mounting structure 18 is fixed to the main frame 24 by screws and is used to connect with the tilting mechanism.

[0028] The motor assembly 22, the reduction system 21, the controller 19, the radiator assembly 20, the rotor shaft assembly 23, the main engine box 24, the mounting structure 18 and other components are integrated together, so that the number of parts and connectors is greatly reduced.

[0029] The reduction system 21 is composed of a sun gear 3, a first planetary gear 4, a second planetary gear 10 and an inner ring gear 9 to form a NW planetary reduction system, which can achieve a large reducer ratio. Compared with the NGW planetary reduction system, the NW planetary reduction system has a smaller outer dimension and a larger sun gear 3.

[0030] The first planetary gear 4 and the second planetary gear 10 form a double planetary gear shaft, which is supported by the first cylindrical roller bearing 12 and the second cylindrical roller bearing 14. The inner gear ring 9 is fixed to the main housing 24 through a screw assembly; the sun gear 3 is connected to the motor rotor 1 through a spline 26.

[0031] The planetary carrier assembly 5 is composed of an upper planetary carrier 27 and a lower planetary carrier 28. The lubricating oil pump drive gear 6 is arranged between the upper planetary carrier 27 and the lower planetary carrier 28. The lubricating oil pump drive gear 6, the upper planetary carrier 27 and the lower planetary carrier 28 are fixed by a bolt assembly; the outer ring of the second cylindrical roller bearing 14 is installed on the upper planetary carrier 27, and the first cylindrical roller bearing 12 is installed on the lower planetary carrier 28.

[0032] The oil pump driving gear 6 and the oil pump input gear 7 form a cylindrical gear pair, which increases the speed of the oil pump 8. The oil pump 8 is connected to the oil pump input gear 7, and the oil pump input gear 7 is supported by a double-row angular contact ball bearing 25. This configuration can adjust the speed ratio of the cylindrical gear pair arbitrarily to adapt to the speed of the oil pump and meet the lubrication and heat dissipation requirements of the entire drive device. At the same time, this configuration reduces the outer dimensions of the driven device and reduces the weight.

[0033] The lubricating oil pump input gear 7 and the lubricating oil pump 8 are arranged below the lubricating oil pool 32 to facilitate the extraction of lubricating oil and to provide lubrication and heat dissipation for the entire device.

[0034] The rotor shaft assembly 23 is composed of a rotor shaft 17, a first angular contact ball bearing 13, a deep groove ball bearing 15, a second angular contact ball bearing 16, a bearing bushing 29, a first locking nut 30 and a second locking nut 31. The rotor shaft 17 is supported by the first angular contact ball bearing 13 and the second angular contact ball bearing 16. The first locking nut 30 fixes the second angular contact ball bearing 16, and the second locking nut 31 fixes the first angular contact ball bearing 13. The deep groove ball bearing 15 is arranged between the motor rotor 1 and the rotor shaft 17 for rotational support of the motor rotor 1. The bearing bushing 29 is arranged between the inner ring of the deep groove ball bearing 15 and the inner ring of the second angular contact ball bearing 16 for axial positioning of the deep groove ball bearing 15. This configuration simplifies the support structure of the motor rotor 1, reduces the weight of the drive device, and improves the power-to-weight ratio of the drive device.

[0035] The motor assembly 22 of this device is arranged above the reduction system 21. The motor assembly 22 transmits the high speed reduction of the motor to the rotor shaft assembly 23 through the reduction system 21. The rotor shaft assembly 23 outputs the low speed to drive the rotor system. The motor assembly 22, the reduction system 21, the controller 19, the radiator assembly 20, the rotor shaft assembly 23, the main engine box 24, the mounting structure 18 and other components are integrated together, so that the number of parts and connectors is greatly reduced, the whole configuration is streamlined and compact, and the power-to-weight ratio of the drive device is improved. The reduction system is set with NW planetary reduction, which can achieve a large reducer ratio. At the same time, compared with the NGW planetary reduction system, the NW planetary reduction system has a smaller outer dimension and a larger sun gear 3. The lubricating oil pool 32 is located on the right side of the main casing 24, the motor assembly 22 is located at the top of the drive device, and the lubricating oil is located at the bottom. When the entire drive device tilts to the right to a horizontal state, the lubricating oil flows to the lubricating oil pool 32. The motor assembly 22 is away from the lubricating oil in both vertical and horizontal states, which can prevent the high-speed motor rotor 1 from contacting the lubricating oil, thereby avoiding large oil stirring losses, improving the transmission efficiency of the drive device, and improving the power-to-weight ratio of the drive device. The radiator assembly 20 is fixed to the main casing 24 by screws, and is arranged below the entire drive device, away from the center of the rotor, and uses the lower airflow of the rotor for heat dissipation, thereby improving the heat dissipation efficiency of the radiator. The lubricating oil pump driving gear 6 and the lubricating oil pump input gear 7 form a cylindrical gear pair, and the speed increase drives the lubricating oil pump 8. This configuration can arbitrarily adjust the speed increase ratio of the cylindrical gear pair to adapt to the speed of the lubricating oil pump and meet the lubrication and heat dissipation requirements of the entire drive device. At the same time, this configuration reduces the outer dimensions of the driven device and reduces the weight. A deep groove ball bearing 15 is disposed between the motor rotor 1 and the rotor shaft 17 for rotationally supporting the motor rotor 1. This configuration simplifies the support structure of the motor rotor 1, reduces the weight of the drive device, and improves the power-to-weight ratio of the drive device.

[0036] The innovative features of the driving device of the present invention are as follows:

[0037] The motor assembly 22, reduction system 21, controller 19, radiator assembly 20, rotor shaft assembly 23, main engine box 24, mounting structure 18 and other components are integrated together, so that the number of parts and connectors is greatly reduced, the entire configuration is streamlined and compact, and the power-to-weight ratio of the drive device is improved.

[0038] The reduction system is equipped with NW planetary reduction, which can achieve a large reducer ratio. At the same time, compared with the NGW planetary reduction system, the NW planetary reduction system has a smaller outer dimension and a larger sun gear 3.

[0039] The lubricating oil pool 32 is located on the right side of the main casing 24, the motor assembly 22 is located at the top of the drive device, and the lubricating oil is located at the bottom. When the entire drive device tilts to the right to a horizontal state, the lubricating oil flows into the lubricating oil pool 32. The motor assembly 22 is away from the lubricating oil in both vertical and horizontal states, which can prevent the high-speed motor rotor 1 from contacting the lubricating oil, thereby avoiding large oil stirring losses, improving the transmission efficiency of the drive device, and improving the power-to-weight ratio of the drive device.

[0040] The radiator assembly 20 is fixed to the main housing 24 by screws and is arranged below the entire drive device, away from the center of the rotor, and uses the downward airflow of the rotor to dissipate heat, thereby improving the heat dissipation efficiency of the radiator.

[0041] The oil pump driving gear 6 and the oil pump input gear 7 form a cylindrical gear pair, which increases the speed of the oil pump 8. This configuration can arbitrarily adjust the speed increase ratio of the cylindrical gear pair to adapt to the rotational speed of the oil pump and meet the lubrication and heat dissipation requirements of the entire drive device. At the same time, this configuration reduces the outer dimensions of the driven device and reduces its weight.

[0042] A deep groove ball bearing 15 is disposed between the motor rotor 1 and the rotor shaft 17 for rotationally supporting the motor rotor 1. This configuration simplifies the support structure of the motor rotor 1, reduces the weight of the drive device, and improves the power-to-weight ratio of the drive device.

[0043] In order to ensure the load balance of the NW type planetary gear train in the reduction system, the sun gear 3 is connected to the motor rotor 1 through the spline 26 .

[0044] A high-speed motor is selected, and a reduction system 21 is added to the motor output end to reduce the motor speed and increase the motor torque to meet the speed and power requirements of the eVTOL rotor.

Claims

1. A low-speed, high-power-to-weight ratio drive device suitable for new energy, characterized in that: include: A mounting structure (18), a controller (19), a radiator assembly (20), a reduction system (21), a motor assembly (22), a rotor shaft assembly (23), and a main engine box (24), wherein: The motor assembly (22) is arranged above the reduction system (21). The motor assembly (22) transmits the high speed of the motor to the rotor shaft assembly (23) through the reduction system (21). The rotor shaft assembly (23) outputs the low speed to drive the rotor system. The lubricating oil pool (32) is located on the right side of the main engine box (24). When the entire drive device is in a vertical state, the motor assembly (22) is located at the top of the drive device and the lubricating oil is located at the bottom. When the entire drive device tilts to the right and turns to a horizontal state, the lubricating oil flows into the lubricating oil pool (32). The motor assembly (22) is away from the lubricating oil in both states, so as to prevent the high speed from being damaged. The high-speed motor rotor (1) contacts the lubricating oil, thereby avoiding a large oil stirring loss, improving the transmission efficiency of the drive device, and improving the power-to-weight ratio of the drive device; the main engine case (24) envelops the motor assembly (22) and the reduction system (21), the main engine case (24) and the controller (19) are fixed by a screw pile assembly, the radiator assembly (20) is fixed to the main engine case (24), and is arranged below the entire drive device, away from the center of the rotor, and uses the lower airflow of the rotor to dissipate heat, thereby improving the heat dissipation efficiency of the radiator; the mounting structure (18) is fixed to the main engine case (24) by screws, and is used to be connected to the tilt mechanism.

2. The low-speed and high-power-to-weight ratio driving device applicable to new energy sources according to claim 1 is characterized in that: The reduction system (21) is composed of a sun gear (3), a first planetary gear (4), a second planetary gear (10) and an inner gear ring (9) to form a NW planetary reduction system.

3. The low-speed and high-power-to-weight ratio driving device applicable to new energy sources according to claim 2 is characterized in that: The first planetary gear (4) and the second planetary gear (10) form a double planetary gear shaft, which is supported by a first cylindrical roller bearing (12) and a second cylindrical roller bearing (14); the inner gear ring (9) is fixed to the main housing (24) through a screw assembly; and the sun gear (3) is connected to the motor rotor (1) through a spline (26).

4. The low-speed and high-power-to-weight ratio driving device applicable to new energy sources according to claim 3 is characterized in that: The planetary carrier assembly (5) in the reduction system (21) is composed of an upper planetary carrier (27) and a lower planetary carrier (28); the lubricating oil pump driving gear (6) of the reduction system (21) is arranged between the upper planetary carrier (27) and the lower planetary carrier (28); the lubricating oil pump driving gear (6), the upper planetary carrier (27) and the lower planetary carrier (28) are fixed by a bolt assembly; the outer ring of the second cylindrical roller bearing (14) is mounted on the upper planetary carrier (27), and the first cylindrical roller bearing (12) is mounted on the lower planetary carrier (28).

5. The low-speed and high-power-to-weight ratio driving device applicable to new energy sources according to claim 4 is characterized in that: The lubricating oil pump driving gear (6) and the lubricating oil pump input gear (7) form a cylindrical gear pair, which increases the speed of the driving lubricating oil pump (8). The input end of the lubricating oil pump (8) is connected to the lubricating oil pump input gear (7), and the lubricating oil pump input gear (7) is supported by a double-row angular contact ball bearing (25).

6. The low-speed and high-power-to-weight ratio driving device applicable to new energy sources according to claim 1 is characterized in that: The lubricating oil pump input gear (7) and the lubricating oil pump (8) are arranged below the lubricating oil pool (32).

7. The low-speed and high-power-to-weight ratio driving device applicable to new energy sources according to claim 1 is characterized in that: The rotor shaft assembly (23) is composed of a rotor shaft (17), a first angular contact ball bearing (13), a deep groove ball bearing (15), a second angular contact ball bearing (16), a bearing bushing (29), a first locking nut (30) and a second locking nut (31). The rotor shaft (17) is supported by the first angular contact ball bearing (13) and the second angular contact ball bearing (16). The first locking nut (30) fixes the second angular contact ball bearing (16), and the second locking nut (31) fixes the first angular contact ball bearing (13). The deep groove ball bearing (15) is arranged between the motor rotor (1) and the rotor shaft (17) for rotational support of the motor rotor (1). The bearing bushing (29) is arranged between the inner ring of the deep groove ball bearing (15) and the inner ring of the second angular contact ball bearing (16) for axial positioning of the deep groove ball bearing (15). This configuration simplifies the support structure of the motor rotor (1), reduces the weight of the drive device, and improves the power-to-weight ratio of the drive device.

8. The low-speed and high-power-to-weight ratio driving device applicable to new energy sources according to claim 1 is characterized in that: The heat sink assembly (20) is fixed on the main housing (24) by screws.

Images