56results about How to "Reduce radial size" patented technology

The blood pressure measuring device comprises a base, an arc-shaped bearing part, a fixed air bag cuff, a movable air bag cuff and a combined telescopic mechanism, the arc-shaped bearing part is arranged in the base, the fixed air bag cuff is fixed in the arc-shaped bearing part, one end of the movable air bag cuff is fixed at a fixed position in the base, and the other end of the movable air bag cuff is fixed at a fixed position in the base. The power mechanism and the execution mechanism of the second extension mechanism are separately arranged, the heavy power mechanism is allowed to be installed on the base, and the load of the first extension arm can be reduced.

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 discloses an upper cross beam structure of a closed four-point high-speed precision press, which comprises an upper cross beam, the upper cross beam is of a symmetrical structure, two ends of the upper cross beam are respectively provided with a mounting hole, each mounting hole is respectively provided with a first sliding bearing seat, and at least one mounting hole is provided with a flywheel seat; a first installation seat is arranged in the middle of the upper cross beam, a second installation seat is detachably arranged on the first installation seat, lower bearing seats are arranged at the two ends of the first installation seat respectively, upper bearing seats are arranged at the two ends of the second installation seat respectively, and each upper bearing seat and the corresponding lower bearing seat form a second sliding bearing seat. According to the technical scheme, the upper cross beam is of a unique split type structure, and the first installation base and the second installation base are connected through the attached installation planes and the bolts. On one hand, machining is facilitated, and the overall machining difficulty is reduced; and on the other hand, when the precision deviation of the hole system is detected, fine adjustment can be carried out by repairing the mounting plane.

This invention discloses a coaxial dual-cavity optical detection system, relating to the field of gas detection, which solves the problems of poor portability and low laser utilization in existing equipment. The system includes an air inlet, two coaxially arranged cavities with the inner cavity located inside the outer cavity, a vent, an outlet, a plano-concave mirror, and symmetrical window mirrors. The two cavities are interconnected through the vent, allowing for gas filling and exhaust with a single gas path. Coaxial parallel plano-concave mirrors are installed within the cavities, working in conjunction with an external reflector, convex lens, and detector to guide refracted light incident on the inner cavity into the outer cavity for utilization, forming a closed loop in the optical path of the two cavities. This system significantly reduces longitudinal and lateral dimensions, improving portability; simultaneous dual-cavity detection improves detection accuracy; the utilization of refracted light enhances laser utilization and sensing efficiency; and the increased effective optical path within a limited volume improves gas detection sensitivity, making it suitable for trace gas detection.

The invention discloses an ineffective potential suppression structure for a small inductosyn, and belongs to the technical field of inductosyn. The invention aims at the application requirements of high precision and small size of the inductosyn. A stator effective conductor of the inductosyn is arranged on the front surface of the stator substrate and is arranged along the whole circumference of the stator substrate; a stator substrate and a rotor substrate of the inductosyn are made of ferromagnetic materials. Stator ineffective conductors of the inductosyn are arranged on the back face of a stator substrate and are arranged along the whole circumference. The stator non-effective conductor and the stator effective conductor are connected through dense via holes; a stator effective conductor and a rotor conductor of the inductosyn are arranged in a radial alignment manner. According to the stator design scheme based on the double-layer metal-based MCPCB, the ferromagnetic material is used for improving the signal strength and shielding the ineffective potential, the precision and the signal-to-noise ratio are improved, meanwhile, the radial and axial space occupation is reduced, and the application requirement of the induction synchronizer in a small precise servo system is met.

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 discloses a novel rotary pipeline robot structure relates to robot technical field, including initiative knot, the initiative knot is provided with battery knot and control knot, the initiative knot, battery knot and control knot are connected through the connector between, initiative knot: contain initiative knot mounting bracket, first locking screw, initiative wheel frame, initiative wheel, initiative knot shell, second locking screw, rear initiative wheel frame, rear initiative wheel, third locking screw and double -output shaft drive motor, the surface of initiative knot mounting bracket is sleeved with initiative knot shell, the left and right two ends of initiative knot shell are fixed in the left and right two ends of initiative knot mounting bracket surface through the second locking screw of uniform distribution, the inside installation of mounting bracket has double -output shaft drive motor, the left and right sides of initiative knot mounting bracket inside are provided with initiative wheel frame and rear initiative wheel frame respectively, simple and reliable structure, and the two functions of equipment walking and shock attenuation are realized simultaneously to all -in -one wheel frame.

The application relates to the field of high-end equipment manufacturing technology, in particular to a large-size shaft end nut locking anti-loosening structure and method. The anti-loosening structure comprises a snap ring fixed in the circumferential direction of a main shaft, a locking nut abutting against the end face of the snap ring and a limiting pin. The bottom of the limiting pin abuts against an elastic pad, and the top of the limiting pin protrudes from the end face of the snap ring. A plurality of pin holes are formed in the locking nut. When the locking nut is screwed on the main shaft close to the snap ring, the limiting pin is axially compressed and moves close to the side of the elastic pad along the groove. When the locking nut abuts against the snap ring, the limiting pin is embedded in the pin hole under the elastic force of the elastic pad, the reverse rotation of the locking nut is limited, the size of the axial pre-tightening force of the wheel hub bearing is stabilized, the bearing clearance of the wheel hub bearing is kept within the set value, the mechanical performance of the wheel hub bearing unit is improved, the service life of the wheel hub bearing unit is prolonged, and the driving safety of the automobile is improved.

This invention discloses a multi-motor drive system, a control method for the multi-motor drive system, and a vehicle. The multi-motor drive system includes a drive motor, a planetary transmission structure, a first input shaft, a second input shaft, a third input shaft, an output shaft, and a locking structure. The first motor and the second motor are respectively connected to the planetary transmission structure via the first and second input shafts, and the planetary transmission structure is connected to the output shaft. The third motor is connected to the output shaft via the third input shaft. The locking structure controls the transmission ratio of the drive motors. The first motor, the second motor, and the third motor are coaxially arranged. This invention provides a compact multi-motor drive system.

The application discloses a kind of optical fiber ribbon bunching processing device and bundle structure coiled optical fiber ribbon cable, it is related to optical cable production technical field, its technical scheme main point is: including pay-off stranding mechanism, pay-off stranding mechanism includes vertical frame, carousel assembly, stranding head and stranding die, the rotation axis of carousel assembly is perpendicular to ground setting;Carousel assembly includes stranding drive part, center base and extension ring disc, extension ring disc is detachably fixed on the periphery of center base or the periphery of adjacent another extension ring disc;Center base and extension ring disc are respectively provided with a plurality of wire reel racks and are used to drive wire reel rack to untwist untwist drive part, stranding drive part is provided with electric slip ring between center base, and power supply contact is arranged between center base and extension ring disc, and between adjacent extension ring disc.The application can be flexibly, quickly adjusted physical configuration according to actual production demand, to realize the purpose of on-demand driving, energy saving and cost reduction.

The utility model belongs to the technical field of automobile shock absorber, specifically relates to a linear motor shock absorber, which comprises an electromagnetic coil, a permanent magnet, a core shaft and a sleeve outside the electromagnetic coil, one of the electromagnetic coil and the permanent magnet is connected on the outer side wall of the core shaft, and the other is arranged on the inner side wall of the sleeve, further comprises a displacement sensor, the upper end of the sleeve is equipped with a guide sleeve, the lower end of the sleeve is equipped with a lower limit plate, the core shaft is located inside the guide sleeve and protrudes upwards, a first sliding bearing and a sealing ring located on the top surface of the first sliding bearing are arranged between the core shaft and the guide sleeve, the first sliding bearing and the sealing ring are fixedly arranged on the inner side wall of the guide sleeve, and the first sliding bearing and the sealing ring are in sealed contact with the outer side wall of the core shaft and axially slide. The electromagnetic coil and the permanent magnet are always located in the sleeve, the sealing ring and the core shaft are matched to seal the through hole on the guide sleeve, impurities are prevented from entering the sleeve to damage the electromagnetic coil and the permanent magnet, and the working reliability of the linear motor shock absorber is improved.

The utility model relates to a middle connecting plate of a transmission, the transmission and a vehicle, and the middle connecting plate comprises a middle connecting plate body which is provided with a first shaft through hole and a second shaft bearing mounting hole; the first valve plate and the middle connecting plate body are integrally formed, the first valve plate is provided with a first surface, a plurality of oil cavities are formed in the first surface, and the first valve plate is in surface-to-surface fit with the second valve plate. The first valve plate is integrated on the middle connecting plate body, so that the integration level can be improved, and the lengths of the middle connecting plate and the second valve plate in the thickness direction can be shortened; an oil cavity is adopted to replace a slender oil duct, the oil cavity is small in depth, large in size area, better in castability than the oil duct and good in product casting quality, the first valve plate and the second valve plate are matched in a face-to-face mode, the leakage risk is reduced, the number of the oil ducts in the middle connecting plate body is reduced, and the space occupied by auxiliary holes and a plugging structure and the number of plugging parts can be reduced; the overall dimension of the middle connecting plate is reduced, product cost is reduced, and reliability is improved.

The present application relates to a kind of small DMS optical lens, and the optical system of lens is sequentially arranged by first lens, second lens, third lens and fourth lens from left to right along the light path of light incidence, first lens is meniscus positive lens, second lens is meniscus positive lens, third lens is meniscus positive lens, and fourth lens is meniscus negative lens, first lens is glass aspheric lens, second lens, third lens and fourth lens are plastic aspheric lens.The present application adopts four optical lenses, and the optical system is formed by one glass aspheric lens and three plastic aspheric lenses, while meeting the imaging performance requirements of lens, the total length of lens and the radial dimension of each lens are reduced, to achieve the miniaturization of lens group;In addition, a glass aspheric lens is arranged in the first to fourth lens of lens, which can further improve the overall image quality of lens, control temperature drift and improve the influence of high temperature or low temperature on the image quality of lens.

The utility model relates to an inflation pump control box, including box body and a plurality of set up in the inflation pipeline subassembly of box body, and the inflation pipeline subassembly includes air pump, main gas pipe, a plurality of branch gas pipe, silencer and a plurality of air pressure sensor, and air pump is installed in the box body through mounting seat, and main gas pipe is connected with air pump and communicates, and a plurality of branch gas pipe and silencer are installed in the box body through vertical board, and are connected with main gas pipe through air valve door and communicate, and the side of each branch gas pipe away from main gas pipe is installed on the box body through quick detach three ways and is connected with the outside of box body and communicates, and a plurality of air pressure sensor correspond with branch gas pipe, and each air pressure sensor is connected on quick detach three ways of corresponding branch gas pipe through connecting pipe, and communicates with corresponding branch gas pipe through connecting pipe, quick detach three ways, the utility model discloses inflation pump control box is small, can monitor gas pipe pressure.

The utility model relates to the technical field of lifting equipment, in particular to a lifting appliance and a lifting device of a battery pack, the lifting appliance is used for lifting goods with lifting holes or a tray for loading the goods, and the lifting appliance comprises a lifting rod, a hook body and a locking piece; the lifting rod comprises a first end and a second end used for being directly or indirectly connected with a lifting mechanism. The hook body is fixed at the first end of the suspender and convexly extends towards the first side of the suspender; the locking piece is movably arranged on the suspender, the locking piece is constructed to be capable of moving between a first area on the suspender and a second area on the suspender, the second area is the second side of the first end of the suspender, the second side and the first side of the suspender are oppositely arranged, and the first area is the area except the second area on the suspender; when the end, with the hook body, of the lifting appliance is mounted in the lifting hole and the locking piece is located in the second area, the lifting appliance can be limited to be separated from the lifting hole; the lifting appliance provided by the utility model can be quickly mounted and safely locked in a limited space.

The invention discloses a telescopic rotary hydraulic cylinder, and belongs to the technical field of hydraulic cylinders. Comprising a cylinder body and a piston rod which are matched with each other, the revolving bed is fixed at the piston rod end; the rotary rod is rotationally mounted on the rotary seat and is coaxial with the piston rod; the pair of racks are fixed on the rotary seat and are arranged on two sides of the rotary rod in parallel; the ends, away from the rotary seat, of the two racks are fixedly connected with a rotary disc which rotationally sleeves the rotary rod. The gearbox is fixed to one end of the supporting cylinder. The input end of the gearbox is provided with a first straight gear meshed with the rack, and the output end of the gearbox is provided with an outer fluted disc matched with the internal spline of the piston rod. The rack is driven to move through linear motion of the piston rod, the linear motion is converted into rotary motion of the outer fluted disc through the gearbox, and therefore the rotary rod is driven to rotate, linkage of axial stretching and circumferential rotation of the rotary rod is achieved, and an additional motor or a rotary oil cylinder is not needed.

This application discloses a tray assembly and a child seat. The tray assembly, used in the child seat, includes a base, a tray, and an anti-slip mat. The tray is detachably connected to the base. The tray has a first wall and a second wall arranged opposite to each other. The second wall has a connecting structure, which includes a fixing post and a fixing ring. The fixing post, the fixing ring, and the second wall together define an annular space open at one end. The anti-slip mat includes a connecting part and an anti-slip part connected to each other. The connecting part is located within the annular space and has a connecting hole. The connecting hole is interference-fitted with the fixing post so that the anti-slip mat is connected to the tray. The anti-slip part is located outside the annular space and contacts the base. This design prevents the components connecting the tray and the base from detaching from the tray during the user's handling of the tray.

This utility model relates to a deceleration clutch for an agitator washing machine and the washing machine itself, belonging to the field of deceleration clutch technology. It overcomes the deficiency of insufficient support strength of the impeller shaft in high-impact washing machines. The device includes an impeller shaft and a spin-drying shaft. The impeller shaft is supported upper and lower within the spin-drying shaft by movable support member one and movable support member two. Movable support member one is a needle roller bearing and / or a ball bearing, and movable support member two is a needle roller bearing and a thrust bearing or a ball bearing. This design can adapt to the support force requirements of high-impact washing machines, improving the service life of the agitator. The stepped mounting hole not only provides axial limitation but also appropriately reduces the radial dimension of the shaft, lowering costs. A shaft retaining ring improves the installation stability of the impeller shaft. Adjusting shims eliminate axial dimensional errors, reducing production costs.

The utility model discloses a booster suitable for a photovoltaic tracking system, which relates to the technical field of photovoltaic tracking and comprises a fixing part, a first connecting part and a second connecting part. The movable part is in rotary fit with the fixed part, and a second combination part is arranged on the movable part; the power assisting unit comprises an elastic part; the elastic part is arranged between the movable part and the fixed part, one end of the elastic part is connected with the fixed part, and the conversion structure is arranged at the other end of the elastic part and located between the movable part and the fixed part; the switching structure comprises a switching part, and the switching part and the elastic part are sequentially arranged in the axial direction of the fixing part; the change-over part is matched with the second combination part to achieve force storage or energy release of the elastic piece, or the change-over part is matched with the first combination part to achieve deformation of the elastic piece. The utility model has the advantages of safety, reliability, high automation degree, strong practicability, smaller radial size, economy and environmental protection.

The invention provides a plunger type static pressure clutch which comprises a static pressure clutch part which comprises a driving end, a transmission end and a driven end with an inner curved surface. A plunger hole and an oil discharge narrow slit are formed in the cavity wall of the driving end, and a pressure oil duct is formed in the oil supply shaft in the cavity; the transmission end comprises an oil inlet disc, and a one-way valve is arranged on the oil inlet disc. The plunger is embedded in the plunger hole, and a pin roller is embedded in the plunger in a rolling mode. The inner cavity is divided into a first chamber and a second chamber by the oil trapping piston; the oil discharge narrow slit is arranged corresponding to the first chamber, and the second chamber is communicated with the pressure oil duct; the oil trapping piston is connected to the cavity through the piston spring. According to the clutch, the torque transmission requirement is met by using the clutch with lighter weight, meanwhile, the combination process of the clutch can be actively controlled, the combination pressure is smoothly increased, and violent impact in the separation and reunion process is avoided.

The utility model discloses a low -power consumption winch sensor based on tunnel magnetoresistance effect, including measurement module, signal conversion unit, casing, mandrel, magnetism carousel and detection component, magnetism carousel is connected with mandrel and synchronous rotation, and detection component includes TMR sensing element and N magnet, and magnetism carousel is equipped for embedding the mounting blind hole of magnet, TMR sensing element is located on the casing, including mounting panel and two sensing units, and the magnetic domain direction of two sensing units is perpendicular to the axis of rotation, and its reluctance signal is converted and is inputted measurement module through signal conversion unit, and the horizontal distance of the center of two sensing units and magnet to the axis of rotation is all R, and the center distance of two sensing units L < R * sin (180 DEG / N), this sensor is based on TMR tunnel magnetoresistance effect, and the detection sensitivity is high, and the energy consumption is low, and its output has the square wave signal of phase difference, can supply measurement module accurate analysis and calculate winch drum speed and steering, and its overall structure is simple, and the radial dimension is small, and is easy to install and control installation accuracy.

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 gear reducer which comprises a sun wheel shaft, a planet carrier and a gear ring. A sun gear is arranged on the sun gear shaft; the planet carrier comprises an internal planet carrier and an output planet carrier, the internal planet carrier is fixedly connected with the output planet carrier, a plurality of planet wheel shafts are arranged between the internal planet carrier and the output planet carrier, and large planet gears meshed with the sun wheel and small planet gears meshed with the gear ring are arranged on the planet wheel shafts; the pitch diameter of the large planetary gear is larger than that of the small planetary gear. The utility model further discloses a joint actuator which comprises a shell, a motor assembly and the gear reducer are arranged in the shell, the motor assembly comprises a stator and a rotor arranged in the stator in a sleeved mode, a center through hole is formed in the rotor, a transmission part synchronously rotating with the rotor is arranged in the center through hole, and the transmission part is in transmission connection with the sun wheel shaft. And the gear ring is fixedly mounted in the shell. According to the joint actuator, the radial size cannot be increased under the condition that the requirement of large transmission ratio is met.

The utility model relates to a kind of handlebar turning device and vehicle, the handlebar turning device includes: support, rotor, first elastic member and second elastic member, the rotor is worn in the support, the rotor can be relative support positive rotation and reverse rotation, the rotor with the support between defined accommodate space, the first elastic member and the second elastic member along the axial spacing arrangement of the rotor in the accommodate space;After the rotor relative support positive rotation, the first elastic member can reset the rotor to initial position, after the rotor relative support reverse rotation, the second elastic member can reset the rotor to initial position.The handlebar turning device of the utility model is favorable for reducing its radial dimension, and the parts in handlebar turning device are not easy to interfere when assembling, and it is favorable for improving assembly efficiency and reliability after assembly.

A kind of water seal type deodorization device for vertical pipeline, long baffle, first short baffle and second short baffle are arranged in the inside of circular tubular body, the upper end of long baffle is flush with the upper end of first short baffle, the lower end is flush with the lower end of second short baffle, the height dimension of first short baffle and second short baffle is greater than the height dimension of long baffle, the lateral side of three baffle is sealingly fixed in the side wall of the hole of circular tubular body, and the hole of circular tubular body is formed into three spaces along the circumference direction, upper cover plate and lower cover plate are respectively sealingly covered in the two ends of circular tubular body, the small arc surface notch enclosed by long baffle, first short baffle and the upper end edge of circular tubular body is water inlet, the small arc surface notch enclosed by long baffle, second short baffle and the lower end edge of circular tubular body is water outlet, water flows into from water inlet, and flows out from the water outlet of lower end, the height difference between the lower end edge of first short baffle and the upper end edge of second short baffle is water seal height, it can effectively prevent odor return.

This invention relates to the field of lens technology, specifically to a miniaturized lens simulation design method and lens structure. The simulation design method includes the following steps: designing a lens structure, which includes a lens barrel and end lenses; linearly fitting tensile strength data obtained from actual experiments to obtain simulation material parameters of the colloid, and establishing a mathematical model of the lens structure; establishing a three-dimensional model of the lens structure based on the mathematical model; importing the three-dimensional model into simulation software; setting the solution conditions for the three-dimensional model and performing simulation. This invention's lens simulation design method performs mechanical simulation on the designed miniaturized lens structure, ensuring that the lens meets the requirements for radial miniaturization while simultaneously verifying the rationality of the overall structure through simulation, thus guaranteeing the lens structure design is qualified.

This utility model discloses an electromagnetic braking device for a tubular motor, comprising a brake housing, an electromagnet, a brake seat, a spring, and a brake disc for connecting to the drive shaft of the tubular motor. The electromagnet is fixed in the brake housing. The brake seat is movably fitted in the brake housing and located between the electromagnet and the brake disc. The brake seat is provided with brake pads. When the electromagnet is energized, it drives the brake seat closer to the electromagnet. The spring is sleeved on the brake seat, with its two ends abutting against the brake housing and the brake seat respectively. The spring is used to drive the brake seat away from the electromagnet. The brake disc is arranged opposite to the brake seat, and the brake disc and the brake pads of the brake seat move in contact. This utility model avoids the spring occupying the radial space of the electromagnet, thereby helping to reduce the radial dimension of the electromagnetic braking device for a tubular motor.

The utility model discloses a coaxial electric drive axle of big reduction ratio and vehicle, including motor, reduction mechanism and differential, reduction mechanism at least includes sun gear, planetary gear assembly, support ring gear and output ring gear, and differential includes rotator and two drive shafts, and planetary gear assembly includes planet carrier and with coaxial connection's first planetary gear and second planetary gear, and the rotor axle of motor is connected sun gear, and sun gear connects first planetary gear and / or second planetary gear, and first planetary gear and support ring gear are engaged, and second planetary gear and output ring gear are engaged, and output ring gear connects rotator, and one drive shaft of differential is arranged in the axle of rotor axle and sun gear's axle center, to guarantee the torque of motor output deceleration, increase the twist after transmission to rotator through reduction mechanism, and then guarantee the torque distribution to two drive shafts, and such can realize big reduction ratio, and the whole radial dimension is small, and cost is low and occupies small space.

This application relates to the field of compressor technology and discloses a centrifugal compressor, comprising: an outer casing having at least one inlet duct and at least one exhaust duct, the inner wall of the outer casing being provided with an exhaust volute; an inner casing assembly installed inside the outer casing, the outer wall of the inner casing assembly and the volute wall defining an exhaust volute chamber, the exhaust volute chamber communicating with the exhaust duct; an end cap installed at the end of the outer casing, the end cap fitting against the end of the inner casing assembly and defining an inlet volute chamber, the inlet volute chamber communicating with the inlet duct; a rotor assembly installed inside the inner casing assembly and capable of rotation, the rotor assembly compressing gas when rotating; a plurality of partitions installed between the inner casing assembly and the rotor assembly, the plurality of partitions and the inner wall of the inner casing assembly defining an airflow channel, the airflow channel communicating with the inlet volute chamber and the exhaust volute chamber; airflow flowing into the inlet volute chamber from the inlet duct, and flowing into the exhaust volute chamber through the airflow channel and then discharged from the exhaust duct.

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.