CN109038934B - Electrodynamic balance car's in-wheel motor and electrodynamic balance car - Google Patents

Abstract

The invention discloses an electric balance car and an in-wheel motor thereof, the electric balance car comprises a car body and wheels fixed on two sides of the car body, the wheels comprise the in-wheel motor, the in-wheel motor comprises a rotating shaft, a rotor and a pin, the rotating shaft comprises a fixed section, the fixed section is a region with threads on the outer surface of the rotating shaft, the outer surface of the fixed section is provided with a first pin groove, the first pin groove is a groove, the rotor comprises a central hole, the central hole is a through hole, the inner side wall of the central hole is provided with threads, the inner side wall of the central hole is provided with a second pin groove, the second pin groove is a groove, the rotating shaft and the rotor are matched and installed with the threads of the central hole of the rotor through the fixed section of the rotating shaft, the first pin groove and the second pin groove are matched and formed into a pin groove, the pin is matched and fixed with the pin groove, the in-, the wire passing hole section is used for passing through a circuit wire and is of an assembling structure.

Description

Electrodynamic balance car's in-wheel motor and electrodynamic balance car

Technical Field

This scheme relates to electrodynamic balance car, and more specifically says, relates to an electrodynamic balance car's in-wheel motor and electrodynamic balance car.

Background

The operation principle of the electric balance vehicle, also called a somatosensory vehicle and a thinking vehicle, is mainly based on a basic principle called dynamic stability, a gyroscope and an acceleration sensor in the vehicle body are utilized to detect the change of the posture of the vehicle body, and a servo control system is utilized to accurately drive a motor to carry out corresponding adjustment so as to keep the balance of the system.

Electrodynamic balance car includes the automobile body and is fixed in the wheel of automobile body both sides, and the wheel includes in-wheel motor and pivot, and in-wheel motor is fixed with the pivot cooperation.

In the process of assembling wheels of the conventional electric balance car, the matching of the rotating shaft and the hub motor is an interference fit installation method, the installation needs to use a large force to enable the rotating shaft and the hub motor to be in rigid fit, the installation speed is low, and the assembly efficiency of the hub motor is low.

Disclosure of Invention

The invention aims to solve the technical problem of providing an electric balance car and a hub motor thereof with high assembly efficiency.

The first purpose of the invention is realized by the following technical scheme:

the utility model provides an in-wheel motor of electrodynamic balance car, electrodynamic balance car includes the automobile body and is fixed in the wheel of automobile body both sides, the wheel includes in-wheel motor, in-wheel motor includes pivot, rotor and round pin, the pivot includes the canned paragraph, the canned paragraph sets up the screwed region for the surface of pivot, the surface of canned paragraph is provided with first cotter way, first cotter way is a recess, the rotor includes the centre bore, the centre bore is a through-hole, the inside wall of centre bore is provided with the screw thread, the inside wall of centre bore is provided with the second cotter way, the second cotter way is a recess, and pivot and rotor are installed through the thread fit of the canned paragraph of pivot and the centre bore of rotor, first cotter way with the cooperation of second cotter way forms the cotter way, the round pin is fixed with the cotter way cooperation.

The pivot and the rotor pass through the screw-thread fit installation of the fixed section of pivot and the centre bore of rotor, the pivot and the rotor of current electrodynamic balance car are through interference fit installation, this installation need use very big power to make both rigid cooperations, all can cause the damage to pivot and rotor, and the installation rate is slow, if utilize the screw-thread fit installation, both can avoid using the brute force, reduce the damage to pivot and rotor, but greatly increased installation rate again, pivot and rotor after the cooperation installation, insert the cotter way through the round pin and fix, can guarantee the stability after the cooperation installation. Therefore, the stability of the rotating shaft and the rotor after being installed in a matched mode is guaranteed, and the assembling efficiency of the hub motor is improved.

Optionally, the rotating shaft comprises a first connecting section, a separating section and a second connecting section, one end of the separating section is connected with the first connecting section, the other end of the separation section is connected with a second connecting section, the diameter of the separation section is larger than that of the first connecting section, the diameter of the separation section is larger than that of the second connecting section, the height of the outer surface of the separation section is higher than that of the bottom surface of the first pin groove, the rotating shaft comprises a line passing hole section, the hub motor comprises a circuit line, the line passing hole section is used for passing through the circuit line, the thread passing hole section is connected with the fixed section and comprises an outlet section, the outlet section is one end of the thread passing hole section close to the fixed section, the diameter of the outlet section is larger than that of the fixed section, the hinge pin is characterized in that an avoiding groove is formed in the rotating shaft and is a groove, the avoiding groove is used for enabling a pin to enter the pin groove, and the height of the bottom surface of the avoiding groove is lower than that of the bottom surface of the first pin groove.

The round pin of this scheme is installed after the pivot installation, because the height that highly is higher than the bottom surface of first cotter way of surface of separation section, the diameter that is close to the line hole section of crossing of canned paragraph one end is greater than the diameter of canned paragraph, can be blocked when the round pin injects the cotter way, set up in the pivot and dodge the groove, the bottom surface height that dodges the groove is less than the bottom surface height of first cotter way, make dodge the groove and not block first cotter way mouth, it provides an inlet port for the installation of round pin to dodge the groove, it is easier when making the erection pin.

Optionally, the outlet section is provided with an outlet hole, and the avoiding groove is arranged in the separation section.

Because the outlet section is provided with a wire outlet hole, if the outlet section of the wire passing hole section is provided with the avoiding groove, the arrangement of the avoiding groove can influence the wire outlet, the structure of the outlet section is relatively complex, and the avoiding groove is arranged at the separation section and can be easily arranged.

Optionally, the diameter of the separation section is smaller than the diameter of the fixing section.

The diameter of the separation section is smaller than that of the fixed section, the separation section enters the central hole before the fixed section in the installation process of the rotating shaft and the rotor, and the separation section is smaller than the fixed section in diameter due to the fact that the central hole is provided with the internal thread, and the rotating shaft is convenient to install.

Optionally, the width of the pin is greater than the width of the pin slot, the height of the pin slot is not greater than the height of the pin, and the pin slot are in interference fit.

Be interference fit between round pin and the cotter way, the round pin after the cooperation does not allow movable phenomenon to guarantee that the pivot is fixed firm, and interference fit is exactly to exert powerful, makes the round pin firmly fix in the cotter way, and this kind of cooperation is exactly as long as the original paper does not self damage, and the cooperation fastness just can not reduce so. Therefore, the pin and the pin groove are in interference fit, and the rotating shaft is firm.

Optionally, the avoiding groove comprises a pin notch, the pin notch is an opening at one end of the avoiding groove far away from the fixed section, and the pin notch is of a fillet structure.

The design of round pin notch is for the radius angle structure, and in the round pin installation, the head and the first contact of round pin notch of round pin, to interference fit, the damage of round pin notch can be avoided to the guide design structure of just installing, and to the production angle, the setting of radius angle structure also makes things convenient for the demolding process.

Optionally, the head of the pin is of a chamfered structure, and the head of the pin is one end which enters the pin slot first.

The head of round pin designs chamfer structure, and in the round pin installation, the head goes into the cotter way earlier, because round pin and cotter way are interference fit, if the head of round pin does not do the chamfer and reduces the size and handle during the installation, the initial installation degree of difficulty is big then, installs by force moreover and probably damages the component, and the chamfer of head plays the guide effect to the installation of round pin. Therefore, the head of the pin provided by the scheme is designed into a chamfering structure, and the pin is convenient to mount.

Optionally, the tail of the pin is a flat surface, and the tail of the pin is one end that enters the pin slot after entering.

The afterbody of round pin is the plane, and in the round pin installation, because be interference fit, consequently the afterbody can receive great striking force, and this just needs afterbody atress face to be the plane, and lifting surface is big, and the plane does not need special treatment moreover, and what the round pin produced the back natural formation just can satisfy the use, and the plane that naturally forms also has certain roughness, can hinder application of force instrument to produce and slide, more conveniently applies the installation power to the round pin.

Optionally, the wheel includes an outer wheel bearing, the inserted outer wheel bearing section of the rotating shaft is connected and fixed with the outer wheel bearing, the tail plane of the pin is not protruded from the outer end face of the separation section, the tail of the pin is one end of the pin which enters the pin slot at the rear, and the outer end face of the separation section is one face of the separation section close to the outer wheel bearing.

The pin installation back afterbody plane does not bulge in the outer terminal surface of separation segment, and the wheel hub motor installation back, the outer terminal surface and the outer wheel bearing contact of separation segment, if the pin overlength leads to the afterbody plane after the installation to bulge in the separation segment outer terminal surface, and the pin replaces the outer terminal surface of separation segment and outer wheel bearing contact, can influence the normal rotation of pivot then, also can influence the installation of wheel hub motor. Therefore, the scheme provides that the plane of the tail part is not protruded out of the outer end face of the separation section after the pin is installed, and the rotation of the rotating shaft is not influenced.

Optionally, the pin is a cuboid, and the pin groove is also of a cuboid structure.

The round pin is the cuboid, and what the round pin was interference fit with the keyway, and the round pin is knocked into the keyway through the brute force in, and the round pin shape rule of cuboid, the structure is even, and compares other shapes, and the cuboid does not need too much processing to get, low cost, can satisfy the fixed function of this scheme round pin moreover.

Optionally, the pin is a cylinder, and the pin slot is also a cylinder.

The pin is a cylinder, all directions of the pin of the installed cylinder are subjected to the same force, the resultant force of the stress of the cylindrical surface is zero, and therefore the pin is long in service life and not easy to damage. Therefore, the pin provided by the scheme is designed to be a cylinder, and the mechanical property is good.

Optionally, the number of the pins is one, a pin slot is formed in the side wall of the central hole, and the pins and the pin slot are matched and fixed.

The number of the pins for fixing one rotating shaft and one rotor is one, the rotating shaft and the rotor reach firmer formation after being matched through threads, the pins are used for ensuring that the rotating shaft and the rotor cannot be loosened, namely, only the pins are needed to prevent the rotating shaft from rotating towards the loosening direction relative to the rotor, and then one pin can meet the fixing requirement. Therefore, the number of the pins for fixing one rotating shaft and one rotor is one, the cost is low, and the fixing function is met.

Optionally, the number of the pins is multiple, the side wall of the central hole is provided with corresponding pin grooves, and the pins and the pin grooves are matched and fixed.

The number of the pins is multiple, after the rotating shaft and the rotor are installed, the installation is fixed through the pins, if only one pin is used for fixing, the fixing requirement can be met initially, but under the condition that the wheel bears the load for a long time and is used, deformation of materials is inevitable, if the materials near the pins or the materials of the pins deform, the relative fixing of the rotating shaft and the rotor can be influenced, and if the rotating shaft and the rotor are fixed together through the pins, the pins correspond to each other, the relative fixing between the rotating shaft and the rotor is strengthened, and the fixing effect is better.

Optionally, the included angles between the pins after installation are equal.

The contained angle equals between the round pin after the installation, at first from the structure angle, the round pin distributes evenly, and the structure is pleasing to the eye, then from fixed effect analysis, if the contained angle between the round pin is not equal, so every atress of round pin just is unequal, can cause the difference for a long time, influences holistic fixed effect. Consequently, this scheme provides the contained angle between the round pin after the installation and equals, and the structure is pleasing to the eye and fixed effectual.

Optionally, the pin includes an insertion section and an initial section, the insertion section is connected with the initial section, the diameter of the insertion section is larger than that of the initial section, the insertion section of the pin is provided with threads, the first pin groove and the second pin groove are respectively provided with threads, and the pin groove are matched and fixed through the threads.

The pin is installed and fixed by threads, the pin and the pin groove for fixing the rotating shaft and the rotor are realized by interference fit, the installation difficulty is high, the surface of a part subjected to knocking force can generate knocking marks during installation, and the pin is an installation method for damaged elements. Consequently, the round pin that this scheme provided adopts the screw thread installation fixed, easy to assemble.

Optionally, the starting section includes an outer end surface and an inner end surface, the inner end surface is one end connected to the inserting section, the outer end surface and the inner end surface are arranged oppositely, a groove is arranged on the outer end surface, and the groove is matched with a disassembling tool to disassemble and assemble the pin.

The initial segment design of round pin and extracting tool complex recess because the round pin is rotatory through the screw thread and realizes the installation, the round pin just should possess with rotatory structure of implementing the effect of power, it is narrow and small to consider the mounted position of round pin, only through people's hand installation difficulty, just so should with the help of the instrument, consider that current general instrument generally all acts on in the groove structure, realize rotatory dismouting function, for example screw and screwdriver. Therefore, the large end of the pin is provided with the groove matched with the disassembling tool, and the pin and the disassembling tool are convenient to disassemble and assemble.

Optionally, the outer end surface of the starting section does not protrude from the outer end surface of the central hole, and the outer end surface of the central hole is a surface close to the separating section.

After the round pin installation, the outer terminal surface of initial segment does not bulge in the outer terminal surface of centre bore, the round pin after also installing is structurally not convex, at first look structural integrity strong like this, it is pleasing to the eye, then initial segment is located the pivot equally between the rotor, can play the cooperation of fixed pivot and rotor, compare the condition of the outer terminal surface bulge of initial segment in the outer terminal surface of centre bore like this, the fixed effect of this structure is better, and because initial segment diameter is great, fixed function to the round pin also can play the effect of strengthening. Therefore, the outer end face of the initial section does not protrude out of the outer end face of the center hole after the pin is installed, the structure is attractive, and the fixing effect is better.

Optionally, the groove is rectangular.

The groove is designed to be rectangular strip-shaped, the existing universal screw disassembling tool comprises a flat-head screwdriver, and the screwdriver can realize the disassembling and assembling of the pin. Therefore, the design of the groove is rectangular strip, and the flat screwdriver is convenient to disassemble and assemble.

Optionally, the groove is in a cross shape.

The groove is designed into a cross-flower shape, the existing universal screw dismounting tool comprises a cross-flower-shaped screwdriver and a flat-head screwdriver, the cross-flower-shaped screwdriver is common in life and complete in specification, compared with the flat-head screwdriver, the head of the cross-flower-shaped screwdriver is provided with four convex edges for applying force, the head of the flat-head screwdriver is only provided with one edge, when the two kinds of screwdrivers act on respective grooves for normal use, the flat-head screwdriver can damage the grooves more easily, and once one corner of the groove matched with the flat-head screwdriver is damaged, the groove can not be normally used any more. Therefore, this scheme provides the recess design and is the cross flower shape, facilitates the use cross flower shape screwdriver dismouting round pin.

Optionally, the groove is a regular hexagon.

The recess designs for regular hexagon, refers to interior countersunk head hexagon screw promptly, and hexagon spanner among the current screw assembly and disassembly tools can mean that application range is wide, with low costs, complete specification, compares with traditional screwdriver, and hexagon spanner can change the direction of use in a flexible way and fasten countersunk head hexagon screw, even countersunk head hexagon screw uses can also realize the dismouting in very narrow and small position, and hexagon spanner will apply force equallys divide into six angles, greatly protects countersunk head hexagon screw. Consequently, this scheme provides the recess design and is regular hexagon, facilitates the use hexagonal spanner dismouting round pin.

Optionally, the groove comprises a notch, the notch is arranged as a chamfer, and the chamfer is inclined to the inside of the groove.

Design the chamfer on the notch of recess, during general screwdriver dismouting screw, the model all is corresponding, the cooperation of same model back, screwdriver head and screw recess all are closely laminated, make things convenient for the application of force, on the same hand, do not do structural chamfer processing if the recess notch of this scheme, so need many time spent when the assembly and disassembly tools of specification inserts, and the chamfer of tendency inslot is seted up to the notch can play guide extracting tool male effect, shorten the installation time of wheel, also be one kind and save cost's embodiment. Therefore, the chamfer is designed on the notch of the groove, so that the dismounting tool can be conveniently inserted into the groove.

Optionally, the in-wheel motor includes the circuit line, the pivot is including crossing the line hole section, cross the line hole section with the canned paragraph is connected, cross the line hole section and be used for passing through the circuit line, cross the line hole section and be for can assembling the structure.

The circuit line of the wheel hub motor of the existing electric balance car passes through the line hole section, the line hole section is of an integral structure, and the line installation is very troublesome due to the line through hole, so that the installation is very time-consuming. The line passing hole section is of an assembling structure, so that the line is placed well firstly, and then the line passing hole section is assembled, thereby being convenient and time-saving. Therefore, the scheme provides that the wire passing hole section of the rotating shaft is designed to be assembled, and the line installation of the hub motor is facilitated.

Optionally, the wire passing hole section comprises a main body and an auxiliary body, a sliding groove is formed in the main body, a sliding rail is arranged on the auxiliary body, and the sliding rail and the sliding groove are in sliding fit to achieve assembly of the wire passing hole section.

The line hole section is assembled in a sliding mode, the sliding assembly can be achieved without an additional fixing structure, the fixing effect is good, the sliding rail only needs to slide along the sliding groove during installation, and the line hole section is convenient to assemble.

Optionally, the inside of main part is provided with first recess, first recess is a recess, the main part is including crossing the line hole, it is a through-hole and first recess intercommunication to cross the line hole, cross the one end that the line hole set up in the main part and be close to the fixed section, the inside of auxiliary body is provided with the second recess, the second recess is a recess, first recess, second recess and cross the line hole cooperation and form the through wires hole and be used for placing the circuit, the main part is including the fixed plane, the fixed plane is a sunken step face in the main part, and the face of main part and auxiliary body cooperation contact is called the interface, the interface with the fixed plane is parallel.

Interface and fixed plane are parallel, after the wheel is fixed, the direction of the main force that receives in the pivot is the same with fixed plane's normal direction, if interface and fixed plane are parallel, then sub-body and main part also can receive with interface normal direction equidirectional power, at this moment, the power that slide rail and spout received is less, can not cause the damage to slide rail and spout, if interface and fixed plane nonparallel, then the very big part of power that main part and sub-body received can be born by slide rail and spout, make the atress performance of main part and sub-body reduce, produce deformation easily, from the use that influences electrodynamic balance car. Therefore, the interface of the main body and the auxiliary body provided by the scheme is parallel to the fixed plane on the main body, and the stress performance of the assembled rotating shaft is better.

Optionally, the depth of the first groove of the main body is equal to the depth of the second groove of the secondary body.

The degree of depth of the first recess of main part equals the degree of depth of the second recess of the auxiliary body, and main part and auxiliary body all include half the through wires hole, and relative circuit installation angle is at this moment, and the opening of through wires hole is 180, is the biggest opening this moment, and half the through wires hole is used for putting before the circuit installation in addition, has certain fixed action to the circuit, can make things convenient for the installation of circuit.

Optionally, the depth of the first groove of the main body is greater than the depth of the second groove of the secondary body.

The degree of depth of first recess is greater than the degree of depth of second recess, so the main part includes a majority of through wires hole that this is so, in the circuit installation, will pass the through wires hole with the circuit earlier, then half fix the circuit in the through wires hole of main part, install the vice body at last, it is fixed with the circuit, at half fixed in-process, because the circuit is softer, it is not very convenient to fix, and the main part including a majority of through wires hole can constitute more and half encirclement to the circuit, make the circuit "go out difficultly easily in, this installation of vice body after also making things convenient for. Therefore, the scheme provides that the interface of the main body and the auxiliary body deviates to the auxiliary body in position, so that the circuit is convenient to fix during installation.

Optionally, the wire passing hole section comprises a fixing piece, a first fixing position is arranged at the tail end of the main body, one end of the tail end of the main body, away from the rotor, a second fixing position is arranged at the tail end of the auxiliary body, one end of the tail end of the auxiliary body, away from the rotor, a complete fixing position is formed after the first fixing position and the second fixing position are matched, and the fixing piece is matched with the complete fixing position in an installation mode.

The main part and the auxiliary body after the equipment are fixed through the fixing piece, if the main part and the auxiliary body after the equipment are fixed without the fixing piece, the hidden danger that the main part and the auxiliary body are separated can exist, and the main part and the auxiliary body after the installation can be ensured not to be separated through the fixing piece, so that the main part and the auxiliary body after the equipment are firmer.

Optionally, the outer surface of the first fixed position is provided with threads, the outer surface of the second fixed position is provided with threads, the first fixed position and the second fixed position are matched to form a bolt, the fixing part is a nut, the inner side wall of the nut is provided with threads, and the bolt is matched with the nut in an installation mode.

The nut is selected for use to the mounting, there is a packing power to the bolt that first fixed position and second fixed position are constituteed after the nut installation, this packing power plays 360 limiting displacement to main part and accessory body, and the screw thread of first fixed position and the fixed position of second and the screw thread effect of nut have a limiting displacement that is on a parallel with pivot central line direction to main part and accessory body, main part and accessory body after the fixed mounting that the nut can be fine like this, simultaneously, the nut installation is simple, convenient. Consequently, the mounting that this scheme provided chooses for use the nut, fixed effectual, simple to operate.

Optionally, the wheel includes an inner wheel bearing, the nut is an annular cylinder, the outer diameter of the nut is not greater than the outer diameter of the wire passing hole section, and the wire passing hole section is in inserting fit with the inner wheel bearing.

The nut external diameter is not more than cross line hole section external diameter, if the nut external diameter is greater than cross the line hole section, can lead to crossing interior wheel bearing difficulty of line hole section interlude, and the nut external diameter is not more than cross line hole section external diameter, can make things convenient for pivot and interior wheel bearing to alternate the cooperation.

Optionally, the nut includes interior circle and excircle, the surface of excircle is provided with a plane, the distance of axis to plane of nut is greater than the interior circle radius of nut and is less than nut excircle radius.

Design the plane on the excircle of nut, the nut is used for main part and the auxiliary body after the fixed mounting, so the installation back needs nut self firm, so need use certain torsional force to the nut during installation, if the application of force in the face of cylinder, so the nut can not be screwed up, because inconvenient hard, after designing the plane on the outer face of cylinder at the nut, finger or application of force instrument can act on the plane, conveniently hard, and the nut also can be fixed tighter like this. Therefore, this scheme provides design plane on the excircle of nut, application of force when making things convenient for the nut installation.

Optionally, the surface of the outer circle of the nut is a rough surface, and the surface of the outer circle of the nut is a force application surface when the nut is installed.

The outer circle surface of the nut is designed to be a rough surface, and because the outer circle surface is a force application surface when the nut is installed, the friction force can be increased due to the rough surface, the force application effect is good, and the nut is convenient to install.

Optionally, the nut includes an outer end surface, the outer end surface of the nut is a surface facing the end of the rotating shaft after the nut is matched with the bolt, the wire passing hole section includes an outer end surface, the outer end surface of the wire passing hole section is the end of the rotating shaft, and the outer end surface of the nut is overlapped with the outer end surface of the wire passing hole section.

The outer end face of the installed nut coincides with the outer end face of the thread passing hole section, so that the whole structure of the installed nut has a reinforcing effect on the main body and the auxiliary body, the fixing effect on the main body and the auxiliary body after installation is better, and the structure is neat and attractive in appearance. Consequently, this scheme provides the outer terminal surface of nut after the installation and the outer terminal surface coincidence of cross the line hole section, and is pleasing to the eye and fixed effectual.

Optionally, the internal surface of the first fixed position of main part is provided with the screw thread, the internal surface of the second fixed position of auxiliary body is provided with the screw thread, the mounting is the screw, the internal thread constitutes the internal thread hole after main part and the installation of auxiliary body, internal thread hole and screw installation cooperation.

The fixing piece adopts screws, the screws can limit the main body and the auxiliary body after installation to move relatively, the main body and the auxiliary body after installation are fixed, and the screws are simple and convenient to install.

Optionally, the screw includes a head and an insertion section, the complete fixing position includes an insertion groove and a matching groove, the diameter of the matching groove is larger than that of the insertion groove, the insertion section of the screw is inserted into the insertion groove, the head of the screw is matched with the matching groove, the head end face of the screw is overlapped with the outer end face of the wire passing hole section, the head end face of the screw is an end face far away from the insertion section, and the outer end face of the wire passing hole section is the tail end of the rotating shaft.

The screw head end face after installation coincides with the outer end face of the wire passing hole section, and after the screw is installed, the head is hidden in the wire passing hole section, namely the head end face coincides with the outer end face of the wire passing hole section, so that the appearance is high in integrity and beautiful, and the screw completely enters the main body and the auxiliary body which can be well fixedly installed in the wire passing hole section. Therefore, the scheme provides that the end face of the screw head after installation is superposed with the outer end face of the wire passing hole section, and the screw head is attractive and good in fixing effect.

Optionally, the rotor includes an insulating spacer, the insulating spacer plays an insulating role, the insulating spacer includes a vertical insulating spacer, the vertical insulating spacer is perpendicular to the axial direction of the rotating shaft, and the vertical insulating spacer is of an integrally formed structure.

Vertical insulating pad design on the rotor is a whole, and vertical insulating pad on the rotor of a current electrodynamic balance car wheel hub motor all is relatively independent, need alternate in the rotor in turn during the installation, need every vertical insulating pad to align after the installation moreover, and installation effectiveness is low like this, if design vertical insulating pad as a whole, in so only needing to insert the rotor during the installation, can align naturally, improves the efficiency of installation. Therefore, this scheme provides and designs vertical insulating gasket on the rotor as a whole, makes things convenient for vertical insulating gasket to install.

Optionally, the insulating spacer includes a vertical insulating spacer and a horizontal insulating spacer, the horizontal insulating spacer includes an inner horizontal insulating spacer and an outer horizontal insulating spacer, one side of the vertical insulating spacer is matched with the outer horizontal insulating spacer, the other side of the vertical insulating spacer is matched with the outer horizontal insulating spacer, and the vertical insulating spacer and the outer horizontal insulating spacer are integrated.

Vertical insulating pad and horizontal insulating pad design are a whole, and holistic structure seals the effect better, and the coil winding is more convenient, better isolated coil and rotor, and vertical insulating pad is installed with the horizontal insulating pad in the outside together simultaneously, has reduced the process of one step of separately installing, promotes the installation effectiveness. Consequently, this scheme provides vertical insulating gasket and outside horizontal insulating gasket design and is a whole, and insulating function is better and the installation effectiveness is high.

Optionally, the rotor includes a rotor core, the rotor core is matched with the rotating shaft, the rotor core includes a coil slot and gears, the coil slot is an interval between each gear, the area of the outer surface of the vertical insulating spacer is equal to the area of the inner surface of the coil slot, the outer surface of the vertical insulating spacer is a surface in contact with the coil slot, and the inner surface of the coil slot is a surface in contact with the vertical insulating spacer.

The area of the outer surface of the vertical insulating gasket is equal to the area of the inner surface of the coil slot, so that when the vertical insulating gasket is installed, the interaction force between the outer surface of the vertical insulating gasket and the surface of the coil slot is just enough, slippage can not occur after hands are not released, and the vertical insulating gasket cannot be too tight and difficult to insert. Therefore, the area of the outer surface of the vertical insulating gasket provided by the scheme is the same as the area of the inner surface of the coil slot of the rotor core, and the vertical insulating gasket is convenient to fix during initial installation.

Optionally, the rotor core includes an electronic component and teeth, the electronic component is fixed on the teeth, and the outer profile diameter of the horizontal insulating spacer is equal to the outer profile diameter of the coil slot.

The outer contour diameter of the horizontal insulating spacer is equal to the outer contour diameter of the coil slot, so that the teeth have redundant space, the electronic element is convenient to fix, and compared with the hub motor of the conventional electric balance car, the electric balance car can save materials and can not contact the teeth during winding of the coil. Therefore, the outer contour diameter of the horizontal insulating gasket provided by the scheme is designed to be equal to that of the coil slot, so that the material is saved, and enough space is provided for mounting the electronic component on the rotor.

Optionally, the horizontal insulating gasket is seamlessly combined with the vertical insulating gasket.

Horizontal insulating pad and vertical insulating pad seamless combination have the gap if between horizontal insulating pad and the vertical insulating pad, so the coil just can have the condition with the rotor core contact, can make wheel hub motor function failure like this, only makes horizontal insulating pad and vertical insulating pad seamless combination, just can guarantee isolated coil and rotor core, makes wheel hub motor normal operating. Therefore, the scheme provides seamless combination of the horizontal insulating gasket and the vertical insulating gasket, and prevents the coil from contacting the rotor core.

Optionally, the integrated horizontal insulating gasket and the vertical insulating gasket include a joint, the joint is a contact portion between the vertical insulating sheet and the outer horizontal insulating sheet, and a corner of the joint is a rounded corner.

Level and vertical integrative insulating gasket joint outside corner design are for the radius angle structure, if the joint does not do the processing, structural straight turning, when the coil winding, straight turning has one to prop up the coil, lead to the coil to produce the space in straight turning, make the winding efficiency of coil low, both extravagant coil leads to the coil to function to be poor again, if the joint designs for the radius angle structure, so the coil can smooth transition pass through, can avoid a series of problems that appear more than. Consequently, this scheme provides level and vertical integrative insulating gasket joint department outside turning design for the fillet structure, and coil winding effect is better.

Optionally, the vertical insulating spacer includes a first end surface and a second end surface, the horizontal insulating spacer includes an inner horizontal insulating spacer and an outer horizontal insulating spacer, the first end surface coincides with the outer end surface of the outer horizontal insulating spacer, the outer end surface of the outer horizontal insulating spacer is one end close to the partition section, the second end surface coincides with the outer end surface of the inner horizontal insulating spacer, and the outer end surface of the inner horizontal insulating spacer is one surface not in contact with the vertical insulating spacer.

The first end face and the second end face of the installed vertical insulating gasket are respectively superposed with the outer end faces of the horizontal insulating gaskets on the two sides, namely the width of the vertical insulating gasket is equal to the width of the rotor core plus the thickness of the horizontal insulating gaskets on the two sides, if the width of the vertical insulating gasket is smaller than the width of the rotor core plus the thickness of the horizontal insulating gaskets on the two sides, the positioning effect is poor when the horizontal insulating gasket is installed, and the horizontal insulating gasket and the vertical insulating gasket are not completely embedded structurally, so that the installation looks untidy and attractive; if the width of the vertical insulating spacer is greater than the width of the rotor core plus the thickness of the horizontal insulating spacers on both sides, material waste is caused. Therefore, the scheme provides that the two end faces of the installed vertical insulating gasket are respectively superposed with the outer end faces of the horizontal insulating gaskets on the two sides, so that the horizontal insulating gaskets are convenient to fix and neat and attractive in structure.

Optionally, the inside horizontal insulating pad includes protruding structure and through-hole, the through-hole sets up the center at the inside horizontal insulating pad, protruding structure sets up the marginal zone at the through-hole, protruding structure protrusion in the surface of inside horizontal insulating pad, the rotor core includes sunk structure, the surface of sunk structure undercut in the rotor core, protruding structure and sunk structure mutually support the installation location that realizes horizontal insulating pad.

The locating structure that designs mutually supporting on inboard horizontal insulating spacer and rotor core because when horizontal insulating spacer installation, need fix it as a suitable position, make things convenient for subsequent other part installations, and the cost of rotor core material is higher than the material cost of horizontal insulating spacer, so design protruding structure on inboard horizontal insulating spacer, design groove structure on the rotor core to save the cost. Therefore, this scheme provides the location structure of design mutually supporting on horizontal insulating gasket and rotor core, makes things convenient for horizontal insulating gasket's installation location.

Optionally, the height of the protrusion of the protruding structure is equal to the depth of the recess of the recessed structure.

The height of the protrusion structure is equal to the depth of the recess structure, so that the protrusion structure is matched with the recess structure without a gap, and the horizontal insulating gasket has no moving space, so that the horizontal insulating gasket is positioned stably.

Optionally, the protruding structure is a cuboid, the recessed structure is a cuboid, and the protruding cuboid and the recessed cuboid are installed and matched to achieve installation and positioning of the horizontal insulating gasket.

Protruding structure and sunk structure all design for the cuboid, and the cuboid shape is more regular, and after bellied cuboid and sunken cuboid cooperation, it is effectual to the rotation of horizontal insulating gasket and horizontal migration's restraint, also makes horizontal insulating gasket's fixed effect better.

Optionally, the number of the convex cuboid and the number of the concave cuboid are both one.

The convex cuboid and the concave cuboid quantity are designed singly, the fixing effect is good after the convex and concave structures of the cuboid are matched, the horizontal insulating gasket cannot be rotated or horizontally slid in use, so that the convex cuboid and the concave cuboid quantity are designed into one, the fixing effect of the horizontal insulating gasket can be met through mutual installation and matching, and the cost is low.

Another object of the present invention is to provide an electric balance car, which includes a car body and wheels fixed to two sides of the car body, wherein the wheels include an in-wheel motor, the in-wheel motor includes a rotating shaft, a rotor and a pin, the rotating shaft includes a fixing section, the fixing section is a region where a thread is provided on an outer surface of the rotating shaft, the outer surface of the fixing section is provided with a first pin groove, the first pin groove is a groove, the rotor includes a central hole, the central hole is a through hole, an inner side wall of the central hole is provided with a thread, an inner side wall of the central hole is provided with a second pin groove, the second pin groove is a groove, the rotating shaft and the rotor are installed in a threaded fit manner through the fixing section of the rotating shaft and the central hole of the rotor, the first pin groove and the second pin groove are matched to form a pin groove, and the pin.

The pivot and the rotor pass through the screw-thread fit installation of the fixed section of pivot and the centre bore of rotor, the pivot and the rotor of current electrodynamic balance car are through interference fit installation, this installation need use very big power to make both rigid cooperations, all can cause the damage to pivot and rotor, and the installation rate is slow, if utilize the screw-thread fit installation, both can avoid using the brute force, reduce the damage to pivot and rotor, but greatly increased installation rate again, pivot and rotor after the cooperation installation, insert the cotter way through the round pin and fix, can guarantee the stability after the cooperation installation. Therefore, the stability of the rotating shaft and the rotor after being installed in a matched mode is guaranteed, and the assembling efficiency of the hub motor is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of a balance car according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of the in-wheel motor according to the embodiment of the invention.

Fig. 3 is a schematic structural diagram of a rotating shaft according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a rotor according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a plurality of pins according to an embodiment of the present invention.

Fig. 6 is a partially enlarged view of a in fig. 5 according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of a sliding fit installation according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of an insulating spacer according to an embodiment of the invention.

Fig. 9 is a schematic structural view of a rotor core according to an embodiment of the present invention.

Fig. 10 is a schematic structural view of nut fixing according to still another embodiment of the present invention.

Fig. 11 is a schematic structural view of a screw fixing according to another embodiment of the present invention.

Fig. 12 is a schematic structural view of a wheel assembly according to an embodiment of the present invention.

Wherein: 1. a vehicle body; 2. a wheel; 3. a pin; 4. a rotor; 5. a rotating shaft; 6. a fixed section; 7. a central bore; 8. a first pin slot; 9. a second pin slot; 10. a separation section; 11. a first connection section; 12. a second connection section; 13. a wire passing hole section; 14. an outlet section; 15. an avoidance groove; 16. inserting an outer wheel bearing section; 17. a pin slot; 18. a circuit line; 19. a main body; 20. a sub-body; 21. fixing a plane; 22. a vertical insulating spacer; 23. an outer horizontal insulating spacer; 24. an inner side horizontal insulating spacer; 25. a rotor core; 26. a coil slot; 27. a raised structure; 28. a recessed structure; 29. an electronic component; 30. teeth; 31. a nut; 32. a bolt; 33. a screw; 34. an outer wheel bearing; 35. an inner wheel bearing.

Detailed Description

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments.

For example, the terms "central," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting; unless expressly limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that a connection may be fixed or removable or integral; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless expressly stated otherwise; "plurality" means two or more. The terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The invention is further described with reference to the drawings and the preferred embodiments.

In the process of assembling wheels of the conventional electric balance car, the matching of the rotating shaft and the hub motor is an interference fit installation method, the installation needs to use a large force to enable the rotating shaft and the hub motor to be in rigid fit, the installation speed is low, and the assembly efficiency of the hub motor is low.

An in-wheel motor of an electric balance car according to an embodiment of the present invention will be described with reference to fig. 1 to 12.

Referring to fig. 1, 2, 3 and 4, the present embodiment discloses an in-wheel motor of an electric balance car, the electric balance car includes a car body 1 and a wheel 2 fixed on both sides of the car body 1, the wheel 2 includes the in-wheel motor, the in-wheel motor includes a rotating shaft 5, a rotor 4 and a pin 3, the rotating shaft 5 includes a fixed section 6, the fixed section 6 is an area where the outer surface of the rotating shaft 5 is provided with a thread, the outer surface of the fixed section 6 is provided with a first pin groove 8, the first pin groove 8 is a groove, the rotor 4 includes a center hole 7, the center hole 7 is a through hole, the inner side wall of the center hole 7 is provided with a thread, the inner side wall of the center hole 7 is provided with a second pin groove 9, the second pin groove 9 is a groove, the rotating shaft 5 and the rotor 4 are installed by the thread fit of the fixed section 6 of the rotating shaft 5 and the center hole 7, first cotter way 8 with second cotter way 9 cooperation forms cotter way 17, the round pin is fixed with cotter way 17 cooperation, in-wheel motor includes circuit line 18, the pivot is including crossing line hole section 13, cross line hole section 13 with canned paragraph 6 is connected, cross line hole section 13 and be used for through circuit line 18, cross line hole section and be assembled structure.

The pivot 5 and the rotor 4 are installed through the thread fit of the fixed section 6 of pivot 5 and the centre bore 7 of rotor 4, the pivot 5 and the rotor 4 of current electrodynamic balance car are installed through interference fit, this installation need use very big power to make both rigid cooperations, all can cause the damage to pivot 5 and rotor 4, and the installation rate is slow, if utilize the thread fit installation, both can avoid using the brute force, reduce the damage to pivot 5 and rotor 4, but also greatly increased the installation rate, pivot 5 and rotor 4 after the cooperation installation, insert cotter way 17 through round pin 3 and fix, can guarantee the stability after the cooperation installation. Therefore, the scheme ensures the stability of the rotating shaft 5 and the rotor 4 after being installed in a matching way and improves the assembling efficiency of the hub motor. The circuit line of the wheel hub motor of the existing electric balance car passes through the threading hole section, the threading hole section is of an integral structure, and the circuit installation is very troublesome due to the threading hole, so that the installation is very time-consuming. The threading hole section is of an assembling structure, so that the line is placed well firstly, and then the threading hole section is assembled, thereby being convenient and time-saving. Therefore, this scheme provides the through wires hole section design of pivot for can assembling, makes things convenient for in-wheel motor's circuit installation.

As another embodiment of the present invention, referring to fig. 3, the difference from the above embodiment is that the rotating shaft 5 includes a first connecting section 11, a separating section 10 and a second connecting section 12, one end of the separating section 10 is connected to the first connecting section 11, the other end of the separating section 10 is connected to the second connecting section 12, the diameter of the separating section 10 is larger than that of the first connecting section 11, the diameter of the separating section 10 is larger than that of the second connecting section 12, the diameter of the separating section 10 is smaller than that of the fixing section 6, the height of the outer surface of the separating section 10 is higher than that of the bottom surface of the first groove, the rotating shaft 5 includes a wire passing hole section 13, the hub motor includes a circuit line 18, the wire passing hole section 13 is used for passing through the circuit line 18, the wire passing hole section 13 is connected to the fixing section 6, the wire passing hole section 13 includes an outlet section 14, the outlet section 14 is one end of the wire passing hole section 13 close to the fixing section 6, the diameter of export section 14 is greater than the diameter of fixed section 6, export section 14 is provided with a wire hole, be equipped with on the pivot 5 and dodge groove 15, it is a recess to dodge groove 15, dodge the groove 15 and set up at the partition segment 10, dodge groove 15 and be used for selling 3 and get into cotter 17, the bottom surface height of dodging groove 15 is less than the bottom surface height of first cotter 8. Dodge groove 15 including the round pin notch, the round pin notch is for dodging the opening of groove 15 and keeping away from fixed segment 6 one end, the round pin notch is the fillet structure.

The round pin of this scheme is installed after pivot 5 is installed, because the height that highly is higher than the bottom surface of first cotter way 8 of surface of segmentation 10, the diameter of crossing line hole section 13 that is close to fixed section 6 one end is greater than the diameter of fixed section 6, can be blocked when the round pin injects the cotter way, set up in pivot 5 and dodge groove 15, the bottom surface of dodging groove 15 highly is less than the bottom surface height of first cotter way 8, make and dodge groove 15 and not block first cotter way 8 mouth, dodge groove 15 and provide an inlet port for the installation of round pin, it is easier when making the erection pin.

In addition, since the outlet section 14 is provided with one outlet hole, if the avoiding groove 15 is provided on the outlet section 14 of the wire passing hole section 13, the arrangement of the avoiding groove 15 will affect the outlet, the structure of the outlet section 14 is relatively complicated, and the avoiding groove 15 can be easily provided on the separating section 10.

In addition, the pin notch is designed into a fillet structure, the head of the pin is firstly contacted with the pin notch in the pin installation process, the guide design structure which is initially installed can avoid the damage of the pin notch in the interference fit, and the fillet structure is arranged to facilitate the demolding process in the production angle.

In addition, the diameter of the separating section 10 is smaller than that of the fixing section 6, the separating section 10 enters the central hole 7 before the fixing section 6 in the installation process of the rotating shaft 5 and the rotor 4, and the diameter of the separating section 10 is smaller than that of the fixing section 6 due to the fact that the central hole 7 is provided with internal threads, and the rotating shaft 5 is convenient to install.

Optionally, the width of the pin is greater than the width of the pin slot, the height of the pin slot is not greater than the height of the pin, and the pin slot are in interference fit. The head of the pin is of a chamfer structure, and the head of the pin is one end which enters the pin groove first. The tail of the pin is a plane, and the tail of the pin is one end which enters the pin groove backwards. The round pin is the cuboid, the keyway is the cuboid structure also. The wheel 2 comprises an outer wheel bearing 34, the section 16 of the rotating shaft 5 inserted into the outer wheel bearing 34 is fixedly connected with the outer wheel bearing 34, the plane of the tail part of the pin is not protruded out of the outer end face of the separation section 10, the tail part of the pin is one end which enters the pin groove backwards, and the outer end face of the separation section 10 is one face of the separation section 10 close to the outer wheel bearing 34.

In this scheme, be interference fit between round pin and the cotter way, round pin after the cooperation does not allow there is the activity phenomenon to guarantee 5 fixed jail of pivot, and interference fit is exactly to exert the brute force, makes the round pin firmly fix in the cotter way, and this kind of cooperation is exactly as long as the original paper does not self damage, and the cooperation fastness just can not reduce so. Therefore, the pin and the pin groove are in interference fit, and the rotating shaft 5 is firm.

In addition, the pin notch is designed into a fillet structure, the head of the pin is firstly contacted with the pin notch in the pin installation process, the guide design structure which is initially installed can avoid the damage of the pin notch in the interference fit, and the fillet structure is arranged to facilitate the demolding process in the production angle.

In addition, the tail of the pin is a plane, and in the installation process of the pin, due to interference fit, the tail can be subjected to large knocking force, so that the stress surface of the tail is required to be the plane, the stress area is large, the plane does not need special treatment, the pin can be used after being produced naturally, the naturally formed plane also has certain roughness, the force application tool can be prevented from sliding, and the installation force can be applied to the pin more conveniently. The tail plane is not protruded out of the outer end face of the separation section 10 after the pin is installed, after the hub motor is installed, the outer end face of the separation section 10 is contacted with the outer wheel bearing 34, if the pin is too long, the installed tail plane is protruded out of the outer end face of the separation section 10, the pin replaces the outer end face of the separation section 10 to be contacted with the outer wheel bearing 34, normal rotation of the rotating shaft 5 can be influenced, and installation of the hub motor can also be influenced. Therefore, the scheme provides that the tail plane is not protruded out of the outer end face of the separation section 10 after the pin is installed, and the rotation of the rotating shaft 5 is not influenced.

In addition, the pin is a cuboid, the pin is in interference fit with the pin groove, the pin is knocked into the pin groove through strong force, the shape of the pin of the cuboid is regular, the structure is uniform, compared with other shapes, the cuboid is obtained without excessive processing, the cost is low, and the fixing function of the pin can be met.

Alternatively, the pin may be a cylinder, and the pin slot may also be a cylinder. The pin is a cylinder, all directions of the pin of the installed cylinder are subjected to the same force, the resultant force of the stress of the cylindrical surface is zero, and therefore the pin is long in service life and not easy to damage. Therefore, the pin provided by the scheme is designed to be a cylinder, and the mechanical property is good.

The number of the pins is one, the side wall of the central hole 7 is provided with a pin groove, and the pins are matched and fixed with the pin groove.

In the scheme, the number of the pins for fixing one rotating shaft 5 and one rotor is one, the rotating shaft 5 and the rotor reach firmer formation degree after being matched by threads, the pins are used for ensuring that the rotating shaft 5 and the rotor cannot be loosened, namely, only the pins are needed to prevent the rotating shaft 5 from rotating towards the loosening direction relative to the rotor, and then one pin can meet the fixing requirement. Therefore, the scheme provides that the number of the pins for fixing one rotating shaft 5 and one rotor is one, the cost is low, and the fixing function is met.

Alternatively, referring to fig. 5 and 6, the number of the pins is multiple, and the side wall of the central hole 7 is provided with corresponding pin grooves, and the pins are matched and fixed with the pin grooves. The pins are the same, and included angles among the pins after installation are the same.

The number of the pins is multiple, after the rotating shaft 5 and the rotor are installed, the installation is fixed through the pins, if only one pin is used for fixing, the fixing requirement can be met initially, but under the condition that the wheel 2 is used for bearing for a long time, deformation of materials is inevitable, if the materials near the pins or per se deform, the relative fixing of the rotating shaft 5 and the rotor can be influenced, and if the rotating shaft 5 and the rotor are fixed together through the pins, the pins correspond to each other, the relative fixing between the rotating shaft 5 and the rotor is strengthened, and the fixing effect is better. The contained angle equals between the round pin after the installation, at first from the structure angle, the round pin distributes evenly, and the structure is pleasing to the eye, then from fixed effect analysis, if the contained angle between the round pin is not equal, so every atress of round pin just is unequal, can cause the difference for a long time, influences holistic fixed effect. Consequently, this scheme provides the contained angle between the round pin after the installation and equals, and the structure is pleasing to the eye and fixed effectual.

Referring to fig. 7, the in-wheel motor includes a circuit line 18, the rotating shaft 5 includes a line hole section, the line hole section is connected with the fixing section 6, the line hole section is used for passing through the circuit line 18, and the line hole section is an assembling structure. The wire passing hole section comprises a main body 19 and an auxiliary body 20, a sliding groove is formed in the main body 19, a sliding rail is arranged on the auxiliary body 20, and the sliding rail and the sliding groove are in sliding fit to achieve assembly of the wire passing hole section.

The inside of main part 19 is provided with first recess, first recess is a recess, main part 19 is including crossing the line hole, it is a through-hole and first recess intercommunication to cross the line hole, cross the one end that the line hole set up to be close to fixed section 6 in main part 19, the inside of vice body 20 is provided with the second recess, the second recess is a recess, first recess, second recess and cross the line hole cooperation and form the through wires hole and be used for placing the circuit, main part 19 includes fixed plane 21, fixed plane 21 is a sunken step face in the main part 19, and the face of main part 19 and the cooperation contact of vice body 20 is called the interface, the interface with fixed plane 21 is parallel. The depth of the first recess of the main body 19 is equal to the depth of the second recess of the secondary body 20.

In this scheme, cross the line hole section and assemble through sliding, the sliding assembly need not just can realize with the help of extra fixed knot structure, and is fixed effectual moreover, only need slide rail along the spout during the installation, very conveniently cross the equipment of line hole section.

In addition, the interface is parallel to the fixed plane 21, after the wheel 2 is fixed, the direction of the main force received on the rotating shaft 5 is the same as the normal direction of the fixed plane 21, if the interface is parallel to the fixed plane 21, the sub-body 20 and the main body 19 also receive the force in the same direction as the normal direction of the interface, at this time, the force received by the sliding rail and the sliding groove is small, the sliding rail and the sliding groove cannot be damaged, if the interface is not parallel to the fixed plane 21, a large part of the force received by the main body 19 and the sub-body 20 can be received by the sliding rail and the sliding groove, so that the stress performance of the main body 19 and the sub-body 20 is reduced, deformation is easily generated. Therefore, the scheme provides that the interface of the main body 19 and the auxiliary body 20 is parallel to the fixed plane 21 on the main body 19, and the stress performance of the assembled rotating shaft 5 is better.

In addition, the depth of the first groove of the main body 19 is equal to the depth of the second groove of the auxiliary body 20, the main body 19 and the auxiliary body 20 respectively comprise half of the threading holes, the opening of the threading holes is 180 degrees relative to the installation angle of the line, the opening is the largest at the moment, and half of the threading holes are used for placing the line before installation, so that the line is fixed to a certain extent, and the installation process of the line can be facilitated.

Alternatively, the depth of the first groove of the main body 19 may be greater than the depth of the second groove of the sub body 20.

The degree of depth of first recess is greater than the degree of depth of second recess, so that the main part 19 includes a majority of through wires hole that this is said, in the circuit installation, will pass the through wires hole with the circuit earlier, then half fix the circuit in the through wires hole of main part 19, install vice body 20 at last, fix the circuit, in half fixed in-process, because the circuit is softer, it is not very convenient to fix, and main part 19 including a majority of through wires hole can constitute more and more encirclement to the circuit, make the circuit "go out difficultly in easily", this installation of vice body 20 after also making things convenient for. Therefore, the scheme provides that the interface of the main body 19 and the auxiliary body 20 deviates from the position of the auxiliary body 20, thereby facilitating the fixation of the circuit during installation.

Referring to fig. 8, the rotor includes an insulating spacer for insulation, the insulating spacer includes a vertical insulating spacer 22, the vertical insulating spacer 22 is perpendicular to the axial direction of the rotating shaft 5, and the vertical insulating spacer 22 is an integrally formed structure.

Vertical insulating pad 22 on the rotor designs to be a whole, and vertical insulating pad 22 on the rotor of the 2 hub motors of electrodynamic balance wheel now is all relatively independent, need during the installation to alternate in the rotor by one, and the installation back needs every vertical insulating pad 22 to all align moreover, and installation effectiveness is low like this, if design vertical insulating pad 22 as a whole, in so only needing to insert the rotor during the installation, can align naturally, improves the efficiency of installation. Therefore, the scheme provides that the vertical insulating gasket 22 on the rotor is designed into a whole, and the installation of the vertical insulating gasket 22 is convenient.

The insulating spacers include vertical insulating spacers 22 and horizontal insulating spacers that are seamlessly bonded to vertical insulating spacers 22. The horizontal insulating gasket comprises an inner side horizontal insulating gasket 24 and an outer side horizontal insulating gasket 23, one side of the vertical insulating gasket 22 is matched with the outer side horizontal insulating gasket 23, the other side of the vertical insulating gasket 22 is matched with the outer side horizontal insulating gasket 23, and the vertical insulating gasket 22 and the outer side horizontal insulating gasket 23 are arranged into a whole. The integrated horizontal and vertical insulating spacers 22 include a joint, which is a portion of the vertical insulating sheet in contact with the outside horizontal insulating sheet, and the corner of the joint is a rounded corner. The vertical insulating gasket 22 comprises a first end face and a second end face, the horizontal insulating gasket comprises an inner side horizontal insulating gasket 24 and an outer side horizontal insulating gasket 23, the first end face is overlapped with the outer end face of the outer side horizontal insulating gasket 23, the outer end face of the outer side horizontal insulating gasket 23 is one end close to the separation section 10, the second end face is overlapped with the outer end face of the inner side horizontal insulating gasket 24, and the outer end face of the inner side horizontal insulating gasket 24 is one face which is not in contact with the vertical insulating gasket 22.

The rotor includes a rotor core 25, the rotor core 25 is matched with the rotating shaft 5, the rotor core 25 includes a coil slot 26 and gears, the coil slot 26 is a space between the gears, the area of the outer surface of the vertical insulating spacer 22 is equal to the area of the inner surface of the coil slot 26, the outer surface of the vertical insulating spacer 22 is a surface in contact with the coil slot 26, and the inner surface of the coil slot 26 is a surface in contact with the vertical insulating spacer 22. The rotor core 25 comprises an electronic component 29 and teeth 30, the electronic component 29 is fixed on the teeth 30, and the outer contour diameter of the horizontal insulating spacer is equal to the outer contour diameter of the coil slot 26.

Horizontal insulating pad and vertical insulating pad 22 seamless combination, if have the gap between horizontal insulating pad and the vertical insulating pad 22, then the coil just has the condition with rotor core 25 contact, can make in-wheel motor function failure like this, only makes horizontal insulating pad and vertical insulating pad 22 seamless combination, just can guarantee isolated coil and rotor core 25, makes in-wheel motor normal operating. Thus, the present solution provides a seamless combination of horizontal and vertical insulating spacers 22, preventing the coils from contacting the rotor core 25.

In addition, the vertical insulating gasket 22 and the horizontal insulating gasket are designed into a whole, the whole structure sealing effect is better, the coil winding is more convenient, the coil and the rotor are better isolated, meanwhile, the vertical insulating gasket 22 and the horizontal insulating gasket on the outer side are installed together, the process of one-step separate installation is reduced, and the installation efficiency is improved. Therefore, this scheme provides vertical insulating gasket 22 and outside horizontal insulating gasket 23 design as a whole, and insulating function is better and the installation effectiveness is high.

In addition, the area of the outer surface of the vertical insulating spacer 22 is equal to the area of the inner surface of the coil slot 26, so that when the vertical insulating spacer 22 is installed, the interaction force between the outer surface of the vertical insulating spacer 22 and the surface of the coil slot 26 is just right, and the vertical insulating spacer cannot slip after being released, and cannot be too tight and difficult to insert. Therefore, the area of the outer surface of the vertical insulating spacer 22 is the same as the area of the inner surface of the coil slot 26 of the rotor core 25, which facilitates the fixation of the vertical insulating spacer 22 during the initial installation.

In addition, the outer contour diameter of the horizontal insulating spacer is equal to the outer contour diameter of the coil slot 26, so that the teeth 30 have surplus space relatively, the electronic element 29 is convenient to fix, and compared with the existing hub motor of the electric balance car, the scheme can save materials and functionally ensure that the coils cannot contact with the teeth 30 when being wound. Thus, the present solution provides that the outer diameter of the horizontal insulating spacers is designed to be equal to the outer diameter of the coil slots 26, saving material and providing sufficient space for mounting of the electronic components 29 on the rotor.

In addition, level and vertical integrative insulating pad joint outside corner design are for the radius angle structure, if the joint does not do the processing, structural straight corner, when the coil winding, straight corner has one to prop up the coil, lead to the coil to produce the space in straight corner, make the winding efficiency of coil low, both extravagant coil leads to the coil to be poor in the function again, if the joint designs for the radius angle structure, so the coil can smooth transition pass through, can avoid a series of problems that appear above. Consequently, this scheme provides level and vertical integrative insulating gasket joint department outside turning design for the fillet structure, and coil winding effect is better.

In addition, the first end face and the second end face of the installed vertical insulating gasket 22 are respectively overlapped with the outer end faces of the horizontal insulating gaskets on the two sides, that is, the width of the vertical insulating gasket 22 is equal to the width of the rotor core 25 plus the thickness of the horizontal insulating gaskets on the two sides, if the width of the vertical insulating gasket 22 is smaller than the width of the rotor core 25 plus the thickness of the horizontal insulating gaskets on the two sides, the positioning effect is not good when the horizontal insulating gasket is installed, and the horizontal insulating gasket 22 and the vertical insulating gasket 22 are not completely embedded structurally, so that the appearance is irregular and beautiful; if the width of the vertical insulating spacers 22 is greater than the width of the rotor core 25 plus the thickness of the horizontal insulating spacers on both sides, material is wasted. Therefore, the scheme provides that the two end faces of the installed vertical insulating gasket 22 are respectively superposed with the outer end faces of the horizontal insulating gaskets on the two sides, so that the horizontal insulating gaskets are convenient to fix, and the structure is neat and attractive.

Referring to fig. 8 and 9, the inner horizontal insulating spacer 24 includes a protruding structure 27 and a through hole, the through hole is disposed in the center of the inner horizontal insulating spacer 24, the protruding structure 27 is disposed in the edge region of the through hole, the protruding structure 27 protrudes from the surface of the inner horizontal insulating spacer 24, the rotor core 25 includes a recessed structure 28, the recessed structure 28 is recessed from the surface of the rotor core 25, and the protruding structure 27 and the recessed structure 28 cooperate with each other to realize the installation and positioning of the horizontal insulating spacer. The height of the protrusions of the protruding structures 27 is equal to the depth of the recessions of the recessed structures 28. Protruding structure 27 is the cuboid, recessed structure 28 is the cuboid, the installation location of horizontal insulating gasket is realized with sunken cuboid installation cooperation to bellied cuboid. The number of the convex cuboid and the number of the concave cuboid are both one.

The locating structures matched with each other are designed on the inner side horizontal insulating spacer 24 and the rotor core 25, and because the horizontal insulating spacer needs to be fixed at a proper position when being installed, subsequent installation of other components is facilitated, and the cost of the rotor core 25 material is higher than that of the horizontal insulating spacer, the convex structure 27 is designed on the inner side horizontal insulating spacer 24, and the groove structure is designed on the rotor core 25, so that the cost is saved. Therefore, the scheme provides a positioning structure which is matched with each other on the horizontal insulating gasket and the rotor core 25, and facilitates the installation and positioning of the horizontal insulating gasket.

In addition, the height of the protrusion of the protruding structure 27 is equal to the depth of the recess of the recessed structure 28, so that there is no gap between the protruding structure 27 and the recessed structure 28 after the protruding structure and the recessed structure are installed in a matching manner, and thus there is no moving space for the horizontal insulating gasket, so that the horizontal insulating gasket is stably positioned.

In addition, protruding structure 27 and recessed structures 28 all design for the cuboid, and the cuboid shape is more regular, and after protruding cuboid and sunken cuboid cooperation, it is effectual to the rotation of horizontal insulating gasket and horizontal migration's restraint, also makes horizontal insulating gasket's fixed effect better.

In addition, protruding cuboid and sunken cuboid quantity all design singly, because the protruding of cuboid is fixed effectual with sunk structure 28 cooperation back, and consider that horizontal insulating gasket can not receive rotation or horizontal slip's power in using moreover, so protruding cuboid and sunken cuboid quantity all designs into one, then the mutual installation cooperation can satisfy horizontal insulating gasket's fixed effect, and the cost is lower.

As another embodiment of the present invention, it is different from the above embodiments in that the pin includes an insertion section and a starting section, the insertion section is connected with the starting section, the diameter of the insertion section is larger than that of the starting section, the insertion section of the pin is provided with threads, the first pin groove 8 and the second pin groove 9 are respectively provided with threads, and the pin groove are fixed by threads in a matching manner.

The starting section comprises an outer end face and an inner end face, the inner end face is connected with the inserting section, the outer end face and the inner end face are arranged oppositely, a groove is formed in the outer end face, and the groove is matched with a disassembling tool to achieve disassembling and assembling of the pin. The groove is in a rectangular strip shape. The groove comprises a notch, the notch is arranged to be a chamfer, and the chamfer inclines towards the inside of the groove. The outer end face of the starting section does not protrude out of the outer end face of the central hole 7, and the outer end face of the central hole 7 is a face close to the separating section 10.

The pin is installed and fixed by threads, the existing pin and the pin groove for fixing the rotating shaft 5 and the rotor are realized by interference fit, the installation difficulty is high, the surface of a part subjected to knocking force can generate knocking marks during installation, and the pin is an installation method for damaged elements. Consequently, the round pin that this scheme provided adopts the screw thread installation fixed, easy to assemble.

In addition, the initial section of the pin is designed with a groove matched with a disassembling tool, because the pin is installed through thread rotation, the pin is required to have a structure which can apply force with rotation, the installation position of the pin is considered to be narrow, the pin is difficult to install only through a hand of a person, the pin is required to be installed through a tool, and the existing general-purpose tool generally acts in the groove structure to realize the rotating disassembling function, such as a screw 33 and a screwdriver. Therefore, the large end of the pin is provided with the groove matched with the disassembling tool, and the pin and the disassembling tool are convenient to disassemble and assemble.

In addition, after the pin is installed, the outer end face of the initial section does not protrude out of the outer end face of the central hole 7, namely, the installed pin does not protrude out structurally, so that the structural integrity is firstly seen to be strong, the appearance is attractive, then the initial section is also located between the rotating shaft 5 and the rotor, the matching of the fixed rotating shaft 5 and the rotor can be achieved, compared with the condition that the outer end face of the initial section protrudes out of the outer end face of the central hole 7, the fixing effect of the structure is better, and the diameter of the initial section is larger, so that the fixing function of the pin can be enhanced. Therefore, the outer end face of the initial section does not protrude out of the outer end face of the central hole 7 after the pin is installed, so that the structure is attractive, and the fixing effect is better.

In addition, the groove is designed to be rectangular strip-shaped, the existing universal screw disassembling tool comprises a flat-head screwdriver, and the screwdriver can realize the disassembling and assembling of the pin. Therefore, the design of the groove is rectangular strip, and the flat screwdriver is convenient to disassemble and assemble.

Alternatively, the grooves may be in the shape of a cross.

The groove is designed into a cross-flower shape, the existing universal screw dismounting tool comprises a cross-flower-shaped screwdriver and a flat-head screwdriver, the cross-flower-shaped screwdriver is common in life and complete in specification, compared with the flat-head screwdriver, the head of the cross-flower-shaped screwdriver is provided with four convex edges for applying force, the head of the flat-head screwdriver is only provided with one edge, when the two kinds of screwdrivers act on respective grooves for normal use, the flat-head screwdriver can damage the grooves more easily, and once one corner of the groove matched with the flat-head screwdriver is damaged, the groove can not be normally used any more. Therefore, this scheme provides the recess design and is the cross flower shape, facilitates the use cross flower shape screwdriver dismouting round pin.

Alternatively, the grooves may be regular hexagons.

The groove is designed to be regular hexagon, namely, referring to the inner countersunk head hexagon screw 33, a hexagon wrench in the existing screw 33 dismounting tool can be wide in application range, low in cost and complete in specification, compared with a traditional screwdriver, the hexagon wrench can flexibly change the use direction to fasten the countersunk head hexagon screw 33, dismounting can be achieved even if the countersunk head hexagon screw 33 is used in a narrow position, force is equally divided into six angles by the hexagon wrench, and the countersunk head hexagon screw 33 is greatly protected. Consequently, this scheme provides the recess design and is regular hexagon, facilitates the use hexagonal spanner dismouting round pin.

As another embodiment of the present invention, referring to fig. 10 and 11, the difference between the above embodiments is that the thread passing hole section includes a fixing member, a first fixing position is disposed at a tail end of the main body 19, the tail end of the main body 19 is an end far away from the rotor, a second fixing position is disposed at a tail end of the auxiliary body 20, the tail end of the auxiliary body 20 is an end far away from the rotor, the first fixing position and the second fixing position are matched to form a complete fixing position, and the fixing member is installed and matched with the complete fixing position.

The surface of first fixed position is provided with the screw thread, the surface of the fixed position of second is provided with the screw thread, first fixed position with the cooperation of the fixed position of second forms a bolt 32, the mounting is nut 31, nut 31 inside wall is provided with the screw thread, bolt 32 and nut 31 installation cooperation.

The wheel 2 comprises an inner wheel bearing 35, the nut 31 is an annular cylinder, the outer diameter of the nut 31 is not larger than the outer diameter of the wire passing hole section, and the wire passing hole section is in penetrating fit with the inner wheel bearing 35. Nut 31 is including interior circle and excircle, the surface of excircle is provided with a plane, the distance of axis to plane of nut 31 is greater than the interior circle radius of nut 31 and is less than nut 31 excircle radius.

Nut 31 includes the outer terminal surface, the outer terminal surface of nut 31 is towards the terminal one side of pivot 5 after nut 31 and bolt 32 cooperate, cross the line hole section and include outer terminal surface, cross the outer terminal surface of line hole section and be the terminal of pivot 5, the outer terminal surface of nut 31 and the outer terminal surface coincidence of line hole section.

In the scheme, the assembled main body 19 and the assembled auxiliary body 20 are fixed through the fixing piece, if the assembled main body 19 and the assembled auxiliary body 20 are not fixed through the fixing piece, the main body 19 and the auxiliary body 20 can be separated, and the main body 19 and the auxiliary body 20 can be ensured not to be separated through the fixing piece after installation, so that the assembled main body 19 and the assembled auxiliary body 20 are firmer.

In addition, the fixing piece selects the nut 31, the bolt 32 formed by the first fixing position and the second fixing position has a tightening force after the nut 31 is installed, the tightening force has 360-degree limiting effect on the main body 19 and the auxiliary body 20, the threads of the first fixing position and the second fixing position and the threads of the nut 31 have limiting effect parallel to the direction of the central line of the rotating shaft 5 on the main body 19 and the auxiliary body 20, and therefore the main body 19 and the auxiliary body 20 after the nut 31 can be well fixedly installed, and meanwhile, the nut 31 is simple and convenient to install. Consequently, nut 31 is selected for use to the mounting that this scheme provided, and is fixed effectual, simple to operate.

In addition, the outer diameter of the nut 31 is not larger than the outer diameter of the line hole section, if the outer diameter of the nut 31 is larger than the outer diameter of the line hole section, the line hole section is difficult to penetrate through the inner wheel bearing 35, and the outer diameter of the nut 31 is not larger than the outer diameter of the line hole section, so that the rotating shaft 5 and the inner wheel bearing 35 can be conveniently penetrated and matched.

In addition, a plane is designed on the outer circle of the nut 31, the nut 31 is used for fixing the main body 19 and the auxiliary body 20 after installation, the nut 31 is required to be firm after installation, certain twisting force needs to be applied to the nut 31 during installation, if force is applied to the cylindrical surface, the nut 31 cannot be screwed, force is not conveniently applied, after the plane is designed on the outer cylindrical surface of the nut 31, fingers or force applying tools can act on the plane, force is conveniently applied, and the nut 31 can be fixed more tightly. Therefore, the scheme provides a design plane on the excircle of the nut 31, and facilitates the force application when the nut 31 is installed.

In addition, the outer end face of the mounted nut 31 is overlapped with the outer end face of the wire passing hole section, so that the whole structure of the mounted nut 31 has a reinforcing effect on the main body 19 and the auxiliary body 20, the fixing effect on the mounted main body 19 and the mounted auxiliary body 20 is better, and the appearance structure is neat and attractive. Therefore, the outer end face of the nut 31 after installation is coincided with the outer end face of the wire passing hole section, and the fixing effect is good.

Optionally, the surface of the outer circle of the nut 31 is a rough surface, and the surface of the outer circle of the nut 31 is a force application surface when the nut 31 is installed.

The outer circle surface of the nut 31 is designed to be a rough surface, and because the outer circle surface is a force application surface when the nut 31 is installed, the rough surface can increase friction force, the force application effect is good, and the nut 31 is convenient to install.

Optionally, the internal surface of the first fixed position of main part 19 is provided with the screw thread, the internal surface of the second fixed position of auxiliary body 20 is provided with the screw thread, the mounting is screw 33, the internal thread constitutes the internal thread hole after main part 19 and the installation of auxiliary body 20, internal thread hole and screw 33 installation cooperation. The screw 33 comprises a head and an insertion section, the complete fixing position comprises an insertion groove and a matching groove, the diameter of the matching groove is larger than that of the insertion groove, the insertion section of the screw 33 is inserted into the insertion groove, the head of the screw 33 is matched with the matching groove, the head end face of the screw 33 is overlapped with the outer end face of the wire passing hole section, the head end face of the screw 33 is an end face far away from the insertion section, and the outer end face of the wire passing hole section is the tail end of the rotating shaft 5.

The fixing part adopts a screw 33, the relative movement of the main body 19 and the auxiliary body 20 after installation can be limited by the screw 33, the main body 19 and the auxiliary body 20 after installation are fixed by the aid of the screw 33, and the screw 33 is simple and convenient to install.

In addition, the end face of the head of the mounted screw 33 coincides with the outer end face of the wire passing hole section, and after the screw 33 is mounted, the head is hidden in the wire passing hole section, namely the end face of the head coincides with the outer end face of the wire passing hole section, so that the appearance is high in integrity and beautiful, and the screw 33 completely enters the wire passing hole section to fixedly mount the main body 19 and the auxiliary body 20. Therefore, the scheme provides coincidence of the end face of the head of the mounted screw 33 and the outer end face of the wire passing hole section, and is attractive and good in fixing effect.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims (9)

1. The utility model provides an in-wheel motor of electrodynamic balance car, a serial communication port, electrodynamic balance car includes the automobile body and is fixed in the wheel of automobile body both sides, the wheel includes in-wheel motor, in-wheel motor includes pivot, rotor and round pin, the pivot includes the canned paragraph, the canned paragraph sets up the screwed region for the surface of pivot, the surface of canned paragraph is provided with first cotter way, first cotter way is a recess, the rotor includes the centre bore, the centre bore is a through-hole, the inside wall of centre bore is provided with the screw thread, the inside wall of centre bore is provided with the second cotter way, the second cotter way is a recess, pivot and rotor are installed through the thread fit of the canned paragraph of pivot and the centre bore of rotor, first cotter way with the cooperation of second cotter way forms the cotter way, the round pin is fixed with the cotter way cooperation, in-wheel motor includes the circuit line, the rotating shaft comprises a wire passing hole section, the wire passing hole section is connected with the fixing section and used for passing a circuit wire, and the wire passing hole section is of an assembling structure;

the pin comprises an insertion section and an initial section, the insertion section is connected with the initial section, the diameter of the insertion section is larger than that of the initial section, the insertion section of the pin is provided with threads, the first pin groove and the second pin groove are respectively provided with threads, and the pin groove are matched and fixed through the threads;

the starting section comprises an outer end face and an inner end face, the inner end face is connected with the inserting section, the outer end face and the inner end face are arranged oppositely, the outer end face is provided with a groove, and the groove is matched with a disassembling tool to realize the disassembling and assembling of the pin;

the wire passing hole section is connected with the fixed section and comprises an outlet section, the outlet section is one end of the wire passing hole section close to the fixed section, and the diameter of the outlet section is larger than that of the fixed section; the wire passing hole section comprises a main body and an auxiliary body, a sliding groove is formed in the main body, a sliding rail is arranged on the auxiliary body, and the sliding rail and the sliding groove are in sliding fit to achieve assembly of the wire passing hole section.

2. The in-wheel motor of an electrodynamic balance car of claim 1, characterized in that the inside of the main body is provided with a first groove, the first groove is a groove, the main body includes a wire passing hole, the wire passing hole is a through hole and communicates with the first groove, the wire passing hole is arranged at one end of the main body near the fixed section, the inside of the secondary body is provided with a second groove, the second groove is a groove, the first groove, the second groove and the wire passing hole cooperate to form a threading hole for placing a circuit, the main body includes a fixed plane, the fixed plane is a sunken step surface in the main body, a surface where the main body and the secondary body cooperate to contact is called an interface, and the interface is parallel to the fixed plane.

3. The in-wheel motor of an electrodynamic balance car of claim 2, wherein the depth of the first recess of the main body is equal to the depth of the second recess of the secondary body.

4. The in-wheel motor of an electrodynamic balance car of claim 2, wherein the depth of the first recess of the main body is greater than the depth of the second recess of the secondary body.

5. The hub motor of claim 1, wherein the wire passing hole section comprises a fixing member, the tail end of the main body is provided with a first fixing position, the tail end of the main body is an end far away from the rotor, the tail end of the auxiliary body is provided with a second fixing position, the tail end of the auxiliary body is an end far away from the rotor, the first fixing position and the second fixing position are matched to form a complete fixing position, and the fixing member is installed and matched with the complete fixing position.

6. The hub motor of claim 5, wherein the first fixing portion has threads on an outer surface thereof, the second fixing portion has threads on an outer surface thereof, the first fixing portion and the second fixing portion cooperate to form a bolt, the fixing member is a nut, the inner sidewall of the nut has threads thereon, and the bolt is engaged with the nut.

7. The wheel hub motor of claim 6, wherein the wheel comprises an inner wheel bearing, the nut is an annular cylinder, the outer diameter of the nut is not greater than the outer diameter of the wire passing hole section, the wire passing hole section is in inserted fit with the inner wheel bearing, the nut comprises an inner circle and an outer circle, the surface of the outer circle is provided with a plane, and the distance from the central axis of the nut to the plane is greater than the radius of the inner circle of the nut and less than the radius of the outer circle of the nut.

8. The in-wheel motor of an electrodynamic balance car of claim 5, characterized in that, the internal surface of the first fixed position of the main body is provided with screw threads, the internal surface of the second fixed position of the auxiliary body is provided with screw threads, the fixing member is a screw, the rear half internal threads of the main body and the auxiliary body are assembled to form an internal thread hole, the internal thread hole is assembled and matched with the screw, the screw comprises a head and an insertion section, the complete fixed position comprises an insertion groove and a matching groove, the diameter of the matching groove is greater than that of the insertion groove, the insertion section of the screw is inserted into the insertion groove, the head of the screw is matched with the matching groove, the head end surface of the screw coincides with the outer end surface of the wire passing hole section, the head end surface of the screw is an end surface far away from the insertion section, and the outer end surface of the wire passing hole.

9. An electric balance car, characterized in that the electric balance car comprises a car body and wheels fixed on both sides of the car body, wherein the wheels comprise the in-wheel motor according to any one of claims 1 to 8.

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