71results about How to "Reduce the difficulty of assembly process" patented technology

The invention relates to a permanent-magnetic brushless direct current motor which comprises a shell, a front end cover, a rear end cover, a stator, a rotor, and a position sensor, wherein the stator comprises a stator iron core and a winding, the inner side of the stator iron core is provided with a plurality of tooth grooves, the winding passes through the tooth grooves; the rotor comprises a rotating shaft, a rotor iron core and at least one pair of magnetic steels, the rotor iron core is sleeved on the rotating shaft, the magnetic steels are arranged at the periphery of the rotor iron core; and the position sensor comprises a circuit board and a Hall element connected with the circuit board, wherein magnetic conduction inlaid strips used for magnetic conduction are arranged in the tooth grooves of the stator iron core, the cross sections of the magnetic steels of the rotor have an arc shape the thickness at the middle part of which is more than those at both sides, and the Hall element of the position sensor is close to end parts of the magnetic steels of the rotor and takes the magnetic leakage of the magnetic steels of the rotor as a running signal of the Hall element. The permanent-magnetic brushless direct current motor can effectively save production cost and improve the working performance of the motor.

The invention discloses a loudspeaker module, and relates to the technical field of electric-acoustic products. The loudspeaker module comprises a shell. A vibration system and a magnetic circuit system are accommodated in the shell, the vibration system comprises a diaphragm and a voice coil, the diaphragm and the voice coil are combined with each other, an inner cavity of the integral module is divided into a front sound cavity and a rear sound cavity by the diaphragm, the edge of the diaphragm is fixed onto the shell by the aid of an annular support component, and a plurality of cavity extending portions which are formed by means of starving are distributed on the support component at intervals and are communicated with the rear sound cavity. The loudspeaker module has the advantages that the technical problem of increase of resonant frequencies F0 due to narrow rear sound cavities of loudspeaker modules in the prior art can be solved, and the rear sound cavity of the loudspeaker module is large in volume, low in resonant frequency F0, wide in frequency band, good in acoustic performance and long in service life; the loudspeaker module is low in assembling process difficulty and high in production efficiency.

The invention relates to a through-hole connection structure and connection method of a titanium aluminum supercharger turbine impeller and a rotating shaft. The connection structure comprises the rotating shaft, the titanium aluminum turbine impeller and a shaft end locking nut. A through hole is formed in the center of the titanium aluminum turbine impeller. A thread is arranged at the end portion of the rotating shaft. Seen from the end of a turbine, the rotating direction of the thread is the same as the rotating direction of the turbine rotating shaft during working. The lower portion of the thread is the rotating shaft connection portion. The rotating shaft connection portion penetrates through the through hole of the turbine impeller. The rotating shaft connection portion and the turbine impeller through hole are in transition fit or interference fit. The shaft end locking nut is installed on the thread of the end portion of the rotating shaft. As for the connection problem of the titanium aluminum turbine impeller and the rotating shaft, the through-hole connection and threaded locking structure are adopted, the durable and reliable connection between the titanium aluminum turbine impeller and the 42CrMo rotating shaft can be achieved, the requirements for the connection strength of the supercharger turbine impeller and the rotating shaft are met, and meanwhile the connection structure has the advantages of being simple in structure, easy to machine and the like.

The invention discloses a precast beam reinforcement cage component and an assembling method thereof. The precast beam reinforcement cage component comprises a reinforcing steel bar assembly and a disassembly-free mould connected with the reinforcing steel bar assembly, wherein the reinforcing steel bar assembly is formed by connecting a horizontal reinforcing bar and a stirrup, and the disassembly-free mould is laid along the front side surface, the rear side surface and the bottom surface of a precast beam and is connected with the reinforcing steel bar assembly into a whole by virtue of a locating fixed part. The precast beam reinforcement cage component has the advantages that a large component and a reinforced concrete large-structure-space civil building can be realized, a working procedure is simplified, high-altitude operation is reduced, and current national reinforced concrete reinforcing bar specification can be met; meanwhile, cost is reduced, locating and supporting precision, assembling efficiency and quality of a structural component are improved, site construction is convenient, and a technology is controllable.

The invention belongs to the technical field of micro propulsion in aerospace and relates to the MEMS (Micro Electro Mechanical System) technique and the general rocket bipropellant device. A novel liquid bipropellant micro chemical propulsion array is provided by combining the advantages of the current solid and liquid micro chemical propulsion device structures in order to overcome the defects in the prior art. The bipropellant micro chemical propulsion array not only solves the problems on complicated working principle, high requirement of processing and manufacturing technology and low working reliability and the like in the current liquid micro chemical propulsion device, but can simply realize reignition and real-time adjustment of thrusting force and maintain the advantages that the traditional solid micro propulsion system can be distributed in arrays and has high integration level and the like.

The invention discloses an integrated optical circuit structure fiber-optic gyroscope and a work method thereof. The integrated optical circuit structure fiber-optic gyroscope comprises a light source. The light source is connected to a first lens through a first optical fiber. The rear side of the first lens is orderly provided with a first polarizing beam splitter, a Faraday rotating plate, a polarizing film, a second polarizing beam splitter and a second lens. The integrated optical circuit structure fiber-optic gyroscope also comprises an optical fiber ring and a phase modulator connected to the optical fiber ring. The optical fiber ring is connected to the second lens through a second optical fiber and a third optical fiber. Each one of the first polarizing beam splitter and the second polarizing beam splitter comprises two optical axis orthogonal homotaxial birefringent crystals. The integrated optical circuit structure fiber-optic gyroscope also comprises a detector. The detector is connected to the first lens through a forth optical fiber. The integrated optical circuit structure fiber-optic gyroscope is free of a thin special optical fiber and a high-precision optical device online production platform, greatly reduces product assembling process difficulty, guarantees a product precision, improves product reliability and lays a foundation for fiber-optic gyroscope market popularity.

The invention discloses a backlight module and a display device, and belongs to the technical field of display. The backlight module comprises a shell, a plurality of light sources, a light guide plate and a diffusion sheet assembly; a flexible circuit board extending in the first direction is fixedly arranged on the surface of the side, close to the light guide plate, of the back plate, and the light sources are located on the side, away from the back plate, of the flexible circuit board. The diffusion sheet assembly comprises a diffusion sheet, an auxiliary strip and a supporting part, one opposite section of area of the auxiliary strip in the second direction is attached to the diffusion sheet, the other section of area is attached to the supporting part, and the supporting part is supported between the auxiliary strip and the back plate. The display device comprises a liquid crystal display panel and any backlight module which are oppositely arranged. According to the backlight module, a narrow frame can be achieved, the structural part is formed by attaching the auxiliary strips of the supporting parts and used for providing supporting lap joint for the shading adhesive tape,lap joint attachment of the shading adhesive tape can be guaranteed, the light leakage problem of the module can be better solved, the assembling process difficulty is lowered, and the stability of the whole backlight module can be better improved.

The invention discloses a prefabricated floor slab reinforcement cage member, a floor slab, a member assembling method and a floor slab construction method. The prefabricated floor slab reinforcement cage member comprises a bottom mold and a steel reinforcement truss mounted above the bottom mold, wherein the bottom mold comprises a plurality of longitudinal support templates arranged in parallel and a plurality of transverse support templates arranged between every two adjacent longitudinal support templates; the longitudinal support templates are integrally connected with the transverse support templates on both sides; the steel reinforcement truss is formed by connecting reinforcing steel bars arranged above the longitudinal support templates with reinforcing steel bars arranged above the transverse support templates in a cross manner; the steel reinforcement truss is integrally connected with the longitudinal support templates. According to the invention, the assembly of large members and large-structure space buildings can be realized; the working procedure is simplified; the high-altitude work is reduced; the current national code for reinforced concrete reinforcement can be satisfied; the cost is reduced; the assembly efficiency, quality and positioning support precision are improved; the on-site positioning is convenient; the process is controllable.

The invention relates to a method and device for improving repetition frequency of a laser. The method includes the following steps: S1. the laser outputs laser of relatively low repetition frequency, and the repetition frequency of the laser output by the laser is RF; S2. the laser of the relatively low repetition frequency is divided into N paths; and S3. the N paths of laser passes through N optical paths with different delays and are combined. The repetition frequency of the laser after beam combination is equal to N*RF, and generally N>10 can be realized very easily. According to the method provided by the invention, the repetition frequency of the laser is improved outside a resonant cavity, thereby avoiding the repetition frequency from being limited by the cavity length of the resonant cavity. The repetition frequency of an ultrafast fiber laser in the market is generally 100MHz, and through the method, the repetition frequency can be increased to above GHz very easily.

The invention relates to an electromagnetic valve for an automobile braking system, and belongs to the industry of automobiles. A pressing cover is fixedly connected with a main valve seat through four evenly distributed screws, a sealing gasket is arranged between the pressing cover and the main valve seat, the pressing cover, a magnetism-conductive shell body, a coil supporting frame, a table shoulder and the main valve seat are axially compressed in sequence, an inward flanging is arranged at the central hole of the magnetism-conductive shell body, an upper portion inner ring of the magnetism-conductive shell body is in clearance fit with an upper portion outer ring of the magnetism-conductive shell body in the radial direction, a lower portion inner ring of the magnetism-conductive shell body is in clearance fit with an outer ring of a magnetism-conductive gasket in the radial direction, an inner ring of the magnetism-conductive gasket is in clearance fit with an outer ring of the table shoulder, and a large annular groove and a small annular groove are formed in a valve body of the electromagnetic valve. The electromagnetic valve for the automobile braking system has the advantages that the structure is novel, an electromagnetic coil component does not need to be fixed independently, and the cost and assembly process difficulty are obviously lowered while high-pressure sealing performance and magnetism-conductive performance of an electromagnetic circuit are guaranteed. Besides, when a single electromagnetic valve fails to work, the damaged electromagnetic valve can be replaced independently, the failure of an entire HCU assembly is avoided, and the yield of the entire HCU assembly is obviously improved.

The invention discloses a camera module, comprising: a reinforcing plate; at least one circuit board, wherein the circuit board is provided with at least one hollow area and at least one positioning hole attached to the surface of the reinforcing plate; at least one photosensitive chip, wherein the photosensitive chip is attached to the surface of the reinforcing plate through the hollow area on the circuit board; and at least one lens component, wherein the lens component comprises at least one positioning column corresponding to the positioning hole, and the positioning column penetrates through the positioning hole on the circuit board to be attached to the surface of the reinforcing plate so as to assemble the lens component. The invention further discloses an assembly method of the camera module. By adoption of the camera module and the assembly method, the assembly tolerance of the camera module can be reduced to improve the optical performance of the camera module.

The invention relates to a spinning-in pull rod device for a false twist texturizing machine. Six left spinning-in pull rods (5), six right spinning-in pull rods (6) are fixed on a yarn guide base plate device (1) and a guide rail seat device (20); the yarn guide seat plate device (1) and the guide rail seat device (20) are fixed on a lower frame (24) and an upper frame (25) through a base plate (3) and a bracket (4); a yarn guide base plate (9) is connected with a spring steel clamp (2); a yarn guide porcelain (7) is arranged on the yarn guide base plate (9); a slide block (4) is arranged ona pull rod (22), and is in slide connection with a guide rail (10); a swing arm (12) is fixedly connected with the slide block (4) which is provided with a space ring (13) and a sheath (19); the swing arm (12) is provided with a sheath (19) which is provided with a yarn guider (15) and a twist stop (11); and a swing arm guide rail (17) and a clapboard (18) are arranged on a guide rail base plate (16). The spinning-in pull rod device is simple in structure, low in manufacturing cost, convenient to install and regulate, and convenient and reliable to operate.

The invention provides a semi-independent suspension with inclined leaf springs and belongs to the field of automobile engineering. The suspension comprises a frame, a half axle, and two semi-independent suspension devices on the two sides of the frame; the suspension device on each side comprises four inclined leaf springs; the first and fourth inclined leaf springs are symmetrical about the half axle, while the second and third inclined leaf springs are symmetrical about the half axle; the line of intersection of longitudinal symmetrical central planes determined by the first and fourth inclined leaf springs is parallel to or collinear to the line of intersection of longitudinal symmetrical central planes determined by the second and third inclined leaf springs. According to the semi-independent suspension, the wheels on the left and right two sides are directly connected without a hard shaft, and therefore, the semi-independent suspension is better than a traditional non-independent leaf spring suspension in manipulation stability and driving smoothness. Meanwhile, four leaf springs connected in parallel are capable of effectively bearing and alleviating impact to achieve better bearing capability and reliability; in addition, the distance between the bearing centers on the two sides and the steering range of the wheels are increased, and therefore, the whole vehicle is enabled to be better in low-speed flexibility.

The invention discloses an edge pressing mechanism of a high-speed can body stretcher. The edge pressing mechanism of the high-speed can body stretcher is characterized in that a cam follower, an edgepressing push rod, a thrust arm, a follower lever, an edge pressing force arm, an edge pressing slider and an edge pressing sleeve are successively arranged from an edge pressing cam according to a driving chain; a torque shaft is arranged at a turning point for the edge pressing force arm or / and the thrust arm; a first elastic element is arranged for the cam follower to force the cam follower topress tightly the edge pressing cam; and a second elastic element is arranged for the edge pressing sleeve to force the edge pressing sleeve to move in the pressing direction; directions of the forcetransmitted to the follower lever by the first elastic element and the second elastic element are opposite, and a sliding pin at a joint between the follower lever and the edge pressing force arm ismade to be located at the position of one end of an oblong hole. According to the edge pressing mechanism, first, the structure of an original edge pressing mechanism is greatly simplified, and the problem of poor synchronicity of driving of double edge pressing mechanism cams is overcome at the same time; second, maintenance is provided with convenience; and third, the sealing difficulty caused by a previous edge pressing push rod penetrating through an oil separator plate and the problem of serious mutual pollution between oil and emulsion are avoided.

The fuse body in use for 6KV-1000KV AC high voltage current limiting fuse is produced by using materials according to weight portions: red copper : stannum : phosphor : alum = 50-120:1-8:0.5-5:0.1-2. Structure of the fuse body includes basal body and isometric narrow neck composed of isometric circular arcs setup on two sides of the basal body. Long narrow neck composed of concave arc longer than length of isometric circular arc is setup on the basal body. Long narrow necks with intervals are setup between isometric narrow necks. Performances including carrying capacity, cold resistance, hot resistance, and on / off capability of the fuse body are better than performances of fuse body prepared from silver. Specially, it is better result by using overload current under opening mode. Advantages are: low price being as 5% cost of silver, reduced difficulty for assembling technique, lowered requirement on quartz sand and outer porcelain tube, and power consumption.

The invention belongs to the technical field of hydraulic transmission device, and particularly relates to an axial plunger motor which comprises a shell body, a cylinder body, a transmission shaft, an inclined plate, a flow distribution shaft, a slipper assembly and plungers; the transmission shaft and the inclined plate are connected into an integral structure; the shell body and the cylinder body are fixedly connected; the shell body is provided with the inclined plate; the cylinder body is provided with the flow distribution shaft; the inclined plate and the flow distribution shaft are fixedly connected; the cylinder body is provided with a plurality of plunger holes; the slipper assembly is contacted with an inclined face of the inclined plate; the plungers are connected with the slipper assembly and are inserted into the plunger holes. The transmission shaft and the inclined plate become one, so as to realize synchronous rotation; and a flow distribution plate is canceled, a shaft flow distribution scheme is adopted, and thus the shortcomings of a conventional axial plunger motor are overcome.

An automotive double-front-axle structure adopting non-independent oblique leaf spring suspensions comprises a frame, a first front axle, a second front axle and a steering system, wherein each of the two front axles comprises two oblique leaf spring suspensions, an integral axle and a trapezoid steering mechanism; each oblique leaf spring suspension comprises four oblique leaf springs, the first oblique leaf spring and the fourth oblique leaf spring are symmetrical about the axle, and the second oblique leaf spring and the third oblique leaf spring are symmetrical about the axle, and an intersecting line of longitudinal symmetric center surfaces determined by the first oblique leaf spring and the fourth oblique leaf spring is parallel to or collinear with an intersecting line of longitudinal symmetric center surfaces determined by the second oblique leaf spring and the third oblique leaf spring. Compared with a conventional double-front-axle structure adopting non-independent longitudinal leaf spring suspensions, the automobile double-front-axle structure has high bearing capability, the positional parameter variable quantity of wheels can be reduced, the bearing center distance of the leaf springs is increased, and the abnormal wear of the tires is reduced; the wheel steering range is increased, and a whole automobile has better low-speed flexibility.

The invention relates to a thermoelectric component with high efficiency and low cost and the producing technique thereof, which comprises P-type and N-type semiconductor components, an upper baffle and a lower baffle, an upper electrical insulation and heat conducting layer and a lower electrical insulation and heat conducting layer and electrical and thermal insulation materials which are filled in the spare space; wherein, the upper and lower electrical insulation and heat conducting layer is the Al2O3 plating film which is plated on the baffle, and the upper baffle and the lower baffle adopt the block aluminum plate or the copper plate and are made through the etching technology. The invention has the advantages of greatly decreasing the consumption of the semiconductor material, adopting the aluminum plate to substitute the copper plate, lowering cost, simplifying making technology, being suitable for industrialized mass production, and greatly improving the refrigeration and induced thermal efficiency of the semiconductor thermoelectric component.

The invention relates to a double-stator permanent magnetic direct drive generator and an assembly method thereof. The generator comprises a front bearing assembly, a rotor, an inner stator fitting, an outer stator fitting and a rear bearing assembly. The assembly method comprises the following steps of: inserting a guide rod into a top end mounting hole in a rear support of the rotor, and introducing and fixedly connecting the rotor; inserting a guide rod into a middle mounting hole of the rear support of the rotor, and mounting the inner stator fitting; inserting a guide rod into a mounting hole in a generator casing, passing the guide rod through a mounting hole in a rear flange, and mounting the outer stator fitting; mounting the front bearing assembly, and fixedly connecting a turntable of the rotor with the front end of the rotor; and fixedly connecting one end of a front flange with the front end of the generator casing, and fixedly connecting the other end of the front flange with the front bearing assembly. The fan-driven generator provided by the invention is high in output power of unit volume, and the assembly process difficulty and the cost of the large generator are reduced.

The invention discloses a solid laser module of a semiconductor laser pump, relating to the technical field of semiconductor lasers. The solid laser module comprises a split upper shell, a split lower shell, a core assembly positioned between the split upper shell and the split lower shell, a water pipeline which is positioned on the split lower shell and is communicated with the core assembly, and a water nozzle which is positioned on the outer side of the water pipeline and is connected with the water pipeline, wherein the core assembly comprises an outer water sealing piece, an inner water sealing piece, a first sealing rubber ring, a second sealing rubber ring, a fixing structural part and a laser array; the inner water sealing piece comprises an end portion and a hollow cylindrical guide barrel fixedly connected with the end portion; the guide barrel is provided with a plurality of turbulence holes; the outer diameter of the end portion is the same as the diameter of the inner cavity of the fixing structural part; the outer diameter of the guide barrel is smaller than the outer diameter of the end portion. By adopting the laser module, the water resistance is reduced, the water flow is increased, the heat dissipating capacity is improved, the forms and quantity of assembled parts are simplified, the difficulty of an assembly process is lowered, and the consistence of the assembly batch is improved.

The invention discloses a novel electromagnetic leakage circuit breaker, include a circuit breaker body, trip mechanism, Operating mechanism, Contact system and leakage signal output system, The tripping mechanism, the operating mechanism, the contact system and the leakage signal output system are arranged inside the circuit breaker body, and the leakage signal output system is used for transmitting the leakage output signal to the operating mechanism, and also comprises a positioning device and a leakage test button. The invention has the advantages of stable frame molding and simple assembly.

The invention discloses a valve element assembling structure for a double-valve element EGR valve. The valve element assembling structure comprises a central rod which is inserted into a valve assembly; a small valve element and a big valve element which are matched with a valve seat sealing port are respectively fixed on a middle lower part of the central rod; the central rod is fixedly connectedwith the small valve element and the big valve element in the manner of welding; the small valve element and the big valve element are in same structure and both have a conical valve element structure; the diameter of the top end face of the conical valve element is smaller than the diameter of a valve body sealing port; the diameter of the bottom end face of the conical valve element is greaterthan the diameter of the valve body sealing port; a driving plate with a cam structure is arranged in the valve seat above the central rod; one end of the driving plate is connected with a motor shaftof the EGR valve through a rotating shaft; the other end of the driving plate is resisted against and connected with the central rod. According to the invention, a welding assembling technology is adopted for assembling the small valve element, the big valve element and the central rod, so that the difficulty of the original double-valve element EGR valve assembling technology is reduced, the production cost of the double-valve element EGR valve is lowered and the production quality of the double-valve element EGR valve is increased.

The invention relates to the technical field of textile machinery, in particular to a jacquard machine assembly device. The jacquard machine assembly device comprises a broach, electromagnets, clamping plates, a reset spring piece, a moving iron vertical hook, suction assistance spring pieces and reset spring hooks. The broach is arranged on a jacquard machine, the electromagnets are arranged on the clamping plates, the reset spring is arranged on the electromagnet, and the vertical moving iron hook is arranged between the two clamping plates. The vertical moving iron hook is driven by the broach to slide in a T-shaped groove formed by the two clamping plates. A soft magnetic insert is arranged in the vertical moving iron hook. The reset spring hooks are arranged on the clamping plates, and the suction assistance spring pieces are arranged above the reset spring hooks. By means of the jacquard machine assembly device, a moving iron shaft, a moving iron pressure spring, moving iron and a tongue spring which are prone to abrasion are omitted, so that component failures caused by abrasion of the moving iron shaft, the moving iron pressure spring, the moving iron and the tongue spring are eliminated, the component structure is changed, the service lives of the components are prolonged, the machining and assembling difficulty of all components is reduced, production cost is reduced, the failure occurrence rate and maintenance cost are reduced, and the production efficiency of the jacquard machine is improved.

The invention provides a backlight module and a display device. The backlight module comprises a first region and a second region disposed in the first region. The first region is provided with a backplate. The back plate comprises a bottom plate and a side plate connected with the bottom plate. The bottom plate is a through hole in the second region. The side plate surrounds the second region. According to the backlight module, an annular flexible circuit board and a light guide component are arranged in the second region. A light source is disposed on the inside surface of the annular flexible circuit board. The annular flexible circuit board is fixedly connected with the side plate, so that the assembly process difficulty is reduced, the basic function of display can be achieved underthe action of the light guide component, and the fixing process of the light source can be simplified.

The invention relates to the technical field of sensors, more particularly to a water level sensor comprising a lower casing and an upper casing that are connected together. An air inlet channel is formed in one side of the lower casing. A detecting chamber is arranged in a sealed cavity formed between the lower casing and the upper casing and includes a silicone membrane; and the sealed cavity isdivided into an upper chamber and a lower chamber by the silicone membrane. A magnetic core is connected to a buckle assembly through an ejection assembly. The ejector assembly includes a bottom plate and a hollow top rod that are integrated; the magnetic core sleeves the outside of the hollow top rod; and an inductance coil is connected with a wiring terminal arranged at one side of the upper casing. The assembling process difficulty is reduced substantially; the magnetic core can move up and down stably; and the assembly efficiency and measurement accuracy of the sensor are improved substantially. Meanwhile, on the basis of the reasonable structural design of the air inlet at the bottom of the silicone membrane, forces applied on the bottom of the silicone membrane become uniform and fixed-direction uniform-speed movement is realized. The service life of the sensor is prolonged; and the accuracy of the water level detection is improved.

The invention provides a thyristor element, a thyristor element assembly structure and a soft starter. The thyristor element comprises a gate pole assembly and a chip packaging assembly. The chip packaging assembly is provided with a blind hole which is at least partially and fixedly connected with the gate pole assembly. The axis of the blind hole is perpendicular to a chip in the chip packagingassembly, and the gate pole assembly comprises a gate pole needle which extends out from the interior of the gate pole assembly and abuts against a chip gate pole of the chip; and a lug plate extending out of the top of the gate pole assembly and used for connecting the gate pole needle and the lead. The thyristor element assembling structure comprises a first radiator, a second radiator and a thyristor element clamped between the first radiator and the second radiator. The first radiator and the second radiator are connected through an insulating fastener. And the disc spring group of the insulating fastener is sleeved outside the insulating sleeve and is positioned between the first radiator and the insulating sleeve. By using the thyristor element, welding can be avoided, the assembly difficulty can be reduced, the service life of the soft starter can be prolonged, and the cost of the soft starter can be reduced.

The invention discloses a vehicle-mounted display screen frame which is characterized in that the vehicle-mounted display screen frame comprises a glass cover plate, an FOG display screen, an optical film, a display screen back plate and a plastic rear shell which are sequentially arranged, the display screen back plate is made of magnesium alloy, and compared with the prior art, the vehicle-mounted display screen frame has the advantages that the narrow frame effect is achieved, the attractiveness is improved, and the assembly process difficulty is reduced.

A magnetic coupling transmission device comprises an outer stator disposed on an outermost side, and a group including an outer rotor, a modulating device and an inner rotor and coaxial with the outer stator. Any two adjacent ones of the outer stator, the outer rotor, the modulating device and the inner rotor have a gap therebetween. The outer rotor and the inner rotor both include permanent magnets. The outer stator includes a stator core and an armature winding and is disposed in a housing. Both sides of the housing are fixedly connected to the left end cover and the right end cover respectively. The axial centers of the left end cover and the right end cover are connected to one end of an outer rotor shaft and one end of an inner rotor shaft respectively. The stator is arranged on the outermost side and the two ends of the stator are connected with the inner and outer rotor shafts respectively so as to overcome complex structure and difficult assembly process in the prior art. The magnetic coupling transmission device is scientific and rational in overall layout, easy to install and use, small in size, light in weight, low in maintenance cost, widely used in transmission technical field such as wind power generation, electric vehicles and the like.

The invention provides a battery box, a battery pack and a vehicle. The battery box comprises a box body and a box cover; the box body defines a containing cavity with one end being open, and the openend of the containing cavity is provided with a flange surface; the box cover covers the open end of the containing cavity and comprises a cover body and an elastic sealing element which is connectedto the outer edge of the cover body; the cover body and the box body are firmly connected; and the sealing element is attached to and in sealed connection with the flange surface. By changing the structure of the box cover and preparing the periphery portion of the box cover with an elastomer material, the box cover has the function of an elastic sealing structure and can be in sealed connectionwith the box body directly through the sealing element of the box cover, so that the variety and number of parts are reduced; the assembly process of the battery box is simplified; the weight of the battery box is reduced at the same time; the lightweight requirement of cars is met, and the energy density of the battery pack can be increased advantageously so that the increasing requirement for the power performance and the endurance mileage of electric cars can be met.