Motor and speed reducer integrated structure

Abstract

The invention belongs to the technical field of helicopter motor reducer integrated design, and particularly relates to a motor coaxial reducer integrated structure. Comprising a motor, a coaxial speed reducer, a motor controller, a lubricating oil pump, a radiator and a bolt assembly, the coaxial speed reducer drives an upper rotor shaft and a lower rotor shaft to coaxially rotate reversely at a constant speed through a one-to-two bevel gear, and the coaxial speed reducer is supported by a main case and a lower case; the upper bevel gear wheel, the lower bevel gear wheel and the tapered roller bearing are compressed and fixed on the upper rotor shaft and the lower rotor shaft through a locking nut and a lock washer; the main case input side flange is connected with the motor shell through a bolt and nut assembly and provides support for the motor stator and the shell, and the bearing supporting cover plate is connected with the motor shell through the bolt and nut assembly. The lubricating oil pump supplies oil to the speed reducer, the motor stator winding and the motor controller for lubrication and heat dissipation; a lubricating oil pool is arranged at the bottom of the lower casing; the motor controller is attached to the bearing supporting end cover on the right side of the motor in the circumferential direction, and the radiator is attached to the motor controller.

Description

Technical Field

[0001] The invention belongs to the technical field of integrated design of helicopter motor reducers, and in particular relates to an integrated structure of a motor coaxial reducer. Background Art

[0002] With the rapid development of eVTOL (electric vertical take-off and landing vehicle), the integration of rotor electric drive assembly is getting higher and higher. The rotor electric drive assembly is one of the most important moving parts of eVTOL. It is a highly integrated product integrating motor, controller, reducer, lubrication and heat dissipation. Its system is complex, with large power transmission and high integration. The quality of its performance is often related to the success or failure of the development of the whole machine. Whether its life, weight, reliability and other indicators can be achieved has a significant impact on the development and use of the whole machine. The difficulty of the development of the rotor electric drive assembly requires comprehensive consideration of the rotor aerodynamic efficiency and the overall dimensions of the aircraft. Therefore, it is necessary to design a motor coaxial reducer integrated structure to improve the weight-to-weight ratio and transmission efficiency of the eVTOL rotor electric drive assembly, reduce the overall dimensions and improve the rotor aerodynamic efficiency. Summary of the invention

[0003] Purpose of the invention: To provide an integrated motor-coaxial reducer structure to improve the power-to-weight ratio and transmission efficiency of the eVTOL rotor electric drive.

[0004] Technical solution:

[0005] A motor coaxial reducer integrated structure includes: a motor, a coaxial reducer, a motor controller, a lubricating oil pump, a radiator and a bolt assembly, wherein:

[0006] The motor consists of a motor housing, a motor stator and winding, and a motor rotor; the coaxial reducer is driven by a one-to-two bevel gear to drive the upper rotor shaft and the lower rotor shaft to rotate coaxially at the same speed, and the coaxial reducer is supported by the main casing and the lower casing; the input gear shaft of the coaxial reducer is supported by a pair of angular contact ball bearings and a deep groove ball bearing on the main casing and the bearing support cover plate respectively; the motor rotor is connected to the reducer input gear shaft through a spline, and the torque and speed of the motor rotor are transmitted to the input gear shaft, the resolver of the motor controller is mounted on the input gear shaft, the resolver participates in the control of the motor, the locking nut fastens the motor stator to the input gear shaft, and the motor stator is integrated into the input gear shaft; the upper rotor shaft and the lower rotor shaft are supported by a pair of tapered roller bearings respectively, and the upper large bevel gear and the lower large bevel gear are respectively splined It is installed on the upper rotor shaft and the lower rotor shaft, and the upper large bevel gear and the lower large bevel gear are pressed and fixed to the upper rotor shaft and the lower rotor shaft with the tapered roller bearing through the locking nut and the locking washer; the input side flange of the main casing is connected to the motor housing through a bolt and nut assembly to provide support for the motor stator and the housing, and the bearing support cover is connected to the motor housing through the bolt and nut assembly; a large cylindrical gear and a small cylindrical gear are arranged at the bottom of the reducer, wherein the large cylindrical gear is fixed to the lower large bevel gear by screws, and the small cylindrical gear is supported by a double-row angular contact ball bearing; the lubricating oil pump supplies oil to the reducer, the motor stator winding and the motor controller for lubrication and heat dissipation; a lubricating oil pool is arranged at the bottom of the lower casing; the motor controller is circumferentially attached to the bearing support end cover on the right side of the motor, and the radiator is attached to the motor controller.

[0007] Furthermore, the motor controller and the radiator are arranged at the rightmost end, away from the center of the rotor.

[0008] Furthermore, the angular contact ball bearing is oil lubricated and the deep groove ball bearing is grease lubricated.

[0009] Furthermore, a lip-shaped oil seal is provided on the input gear shaft of the coaxial reducer to seal the lubricating oil in the reducer input shaft and prevent the lubricating oil in the reducer from flowing into the motor rotor.

[0010] Furthermore, rubber plugs are provided at the ends of the upper rotor shaft and the lower rotor shaft for sealing.

[0011] Furthermore, the reducer main housing is designed with side plates, which are connected to the machine body structure crossbeams through bolt and nut assemblies.

[0012] Furthermore, the coaxial reducer is driven by a one-to-two bevel gear to drive the upper rotor shaft and the lower rotor shaft to rotate coaxially at the same speed, specifically:

[0013] A small bevel gear is arranged on the input gear shaft of the coaxial reducer, and the upper large bevel gear and the lower large bevel gear are driven simultaneously by the small bevel gear.

[0014] Furthermore, the upper rotor shaft and the lower rotor shaft are connected to the rotor system through flanges to drive the upper rotor and the lower rotor to coaxially reverse.

[0015] Beneficial effects:

[0016] The motor coaxial reducer integrated structure of the present invention improves the power-to-weight ratio and transmission efficiency of the eVTOL rotor electric drive. The structure is streamlined, lightweight, safe and reliable. The present invention is suitable for the eVTOL rotor electric drive assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of an integrated structure of a motor coaxial reducer according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Axial cross-sectional view of

[0019] Figure 3 The figure is a simplified transmission configuration diagram of a motor coaxial reducer integrated structure according to an embodiment of the present invention.

[0020] Among them, the small bevel gear 1, the bearing cover plate 2, the lip seal 3, the motor housing 4, the motor stator and winding 5, the controller mounting plate 6, the motor rotor 7, the bearing support end cover 8, the resolver 9, the locking nut 10, the input gear shaft 11, the radiator 12, the motor controller 13, the deep groove ball bearing 14, the angular contact ball bearing 15, the double row angular contact ball bearing 16, the small cylindrical gear 17, the lubricating oil pool 18, the lubricating oil pump 19, the lower lip oil seal 20, the lower casing 21, the tapered roller bearing 22, the large cylindrical gear 23, the lower large bevel gear 24, the rubber plug 25, the stop washer 26, the upper large bevel gear 27, the main casing 28, the upper lip oil seal 29, the motor 30, the upper rotor shaft 31, the bolt and nut assembly 32, the lower rotor shaft 33, the coaxial reducer 34, the bolt and nut assembly 35, the bevel gear pair 36, and the cylindrical gear pair 37. DETAILED DESCRIPTION

[0021] like Figure 1-3A motor coaxial reducer integrated structure includes a motor 30, a coaxial reducer 34, a motor controller 13, a radiator 12 and a bolt assembly 32. The motor 30 is composed of a motor housing 4, a motor stator and winding 5 and a motor rotor 7; the coaxial reducer 34 is driven by a one-to-two bevel gear pair 36 to drive the upper rotor shaft 31 and the lower rotor shaft 33 to rotate coaxially at the same speed, and the coaxial reducer 34 is supported by the main casing 28 and the lower casing 21; the lower lip oil seal 20 and the upper lip oil seal 29 are used for the lubricating oil sealing of the coaxial reducer 34.The input gear shaft 11 is supported by a pair of angular contact ball bearings 15 and a deep groove ball bearing 14. The pair of angular contact ball bearings 15 are oil-lubricated, and the deep groove ball bearings 14 are grease-lubricated. A lip seal 3 is designed to block the lubricating oil in the reducer to prevent the lubricating oil in the reducer from flowing into the motor rotor 7. At the same time, the motor rotor 7 is connected to the input gear shaft 11 through a spline. The torque and speed of the motor rotor 7 are transmitted to the input gear shaft 11. The resolver 9 is mounted on the input gear shaft 11. The resolver 9 participates in the control of the motor 30. The locking nut 10 tightens the input gear shaft 11. The motor rotor 7 is integrated into the input gear shaft 11, which will improve the power-to-weight ratio and transmission efficiency of the electric drive assembly; the upper rotor shaft 31, The lower rotor shaft 33 is supported by a pair of tapered roller bearings 22, and the upper large bevel gear 27 and the lower large bevel gear 24 are respectively installed on the upper rotor shaft 31 and the lower rotor shaft 33 through splines. The bevel gear and the bearing are pressed and fixed on the rotor shaft through the locking nut and the stop washer 26. The rubber plug 25 is designed to be installed in the holes of the upper rotor shaft 31 and the lower rotor shaft 33 for sealing. The upper rotor shaft 31 and the lower rotor shaft 33 are connected to the rotor system through flanges to drive the upper rotor and the lower rotor to reverse coaxially. This coaxial reducer has a simple and compact configuration, reduces the number of moving parts, and improves the power-to-weight ratio and transmission efficiency of the eVTOL rotor electric drive assembly; the main casing 28 is designed with a side plate, which is connected to the machine through a bolt and nut assembly 35 The main structure crossbeam is connected, and the input side flange of the main engine box 28 is connected to the motor housing 4 through a bolt and nut assembly 32 to provide support for the motor stator and winding 5 and the motor housing. The bearing support cover plate 8 supports the deep groove ball bearing 14 and is connected to the motor housing 4 through a bolt and nut assembly 32. This installation configuration is simple and compact, which further improves the power-to-weight ratio of the eVTOL rotor electric drive assembly; a pair of cylindrical gear pairs 37 speed increasers are designed at the bottom of the reducer to drive the lubricating oil pump 19 to supply oil to the entire electric drive assembly, and lubricate and dissipate heat for the coaxial reducer 34, the motor stator and winding 5 and the motor controller 13, wherein the large cylindrical gear 23 is fixed to the lower large bevel gear 24 by screws, and the small cylindrical gear 17 is connected by a double-row angle joint The ball bearing 16 supports and increases the speed to drive the lubricating oil pump 19. A lubricating oil pool 18 is designed at the bottom of the lower casing 21. The speed increase of the cylindrical gear pair 27 can adapt to the lubricating oil pump 19 by adjusting the transmission ratio to meet the lubrication and heat dissipation requirements of the power assembly; the motor controller 13 is circumferentially attached to the bearing support end cover 8 and the controller mounting plate 6 on the right side of the motor 30, and the radiator 12 is attached to the motor controller 13. The motor controller 13 and the radiator 12 are designed at the rightmost end of the power assembly, away from the center of the rotor, and the strong downward airflow of the rotor is used for blowing and heat dissipation, thereby improving the efficiency of the radiator 12, reducing the size of the radiator 12, and reducing the overall dimensions of the entire power assembly, thereby reducing the aerodynamic interference of the rotor and improving the aerodynamic efficiency of the rotor.

[0022] This device integrates the motor stator and winding 5 into the input gear shaft 11, which will improve the power-to-weight ratio and transmission efficiency of the electric drive assembly; the coaxial reducer 34 is driven by a one-to-two bevel gear to drive the upper rotor shaft 31 and the lower rotor shaft 33 to rotate coaxially at the same speed. The coaxial reducer 34 is supported by the main casing 28 and the lower casing 21, including: the input gear shaft 11 is supported by a pair of angular contact ball bearings 15 and a deep groove ball bearing 14, and the upper rotor shaft 31 and the lower rotor shaft 33 are supported by a pair of tapered roller bearings 22 respectively. This coaxial reducer has a compact configuration, reduces the number of moving parts, and improves the power-to-weight ratio and transmission efficiency of the eVTOL rotor electric drive assembly; the main casing 28 is designed with a side plate, which is connected to the main casing 28 through a bolt and nut assembly 35 The fuselage structure is connected by a crossbeam, and the input side flange of the main casing 28 is connected to the motor housing 4 through a bolt and nut assembly 32. This installation configuration is simple and compact, which further improves the power-to-weight ratio of the eVTOL rotor electric drive assembly; a pair of cylindrical gear pairs 27 are designed at the bottom of the coaxial reducer 34 to increase the speed. The cylindrical gear pair speed increase can be adjusted to adapt to the lubricating oil pump 19 to meet the lubrication and heat dissipation requirements of the electric assembly by adjusting the transmission ratio; the motor controller 13 and the radiator 12 are designed at the rightmost end of the electric assembly, away from the center of the rotor, and the strong downflow of the rotor is used for blowing and heat dissipation, thereby improving the efficiency of the radiator 12, reducing the size of the radiator 12, and reducing the overall size of the entire power assembly, thereby reducing the rotor aerodynamic interference and improving the rotor aerodynamic efficiency. Its structure is simple, compact and practical, with high transmission efficiency and high power-to-weight ratio. The present invention is suitable for the eVTOL rotor electric drive assembly.

[0023] The key points of the present invention are:

[0024] 1) Integrating the motor stator and winding 5 onto the input gear shaft 11 will improve the power-to-weight ratio and transmission efficiency of the electric drive assembly;

[0025] 2) The input gear shaft 11 is supported by a pair of angular contact ball bearings 15 and a deep groove ball bearing 14. The angular contact ball bearings are oil lubricated, and the deep groove ball bearings 14 are grease lubricated. A lip seal 3 is designed to seal the lubricating oil in the reducer to prevent the lubricating oil in the reducer from flowing into the motor rotor 7;

[0026] 3) The coaxial reducer 34 is driven by a one-to-two bevel gear to drive the upper rotor shaft 31 and the lower rotor shaft 33 to rotate coaxially at the same speed. The coaxial reducer 34 is supported by the main casing 28 and the lower casing 21, including that the input gear shaft 11 is supported by a pair of angular contact ball bearings 15 and a deep groove ball bearing 14, and the upper rotor shaft 31 and the lower rotor shaft 33 are supported by a pair of tapered roller bearings 22 respectively. This coaxial reducer has a compact configuration, reduces the number of moving parts, and improves the power-to-weight ratio and transmission efficiency of the eVTOL rotor electric drive assembly;

[0027] 4) The main box 28 is designed with side panels, which are connected to the fuselage structure beams through bolt and nut assemblies 35; this installation configuration is streamlined and compact, further improving the power-to-weight ratio of the eVTOL rotor electric drive assembly;

[0028] 5) The input side flange of the main engine box 28 is connected to the motor housing 4 through a bolt and nut assembly 32. This installation configuration is simple and compact, further improving the power-to-weight ratio of the eVTOL rotor electric drive assembly;

[0029] 6) A pair of cylindrical gear pairs 37 are designed at the bottom of the coaxial reducer 34 to increase the speed. The cylindrical gear pair 37 is designed to increase the speed so that the lubricating oil pump 19 can meet the lubrication and heat dissipation requirements of the power assembly by adjusting the transmission ratio;

[0030] 7) The large cylindrical gear 23 is fixed to the lower large bevel gear 24 by screws, and the small cylindrical gear 17 is supported by a double-row angular contact ball bearing 16, which increases the speed and drives the lubricating oil pump 19;

[0031] 8) A lubricating oil pool 18 is designed below the lubricating oil pump 19 at the bottom of the lower casing 21 to store lubricating oil for lubrication and heat dissipation of the coaxial reducer 34 and the motor 30;

[0032] 9) The motor controller 13 and the radiator 12 are designed at the rightmost end of the power assembly, away from the center of the rotor, and the strong downflow of the rotor is used to blow air and dissipate heat, thereby improving the efficiency of the radiator 12, reducing the size of the radiator 12, and reducing the overall size of the entire power assembly, thereby reducing the rotor aerodynamic interference and improving the rotor aerodynamic efficiency;

[0033] 10) The present invention is applicable to an eVTOL rotor electric drive assembly.

Claims

1. A motor coaxial reducer integrated structure, characterized in that: include: Motor, coaxial reducer, motor controller, lubricating oil pump, radiator and bolt assembly, wherein: The motor consists of a motor housing, a motor stator and winding, and a motor rotor; the coaxial reducer is driven by a one-to-two bevel gear to drive the upper rotor shaft and the lower rotor shaft to rotate coaxially at the same speed, and the coaxial reducer is supported by the main casing and the lower casing; the input gear shaft of the coaxial reducer is supported by a pair of angular contact ball bearings and a deep groove ball bearing on the main casing and the bearing support cover plate respectively; the motor rotor is connected to the reducer input gear shaft through a spline, and the torque and speed of the motor rotor are transmitted to the input gear shaft, the resolver of the motor controller is mounted on the input gear shaft, the resolver participates in the control of the motor, the locking nut fastens the motor stator to the input gear shaft, and the motor stator is integrated into the input gear shaft; the upper rotor shaft and the lower rotor shaft are supported by a pair of tapered roller bearings respectively, and the upper large bevel gear and the lower large bevel gear are respectively splined It is installed on the upper rotor shaft and the lower rotor shaft, and the upper large bevel gear and the lower large bevel gear are pressed and fixed to the upper rotor shaft and the lower rotor shaft with the tapered roller bearing through the locking nut and the locking washer; the input side flange of the main casing is connected to the motor housing through a bolt and nut assembly to provide support for the motor stator and the housing, and the bearing support cover is connected to the motor housing through the bolt and nut assembly; a large cylindrical gear and a small cylindrical gear are arranged at the bottom of the reducer, wherein the large cylindrical gear is fixed to the lower large bevel gear by screws, and the small cylindrical gear is supported by a double-row angular contact ball bearing; the lubricating oil pump supplies oil to the reducer, the motor stator winding and the motor controller for lubrication and heat dissipation; a lubricating oil pool is arranged at the bottom of the lower casing; the motor controller is circumferentially attached to the bearing support end cover on the right side of the motor, and the radiator is attached to the motor controller.

2. The motor coaxial reducer integrated structure according to claim 1 is characterized in that: The motor controller and heat sink are located at the far right, away from the center of the rotor.

3. The motor coaxial reducer integrated structure according to claim 1 is characterized in that: Angular contact ball bearings are oil lubricated, and deep groove ball bearings are grease lubricated.

4. The motor coaxial reducer integrated structure according to claim 1, characterized in that: A lip-shaped oil seal is provided on the input gear shaft of the coaxial reducer to seal the lubricating oil in the reducer input shaft and prevent the lubricating oil in the reducer from flowing into the motor rotor.

5. The motor coaxial reducer integrated structure according to claim 1 is characterized in that: Rubber plugs are provided at the ends of the upper rotor shaft and the lower rotor shaft for sealing.

6. The motor coaxial reducer integrated structure according to claim 1, characterized in that: The reducer main housing is designed with side panels, which are connected to the machine body structure crossbeams through bolt and nut assemblies.

7. The motor coaxial reducer integrated structure according to claim 1, characterized in that: The coaxial reducer is driven by a one-to-two bevel gear to drive the upper rotor shaft and the lower rotor shaft to rotate coaxially at the same speed. Specifically: A small bevel gear is arranged on the input gear shaft of the coaxial reducer, and the upper large bevel gear and the lower large bevel gear are driven simultaneously by the small bevel gear.

8. The motor coaxial reducer integrated structure according to claim 1, characterized in that: The upper rotor shaft and the lower rotor shaft are connected to the rotor system through flanges to drive the upper rotor and the lower rotor to coaxially reverse.

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