A wheel hub motor

Abstract

The application relates to the motor technical field, in particular to a wheel hub motor which comprises a stator support, a rotor base and a wheel hub shell; a rotating shaft is arranged in the stator support; the stator support is provided with an upper cavity, a middle cavity and a lower cavity; a liquid storage groove is arranged between the bottom of the lower cavity and the rotor base; a conduction assembly is arranged between the wheel hub shell and the stator support; and a driving assembly is arranged between the stator support and the rotor base. With the power of the self-rotation of the rotor base, the circumferential rotation of the rotor base is converted into the axial reciprocating motion of the annular piston through the cooperation between the driving pin on the rotor base and the driving groove at the bottom of the annular piston, the one-way conduction effect of the first one-way valve and the second one-way valve is matched, the oil suction from the liquid storage groove, the oil collection to the annular oil storage cavity and the oil supply process of pumping the lubricating oil from the driving pipe to the upper cavity are automatically completed, the whole cycle does not need to be configured with an additional oil pump and an external power source, and the manufacturing cost and the fault risk are effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a hub motor. Background Technology

[0002] As a core component integrating power and transmission functions inside the wheel hub, the in-wheel motor is widely used in electric vehicles, intelligent mobility devices and other fields. Its internal space is compact and its operating conditions are complex, requiring high lubrication performance and heat dissipation capacity.

[0003] Currently, most hub motors have independently designed lubrication and cooling systems, primarily using static grease lubrication. During long-term high-speed, high-load operation, the grease is prone to deterioration and loss due to high temperatures, leading to accelerated wear on bearings, transmission gears, and other moving parts. This not only requires frequent maintenance shutdowns but also shortens the overall lifespan of the motor. Regarding heat dissipation, most hub motors rely on natural heat dissipation from the casing. The efficiency of heat transfer from the motor's interior to the casing is low, and internal heat buildup can cause problems such as coil insulation aging and magnet demagnetization, directly affecting the motor's operating efficiency and reliability. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings of the prior art by providing a hub motor.

[0005] The objective of this invention is achieved through the following technical solution: a hub motor, comprising a stator support, a rotor seat rotatably disposed within the stator support, and a hub housing rotatably disposed outside the stator support; a transmission assembly is provided between the stator support and the hub housing; a rotating shaft is rotatably disposed within the stator support; the rotor seat is connected to the rotating shaft; the rotating shaft is drively connected to the hub housing through the transmission assembly;

[0006] The stator support is provided with an upper cavity, a middle cavity and a lower cavity in sequence along the axial direction in the middle part; an upper bearing is provided between one end of the rotating shaft and the upper cavity; a lower bearing is provided between the other end of the rotating shaft and the lower cavity; an outer cavity communicating with the middle cavity is formed between the outer wall of the stator support and the inner wall of the hub shell;

[0007] A liquid storage tank is provided between the bottom of the lower cavity and the rotor seat; a conductive assembly is provided between the hub shell and the stator support; the outer cavity is connected to the liquid storage tank through the conductive assembly; a drive assembly is provided between the stator support and the rotor seat; the drive assembly is used to transfer the lubricating oil from the liquid storage tank to the upper cavity.

[0008] The present invention is further configured such that the stator support, rotor seat, hub housing, rotating shaft, upper cavity, lower cavity, upper bearing and lower bearing are coaxially arranged.

[0009] The present invention is further configured such that the transmission component includes teeth disposed on the outer periphery of the rotating shaft, a gear rotatably disposed in the central cavity, and a gear ring disposed on the inner wall of the hub housing; the two ends of the gear respectively mesh with the gear ring and the teeth on the outer periphery of the rotating shaft.

[0010] The present invention is further configured such that the stator support is provided with an iron core and a coil; and the rotor seat is provided with a magnet.

[0011] The present invention is further configured such that the driving assembly includes an annular oil reservoir fixedly disposed at the bottom of the lower cavity and an annular piston that is movably and sealingly disposed at the bottom of the annular oil reservoir; an annular oil reservoir cavity is formed between the annular oil reservoir and the annular piston; the liquid storage tank is disposed on the inner side of the annular oil reservoir; and the inner wall of the annular oil reservoir is provided with a first one-way valve that opens toward the annular oil reservoir cavity.

[0012] The invention is further configured such that the bottom of the annular piston is provided with a driving groove; the rotor seat is provided with a driving pin; the driving pin is movably disposed in the driving groove; the driving groove includes a first driving arc groove, a first driving spiral groove, a second driving arc groove and a second driving spiral groove that are connected end to end along the circumferential direction; the depth of the first driving arc groove is greater than the depth of the second driving arc groove.

[0013] The present invention is further configured such that a positioning boss is provided in the middle of the rotor seat; the annular oil storage cover is sleeved on the positioning boss; the annular oil storage cover and the positioning boss are sealed and rotatably connected; the positioning boss protrudes into the liquid storage tank; and the outer wall of the positioning boss is provided with a flow guiding slope.

[0014] The present invention is further configured such that the driving assembly includes a driving tube embedded in the stator support; one end of the driving tube is connected to the annular oil storage chamber; the other end of the driving tube is connected to the upper cavity; the connection between the other end of the driving tube and the upper cavity is located at the top of the upper bearing; the lower bearing is located at the top of the liquid storage tank; and a second one-way valve that opens in the direction of the driving tube is provided between one end of the driving tube and the annular oil storage cover.

[0015] The present invention is further configured such that the conductive assembly includes a sliding ring that is slidably mounted on the inner wall of the hub housing; a reciprocating swing block is rotatably mounted on the inner wall of the sliding ring; a reciprocating spiral groove is provided on the outer wall of the stator support along the circumferential direction; and the reciprocating swing block is movably mounted in the reciprocating spiral groove.

[0016] The stator support has an annular conductive cover on its outer periphery at the bottom; the annular conductive cover has an annular conductive groove; the outer wall of the annular conductive cover is rotatably connected to the inner wall of the outer cavity; the annular conductive groove is located at the bottom of the sliding ring.

[0017] The present invention is further configured such that the conductive assembly includes a moving oil guide ring fixedly disposed on the hub housing, a fixed oil guide ring rotatably connected to the moving oil guide ring in a sealed manner, and an oil guide column fixedly disposed on the hub housing; an oil guide cavity is provided between the moving oil guide ring and the fixed oil guide ring; the oil guide cavity is respectively connected to the oil guide column and the annular conductive groove; a third one-way valve is provided between the fixed oil guide ring and the annular conductive cover, communicating in the direction of the oil guide cavity;

[0018] The top of the oil guide column is rotatably and sealed to the bottom of the rotating shaft; the rotating shaft is provided with an oil guide channel; the bottom of the oil guide channel is connected to the oil guide column; the top of the oil guide channel is connected to the lower cavity; the connection between the top of the oil guide channel and the lower cavity is located at the top of the lower bearing.

[0019] The beneficial effects of the present invention are as follows: The present invention utilizes the rotational power of the rotor seat itself, and through the interaction between the drive pin on the rotor seat and the drive groove at the bottom of the annular piston, the circumferential rotation of the rotor seat is converted into the axial reciprocating motion of the annular piston. With the unidirectional conduction of the first one-way valve and the second one-way valve, the oil supply process of drawing oil from the reservoir, collecting oil into the annular oil storage chamber, and then pumping lubricating oil into the upper chamber through the drive pipe is automatically completed. The entire cycle does not require an additional oil pump or external power source, which effectively reduces manufacturing costs and failure risks. Attached Figure Description

[0020] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a cross-sectional view of the present invention;

[0023] Figure 3 yes Figure 2 A magnified view of part A in the middle;

[0024] Figure 4 This is a schematic diagram of the structure of the present invention after concealing the wheel hub shell;

[0025] Figure 5 This is a schematic diagram of the sliding ring structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the annular piston of the present invention;

[0027] The components include: 1. Stator support; 11. Upper cavity; 12. Middle cavity; 13. Lower cavity; 14. Upper bearing; 15. Lower bearing; 16. Liquid reservoir; 17. Iron core; 18. Coil; 2. Rotor seat; 21. Magnet; 22. Positioning boss; 23. Guide slope; 3. Hub shell; 31. Outer cavity; 4. Rotating shaft; 41. Tooth; 42. Gear; 43. Gear ring; 44. Oil guide channel; 51. Annular oil reservoir cover; 52. Annular piston; 53. Ring... 54. First check valve; 55. Drive pipe; 56. Second check valve; 6. Drive pin; 61. First drive arc groove; 62. First drive spiral groove; 63. Second drive arc groove; 64. Second drive spiral groove; 7. Sliding ring; 71. Reciprocating swing block; 72. Reciprocating spiral groove; 73. Annular guide cover; 74. Annular guide groove; 75. Third check valve; 81. Moving guide ring; 82. Fixed guide ring; 83. Guide chamber; 84. Guide column. Detailed Implementation

[0028] The present invention will be further described in conjunction with the following embodiments.

[0029] Depend on Figures 1 to 6 As can be seen, the hub motor described in this embodiment includes a stator support 1, a rotor seat 2 rotatably disposed within the stator support 1, and a hub housing 3 rotatably disposed outside the stator support 1; a transmission assembly is provided between the stator support 1 and the hub housing 3; a rotating shaft 4 is rotatably disposed within the stator support 1; the rotor seat 2 is connected to the rotating shaft 4; and the rotating shaft 4 is connected to the hub housing 3 via the transmission assembly.

[0030] The stator support 1 is provided with an upper cavity 11, a middle cavity 12 and a lower cavity 13 in sequence along the axial direction in the middle part; an upper bearing 14 is provided between one end of the rotating shaft 4 and the upper cavity 11; a lower bearing 15 is provided between the other end of the rotating shaft 4 and the lower cavity 13; an outer cavity 31 communicating with the middle cavity 12 is formed between the outer wall of the stator support 1 and the inner wall of the hub housing 3;

[0031] A liquid storage tank 16 is provided between the bottom of the lower cavity 13 and the rotor seat 2; a conductive assembly is provided between the hub shell 3 and the stator support 1; the outer cavity 31 is connected to the liquid storage tank 16 through the conductive assembly; a driving assembly is provided between the stator support 1 and the rotor seat 2; the driving assembly is used to transfer the lubricating oil in the liquid storage tank 16 to the upper cavity 11.

[0032] Specifically, in this embodiment, the hub motor rotates within the stator support 1 during operation, causing the rotating shaft 4 to rotate synchronously. The rotating shaft 4 drives the hub housing 3 to rotate relative to the stator support 1 via a transmission assembly, thus achieving power output. The drive assembly uses the rotational motion of the rotor housing 2 as a power source to continuously deliver the lubricating oil in the reservoir 16 to the upper cavity 11. The lubricating oil flows from top to bottom through the upper bearing 14 and the middle cavity 12, and a portion of it falls directly back to the lower cavity 13 to lubricate the lower bearing 15, finally flowing back to the reservoir. The liquid tank 16, and another part enters the outer cavity 31 with the movement of the transmission component. After heat exchange is completed on the inner wall of the hub housing 3, it flows back to the lower cavity 13 through the conduction component to replenish the lubrication of the lower bearing 15, and finally flows into the storage tank 16 to form a complete self-circulating loop of lubricating oil. In this embodiment, the power transmission, lubrication supply and heat dissipation return are integrated inside the hub housing 3. No additional external power and pipelines are required. Power output, motion lubrication and heat dissipation of the whole machine are realized simultaneously in a compact space, which improves the operational reliability and integration of the hub motor.

[0033] The hub motor described in this embodiment comprises a stator support 1, a rotor seat 2, a hub housing 3, a rotating shaft 4, an upper cavity 11, a lower cavity 13, an upper bearing 14, and a lower bearing 15, all arranged coaxially. Each component rotates synchronously or relative to the other around the same axis, and the rotation centers of the rotating shaft 4, the rotor seat 2, and the hub housing 3 always coincide, effectively avoiding vibration, uneven wear, and dynamic imbalance problems caused by eccentric rotation.

[0034] The hub motor described in this embodiment includes a transmission assembly comprising teeth 41 disposed on the outer periphery of a rotating shaft 4, a gear 42 rotatably disposed in a central cavity 12, and a gear ring 43 disposed on the inner wall of a hub housing 3; the two ends of the gear 42 respectively mesh with the gear ring 43 and the teeth 41 on the outer periphery of the rotating shaft 4. Specifically, the rotating shaft 4 rotates synchronously with the rotor seat 2, and the outer peripheral teeth 41 drive the gear 42 in the middle cavity 12 to rotate around its own axis. The gear 42 further meshes and drives the gear ring 43 to rotate synchronously with the hub shell 3. The power output effect of speed reduction and torque increase is achieved through the transmission of the gear 42. At the same time, during the meshing and rotation process, the gear 42 can carry the lubricating oil in the middle cavity 12 and throw it to the outer cavity 31, so that the lubricating oil can fully contact the inner wall of the hub shell 3 and accelerate the heat conduction. This transmission structure has a strong load-bearing capacity and smooth transmission. Moreover, the rotation and stirring effect of the gear 42 can actively drive the lubricating oil to flow to the outer cavity 31. The heat dissipation path of the lubricating oil can be realized without the need for an additional oil guide structure, which simplifies the internal oil circuit design.

[0035] In this embodiment, a hub motor is described, wherein the stator support 1 is provided with an iron core 17 and a coil 18; and the rotor base 2 is provided with a magnet 21. When current is passed through the coil 18 on the stator support 1, it generates an alternating magnetic field, which interacts with the magnet 21 on the rotor base 2, driving the rotor base 2 to rotate continuously relative to the stator support 1, providing rotational power for the entire machine. The rotor base 2 directly drives the rotating shaft 4 to rotate synchronously, transmitting electromagnetic power to the transmission components.

[0036] The hub motor described in this embodiment includes a drive assembly comprising an annular oil reservoir 51 fixedly disposed at the bottom of the lower cavity 13 and an annular piston 52 movably and sealingly disposed at the bottom of the annular oil reservoir 51; an annular oil reservoir 53 is formed between the annular oil reservoir 51 and the annular piston 52; a liquid storage tank 16 is disposed on the inner side of the annular oil reservoir 51; and a first one-way valve 54 is provided on the inner wall of the annular oil reservoir 51, which opens toward the annular oil reservoir 53. Specifically, the annular piston 52 reciprocates axially. When the annular piston 52 moves downward, the internal volume of the annular oil reservoir 53 increases, creating a negative pressure. Under the action of the pressure difference, the lubricating oil in the reservoir 16 pushes open the first one-way valve 54 and flows from the inside of the annular oil reservoir cover 51 into the annular oil reservoir 53 to complete the oil suction. When the annular piston 52 moves upward, the volume of the annular oil reservoir 53 decreases and the internal oil pressure increases. At this time, the first one-way valve 54 is closed by reverse pressure to prevent the lubricating oil from flowing back into the reservoir 16. This structure achieves the oil suction action through the volume change of the annular piston 52. Combined with the one-way conduction characteristic of the first one-way valve 54, the flow direction of the lubricating oil can be stably controlled.

[0037] In this embodiment, a hub motor is provided with a drive groove at the bottom of the annular piston 52; a drive pin 6 is provided on the rotor seat 2; the drive pin 6 is movably disposed in the drive groove; the drive groove includes a first drive arc groove 61, a first drive spiral groove 62, a second drive arc groove 63, and a second drive spiral groove 64 that are connected end to end along the circumferential direction; the depth of the first drive arc groove 61 is greater than the depth of the second drive arc groove 63. Specifically, the rotor seat 2 drives the drive pin 6 to perform synchronous circumferential motion, and the drive pin 6 is always engaged in the drive groove at the bottom of the annular piston 52. When the drive pin 6 slides along the second drive spiral groove 64 to the first drive arc groove 61, because the depth of the first drive arc groove 61 is greater than that of the second drive arc groove 63, the drive pin 6 will pull the annular piston 52 to move downward along the axial direction, realizing the oil suction stroke. When the drive pin 6 slides along the first drive spiral groove 62 to the second drive arc groove 63, the drive pin 6 pushes the annular piston 52 to move upward along the axial direction, realizing the oil pressure stroke. The drive pin 6 rotates continuously with the rotor seat 2 and slides cyclically in the four drive grooves that are connected end to end, driving the annular piston 52 to continuously perform axial reciprocating motion. This structure transforms the continuous circumferential motion of the rotor seat 2 into the periodic reciprocating oil pumping action of the annular piston 52. It does not require additional power components and can achieve stable self-driven oil pumping simply through the mechanical groove cooperation.

[0038] In this embodiment of the hub motor, a positioning boss 22 is provided in the middle of the rotor seat 2; an annular oil reservoir 51 is sleeved on the positioning boss 22; the annular oil reservoir 51 and the positioning boss 22 are rotatably and sealed together; the positioning boss 22 protrudes into the liquid storage tank 16; and the outer wall of the positioning boss 22 is provided with a guide slope 23. Specifically, the positioning boss 22 rotates synchronously with the rotor seat 2, while the annular oil reservoir 51 remains fixed and maintains a sealed rotational fit with the positioning boss 22. This provides radial positioning support for the annular oil reservoir 51, ensuring coaxiality, and also prevents lubricating oil from leaking from the fit gap. The positioning boss 22 protrudes into the liquid storage tank 16, and the guide slope 23 on its outer wall can guide the lubricating oil in the liquid storage tank 16 to flow towards the first one-way valve 54 during rotation, reducing oil deposition at the bottom of the liquid storage tank 16 and improving oil suction smoothness.

[0039] The hub motor described in this embodiment includes a drive tube 55 embedded in the stator bracket 1; one end of the drive tube 55 is connected to the annular oil storage chamber 53; the other end of the drive tube 55 is connected to the upper cavity 11; the connection between the other end of the drive tube 55 and the upper cavity 11 is located at the top of the upper bearing 14; the lower bearing 15 is located at the top of the liquid storage tank 16; a second one-way valve 56 that opens toward the drive tube 55 is provided between one end of the drive tube 55 and the annular oil storage cover 51. Specifically, the upward movement of the annular piston 52 increases the oil pressure in the annular oil reservoir 53. At this time, the second check valve 56 opens under the action of oil pressure, and the high-pressure lubricating oil is transported upward through the drive pipe 55, and finally flows out from the top of the upper bearing 14 of the upper cavity 11, directly immersing and lubricating the upper bearing 14. When the annular piston 52 moves downward to suck up oil, the second check valve 56 closes under reverse pressure to prevent the lubricating oil in the drive pipe 55 from flowing back to the annular oil reservoir 53, ensuring that the oil circuit on the side of the upper cavity 11 continuously stores oil. This structure delivers lubricating oil directly to the lubrication point of the upper bearing 14 through the drive pipe 55, achieving precise oil supply. With the check valve 56, it can ensure that the lubricating oil can be stably pushed to the upper part of the upper bearing 14 in each pumping stroke, avoiding the problem of insufficient lubrication of the upper bearing 14 caused by oil backflow, and improving the lubrication reliability of the upper bearing 14.

[0040] The hub motor described in this embodiment includes a sliding ring 7 that is slidably mounted on the inner wall of the hub housing 3; a reciprocating swing block 71 is rotatably mounted on the inner wall of the sliding ring 7; a reciprocating spiral groove 72 is provided on the outer wall of the stator support 1 along the circumferential direction; and the reciprocating swing block 71 is movably mounted in the reciprocating spiral groove 72.

[0041] The stator support 1 has an annular conductive cover 73 on its outer periphery at the bottom; the annular conductive cover 73 has an annular conductive groove 74; the outer wall of the annular conductive cover 73 is rotatably connected to the inner wall of the outer cavity 31; the annular conductive groove 74 is located at the bottom of the sliding ring 7.

[0042] Specifically, the hub housing 3 rotates relative to the stator support 1, causing the sliding ring 7 to rotate synchronously in the circumferential direction. The reciprocating swing block 71 on the inner wall of the sliding ring 7 slides along the reciprocating spiral groove 72 on the outer wall of the stator support 1. Under the guidance of the reciprocating spiral groove 72, the reciprocating swing block 71 drives the sliding ring 7 to perform periodic axial reciprocating lifting and lowering motion along the inner wall of the hub housing 3. During the lifting and lowering process, the sliding ring 7 can push the lubricating oil in the annular guide groove 74.

[0043] The hub motor described in this embodiment includes a conductive assembly that further comprises a moving oil guide ring 81 fixedly disposed on the hub housing 3, a fixed oil guide ring 82 rotatably connected to the moving oil guide ring 81 in a sealed manner, and an oil guide column 84 fixedly disposed on the hub housing 3; an oil guide cavity 83 is provided between the moving oil guide ring 81 and the fixed oil guide ring 82; the oil guide cavity 83 is respectively connected to the oil guide column 84 and the annular conductive groove 74; a third one-way valve 75 is provided between the fixed oil guide ring 82 and the annular conductive cover 73, communicating in the direction of the oil guide cavity 83;

[0044] The top of the oil guide column 84 is sealed and rotatably connected to the bottom of the rotating shaft 4; the rotating shaft 4 is provided with an oil guide channel 44; the bottom of the oil guide channel 44 is connected to the oil guide column 84; the top of the oil guide channel 44 is connected to the lower cavity 13; the connection between the top of the oil guide channel 44 and the lower cavity 13 is located at the top of the lower bearing 15.

[0045] Specifically, the sliding ring 7 descends and squeezes the lubricating oil in the annular guide groove 74, increasing the oil pressure and pushing open the third one-way valve 75. The lubricating oil enters the guide chamber 83 between the moving guide ring 81 and the fixed guide ring 82. The lubricating oil in the guide chamber 83 flows through the guide column 84 into the guide channel 44 at the bottom of the rotating shaft 4, and then upwards along the guide channel 44, flowing out from the top of the lower bearing 15. After replenishing lubrication of the lower bearing 15, it flows into the reservoir 16. The moving guide ring 81 rotates synchronously with the hub housing 3, and the fixed guide ring... The ring 82 remains relatively stationary, and the sealed rotational cooperation between the two ensures that the oil guide chamber 83 remains sealed even when rotating relative to each other, thus preventing oil leakage. This structure controls the direction of oil return through the third one-way valve 75, and uses the oil guide channel 44 inside the rotating shaft 4 to accurately deliver the cooled lubricating oil to the lubrication point of the lower bearing 15, realizing a complete oil return closed loop. This not only improves the lubrication effect of the lower bearing 15, but also allows the lubricating oil to quickly return to participate in the next cycle after heat exchange, thereby improving the overall cycle efficiency and heat dissipation effect.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A hub motor, characterized in that: The system includes a stator support (1), a rotor seat (2) rotatably disposed within the stator support (1), and a hub housing (3) rotatably disposed outside the stator support (1); a transmission assembly is provided between the stator support (1) and the hub housing (3); a rotating shaft (4) is rotatably disposed within the stator support (1); the rotor seat (2) is connected to the rotating shaft (4); and the rotating shaft (4) is connected to the hub housing (3) via the transmission assembly. The stator support (1) is provided with an upper cavity (11), a middle cavity (12) and a lower cavity (13) in sequence along the axial direction in the middle part; an upper bearing (14) is provided between one end of the rotating shaft (4) and the upper cavity (11); a lower bearing (15) is provided between the other end of the rotating shaft (4) and the lower cavity (13); an outer cavity (31) communicating with the middle cavity (12) is formed between the outer wall of the stator support (1) and the inner wall of the hub shell (3); A liquid storage tank (16) is provided between the bottom of the lower cavity (13) and the rotor seat (2); a conductive assembly is provided between the hub shell (3) and the stator support (1); the outer cavity (31) is connected to the liquid storage tank (16) through the conductive assembly; a drive assembly is provided between the stator support (1) and the rotor seat (2); the drive assembly is used to transfer the lubricating oil in the liquid storage tank (16) to the upper cavity (11).

2. The hub motor according to claim 1, characterized in that: The stator support (1), rotor seat (2), hub shell (3), rotating shaft (4), upper cavity (11), lower cavity (13), upper bearing (14) and lower bearing (15) are coaxially arranged.

3. A hub motor according to claim 1, characterized in that: The transmission assembly includes teeth (41) on the outer periphery of the rotating shaft (4), a gear (42) rotating in the middle cavity (12), and a gear ring (43) on the inner wall of the hub housing (3); the two ends of the gear (42) mesh with the gear ring (43) and the teeth (41) on the outer periphery of the rotating shaft (4), respectively.

4. A hub motor according to claim 1, characterized in that: The stator support (1) is provided with an iron core (17) and a coil (18); the rotor base (2) is provided with a magnet (21).

5. A hub motor according to claim 1, characterized in that: The drive assembly includes an annular oil reservoir (51) fixedly disposed at the bottom of the lower cavity (13) and an annular piston (52) that is sealed and movable at the bottom of the annular oil reservoir (51); an annular oil reservoir (53) is formed between the annular oil reservoir (51) and the annular piston (52); the liquid storage tank (16) is disposed on the inner side of the annular oil reservoir (51); the inner wall of the annular oil reservoir (51) is provided with a first one-way valve (54) that opens toward the annular oil reservoir (53).

6. A hub motor according to claim 5, characterized in that: The bottom of the annular piston (52) is provided with a drive groove; the rotor seat (2) is provided with a drive pin (6); the drive pin (6) is movably disposed in the drive groove; the drive groove includes a first drive arc groove (61), a first drive spiral groove (62), a second drive arc groove (63), and a second drive spiral groove (64) that are connected end to end along the circumferential direction; the depth of the first drive arc groove (61) is greater than the depth of the second drive arc groove (63).

7. A hub motor according to claim 5, characterized in that: The rotor seat (2) is provided with a positioning boss (22) in the middle; the annular oil storage cover (51) is sleeved on the positioning boss (22); the annular oil storage cover (51) and the positioning boss (22) are sealed and rotatably connected; the positioning boss (22) protrudes into the liquid storage tank (16); the outer wall of the positioning boss (22) is provided with a guide slope (23).

8. A hub motor according to claim 5, characterized in that: The drive assembly also includes a drive tube (55) embedded in the stator support (1); one end of the drive tube (55) is connected to the annular oil storage chamber (53); the other end of the drive tube (55) is connected to the upper cavity (11); the connection between the other end of the drive tube (55) and the upper cavity (11) is located at the top of the upper bearing (14); the lower bearing (15) is located at the top of the liquid storage tank (16); a second one-way valve (56) that opens toward the drive tube (55) is provided between one end of the drive tube (55) and the annular oil storage cover (51).

9. A hub motor according to claim 1, characterized in that: The conductive assembly includes a sliding ring (7) that is slidably mounted on the inner wall of the hub housing (3); the inner wall of the sliding ring (7) is provided with a reciprocating swing block (71); the outer wall of the stator bracket (1) is provided with a reciprocating spiral groove (72) along the circumferential direction; the reciprocating swing block (71) is movably mounted in the reciprocating spiral groove (72); The stator support (1) has an annular conductive cover (73) on its outer periphery at the bottom; the annular conductive cover (73) has an annular conductive groove (74); the outer wall of the annular conductive cover (73) is rotatably connected to the inner wall of the outer cavity (31); the annular conductive groove (74) is located at the bottom of the sliding ring (7).

10. A hub motor according to claim 9, characterized in that: The conductive assembly further includes a moving oil guide ring (81) fixedly disposed on the hub housing (3), a fixed oil guide ring (82) rotatably connected to the moving oil guide ring (81) in a sealed manner, and an oil guide column (84) fixedly disposed on the hub housing (3); an oil guide cavity (83) is provided between the moving oil guide ring (81) and the fixed oil guide ring (82); the oil guide cavity (83) is connected to the oil guide column (84) and the annular conductive groove (74) respectively; a third one-way valve (75) is provided between the fixed oil guide ring (82) and the annular conductive cover (73) and communicates in the direction of the oil guide cavity (83); The top of the oil guide column (84) is sealed and rotatably connected to the bottom of the rotating shaft (4); the rotating shaft (4) is provided with an oil guide channel (44); the bottom of the oil guide channel (44) is connected to the oil guide column (84); the top of the oil guide channel (44) is connected to the lower cavity (13); the connection between the top of the oil guide channel (44) and the lower cavity (13) is located at the top of the lower bearing (15).

Images