Driving system with heat dissipation structure and low-altitude aircraft

Abstract

The utility model provides a driving system with a heat dissipation structure and a low-altitude aircraft, the driving system comprises a motor shell, a motor assembly, a planet assembly, a pump body structure and the heat dissipation structure, the end part of a planet carrier of the planet assembly penetrates out of a first avoiding through hole to be in driving connection with a propeller; an oil storage cavity of the pump body structure is communicated with an oil passage inlet of the oil passage; a first oil passage outlet of the oil passage is communicated with the first annular space; and / or, the second sub-containing cavity is communicated with the first sub-ring cavity, and a second oil channel outlet of the oil passing channel is communicated with the second sub-containing cavity; the heat dissipation structure is arranged at the axial end, away from the motor shell, of the pump body structure. The utility model solves the problem that part of low-altitude aircrafts in the prior art lubricate and cool stators and bearings through lubricating oil in equipment, but the lubricating oil after heat exchange is always in a high-temperature state and cannot effectively take away heat on the stators and / or the bearings.

Description

Technical Field

[0001] The utility model relates to the technical field of low-altitude flight equipment, in particular to a drive system with a heat dissipation structure and a low-altitude aircraft. Background Art

[0002] As the low-altitude economy becomes increasingly popular, electric vertical take-off and landing aircraft (eVTOL) are widely favored by the public due to their safety, intelligence, economy, and environmental protection. Electric vertical take-off and landing aircraft (eVTOL) enable people and goods to move quickly and flexibly at low altitudes in cities in a seamless and economical manner, which is conducive to the rapid development of low-altitude airspace resources in cities, making electric vertical take-off and landing aircraft (eVTOL) gradually become the mainstream development direction of urban air transportation.

[0003] Existing electric vertical take-off and landing aircraft (eVTOL) mainly adopts direct motor drive, that is, the propeller is driven to rotate by the outer rotor, thereby driving the electric vertical take-off and landing aircraft (eVTOL) to operate. This electric vertical take-off and landing aircraft (eVTOL) using direct motor drive has the following technical problems: the stator of the motor and / or the bearings inside the motor are not lubricated and cooled by lubricating oil, resulting in the bearings being lubricated only by consuming their own grease during long-term use. The consumption of the bearings' own grease reduces the service life of the bearings, seriously affecting the normal operation of the electric vertical take-off and landing aircraft (eVTOL) and posing a risk of flight failure.

[0004] Some existing electric vertical take-off and landing aircraft (eVTOL) are directly driven by motors, which easily causes the motors to operate in a low speed range for a long time, failing to bring into play the high speed characteristics of the motors, which is not conducive to the driving efficiency of the drive system and also requires a larger motor size.

[0005] Some existing electric vertical take-off and landing (eVTOL) vehicles use internal lubricating oil to lubricate and cool the stator and bearings. However, the lubricating oil after heat exchange is often in a high-temperature state and cannot effectively remove heat from the stator and / or bearings. Utility Model Content

[0006] The main purpose of the present utility model is to provide a drive system and a low-altitude aircraft with a heat dissipation structure to solve the problem in the prior art that some electric vertical take-off and landing aircraft (eVTOL) use lubricating oil inside the equipment to lubricate and cool the stator and bearings. However, the lubricating oil after heat exchange is often in a high-temperature state and cannot effectively remove the heat from the stator and / or bearings.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a drive system with a heat dissipation structure is provided for connecting to the propeller drive of a low-altitude aircraft, the drive system comprising a motor housing, a motor assembly, a planetary assembly, a pump body structure and a heat dissipation structure, the motor housing having a accommodating chamber and a first avoidance through-hole connected to the accommodating chamber, and the motor housing having an oil passage; the motor assembly is arranged in the accommodating chamber, and the motor assembly comprises a motor drive shaft and a sun gear, the sun gear is sleeved on the outer peripheral side of the motor drive shaft, and the cavity wall surface of the accommodating chamber opposite to the sun gear has a ring gear structure; the planetary assembly comprises a planetary carrier and a planetary gear, at least part of the cover of one axial end of the planetary carrier is arranged on the outer peripheral side of the motor drive shaft, and the other axial end of the planetary carrier passes through the first avoidance through-hole for connecting to the propeller drive; the planetary gear is rotatably arranged on the planetary carrier, and at the same time is externally meshed with the sun gear and the ring gear structure; the pump body structure is arranged at one end of the motor housing away from the first avoidance through-hole, the pump body structure has an oil storage chamber and an oil return chamber that are connected, and the oil storage chamber is connected to The oil channel inlet of the oil channel is connected; wherein, a first annular space is formed between a part of the outer circumference of the planetary carrier located in the first avoidance hole and a part of the hole wall surface of the first avoidance hole, the first annular space is used to accommodate the first bearing structure, the first oil channel outlet of the oil channel is connected to the first annular space to lubricate and cool the first bearing structure, and the first annular space is connected to the oil return chamber; and / or, the motor assembly also includes a stator structure, the accommodating chamber has a first sub-annular chamber and a second sub-accommodating chamber, the stator structure is located in the first sub-annular chamber, at least the planetary gear and the ring gear structure are located in the second sub-accommodating chamber, and the second sub-accommodating chamber is connected to the first sub-annular chamber, the second oil channel outlet of the oil channel is connected to the second sub-accommodating chamber to lubricate and cool the planetary gear and ring gear structure located in the second sub-accommodating chamber, and to cool the stator structure located in the first sub-annular chamber, and the first sub-annular chamber is connected to the oil return chamber; the heat dissipation structure is arranged at the axial end of the pump body structure away from the motor housing, for dissipating the heat of the lubricating oil in the oil storage chamber and / or the oil return chamber.

[0008] Furthermore, the heat dissipation structure is detachably connected to the pump body structure.

[0009] Furthermore, the motor housing and the motor assembly are concentrically arranged; and / or the motor assembly and the pump body structure are concentrically arranged; and / or the heat dissipation structure and the pump body structure are concentrically arranged.

[0010] Furthermore, the heat dissipation structure includes a heat dissipation shell, which has a receiving groove, and the groove of the receiving groove faces one side of the pump body structure, so that an installation space is formed between the groove wall of the receiving groove and the end surface of the rotor pump shell of the pump body structure facing away from the motor shell; the drive system also includes a motor controller, which is arranged in the installation space and is controlled and connected to the motor assembly.

[0011] Furthermore, the heat dissipation shell has a first installation area and a second installation area on the end face facing away from the pump body structure, and the second installation area is located on the outer peripheral side of the first installation area; the heat dissipation structure also includes a fan and heat dissipation fins, wherein the fan is rotatably arranged in the first installation area; there are multiple heat dissipation fins, and the multiple heat dissipation fins are radially arranged in the second installation area.

[0012] Furthermore, the number of fan blades is smaller than the number of heat dissipation fins.

[0013] Furthermore, the length of the heat dissipation fins in the radial direction of the heat dissipation housing is greater than the length of the fan blades in the radial direction of the heat dissipation housing.

[0014] Furthermore, the planetary carrier includes a planetary carrier body, which includes a first planetary shaft segment, a second planetary shaft segment, a third planetary shaft segment, and a fourth planetary shaft segment connected in sequence in the direction away from the motor assembly; the outer diameter D1 of the first planetary shaft segment, the outer diameter D2 of the second planetary shaft segment, the outer diameter D3 of the third planetary shaft segment, and the outer diameter D4 of the fourth planetary shaft segment satisfy: D1=D4<D3<D2, and the planetary gear is rotatably arranged at the second planetary shaft segment.

[0015] Furthermore, the second planetary shaft segment has multiple planetary gear shafts, which are arranged at intervals around the circumference of the second planetary shaft segment. There are multiple planetary gears, which correspond one-to-one to the multiple planetary gear shafts, and each planetary gear is sleeved on the outer circumference of the corresponding planetary gear shaft; a third annular space is formed between the outer circumferential surface of the planetary gear shaft and the inner circumferential surface of the planetary wheel, and the drive system also includes a third bearing structure, which is located in the third annular space.

[0016] Furthermore, the motor housing includes a cylindrical structure, a top cover plate, a bottom cover plate and a cavity structure, both axial ends of the cylindrical structure are open, and the cylindrical structure has a accommodating cavity; the top cover plate is arranged at the axial first end of the cylindrical structure, and the axial first end of the top cover plate has a first avoidance hole; the bottom cover plate is arranged at the axial second end of the cylindrical structure; wherein the cylindrical wall surface of the cylindrical structure, the top wall surface of the top cover plate facing the cylindrical structure side, and the bottom wall surface of the bottom cover plate facing the cylindrical structure side form an accommodating cavity, and a supporting boss is protruding from the cylindrical wall surface; the cavity structure is overlapped on the supporting boss to divide the accommodating cavity into a first sub-accommodating cavity and a second sub-accommodating cavity, the cavity structure has a third avoidance hole, and the first The end is located in the first sub-accommodating chamber, and the second end of the motor drive shaft passes through the first avoidance hole and extends into the second sub-accommodating chamber; the cavity wall of the second sub-accommodating chamber is provided with a gear ring structure, the first planetary shaft segment and the second planetary shaft segment are both located in the second sub-accommodating chamber, and parts of the third planetary shaft segment and the fourth planetary shaft segment are both located at the first avoidance hole; a first annular space is formed between the outer circumferential surface of the third planetary shaft segment and the hole wall surface of the first avoidance hole, and the drive system also includes a first bearing structure, and the first bearing structure is located in the first annular space; an oil seal structure is sandwiched between part of the outer circumferential surface of the fourth planetary shaft segment and the hole wall surface of the first avoidance hole, and the end of the fourth planetary shaft segment away from the third planetary shaft segment extends out of the first avoidance hole.

[0017] Furthermore, a second avoidance hole is opened at the end of the bottom cover plate away from the first avoidance hole, and an annular boss is provided around the outer periphery of the second avoidance hole to form an annular support surface between the inner circle of the annular boss and the hole wall surface of the second avoidance hole, and an avoidance sink is formed between the inner circle of the annular support surface and the hole wall surface of the second avoidance hole; a second annular space is formed between the outer peripheral surface of the motor drive shaft away from the planetary assembly and the inner peripheral surface of the annular boss; the drive system also includes a second bearing structure, which is located in the second annular space and is supported on the annular support surface.

[0018] Furthermore, in the radial direction of the motor housing, the first sub-accommodating cavity includes, from the outside to the inside, a first sub-annular cavity, a second sub-annular cavity, and a central cavity that are connected to each other; the motor assembly includes a motor drive shaft, a rotor structure, an annular oil baffle plate, and a stator structure, wherein a portion of the motor drive shaft is rotatably arranged in the central cavity, and the motor drive shaft sleeve is provided with a shaft section of a sun gear extending into the second sub-accommodating cavity; the rotor structure is sleeved on the outer peripheral side of the motor drive shaft and is located in the second sub-annular cavity; the annular oil baffle plate is sleeved on the outer peripheral side of the rotor structure and is located at the boundary between the second sub-annular cavity and the first sub-annular cavity; the stator structure is sleeved on the outer peripheral side of the annular oil baffle plate, and the stator structure is located in the first sub-annular cavity.

[0019] Furthermore, the planetary carrier body has a through hole, which passes through at least the end face of the planetary carrier body toward one end of the motor assembly, so that the end of the motor drive shaft having the sun gear extends into the through hole, and the annular area for installing the planetary gear is connected to the through hole; the motor drive shaft has a fourth avoidance through hole, which passes through the axial ends of the motor drive shaft; the planetary carrier also includes a through shaft, the first end of the through shaft extends into the through hole, and the second end of the through shaft passes through the fourth avoidance through hole and the second avoidance through hole and is driven and connected to the pump body structure.

[0020] Furthermore, the pump body structure includes a rotor pump housing, which has an oil storage chamber and an oil return chamber. The rotor pump housing is arranged at the end of the motor housing away from the first avoidance hole, and the end of the rotor pump housing away from the motor housing has a sixth avoidance hole; an eighth avoidance hole is opened at a position opposite to the seventh avoidance hole of the motor controller in the first installation area; the second end of the through shaft passes through the sixth avoidance hole, the seventh avoidance hole, and the eighth avoidance hole in sequence and is connected to the fan drive.

[0021] The outer peripheral surface of the through-shaft motor housing is provided with a plurality of first heat sinks, and the plurality of first heat sinks are radially arranged at intervals around the circumference of the motor housing; and / or the outer peripheral surface of the rotor pump housing of the pump body structure is provided with a plurality of second heat sinks, and the plurality of second heat sinks are radially arranged at intervals around the circumference of the rotor pump housing.

[0022] According to another aspect of the present invention, a low-altitude aircraft is provided, comprising a drive system and a propeller, wherein the drive system is drive-connected to the propeller, and the drive system is the above-mentioned drive system.

[0023] The present invention provides a drive system having a planetary assembly, wherein the drive system comprises a motor housing, a motor assembly, and a planetary assembly, wherein the motor housing has a housing and a first avoidance hole communicating with the housing; the motor assembly is disposed within the housing, and the motor assembly comprises a motor drive shaft and a sun gear, the sun gear being sleeved on the outer circumference of the motor drive shaft, and a ring gear structure being provided on a wall of the housing opposite to the sun gear; the planetary assembly comprises a planetary carrier and a planetary gear, wherein at least a portion of one axial end of the planetary carrier is covered on the outer circumference of the motor drive shaft, and the other axial end of the planetary carrier extends through the first avoidance hole for connection to a propeller drive; the planetary gear is rotatably disposed on the planetary carrier and simultaneously engages externally with both the sun gear and the ring gear structure. Thus, by connecting the planetary carrier to the propeller drive, and adding the planetary assembly as a reduction gear on the basis of the motor assembly, the drive efficiency of the drive system can be significantly improved, the high speed characteristics of the motor drive shaft can be fully utilized, and the miniaturization design of the entire drive system can be facilitated.

[0024] In addition, the present application sets up a heat dissipation structure, which serves the purpose of dissipating the heat of the lubricating oil in the oil storage chamber and / or the oil return chamber, thereby ensuring that the lubricating oil in the oil storage chamber and / or the oil return chamber can always maintain a preset temperature to ensure its lubrication and heat exchange effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 A schematic structural diagram of one end of a top cover plate of a drive system according to an optional embodiment of the present utility model is shown;

[0027] Figure 2 Shown Figure 1 A schematic structural diagram of the other axial end of the drive system;

[0028] Figure 3 Shown Figure 1 A schematic diagram of the structure of the top cover of the drive system from a top view perspective;

[0029] Figure 4 Shown Figure 3 Schematic diagram of the cross-sectional structure at AA in FIG;

[0030] Figure 5 Shown Figure 4 Schematic diagram of the decomposed structure of the drive system in .

[0031] The above drawings include the following reference numerals:

[0032] 10. Motor housing; 11. Accommodation cavity; 111. First sub-annular cavity; 114. Gear ring structure; 115. First sub-accommodation cavity; 116. Second sub-accommodation cavity; 12. First avoidance hole; 122. First bearing structure; 123. Oil seal structure; 13. Oil passage; 131. First oil passage outlet; 132. Second oil passage outlet; 133. First channel section; 134. Second channel section; 14. Cylinder structure; 141. Support boss; 1411. First connecting hole; 15. Top cover plate; 151. Transition oil Segment; 152, connecting ring segment; 153, reinforcing rib; 154, first axial connecting hole; 16, bottom cover plate; 162, annular boss; 163, annular support surface; 164, avoidance sink; 166, oil outlet; 17, first heat sink; 18, cavity structure; 181, third avoidance hole; 182, column; 1821, second radial connecting hole; 184, fourth bearing structure; 185, first annular support plate; 1851, stop protrusion; 1852, second connecting hole; 186, second annular support plate;

[0033] 20. Motor assembly; 211. Stator structure; 212. Motor drive shaft; 2121. Fourth avoidance hole; 213. Rotor structure; 214. Sun gear; 215. Annular oil baffle;

[0034] 30. Pump body structure; 31. Rotor pump housing;

[0035] 40. Second bearing structure;

[0036] 50. Heat dissipation structure; 51. Heat dissipation housing; 511. Accommodation slot; 52. Fan; 53. Heat dissipation fins;

[0037] 60. Motor controller;

[0038] 70. Planetary assembly; 71. Planet carrier; 711. Planet carrier body; 7111. First planetary shaft segment; 7112. Second planetary shaft segment; 7113. Third planetary shaft segment; 7114. Fourth planetary shaft segment; 7115. Planetary gear shaft; 7116. Second axial communication hole; 7117. First radial communication hole; 7118. Annular limiting groove; 712. Through shaft; 72. Planetary gear; 722. Third bearing structure;

[0039] 80. Fifth bearing structure. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In order to solve the problem in the prior art that some electric vertical take-off and landing aircraft (eVTOL) use lubricating oil inside the equipment to lubricate and cool the stator and bearings, but the lubricating oil after heat exchange is often in a high-temperature state and cannot effectively remove the heat from the stator and / or bearings, the utility model provides a drive system and a low-altitude aircraft with a heat dissipation structure, wherein the low-altitude aircraft includes a drive system and a propeller, the drive system is drive-connected to the propeller, and the drive system is the drive system described above and below.

[0042] like Figures 1 to 5As shown, a drive system with a heat dissipation structure is used to connect to the propeller drive of a low-altitude aircraft. The drive system includes a motor housing 10, a motor assembly 20, a planetary assembly 70, a pump body structure 30 and a heat dissipation structure 50, wherein the motor housing 10 has a receiving cavity 11 and a first avoidance hole 12 connected to the receiving cavity 11, and the motor housing 10 has an oil passage 13; the motor assembly 20 is arranged in the receiving cavity 11, and the motor assembly 20 includes a motor drive shaft 212 and a sun gear 214, the sun gear 214 is sleeved on the outer peripheral side of the motor drive shaft 212, and the cavity wall opposite to the receiving cavity 11 and the sun gear 214 is The surface of the planetary assembly 70 has a ring gear structure 114; the planetary assembly 70 includes a planetary carrier 71 and a planetary gear 72, wherein at least part of one axial end of the planetary carrier 71 is covered on the outer peripheral side of the motor drive shaft 212, and the other axial end of the planetary carrier 71 passes through the first avoidance hole 12 for connection with the propeller drive; the planetary gear 72 is rotatably arranged on the planetary carrier 71, and at the same time is externally meshed with the sun gear 214 and the ring gear structure 114; the pump body structure 30 is arranged at one end of the motor housing 10 away from the first avoidance hole 12, and the pump body structure 30 has an oil storage chamber and an oil return chamber that are connected, and the oil storage chamber is connected to the oil passage 13 The inlet is connected; wherein, a first annular space is formed between a portion of the outer circumferential surface of the planetary carrier 71 located in the first avoidance hole 12 and a portion of the hole wall surface of the first avoidance hole 12, and the first annular space is used to accommodate the first bearing structure 122, and the first oil channel outlet 131 of the oil channel 13 is connected to the first annular space to lubricate and cool the first bearing structure 122, and the first annular space is connected to the return oil chamber; and / or, the motor assembly 20 also includes a stator structure 211, the accommodating chamber 11 has a first sub-annular chamber 111 and a second sub-accommodating chamber 116, the stator structure 211 is located in the first sub-annular chamber 111, and at least the planetary The wheel 72 and the ring gear structure 114 are located in the second sub-accommodating chamber 116, and the second sub-accommodating chamber 116 is connected to the first sub-annular chamber 111. The second oil channel outlet 132 of the oil channel 13 is connected to the second sub-accommodating chamber 116 to lubricate and cool the planetary wheel 72 and the ring gear structure 114 located in the second sub-accommodating chamber 116, and to cool the stator structure 211 located in the first sub-annular chamber 111. The first sub-annular chamber 111 is connected to the oil return chamber; the heat dissipation structure 50 is arranged at the axial end of the pump body structure 30 away from the motor housing 10, so as to dissipate the heat of the lubricating oil in the oil storage chamber and / or the oil return chamber.

[0043] By applying the technical solution of the present invention, a drive system with a planetary assembly is provided, which includes a motor housing 10, a motor assembly 20 and a planetary assembly 70, wherein the motor housing 10 has a accommodating chamber 11 and a first avoidance through-hole 12 connected to the accommodating chamber 11; the motor assembly 20 is arranged in the accommodating chamber 11, and the motor assembly 20 includes a motor drive shaft 212 and a sun gear 214, the sun gear 214 is sleeved on the outer peripheral side of the motor drive shaft 212, and a ring gear structure 114 is provided at the cavity wall surface of the accommodating chamber 11 opposite to the sun gear 214; the planetary assembly 70 includes a planet carrier 71 and a planetary gear 72, wherein at least part of one axial end of the planet carrier 71 is covered on the outer peripheral side of the motor drive shaft 212, and the other axial end of the planet carrier 71 passes through the first avoidance through-hole 12 for connection with the propeller drive; the planetary gear 72 is rotatably arranged on the planet carrier 71, and is simultaneously externally meshed with the sun gear 214 and the ring gear structure 114. In this way, by connecting the planetary carrier 71 with the propeller drive, adding a planetary assembly 70 as a reduction device on the basis of the motor assembly 20 can significantly improve the driving efficiency of the drive system, make full use of the high speed characteristics of the motor drive shaft 212, and be conducive to the miniaturization design of the entire drive system.

[0044] In addition, the present application sets up a heat dissipation structure 50, which serves the purpose of dissipating the heat of the lubricating oil in the oil storage chamber and / or the oil return chamber, thereby ensuring that the lubricating oil in the oil storage chamber and / or the oil return chamber can always maintain a preset temperature to ensure its lubrication and heat exchange effects.

[0045] Optionally, the heat dissipation structure 50 is detachably connected to the pump body structure 30 , thereby ensuring that the heat dissipation structure 50 and the pump body structure 30 are easily assembled and disassembled.

[0046] It should be noted that, in the present application, the motor housing 10 is concentrically arranged with the motor assembly 20; and / or, the motor assembly 20 is concentrically arranged with the pump body structure 30; and / or, the heat dissipation structure 50 is concentrically arranged with the pump body structure 30.

[0047] like Figure 4 and Figure 5 As shown, the heat dissipation structure 50 includes a heat dissipation housing 51, which has a receiving groove 511, and the notch of the receiving groove 511 faces the side of the pump body structure 30, so that an installation space is formed between the groove wall surface of the receiving groove 511 and the end surface of the rotor pump housing 31 of the pump body structure 30 facing away from the motor housing 10. The drive system also includes a motor controller 60, which is arranged in the installation space and is controlled and connected to the motor assembly 20. In this way, the installation reliability of the motor controller 60 is ensured. It can also play a protective role and heat dissipation role for the motor controller 60.

[0048] like Figure 4As shown, the heat dissipation shell 51 has a first installation area and a second installation area on the end face facing away from the pump body structure 30, and the second installation area is located on the outer peripheral side of the first installation area; the heat dissipation structure 50 also includes a fan 52 and heat dissipation fins 53, wherein the fan 52 is rotatably arranged in the first installation area; there are multiple heat dissipation fins 53, and the multiple heat dissipation fins 53 are radially arranged in the second installation area.

[0049] It should be noted that, in the present application, considering that the area of ​​the second mounting area is larger than that of the first mounting area, optionally, the number of blades of the fan 52 is smaller than the number of the heat dissipation fins 53. In this way, the heat dissipation reliability of the fan 52 and the heat dissipation reliability of the heat dissipation fins 53 are ensured.

[0050] like Figure 4 As shown, the radial length of the heat dissipation fins 53 of the heat dissipation housing 51 is greater than the radial length of the fan blades of the fan 52 of the heat dissipation housing 51. This ensures that the rotation of the fan 52 drives the air flow at the bottom, and the flowing air flows to the heat dissipation fins 53 and exchanges heat with the heat dissipation fins 53, thereby removing heat from the motor controller 60 and heat from the lubricating oil in the oil storage chamber and / or the oil return chamber.

[0051] like Figure 5 As shown, the planetary carrier 71 includes a planetary carrier body 711, and the planetary carrier body 711 includes a first planetary shaft segment 7111, a second planetary shaft segment 7112, a third planetary shaft segment 7113, and a fourth planetary shaft segment 7114 connected in sequence in the direction away from the motor assembly 20; the outer diameter D1 of the first planetary shaft segment 7111, the outer diameter D2 of the second planetary shaft segment 7112, the outer diameter D3 of the third planetary shaft segment 7113, and the outer diameter D4 of the fourth planetary shaft segment 7114 satisfy: D1=D4<D3<D2, and the planetary gear 72 is rotatably arranged at the second planetary shaft segment 7112.

[0052] like Figure 5 As shown, the second planetary shaft segment 7112 has multiple planetary gear shafts 7115, which are spaced apart around the circumference of the second planetary shaft segment 7112. There are multiple planetary gears 72, each corresponding one-to-one to the multiple planetary gear shafts 7115. Each planetary gear 72 is sleeved on the outer circumference of a corresponding planetary gear shaft 7115. A third annular space is formed between the outer circumference of the planetary gear shaft 7115 and the inner circumference of the planetary gear 72. The drive system also includes a third bearing structure, which is located within the third annular space to ensure reliable power transmission.

[0053] Preferably, there are three planetary gear shafts 7115 and three planetary wheels 72.

[0054] like Figure 4 and Figure 5 As shown, the motor housing 10 includes a cylindrical structure 14, a top cover plate 15, a bottom cover plate 16 and a cavity structure 18. Both axial ends of the cylindrical structure 14 are open, and the cylindrical structure 14 has a accommodating cavity 11; the top cover plate 15 is covered at the axial first end of the cylindrical structure 14, and the axial first end of the top cover plate 15 has a first avoidance hole 12; the bottom cover plate 16 is covered at the axial second end of the cylindrical structure 14; wherein, the cylindrical wall surface of the cylindrical structure 14, the top wall surface of the top cover plate 15 facing the cylindrical structure 14 side, and the bottom wall surface of the bottom cover plate 16 facing the cylindrical structure 14 side form an accommodating cavity 11, and a supporting boss 141 is protruding on the cylindrical wall surface; the cavity structure 18 is overlapped on the supporting boss 141 to divide the accommodating cavity 11 into a first sub-accommodating cavity 115 and a second sub-accommodating cavity 116, and the cavity structure 18 has a third avoidance hole 181, and the first end of the motor drive shaft 212 is located at In the first sub-accommodating chamber 115, the second end of the motor drive shaft 212 passes through the first avoidance hole 12 and extends into the second sub-accommodating chamber 116; a gear ring structure 114 is provided on the cavity wall of the second sub-accommodating chamber 116, the first planetary shaft segment 7111 and the second planetary shaft segment 7112 are both located in the second sub-accommodating chamber 116, and parts of the third planetary shaft segment 7113 and the fourth planetary shaft segment 7114 are both located at the first avoidance hole 12; a first annular space is formed between the outer circumferential surface of the third planetary shaft segment 7113 and the hole wall surface of the first avoidance hole 12, and the drive system also includes a first bearing structure 122, which is located in the first annular space; an oil seal structure 123 is sandwiched between part of the outer circumferential surface of the fourth planetary shaft segment 7114 and the hole wall surface of the first avoidance hole 12, and the end of the fourth planetary shaft segment 7114 away from the third planetary shaft segment 7113 extends out of the first avoidance hole 12. In this way, by setting the motor housing 10 to a structural form including a cylindrical structure 14, a top cover plate 15 and a bottom cover plate 16, the convenience of assembly of the drive system is ensured, and the reliability of the accommodation of the motor assembly 20 and the planetary assembly 70 in the accommodating cavity 11 surrounded by the cylindrical structure 14, the top cover plate 15 and the bottom cover plate 16 can be ensured. While making full use of the space, the miniaturized design of the drive system can also be ensured.

[0055] like Figure 4As shown, a second escape hole is formed at the end of the bottom cover plate 16 facing away from the first escape hole 12. An annular boss 162 is provided around the outer periphery of the second escape hole, forming an annular support surface 163 between the inner circle of the annular boss 162 and the wall surface of the second escape hole. An escape sink 164 is formed between the inner circle of the annular support surface 163 and the wall surface of the second escape hole. A second annular space is formed between the outer periphery of the end of the motor drive shaft 212 facing away from the planetary assembly 70 and the inner periphery of the annular boss 162. The drive system also includes a second bearing structure 40, which is located in the second annular space and supported on the annular support surface 163. This ensures the smooth rotation of the motor drive shaft 212 and the reliability of power transmission.

[0056] like Figure 4 and Figure 5 As shown, in the radial direction of the motor housing 10, the first sub-accommodating chamber 115 includes, from the outside to the inside, the connected first sub-annular chamber 111, the second sub-annular chamber, and the central chamber; the motor assembly 20 includes a motor drive shaft 212, a rotor structure 213, an annular oil baffle plate 215 and a stator structure 211, wherein a portion of the motor drive shaft 212 is rotatably arranged in the central chamber, and the shaft section of the motor drive shaft 212 provided with the sun gear 214 extends into the second sub-accommodating chamber 116; the rotor structure 213 is sleeved on the outer peripheral side of the motor drive shaft 212 and is located in the second sub-annular chamber; the annular oil baffle plate 215 is sleeved on the outer peripheral side of the rotor structure 213 and is located at the boundary between the second sub-annular chamber and the first sub-annular chamber 111; the stator structure 211 is sleeved on the outer peripheral side of the annular oil baffle plate 215, and the stator structure 211 is located in the first sub-annular chamber 111. In this way, the installation reliability of the motor assembly 20 and the planetary assembly 70 is ensured. In addition, the provision of the annular oil baffle 215 is beneficial to preventing the lubricating oil in the first sub-annular cavity 111 from flowing into the second sub-annular cavity.

[0057] like Figure 4 and Figure 5As shown, in the radial direction of the motor housing 10, the first sub-accommodating cavity 115 includes, from the outside to the inside, the first sub-annular cavity 111, the second sub-annular cavity, and the central cavity that are connected to each other; the motor assembly 20 includes a motor drive shaft 212, a rotor structure 213, an annular oil baffle 215 and a stator structure 211, wherein a portion of the motor drive shaft 212 is rotatably arranged in the central cavity, and the shaft section of the motor drive shaft 212 with the sun gear 214 is extended into the second sub-accommodating cavity 116; the rotor structure 213 is sleeved on the outer peripheral side of the motor drive shaft 212, and Located in the second sub-annular cavity; the annular oil baffle 215 is sleeved on the outer peripheral side of the rotor structure 213 and is located at the boundary between the second sub-annular cavity and the first sub-annular cavity 111; the stator structure 211 is sleeved on the outer peripheral side of the annular oil baffle 215, and the stator structure 211 is located in the first sub-annular cavity 111; in the axial direction of the motor drive shaft 212, the axial height of the rotor structure 213 is less than the axial height of the stator structure 211, so that the rotor end face of the rotor structure 213 facing the planetary assembly 70 is at least lower than the stator end face of the stator structure 211 facing the planetary assembly 70 The sub-cavity structure 18 includes a column 182, a first annular support plate 185 and a second annular support plate 186, wherein a portion of the end surface of the column 182 facing the second sub-accommodating chamber 116 is recessed to form a limiting ring groove, and a third avoidance hole 181 is provided on the bottom surface of the limiting ring groove. A fourth annular space is formed between the groove wall surface of the limiting ring groove and the outer peripheral surface of the first planetary shaft segment 7111. The drive system also includes a fourth bearing structure 184, which is located in the fourth annular space; the first annular support plate 185 is sleeved on the column 182 The outer peripheral side of the column 182 is provided with a stop protrusion 1851 on the surface of the first annular support plate 185 facing the first sub-accommodating cavity 115. The first annular support plate 185 located on the outer peripheral side of the stop protrusion 1851 overlaps the support boss 141, and the stop protrusion 1851 abuts and cooperates with the support boss 141. The second annular support plate 186 is sleeved on the outer peripheral side of the column 182, and the second annular support plate 186 is located below the first annular support plate 185. The outer peripheral surface of the second annular support plate 186 abuts and cooperates with the inner peripheral surface of the annular oil baffle 215. In this way, the installation reliability of the motor assembly 20 and the planetary assembly 70 is ensured. In addition, the provision of the annular oil baffle 215 is conducive to preventing the lubricating oil in the first sub-annular cavity 111 from flowing into the second sub-annular cavity.

[0058] like Figure 4As shown, the motor housing 10 has an oil passage 13. The drive system also includes a pump structure 30, which is located at the end of the motor housing 10 facing away from the first avoidance hole 12. The pump structure 30 has an oil storage chamber and an oil return chamber connected to each other. The oil storage chamber is connected to the oil passage inlet of the oil passage 13. The first oil passage outlet 131 of the oil passage 13 is connected to the first annular space to lubricate and cool the first bearing structure 122. The first annular space is connected to the oil return chamber. This ensures the reliability of the lubricating oil in lubricating and cooling the first bearing structure 122.

[0059] like Figure 4 As shown, the oil passage 13 includes a first channel section 133 and a second channel section 134; the cylinder structure 14 has the first channel section 133, and the first end of the first channel section 133 is connected to the oil storage chamber, and the second end of the first channel section 133 extends along the axial direction of the cylinder structure 14 to the second channel section 134 and is connected to the second channel section 134; the second axial end of the top cover plate 15 has the second channel section 134, and the second channel section 134 extends around the circumference of the top cover plate 15; the bottom The lower cover plate 16 is provided with an oil outlet 166 and an oil return port. The oil outlet 166 is used to connect the first channel section 133 and the oil storage chamber. The top cover plate 15 also has a transition oil section 151. The first end of the transition oil section 151 is connected to the second channel section 134. The second end of the transition oil section 151 extends upward along the axis of the top cover plate 15 and penetrates the wall surface of the first avoidance hole 12 to form the first oil channel outlet 131. The first annular space is connected to the oil return chamber through the oil return port. In this way, by configuring the oil passage 13 to include the first channel section 133 and the second channel section 134, the space of the drive system can be fully utilized while ensuring the reliability of pumping the lubricating oil to the area requiring cooling and lubrication.

[0060] like Figure 4As shown, the motor housing 10 has an oil passage 13; the drive system also includes a pump body structure 30, which is arranged at one end of the motor housing 10 away from the first avoidance hole 12, and the pump body structure 30 has an oil storage chamber and an oil return chamber that are connected, and the oil storage chamber is connected to the oil passage inlet of the oil passage 13; wherein, a first communicating hole 1411 is opened on the support boss 141, a second communicating hole 1852 is opened at a position opposite to the first communicating hole 1411, and the second sub-accommodating chamber 11 is provided with a plurality of connecting holes 1852, and the connecting holes 1853 are connected to each other. The oil passage 13 is connected to the first sub-annular cavity 111 through the first communicating hole 1411 and the second communicating hole 1852, and the first sub-annular cavity 111 is connected to the oil return cavity. The second oil passage outlet 132 of the oil passage 13 is connected to the second sub-accommodating cavity 116, thereby lubricating and cooling the planetary gears 72 and the ring gear structure 114 located in the second sub-accommodating cavity 116, and cooling the stator structure 211 located in the first sub-annular cavity 111. The stator structure 211 has a stator gap, which is connected to the first sub-annular cavity 111. This ensures reliable cooling of the stator structure 211 by the lubricating oil. In addition, the lubricating oil after heat exchange can flow back to the oil return cavity under the action of its own gravity, thus forming a lubricating oil circulation loop.

[0061] like Figure 4 As shown, the oil passage 13 includes a first channel section 133 and a second channel section 134. The cylinder structure 14 has the first channel section 133, and the first end of the first channel section 133 is connected to the oil storage chamber. The second end of the first channel section 133 extends axially along the cylinder structure 14 to the second channel section 134 and is connected to the second channel section 134. The top cover plate 15 has a second channel section 134 at the second axial end, and the second channel section 134 extends circumferentially around the top cover plate 15. The bottom cover plate 16 is provided with an oil outlet 166 and an oil return port. The oil outlet 166 is used to connect the first channel section 133 and the oil storage chamber. The second oil passage outlet 132 is provided on the inner ring side channel wall of the second channel section 134. The first sub-annular cavity 111 is connected to the oil return chamber through the oil return port. This ensures that the lubricating oil can reliably cool the stator structure 211. In addition, the lubricating oil after heat exchange can flow back into the oil return chamber under its own gravity, thus forming a lubricating oil circulation loop.

[0062] like Figure 4As shown, the motor housing 10 has an oil passage 13; the drive system also includes a pump body structure 30, which is arranged at one end of the motor housing 10 away from the first avoidance hole 12, and the pump body structure 30 has an oil storage chamber and an oil return chamber that are connected, and the oil storage chamber is connected to the oil passage inlet of the oil passage 13; wherein, the first oil passage outlet 131 of the oil passage 13 is connected to the first annular space to lubricate and cool the first bearing structure 122, and the first annular space is connected to the oil return chamber; a first communicating hole 1411 is opened on the support boss 141, and the first annular support plate 185 is connected to the first communicating hole 14 A second connecting hole 1852 is provided at a position opposite to the first sub-annular cavity 11. The second sub-accommodating chamber 116 is connected to the first sub-annular cavity 111 through the first connecting hole 1411 and the second connecting hole 1852, and the first sub-annular cavity 111 is connected to the oil return cavity. The second oil passage outlet 132 of the oil passage 13 is connected to the second sub-accommodating chamber 116 to lubricate and cool the planetary gear 72 and the ring gear structure 114 located in the second sub-accommodating chamber 116, as well as to cool the stator structure 211 located in the first sub-annular cavity 111. The stator structure 211 has a stator gap, which is connected to the first sub-annular cavity 111. In this way, the cooling of the first bearing structure 122 by the lubricating oil is ensured to be reliable. In addition, the lubricating oil after heat exchange can flow back to the oil return cavity under the action of its own gravity, thereby forming a circulation loop for the lubricating oil.

[0063] like Figure 4 and Figure 5 As shown, the oil passage 13 includes a first channel section 133 and a second channel section 134; the cylinder structure 14 has a first channel section 133, and the first end of the first channel section 133 is connected to the oil storage chamber, and the second end of the first channel section 133 extends along the axial direction of the cylinder structure 14 to the second channel section 134 and is connected to the second channel section 134; the second axial end of the top cover plate 15 has a second channel section 134, and the second channel section 134 extends around the circumference of the top cover plate 15; the bottom cover plate 16 is provided with an oil outlet 166 and an oil return port, and the oil outlet 166 is provided with an oil return port. 66 is used to connect the first channel section 133 and the oil storage chamber. The top cover plate 15 also has a transition oil section 151. The first end of the transition oil section 151 is connected to the second channel section 134. The second end of the transition oil section 151 extends upward along the axis of the top cover plate 15 and penetrates the wall surface of the first avoidance hole 12 to form a first oil channel outlet 131. The first annular space is connected to the oil return chamber through the oil return port. The second channel section 134 has a second oil channel outlet 132 on the inner ring side of the channel wall. The first sub-annular cavity 111 is connected to the oil return chamber through the oil return port. In this way, the lubricating oil flowing out of the first oil channel outlet 131 is used to ensure the cooling reliability of the first bearing structure 122 and the stator structure 211.

[0064] like Figure 4As shown, the top cover plate 15 further has a first axial communication hole 154. The first end of the first axial communication hole 154 communicates with the transition oil section 151, and the second end of the first axial communication hole 154 communicates with the third annular space to lubricate and cool the third bearing structure 722. This ensures reliable lubrication and cooling of the third bearing structure 722 by the lubricating oil.

[0065] Optionally, the first channel segment 133 is a first annular channel segment.

[0066] Preferably, the first channel section 133 is a first strip-shaped channel section, and there are multiple first strip-shaped channel sections, which are arranged at intervals around the circumference of the cylindrical structure 14. In this way, the arrangement of the first strip-shaped channel sections guides the lubricating oil and ensures the accuracy of the flow direction of the lubricating oil.

[0067] Optionally, the transition oil section 151 is a second annular channel section.

[0068] Preferably, the transition oil section 151 is a second strip-shaped channel section, and there are multiple second strip-shaped channel sections, which are spaced apart around the circumference of the top cover plate 15. In this way, the provision of the second strip-shaped channel sections guides the lubricating oil and ensures the accuracy of the flow direction of the lubricating oil.

[0069] Furthermore, if Figure 1 and Figure 4 As shown, a reinforcing rib 153 is provided on the top cover plate 15 , and the above-mentioned transition oil section 151 is opened on the reinforcing rib 153 , and the transition oil section 151 is a second strip-shaped channel section.

[0070] Preferably, there are three reinforcing ribs 153 and three corresponding second strip-shaped channel sections.

[0071] like Figure 4 As shown, the top cover plate 15 further includes a communication ring segment 152. The inner ring side of the communication ring segment 152 communicates with the first annular space, and the outer ring side of the communication ring segment 152 communicates with the second sub-accommodation cavity 116, thereby connecting the first annular space and the second sub-accommodation cavity 116. In this way, the reliability of the communication between the first annular space and the second sub-accommodation cavity 116 is ensured.

[0072] Furthermore, if Figure 4As shown, the planetary gear shaft 7115 has a second axial communication hole 7116 that passes through both axial ends of the planetary gear shaft 7115. A first radial communication hole 7117 is defined in the wall of the second axial communication hole 7116. The first radial communication hole 7117 passes through the outer circumference of the planetary gear shaft 7115 and communicates with the third annular space. The first axial communication hole 154 is disposed opposite and communicates with the second axial communication hole 7116. This ensures reliable lubrication and cooling of the third bearing structure 722 by the lubricating oil.

[0073] like Figure 4 As shown, the second axial communication hole 7116 communicates with the fourth annular space to lubricate and cool the fourth bearing structure 184. A second radial communication hole 1821 is formed in the wall of the retaining ring groove. The second radial communication hole 1821 passes through the outer circumference of the cylinder 182 and communicates with the first sub-annular cavity 111. This ensures reliable lubrication and cooling of the fourth bearing structure 184 by the lubricating oil.

[0074] like Figure 4 and Figure 5 As shown, the first planetary shaft segment 7111 has an annular retaining groove 7118, the bottom of which extends to the second planetary shaft segment 7112. A fifth annular space is formed between the wall of the annular retaining groove 7118 and the outer circumference of the motor drive shaft 212. The drive system also includes a fifth bearing structure 80, which is located within the fifth annular space. The fourth annular space communicates with the fifth annular space to lubricate and cool the fifth bearing structure 80. This ensures reliable lubrication and cooling of the fifth bearing structure 80 by the lubricating oil.

[0075] like Figure 4 and Figure 5 As shown, the planetary carrier body 711 has a through hole, which passes through at least the end face of the planetary carrier body 711 facing one end of the motor assembly 20, so that the end of the motor drive shaft 212 having the sun gear 214 extends into the through hole, and the annular area for installing the planetary gear 72 is connected to the through hole; the motor drive shaft 212 has a fourth avoidance hole 2121, and the fourth avoidance hole 2121 passes through the axial ends of the motor drive shaft 212; the planetary carrier 71 also includes a through shaft 712, the first end of the through shaft 712 is extended into the through hole, and the second end of the through hole passes through the fourth avoidance hole 2121 and the second avoidance hole and is driven and connected to the pump body structure 30.

[0076] like Figure 4 and Figure 5As shown, the pump body structure 30 includes a rotor pump housing 31, which has an oil storage chamber and an oil return chamber. The rotor pump housing 31 is located at the end of the motor housing 10 that is away from the first avoidance hole 12. The rotor pump housing 31 has a sixth avoidance hole at the end away from the motor housing 10. An eighth avoidance hole is defined in the first mounting area opposite the seventh avoidance hole of the motor controller 60. The second end of the through-shaft 712 passes through the sixth avoidance hole, the seventh avoidance hole, and the eighth avoidance hole in sequence and is connected to the fan 52. This ensures the reliability of the through-shaft 712's drive of the fan 52, eliminating the need for additional drive structures.

[0077] like Figure 4 As shown, the outer circumference of the motor housing 10 is provided with a plurality of first heat sinks 17, which are radially spaced around the circumference of the motor housing 10; and / or the outer circumference of the rotor pump housing 31 of the pump body structure 30 is provided with a plurality of second heat sinks, which are radially spaced around the circumference of the rotor pump housing 31. In this way, due to Figure 4 The drive system is installed vertically. When the drive system rises with the low-altitude aircraft, the outside air flows through the first heat sink 17, so that the outside air flowing through the first heat sink 17 can take away the heat on the first heat sink 17, thereby exchanging heat with the higher temperature lubricating oil flowing through the first channel section 133, forming a cooling circuit for the lubricating oil, and ensuring the thermal balance of the drive system.

[0078] The beneficial effects of this application are as follows:

[0079] 1) By connecting a planetary gear system with a speed ratio of approximately 8.1, the electric drive system's power is output through the planetary carrier. The addition of a planetary gear reduction device significantly improves system efficiency, fully utilizes the high speed characteristics of the motor, and reduces system size. The planetary gear adopts a helical gear design, which improves gear strength and provides better NVH performance.

[0080] 2) Through the oil channel design of the rotor pump and the motor housing, the lubricating oil output by the rotor pump flows to the corresponding oil channels, respectively forcing lubrication and cooling of the planetary gear system, bearings and motor stator. Through oil spray lubrication, the system life can be significantly improved, and the motor stator can be quickly cooled, thereby improving the reliability and efficiency of the system and achieving greater torque and higher power output. At the same time, the rotor pump shaft is fixedly connected to the planetary carrier, and the rotor pump is driven by the power of the planetary carrier. No external power input is required, simplifying the system structure.

[0081] 3) The lubricating oil circulation circuit is designed to cool the lubricating oil. The lubricating oil output from the rotor pump flows through the inner wall pipe of the housing, where it contacts the heat sink of the outer housing for convection cooling. After cooling, the lubricating oil enters the gears, bearings, and motor stator inside the electric drive system. In addition, the fan in the bottom housing of the motor rotates to cool the lubricating oil in the motor controller and oil pan, further cooling the system's lubricating oil and improving its cooling efficiency.

[0082] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0083] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0084] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0085] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0086] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A drive system with a heat dissipation structure, characterized in that: Used to connect to the propeller drive of a low-altitude aircraft, the drive system includes: A motor housing (10), the motor housing (10) having an accommodating cavity (11) and a first avoidance hole (12) communicating with the accommodating cavity (11), and the motor housing (10) having an oil passage (13); A motor assembly (20), the motor assembly (20) being arranged in the accommodating cavity (11), and the motor assembly (20) comprising a motor drive shaft (212) and a sun gear (214), the sun gear (214) being sleeved on the outer circumference of the motor drive shaft (212), and a ring gear structure (114) being provided on a cavity wall surface of the accommodating cavity (11) opposite to the sun gear (214); A planetary assembly (70), the planetary assembly (70) comprising: a planetary carrier (71), wherein at least a portion of one axial end of the planetary carrier (71) is covered on the outer circumference of the motor drive shaft (212), and the other axial end of the planetary carrier (71) passes through the first avoidance hole (12) for driving connection with the propeller; a planetary gear (72), the planetary gear (72) being rotatably disposed on the planetary carrier (71) and simultaneously being in external meshing engagement with both the sun gear (214) and the ring gear structure (114); The drive system further comprises: A pump body structure (30), the pump body structure (30) being arranged at an end of the motor housing (10) away from the first avoidance hole (12), the pump body structure (30) having an oil storage chamber and an oil return chamber that are connected to each other, the oil storage chamber being in communication with an oil passage inlet of the oil passage (13); wherein a first annular space is formed between a portion of the outer peripheral surface of the planet carrier (71) located in the first avoidance hole (12) and a portion of the hole wall surface of the first avoidance hole (12); the first annular space is used to accommodate the first bearing structure (122); a first oil passage outlet (131) of the oil passage (13) is communicated with the first annular space to lubricate and cool the first bearing structure (122); and the first annular space is communicated with the oil return chamber; and / or, The motor assembly (20) further comprises a stator structure (211), the accommodating cavity (11) comprises a first sub-annular cavity (111) and a second sub-accommodating cavity (116), the stator structure (211) is located in the first sub-annular cavity (111), at least the planetary gear (72) and the ring gear structure (114) are located in the second sub-accommodating cavity (116), and the second sub-accommodating cavity (116) is communicated with the first sub-annular cavity (111), the second oil passage outlet (132) of the oil passage (13) is communicated with the second sub-accommodating cavity (116), so as to lubricate and cool the planetary gear (72) and the ring gear structure (114) located in the second sub-accommodating cavity (116), and to cool the stator structure (211) located in the first sub-annular cavity (111), and the first sub-annular cavity (111) is communicated with the oil return cavity; A heat dissipation structure (50) is provided at an axial end of the pump body structure (30) away from the motor housing (10) to dissipate heat from lubricating oil in the oil storage chamber and / or the oil return chamber.

2. The drive system according to claim 1, characterized in that The heat dissipation structure (50) is detachably connected to the pump body structure (30).

3. The drive system according to claim 1, characterized in that The motor housing (10) and the motor assembly (20) are arranged concentrically; and / or, The motor assembly (20) is concentrically arranged with the pump structure (30); and / or, The heat dissipation structure (50) is arranged concentrically with the pump body structure (30).

4. The drive system according to claim 1, characterized in that The heat dissipation structure (50) comprises: a heat dissipation housing (51), the heat dissipation housing (51) having a receiving groove (511), and the notch of the receiving groove (511) faces one side of the pump body structure (30), so that an installation space is formed between a groove wall surface of the receiving groove (511) and an end surface of the rotor pump housing (31) of the pump body structure (30) facing away from the motor housing (10); The drive system further comprises: A motor controller (60) is arranged in the installation space and is control-connected to the motor assembly (20).

5. The drive system according to claim 4, characterized in that: The heat dissipation housing (51) has a first installation area and a second installation area on an end surface facing away from the pump body structure (30), and the second installation area is located on the outer periphery of the first installation area; The heat dissipation structure (50) further includes: a fan (52), the fan (52) being rotatably disposed at the first installation area; There are multiple heat dissipation fins (53), and the multiple heat dissipation fins (53) are radially arranged in the second installation area.

6. The drive system according to claim 5, characterized in that: The number of blades of the fan (52) is smaller than the number of the heat dissipation fins (53).

7. The drive system according to claim 5, characterized in that: The length of the heat dissipation fins (53) in the radial direction of the heat dissipation housing (51) is greater than the length of the blades of the fan (52) in the radial direction of the heat dissipation housing (51).

8. The drive system according to claim 1, characterized in that The planet carrier (71) comprises: a planetary carrier body (711), wherein the planetary carrier body (711) comprises a first planetary shaft segment (7111), a second planetary shaft segment (7112), a third planetary shaft segment (7113), and a fourth planetary shaft segment (7114) connected in sequence in a direction away from the motor assembly (20); The outer diameter D1 of the first planetary shaft segment (7111), the outer diameter D2 of the second planetary shaft segment (7112), the outer diameter D3 of the third planetary shaft segment (7113), and the outer diameter D4 of the fourth planetary shaft segment (7114) satisfy the following relationship: D1=D4<D3<D2, and the planetary gear (72) is rotatably arranged at the second planetary shaft segment (7112).

9. The drive system according to claim 8, characterized in that: The second planetary shaft section (7112) has a plurality of planetary gear shafts (7115), and the plurality of planetary gear shafts (7115) are arranged at intervals around the circumference of the second planetary shaft section (7112). There are a plurality of planetary wheels (72), and the plurality of planetary wheels (72) correspond to the plurality of planetary gear shafts (7115) one by one. Each of the planetary wheels (72) is sleeved on the outer circumference of each corresponding planetary gear shaft (7115); A third annular space is formed between the outer circumference of the planetary gear shaft (7115) and the inner circumference of the planetary gear (72), and the drive system also includes a third bearing structure, which is located in the third annular space.

10. The driving system according to claim 8, characterized in that The motor housing (10) comprises: A cylindrical structure (14), both axial ends of the cylindrical structure (14) are open, and the cylindrical structure (14) has the accommodating cavity (11); A top cover plate (15), the top cover plate (15) is provided on the first axial end of the cylindrical structure (14), and the first axial end of the top cover plate (15) has the first avoidance hole (12); A bottom cover plate (16), the bottom cover plate (16) being arranged to cover the second axial end of the cylindrical structure (14); The cylindrical wall surface of the cylindrical structure (14), the top wall surface of the top cover plate (15) facing the cylindrical structure (14), and the bottom wall surface of the bottom cover plate (16) facing the cylindrical structure (14) form the accommodating cavity (11), and a supporting boss (141) is protruding from the cylindrical wall surface; a chamber dividing structure (18), the chamber dividing structure (18) being overlapped on the supporting boss (141) to divide the accommodating chamber (11) into a first sub-accommodating chamber (115) and a second sub-accommodating chamber (116); the chamber dividing structure (18) having a third avoidance through hole (181); a first end of the motor drive shaft (212) being located in the first sub-accommodating chamber (115); and a second end of the motor drive shaft (212) passing through the first avoidance through hole (12) and extending into the second sub-accommodating chamber (116); The cavity wall surface of the second sub-accommodating cavity (116) is provided with the gear ring structure (114); the first planetary shaft segment (7111) and the second planetary shaft segment (7112) are both located in the second sub-accommodating cavity (116); and portions of the third planetary shaft segment (7113) and the fourth planetary shaft segment (7114) are both located at the first avoidance hole (12); A first annular space is formed between the outer peripheral surface of the third planetary shaft segment (7113) and the wall surface of the first avoidance hole (12), and the drive system further includes a first bearing structure (122), and the first bearing structure (122) is located in the first annular space; An oil seal structure (123) is sandwiched between a portion of the outer circumferential surface of the fourth planetary shaft segment (7114) and the wall surface of the first avoidance hole (12), and the end of the fourth planetary shaft segment (7114) away from the third planetary shaft segment (7113) extends out of the first avoidance hole (12).

11. The drive system according to claim 10, characterized in that: A second avoidance hole is formed at one end of the bottom cover plate (16) away from the first avoidance hole (12); an annular boss (162) is provided around the outer periphery of the second avoidance hole, so as to form an annular support surface (163) between the inner circle of the annular boss (162) and the hole wall surface of the second avoidance hole, and an avoidance sink (164) is formed between the inner circle of the annular support surface (163) and the hole wall surface of the second avoidance hole; A second annular space is formed between the outer peripheral surface of the motor drive shaft (212) at one end facing away from the planetary assembly (70) and the inner peripheral surface of the annular boss (162); The drive system further comprises: A second bearing structure (40) is located in the second annular space and is supported on the annular support surface (163).

12. The drive system according to claim 10, characterized in that In the radial direction of the motor housing (10), the first sub-accommodating cavity (115) includes, from the outside to the inside, a first sub-annular cavity (111), a second sub-annular cavity, and a central cavity that are connected to each other; The motor assembly (20) comprises: The motor drive shaft (212), a portion of the motor drive shaft (212) is rotatably disposed in the central cavity, and a shaft section of the motor drive shaft (212) sleeved with the sun gear (214) extends into the second sub-accommodating cavity (116); a rotor structure (213), the rotor structure (213) being sleeved on the outer circumference of the motor drive shaft (212) and located in the second sub-annular cavity; an annular oil baffle (215), the annular oil baffle (215) being sleeved on the outer circumference of the rotor structure (213) and located at the boundary between the second sub-annular cavity and the first sub-annular cavity (111); A stator structure (211), wherein the stator structure (211) is sleeved on the outer peripheral side of the annular oil baffle (215), and the stator structure (211) is located in the first sub-annular cavity (111).

13. The driving system according to claim 11, characterized in that The planet carrier body (711) has a through hole, and the through hole penetrates at least the end surface of the planet carrier body (711) facing the motor assembly (20), so that the end of the motor drive shaft (212) having the sun gear (214) extends into the through hole, and the annular area for mounting the planet gear (72) is connected to the through hole; The motor drive shaft (212) has a fourth avoidance through hole (2121), and the fourth avoidance through hole (2121) passes through both axial ends of the motor drive shaft (212); The planet carrier (71) further comprises: A through shaft (712), wherein the first end of the through shaft (712) extends into the through hole, and the second end of the through shaft (712) passes through the fourth avoidance hole (2121) and the second avoidance hole and is drivingly connected to the pump body structure (30).

14. The drive system according to claim 13, wherein: The pump body structure (30) comprises: A rotor pump housing (31), the rotor pump housing (31) having the oil storage chamber and the oil return chamber, the rotor pump housing (31) being arranged at an end of the motor housing (10) away from the first avoidance hole (12), and the end of the rotor pump housing (31) away from the motor housing (10) having a sixth avoidance hole; An eighth avoidance through hole is provided at a position of the first installation area opposite to the seventh avoidance through hole of the motor controller (60); The second end of the through shaft (712) sequentially passes through the sixth avoidance hole, the seventh avoidance hole, and the eighth avoidance hole and is drivingly connected to the fan (52).

15. The drive system according to any one of claims 1 to 14, characterized in that: The outer peripheral surface of the motor housing (10) is provided with a plurality of first heat sinks (17), and the plurality of first heat sinks (17) are radially arranged at intervals around the circumference of the motor housing (10); and / or, The outer peripheral surface of the rotor pump housing (31) of the pump body structure (30) is provided with a plurality of second cooling fins, and the plurality of second cooling fins are radially arranged at intervals around the circumference of the rotor pump housing (31).

16. A low-altitude aircraft, characterized in that: The invention comprises a drive system and a propeller, wherein the drive system is drivingly connected to the propeller, and the drive system is the drive system according to any one of claims 1 to 15.

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