Planetary reduction hub motor

Abstract

The utility model discloses a kind of planetary reduction hub motors, partition is provided in shell, partition and upper end cap form a reduction installation cavity, partition and lower end cap form a drive installation cavity, drive device is set in drive installation cavity, planetary reduction device is set in reduction installation cavity;The inner stator of drive device is fixedly installed in motor shaft, outer rotor is sleeved in motor shaft, the upper portion of outer rotor is provided with upper connecting convex part, upper connecting convex part is rotatably connected with partition, the sun gear cover of planetary reduction device is sleeved in motor shaft and is fixedly connected with upper connecting convex part, planet carrier is fixedly installed in motor shaft. The inner cavity of shell is divided into independent reduction installation cavity and drive installation cavity by partition, avoid lubricating grease to infiltrate into drive device, reduce failure rate, prolong service life, reduce operating noise;Inner stator is fixed to motor shaft, outer rotor is rotatably connected with partition, cooperate with the end connection of motor shaft, form multi-point force support, improve structural strength.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a planetary geared hub motor. Background Technology

[0002] Planetary geared motors are efficient, precise, and compact power transmission devices. Through a planetary gear structure, they convert the high-speed, low-torque characteristics of a motor into the low-speed, high-torque requirements of the equipment. In-wheel motors are external rotor motors, while planetary geared in-wheel motors incorporate a planetary gear structure within the in-wheel motor itself to convert the high-speed, low-torque characteristics of the in-wheel motor into a low-speed, high-torque characteristic.

[0003] Because planetary gear hub motors consist of a motor and planetary gears, they have a relatively complex gear transmission structure. The motor shaft is often only connected to the housing at both ends, resulting in few stress points and low structural strength. Furthermore, the existing motor and planetary gear structure are located in the same cavity within the housing. Since the planetary gear structure requires lubrication, prolonged operation can cause lubricating grease to enter the motor, damaging it, leading to a high failure rate and poor reliability and stability. Conversely, placing the motor in a separate housing would result in poor heat dissipation and a large size. Therefore, improvements are necessary. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a planetary geared hub motor that improves structural strength, avoids motor contamination by lubricating grease, reduces failure rate, and enhances reliability and stability.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a planetary geared hub motor, comprising a housing, an upper end cover, a lower end cover, a motor shaft, a drive device, and a planetary gear reducer. The upper end cover and the lower end cover are respectively disposed at the upper and lower ends of the housing. The motor shaft is disposed inside the housing, and both ends of the motor shaft are rotatably connected to the upper end cover and the lower end cover, respectively. At least one end of the motor shaft extends through the upper end cover or the lower end cover. The drive device and the planetary gear reducer are respectively disposed inside the housing. The drive device is drive-connected to the planetary gear reducer, and the planetary gear reducer is drive-connected to the housing. A partition is disposed inside the housing. A reduction mounting cavity is formed between the partition and the upper end cover, and a drive mounting cavity is formed between the partition and the lower end cover. The drive device is disposed inside the drive mounting cavity, and the planetary gear reducer is disposed inside the reduction mounting cavity.

[0006] The drive unit includes an outer rotor and an inner stator. The inner stator is fixedly mounted on the motor shaft, and the outer rotor is sleeved on the motor shaft. The upper part of the outer rotor is provided with an upper connecting protrusion, which is rotatably connected to a partition plate.

[0007] The planetary gear reducer includes a planetary carrier, a sun gear, an internal gear ring, and multiple planetary gears. The sun gear is sleeved on the motor shaft and fixedly connected to the upper connecting protrusion. The planetary carrier is fixedly installed on the motor shaft. Each planetary gear is rotatably installed on the planetary carrier. Each planetary gear is spaced around the sun gear along the circumferential direction and meshes with the sun gear. The outer wall of the internal gear ring is fixedly connected to the inner wall of the reduction mounting cavity or integrally formed. The internal gear ring meshes with each planetary gear.

[0008] In a further technical solution, a partition through hole is provided in the middle of the partition, the upper connecting protrusion is inserted into the partition through hole, an inner sealing bearing is provided between the upper connecting protrusion and the inner wall of the partition through hole, and an outer sealing bearing is provided between the motor shaft and the upper end cover and the lower end cover respectively.

[0009] The center of the sun tooth has a sun hole that passes through the sun tooth. The motor shaft passes through the sun hole and is fitted with the sun hole with clearance. The lower part of the sun tooth has a spline part, and the upper connecting protrusion has a spline groove. The spline part is tightly inserted into the spline groove.

[0010] In a further technical solution, the outer rotor includes a rotor end cover, a magnetic yoke cylinder, and multiple permanent magnets. The rotor end cover is fixedly installed on the upper end of the magnetic yoke cylinder. Each permanent magnet is spaced along the circumferential direction on the inner wall of the magnetic yoke cylinder. Multiple downward-extending magnetic strips are spaced along the circumferential direction on the lower part of the rotor end cover. Each magnetic strip is inserted between two adjacent permanent magnets. The inner stator is located inside the magnetic yoke cylinder. A downward-protruding lower connecting protrusion is provided on the lower part of the rotor end cover. A motor bearing is provided between the lower connecting protrusion and the inner stator. The rotor end cover and the motor shaft are in clearance fit.

[0011] In a further technical solution, the inner stator includes a stator mounting base, an iron core, and a coil. The iron core is fixedly installed on the outer circumference of the stator mounting base. The stator mounting base is fixedly connected to the lower part of the motor shaft. The coil is wound around the iron core. The upper part of the stator mounting base has an upward-facing connecting groove. The lower connecting protrusion extends into the connecting groove. The motor bearing is located between the stator mounting base and the lower connecting protrusion.

[0012] In a further technical solution, the drive device is also provided with a PCB control board and connecting wires. The PCB control board is fixedly installed on the lower part of the inner stator. The motor shaft has a wire hole in the axial direction. The wire hole passes through at least one end of the motor shaft. A lead wire port is provided on the side of the motor shaft adjacent to the PCB control board. The lead wire port is connected to the wire hole. The connecting wire passes through the wire hole and the lead wire port in sequence and is electrically connected to the PCB control board.

[0013] In a further technical solution, the wire hole is filled with sealant, and an oil seal is provided between the motor shaft and the upper and / or lower end cover, with the oil seal located outside the outer sealing bearing.

[0014] In a further technical solution, the lower end of the motor shaft extends through the lower end cover, the oil seal is located between the lower end cover and the motor shaft, and the wire hole passes through the lower end face of the motor shaft.

[0015] In a further technical solution, the two ends of the motor shaft extend through the upper end cover and the lower end cover respectively, and an oil seal is provided between the upper end cover and the lower end cover and the motor shaft.

[0016] In a further technical solution, the planetary carrier includes an upper carrier body and a lower carrier body. The upper carrier body is fixedly installed on the upper part of the lower carrier body. The sun gear and each planetary gear are respectively arranged between the upper carrier body and the lower carrier body. The upper part of the upper carrier body is provided with an upwardly protruding carrier connecting protrusion. The carrier connecting protrusion is rotatably connected to the upper end cover. The external sealing bearing located on the upper part of the motor shaft is arranged between the upper end cover and the carrier connecting protrusion.

[0017] The frame connecting protrusion has a frame through hole that passes through the upper frame. The inner wall of the frame through hole is provided with a keyway. The motor shaft is provided with a connecting key at the position of the keyway, and the connecting key is embedded in the corresponding keyway.

[0018] In a further technical solution, the lower end face of the upper end cover is provided with a downwardly protruding upper connecting ring, and the upper end face of the lower end cover is provided with an upwardly protruding lower connecting ring. The upper connecting ring is inserted into the deceleration mounting cavity, and the lower connecting ring is inserted into the drive mounting cavity. The outer side walls of the upper and lower connecting rings are respectively provided with annular sealing grooves. Each annular sealing groove is embedded with a sealing ring. The two sealing rings protrude from the outer side walls of the upper and lower connecting rings respectively, and the two sealing rings abut against the inner walls of the deceleration mounting cavity and the drive mounting cavity respectively.

[0019] The outer shell is fitted with a tire, and one end of the tire is provided with a connecting surface, which is connected to the upper or lower end cover by screws.

[0020] The advantages of this utility model compared with the prior art after adopting the above structure are as follows: the inner cavity of the housing is divided into an independent reduction mounting cavity and a drive mounting cavity by the partition, so that the planetary reduction device and the drive device are physically isolated. The lubricating grease required by the planetary reduction device is confined in the reduction mounting cavity, which avoids the problem of component damage caused by lubricating grease seeping into the drive device, reduces the failure rate, extends the service life of the drive device, and the independent cavity allows the planetary reduction device to be fully filled with lubricating grease, reduces gear meshing friction, and reduces operating noise.

[0021] The inner stator is fixed to the motor shaft, and the outer rotor is rotatably connected to the partition through the upper connecting protrusion. It is connected to the upper and lower end covers at both ends of the motor shaft, so that the motor shaft forms a multi-point force support structure, which improves the structural strength. The planetary carrier is fixed to the motor shaft, which improves the axial rigidity of the motor shaft, avoids the motor shaft shaking during high-speed operation, and improves the reliability and stability of the equipment operation.

[0022] The drive mounting cavity and the reduction gear mounting cavity are relatively sealed by an internal sealing bearing, and then the drive mounting cavity and the reduction gear mounting cavity are relatively sealed to the outside by an oil seal. At the same time, the connecting wire passes through the wire hole of the motor shaft and the wire hole is filled with sealant so that the drive mounting cavity and the reduction gear mounting cavity form independent sealed chambers, thereby improving the sealing performance.

[0023] The drive unit does not require a casing, which reduces its size while improving heat dissipation performance. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model;

[0026] Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model;

[0027] Figure 3 This is an exploded view of Embodiment 1 of this utility model;

[0028] Figure 4 This is a structural schematic diagram of Embodiment 2 of this utility model;

[0029] Figure 5 This is a cross-sectional view of Embodiment 2 of this utility model.

[0030] In the picture:

[0031] 1. Housing, 11. Partition plate, 111. Partition plate perforation, 12. Inner sealing bearing, 13. Reduction mounting cavity, 14. Drive mounting cavity, 15. Upper end cover, 151. Upper connecting ring, 16. Lower end cover, 161. Lower connecting ring, 17. Annular sealing groove, 171. Sealing ring, 18. Outer sealing bearing, 19. Oil seal.

[0032] 2. Motor shaft; 21. Wire hole; 22. Wire inlet; 23. Connecting key;

[0033] 3 Drive unit, 31 Outer rotor, 311 Rotor end cover, 312 Upper connecting protrusion, 313 Lower connecting protrusion, 314 Spline groove, 315 Magnetic strip, 316 Magnetic yoke, 317 Permanent magnet, 32 Inner stator, 321 Stator fixing seat, 322 Connecting groove, 323 Iron core, 33 Motor bearing, 34 PCB control board, 35 Connecting wire;

[0034] 4. Planetary reduction gear, 41. Planetary carrier, 411. Upper carrier body, 412. Carrier connecting protrusion, 413. Carrier perforation, 414. Keyway, 415. Lower carrier body, 42. Sun tooth, 421. Sun perforation, 422. Spline part, 43. Internal gear ring, 44. Planetary tooth.

[0035] 5. Tire, 51. Connecting surface. Detailed Implementation

[0036] The following are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention.

[0037] Example 1

[0038] A planetary geared hub motor, such as Figures 1 to 3As shown, the device includes a housing 1, an upper end cover 15, a lower end cover 16, a motor shaft 2, a drive unit 3, and a planetary reducer 4. The upper end cover 15 and lower end cover 16 are respectively located at the upper and lower ends of the housing 1. The motor shaft 2 is located inside the housing 1, with both ends rotatably connected to the upper end cover 15 and lower end cover 16 respectively. The upper end of the motor shaft 2 extends through the upper end cover 15, and the lower end extends through the lower end cover 16. The drive unit 3 and planetary reducer 4 are respectively located inside the housing 1, with the drive unit 3 and planetary reducer 4 being drive-connected. The planetary reducer 4 is also drive-connected to the housing 1. A partition 11 is provided inside the housing 1, forming a reduction mounting cavity 13 between the partition 11 and the upper end cover 15, and a drive mounting cavity 14 between the partition 11 and the lower end cover 16. The drive unit 3 is located within the drive mounting cavity 14. The planetary reducer 4... The drive unit 3 is located inside the reduction mounting cavity 13. The drive unit 3 includes an outer rotor 31 and an inner stator 32. The inner stator 32 is fixedly mounted on the motor shaft 2. The outer rotor 31 is sleeved on the motor shaft 2. The upper part of the outer rotor 31 is provided with an upper connecting protrusion 312. The upper connecting protrusion 312 is rotatably connected to the partition plate 11. The planetary reduction device 4 includes a planet carrier 41, a sun gear 42, an inner gear ring 43, and multiple planetary gears 44. The sun gear 42 is sleeved on the motor shaft 2 and fixedly connected to the upper connecting protrusion 312. The planet carrier 41 is fixedly mounted on the motor shaft 2. Each planetary gear 44 is rotatably mounted on the planet carrier 41. Each planetary gear 44 is spaced around the sun gear 42 along the circumferential direction and meshes with the sun gear 42. The outer wall of the inner gear ring 43 is fixedly connected to the inner wall of the reduction mounting cavity 13 or integrally formed. The inner gear ring 43 meshes with each planetary gear 44. The inner cavity of the housing 1 is divided into an independent reduction mounting cavity 13 and a drive mounting cavity 14 by the partition 11, which physically isolates the planetary reducer 4 from the drive unit 3. The lubricating grease required by the planetary reducer 4 is confined within the reduction mounting cavity 13, which avoids damage to components caused by lubricating grease seeping into the drive unit 3, reduces the failure rate, and extends the service life of the drive unit 3. In addition, the independent cavity allows the planetary reducer 4 to be fully filled with lubricating grease, reducing gear meshing friction and reducing operating noise. The inner stator 32 is fixed to the motor shaft 2, and the outer rotor 31 is rotatably connected to the partition 11 through the upper connecting protrusion 312. It is connected to the upper end cover 15 and the lower end cover 16 at both ends of the motor shaft 2, so that the motor shaft 2 forms a multi-point force support structure, which improves the structural strength. The planetary carrier 41 is fixed to the motor shaft 2, which improves the axial rigidity of the motor shaft 2, avoids the motor shaft 2 from shaking during high-speed operation, and improves the reliability and stability of the equipment operation. The drive unit 3 does not need to be equipped with a shell, which reduces the volume and improves the heat dissipation performance. The planetary reduction gear 4 is directly fixed to the outer rotor 31 via the sun gear 42, resulting in a short and efficient power transmission path. The structure of the inner gear ring 43 being fixed to the housing 1 and the planetary gear 44 engaging with both the sun gear 42 and the inner gear ring 43 ensures a stable conversion from high speed and low torque to low speed and high torque.

[0039] Specifically, the partition 11 has a partition through hole 111 in the middle, the upper connecting protrusion 312 is inserted into the partition through hole 111, and an inner sealing bearing 12 is provided between the upper connecting protrusion 312 and the inner wall of the partition through hole 111. The motor shaft 2 is provided with an outer sealing bearing 18 between the upper end cover 15 and the lower end cover 16 respectively. The center of the sun tooth 42 has a sun through hole 421 that penetrates the sun tooth 42. The motor shaft 2 passes through the sun through hole 421 and is clearance-fitted with the sun through hole 421. The lower part of the sun tooth 42 has a spline part 422, and the upper connecting protrusion 312 has a spline groove 314. The spline part 422 is tightly inserted into the spline groove 314. The inner sealing bearing 12 at the perforation 111 of the partition plate achieves a relative seal between the drive mounting cavity 14 and the reduction mounting cavity 13, preventing lubricating grease in the reduction mounting cavity 13 from entering the drive mounting cavity 14. The outer sealing bearings 18 between the motor shaft 2 and the upper end cover 15 and the lower end cover 16 not only provide support and lubrication but also form the first sealing barrier between the cavity and the outside world, reducing the erosion of internal components by external dust and moisture, and further strengthening the isolation function of the cavity structure. The sun gear 42 is tightly connected to the spline groove 314 of the upper connecting protrusion 312 through the spline part 422. Compared with ordinary rigid connection, the spline has a large contact area, uniform force distribution, and small stress concentration at the tooth root, which can withstand greater transmitted torque. At the same time, it ensures the alignment of the sun gear 42 and the outer rotor 31, avoids eccentric wear during transmission, and improves the stability and durability of power transmission. The clearance fit design between the motor shaft 2 and the sun aperture 421 makes the fixed support of the motor shaft 2 and the rotational transmission of the sun gear 42 independent of each other. This ensures the normal operation of the planetary reducer 4 without affecting the rigid support effect of the motor shaft 2, avoids motion interference between components, makes the structure more compact, makes full use of the installation space, and reduces the volume.

[0040] Specifically, the outer rotor 31 includes a rotor end cover 311, a magnetic yoke cylinder 316, and a plurality of permanent magnets 317. The rotor end cover 311 is fixedly installed on the upper end of the magnetic yoke cylinder 316. Each permanent magnet 317 is spaced along the circumferential direction on the inner wall of the magnetic yoke cylinder 316. The lower part of the rotor end cover 311 is spaced along the circumferential direction with a plurality of downwardly extending magnetic strips 315. Each magnetic strip 315 is inserted between two adjacent permanent magnets 317. The inner stator 32 is located inside the magnetic yoke cylinder 316. The lower part of the rotor end cover 311 is provided with a downwardly protruding lower connecting protrusion 313. A motor bearing 33 is provided between the lower connecting protrusion 313 and the inner stator 32. The rotor end cover 311 is clearance-fitted with the motor shaft 2. The magnetic strip 315 at the lower part of the rotor end cover 311 is inserted between adjacent permanent magnets 317 to form a magnetic bridge structure, which effectively reduces magnetic leakage between permanent magnets 317, improves magnetic field utilization, and enhances the output power and energy utilization efficiency of the drive device 3. The rotor end cover 311 is made of plastic, and the magnetic strip 315 is formed on the rotor end cover 311. The upper part of the outer rotor 31 is connected to the partition plate 11 through the upper connecting protrusion 312 and the inner sealing bearing 12, and the lower part of the outer rotor 31 is connected to the inner stator 32 through the lower connecting protrusion 313 and the motor bearing 33, forming a bidirectional support structure. This not only improves the structural strength but also improves the stability during operation, reduces resistance, makes the motor shaft 2 rotate more smoothly, avoids the motor shaft 2 from shaking during high-speed rotation, reduces radial friction between the inner stator and the partition plate 11, and extends the service life. The clearance fit between the rotor end cover 311 and the motor shaft 2 completely separates the rotational motion of the outer rotor 31 from the fixed support of the motor shaft 2. This avoids torque interference to the motor shaft 2 when the outer rotor 31 is running, and ensures that the rigid support of the motor shaft 2 is not affected, thereby improving the overall operational stability of the structure.

[0041] Specifically, the inner stator 32 includes a stator mounting base 321, an iron core 323, and a coil. The iron core 323 is fixedly installed on the outer circumference of the stator mounting base 321. The stator mounting base 321 is fixedly connected to the lower part of the motor shaft 2. The coil is wound around the iron core 323. The upper part of the stator mounting base 321 has an upward-facing connecting groove 322. The lower connecting protrusion 313 extends into the connecting groove 322. The motor bearing 33 is disposed between the stator mounting base 321 and the lower connecting protrusion 313. The connecting groove 322 provides installation and positioning space for the lower connecting protrusion 313, making the fit between the lower connecting protrusion 313 and the motor bearing 33 tighter. This avoids the magnetic field eccentricity problem caused by the installation misalignment of the outer rotor 31, ensures uniform air gap between the inner stator 32 and the outer rotor 31, reduces electromagnetic noise and energy loss during operation, and makes the structure more compact and reduces the volume. The motor bearing 33 is set between the stator fixing seat 321 and the lower connecting protrusion 313. The rigid structure of the stator fixing seat 321 provides a stable installation foundation for the motor bearing 33. Compared with the traditional cantilever installation, the motor bearing 33 is subjected to more uniform force, can better bear the radial load of the outer rotor 31, extend the service life of the motor bearing 33, and further improve the smoothness of the operation of the outer rotor 31. The stator mounting base 321 is fixedly connected to the lower part of the motor shaft 2, making the inner stator 32 another support point of the motor shaft 2. Together with the planetary carrier 41 and the outer rotor 31, the overall rigidity of the motor shaft 2 is further strengthened, and the anti-deformation ability of the shaft system under high speed and high load conditions is improved.

[0042] Specifically, the drive unit 3 also includes a PCB control board 34 and connecting wires 35. The PCB control board 34 is fixedly installed on the lower part of the inner stator 32. The motor shaft 2 has a through hole 21 along the axial direction, which passes through the lower end face of the motor shaft 2. A lead-in port 22 is provided on the side of the motor shaft 2 adjacent to the PCB control board 34, and the lead-in port 22 communicates with the through hole 21. The connecting wire 35 passes through the through hole 21 and the lead-in port 22 in sequence and is electrically connected to the PCB control board 34. The PCB control board 34 is fixed on the lower part of the inner stator 32, and the installation position is compact and stable, without occupying additional cavity space. The coil is electrically connected to the PCB control board 34, which shortens the connection distance between the coil and the PCB control board 34. The connecting wire 35 is led out through the through hole 21, and the wiring is neat, which facilitates later maintenance and repair and reduces the wiring difficulty in production assembly. The lead-in port 22 is located between the PCB control board 34 and the stator mounting base 321, facilitating the connection wire 35 to pass through the lead-in port 22 and enter the gap between the PCB control board 34 and the stator mounting base 321. Of course, due to the influence of the thickness of the connection wire 35, in order to shorten the gap between the PCB control board 34 and the stator mounting base 321, the lead-in port 22 can also be set at the connection between the motor shaft 2 and the stator mounting base 321, and at the same time, a corresponding through hole is opened on the stator mounting base 321 to allow the connection wire 35 to pass through the stator mounting base 321 and electrically connect to the PCB control board 34.

[0043] Specifically, the wire hole 21 is filled with sealant, and oil seals 19 are respectively installed between the motor shaft 2 and the upper end cover 15 and the lower end cover 16. The oil seals 19 are located outside the outer sealing bearing 18. The drive mounting cavity 14 and the reduction mounting cavity 13 are relatively sealed by the inner sealing bearing 12, and the oil seals 19 form a second sealing barrier between the drive mounting cavity 14 and the reduction mounting cavity 13 and the outside. At the same time, the connecting wire 35 passes through the wire hole 21 of the motor shaft 2 and is filled with sealant, so that the drive mounting cavity 14 and the reduction mounting cavity 13 form independent sealed chambers, improving the sealing performance.

[0044] Specifically, the planetary carrier 41 includes an upper carrier body 411 and a lower carrier body 415. The upper carrier body 411 is fixedly installed on the upper part of the lower carrier body 415. The sun gear 42 and each planetary gear 44 are respectively arranged between the upper carrier body 411 and the lower carrier body 415. The upper part of the upper carrier body 411 is provided with an upwardly protruding carrier connecting protrusion 412. The carrier connecting protrusion 412 is rotatably connected to the upper end cover 15. The outer sealing bearing 18 located on the upper part of the motor shaft 2 is arranged between the upper end cover 15 and the carrier connecting protrusion 412. The carrier connecting protrusion 412 has a carrier through hole 413 that penetrates the upper carrier body 411. The inner wall of the carrier through hole 413 is provided with a keyway 414. The motor shaft 2 is provided with a connecting key 23 at the position corresponding to the keyway 414. The connecting key 23 is embedded in the corresponding keyway 414. The upper frame 411 and the lower frame 415 are connected by screws. The upper frame 411 or the lower frame 415 extends out a connecting post for mounting the planetary gear 44, which facilitates assembly and maintenance. The upper part of the motor shaft 2 is rotatably connected to the upper end cover 15 through the upper frame 411, so that the planetary carrier 41 can share the load-bearing force of the motor shaft 2, allowing the outer sealing bearing 18 to be selected with a larger diameter, thus improving the support force. The motor shaft 2 is connected to the keyway 414 of the planetary carrier 41 through the connecting key 23, which transmits large torque and has reliable contact, effectively avoiding slippage problems in high-speed transmission, ensuring the power transmission efficiency and stability of the planetary reduction device, and further facilitating assembly and maintenance.

[0045] Specifically, the lower end face of the upper end cover 15 is provided with a downwardly protruding upper connecting ring 151, and the upper end face of the lower end cover 16 is provided with an upwardly protruding lower connecting ring 161. The upper connecting ring 151 is inserted into the reduction gear mounting cavity 13, and the lower connecting ring 161 is inserted into the drive mounting cavity 14. Annular sealing grooves 17 are respectively formed on the outer walls of the upper connecting ring 151 and the lower connecting ring 161. A sealing ring 171 is embedded in each annular sealing groove 17. The two sealing rings 171 protrude from the outer walls of the upper connecting ring 151 and the lower connecting ring 161, respectively. Each sealing ring 171 abuts against the inner wall of the deceleration mounting cavity 13 and the drive mounting cavity 14, respectively. The upper connecting ring 151 and the lower connecting ring 161 are inserted into the deceleration mounting cavity 13 and the drive mounting cavity 14, respectively, and cooperate with the sealing ring 171 in the annular sealing groove 17 to abut against the inner wall of the cavity, forming a rigid sealing structure between the upper end cover 15 and the lower end cover 16 and the housing 1. This completely seals the gaps at the mating surfaces of the upper end cover 15 and the lower end cover 16 and the housing 1, preventing external water and dust from entering the cavity through the mating surfaces and enhancing the overall sealing performance. A tire 5 is fitted onto the outside of the housing 1. One end of the tire 5 has a connecting surface 51, which is connected to the upper end cover 15 or the lower end cover 16 by screws. The tire 5 is directly screwed to the upper end cover 15 or the lower end cover 16 through the connecting surface 51, facilitating tire replacement.

[0046] This embodiment provides a planetary geared hub motor, such as Figure 4 and 5 As shown, the structure of the planetary gear hub motor in this embodiment is basically the same as that in Embodiment 1. The difference is that in this embodiment, only the lower end of the motor shaft 2 protrudes from the lower end cover 16, and the upper end of the motor shaft 2 is located in the reduction mounting cavity 13. An oil seal 19 is provided between the motor shaft 2 and the lower end cover 16, forming a planetary gear hub motor with a single-sided output shaft. This is suitable for equipment with single-end power output or equipment with external mounting. Compared with the dual-output shaft structure, it only reduces the oil seal 19 at the upper end cover 15 and the installation process, simplifying the overall structure. In production, only the corresponding upper end cover 15 and motor shaft 2 need to be replaced, which reduces the production cost. Users can choose according to their needs.

[0047] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A planetary geared hub motor, comprising a housing (1), an upper end cover (15), a lower end cover (16), a motor shaft (2), a drive device (3), and a planetary gear reducer (4), wherein the upper end cover (15) and the lower end cover (16) are respectively disposed at the upper and lower ends of the housing (1), the motor shaft (2) is disposed inside the housing (1), and both ends of the motor shaft (2) are rotatably connected to the upper end cover (15) and the lower end cover (16) respectively, and at least one end of the motor shaft (2) extends through the upper end cover (15) or the lower end cover (16), the drive device (3) and the planetary gear reducer (4) are respectively disposed inside the housing (1), the drive device (3) is drive-connected to the planetary gear reducer (4), and the planetary gear reducer (4) is drive-connected to the housing (1), characterized in that: A partition (11) is provided inside the housing (1). A deceleration mounting cavity (13) is formed between the partition (11) and the upper end cover (15). A drive mounting cavity (14) is formed between the partition (11) and the lower end cover (16). A drive device (3) is provided in the drive mounting cavity (14). A planetary deceleration device (4) is provided in the deceleration mounting cavity (13). The drive unit (3) includes an outer rotor (31) and an inner stator (32). The inner stator (32) is fixedly mounted on the motor shaft (2), and the outer rotor (31) is sleeved on the motor shaft (2). The upper part of the outer rotor (31) is provided with an upper connecting protrusion (312), which is rotatably connected to the partition plate (11). The planetary reducer (4) includes a planet carrier (41), a sun gear (42), an internal gear ring (43), and multiple planetary gears (44). The sun gear (42) is sleeved on the motor shaft (2) and fixedly connected to the upper connecting protrusion (312). The planet carrier (41) is fixedly installed on the motor shaft (2). Each planetary gear (44) is rotatably installed on the planet carrier (41). Each planetary gear (44) is spaced around the sun gear (42) along the circumferential direction and meshes with the sun gear (42). The outer wall of the internal gear ring (43) is fixedly connected to or integrally formed with the inner wall of the reducer mounting cavity (13). The internal gear ring (43) meshes with each planetary gear (44).

2. The planetary geared hub motor according to claim 1, characterized in that: The partition (11) has a partition through hole (111) in the middle. The upper connecting protrusion (312) is inserted into the partition through hole (111). An inner sealing bearing (12) is provided between the upper connecting protrusion (312) and the inner wall of the partition through hole (111). An outer sealing bearing (18) is provided between the motor shaft (2) and the upper end cover (15) and the lower end cover (16) respectively. The center of the sun tooth (42) is provided with a sun hole (421) that penetrates the sun tooth (42). The motor shaft (2) is inserted into the sun hole (421) with clearance fit. The lower part of the sun tooth (42) is provided with a spline part (422), and the upper connecting protrusion (312) is provided with a spline groove (314). The spline part (422) is tightly inserted into the spline groove (314).

3. A planetary geared hub motor according to claim 1, characterized in that: The outer rotor (31) includes a rotor end cover (311), a magnetic yoke cylinder (316), and a plurality of permanent magnets (317). The rotor end cover (311) is fixedly installed on the upper end of the magnetic yoke cylinder (316). Each permanent magnet (317) is spaced along the circumferential direction on the inner wall of the magnetic yoke cylinder (316). The lower part of the rotor end cover (311) is spaced along the circumferential direction with a plurality of downwardly extending magnetic strips (315). Each magnetic strip (315) is inserted between two adjacent permanent magnets (317). The inner stator (32) is located inside the magnetic yoke cylinder (316). The lower part of the rotor end cover (311) is provided with a downwardly protruding lower connecting protrusion (313). A motor bearing (33) is provided between the lower connecting protrusion (313) and the inner stator (32). The rotor end cover (311) is clearance-fitted with the motor shaft (2).

4. A planetary geared hub motor according to claim 3, characterized in that: The inner stator (32) includes a stator fixing seat (321), an iron core (323) and a coil. The iron core (323) is fixedly installed on the outer circumference of the stator fixing seat (321). The stator fixing seat (321) is fixedly connected to the lower part of the motor shaft (2). The coil is wound around the iron core (323). The upper part of the stator fixing seat (321) is provided with an upward-facing connecting groove (322). The lower connecting protrusion (313) extends into the connecting groove (322). The motor bearing (33) is disposed between the stator fixing seat (321) and the lower connecting protrusion (313).

5. A planetary geared hub motor according to claim 2, characterized in that: The drive device (3) is also provided with a PCB control board (34) and a connecting wire (35). The PCB control board (34) is fixedly installed on the lower part of the inner stator (32). The motor shaft (2) is provided with a wire hole (21) along the axial direction. The wire hole (21) passes through at least one end of the motor shaft (2). The side of the motor shaft (2) adjacent to the PCB control board (34) is provided with a lead wire port (22). The lead wire port (22) is connected to the wire hole (21). The connecting wire (35) passes through the wire hole (21) and the lead wire port (22) in sequence and is electrically connected to the PCB control board (34).

6. A planetary geared hub motor according to claim 5, characterized in that: The threading hole (21) is filled with sealant, and an oil seal (19) is provided between the motor shaft (2) and the upper end cover (15) and / or the lower end cover (16). The oil seal (19) is located outside the outer sealing bearing (18).

7. A planetary geared hub motor according to claim 6, characterized in that: The lower end of the motor shaft (2) extends through the lower end cover (16), the oil seal (19) is disposed between the lower end cover (16) and the motor shaft (2), and the wire hole (21) passes through the lower end face of the motor shaft (2).

8. A planetary geared hub motor according to claim 6, characterized in that: The two ends of the motor shaft (2) pass through the upper end cover (15) and the lower end cover (16) respectively. An oil seal (19) is provided between the upper end cover (15) and the lower end cover (16) and the motor shaft (2).

9. A planetary geared hub motor according to claim 8, characterized in that: The planetary carrier (41) includes an upper carrier body (411) and a lower carrier body (415). The upper carrier body (411) is fixedly installed on the upper part of the lower carrier body (415). The sun tooth (42) and each of the planetary teeth (44) are respectively disposed between the upper carrier body (411) and the lower carrier body (415). The upper part of the upper carrier body (411) is provided with an upwardly protruding carrier connecting protrusion (412). The carrier connecting protrusion (412) is rotatably connected to the upper end cover (15). The external sealing bearing (18) located on the upper part of the motor shaft (2) is disposed between the upper end cover (15) and the carrier connecting protrusion (412). The frame connecting protrusion (412) has a frame through hole (413) that passes through the upper frame (411). The inner wall of the frame through hole (413) is provided with a keyway (414). The motor shaft (2) is provided with a connecting key (23) at the position corresponding to the keyway (414). The connecting key (23) is embedded in the corresponding keyway (414).

10. A planetary geared hub motor according to claim 2, characterized in that: The lower end face of the upper end cover (15) is provided with a downward protruding upper connecting ring (151), and the upper end face of the lower end cover (16) is provided with an upward protruding lower connecting ring (161). The upper connecting ring (151) is inserted into the deceleration mounting cavity (13), and the lower connecting ring (161) is inserted into the drive mounting cavity (14). The outer side walls of the upper connecting ring (151) and the lower connecting ring (161) are respectively provided with annular sealing grooves (17). Each annular sealing groove (17) is embedded with a sealing ring (171). The two sealing rings (171) protrude from the outer side walls of the upper connecting ring (151) and the lower connecting ring (161), and the two sealing rings (171) abut against the inner walls of the deceleration mounting cavity (13) and the drive mounting cavity (14), respectively. The outer shell (1) is fitted with a tire (5), and one end of the tire (5) is provided with a connecting surface (51). The connecting surface (51) is connected to the upper end cover (15) or the lower end cover (16) by screws.

Images