Motor assembly and flight vehicle

Abstract

The invention discloses a motor assembly and a flight vehicle, and relates to the technical field of motors, the motor assembly comprises a stator structure and an outer rotor structure; the stator structure is provided with a supporting shaft part, and the stator structure is used for being installed on an arm of a flight vehicle; the outer rotor structure is provided with a connecting through hole, and the connecting through hole is in running fit with the supporting shaft part; the outer rotor structure is used for mounting the rotor blade, and the outer rotor structure is used for rotating relative to the stator structure under the acting force of a magnetic field so as to drive the rotor blade to rotate relative to the machine arm. According to the technical scheme, an inner rotor motor used for driving the rotor blades to rotate is replaced with the outer rotor motor, a speed reducer and matched devices thereof can be omitted, and the rotor blades are driven in a direct drive mode, so that the motor structure is simplified, the number of parts is reduced, and the motor assembly is more compact in structure and lighter in weight; therefore, the overall weight of the flight vehicle is reduced, and the assembly and subsequent maintenance of the flight vehicle are more convenient.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor assembly and a flying vehicle. Background Art

[0002] With the development of transportation technology, flying vehicles such as flying cars have appeared one after another. The promotion and use of flying vehicles will help solve the problem of traffic congestion and ease the pressure of urban traffic.

[0003] The rotor blades are the core components of flying vehicles. When the rotor blades rotate, the shape and movement of the rotor blades cause differences in air pressure on the upper and lower surfaces of the rotor blades. According to Bernoulli's principle, the pressure is lower where the flow rate is fast, and the pressure is higher where the flow rate is slow. Therefore, the high-pressure air under the rotor blades will push the rotor blades upward, thereby providing lift for the flying vehicle to take off and hover in the air.

[0004] At present, the motors used to drive the rotor blades to rotate generally use inner rotor motors, which have the advantage of fast speed, but small torque, and need to be used with a reducer to better overcome resistance and realize the rotation of the rotor blades in different use environments. The addition of a reducer and its supporting components will lead to a significant increase in the number of parts, making the motor structure more complex and increasing the overall weight of the flying vehicle, which has an adverse impact on the assembly, maintenance and lightweight development of flying vehicles. Summary of the invention

[0005] The main purpose of this application is to propose a motor assembly, which aims to replace the inner rotor motor used to drive the rotation of the rotor blades with an outer rotor motor, eliminate the reducer and its supporting components, and realize the driving of the rotor blades in a direct drive form, making the motor structure simpler, more compact and lighter.

[0006] To achieve the above-mentioned purpose, the motor assembly proposed in the present application is applied to a flying vehicle, and the motor assembly includes:

[0007] A stator structure having a supporting shaft; the stator structure is used to be mounted on the arm of the flying vehicle;

[0008] The outer rotor structure has a connecting through hole, and the connecting through hole is rotatably matched with the supporting shaft; the outer rotor structure is used to install the rotor blades, and the outer rotor structure is used to rotate relative to the stator structure under the action of the magnetic field to drive the rotor blades to rotate relative to the machine arm.

[0009] Optionally, the motor assembly further comprises a connecting bearing, an inner ring of the connecting bearing is sleeved on the supporting shaft portion, and an outer ring of the connecting bearing is fixedly fitted in the connecting through hole; the connecting bearing is a grease-lubricated bearing.

[0010] Optionally, the connecting bearing includes a first bearing and a second bearing, the inner ring of the first bearing is sleeved on the lower side of the support shaft portion, the inner ring of the second bearing is sleeved on the upper side of the support shaft portion, and the outer ring of the first bearing and the outer ring of the second bearing are fixedly fitted in the connecting through hole.

[0011] Optionally, the motor assembly further comprises a limiting ring and a pressure cover, wherein the limiting ring is sleeved on the supporting shaft portion, and the pressure cover is connected to the upper end portion of the supporting shaft portion; the lower side of the supporting shaft portion has a shaft shoulder portion, and the hole wall of the connecting through hole is convexly provided with a first flange portion arranged around the circumference;

[0012] The lower end face of the inner ring of the first bearing abuts against the upper end face of the shoulder portion, the upper end face of the inner ring of the first bearing abuts against the lower end face of the limiting ring, and the upper end face of the outer ring of the first bearing abuts against the lower end face of the first flange portion; the lower end face of the inner ring of the second bearing abuts against the upper end face of the limiting ring, the upper end face of the inner ring of the second bearing abuts against the pressure cover, and the lower end face of the outer ring of the second bearing abuts against the upper end face of the first flange portion.

[0013] Optionally, a locking hole is provided on the upper end surface of the support shaft, in which a wire thread sleeve is embedded; the pressure cover has a shaft body and a flange cover body, the upper end of the shaft body is connected to the lower end surface of the flange cover body, the shaft body is provided with an external thread, and the shaft body is screwed into the wire thread sleeve through the external thread; the upper end surface of the inner ring of the second bearing abuts against the lower end surface of the flange cover body.

[0014] Optionally, the motor assembly also includes an adjustment gasket, which is sleeved on the support shaft portion; the adjustment gasket is clamped between the upper end surface of the first bearing and the lower end surface of the limit ring, and / or the adjustment gasket is clamped between the lower end surface of the second bearing and the upper end surface of the limit ring.

[0015] Optionally, the motor assembly also includes a first sealing cover and a first annular seal, the first sealing cover covers the lower end surface of the first bearing, the outer periphery of the first annular seal is fixed on the first flange portion, the inner periphery of the first annular seal dynamically seals with the outer cylindrical surface of the limiting ring, and the first annular seal, the hole wall of the connecting through hole, the outer cylindrical surface of the limiting ring, and the first sealing cover enclose a first sealed space.

[0016] Optionally, the motor assembly also includes a second sealing cover and a second annular seal, the second sealing cover covers the upper end surface of the second bearing, the outer periphery of the second annular seal is fixed on the first flange portion, the inner periphery of the second annular seal dynamically seals with the outer cylindrical surface of the limiting ring, and the second annular seal, the hole wall of the connecting through hole, the outer cylindrical surface of the limiting ring, and the second sealing cover enclose a second sealed space.

[0017] Optionally, the inner cylindrical surface of the first flange portion is convexly provided with a second flange portion which is arranged circumferentially;

[0018] The motor assembly includes a first hole elastic circlip, which is clamped on the first flange; the upper end of the first annular seal abuts against the lower end surface of the second flange, and the lower end of the first annular seal abuts against the upper end surface of the first hole elastic circlip;

[0019] And / or, the motor assembly includes an elastic retaining ring for a second hole, which is clamped on the first flange portion; the lower end of the second annular seal abuts against the upper end surface of the second flange portion, and the upper end of the second annular seal abuts against the lower end surface of the second hole elastic retaining ring.

[0020] Optionally, the outer cylindrical surface of the limiting ring is convexly provided with a third flange portion circumferentially arranged, the surface of the third flange portion is hardened and ground to form a first hardened layer, and the inner circumference of the first annular seal is dynamically sealed with the first hardened layer.

[0021] Optionally, the outer cylindrical surface of the limiting ring is convexly provided with a fourth flange portion circumferentially arranged, the surface of the fourth flange portion is hardened and ground to form a second hardened layer, and the inner circumference of the second annular seal is dynamically sealed with the second hardened layer.

[0022] Optionally, the motor assembly also includes a mechanical oil pump, which is installed on the stator structure, and the oil pump rotor of the mechanical oil pump is transmission connected to the outer rotor structure; when the outer rotor structure rotates relative to the stator structure under the action of the magnetic field, the outer rotor structure is used to drive the oil pump rotor to rotate.

[0023] Optionally, a first gear is sleeved on the outer rotor structure, a second gear is sleeved on the oil pump rotor, and the second gear is meshed with the first gear.

[0024] Optionally, the second gear includes a gear tooth portion and an annular wheel core portion, the inner periphery of the annular wheel core portion is snap-fitted with the rotating shaft portion of the oil pump rotor, the outer periphery of the annular wheel core portion is embedded in the center of the gear tooth portion, and the gear tooth portion is meshed with the first gear for transmission; the gear tooth portion is made of self-lubricating plastic material, and the annular wheel core portion is made of metal material.

[0025] Optionally, the annular wheel core portion is provided with a plurality of fin structures protruding radially outward, and the plurality of fin structures are arranged at intervals along the circumferential direction to form an eddy current rotor; the motor assembly also includes an eddy current stator, which is mounted on the stator structure and arranged opposite to the eddy current rotor; the eddy current rotor is used to rotate relative to the eddy current stator under the meshing action of the first gear and the gear tooth portion to generate eddy currents.

[0026] Optionally, the motor assembly further comprises a sealing end cover, which is sealingly connected to the upper end of the outer rotor structure, and the sealing end cover is located above the supporting shaft portion and forms a cover for the supporting shaft portion.

[0027] Optionally, a containing chamber is provided inside the stator structure, and the motor assembly further includes a motor controller, which is disposed in the containing chamber and is electrically connected to a winding portion of the stator structure.

[0028] The present application also proposes a flying vehicle, the flying vehicle comprising a machine arm, a rotor blade, and a motor assembly as described above;

[0029] The stator structure of the motor assembly is mounted on the machine arm, and the rotor blades are mounted on the outer rotor structure of the motor assembly; the outer rotor structure is used to rotate relative to the stator structure under the force of the magnetic field to drive the rotor blades to rotate relative to the machine arm.

[0030] In the technical solution of the present application, the stator structure is installed on the arm of the flying vehicle, and the outer rotor structure on which the rotor blades are installed rotates and cooperates with the support shaft of the stator structure. The rotation of the outer rotor structure relative to the stator structure under the action of the magnetic field can drive the rotor blades to rotate relative to the arm to provide lift for the flying vehicle. Since the outer rotor drive structure can obtain a larger torque than the existing inner rotor drive structure, based on the technical solution of this embodiment, the reducer and its supporting components can be eliminated, and the drive of the rotor blades can be realized in the form of direct drive of the outer rotor, thereby simplifying the motor structure, reducing the number of parts, making the motor assembly structure more compact and lighter, thereby reducing the overall weight of the flying vehicle, making it easier to assemble and subsequently maintain the flying vehicle, and providing a favorable foundation for the lightweight development of the flying vehicle. In addition, since the support shaft is directly integrated on the stator structure, and the support shaft can provide cantilever support for the outer rotor structure, that is, there is no need to set a rotating shaft on the outer rotor structure, the design of the outer rotor structure can be simplified, making the overall structure of the motor assembly more concise and compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a motor assembly provided in the present application;

[0033] Figure 2 A schematic cross-sectional structure diagram of an embodiment of a motor assembly provided in the present application;

[0034] Figure 3 A schematic diagram of the three-dimensional structure of the second gear in an embodiment of the motor assembly provided in the present application;

[0035] Figure 4 An induced current curve formed when an eddy current rotor rotates relative to an eddy current stator in an embodiment of a motor assembly provided by the present application;

[0036] Figure 5 A schematic diagram of the three-dimensional structure of an embodiment of a flying vehicle provided in the present application.

[0037] Description of Figure Numbers:

[0038] 100, motor assembly; 200, main body; 300, machine arm; 400, rotor blade;

[0039] 1. stator structure; 101. supporting shaft; 102. containing chamber; 1011. shaft shoulder;

[0040] 2. outer rotor structure; 201. connecting through hole; 2011. first flange portion; 20111. second flange portion;

[0041] 3. Connecting bearing; 301. First bearing; 302. Second bearing;

[0042] 4. a limiting ring; 401. a third flange portion; 402. a fourth flange portion;

[0043] 5. gland; 501. shaft body; 502. flange cover body;

[0044] 6. Wire thread sleeve; 7. Adjusting gasket; 8. First sealing cover;

[0045] 9. first annular sealing member; 901. first sealed space;

[0046] 10. Second sealing cover;

[0047] 11. second annular sealing member; 1101. second sealed space;

[0048] 12. Use elastic circlip for the first hole; 13. Use elastic circlip for the second hole;

[0049] 14. Mechanical oil pump; 1401. Oil pump rotor;

[0050] 15. First gear;

[0051] 16. second gear; 1601. gear tooth portion; 1602. annular gear core portion; 16021. flat torque transmission portion; 16022. fin structure;

[0052] 17. Eddy current stator; 18. Sealing end cover; 19. Motor controller.

[0053] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0057] The rotor blades are the core components of flying vehicles. When the rotor blades rotate, the shape and movement of the rotor blades cause differences in air pressure on the upper and lower surfaces of the rotor blades. According to Bernoulli's principle, the pressure is lower where the flow rate is fast, and the pressure is higher where the flow rate is slow. Therefore, the high-pressure air under the rotor blades will push the rotor blades upward, thereby providing lift for the flying vehicle to take off and hover in the air.

[0058] At present, the motors used to drive the rotor blades to rotate generally use inner rotor motors, which have the advantage of fast speed, but small torque, and need to be used with a reducer to better overcome resistance and realize the rotation of the rotor blades in different use environments. The addition of reducers and related devices will lead to a significant increase in the number of parts, making the motor structure more complex and increasing the overall weight of the flying vehicle, which has an adverse impact on the assembly, maintenance and lightweight development of flying vehicles.

[0059] In order to solve the above problems, the present application proposes a motor assembly, which aims to replace the inner rotor motor used to drive the rotor blades to rotate with an outer rotor motor, eliminate the reducer and its related components, and realize the driving of the rotor blades in a direct drive form, making the motor structure simpler, more compact and lighter.

[0060] See also Figure 1 , Figure 2 and Figure 5The motor assembly 100 proposed in the present application is applied to a flying vehicle, and the motor assembly 100 includes:

[0061] The stator structure 1 has a supporting shaft portion 101; the stator structure 1 is used to be installed on an arm 300 of a flying vehicle;

[0062] The outer rotor structure 2 has a connecting through hole 201, which is rotatably matched with the support shaft 101; the outer rotor structure 2 is used to install the rotor blades 400, and the outer rotor structure 2 is used to rotate relative to the stator structure 1 under the action of the magnetic field to drive the rotor blades 400 to rotate relative to the machine arm 300.

[0063] In this embodiment, the flying vehicle includes but is not limited to a flying car and other aircraft. The middle part of the flying vehicle where the carrying cabin for carrying people and goods is located constitutes the main part 200; one end of the arm 300 is connected to the main part 200 of the flying vehicle, and the motor assembly 100 and the rotor blade 400 are installed at the other end of the arm 300; the number of the arms 300 can be set to multiple, and the multiple arms 300 can be distributed on opposite sides of the main part 200. For example, when the flying vehicle is a flying car and the number of the arms 300 is four, the four arms 300 can be arranged on the left and right sides of the car body along the traveling direction, and the four arms 300 can be arranged roughly symmetrically based on the central axis of the car body, so that the flying car appears as follows: Figure 5 The quadrotor configuration shown has a relatively stable center of gravity and reliable flight.

[0064] The base portion of the stator structure 1 can be installed at one end of the arm 300 away from the main body 200 of the flying vehicle by locking, welding, etc.; the support shaft portion 101 extends in the vertical direction, and the lower end of the support shaft portion 101 is integrally formed with the base portion. The outer rotor structure 2 is rotatably connected to the support shaft portion 101 by matching the shaft hole between the connecting through hole 201 and the upper side of the support shaft portion 101, wherein bearings, sleeves and other devices can be arranged between the outer rotor structure 2 and the support shaft portion 101 to reduce the friction force when the outer rotor structure 2 rotates relative to the support shaft portion 101. A winding portion is arranged inside the stator structure 1, and the winding portion will form a magnetic field after being energized. The magnetic field will interact with the conductor in the outer rotor structure 2 to generate torque, thereby driving the outer rotor structure 2 to rotate relative to the stator structure 1, and then driving the rotor blades 400 on the outer rotor structure 2 to rotate relative to the arm 300, providing lift for the take-off and hovering of the flying vehicle.

[0065] Since the outer rotor drive structure can obtain a larger torque than the existing inner rotor drive structure, based on the technical solution of this embodiment, the reducer and its supporting components can be eliminated, and the driving of the rotor blades 400 can be realized in the form of outer rotor direct drive, thereby simplifying the motor structure and reducing the number of parts, making the motor assembly 100 more compact and lighter, thereby reducing the overall weight of the flying vehicle, making it easier to assemble and subsequently maintain the flying vehicle, and providing a favorable foundation for the lightweight development of the flying vehicle; in addition, since the support shaft 101 is directly integrated on the stator structure 1, and the support shaft 101 can provide cantilever support for the outer rotor structure 2, that is, there is no need to set a rotating shaft on the outer rotor structure 2, the design of the outer rotor structure 2 can be simplified, making the overall structure of the motor assembly 100 more simple and compact.

[0066] Optionally, refer to Figure 2 The motor assembly 100 further includes a connecting bearing 3, the inner ring of the connecting bearing 3 is sleeved on the supporting shaft 101, and the outer ring of the connecting bearing 3 is fixedly fitted in the connecting through hole 201; the connecting bearing 3 adopts a grease-lubricated bearing.

[0067] Specifically, the connecting bearing 3 can be a ball bearing, a roller bearing, etc. The connecting bearing 3 can be set to one or more and arranged along the axial direction of the support shaft 101, which is not limited here. By setting the connecting bearing 3, the rotational friction between the outer rotor structure 2 and the support shaft 101 can be reduced, wear can be reduced, the smooth rotation of the outer rotor structure 2 relative to the stator structure 1 can be ensured, and the service life of the device can be extended. The connecting bearing 3 uses a grease-lubricated bearing, which can save the complex oil circulation and filtration system compared to the oil-lubricated bearing, and the requirements for the sealing structure are relatively simple. In the case of vertical installation, the semi-solid grease is less likely to leak than the liquid lubricant, and can provide continuous lubrication for a long time without frequent replenishment or replacement, thereby simplifying the structure and reducing maintenance costs.

[0068] Optionally, refer to Figure 2 The connecting bearing 3 includes a first bearing 301 and a second bearing 302. The inner ring of the first bearing 301 is sleeved on the lower side of the support shaft 101, and the inner ring of the second bearing 302 is sleeved on the upper side of the support shaft 101. The outer ring of the first bearing 301 and the outer ring of the second bearing 302 are fixedly fitted in the connecting through hole 201.

[0069] In this embodiment, the first bearing 301 and the second bearing 302 are arranged at intervals along the axial direction of the support shaft portion 101, so that two fulcrums with a certain distance between them can be formed between the support shaft portion 101 and the connecting through hole 201. The two fulcrums can be used to form a better limiting effect on the outer rotor structure 2, avoiding that some areas on the outer rotor structure 2 are offset in the radial direction relative to the support shaft portion 101 due to being away from the bearings and lacking support, thereby ensuring the rotational stability of the outer rotor structure 2.

[0070] Optionally, refer to Figure 2 The motor assembly 100 further includes a stop ring 4 and a pressure cover 5. The stop ring 4 is sleeved on the support shaft 101, and the pressure cover 5 is connected to the upper end of the support shaft 101. The lower side of the support shaft 101 has a shaft shoulder 1011, and the hole wall of the connecting through hole 201 is convexly provided with a first flange 2011 arranged around the circumference.

[0071] The lower end face of the inner ring of the first bearing 301 abuts against the upper end face of the shoulder portion 1011, the upper end face of the inner ring of the first bearing 301 abuts against the lower end face of the limiting ring 4, and the upper end face of the outer ring of the first bearing 301 abuts against the lower end face of the first flange portion 2011; the lower end face of the inner ring of the second bearing 302 abuts against the upper end face of the limiting ring 4, the upper end face of the inner ring of the second bearing 302 abuts against the pressure cover 5, and the lower end face of the outer ring of the second bearing 302 abuts against the upper end face of the first flange portion 2011.

[0072] During the actual assembly process, the outer rotor structure 2 with the first bearing 301 installed can be firstly sleeved on the support shaft portion 101 from top to bottom until the lower end surface of the inner ring of the first bearing 301 abuts against the upper end surface of the shaft shoulder portion 1011; then the limiting ring 4 can be sleeved on the support shaft portion 101 from top to bottom until the lower end surface of the limiting ring 4 abuts against the upper end surface of the inner ring of the first bearing 301; and then the second bearing 302 can be sleeved on the support shaft portion 101 from top to bottom until the lower end surface of the inner ring of the second bearing 302 abuts against the upper end surface of the limiting ring 4, and the lower end surface of the outer ring of the second bearing 302 abuts against the first flange. The upper end surface of the part 2011 is abutted; finally, the pressure cover 5 is connected to the upper end part of the support shaft part 101, so as to press the inner ring of the second bearing 302 downwards through the pressure cover 5; in this way, the axial limitation of the first bearing 301 and the second bearing 302 is achieved through the abutment and cooperation between the shoulder part 1011, the limiting ring 4, the pressure cover 5 and the inner ring of the first bearing 301 and the inner ring of the second bearing 302, and the axial limitation of the outer rotor structure 2 relative to the support shaft part 101 is also achieved through the abutment and cooperation between the first bearing 301, the second bearing 302 and the first flange part 2011, which is also convenient for subsequent disassembly and replacement.

[0073] It can be understood that the diameter of the shoulder portion 1011, the outer diameter of the limit ring 4, the diameter of the portion of the pressure cover 5 used to press the second bearing 302, and the inner diameter of the first flange portion 2011 should all be set with reference to the diameters of the inner and outer rings of the first bearing 301 and the second bearing 302, so as to achieve the axial limiting effect while avoiding interference with the rotation between the inner and outer rings of the first bearing 301 and the second bearing 302.

[0074] Optionally, refer to Figure 2 The upper end surface of the support shaft 101 is provided with a locking hole (not shown in the figure), and a wire screw sleeve 6 is embedded in the locking hole; the pressure cover 5 has a shaft body 501 and a flange cover body 502, the upper end of the shaft body 501 is connected to the lower end surface of the flange cover body 502, the shaft body 501 is provided with an external thread, and the shaft body 501 is screwed into the wire screw sleeve 6 through the external thread; the upper end surface of the inner ring of the second bearing 302 abuts against the lower end surface of the flange cover body 502.

[0075] By embedding the wire screw sleeve 6 in the locking hole, an internal thread structure can be formed in the locking hole, so that the shaft body 501 of the gland 5 can be screwed into the locking hole by threaded connection; because the wire screw sleeve 6 has a certain elasticity, the load distribution on each turn of the thread can be relatively uniform, the pitch and tooth profile deviation can be eliminated to a certain extent, and vibration can be absorbed, thereby improving the thread connection strength and fatigue resistance between the gland 5 and the support shaft 101; in addition, the installed wire screw sleeve 6 is also easy to remove from the locking hole and replace with other wire screw sleeves 6 of different specifications to adapt to the external threads of different specifications on the shaft body 501. Preferably, the wire screw sleeve 6 can specifically adopt a self-locking wire screw sleeve 6 to prevent the wire screw sleeve 6 from slipping relative to the locking hole after installation.

[0076] In this embodiment, the shaft body 501 of the pressure cover 5 is connected to the supporting shaft 101 by means of a threaded locking method, which makes it easier to install and disassemble the pressure cover 5. The degree of tightening of the flange cover body 502 of the pressure cover 5 on the second bearing 302 can also be flexibly adjusted by controlling the screwing depth of the shaft body 501, thereby realizing the adjustment of the preload force of the first bearing 301 and the second bearing 302.

[0077] Optionally, refer to Figure 2 The motor assembly 100 also includes an adjusting gasket 7, which is sleeved on the supporting shaft portion 101; the adjusting gasket 7 is clamped between the upper end surface of the first bearing 301 and the lower end surface of the limiting ring 4, and / or the adjusting gasket 7 is clamped between the lower end surface of the second bearing 302 and the upper end surface of the limiting ring 4.

[0078] In this embodiment, the adjusting gasket 7 can be arranged only between the upper end surface of the first bearing 301 and the lower end surface of the limiting ring 4. Figure 2As shown, the adjusting gasket 7 is only arranged between the lower end face of the second bearing 302 and the upper end face of the stop ring 4. The adjusting gasket 7 can also be arranged between the upper end face of the first bearing 301 and the lower end face of the stop ring 4 and between the lower end face of the second bearing 302 and the upper end face of the stop ring 4. This is not limited here. By selecting adjusting gaskets 7 of different thicknesses and different numbers, different spacings between the first bearing 301 and the second bearing 302 can be adapted, and the first bearing 301 and the second bearing 302 can be preloaded in cooperation with the pressure cover 5.

[0079] Optionally, refer to Figure 2 The motor assembly 100 also includes a first sealing cover 8 and a first annular sealing member 9. The first sealing cover 8 covers the lower end surface of the first bearing 301. The outer periphery of the first annular sealing member 9 is fixed on the first flange portion 2011. The inner periphery of the first annular sealing member 9 is dynamically sealed with the outer cylindrical surface of the limiting ring 4. The first annular sealing member 9, the hole wall of the connecting through hole 201, the outer cylindrical surface of the limiting ring 4, and the first sealing cover 8 enclose a first sealed space 901.

[0080] Specifically, since the first bearing 301 is greased and not equipped with a sealing structure of conventional oil lubrication, there is a certain risk of leakage of the grease filled between the inner ring and the outer ring of the first bearing 301. Based on this problem, the present embodiment first uses the first sealing cover 8 to seal the lower end surface of the first bearing 301, thereby preventing the grease from leaking from the lower side of the first bearing 301; Figure 2 As shown, the inner circumference of the first sealing cover 8 can be clamped between the lower end surface of the inner ring of the first bearing 301 and the upper end surface of the shaft shoulder portion 1011, and the outer circumference of the first sealing cover 8 slightly abuts against the lower end surface of the outer ring of the first bearing 301 so as not to affect the rotation of the outer ring of the first bearing 301 relative to the inner ring; further, in this embodiment, a first annular seal 9 is arranged above the first bearing 301, and the first annular seal 9 can refer to the existing oil seal structure, and the mounting portion of the first annular seal 9 (that is, the outer circumference of the first annular seal 9) is fixed on the inner wall of the first flange portion 2011, and the sealing lip portion of the first annular seal 9 (that is, the inner circumference of the first annular seal 9) is fixed to the inner wall of the first flange portion 2011. part) is attached to the outer cylindrical surface of the limiting ring 4 and forms a dynamic sealing structure; based on the above arrangement, the first annular seal 9, the hole wall of the connecting through hole 201, the outer cylindrical surface of the limiting ring 4, and the first sealing cover 8 are enclosed to form a first sealed space 901, and the space between the inner ring and the outer ring of the first bearing 301 for filling with grease is in the first sealed space 901, so that the grease of the first bearing 301 can be always kept in the first sealed space 901 without leaking outward, and at the same time, based on the dynamic sealing cooperation between the first annular seal 9 and the limiting ring 4, the sealing effect can be ensured without affecting the rotation of the outer rotor structure 2 relative to the supporting shaft 101.

[0081] Optionally, refer to Figure 2 The motor assembly 100 also includes a second sealing cover 10 and a second annular seal 11. The second sealing cover 10 covers the upper end surface of the second bearing 302. The outer periphery of the second annular seal 11 is fixed on the first flange portion 2011. The inner periphery of the second annular seal 11 is dynamically sealed with the outer cylindrical surface of the limiting ring 4. The second annular seal 11, the hole wall of the connecting through hole 201, the outer cylindrical surface of the limiting ring 4, and the second sealing cover 10 enclose a second sealed space 1101.

[0082] Specifically, since the second bearing 302 is greased and not equipped with a sealing structure of conventional oil lubrication, there is a certain risk of leakage of the grease filled between the inner ring and the outer ring of the second bearing 302. Based on this problem, the present embodiment first uses the second sealing cover 10 to seal the upper end surface of the second bearing 302, thereby preventing the grease from leaking from the upper side of the second bearing 302; Figure 2 As shown, the inner circumference of the second sealing cover 10 can be clamped between the upper end surface of the inner ring of the second bearing 302 and the lower end surface of the flange cover body 502, and the outer circumference of the second sealing cover 10 slightly abuts against the upper end surface of the outer ring of the second bearing 302 so as not to affect the rotation of the outer ring of the second bearing 302 relative to the inner ring; further, in this embodiment, a second annular seal 11 is arranged below the second bearing 302, and the second annular seal 11 can refer to the existing oil seal structure, the mounting portion of the second annular seal 11 (that is, the outer circumferential portion of the second annular seal 11) is fixed on the inner wall of the second flange portion 20111, and the sealing lip portion of the second annular seal 11 (that is, the inner The outer cylindrical surface of the limiting ring 4 and the peripheral part) are attached to the outer cylindrical surface of the limiting ring 4 to form a dynamic sealing structure; based on the above arrangement, the second annular seal 11, the hole wall of the connecting through hole 201, the outer cylindrical surface of the limiting ring 4, and the second sealing cover 10 are enclosed to form a second sealed space 1101, and the space between the inner ring and the outer ring of the second bearing 302 for filling grease is in the second sealed space 1101, so that the grease of the second bearing 302 can be always kept in the second sealed space 1101 without leaking outward, and at the same time, based on the dynamic sealing cooperation between the second annular seal 11 and the limiting ring 4, the sealing effect can be ensured without affecting the rotation of the outer rotor structure 2 relative to the supporting shaft 101.

[0083] Optionally, refer to Figure 2 The inner cylindrical surface of the first flange portion 2011 is convexly provided with a second flange portion 20111 which is arranged circumferentially;

[0084] The motor assembly 100 includes a first hole elastic circlip 12, which is clamped on the first flange portion 2011; the upper end of the first annular seal 9 abuts against the lower end surface of the second flange portion 20111, and the lower end of the first annular seal 9 abuts against the upper end surface of the first hole elastic circlip 12;

[0085] And / or, the motor assembly 100 includes an elastic retaining ring 13 for a second hole, which is clamped on the first flange portion 2011; the lower end of the second annular seal 11 abuts against the upper end surface of the second flange portion 20111, and the upper end of the second annular seal 11 abuts against the lower end surface of the second hole elastic retaining ring 13.

[0086] In this embodiment, a first step position for accommodating the first annular seal 9 is formed between the lower end surface of the second flange portion 20111 and the first flange portion 2011, and the outer peripheral edge portion of the first annular seal 9 can be fixed in the first step position; a first sealing groove can be provided on the inner cylindrical surface of the first flange portion 2011, and the first sealing groove is arranged circumferentially and located below the first annular seal 9, such as Figure 2 As shown, the first hole elastic circlip 12 can be clamped in the first sealing groove, and the upper end surface of the first hole elastic circlip 12 abuts against the lower end of the outer peripheral portion of the first annular seal 9, so that the first hole elastic circlip 12 can be clamped in the first sealing groove. Figure 2 The upper and lower directions shown in the figure) form a limiting effect on the first annular seal 9.

[0087] Similarly, a second step position for accommodating the second annular seal 11 is formed between the upper end surface of the second flange portion 20111 and the first flange portion 2011, and the outer peripheral edge portion of the second annular seal 11 can be fixed in the second step position; a second sealing groove can be provided on the inner cylindrical surface of the first flange portion 2011, and the second sealing groove is arranged circumferentially and located above the second annular seal 11, such as Figure 2 As shown, the second hole elastic circlip 13 can be snapped into the second sealing groove, and the lower end surface of the second hole elastic circlip 13 abuts against the upper end of the outer peripheral portion of the second annular seal 11, so that the second hole elastic circlip 13 can be snapped into the second sealing groove, and the lower end surface of the second hole elastic circlip 13 abuts against the upper end of the outer peripheral portion of the second annular seal 11, so that the second hole elastic circlip 13 can be snapped into the second sealing groove, and the lower end surface of the second hole elastic circlip 13 can abut against the upper end of the outer peripheral portion of the second annular seal 11, so that the second hole elastic circlip 13 can abut against the upper end of the outer peripheral portion of the second annular seal 11, and ... Figure 2 The upper and lower directions shown in the figure) form a limiting effect on the second annular seal 11.

[0088] Based on the above arrangement, the axial limitation of the first annular seal 9 and the second annular seal 11 can be achieved in a convenient manner, and installation and disassembly are easy.

[0089] Optionally, refer to Figure 2 The outer cylindrical surface of the limiting ring 4 is convexly provided with a third flange portion 401 arranged circumferentially, and the surface of the third flange portion 401 is hardened and ground to form a first hardened layer, and the inner peripheral edge of the first annular seal 9 is dynamically sealed with the first hardened layer.

[0090] Optionally, refer to Figure 2 The outer cylindrical surface of the limiting ring 4 is convexly provided with a fourth flange portion 402 arranged circumferentially, and the surface of the fourth flange portion 402 is hardened and ground to form a second hardened layer, and the inner peripheral edge of the second annular seal 11 is dynamically sealed with the second hardened layer.

[0091] Specifically, the outer cylindrical surface of the limiting ring 4 may be provided with only the third flange portion 401 , or only the fourth flange portion 402 , or both the third flange portion 401 and the fourth flange portion 402 , which is not limited here. The third flange portion 401 is arranged at a position on the limiting ring 4 where relative friction with the first annular seal 9 is required, and the surface of the third flange portion 401 is hardened and ground, so that the hardness and roughness of the surface of the third flange portion 401 can be improved, so that a good sealing effect between the first annular seal 9 and the third flange portion 401 can be ensured while avoiding the first annular seal 9 from causing friction damage to the third flange portion 401 during the high-speed rotation of the outer rotor structure 2; similarly, the fourth flange portion 402 is arranged at a position on the limiting ring 4 where relative friction with the second annular seal 11 is required, and the surface of the fourth flange portion 402 is hardened and ground, so that the hardness and roughness of the surface of the fourth flange portion 402 can be improved, so that a good sealing effect between the second annular seal 11 and the fourth flange portion 402 can be ensured while avoiding the second annular seal 11 from causing friction damage to the fourth flange portion 402 during the high-speed rotation of the outer rotor structure 2.

[0092] Based on the above arrangement, on the one hand, the service life of the limit ring 4 can be extended; on the other hand, the positions on the limit ring 4 that need to be sealed with the first annular seal 9 and the second annular seal 11 can be thickened more specifically (that is, the third flange portion 401 and the fourth flange portion 402 are convexly provided) to adapt to the sizes of the first annular seal 9 and the second annular seal 11, while other positions on the limit ring 4 do not need to be thickened, thereby ensuring the lightweight of the limit ring 4 to the greatest extent.

[0093] Optionally, refer to Figure 2 The motor assembly 100 also includes a mechanical oil pump 14, which is installed on the stator structure 1, and the oil pump rotor 1401 of the mechanical oil pump 14 is transmission-connected to the outer rotor structure 2; when the outer rotor structure 2 rotates relative to the stator structure 1 under the force of the magnetic field, the outer rotor structure 2 is used to drive the oil pump rotor 1401 to rotate.

[0094] In this embodiment, the mechanical oil pump 14 can be Figure 2As shown, the oil pump rotor 1401 of the mechanical oil pump 14 is installed on the base part of the stator structure 1, and can be connected to the outer rotor structure 2 through gear meshing transmission, belt transmission, chain transmission and the like; when the outer rotor structure 2 rotates relative to the stator structure 1 under the action of the magnetic field and drives the rotor blades 400 to rotate, the outer rotor structure 2 can synchronously drive the oil pump rotor 1401 to rotate, so that the mechanical oil pump 14 can operate, and transport lubricating oil, fuel oil, cooling oil and other oils from the fuel tank to the corresponding parts of the flying vehicle, so as to achieve the effects of lubrication, cooling, cleaning, energy supply, pressure transmission and the like.

[0095] Based on the above arrangement, the mechanical energy of the outer rotor structure 2 during rotation can be fully utilized to drive the mechanical oil pump 14 to operate without the need to provide a separate drive device for the mechanical oil pump 14, thereby simplifying the internal structure of the flying vehicle and reducing material and installation and maintenance costs.

[0096] Optionally, refer to Figure 2 A first gear 15 is sleeved on the outer rotor structure 2, and a second gear 16 is sleeved on the oil pump rotor 1401, and the second gear 16 is meshed with the first gear 15; through the gear meshing transmission, the outer rotor structure 2 can more accurately transmit a larger torque to the oil pump rotor 1401, and has higher transmission efficiency, reliability and compact structure.

[0097] Optionally, refer to Figure 2 and Figure 3 The second gear 16 includes a gear tooth portion 1601 and an annular wheel core portion 1602. The inner periphery of the annular wheel core portion 1602 is snap-fitted with the rotating shaft portion of the oil pump rotor 1401, and the outer periphery of the annular wheel core portion 1602 is embedded in the center of the gear tooth portion 1601. The gear tooth portion 1601 is meshed with the first gear 15 for transmission; the gear tooth portion 1601 is made of self-lubricating plastic material, and the annular wheel core portion 1602 is made of metal material.

[0098] Specifically, the gear tooth portion 1601 includes: Figure 3 The annular structure shown in the figure has a plurality of gear bodies arranged circumferentially on the annular structure and meshing with the first gear 15. The inner periphery of the gear tooth portion 1601 and the outer periphery of the annular wheel core portion 1602 are provided with a plurality of groups of protrusions and recesses, so that the annular wheel core portion 1602 and the gear tooth portion 1601 can be firmly engaged with each other through the engagement of the protrusions and recesses; the inner periphery of the annular wheel core portion 1602 can be provided with the following: Figure 3The flat torque transmission part 16021 shown in the figure has the shortest straight-line distance between the flat torque transmission part 16021 and the central axis of the annular wheel core part 1602 smaller than the inner diameter of the annular wheel core part 1602. The rotating shaft part of the oil pump rotor 1401 can be provided with a flat position structure corresponding to the flat torque transmission part 16021. After the rotating shaft part of the oil pump rotor 1401 is inserted into the inner hole of the annular wheel core part 1602, the flat position structure abuts and cooperates with the flat torque transmission part 16021. Based on the above arrangement, when the outer rotor structure 2 rotates, the first gear 15 on the outer rotor structure 2 drives the gear part 1601 and the annular wheel core part 1602 to rotate. The annular wheel core part 1602 can transmit the torque to the rotating shaft part of the oil pump rotor 1401 through the abutment between the flat position structure and the flat torque transmission part 16021, driving the rotating shaft part to rotate, thereby operating the mechanical oil pump 14.

[0099] In this embodiment, by configuring the second gear 16 to be a structure that combines a gear tooth portion 1601 made of self-lubricating plastic material with an annular gear core portion 1602 made of metal material, on the one hand, the higher dimensional accuracy and structural strength of the metal material can be utilized to achieve connection and coordination between the second gear 16 and the oil pump rotor 1401 and reliable torque transmission; on the other hand, the self-lubricating plastic material can be utilized to reduce or eliminate the need for external lubricants for the gear teeth, thereby reducing maintenance costs, and can also reduce noise, reduce weight, etc.

[0100] Optionally, refer to Figures 2 to 4 The annular wheel core 1602 is provided with a plurality of fin structures 16022 protruding radially outward, and the plurality of fin structures 16022 are arranged at intervals along the circumferential direction to form an eddy current rotor; the motor assembly 100 also includes an eddy current stator 17, which is mounted on the stator structure 1 and arranged opposite to the eddy current rotor; the eddy current rotor is used to rotate relative to the eddy current stator 17 under the meshing action of the first gear 15 and the gear tooth portion 1601 to generate eddy currents.

[0101] Specifically, the eddy current stator 17 can be as follows Figure 2 As shown, it is installed on the base part of the stator structure 1 and is located below the eddy current rotor. The fin structure 16022 of the eddy current rotor is made of metal material to form an induction sheet, and the eddy current stator 17 forms an induction sensor. When the eddy current rotor rotates relative to the eddy current stator 17, the fin structure 16022 will generate an induced current each time it passes over the eddy current stator 17, and the empty slot part between each group of two adjacent fin structures 16022 will not generate an induced current when passing over the eddy current stator 17. In this way, a circuit such as Figure 4 The alternating induction current curve with peaks and troughs shown can be used to calculate the rotation speed of the motor in real time, thereby forming a closed-loop control of the motor rotation speed.

[0102] Based on the above arrangement, the mechanical energy generated by the rotation of the outer rotor structure 2 can be further utilized to drive the eddy current rotor to rotate and generate eddy currents, so as to realize closed-loop control of the motor speed without the need for a separate drive device for the generation of eddy currents. This improves energy utilization, further simplifies the internal structure of the flying vehicle, and reduces material and installation and maintenance costs.

[0103] Optionally, refer to Figure 2 The motor assembly 100 further includes a sealing end cover 18 , which is sealingly connected to the upper end of the outer rotor structure 2 . The sealing end cover 18 is located above the support shaft portion 101 and forms a cover for the support shaft portion 101 .

[0104] Illustratively, the outer peripheral sealing cover of the sealing end cover 18 is sealed on the upper end of the outer rotor structure 2, so that the sealing end cover 18 can be used to seal the support shaft portion 101 and other parts within the outer rotor structure 2 to prevent external impurities from entering, thereby protecting the interior of the motor assembly 100.

[0105] Optionally, refer to Figure 2 A accommodating chamber 102 is disposed inside the stator structure 1 . The motor assembly 100 further includes a motor controller 19 . The motor controller 19 is disposed in the accommodating chamber 102 . The motor controller 19 is electrically connected to the winding part of the stator structure 1 .

[0106] Specifically, the motor controller 19 can send a driving electrical signal to the winding part of the stator structure 1 based on a preset program, and can control the speed, torque, and direction of the outer rotor structure 2 by adjusting the amplitude, frequency, and other parameters of the driving electrical signal; in addition, the motor controller 19 can also send corresponding signals to other devices in the motor assembly 100 to achieve state monitoring, diagnosis, protection, and other functions. In this embodiment, by accommodating the motor controller 19 in the accommodating chamber 102 inside the stator structure 1, the motor controller 19 can be protected while fully utilizing the internal space of the motor, making the overall structure of the motor assembly 100 more streamlined and compact.

[0107] See also Figures 1 to 5 , the present application also proposes a flying vehicle, the flying vehicle comprising an arm 300, a rotor blade 400 and a motor assembly 100 in any of the above embodiments;

[0108] The stator structure 1 of the motor assembly 100 is installed on the arm 300, and the rotor blades 400 are installed on the outer rotor structure 2 of the motor assembly 100; the outer rotor structure 2 is used to rotate relative to the stator structure 1 under the action of the magnetic field to drive the rotor blades 400 to rotate relative to the arm 300.

[0109] In this embodiment, the flying vehicle includes but is not limited to a flying car and other aircraft. The middle part of the flying vehicle where the carrying cabin for carrying people and goods is located constitutes the main part 200; one end of the arm 300 is connected to the main part 200 of the flying vehicle, and the motor assembly 100 and the rotor blades 400 are installed at the other end of the arm 300; the number of arms 300 can be set to multiple, and the multiple arms 300 can be distributed on opposite sides of the main part 200. For example, when the flying vehicle is a flying car and the number of arms 300 is two, the two arms 300 can be set on the left and right sides of the car body along the direction of travel, and the two arms 300 can be roughly symmetrically arranged based on the central axis of the car body, so that the flying car presents a dual-rotor configuration as shown in the figure, and its center of gravity is relatively stable and the flight is reliable.

[0110] For the specific configuration of the motor assembly 100, please refer to the above embodiments. Since the flying vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, that is, the reducer and its supporting components can be eliminated, and the drive of the rotor blades 400 can be realized in the form of direct drive of the outer rotor, which simplifies the motor structure and reduces the number of parts, making the motor assembly 100 more compact and lighter, thereby reducing the overall weight of the flying vehicle, making it easier to assemble and subsequently maintain the flying vehicle, and providing a favorable foundation for the lightweight development of the flying vehicle; in addition, since the support shaft 101 is directly integrated on the stator structure 1, and the support shaft 101 can provide cantilever support for the outer rotor structure 2, that is, there is no need to set a rotating shaft on the outer rotor structure 2, the design of the outer rotor structure 2 can be simplified, making the overall structure of the motor assembly 100 more concise and compact.

[0111] The above description is only an exemplary embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A motor assembly, used in a flying vehicle, characterized in that: The motor assembly comprises: A stator structure having a supporting shaft; the stator structure is used to be mounted on the arm of the flying vehicle; The outer rotor structure has a connecting through hole, and the connecting through hole is rotatably matched with the supporting shaft; the outer rotor structure is used to install the rotor blades, and the outer rotor structure is used to rotate relative to the stator structure under the action of the magnetic field to drive the rotor blades to rotate relative to the machine arm.

2. The motor assembly according to claim 1, characterized in that: The motor assembly also includes a connecting bearing, the inner ring of the connecting bearing is sleeved on the supporting shaft, and the outer ring of the connecting bearing is fixedly fitted in the connecting through hole; the connecting bearing is a grease-lubricated bearing.

3. The motor assembly according to claim 2, characterized in that: The connecting bearing includes a first bearing and a second bearing, the inner ring of the first bearing is sleeved on the lower side of the supporting shaft portion, the inner ring of the second bearing is sleeved on the upper side of the supporting shaft portion, and the outer ring of the first bearing and the outer ring of the second bearing are fixedly fitted in the connecting through hole.

4. The motor assembly according to claim 3, characterized in that: The motor assembly further comprises a limiting ring and a pressure cover, wherein the limiting ring is sleeved on the supporting shaft portion, and the pressure cover is connected to the upper end portion of the supporting shaft portion; the lower side of the supporting shaft portion has a shaft shoulder portion, and the hole wall of the connecting through hole is convexly provided with a first flange portion arranged around the circumference; The lower end face of the inner ring of the first bearing abuts against the upper end face of the shoulder portion, the upper end face of the inner ring of the first bearing abuts against the lower end face of the limiting ring, and the upper end face of the outer ring of the first bearing abuts against the lower end face of the first flange portion; the lower end face of the inner ring of the second bearing abuts against the upper end face of the limiting ring, the upper end face of the inner ring of the second bearing abuts against the pressure cover, and the lower end face of the outer ring of the second bearing abuts against the upper end face of the first flange portion.

5. The motor assembly according to claim 4, characterized in that: The upper end surface of the support shaft is provided with a locking hole, in which a wire thread sleeve is embedded; the pressure cover has a shaft body and a flange cover body, the upper end of the shaft body is connected to the lower end surface of the flange cover body, the shaft body is provided with an external thread, and the shaft body is screwed into the wire thread sleeve through the external thread; the upper end surface of the inner ring of the second bearing abuts against the lower end surface of the flange cover body.

6. The motor assembly according to claim 4, characterized in that The motor assembly also includes an adjusting gasket, which is sleeved on the supporting shaft; the adjusting gasket is clamped between the upper end surface of the first bearing and the lower end surface of the limiting ring, and / or the adjusting gasket is clamped between the lower end surface of the second bearing and the upper end surface of the limiting ring.

7. The motor assembly according to claim 4, characterized in that The motor assembly further includes a first sealing cover and a first annular sealing member, wherein the first sealing cover covers the lower end surface of the first bearing, the outer periphery of the first annular sealing member is fixed to the first flange portion, the inner periphery of the first annular sealing member is dynamically sealed with the outer cylindrical surface of the limiting ring, and the first annular sealing member, the hole wall of the connecting through hole, the outer cylindrical surface of the limiting ring, and the first sealing cover enclose a first sealed space; And / or, the motor assembly also includes a second sealing cover and a second annular seal, the second sealing cover covers the upper end surface of the second bearing, the outer periphery of the second annular seal is fixed on the first flange portion, the inner periphery of the second annular seal dynamically seals with the outer cylindrical surface of the limiting ring, and the second annular seal, the hole wall of the connecting through hole, the outer cylindrical surface of the limiting ring, and the second sealing cover enclose a second sealed space.

8. The motor assembly according to claim 7, characterized in that The inner cylindrical surface of the first flange portion is convexly provided with a second flange portion arranged around the circumference; The motor assembly includes a first hole elastic circlip, which is clamped on the first flange; the upper end of the first annular seal abuts against the lower end surface of the second flange, and the lower end of the first annular seal abuts against the upper end surface of the first hole elastic circlip; And / or, the motor assembly includes an elastic retaining ring for a second hole, which is clamped on the first flange portion; the lower end of the second annular seal abuts against the upper end surface of the second flange portion, and the upper end of the second annular seal abuts against the lower end surface of the second hole elastic retaining ring.

9. The motor assembly according to claim 7, characterized in that: The outer cylindrical surface of the limiting ring is convexly provided with a third flange portion which is arranged circumferentially, the surface of the third flange portion is hardened and ground to form a first hardened layer, and the inner peripheral edge of the first annular seal is dynamically sealed with the first hardened layer; And / or, the outer cylindrical surface of the limiting ring is convexly provided with a fourth flange portion arranged circumferentially, the surface of the fourth flange portion is hardened and ground to form a second hardened layer, and the inner peripheral edge of the second annular seal is dynamically sealed with the second hardened layer.

10. The motor assembly according to claim 1, characterized in that The motor assembly also includes a mechanical oil pump, which is installed on the stator structure. The oil pump rotor of the mechanical oil pump is transmission-connected to the outer rotor structure. When the outer rotor structure rotates relative to the stator structure under the force of the magnetic field, the outer rotor structure is used to drive the oil pump rotor to rotate.

11. The motor assembly according to claim 10, characterized in that A first gear is sleeved on the outer rotor structure, and a second gear is sleeved on the oil pump rotor. The second gear is meshed with the first gear.

12. The motor assembly according to claim 11, characterized in that The second gear includes a gear tooth portion and an annular wheel core portion, the inner periphery of the annular wheel core portion is snap-fitted with the rotating shaft portion of the oil pump rotor, the outer periphery of the annular wheel core portion is embedded in the center of the gear tooth portion, and the gear tooth portion is meshed with the first gear for transmission; the gear tooth portion is made of self-lubricating plastic material, and the annular wheel core portion is made of metal material.

13. The motor assembly according to claim 12, characterized in that The annular wheel core portion is provided with a plurality of fin structures protruding radially outward, and the plurality of fin structures are arranged at intervals along the circumferential direction to form an eddy current rotor; the motor assembly also includes an eddy current stator, which is mounted on the stator structure and arranged opposite to the eddy current rotor; the eddy current rotor is used to rotate relative to the eddy current stator under the meshing action of the first gear and the gear tooth portion to generate eddy currents.

14. The motor assembly according to any one of claims 1 to 13, characterized in that: The motor assembly further comprises a sealing end cover, which is sealingly connected to the upper end of the outer rotor structure, and the sealing end cover is located above the supporting shaft portion and forms a cover for the supporting shaft portion.

15. The motor assembly according to any one of claims 1 to 13, characterized in that: The stator structure is provided with a receiving chamber inside, and the motor assembly further includes a motor controller. The motor controller is provided in the receiving chamber, and the motor controller is electrically connected to the winding part of the stator structure.

16. A flying vehicle, characterized in that: The flying vehicle comprises an arm, rotor blades and a motor assembly as claimed in any one of claims 1 to 15; The stator structure of the motor assembly is mounted on the machine arm, and the rotor blades are mounted on the outer rotor structure of the motor assembly; the outer rotor structure is used to rotate relative to the stator structure under the force of the magnetic field to drive the rotor blades to rotate relative to the machine arm.

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