66results about How to "Reduce axial size" patented technology

The utility model discloses an integrated joint module and robot relates to motor technical field, and the integrated joint module includes: casing, motor, planetary gear reduction box, encoder and drive control board, the casing is the tubular structure, the motor is used to provide power, and the motor includes stator, rotor and rotation axis, and the stator is hoisted in the top inside casing, and the rotor rotatably sets up inside casing, and is located stator outside, and rotation axis is connected with the rotor, and its outer periphery is provided with the tooth, the planetary gear reduction box sets up in stator inside, and including fixedly installed inside stator's inner tooth ring, the planetary wheel that engages in the inner tooth ring with rotation axis between and the planetary wheel connection's planet carrier, the encoder includes the first encoder for monitoring rotation axis and the second encoder for monitoring planet carrier, and drive control board is located in casing, and is connected with motor. Such setting, can reduce the size of joint structure, realizes double magnetic encoder output configuration simultaneously, improves its output accuracy.

The utility model relates to an electromagnetic actuator. The electromagnetic actuator comprises an electromagnetic field generator, a permanent magnet, an armature, a front magnetic pole and a rear magnetic pole, the front magnetic pole and the rear magnetic pole are located at the two axial ends of the electromagnetic field generator respectively, and the armature is installed on the radial inner side of the electromagnetic field generator. The armature can be driven by electromagnetic force of the electromagnetic field generator to axially move between a first limit position and a second limit position, the armature abuts against the front magnetic pole at the first limit position and abuts against the rear magnetic pole at the second limit position, and the front magnetic pole and the rear magnetic pole can be magnetized by the permanent magnet to generate magnetic attraction force for attracting the armature. The electromagnetic actuator further comprises a front elastic buffering piece and / or a rear elastic buffering piece, when the armature is located at the first limit position, the armature and the front magnetic pole compress the front elastic buffering piece in the axial direction, and when the armature is located at the second limit position, the armature and the rear magnetic pole compress the rear elastic buffering piece in the axial direction. The electromagnetic actuator provided by the utility model has an improved structure.

This utility model's electric mining truck gearbox features a three-speed design that allows selection of the most suitable gear based on different working conditions, optimizing power output to meet the power requirements of mining trucks, increasing the coverage of the motor's high-efficiency zone, improving the overall efficiency of the gearbox, and effectively reducing energy consumption. Based on the powerful performance provided by the multi-motor configuration, it enhances the flexibility and efficiency of the drive system. The front intermediate shaft assembly is coaxially connected to the output end of the power coupling assembly, and the rear intermediate shaft extends into the front intermediate shaft assembly and is coaxially aligned with the output end of the power coupling assembly, forming a compact parallel shaft structure. This fully utilizes the radial space of the gearbox and reduces its axial dimensions, thereby reducing the gearbox's volume and facilitating overall vehicle layout. Furthermore, the front and rear intermediate shaft assemblies share the radial and axial loads during transmission, reducing gear stress and improving the transmission stability and reliability under harsh working conditions, thus enhancing the gearbox's adaptability to various operating conditions.

This application relates to the field of machining technology, and discloses an ultrasonic tool holder, ultrasonic machining equipment, and machine tool. The ultrasonic tool holder includes: a tool body and a connecting sleeve. The tool body has a second end and a first end arranged opposite to each other in a front-rear direction. The first end is adapted to be connected and fitted with a spindle, and the second end has a mounting cavity for accommodating a transducer. A wireless receiving unit is provided on the outer periphery of the tool body. The connecting sleeve is connected to the second end and arranged coaxially with the tool body. An outer shell is fitted onto the outer periphery of the connecting sleeve through a bearing, wherein the inner diameter of the bearing is less than or equal to the outer diameter of the second end. Therefore, by placing the bearing between the connecting sleeve and the outer shell, the bearing does not occupy the outer periphery space of the tool body, which reduces the axial dimension of the tool body, thereby improving the rigidity of the tool body and reducing the overall axial dimension of the ultrasonic tool holder. It also increases the structural dimensions of the transducer and reduces the radial dimension of the bearing, thereby improving ultrasonic machining performance.

The utility model relates to wind power generation technical field discloses wind power generation device, including support subassembly, wind wheel subassembly and power generation subassembly, wind wheel subassembly includes main shaft and impeller, and the main shaft fixed mounting is in support subassembly, and the impeller rotatablely installs on the main shaft, power generation subassembly includes first power generation unit and second power generation unit, and the stator of first power generation unit and second power generation unit all fixed mounting is in main shaft, and the outer rotor of first power generation unit and second power generation unit all are connected with the impeller fixedly, the utility model under the same wind force condition, first power generation unit and second power generation unit can work simultaneously, and the mechanical energy of impeller capture is more efficient, more fully converts into electric energy, effectively increases the overall power generation, improves the wind energy utilization efficiency and power generation efficiency, solves when the outside wind speed is at the low level, and the overall power generation of generator is insufficient.

The utility model belongs to the technical field of agricultural machinery, and relates to an agricultural machinery gearbox which comprises an input shaft, a driving transmission mechanism, a steering transmission mechanism and a planetary differential mechanism, a first hydrostatic transmission device and a second hydrostatic transmission device are arranged outside a gearbox body of the gearbox in parallel, and a main input gear is arranged on the input shaft. A first hydrostatic transmission input gear and a second hydrostatic transmission input gear are meshed with the two sides of the main input gear respectively, an input shaft of the first hydrostatic transmission device is in spline connection with the first hydrostatic transmission input gear, and an output shaft of the first hydrostatic transmission device is in spline connection with the driving input gear. An input shaft of the second hydrostatic transmission device is in spline connection with the second hydrostatic transmission input gear, and an output shaft of the second hydrostatic transmission device is in spline connection with the steering input gear. The agricultural machinery gearbox has the advantages of being compact in structure, reasonable in layout, fast in output response and the like.

The utility model relates to the technical field of brake, provide a kind of double-end brake power-off brake, comprising: flange, two flanges are arranged side by side, and two flanges are fixedly connected;Stator, it is slidably arranged between two flanges;Rotor, rotor is provided with two, and is divided and arranged in the both ends of stator;Dynamic plate, it is slidably arranged between stator and one of rotor;And pressure spring, it is arranged between stator and dynamic plate.The utility model compared with prior art, the utility model only needs to set dynamic plate in one end of stator, and omits the dynamic plate of the other end of stator, it is favorable to reduce brake axial dimension, so that structure is more compact.

This application discloses a vertical canned motor pump, belonging to the field of fluid machinery technology. A pump inlet is located at the bottom of the casing, and a pump outlet is located on its side wall. A gland is located at the top of the casing, and an exhaust pipe is provided on the gland. An impeller is located inside the casing and near the pump inlet. A drive unit is located inside the casing. A through shaft passes through the drive unit and drives its rotation. The impeller is fixed to the through shaft, which has an axially extending central hole that communicates with the exhaust pipe. A first bearing assembly and a second bearing assembly are respectively located on opposite axial sides of the drive unit. The first bearing assembly has an exhaust structure. This application reduces the axial dimension and weight of the pump unit by integrating the radial bearing and thrust bearing. Simultaneously, by providing an exhaust structure, the gas accumulated inside the first bearing assembly is discharged in an orderly manner, effectively suppressing vibration and improving acoustic performance.

The application discloses a robot, a neck structure of the robot and a motion control method of the robot. The neck structure of the robot is connected between a head and a body of the robot, and comprises a base for connecting the body of the robot, a top base for connecting the head of the robot, a connecting rod unit rotatably connected between the base and the top base, a driving unit for outputting driving force, and a transmission mechanism arranged between the base and the top base. The transmission mechanism transmits the driving force of the driving unit to the base and / or the top base to drive the head to rotate, pitch and extend outward. The driving unit and the transmission mechanism are one-to-one arranged in three sets. Each transmission mechanism comprises a first transmission unit and a second transmission unit. The first transmission unit transmits the driving force of the driving unit to the second transmission unit to make the second transmission unit extend and retract. The driving unit is located outside the second transmission unit. The neck structure of the robot can drive the head of the robot to rotate, pitch and extend outward, so that the bionics degree of the robot is improved.

This utility model belongs to the field of vehicle technology, specifically relating to a drive structure, an electric drive system, and a vehicle. The drive structure includes: an integrated motor comprising a stator, an outer rotor, and an inner rotor, the stator being located between the outer rotor and the inner rotor, the stator having an outer coil and an inner coil, the outer coil being located inside the outer rotor and the inner coil being located outside the inner rotor; and a transmission assembly connected to the outer rotor and the inner rotor, and respectively connected to the wheels on both sides of the vehicle body.

The double-motor coaxial electric drive axle comprises two motors, two groups of planetary gears, a differential and half shafts assembled at left and right ends of the differential, the motors, the planetary gears, the differential and the half shafts are coaxially arranged, characterized in that the two groups of planetary gears are symmetrically arranged at left and right sides of the differential, left and right ends of a differential case of the differential are respectively connected with output ends of the planetary gears through clutches, the output end of one group of planetary gears is assembled with a differential lock assembly capable of locking the differential function of the differential, and the input end of each group of planetary gears is connected with a shaft end of one motor. The double-motor coaxial electric drive axle can reduce the axial size of the electric drive axle, reduce the unsprung mass, be compatible with more application vehicle models, balance the load dynamic distribution of the double motors, reduce the average energy consumption, improve the endurance mileage, improve the passing performance and improve the adaptability of the vehicle to complex road conditions.

The utility model belongs to the technical field of medical instruments, and particularly relates to an artificial implant support which is provided with a plurality of support connecting holes used for being connected with a valve leaflet mechanism. The bracket connecting hole is a rectangular hole; the artificial implant stent comprises an outflow section, the outflow section comprises a plurality of outflow section frame units and a plurality of outflow section connecting areas, the outflow section frame units are sequentially connected end to end, and the outflow section connecting areas serve as stent connecting parts and are provided with stent connecting holes. The support connecting holes are rectangular holes, compared with a plurality of round holes, sewing of a plurality of circles of sewing lines is easier, and separation of the valve leaflet mechanism and the artificial implant support caused by fracture of the sewing lines is prevented. In addition, the design of the rectangular hole has enough space, so that the connecting piece of the valve leaflet mechanism penetrates out of the outer side of the artificial implant stent from the inner side of the artificial implant stent through the stent connecting hole.

The application relates to the technical field of grinding equipment, and particularly discloses an electric tool output shaft mandrel positioning grinding equipment. The electric tool output shaft mandrel positioning grinding equipment comprises a spindle box and a grinding device, the spindle box is provided with a spindle, the spindle is provided with a self-centering clamping mechanism, the grinding device comprises a rack, a first driving device and a second driving device, the rack is provided with a rotating disc through a hollow shaft base, a plurality of sliding grooves are arranged on the rack, sliding seats are arranged in the sliding grooves, hollow guide pins and axles are arranged on the sliding seats, and a grinding wheel and a driven wheel are arranged on the axles; a guide groove matched with the hollow guide pins is arranged on the rotating disc, the rotating disc is driven by the second driving device, and all the driven wheels are driven by the first driving device. When fine grinding is carried out, the grinding wheel simultaneously works around the output shaft mandrel, the circumferential grinding cutting forces on the output shaft mandrel are offset, and the problems of position deviation, bending deformation and machining vibration caused by unilateral force on the output shaft mandrel are avoided, and the fine grinding precision is obviously improved.

The application discloses a motion control system of a robot flexible joint module based on double encoders, and the flexible joint module comprises a drive controller, a motor, a first encoder and a second encoder. The drive controller comprises a communication module, a control module and an intelligent drive module which are sequentially connected. The intelligent drive module is electrically connected with the motor. The first encoder and the second encoder are both connected with the control module through the communication module. The intelligent drive module detects three-phase current and bus voltage of the motor and sends them to the control module. Meanwhile, the intelligent drive module receives and amplifies the control signal output by the control module to drive the motor to move. The control module runs a flexible joint motion control algorithm according to the position information of the motor end and the load end, the three-phase current of the motor and the bus voltage, and outputs the control signal to the intelligent drive module. The application has the advantages of small structure size, easy use and high positioning accuracy of the joint.

This invention discloses a gas-liquid separator and separation method suitable for high-pressure air. The gas-liquid separator mainly consists of a hydrocyclone blade assembly, an inlet pipe, a left shell, a right shell, a water-blocking ring, an outlet pipe, an intermediate pipe, and a drain nozzle. The hydrocyclone blade assembly consists of a stator hydrocyclone blade, a moving hydrocyclone blade, a bearing, a bushing, and a nut. The moving hydrocyclone blade is mounted on the shaft of the stator hydrocyclone blade via the bearing and bushing. After the high-pressure humid air passes through the hydrocyclone blade assembly, the saturated droplets are thrown to the wall of the inlet pipe by the swirling action, and then discharged through the drain nozzle after passing through the labyrinthine path between the inlet pipe and the shell. The dry air after liquid separation is discharged through the outlet pipe. This invention generates secondary swirling through the moving hydrocyclone blade in the hydrocyclone blade assembly, which causes secondary separation of droplets in the air that were not separated. The labyrinthine path makes it difficult for the separated droplets to flow back, and the dry air improves its original flow direction after secondary swirling, resulting in less air leakage and achieving high dehumidification and separation efficiency.

The application provides a rotor displacement detection sensor assembly and a motor. The rotor displacement detection sensor assembly comprises a measured rotor, a sensor probe and a compensation probe. The measured rotor comprises an axial detection position. The sensor probe is arranged at the radial outer side of the axial detection position and opposite to the axial detection position in the radial direction. The compensation probe is arranged at the radial outer side of the measured rotor and does not oppose the axial detection position. The direction along the central axis of the measured rotor is the Z-axis direction. The direction perpendicular to the Z-axis and passing through the center of the sensor probe is the X-axis direction. According to the application, the displacement signals in the X and Z directions can be output simultaneously, the detection precision is high, and the precision is high.

The utility model discloses a kind of connection structure of automobile power steering controller, the end of the shell of motor is equipped with convex part, the side of convex part is located on shell and forms gluing area, first connecting end is equipped on motor and protrudes convex part, PCBA board is set on convex part, and it is equipped with through-hole for first connecting end to pass through, and second connecting end connected with first connecting end, end shell is set on shell, and after end and shell abut, the side wall between convex part is formed and is contained cavity, sealing glue layer is bonded in contained cavity.The utility model is formed with convex part on the shell of motor, and the gap between the side wall of convex part and the inner wall of end shell forms contained cavity for filling sealing glue, without setting sealing glue groove on the shell of motor to simplify the structure of motor, and increase the area of PCBA board, can reduce product overall axial dimension, realize light weight.

The application discloses a novel lifting massage head structure, a massage machine core and a walking massager, which comprise a first transmission rod, a second transmission rod, a massage head, at least one adjusting piece, a stop structure and a limiting piece. The second transmission rod is sleeved on the periphery of the first transmission rod, is in circumferential linkage with the first transmission rod and is in axial sliding fit. The massage head is fixed to one end of the second transmission rod. The adjusting piece and the second transmission rod structure are in multi-stage mutual thread nesting. The multi-stage adjusting realizes the superposition of the lifting stroke of the massage head. In the same lifting height requirement, the axial size when a single screw rod is used can be effectively shortened. The multi-stage adjusting pieces can be mutually stored and nested in the non-working state, the overall volume and the occupied space of the equipment are greatly reduced, the use is facilitated, and the material cost and the machining cost are reduced.

This invention provides a planetary gear system and a vehicle, relating to the field of vehicle technology. The planetary gear system includes a drive unit, a first planetary gear set, a second planetary gear set, a first driveshaft, and a second driveshaft. In the first planetary gear set, one of the first sun gear, the second sun gear, and the first planet carrier constitutes a first input terminal, and the other two constitute first output terminals. In the second planetary gear set, one of the third sun gear, the fourth sun gear, and the second planet carrier constitutes a second input terminal, and the other two constitute second output terminals. The first input terminal is driven by the drive unit, the two first output terminals are driven by the first driveshaft and the second input terminal, respectively, and one of the two second output terminals is driven by the second driveshaft, while the other is connected to a stationary component of the planetary gear system. Thus, by using two tandem WW planetary gear sets to achieve an integrated differential reduction design, the power system structure becomes more compact and occupies less space.

The utility model discloses a modularized robot joint module with a stepless speed changing and reducing mechanism, and belongs to the technical field of humanoid robot transmission mechanisms. The assembly comprises a machine shell, a stepless speed changing and reducing mechanism is arranged in the machine shell, a ring gear is fixed to the upper surface of the machine shell, a gear ring is fixed to the ring gear, and a driving disc is rotationally installed in the gear ring. The stepless speed changing and reducing mechanism comprises a variable-pitch first bevel gear, a variable-pitch second bevel gear, a driving motor, an H-shaped driving rod, an electric push rod, a traction ring and a planetary gear train composed of driving teeth, a planetary gear and a ring gear, wherein the variable-pitch first bevel gear and the variable-pitch second bevel gear are meshed. Stepless continuous adjustment of the total transmission ratio can be achieved, different working conditions of high-speed light load, low-speed heavy load and the like of the humanoid robot can be flexibly adapted, stability, bearing capacity and transmission precision of power transmission are effectively improved, transmission loss is reduced, and smoothness and reliability of operation of joints of the robot are guaranteed.

The application provides a power assembly and an electric vehicle. The power assembly comprises a motor housing and a first housing. A motor shaft of a driving motor is used to drive connection of a planetary gear set of a planetary reducer. The first housing is used to enclose an opening of the motor housing. End windings of a stator along an axial direction of the power assembly are exposed to one side of a stator core of the stator. The end windings are circumferentially arranged around an outer periphery of the motor shaft of the driving motor along a circumferential direction of the power assembly. The first housing along the axial direction of the power assembly is recessed to form a groove towards an inner side region surrounded by the end windings. A slot of the groove is away from a rotor of the driving motor. The groove is used to accommodate the planetary gear set of the planetary reducer. The design of the groove makes the first housing fully utilize the space along the axial direction and the inner side of the end windings along the radial direction of the power assembly. Also, the planetary gear set can reuse part of the axial space and the radial space of the inner side of the end windings. The axial dimension of the power assembly is small, which is beneficial to the miniaturization of the power assembly and optimizes the overall vehicle layout.

The utility model belongs to motor technical field discloses a thin type direct current brushless outer rotor motor, including the casing, the casing is the open cylinder of one end, the coaxial line is placed in the fixed shaft of casing, the coaxial line is placed and is equipped with the stator core of outside sleeve of shaft, the magnetic strip is fixed on the casing inside peripheral wall, the end cover is equipped with the open end of casing, the end cover is the disc -shaped of inside hollow, and the end cover is close to the open -mouthed of casing end, and the open end of casing is inlaid into the inside of end cover, the stator core is fixedly connected with the end cover, and the one end of shaft is passed through the end cover and is connected with the end cover rotation, the outside peripheral wall fixed support of end cover open end, and the support is located between the two ends of end cover and casing along the shaft axial direction and is away from each other, effectively reduced the thickness of motor along the shaft axial direction, realized the design of motor structure thin type.

This application provides a compressor, including a housing and a crankshaft, a moving scroll, and a stationary scroll respectively disposed therein. The moving scroll meshes with the stationary scroll. An eccentric receiving groove is provided at the end of the crankshaft, parallel to the centerline of the crankshaft. At least a portion of the moving scroll is inserted into the eccentric receiving groove, and a first bearing is disposed between the moving scroll and the eccentric receiving groove. The compressor also includes a support frame located below the moving scroll, with an installation channel provided within the support frame. At least a portion of the crankshaft passes through the installation channel, and a second bearing is sleeved on the crankshaft, fitting against the wall of the installation channel. A lubrication return portion is provided within the installation channel, opposite to the outer peripheral wall of at least a portion of the crankshaft. Along the radial direction of the crankshaft, the orthographic projection plane of the first bearing coincides with the orthographic projection plane of the second bearing. This solves the technical problems of redundant shaft structure, dispersed lubrication paths, and poor motion stability in related scroll compressors.

A gearbox output assembly, relating to the field of gearbox technology, includes a housing, an output shaft, a planetary carrier, a radial support bearing, and two axial support bearings. The planetary carrier is sleeved around the output shaft, and the planetary carrier and output shaft are fixedly connected. The planetary carrier and output shaft are rotatably fitted to the housing via the radial support bearing and the two axial support bearings. The two axial support bearings are spaced apart along the axial direction of the output shaft. The radial support bearings are supported between the housing and the planetary carrier or between the housing and the output shaft, and their rotation axes are parallel to the axis of the output shaft. The two axial support bearings are respectively supported between the housing and the planetary carrier and between the housing and the output shaft, with each axial support bearing having an angle with the axis of the output shaft. At least one bearing overlaps with the planetary carrier along the axial direction of the output shaft. This design reduces axial dimensions, overall size and weight, and manufacturing costs.

The application provides a flat compact generator, and belongs to the technical field of generators, which solves the problems of large volume, complex structure and low heat dissipation efficiency of the existing generator. The generator comprises a front end cover, a casing, a rear end cover and a rear cover cover. The outer part of the front end cover is provided with an air outlet mesh cover. The outer part of the upper end of the casing is provided with a wiring board and a wire outlet box. The inner side of the wire outlet box is provided with an automatic voltage regulator. The inner part of the casing is fixedly provided with a main stator. The front end of the rear end cover is provided with an excitation stator. The rear cover cover is arranged at the rear end of the rear end cover. The inner part of the rear end cover is provided with a bearing. The inner ring of the bearing is fixedly provided with a main shaft. A plurality of closely arranged disc couplings and a locking plate are sequentially arranged on the front end surface of the main shaft from back to front by locking screws. A heat dissipation fan blade, a main rotor and an excitation rotor are sequentially arranged on the main shaft from front to back. The rear side end surface of the excitation rotor is provided with a rectifier bridge. The application realizes flat and compact design, and optimizes the smoothness of the internal cooling air duct to improve the heat dissipation efficiency.

The utility model discloses a longitudinal front -drive hybrid transmission, include: input shaft, generator, drive motor, first gear mechanism, shift mechanism, first shift gear group, second shift gear group and power output mechanism, and the rotor of generator is connected with the rotor of input shaft through engine, and the clutch is set up in the rotor of generator, and the rotor of drive motor is connected to one end of clutch, and the rotor of drive motor is connected to the other end of clutch, the coaxial setting of generator and drive motor is connected with shift mechanism through the motor shaft of drive motor with first gear mechanism, and first shift gear group and second shift gear group are connected with power output mechanism. The utility model provides longitudinal front -drive hybrid transmission, sets up the clutch in the rotor of generator, does not occupy transmission axial dimension, further reduces transmission volume, can satisfy longitudinal car type four -drive in the front axle power generation and drive function, has realized higher power integration design and small -size design.

The application provides a joint module, comprising an axial flux motor, a speed reduction transmission module and a sensing device arranged integrally along the same rotation axis; the speed reduction transmission module is embedded in the internal radial position of the axial flux motor, and the sensing device is arranged on the top or bottom of the axial flux motor; the axial flux motor comprises a stator assembly and a rotatable rotor assembly; the input end of the speed reduction transmission module is in transmission connection with the rotor assembly; the sensing device is connected with the output shaft of the speed reduction transmission module, and is used for collecting the actual rotation position and speed information of the output end in real time, so as to realize full closed loop control of the output end. The axial flux motor, the speed reduction transmission module and the sensing device are coaxially nested and integrated along the same rotation axis, the central installation space in the axial flux motor is fully utilized, the speed reduction transmission module is embedded in the internal space, space multiplexing is effectively realized, and the sensing device is arranged on the top or bottom of the motor, so that the axial structure is not additionally lengthened.

The application discloses a planetary row structure for a hybrid power assembly and a hybrid assembly, relates to the field of hybrid electric vehicle transmission, and comprises a shell, an engine input shaft and a motor input shaft are arranged in parallel in the shell, a planetary carrier is fixedly connected to the engine input shaft, a planetary gear is rotatably installed on the planetary carrier, a transmission gear one is arranged on the motor input shaft, the transmission gear one is in meshing connection with a transmission gear two arranged on an intermediate shaft, a sun gear is fixedly connected to the intermediate shaft, the sun gear is in meshing connection with the planetary gear, and a ring gear for power output is further arranged. The application compresses the axial space of the planetary row structure, improves the compactness of system arrangement, arranges the engine input shaft and the motor input shaft in parallel, adopts the ring gear with inner and outer tooth structures as a direct power output component, shortens the axial dimension of the planetary row assembly, and makes the planetary row assembly more easily integrated in the hybrid electric vehicle power assembly with limited space.

The application discloses a light and efficient through-shaft type wheel hub motor, which comprises a through-shaft, a wheel hub shell mounted on the through-shaft, a machine core, a planetary reduction mechanism and a clutch which are sequentially assembled along the through-shaft, the clutch comprises an outer ring and an inner ring, the inner ring is fixed on the through-shaft, the planetary reduction mechanism comprises a sun gear arranged on an output end of the machine core and a plurality of planetary gears, the planetary gears are arranged on planetary shafts, the planetary shafts are fixed to the outer ring of the clutch, the sun gear is in transmission connection with a ring gear fixed to the inner side of the wheel hub shell through the planetary gears, and the planetary gears are double planetary gears, the double planetary gears comprise coaxially arranged large and small gears, the large gear is a plastic gear and is in mesh with the sun gear, the small gear is a metal gear and is in mesh with the ring gear, and an extension shaft sleeve is integrally arranged at the center of the small gear to fix the large gear. The through-shaft type wheel hub motor can ensure high output power and good internal structural strength under the premise of reducing weight, and the volume is further reduced.