CN210007593U - vibration motor of electric toothbrush - Google Patents

Abstract

The utility model discloses a electric toothbrush's vibrating motor, including the shell body, the oscillating axle, stator component and rotor component, stator component is including the coil of cover setting in the periphery of oscillating axle, and the circumference sets up in the oscillating axle periphery and fixes two at least sets of magnet groups at the shell body internal wall, magnet group all includes magnet and second magnet, arbitrary adjacent magnet and second magnet polarity on the oscillating axle radial direction are opposite, rotor component is including fixing the magnetizer on the oscillating axle, the periphery of magnetizer has towards two at least boss structures of outside casing's direction bulge, boss structure includes middle boss and the second boss of being separated by the arc wall, after the coil outage, the appeal of magnet group to boss structure can drive the oscillating axle and reply initial balanced position automatically, thereby need not to utilize torsion spring, the structure of vibrating motor has been simplified, thereby the moment of torsion that oscillating axle rotation process consumed has been reduced, the life and the functional stability of vibrating motor has been improved.

Description

vibration motor of electric toothbrush

Technical Field

The utility model relates to a vibrating motor technical field, concretely relates to electric toothbrush's vibrating motor.

Background

As consumer standards continue to improve, electric toothbrushes continue to become the preferred tool for consumer dental care, as do the configurations of magnetic levitation motors employed in electric toothbrushes or other oscillating power tools.

In the prior art, a vibration motor of an electric toothbrush mainly comprises a shell, a swinging shaft, a coil, two rotors, two groups of magnets and a torsion spring plate, wherein the coil, the two rotors and the two groups of magnets are positioned in the shell, the coil and the two rotors are sleeved on the swinging shaft, the two rotors are respectively positioned on two sides of the coil, the two groups of magnets are respectively fixed on the inner wall surface of the shell and are respectively wound on the peripheries of the two rotors, the torsion spring plate is arranged between the end part of the swinging shaft and the shell and has required torsion deformation amount for limiting the swinging of the swinging shaft, after the coil is electrified, the coil generates an electromagnetic field, according to the principle that like poles repel each other and unlike poles attract each other, the acting force between the electromagnetic field and the fixed magnetic field of each groups of magnets drives the rotors and the swinging shaft to swing for required angles so as to drive the toothbrush to vibrate, at the moment, the torsion spring plate twists along with the swinging shaft, and when the coil is stopped to.

However, in the vibration motor with such a structure, the return of the oscillating shaft is mainly achieved by the elastic restoring force of the torsion spring, and the torsion spring has rigidity of degrees, so that most of the torque of the oscillating shaft needs to be absorbed in the process of rotating along with the oscillating shaft, and the output power of the oscillating shaft is weakened, and secondly, the torsion spring has fatigue of degrees, so that the parts are broken or deformed after long-time torsion, and the service life and the function of the whole vibration motor are affected.

SUMMERY OF THE UTILITY MODEL

Therefore, the present invention has been made to solve the above-mentioned problems occurring in the prior art, which is to overcome the problem that the rotor member itself is difficult to return to the equilibrium position after the coil stops supplying power, and to provide kinds of vibration motors for electric toothbrushes.

In order to solve the technical problem, the technical scheme of the utility model as follows:

A vibration motor for an electric toothbrush, comprising:

an outer housing having a mounting cavity;

a swing shaft arranged in the mounting inner cavity, wherein the end of the swing shaft extends out of the outer shell and is connected with a component driven by the swing shaft;

the stator component comprises a coil sleeved on the periphery of the swinging shaft and at least two sets of magnet groups which are uniformly arranged on the periphery of the swinging shaft in the circumferential direction and fixed on the inner wall surface of the outer shell, wherein each set of magnet group comprises an th magnet and a second magnet, and the polarities of any adjacent th magnet and any adjacent second magnet in the radial direction of the swinging shaft are opposite;

the rotor component comprises magnetizers which are fixed on the swing shaft and rotatably arranged at the centers of at least two sets of magnet groups, the peripheries of the magnetizers are provided with at least two boss structures which protrude towards the direction of the outer shell and are uniformly distributed in the circumferential direction, and each boss structure comprises a -th boss and a second boss which are separated by an arc-shaped groove in the middle.

, the boss and the second boss are provided with concave parts which are concave towards the inner side at the connection part of the magnetizer body.

, the length of each of the magnet and the second magnet is larger than the length of the magnetic conductor in the axial direction of the swinging shaft.

, the stator component further comprises a coil rack arranged on the periphery of the oscillating shaft, the two ends of the coil rack are provided with annular baffles, and the coil is arranged on the coil rack and the two ends of the coil rack are limited by the annular baffles respectively.

, the outer shell comprises a th shell and a second shell which enclose a hollow cylindrical cavity with two open ends, and two end covers which are respectively arranged at two ends of the th shell and the second shell to close the open ends of the hollow cylindrical cavity, wherein the end covers and the corresponding ring baffles form a limit space of the magnet group in the axial direction of the swinging shaft.

, the end cover has several limit bosses protruding towards the direction corresponding to the magnet group and located between the adjacent boss structures to limit the rotation stroke of the magnetizer.

, the contact surface of the end cap and the magnet group is provided with a plurality of positioning grooves for the end of the magnet or the second magnet to be embedded in to position the magnet group.

, a limiting sheet is arranged on the contact surface of the annular baffle and the magnetizer, and the limiting sheet is provided with a limiting end surface for limiting the magnet assembly to move in the radial direction of the swinging shaft and a limiting flange for limiting the magnet assembly to rotate in the circumferential direction of the swinging shaft.

, the rotor component further comprises an inner shaft sleeve sleeved on the periphery of the oscillating shaft and an outer shaft sleeve sleeved on the periphery of the inner shaft sleeve and driven by the magnetizer to rotate, and the inner shaft sleeve and the outer shaft sleeve are both magnetism increasing components.

, the outer shell is made of magnetic conductive material.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a vibration motor of electric toothbrush, when the coil is in the circular telegram state, the magnetic induction line that the coil produced the electromagnetic field concentrates on the magnetizer of rotor component, make the boss structure' S that the magnetizer is the polarity the same (all N utmost point or all S utmost point), and magnet adjacent in magnet group and the second magnet inner end that is close to boss structure polarity opposite ( 0 is the N utmost point, another is the S grade), produce appeal and repulsion to boss structure, similar to other magnet groups also can produce appeal and repulsion to corresponding boss structure, these appeal and repulsion direction are the same, all drive the magnetizer and make clockwise or anticlockwise rotation, thereby drive the oscillating shaft and rotate from side to side, realize the vibration function of electric toothbrush, simultaneously, when the coil is in the not electrified state, the polarity of boss structure on the magnetizer also disappears gradually, with magnet and second magnet in the magnet group all produce the boss structure and the appeal to boss structure, under this oscillating action, the initial oscillation shaft and the oscillating shaft torsion of magnet can reduce the influence of the torsional torsion of the oscillating shaft and the torsional vibration of the initial position, thereby the life of the motor can be simplified and the life of the motor through the torsional vibration reduction of the torsional deformation of the torsional vibration motor, the initial balance of the torsional vibration motor, the life of the spring can be reduced by the use of the initial power consumption of the spring, thus simplified version of the life of the spring can be utilized under the life-saving.

2. The utility model provides an electric toothbrush's vibrating motor, the boss and the second boss of boss structure are separated by the arc wall that is located the centre, boss structure produces the polarity under the appeal effect of magnet and second magnet that two polarities are different, and two magnetic poles of boss structure can concentrate on boss and second boss respectively, thereby the magnet produces attraction effect to the boss that it is close to, the second magnet produces attraction effect to it being close to the second boss, only when boss structure is located the middle axial position of magnet and the second magnet that corresponds, the resultant force direction perpendicular to magnetizer's of these two attractions axial direction, boss structure and magnetizer just can be in the balanced steady state of atress, therefore, when the coil is in not electrified state, magnetizer and oscillating axle can reply initial balanced position automatically under the effect of magnet group.

3. The utility model provides an electric toothbrush's vibrating motor, the setting of spacing boss can restrict the rotation stroke of magnetizer on the end cover, avoids boss structure on the magnetizer and magnet group to appear the phenomenon that the corresponding relation dislocated to can advance step and ensure that magnetizer and oscillating axle can automatic re-setting to initial balanced position under the coil does not have the on-state.

4. The utility model provides an electric toothbrush's vibrating motor, spacing piece on spacing recess on the end cover and the ring baffle plays spacing effect to magnet group, can reduce the change that magnet group took place the position, and then the balanced position that makes magnetizer and oscillating axle reply can not change.

5. The utility model provides an electric toothbrush 'S vibrating motor, the periphery at the oscillating axle overlaps in proper order and establishes interior axle sleeve and the outer axle sleeve that can regard as the part that increases magnetism, be in under the on-state when the coil, the electromagnetic field that the coil produced is concentrated including axle sleeve and outer axle sleeve earlier, interior axle sleeve and outer axle sleeve concentrate the electromagnetic field on two magnetizers of transmitting both ends again, wherein magnetizers are the N utmost point, magnetizers then are the S utmost point in addition, two magnetizers carry out magnetic field antiport with stator component, rotor component and oscillating axle can realize more stable and more efficient rotation, and simultaneously, the setting of interior axle sleeve, not only can assist the transmission electromagnetic field, and the dismantlement of the oscillating axle of being convenient for is changed, the oscillating axle can choose the material that does not have the magnetic conduction function for use, also conveniently change the oscillating axle of different materials as required, vibrating motor' S practicality has been improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of an electric toothbrush vibration motor according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an internal structure of an electric toothbrush vibration motor according to an embodiment of the present invention, wherein an outer casing is hidden to show the internal structure;

fig. 3 is an exploded view of an electric toothbrush vibration motor according to an embodiment of the present invention;

fig. 4 is a schematic longitudinal sectional view of an electric toothbrush vibration motor according to an embodiment of the present invention;

fig. 5 is a schematic view of an installation structure of a magnet assembly and a magnetizer on a coil frame according to an embodiment of the present invention;

fig. 6 is a schematic view of an installation structure of a magnet assembly and a magnetizer on an end cover according to embodiment of the present invention;

fig. 7 is a state diagram of a stator component and a rotor component in an initial equilibrium position when not energized as provided by embodiment of the present invention;

fig. 8 is a schematic diagram of the variation of the supply voltage of the coil in embodiment of the present invention with time;

fig. 9 is a schematic view of the magnetic field of the stator member and the rotor member provided in embodiment of the present invention when the supply voltage of the coil is 3.7V;

fig. 10 is a schematic view of the magnetic field of the stator member and the rotor member provided in embodiment of the present invention when the supply voltage of the coil is-3.7V;

fig. 11 is a schematic perspective view of an electric toothbrush vibration motor according to a second embodiment of the present invention;

fig. 12 is an exploded view of the vibrating motor of the electric toothbrush according to the second embodiment of the present invention.

The reference numbers indicate 1, an outer shell, 11, th shells, 12, a second shell, 13, end covers, 131, limit bosses, 132, positioning grooves, 2, a swing shaft, 3, stator components, 31, coils, 32, coil racks, 321, annular baffles, 34, magnet sets, 341, magnets, 342, second magnets, 35, limit pieces, 351, limit end faces, 352, limit flanges, 4, rotor components, 41, magnetizers, 411, boss structures, 4111, bosses, 4112, second bosses, 4113, arc-shaped grooves, 412, concave parts, 42, outer shaft sleeves, 43 and inner shaft sleeves.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiment is a partial embodiment, not a whole embodiment, of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" shall be construed , for example, they may be fixedly connected, detachably connected, or physically connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, and communicating between two elements.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example

The embodiment of the utility model provides a vibration motor of electric toothbrushes, as shown in fig. 1-6, including shell body 1, oscillating axle 2, stator component 3 and rotor component 4.

In this embodiment, the outer casing 1 includes a th casing 11, a second casing 12, and two end caps 13, the th casing 11 and the second casing 12 are disposed along the axial direction of the swing shaft 2, and the th casing 11 and the second casing 12 are disposed in a snap-fit manner to enclose a hollow cylindrical cavity with two open ends, the two end caps 13 are disposed at two ends of the th casing 11 and the second casing 12 respectively to close the openings of the hollow cylindrical cavity to form an installation cavity, the swing shaft 2 has at least ends penetrating through the end caps 13 thereof to be connected to a component driven by the end caps, specifically, the th casing 11 and the second casing 12 are respectively disposed at two ends of the swing shaft 2 along the axial direction, and the end caps 13 are respectively disposed with a slot, and in a corresponding position of the end caps 13, during the assembly process of the vibration motor, the slot on the th casing 11 and the second casing 12 are respectively extended into the corresponding slot on the end caps 13, that is, so that the th casing 11.

In the present embodiment, the stator component 3 includes a coil rack 32 disposed on the outer periphery of the oscillating shaft 2 and a coil 31 disposed on the coil rack 32, the coil rack 32 has a through hole for passing the oscillating shaft 2, the coil rack 32 further has two ring-shaped baffles 321 disposed at two opposite sides of the coil 31 corresponding to the two ends of the oscillating shaft 2 in the axial direction, and the coil 31 is confined on the coil rack 32 between the two ring-shaped baffles 321. the stator component 3 further includes at least two sets of magnet sets 34 disposed on the outer periphery of the oscillating shaft 2 and fixed on the inner wall surface of the outer casing 1 in the circumferential direction, and the at least two sets of magnet sets 34 are disposed on the outer side of the ring-shaped baffles 321 relative to the coil 31. specifically, in the present embodiment, there are four sets of magnet sets 34, and each set of magnet set 34 includes a first magnet and a second magnet 342, and the first magnet and the second magnet 342 are the same in size and shape, and the polarities of any adjacent first .

In the present embodiment, the rotor member 4 includes two magnetic conductors 41 fixed on the swing shaft 2, the two magnetic conductors 41 are respectively located at the outer sides of the two ring-shaped baffles 321 opposite to the coils 31 and are rotatably disposed at the centers of the four sets of magnet groups 34, the periphery of the magnetic conductors 41 has four boss structures 411 protruding toward the outer housing 1 and evenly distributed at intervals in the circumferential direction, the four boss structures 411 have the same shape and respectively include bosses 4111 and 4112 separated by an arc-shaped groove 4113, when the coils 31 are in the non-energized state, the bosses 4111 and 4112 are respectively subjected to the magnetic attraction force of the magnet 341 and the second magnet 342 of the magnet group 34 to enable the magnetic conductors 41 to be reset to the initial equilibrium position, a magnetic gap is provided between the boss structure 411 of the magnetic conductor 41 and the magnet group 34 of the stator member 3, and the magnetic gaps between the four boss structures 411 and the corresponding magnet groups 34 are the same.

The vibration motor provided by the embodiment of the present invention, with reference to fig. 7-10, when the coil 31 is in the energized state, the magnetic induction lines of the electromagnetic field generated by the coil 31 are concentrated on the magnetizer 41 of the rotor member 4, such that the polarities of the boss structures 411 are the same as those of the magnetizer 41 (both N-pole or both S-pole), and the polarities of the magnet 341 and the second magnet 342 in the magnet set 34 near the inner end of the boss structure 411 are opposite ( 1 is N-pole, and is S-pole), attractive forces and repulsive forces are generated to the boss structure 411, and similarly, the other magnet sets 34 also generate attractive forces and repulsive forces to the corresponding boss structures 411, which have the same directions and drive the magnetizer 41 to rotate clockwise or counterclockwise, thereby driving the swing shaft 2 to rotate around its own axis, thereby achieving the vibration function of the electric toothbrush, and when the coil 31 stops being energized, the polarities of the boss structures 411 on the magnetizer 41 gradually disappear, such that the swing shaft 41 rotates clockwise or counterclockwise, thereby reducing the influence on the torsional vibration motor on the initial vibration motor by the torsional vibration motor torque of the swing shaft, and the swing shaft, thereby simplifying the life of the swing motor by using the swing motor, and reducing the influence of the initial vibration motor by the vibration motor, and reducing the lifetime of the vibration motor by using the vibration motor, and reducing the vibration motor by using the initial vibration motor, and reducing the influence of the vibration motor by using the vibration motor, and reducing the lifetime of the vibration motor by using the vibration motor by the initial vibration motor, reducing the vibration motor by the initial lifetime of the vibration motor by using the vibration motor, reducing.

In this embodiment, the th boss 4111 and the second boss 4112 of the boss 411 are separated by an arc-shaped groove 4113 in the middle, the boss 411 generates two polarities by the attractive forces of the th and second magnets 341 and 342 with different polarities, and the two magnetic poles of the boss 411 are respectively concentrated on the th boss 4111 and the second boss 4112, so that the th magnet 341 generates attractive forces on the th boss 4111 adjacent to the boss, and the second magnet 342 generates attractive forces on the boss 4112 adjacent to the boss, and only when the boss 411 is located at the axial position of the corresponding th and second magnets 341 and 342, the resultant force of the two attractive forces is perpendicular to the axial direction of the magnetic conductor 41, so that the boss 411 and the magnetic conductor 41 can be in a stable state of force balance, and therefore, when the coil 31 is not energized, the magnetic conductor 41 and the swing shaft 2 can automatically return to the initial balance position after being at rest under the action of the magnet group 34.

In this embodiment, the th protrusion 4111 and the second protrusion 4112 have a concave 412 that is concave inward at the connection with the body of the magnetic conductor 41, when the coil 31 is not energized, the concave 412 is disposed such that the magnetic pole of the th protrusion 4111 generated by the magnetic force of the th magnet 341 is closer to the th protrusion 4111, and the magnetic pole of the second protrusion 4112 generated by the magnetic force of the second magnet 342 is closer to the second protrusion 4112, so that the attractive force between the th protrusion 4111 and the th magnet 341, the second protrusion 4112 and the second magnet 342 is larger, and the further makes the magnetic conductor 41 automatically return to the initial equilibrium position after being stationary.

In the preferred embodiments of the present embodiment, in order to make the magnet assembly 34 maintain the stability of the installation position better, a limiting space for limiting the magnet assembly 34 in the axial direction of the swing shaft 2 is formed between the two end caps 13 and the ring-shaped baffle 321 of the corresponding coil frame 32, and after the two end openings of the hollow cylindrical cavity are respectively closed by the end caps 13, the end caps 13 can limit the magnet assembly 34, thereby improving the stability of the magnet assembly 34.

In this embodiment, the end cap 13 has two limiting bosses 131 protruding toward the corresponding magnet assembly 34 and located between the adjacent boss structures 411 to limit the rotation stroke of the magnetic conductor 41, and the two limiting bosses 131 are oppositely disposed on the end face of the end cap 13 close to the magnet assembly 34. in the embodiments, the number of the limiting bosses 131 may also be four and are respectively disposed at the middle positions corresponding to the two boss structures 411 on the magnetic conductor 41, and the two limiting bosses 131 on the end cap 13 may limit the rotation stroke of the magnetic conductor 41, thereby avoiding the dislocation of the corresponding relationship between the boss structures 411 on the magnetic conductor 41 and the magnet assembly 34, and further ensuring that the magnetic conductor 41 and the swing shaft 2 can be automatically reset to the initial equilibrium position when the coil 31 is not energized.

In the embodiment, eight positioning grooves 132 are formed in the contact surfaces of the end cover 13 and the magnet group 34, the ends of the -th magnet 341 or the second magnet 342 are embedded in the positioning grooves 132 to position the magnet group 34, the eight positioning grooves 132 are uniformly arranged in the circumferential direction, the ends of the magnet group 34 are limited in the corresponding positioning grooves 132, the four magnet groups 34 are conveniently and uniformly arranged on the periphery of the swinging shaft 2 in the circumferential direction, and the influence of the deviation of the installation positions of the magnet group 34 and the -th magnet 341 and the second magnet 342 on the performance of the vibrating motor is reduced.

In the present embodiment, in order to further improve the stability of the installation position of the magnet assembly 34, a limiting piece 35 protruding in the direction of the magnet assembly 34 is provided on the contact surface of the ring-shaped baffle 321 and the magnetic conductor 41, the limiting piece 35 is provided with a limiting end surface 351 for limiting the movement of the magnet assembly 34 in the radial direction of the oscillating shaft 2 and a limiting flange 352 for limiting the rotation of the magnet assembly 34 in the circumferential direction of the oscillating shaft 2, and the arrangement of the limiting piece 35 enables the balance position returned by the magnetic conductor 41 and the oscillating shaft 2 not to change.

In this embodiment, the rotor member 4 further includes an inner shaft sleeve 43 sleeved on the outer periphery of the swing shaft 2, and an outer shaft sleeve 42 sleeved on the outer periphery of the inner shaft sleeve 43 and driven to rotate by the magnetizer 41, the inner shaft sleeve 43 and the outer shaft sleeve 42 are both magnetism increasing parts, the fixing frame is sleeved on the outer portion of the outer shaft sleeve 42, two magnetizers 41 of the rotor mechanism are sleeved on the outer shaft sleeve 42 and separated from the coil 31 by the annular baffle 321, the magnetic induction lines of the electromagnetic field generated after the coil 31 is electrified are firstly concentrated on the outer shaft sleeve 42, two ends of the outer shaft sleeve 42 are respectively an S pole and an N pole, the outer shaft sleeve 42 further concentrates the electromagnetic field on the two magnetizers 41, so that magnetizers 41 are S poles, and magnetizers 41 are N poles, the two magnetizers 41 and the stator member 3 perform magnetic field reverse rotation, the rotor member 4 and the swing shaft 2 can realize more stable and more efficient rotation, meanwhile, the arrangement of the inner shaft sleeve 43 can not only assist in transferring the electromagnetic field, but also facilitate the detachment of the swing shaft 2, the swing shaft 2 can be made of materials without a replacement function, and the swing shaft 2 can be replaced according to different.

In the present embodiment, the th magnet 341 and the second magnet 342 have the same length in the axial direction of the swing shaft 2 and are each longer than the length of the magnetic conductor 41, and this arrangement can prevent the magnetic conductor 41 from rotating in the radial direction of the swing shaft 2.

In this embodiment, the th casing 11 and the second casing 12 are made of magnetic conductive material, specifically silicon steel sheet, the th casing 11 and the second casing 12 made of magnetic conductive material can better concentrate the magnetic induction lines after the coil 31 is energized on the two magnetizers 41 at the two ends of the coil frame 32, and reduce the magnitude of the current passing through the coil 31 under the condition that the output power of the oscillating shaft 2 is constant.

The utility model provides a vibrating motor of electric toothbrush, as shown in fig. 11-12, with the difference of embodiment , the cross section of shell body 1, annular baffle 321 is the runway type, oscillating axle 2 only end stretches out shell body 1, end is fixed on end cover 13 wherein through the bearing in addition, stator component 3's magnet group 34 only has two sets, and the symmetry sets up at oscillating axle 2 and radial direction's both ends, correspondingly, only has two boss structure 411 that correspond respectively with magnet group 34 on rotor component 4's magnetizer 41.

As an alternative embodiment, the annular baffle 321 may not need to be provided with the limiting piece 35, or the limiting piece 35 is only used for limiting the axial rotation of the magnetic conductor 41 around the oscillating shaft 2, and the limiting piece 35 may be integrally formed on the annular baffle 321 or welded and fixed on the annular baffle 321.

To sum up, the embodiment of the present invention provides a vibration motor of an electric toothbrush, which has the following working principle:

when the coil 31 is in the energized state, the magnetic induction lines of the electromagnetic field generated by the coil 31 are concentrated on the magnetizer 41 of the rotor member 4, so that the polarities of the salient structures 411 on the magnetizer 41 are the same as (both the polarities are N or both the polarities are S), and the polarities of the inner ends, close to the salient structures 411, of the -th magnet 341 and the second magnet 342 in the -th magnet group 34 are opposite ( is N, and the other is S), attractive forces and repulsive forces are generated on the salient structures 411, and similarly, other magnet groups 34 also generate attractive forces and repulsive forces on the corresponding salient structures 411, and the directions of the attractive forces and the repulsive forces are the same and drive the magnetizer 41 to rotate clockwise or counterclockwise, so as to drive the swinging shaft 2 to rotate around the axial direction of the swinging shaft 2, thereby realizing the vibration function of the electric toothbrush;

when the coil 31 is not energized, the polarity of the boss 411 on the magnetic conductor 41 will gradually disappear, and both the -th magnet 341 and the second magnet 342 in the -th magnet group 34 generate an attractive force to the boss 411, and under the attractive force, the magnetic conductor 41 and the swing shaft 2 can automatically return to the initial equilibrium position.

Compared with the prior art, the oscillating shaft 2 does not need to be reset to the initial balance position by using a torsion spring, so that the structure of the oscillating motor is simplified, the simplified oscillating motor can reduce the torque consumed in the process that the torsion spring plate rotates along with the oscillating shaft 2, the current passing through the coil 31 can be reduced under the condition that the output power of the oscillating shaft 2 is fixed, and in addition, also overcomes the influence of the self-breakage or deformation of the torsion spring plate on the service life and the function of the oscillating motor, so that the service life and the function stability of the oscillating motor are improved.

The utility model discloses the main utility model discloses a it is characterized in that boss 4111 and second boss 4112 of boss structure 411 are separated by the arc groove 4113 that is located the centre, boss structure 411 produces the polarity under the attractive force effect of the magnet 341 and the second magnet 342 of two different polarities, and two magnetic poles of boss structure 411 can concentrate on boss 4111 and second boss 4112 respectively, thereby magnet 341 produces attractive force effects to its boss 4111 that is close to, second magnet 342 produces attractive force effects to its second boss 4112 that is close to, only when boss structure 411 is located corresponding magnet 341 and second magnet intermediate shaft 342 linear position, the resultant force direction of these two resultant force directions is perpendicular to the magnetic conductive axis direction of magnetic conductor 41, boss structure 411 and magnetic conductor 41 can be in the steady state of atress equilibrium, therefore, when coil 31 is in the unpowered state, magnetic conductor 41 and swing shaft 2 can return to the initial equilibrium position automatically under the effect of magnet group 34.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1, A vibration motor for an electric toothbrush, comprising:

an outer housing (1) having a mounting cavity;

the swing shaft (2) is arranged in the mounting inner cavity, and the end of the swing shaft extends out of the outer shell (1) and is connected with a component driven by the swing shaft;

the stator component (3) comprises a coil (31) sleeved on the periphery of the swinging shaft (2) and at least two sets of magnet groups (34) which are uniformly arranged on the periphery of the swinging shaft (2) in the circumferential direction and fixed on the inner wall surface of the outer shell (1), wherein each set of magnet group (34) comprises an th magnet (341) and a second magnet (342), and the polarities of any adjacent th magnet (341) and the second magnet (342) in the radial direction of the swinging shaft (2) are opposite;

the rotor component (4) comprises a magnetizer (41) which is fixed on the swinging shaft (2) and is rotatably arranged at the centers of at least two sets of the magnet groups (34), the periphery of the magnetizer (41) is provided with at least two boss structures (411) which protrude towards the direction of the outer shell (1) and are uniformly distributed in the circumferential direction, and each boss structure (411) comprises a boss (4111) and a second boss (4112) which are separated by an arc-shaped groove (4113) in the middle.

2. The vibration motor of an electric toothbrush according to claim 1, wherein each of the th boss (4111) and the second boss (4112) has a recess (412) recessed inward at a connection with the magnetizer (41) body.

3. The vibration motor of an electric toothbrush according to claim 1, wherein the length of each of the th magnet (341) and the second magnet (342) is greater than the length of the magnetic conductor (41) in the axial direction of the swing shaft (2).

4. The vibration motor of an electric toothbrush according to claim 1, wherein the stator member (3) further comprises a bobbin (32) fitted around the outer periphery of the oscillating shaft (2), the bobbin (32) having annular baffles (321) at both ends thereof, the coil (31) fitted over the bobbin (32) and being restricted at both ends thereof by the annular baffles (321).

5. The vibration motor of an electric toothbrush according to claim 4, wherein the outer case (1) comprises th case (11) and second case (12) enclosing a hollow cylindrical cavity with both ends open, and two end caps (13) respectively provided at both ends of the th case (11) and second case (12) to close the opening of the hollow cylindrical cavity, the end caps (13) and the corresponding ring-shaped baffle (321) forming a space for restraining the magnet group (34) in the axial direction of the oscillation shaft (2).

6. The vibration motor of electric toothbrush according to claim 5, wherein the end cap (13) has a plurality of limit bosses (131) protruding toward the direction corresponding to the magnet assembly (34) and located between the adjacent boss structures (411) to limit the rotational stroke of the magnetic conductor (41).

7. The vibration motor of an electric toothbrush according to claim 5, wherein the contact surface of the end cap (13) with the magnet assembly (34) has a plurality of positioning grooves (132) for embedding the ends of the -th magnet (341) or the second magnet (342) to position the magnet assembly (34).

8. The vibration motor of an electric toothbrush according to claim 4, wherein a limiting piece (35) is provided on a contact surface of the annular baffle (321) and the magnetizer (41), and the limiting piece (35) has a limiting end surface (351) for limiting the movement of the magnet assembly (34) in the radial direction of the oscillating shaft (2) and a limiting flange (352) for limiting the rotation of the magnet assembly (34) in the circumferential direction of the oscillating shaft (2).

9. The vibration motor of an electric toothbrush according to claim 1, wherein the rotor member (4) further comprises an inner bushing (43) sleeved on the outer periphery of the oscillating shaft (2), and an outer bushing (42) sleeved on the outer periphery of the inner bushing (43) and driven by the magnetizer (41) to rotate, and both the inner bushing (43) and the outer bushing (42) are magnetism increasing parts.

10. Vibrating motor of an electric toothbrush according to claim 1, characterised in that the outer casing (1) is made of magnetically conductive material.

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