阅读说明：本技术 一种电动牙刷用马达及具有其的电动牙刷 (Motor for electric toothbrush and electric toothbrush with motor ) 是由 黄剑辉 于 2021-09-14 设计创作，主要内容包括：本发明涉及马达技术领域,特别涉及一种电动牙刷用马达及具有其的电动牙刷,所述马达包括外壳,外壳内固定有至少一对转子铁芯组,每个转子铁芯组均包括多个转子铁芯堆叠而成,至少一对转子铁芯组上套设有两个铁芯支架,两个铁芯支架上设有卡槽,且在两个铁芯支架自转子铁芯组的两端套入时,铁芯支架上的卡槽卡接在转子铁芯的铁芯凸部上；本发明通过将用于固定分体式结构的转子铁芯组的铁芯支架设置为周向上的一体式结构,并在轴向上设置为两个铁芯支架拼接的结构,在组装过程中,通过从转子铁芯组的两端分别套入铁芯支架,可方便的对分体式结构的转子铁芯组进行装配固定,显著的提升了装配效率,并确保了转子铁芯组装配到位。(The invention relates to the technical field of motors, in particular to a motor for an electric toothbrush and the electric toothbrush with the motor, wherein the motor comprises a shell, at least one pair of rotor iron core groups are fixed in the shell, each rotor iron core group comprises a plurality of stacked rotor iron cores, two iron core supports are sleeved on the at least one pair of rotor iron core groups, clamping grooves are formed in the two iron core supports, and the clamping grooves in the iron core supports are clamped on iron core convex parts of the rotor iron cores when the two iron core supports are sleeved in from two ends of the rotor iron core groups; according to the invention, the iron core support for fixing the rotor iron core group of the split structure is arranged to be an integral structure in the circumferential direction, and is arranged to be a structure formed by splicing two iron core supports in the axial direction, and the iron core supports are respectively sleeved from two ends of the rotor iron core group in the assembling process, so that the rotor iron core group of the split structure can be conveniently assembled and fixed, the assembling efficiency is obviously improved, and the rotor iron core group is ensured to be assembled in place.)

1. A motor for an electric toothbrush, comprising a housing (10), characterized in that at least one pair of rotor core groups (20) is fixed in the housing (10), each rotor core group (20) comprises a plurality of rotor cores (21) stacked, and the rotor cores (21) comprise core main bodies (211) and core protrusions (212) protruding outward from the outer circumference of the core main bodies (211);

the cover is equipped with two iron core support (30) along axial extension on at least a pair of rotor iron core group (20), is equipped with directional relative draw-in groove (31) of opening on two iron core support (30), and when two iron core support (30) emboliaed from the both ends of rotor iron core group (20), draw-in groove (31) joint on iron core support (30) is on iron core convex part (212) of rotor iron core (21).

2. The motor for the electric toothbrush according to claim 1, wherein the rotor cores (21) are provided at one side with first protrusions (213) and at the other side with first grooves (214), and when the rotor cores (21) are stacked, the first protrusions (213) of one rotor core (21) are fitted into the first grooves (214) of the adjacent rotor core (21).

3. The motor for the electric toothbrush according to claim 1, wherein the slot (31) comprises two parallel and spaced slot wall plates (311) extending outward from the main body portion of the core holder (30), a slot bottom plate (312) is provided between the two slot wall plates (311), and the slot bottom plate (312) is fitted against the end portion of the rotor core pack (20) after the core holder (30) is assembled in place.

4. The motor for the electric toothbrush according to claim 1, wherein the adjacent ends of the two core holders (30) are provided with a second protrusion (32) and a second groove (33), and the second protrusion (32) of the end of one core holder (30) is fitted into the second groove (33) of the end of the adjacent core holder (30).

5. The motor for an electric toothbrush according to claim 4, wherein the second protrusion (32) is a round bar extending in the axial direction, and the second groove (33) is a cylindrical groove extending in the axial direction;

the overhang end of the round bar is an arc end (34) protruding outwards, and the open end of the cylindrical groove is of a flaring structure.

6. The motor for the electric toothbrush according to claim 1, wherein the iron core bracket (30) is provided with clamping portions (35) arranged at intervals along the circumferential direction to be correspondingly matched with the rotor iron core group (20), and both sides of the clamping portions (35) are matched with both sides of the iron core main body portion (211) in an attaching manner.

7. An electric toothbrush having the motor for an electric toothbrush according to any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of motors, in particular to a motor for an electric toothbrush and the electric toothbrush with the motor for the electric toothbrush.

Background

The electric toothbrush makes the brush head generate high-frequency vibration by means of the rapid operation of the motor, instantly decomposes the toothpaste into fine foam, and deeply cleans teeth gaps; meanwhile, the vibration of the brush hair on the brush head can promote the blood circulation of the oral cavity and has a certain massage effect on the gum tissue. Thus, the motor is a major component of the electric toothbrush. The requirements of current electric toothbrushes for motors are: the center balance point of the motor shaft can swing left and right at a very high frequency (200 and 400Hz) and a tiny angle (not more than +/-15 degrees), so that the brush head is driven to swing fast to clean teeth.

In order to realize the left-right swinging of the brush head, a restoring force for restoring the center is required besides a driving force for sudden left-right change. The motor for the electric toothbrush in the prior art generally adopts the mutual action between the magnetic steel and the coil to generate the driving force alternating left and right, the coil is introduced with alternating current to generate the alternating driving force, and most of restoring force structures are provided by springs, but the structure is easy to damage and is not easy to repair, so that the service life of the motor for the electric toothbrush is short. Based on this, a motor for an electric toothbrush is provided in the market, which generates a restoring force by magnetic interaction between magnetic steel and a stator core, and the magnetic force action has no mechanical loss, and has a significant advantage over a motor using a spring to provide the restoring force.

Further, chinese patent with publication number "CN 206977236U" discloses an electric toothbrush and a motor device thereof, wherein the motor device comprises a motor housing and at least 2-pole stator cores symmetrically and fixedly installed in the stator housing, the stator cores are wound with coil windings, the electric toothbrush further comprises at least 2 pairs of pole magnetic steel structures matched with the stator cores, the magnetic steel structures are all fixedly connected to the periphery of the shaft coupling, and the shaft coupling is fixedly connected with a motor shaft. The motor device particularly generates restoring force by magnetic interaction between the magnetic steel and the stator core. However, the above motor apparatus still has the following drawbacks: (1) the stator core and the shell are of an integrated structure, namely two poles of the stator core are of an integrated structure and are connected through the shell, and the shell positioned on the outer ring of the stator core has the minimum wall thickness due to the processing limit, and the minimum wall thickness is unnecessary from the perspective of magnetic conductivity, so that the space occupied by the coil winding is reduced, the number of turns of the coil winding is limited, and the performance of a motor device, especially a motor with a smaller size, is reduced; (2) the magnetic steel is connected with the motor shaft through the rotor core, the rotor core can occupy a certain space, so that the occupied space of the magnetic steel is relatively reduced, the size of the rotor core can not be larger, and the performance of the motor device is further reduced.

In view of the above-mentioned drawbacks, a motor for an electric toothbrush is disclosed in chinese patent publication No. CN210111775U, where the motor for an electric toothbrush includes a housing, a stator core, a coil winding, magnetic members, a motor shaft, and stator supports, each magnetic member is bipolar, a split structure is formed between the housing and the stator core and between the plurality of stator cores, a second gap is formed between two adjacent stator supports, each stator core includes a core main body and a core protrusion protruding outward from an outer periphery of the core main body, the coil winding is attached to an outer surface of the stator support, and the core protrusion is located in the second gap and the coil slot. In the technical scheme, a split structure is adopted between the shell and the stator iron cores, and a split structure is also adopted between every two stator iron cores, so that the structure breaks through the limitation of the stator iron core of an integrated structure on the minimum wall thickness of the outer ring in the prior art, and unnecessary wall thickness space is given up to the coil winding, thereby greatly improving the performance of the motor. However, in the technical scheme, two adjacent stator cores need to be fixed through the stator supports, and because the adjacent side parts of the two stator cores are respectively provided with the stator supports, the two stator cores are difficult to be fixed in place at one time during actual assembly, so that the problem of low assembly efficiency is caused.

Disclosure of Invention

In view of the problems of the prior art, an object of the present invention is to provide a motor for an electric toothbrush, which improves the assembling efficiency of the motor for an electric toothbrush by improving the structure of a stator bracket.

In order to achieve the purpose, the invention adopts the following technical scheme:

a motor for an electric toothbrush comprises a shell, wherein at least one pair of rotor iron core groups are fixed in the shell, each rotor iron core group comprises a plurality of stacked rotor iron cores, and each rotor iron core comprises an iron core main body part and an iron core convex part which protrudes outwards from the periphery of the iron core main body part;

the cover is equipped with two iron core supports along axial extension on at least a pair of rotor iron core group, is equipped with the directional relative draw-in groove of opening on two iron core supports, and when two iron core supports emboliaed from the both ends of rotor iron core group, the draw-in groove joint on the iron core support is on rotor iron core's iron core convex part.

In a further technical scheme, one side of the rotor core is provided with a first protrusion, the other side of the rotor core is provided with a first groove, and when the rotor cores are stacked, the first protrusion on one rotor core is embedded and matched with the first groove on the adjacent rotor core.

In a further technical scheme, the draw-in groove includes the cell wall board of two parallel interval arrangements that outwards extend from the main part of iron core support, is equipped with a groove bottom plate between two cell wall boards, and after the iron core support assembly targetting in place, the groove bottom plate with the tip of rotor iron core group pastes and leans on the cooperation.

In a further technical scheme, the adjacent ends of the two iron core supports are provided with a second protrusion and a second groove, and the second protrusion at the end part of one iron core support is embedded and matched with the second groove at the end part of the adjacent iron core support.

In a further technical scheme, the second protrusion is a round rod extending along the axial direction, and the second groove is a cylindrical groove extending along the axial direction;

the suspension end of the round rod is an arc end which protrudes outwards, and the opening end of the cylindrical groove is of a flaring structure.

In a further technical scheme, be equipped with on the iron core support along the joint portion of circumference interval arrangement and rotor iron core group correspond the cooperation, the both sides of joint portion with the cooperation is leaned on to the both sides of iron core main part.

The invention also provides an electric toothbrush with the motor.

Compared with the prior art, the invention has the following technical effects:

according to the motor for the electric toothbrush, the iron core support for fixing the rotor iron core group with the split structure is arranged to be the integrated structure in the circumferential direction, the iron core support is arranged to be the structure formed by splicing the two iron core supports in the axial direction, and the iron core supports are respectively sleeved into the two ends of the rotor iron core group in the actual assembling process, so that the rotor iron core group with the split structure can be conveniently assembled and fixed, the assembling efficiency is remarkably improved, and the rotor iron core group is ensured to be assembled in place.

Drawings

Fig. 1 is a schematic view illustrating a structure of a motor for an electric toothbrush according to an embodiment of the present invention;

fig. 2 is a radial sectional view showing a motor for an electric toothbrush in accordance with the present invention;

fig. 3 is a schematic view showing a structure of a core support according to the present invention;

fig. 4 is a schematic view showing a structure of a rotor core according to the present invention;

fig. 5 is an exploded view illustrating a motor for an electric toothbrush according to an embodiment of the present invention;

the reference numbers in the figures illustrate: 10. a housing; 101. a bearing chamber; 11. a bearing; 12. a soft shaft sleeve; 13. a shaft sleeve; 14. a tail end cover; 20. a rotor core group; 21. a rotor core; 211. an iron core main body part; 212. an iron core protrusion; 213. a first protrusion; 214. a first groove; 30. an iron core support; 31. a card slot; 311. a trough wall plate; 312. a trough floor; 32. a second protrusion; 33. a second groove; 34. an arc end; 35. a clamping part; 40. a coil winding; 50. a magnetic member; 51. magnetic steel; 52. a gap; 60. a stator core group; 61. a stator core piece; 70. a motor shaft.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified by combining the specific drawings.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As described above, referring to fig. 1 and 2, the present invention provides a motor for an electric toothbrush, comprising a housing 10, at least a pair of rotor core sets 20 fixed in the housing 10, each rotor core set 20 comprising a plurality of rotor cores 21 stacked, the rotor core 21 comprising a core main body 211 and a core protrusion 212 protruding outward from the outer circumference of the core main body 211;

at least a pair of rotor iron core group 20 goes up the cover and is equipped with two iron core support 30 along axial extension, is equipped with the directional relative draw-in groove 31 of opening on two iron core support 30, and when two iron core support 30 cover from the both ends of rotor iron core group 20, draw-in groove 31 joint on the iron core support 30 is on the iron core convex part 212 of rotor iron core 21.

More specifically, in a specific embodiment of the present invention, as shown in fig. 2 and 5, the motor for an electric toothbrush further includes a coil winding 40 wound on each rotor core assembly 20 and fixed in the housing 10, a magnetic member 50 engaged with each rotor core assembly 20, a stator core assembly 60 disposed inside the magnetic member 50 and formed by stacking a plurality of stator core pieces 61, and a motor shaft 70 connected to the stator core assembly 60 and rotatably installed in the housing 10;

wherein, each magnetic part 50 comprises two magnetic steels 51 with different polarities, and the two magnetic steels 51 constituting each magnetic part 50 are arranged along the axial extension of the motor shaft 70, and a gap 52 is provided between the two adjacent magnetic parts 50.

The motor shaft 70 is rotatably installed in the housing 10 through bearings 11 installed at both ends of the housing 10, a soft shaft sleeve 12 is sleeved on the motor shaft 70 inside the bearing 11 at one end, and a shaft sleeve 13 is sleeved on the motor shaft 70 inside the bearing 11 at the other end; wherein, the soft shaft sleeve 12 is made of soft plastic material, such as graphite nylon or teflon material. Through the arrangement of the soft shaft sleeve 12, when the motor shaft 70 performs axial or circumferential reciprocating motion, the shaft sleeve body can automatically adapt to the motion of the motor shaft 70, so that the noise of the motor during working is low, a certain lubricating effect is achieved, and the service life of the motor shaft 70 is longer.

In a specific embodiment of the present invention, as shown in fig. 5, the housing 10 is a tubular casing with an opening at one end and an integral end cover structure at the other end, one side of the integral end cover structure protrudes outward to form a bearing chamber 101 for accommodating the bearing 11, a through hole is formed at the center of the integral end cover for the motor shaft 70 to extend, a tail end cover 14 is arranged at one side of the opening of the housing 10, and the tail end cover 14 is fixed to the opening end of the housing 10 by a snap-fit connection.

In the technical scheme provided by the invention, the iron core supports 30 used for fixing the rotor iron core group 20 with the split structure are arranged into a circumferential integrated structure, and are axially arranged into a structure formed by splicing two iron core supports 30, and in the actual assembling process, the iron core supports 30 are respectively sleeved from two ends of the rotor iron core group 20, so that the rotor iron core group 20 with the split structure can be conveniently assembled and fixed, the assembling efficiency is obviously improved, and the rotor iron core group 20 is ensured to be assembled in place.

Further, according to the present invention, as shown in fig. 4, one side of the rotor core 21 is provided with a first protrusion 213, and the other side is provided with a first groove 214, and when the rotor cores 21 are stacked, the first protrusion 213 of one rotor core 21 is fitted into the first groove 214 of the adjacent rotor core 21. More specifically, the first protrusion 213 and the first groove 214 are both disposed on the core main body portion 211 of the rotor core 21, and it is further preferable that two first protrusions 213 are spaced apart from each other. By providing the first protrusion 213 and the first groove 214 on the rotor core 21, a certain pre-fixing function can be achieved during stacking installation, ensuring the accuracy of assembly and the efficiency of assembly.

Further, according to the present invention, as shown in fig. 3, the slot 31 includes two slot wall plates 311 extending outward from the main body of the core support 30 and arranged in parallel and spaced, a slot bottom plate 312 is disposed between the two slot wall plates 311, and after the core support 30 is assembled in place, the slot bottom plate 312 is fitted against the end of the rotor core assembly 20. Through the structural design of the clamping groove 31, the iron core convex part 212 of the rotor iron core 21 is limited by the groove wall plates 311 on the two sides, and the end part of the rotor iron core group 20 is limited and restrained by the groove bottom plate 312 of the clamping groove 31, so that the assembly precision is improved.

According to the present invention, as shown in fig. 3, as a specific embodiment of splicing two core supports 30, the adjacent ends of the two core supports 30 are provided with a second protrusion 32 and a second groove 33, wherein the second protrusion 32 at the end of one core support 30 is fitted with the second groove 33 at the end of the adjacent core support 30. More preferably, in a specific embodiment of the present invention, the second protrusion 32 is a round rod extending along the axial direction, and the second groove 33 is a cylindrical groove extending along the axial direction; the suspension end of the round rod is an arc end 34 protruding outwards, and the opening end of the cylindrical groove is of a flaring structure. Thus, the arc end 34 of the round rod can be more easily inserted into the cylindrical groove body of the flaring structure, and the embedding matching is realized.

According to the invention, the iron core bracket 30 is provided with the clamping parts 35 which are arranged at intervals along the circumferential direction and are correspondingly matched with the rotor iron core group 20, and two sides of the clamping parts 35 are matched with two sides of the iron core main body part 211 in an attaching manner. The design of the clamping part 35 further limits the position of the rotor core 21, and ensures the accuracy in assembly.

The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.