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 pump body structure and the heat dissipation structure, the motor shell is provided with a containing cavity, a first avoiding via hole and an oil passing channel; the end, away from the driving part, of the transmission part of the motor assembly penetrates through the first avoiding via hole to be in driving connection with a propeller; a first oil passage outlet of the oil passage is communicated with the first annular space so as to lubricate and cool the first bearing structure, and the first annular space is communicated with the oil return cavity; and / or, a second oil channel outlet of the oil passing channel communicates with the first sub-ring cavity, and the first sub-ring cavity communicates with the oil return cavity; the heat dissipation structure is arranged at the axial end, away from the motor shell, of the pump body structure and used for dissipating heat of lubricating oil in the oil storage cavity and / or the oil return cavity. According to the utility model, the problem that heat on the stator and / or the bearing cannot be effectively taken away because the lubricating oil after heat exchange is always in a high-temperature state in the prior art is solved.

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 (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

[0005] The main purpose of the present invention 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 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.

[0006] 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 being connected to the propeller drive of a low-altitude aircraft, the drive system comprising a motor housing, a motor assembly, a pump body structure and a heat dissipation structure, wherein the motor housing has a accommodating cavity and a first avoidance through-hole connected to the accommodating cavity; the motor housing also has an oil passage; the motor assembly comprises a driving part and a transmission part, at least part of the driving part is arranged in the accommodating cavity, the driving part is connected to the transmission part by driving, and an end of the transmission part away from the driving part passes through the first avoidance through-hole for being connected to the propeller drive; the pump body structure is arranged at an 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 and the oil passage are connected by oil. The inlet of the oil passage is connected; wherein, a first annular space is formed between a part of the outer circumferential surface of the transmission part located in the first avoidance hole and a part of the hole wall surface of the first avoidance hole, and the first annular space is used to accommodate the first bearing structure, and the first oil passage outlet of the oil passage 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 driving part includes a stator structure, the accommodating cavity has a first sub-annular cavity, the stator structure is located in the first sub-annular cavity, the second oil passage outlet of the oil passage is connected to the first sub-annular cavity to cool the stator structure, and the first sub-annular cavity is connected to the oil return chamber; the heat dissipation structure is arranged at an axial end of the pump body structure away from the motor housing, so as to dissipate heat from the lubricating oil in the oil storage cavity and / or the oil return cavity.

[0007] Furthermore, the heat dissipation structure is detachably connected to the pump body structure.

[0008] 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.

[0009] 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 drive unit.

[0010] 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.

[0011] Furthermore, the number of fan blades is smaller than the number of heat dissipation fins.

[0012] 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.

[0013] Furthermore, the driving part includes a motor drive shaft, a rotor structure and a stator structure, wherein part of the motor drive shaft is rotatably arranged in the accommodating cavity, and another part of the motor drive shaft is extended into the first avoidance hole; the rotor structure is sleeved on the outer peripheral side of the motor drive shaft; the stator structure is sleeved on the outer peripheral side of the rotor structure, and the stator structure has a stator gap, which is connected to the first sub-annular cavity.

[0014] Furthermore, a second avoidance hole is provided at the end of the motor housing away from the first avoidance hole; the pump body structure includes a rotor pump housing and a rotor pump drive shaft, wherein the rotor pump housing 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 third avoidance hole; the rotor pump drive shaft includes a connected assembly shaft section and a transmission shaft section, and the shaft diameter of the assembly shaft section is larger than the shaft diameter of the transmission shaft section, so that a stop ring surface is formed at the connection between the assembly shaft section and the transmission shaft section, the assembly shaft section extends into the center hole of the motor drive shaft to be connected to the motor drive shaft, and the stop ring surface is flush with the end face of the motor drive shaft away from the flange connection shaft; a fifth avoidance hole is provided at a position opposite to the fourth avoidance hole of the motor controller in the first installation area; the end of the transmission shaft section away from the assembly shaft section passes through the second avoidance hole, the third avoidance hole, the fourth avoidance hole, and the fifth avoidance hole in sequence and is connected to the fan drive.

[0015] Furthermore, the outer peripheral surface of the 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.

[0016] 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.

[0017] By applying the technical solution of the present utility model, a drive system with a heat dissipation structure is provided, wherein the drive system includes a motor housing, a motor assembly, a pump body structure and a heat dissipation structure, wherein the motor housing has a accommodating cavity and a first avoidance hole connected to the accommodating cavity, and the motor housing also has an oil passage; the motor assembly includes a driving part and a transmission part, at least part of the driving part is arranged in the accommodating cavity, the driving part is drive-connected to the transmission part, and an end of the transmission part away from the driving part passes through the first avoidance hole for connection to the propeller drive; the pump body structure is arranged at an end of the motor housing away from the first avoidance 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 passage inlet of the oil passage; the heat dissipation structure is arranged at an axial end of the pump body structure away from the motor housing, so as to dissipate the heat of the lubricating oil in the oil storage chamber and / or the oil return chamber.

[0018] Furthermore, a first annular space is formed between a portion of the outer circumferential surface of the transmission part located in the first avoidance hole and a portion of the hole wall surface of the first avoidance hole, and the first annular space is used to accommodate the first bearing structure, and 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 return oil chamber; and / or, the driving part includes a stator structure, the accommodating chamber has a first sub-annular cavity, the stator structure is located in the first sub-annular cavity, the second oil channel outlet of the oil channel is connected to the first sub-annular cavity to cool the stator structure, and the first sub-annular cavity is connected to the return oil chamber.

[0019] The drive system provided in the present application is equipped with a pump body structure and an oil passage in the motor housing, so that the pump body structure can pump the lubricating oil in the oil storage chamber to the outlet of the first oil passage through the oil passage, so that the lubricating oil flows into the first annular space, thereby lubricating and cooling the first bearing structure in the first annular space. Finally, the lubricating oil after lubrication and heat exchange flows back to the return oil chamber.

[0020] Of course, the pump body structure can also pump the lubricating oil in the oil storage chamber to the outlet of the second oil channel through the oil passage, so that the lubricating oil flows into the first sub-annular cavity, thereby achieving the purpose of cooling the stator structure in the first sub-annular cavity. Finally, the lubricating oil after heat exchange flows back to the return oil chamber.

[0021] 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

[0022] 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:

[0023] 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;

[0024] Figure 2 Shown Figure 1 A schematic structural diagram of the other axial end of the drive system;

[0025] Figure 3 Shown Figure 1 A schematic diagram of the structure of the top cover of the drive system from a top view perspective;

[0026] Figure 4 Shown Figure 3 Schematic diagram of the cross-sectional structure at AA in FIG;

[0027] Figure 5 Shown Figure 4 Schematic diagram of the decomposed structure of the drive system in .

[0028] The above drawings include the following reference numerals:

[0029] 10. Motor housing; 11. Accommodating cavity; 111. First sub-annular 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; 15. Top cover plate; 151. Transition oil section; 152. Connecting ring section; 153. Reinforcement rib; 16. Bottom cover plate; 162. Annular boss; 163. Annular support surface; 164. Avoidance sink; 17. First heat sink;

[0030] 20. Motor assembly; 21. Drive unit; 211. Stator structure; 212. Motor drive shaft; 213. Rotor structure; 2131. Annular sink; 215. Annular oil baffle; 22. Transmission unit; 221. Flange connecting shaft; 2211. First shaft segment; 2212. Overlapping plate segment; 2213. Second shaft segment; 2214. Third shaft segment; 2215. Assembly hole;

[0031] 30. Pump body structure; 31. Rotor pump housing; 32. Rotor pump drive shaft; 321. Assembly shaft section; 322. Transmission shaft section; 33. Second heat sink;

[0032] 40. Second bearing structure;

[0033] 50. Heat dissipation structure; 51. Heat dissipation housing; 511. Accommodation slot; 52. Fan; 53. Heat dissipation fins;

[0034] 60. Motor controller. DETAILED DESCRIPTION

[0035] 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.

[0036] In order to solve the problem in the prior art that 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, and the drive system is connected to the propeller drive, and the drive system is the drive system mentioned above and described below.

[0037] like Figures 1 to 5As shown, a drive system with a heat dissipation structure is used to be connected to the propeller drive of a low-altitude aircraft. The drive system includes a motor housing 10, a motor assembly 20, a pump body structure 30 and a heat dissipation structure 50, wherein the motor housing 10 has a accommodating cavity 11 and a first avoidance hole 12 connected to the accommodating cavity 11; the motor housing 10 also has an oil passage 13; the motor assembly 20 includes a driving part 21 and a transmission part 22, at least part of the driving part 21 is arranged in the accommodating cavity 11, the driving part 21 is connected to the transmission part 22, and the end of the transmission part 22 away from the driving part 21 passes through the first avoidance hole 12 for connection to the propeller drive; the pump body structure 30 is arranged at the end of the motor housing 10 away from the first avoidance hole 12, 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 oil storage chamber is connected to the oil passage inlet of the oil passage 13; A first annular space is formed between a portion of the outer circumferential surface of the transmission part 22 in the 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 driving part 21 includes a stator structure 211, the accommodating cavity 11 has a first sub-annular cavity 111, the stator structure 211 is located in the first sub-annular cavity 111, the second oil channel outlet 132 of the oil channel 13 is connected to the first sub-annular cavity 111 to cool the stator structure 211, and the first sub-annular cavity 111 is connected to the return oil chamber; the heat dissipation structure 50 is arranged at the axial end of the pump body structure 30 away from the motor housing 10, for dissipating the heat of the lubricating oil in the oil storage cavity and / or the return oil cavity.

[0038] By applying the technical solution of the present utility model, a drive system with a heat dissipation structure is provided, the drive system includes a motor housing 10, a motor assembly 20, a pump body structure 30 and a heat dissipation structure 50, wherein the motor housing 10 has an accommodating cavity 11 and a first avoidance hole 12 connected to the accommodating cavity 11, and the motor housing 10 also has an oil passage 13; the motor assembly 20 includes a driving part 21 and a transmission part 22, at least part of the driving part 21 is arranged in the accommodating cavity 11, the driving part 21 is driven and connected to the transmission part 22, and the end of the transmission part 22 away from the driving part 21 passes through the first avoidance hole 12 for being connected to the propeller drive; the pump body structure 30 is arranged at the end of the motor housing 10 away from the first avoidance hole 12, 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; the heat dissipation structure 50 is arranged at the axial end of the pump body structure 30 away from the motor housing 10, for dissipating the heat of the lubricating oil in the oil storage chamber and / or the oil return chamber.

[0039] Furthermore, a first annular space is formed between a portion of the outer peripheral surface of the transmission part 22 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 driving part 21 includes a stator structure 211, the accommodating cavity 11 has a first sub-annular cavity 111, the stator structure 211 is located in the first sub-annular cavity 111, and the second oil channel outlet 132 of the oil channel 13 is connected to the first sub-annular cavity 111 to cool the stator structure 211, and the first sub-annular cavity 111 is connected to the return oil chamber.

[0040] The drive system provided in the present application is configured with a pump body structure 30 and an oil passage 13 in the motor housing 10, so that the pump body structure 30 can pump the lubricating oil in the oil storage chamber to the first oil passage outlet 131 through the oil passage 13, so that the lubricating oil flows into the first annular space, thereby lubricating and cooling the first bearing structure 122 in the first annular space, and finally the lubricating oil after lubrication and heat exchange flows back to the return oil chamber.

[0041] Of course, the pump body structure 30 can also pump the lubricating oil in the oil storage chamber to the second oil channel outlet 132 through the oil channel 13, so that the lubricating oil flows into the first sub-annular cavity 111, thereby achieving the purpose of cooling the stator structure 211 in the first sub-annular cavity 111, and finally the lubricating oil after heat exchange flows back to the return oil chamber.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] like Figure 4 and Figure 5As shown, the heat dissipation structure 50 includes a heat dissipation housing 51, which has a receiving groove 511. 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 drive unit 21. In this way, the installation reliability of the motor controller 60 is ensured. It also plays a protective role for the motor controller 60 and heat dissipation.

[0046] like Figure 4 As 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.

[0047] 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.

[0048] 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.

[0049] like Figure 4 As shown, the drive unit 21 includes a motor drive shaft 212, a rotor structure 213, and a stator structure 211. Part of the motor drive shaft 212 is rotatably disposed within the accommodating cavity 11, while another part of the motor drive shaft 212 extends into the first avoidance hole 12. The rotor structure 213 is sleeved around the outer periphery of the motor drive shaft 212. The stator structure 211 is sleeved around the outer periphery of the rotor structure 213. The stator structure 211 has a stator gap, which communicates with the first sub-annular cavity 111. This ensures that lubricating oil flowing through the stator gap can flow back into the oil return cavity under its own gravity after heat exchange.

[0050] like Figure 4As shown, a second avoidance hole is provided at one end of the motor housing 10 away from the first avoidance hole 12; the pump body structure 30 includes a rotor pump housing 31 and a rotor pump drive shaft 32, wherein the rotor pump housing 31 has an oil storage chamber and an oil return chamber, and the rotor pump housing 31 is arranged at one 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 has a third avoidance hole; the rotor pump drive shaft 32 includes an assembly shaft section and a transmission shaft section 322 connected to each other, and the shaft diameter of the assembly shaft section is larger than the shaft diameter of the transmission shaft section 322 , so that a stop ring is formed at the connection between the assembly shaft section and the drive shaft section 322. The assembly shaft section extends into the center hole of the motor drive shaft 212 to connect with the motor drive shaft 212, and the stop ring is flush with the end surface of the motor drive shaft 212 that faces away from the flange connection shaft. A fifth avoidance hole is defined at a position in the first mounting area opposite the fourth avoidance hole of the motor controller 60. The end of the drive shaft section 322 that faces away from the assembly shaft section passes through the second avoidance hole, the third avoidance hole, the fourth avoidance hole, and the fifth avoidance hole in sequence to be drivingly connected to the fan 52. In this way, the reliability of the drive shaft section 322 driving the fan 52 is ensured without the need for an additional drive structure for the fan 52.

[0051] like Figures 1 to 5 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 33, 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.

[0052] It should be noted that, in the present application, the first avoidance hole 12 is provided at the first axial end of the motor housing 10, and the pump body structure 30 is provided at the second axial end of the motor housing 10. In this way, the axial space of the drive system is fully utilized, thereby ensuring the overall compactness of the drive system.

[0053] Preferably, the motor housing 10 and the motor assembly 20 are arranged concentrically; and / or the motor assembly 20 and the pump body structure 30 are arranged concentrically. In this way, the force transmission reliability and power output reliability of the drive system provided by the present application are ensured.

[0054] It should be noted that Figure 4The schematic diagram of the drive system in the figure shows the vertical installation direction of the drive system, so that the lubricating oil pumped upward after heat exchange and lubrication can flow back to the oil return chamber under the action of its own gravity, ensuring the circulation of the lubricating oil.

[0055] It should be noted that, in an embodiment not shown in the figures of the present application, the oil passage 13 includes a first channel section 133 and a second channel section 134; the motor housing 10 includes a cylindrical structure 14, a top cover plate 15 and a bottom cover plate 16, wherein both axial ends of the cylindrical structure 14 are open, the cylindrical structure 14 has a first channel section 133, and the first end of the first channel section 133 is communicated with the oil storage chamber, the second end of the first channel section 133 extends along the axial direction of the cylindrical structure 14 to the second channel section 134 and is communicated with the second channel section 134; the top cover plate 15 is covered on 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 axial second end of the top cover plate 15 has a second channel section 134, and the second channel section 134 surrounds the top cover plate 15 circumferential extension; the bottom cover plate 16 is provided on the second axial end of the cylindrical structure 14, and an oil outlet and an oil return port are provided on the bottom cover plate 16, and the oil outlet is used to connect the first channel section 133 and the oil storage chamber; 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 chamber 11; when the first bearing structure 122 is lubricated and cooled, the top cover plate 15 also has a transition oil section 151, a first end of the transition oil section 151 is connected to the second channel section 134, and a second end of the transition oil section 151 extends obliquely upward along the axis close to the top cover plate 15 and passes through the hole wall surface of the first avoidance hole 12 to form a first oil channel outlet 131, and the first annular space is connected to the oil return chamber through the oil return port. In this way, the lubricating oil is pumped from the oil storage chamber to the first oil channel outlet 131, thereby achieving the purpose of lubricating and cooling the first bearing structure 122, and then flows back to the oil return chamber to form a circulation loop of the lubricating oil.

[0056] It should be noted that, in another embodiment of the present application not shown in the figure, the oil passage 13 includes a first channel section 133 and a second channel section 134; the motor housing 10 includes a cylindrical structure 14, a top cover plate 15 and a bottom cover plate 16, both axial ends of the cylindrical structure 14 are open, the cylindrical 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, the second end of the first channel section 133 extends along the axial direction of the cylindrical structure 14 to the second channel section 134, and is connected to the second channel section 134; the top cover plate 15 is provided on 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 top cover The second axial end of the plate 15 has a second channel section 134, which extends around the circumference of the top cover plate 15. The bottom cover plate 16 is provided on the second axial end of the cylindrical structure 14. The bottom cover plate 16 is provided with an oil outlet and an oil return port. The oil outlet is used to connect the first channel section 133 with the oil storage chamber. 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 chamber 11. When cooling the stator structure 211, a second oil channel outlet 132 is provided on the inner ring side channel wall of the second channel section 134, and the first sub-annular cavity 111 is connected to the oil return chamber through the oil return port. In this way, the lubricating oil is pumped from the oil storage chamber to the second oil channel outlet 132, thereby cooling the stator structure 211, and then flows back to the oil return chamber, forming a lubricating oil circulation loop.

[0057] like Figure 4 and Figure 5As shown, the oil passage 13 includes a first channel section 133 and a second channel section 134; the motor housing 10 includes a cylindrical structure 14, a top cover plate 15 and a bottom cover plate 16, wherein both axial ends of the cylindrical structure 14 are open, the cylindrical structure 14 has a first channel section 133, and the first end of the first channel section 133 is communicated with the oil storage chamber, the second end of the first channel section 133 extends along the axial direction of the cylindrical structure 14 to the second channel section 134 and is communicated with the second channel section 134; the top cover plate 15 is covered on 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, and the axial second 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 covered on the axial second end of the cylindrical structure 14, and an oil outlet is provided on the bottom cover plate 16 and an oil return port, the oil outlet is used to connect the first channel section 133 and the oil storage chamber; wherein, the cylinder wall surface of the cylinder structure 14, the top wall surface of the top cover plate 15 facing the cylinder structure 14 side, and the bottom wall surface of the bottom cover plate 16 facing the cylinder structure 14 side form an accommodating chamber 11; 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 close to the top cover plate 15 and passes through the hole wall surface of the first avoidance hole 12 to form a first oil channel outlet 131, and lubricates and cools the first bearing structure 122, and the first annular space is connected to the oil return chamber through the oil return port; a second oil channel outlet 132 is opened on the inner ring side channel wall of the second channel section 134 to cool the stator structure 211, and the first sub-annular cavity 111 is connected to the oil return chamber through the oil return port. In this way, it is ensured that the lubricating oil is pumped from the oil storage chamber to the first oil channel outlet 131, thereby achieving the purpose of lubricating and cooling the first bearing structure 122, and then flows back to the return oil chamber to form a circulation loop of the lubricating oil; and it is ensured that the lubricating oil is pumped from the oil storage chamber to the second oil channel outlet 132, thereby achieving the purpose of cooling the stator structure 211, and then flows back to the return oil chamber to form a circulation loop of the lubricating oil.

[0058] Optionally, the first channel segment 133 is a first annular channel segment.

[0059] 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.

[0060] Optionally, the transition oil section 151 is a second annular channel section.

[0061] 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.

[0062] Further, 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.

[0063] Preferably, there are three reinforcing ribs 153 and three corresponding second strip-shaped channel sections.

[0064] like Figure 4 As shown, the top cover plate 15 further has a communication ring segment 152. The inner ring side of the communication ring segment 152 is in communication with the first annular space, and the outer ring side of the communication ring segment 152 is in communication with the first sub-annular cavity 111, thereby connecting the first annular space and the first sub-annular cavity 111. In this way, the reliability of the communication between the first annular space and the first sub-annular cavity 111 is ensured.

[0065] like Figure 4 and Figure 5 As shown, in the radial direction of the motor housing 10, the accommodating cavity 11 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 driving portion 21 includes a motor driving shaft 212, a rotor structure 213, an annular oil baffle plate 215 and a stator structure 211, a part of the motor driving shaft 212 is rotatably arranged in the central cavity, and the other part of the motor driving shaft 212 is extended into the first avoidance hole 12; the rotor structure 213 is sleeved on the outer peripheral side of the motor driving shaft 212 and is located in the second sub-annular cavity; 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 cavity and the first sub-annular cavity 111; the stator structure 211 is sleeved on the rotor structure On the outer periphery of 213, the stator structure 211 has a stator gap, which is connected to the first sub-annular cavity 111. The transmission part 22 includes a flange connecting shaft 221. The flange connecting shaft 221 includes a first shaft segment 2211, a lap plate segment 2212, a second shaft segment 2213, and a third shaft segment 2214, which are connected in sequence in the direction away from the driving part 21. The flange connecting shaft 221 has an assembly hole 2215 on the surface of the flange connecting shaft 221 facing the driving part 21. The assembly hole 2215 passes through the first shaft segment 2211, the lap plate segment 2212, the second shaft segment 2213, and extends to the third shaft segment 2214. The motor drive shaft 212 extends into the assembly hole 2215 to be drivingly connected to the flange connecting shaft 221. This helps improve the space utilization of the drive system, thereby ensuring the overall compactness of the drive system.

[0066] Optionally, a spline or optical shaft interference fit is used between the motor drive shaft 212 and the flange connection shaft 221 to transmit torque, and the flange connection shaft 221 is connected to the propeller by screws to transmit the power of the drive unit 21 to the propeller of the low-altitude aircraft.

[0067] like Figure 4 and Figure 5 As shown, in the axial direction of the drive unit 21, the axial height of the rotor structure 213 is less than the axial height of the stator structure 211, so that at least the rotor end surface of the rotor structure 213 facing the flange connection shaft 221 is lower than the stator end surface of the stator structure 211 facing the flange connection shaft 221, so that the rotor end surface and the partial inner circumference of the stator structure 211 form an annular recessed platform 2131, the first shaft segment 2211 is located within the annular recessed platform 2131; the overlapping disc segment 2212 overlaps the stator end surface; a first annular space is formed between the outer circumference of the second shaft segment 2213 and the hole wall of the first avoidance hole 12; an oil seal structure 123 is sandwiched between the partial outer circumference of the third shaft segment 2214 and the hole wall of the first avoidance hole 12, and the end of the third shaft segment 2214 away from the second shaft segment 2213 extends out of the first avoidance hole 12. In this way, it is ensured that there is no interference between the various components of the drive system, and the movement reliability and transmission reliability of the various components are guaranteed.

[0068] Optionally, the outer diameter D1 of the first shaft segment 2211 , the outer diameter D2 of the overlapping plate segment 2212 , the outer diameter D3 of the second shaft segment 2213 , and the outer diameter D4 of the third shaft segment 2214 satisfy the following relationship: D4<D3<D1<D2.

[0069] like Figure 4As shown, a second avoidance hole is opened at one end of the motor housing 10 away from the first avoidance hole 12, and an annular boss 162 is provided around the outer periphery of the second avoidance hole to form an annular support surface 163 between the inner ring of the annular boss 162 and the hole wall of the second avoidance hole, and an avoidance sink 164 is formed between the inner ring of the annular support surface 163 and the hole wall of the second avoidance hole; the pump body structure 30 includes a rotor pump housing 31 and a rotor pump drive shaft 32, the rotor pump housing 31 has an oil storage chamber and an oil return chamber, and the rotor pump housing 31 is arranged at one end of the motor housing 10 away from the first avoidance hole 12; the rotor pump drive shaft 32 includes an assembly shaft section 321 and a transmission shaft section 322 connected to each other, and the assembly shaft The shaft diameter of segment 321 is larger than the shaft diameter of transmission shaft segment 322, so that a stop ring surface is formed at the connection between the assembly shaft segment 321 and the transmission shaft segment 322. The assembly shaft segment 321 extends into the center hole of the motor drive shaft 212 to connect with the motor drive shaft 212, and the stop ring surface is flush with the end face of the motor drive shaft 212 that faces away from the flange connection shaft 221, and is set at a distance from the avoidance sink 164. A second annular space is formed between the outer peripheral surface of the end of the motor drive shaft 212 that faces away from the flange connection shaft 221 and the inner peripheral surface 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. In this way, the reliability of the rotor pump drive shaft 32 of the drive system is ensured along with the rotation of the motor drive shaft 212.

[0070] Preferably, a second avoidance hole is formed at an end of the bottom cover plate 16 away from the first avoidance hole 12 .

[0071] like Figures 1 to 5 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 33, 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.

[0072] The beneficial effects of this application are as follows:

[0073] 1) 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 bearings and motor stators. Through oil spray lubrication, the bearing 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 motor rotor shaft, relying on the power of the motor rotor shaft to drive the rotor pump to work, without the need for external power input, simplifying the system structure and space;

[0074] 2) The lubricating oil output from the rotor pump flows through the inner wall pipe of the housing, where it comes into contact with the heat sink of the outer housing for convection cooling. After cooling, the lubricating oil enters the bearings and motor stator. 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 the system's cooling efficiency.

[0075] 3) The motor’s internal rotor output reduces motor design costs and facilitates system lubrication design.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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); the motor housing (10) also having an oil passage (13); A motor assembly (20), the motor assembly (20) comprising a driving portion (21) and a transmission portion (22), at least a portion of the driving portion (21) being disposed within the accommodating cavity (11), the driving portion (21) being drivingly connected to the transmission portion (22), and an end of the transmission portion (22) away from the driving portion (21) passing through the first avoidance hole (12) for driving connection with the propeller; 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 transmission portion (22) 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 driving portion (21) includes a stator structure (211), the accommodating cavity (11) has a first sub-annular cavity (111), the stator structure (211) is located in the first sub-annular cavity (111), the second oil passage outlet (132) of the oil passage (13) is in communication with the first sub-annular cavity (111) to cool the stator structure (211), and the first sub-annular cavity (111) is in communication 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 drive unit (21).

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 5, characterized in that The driving unit (21) includes: a motor drive shaft (212), wherein a portion of the motor drive shaft (212) is rotatably disposed in the accommodating cavity (11), and another portion of the motor drive shaft (212) is extended into the first avoidance hole (12); a rotor structure (213), wherein the rotor structure (213) is sleeved on the outer peripheral side of the motor drive shaft (212); The stator structure (211) is sleeved on the outer circumference of the rotor structure (213), and the stator structure (211) has a stator gap, which is communicated with the first sub-annular cavity (111).

9. The drive system according to claim 8, characterized in that: A second avoidance hole is formed at one end of the motor housing (10) away from the first avoidance hole (12); 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 one 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 third avoidance hole; A rotor pump drive shaft (32), the rotor pump drive shaft (32) comprising an assembly shaft section and a transmission shaft section (322) connected to each other, wherein the shaft diameter of the assembly shaft section is larger than the shaft diameter of the transmission shaft section (322), so that a stop ring surface is formed at the connection between the assembly shaft section and the transmission shaft section (322), the assembly shaft section extends into the central hole of the motor drive shaft (212) to be connected to the motor drive shaft (212), and the stop ring surface is flush with the end surface of the motor drive shaft (212) facing away from the flange connection shaft (221); A fifth avoidance through hole is provided at a position of the first installation area opposite to the fourth avoidance through hole of the motor controller (60); One end of the transmission shaft section (322) facing away from the assembly shaft section passes through the second avoidance hole, the third avoidance hole, the fourth avoidance hole, and the fifth avoidance hole in sequence and is drivingly connected to the fan (52).

10. The drive system according to any one of claims 1 to 9, 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, A plurality of second cooling fins (33) are provided on the outer peripheral surface of the rotor pump housing (31) of the pump body structure (30), and the plurality of second cooling fins (33) are radially arranged at intervals around the circumference of the rotor pump housing (31).

11. 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 10.

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