A double-bearing packaged electric toothbrush motor

Abstract

The present invention provides a motor for an electric toothbrush with dual bearing packaging, comprising a housing and a motor shaft, wherein the housing comprises a first shell and a second shell arranged relative to each other along the axial direction of the motor shaft, wherein the motor shaft is rotatably supported in the first shell by a first bearing and rotatably supported in the second shell by a second bearing; the first shell is provided with a first mounting groove, wherein the first bearing is accommodated in the first mounting groove; the second shell is provided with a second mounting groove, wherein the second bearing is accommodated in the second mounting groove; the first shell is pressed inwardly by the first bearing and the second shell is pressed inwardly by the second bearing, and the first shell and the second shell are clamped and connected. When assembling the motor shaft and the first shell, and the motor shaft and the second shell, it is only necessary to knock in the first bearing from the outside of the first shell and the second bearing from the outside of the second shell accordingly, so that the product packaging is realized and the bearings are installed in one riveting operation, thus saving the installation process and improving the assembly efficiency.

Description

Technical Field

[0001] The invention relates to a motor, in particular to a double-bearing packaged motor for an electric toothbrush. Background Art

[0002] An electric toothbrush mainly consists of a motor and a brush head. The rapid operation of the motor causes the brush head to vibrate at a high frequency, instantly breaking down the toothpaste into fine foam and deeply cleaning the gaps between teeth. At the same time, the vibration of the bristles on the brush head can promote blood circulation in the oral cavity and have a certain massage effect on the gum tissue. Therefore, the motor is a major component of an electric toothbrush.

[0003] Furthermore, the current electric toothbrush motor mainly includes a stator part and a rotor part; wherein the stator part includes a housing, a stator core and a coil winding both fixed to the housing, and the coil winding is wound on the stator core; the rotor part includes a motor shaft rotatably supported in the housing through a bearing, and a permanent magnet fixed to the outer surface of the motor shaft; the stator core and the permanent magnet cooperate. In addition, in the existing electric toothbrush motor, the bearings used to support the motor shaft are all installed on the inner side of the front and rear covers of the housing, and the finished product packaging relies on the housing, resulting in two processes for riveting each bearing and housing, that is, two riveting steps are required. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a motor for an electric toothbrush with a double-bearing package, which can achieve product packaging through a riveting process, thus saving steps.

[0005] To achieve the above object, the present invention provides a double-bearing packaged electric toothbrush motor, comprising a housing, and a motor shaft rotatably supported in the housing by a first bearing and a second bearing, wherein the first bearing and the second bearing are arranged side by side along the axial direction of the motor shaft, the housing comprises a first shell and a second shell arranged opposite to each other along the axial direction of the motor shaft, the motor shaft is rotatably supported in the first shell by the first bearing, and the motor shaft is rotatably supported in the second shell by the second bearing;

[0006] A first mounting groove is formed at an outer end of the first housing facing away from the second housing, and the outer end of the first mounting groove penetrates the first housing outwardly. The first bearing is accommodated in the first mounting groove, and the inner ring of the first bearing is fixedly connected to the motor shaft.

[0007] A second mounting groove is formed at an outer end of the second housing facing away from the first housing, and the outer end of the second mounting groove penetrates the second housing outwardly. The second bearing is accommodated in the second mounting groove, and the inner ring of the second bearing is fixedly connected to the motor shaft.

[0008] The first housing is clamped and connected with the second housing by the first bearing pressing the first housing inward and the second bearing pressing the second housing inward.

[0009] Furthermore, an elastic flexible member is provided between the inner end of the first bearing and the first housing, and / or between the inner end of the second bearing and the second housing.

[0010] Furthermore, the flexible member is a silicone ring.

[0011] Furthermore, the inner ring of the first bearing is fixed to the motor shaft by riveting or gluing.

[0012] Furthermore, the inner ring of the second bearing is fixed to the motor shaft by riveting or gluing.

[0013] Furthermore, the first shell and the second shell are two independent injection molded parts.

[0014] As described above, the electric toothbrush motor according to the present invention has the following beneficial effects:

[0015] In the present application, after the first bearing and the second bearing are installed, the first housing and the second housing are clamped and connected in the front-to-back direction by relying on the fastening force between the inner ring of the first bearing and the motor shaft, and the fastening force between the inner ring of the second bearing and the motor shaft, so that the first bearing and the second bearing are assembled from the outside of the housing, and the first housing and the second housing are clamped, thereby achieving product packaging. In addition, when assembling the motor shaft and the first housing, and the motor shaft and the second housing, it is only necessary to knock in the first bearing from the outside of the first housing, and knock in the second bearing from the outside of the second housing, so that the product packaging is achieved and the bearings are installed in one riveting operation, which saves installation procedures and improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the motor used in the electric toothbrush in this application.

[0017] Figure 2 for Figure 1 Top view of the .

[0018] Figure 3 for Figure 2 AA section view.

[0019] Figures 4 to 6 This is a schematic diagram of the structure of the electric toothbrush motor in this application without the outer shell.

[0020] Figure 7 It is a schematic diagram of the structure of the prefabricated component composed of the intermediate shell, the iron core magnetic conductor and the coil winding in the present application.

[0021] Figure 8 It is a schematic diagram of the structure after the first shell and the core body are assembled in this application.

[0022] Fig. 9 It is a schematic diagram of the structure of the second shell in this application.

[0023] Component number description

[0024] 10. Housing

[0025] 11. First Shell

[0026] 111 First installation slot

[0027] 112 First connection slot

[0028] 113 Installation card slot

[0029] 114 Shell end

[0030] 115 Shell body

[0031] 116 second plug-in protrusion

[0032] 12 Second shell

[0033] 121 Second installation slot

[0034] 122 Second connection slot

[0035] 13 Intermediate housing

[0036] 131 first plug-in protrusion

[0037] 20 stator core

[0038] 21 Core body

[0039] 211 Arc segment

[0040] 212 Horizontal segment

[0041] 213 vertical segment

[0042] 22 Iron core magnetic conductor

[0043] 221 Coil winding unit

[0044] 222 Bending Department

[0045] 30 Coil winding

[0046] 40 Motor shaft

[0047] 50 Permanent magnet components

[0048] 51 permanent magnet

[0049] 60 First bearing

[0050] 70 Second bearing

[0051] 80 Flexible parts DETAILED DESCRIPTION

[0052] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0053] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0054] The present application provides a motor for an electric toothbrush with low heat generation and high efficiency, which is used in an electric toothbrush. Figures 1 to 3 As shown, the electric toothbrush motor involved in the present application includes a housing 10, a stator core 20, a coil winding 30, a motor shaft 40, and a permanent magnet component 50; wherein the stator core 20 and the coil winding 30 are both fixed to the housing 10; the motor shaft 40 is rotatably supported in the housing 10 through a bearing, and the motor shaft 40 is made of a magnetic conductive material; the permanent magnet component 50 is located at the periphery of the motor shaft 40. For the convenience of description, in this embodiment, the axial direction of the motor shaft 40 is defined as the front-to-back direction.

[0055] Furthermore, if Figures 1 to 3 As shown, the housing 10 includes a first housing 11 and a second housing 12 arranged front and back relative to each other along the axial direction of the motor shaft 40, and an intermediate housing 13 distributed between the first housing 11 and the second housing 12. The first housing 11 and the second housing 12 are fixedly connected, and the front and rear ends of the intermediate housing 13 are fixedly connected to the first housing 11 and the second housing 12 respectively. Preferably, as Figure 1 and Figure 8As shown, the first shell 11 includes a shell end 114 and a shell body 115 extending straight backward from the lower rear end of the shell end 114. The shell body 115 of the first shell 11 extends to the front end surface of the second shell 12, and the two are plug-connected. The shell body 115 includes a bottom located on the lower side of the motor shaft 40, and side portions located on the left and right sides of the motor shaft 40. An installation space is formed between the shell end 114 of the first shell 11 and the second shell 12, and the installation space is located on the upper side of the motor shaft 40. The intermediate shell 13 is accommodated in the installation space. The front end of the intermediate shell 13 is plug-connected to the shell end 114 of the first shell 11, and the rear end of the intermediate shell 13 is plug-connected to the second shell 12.

[0056] Furthermore, if Figure 3As shown, there are two bearings for rotatably supporting the motor shaft 40 in the housing 10, which are a first bearing 60 and a second bearing 70 arranged front to back. The motor shaft 40 is rotatably supported in the first housing 11 through the first bearing 60, and the motor shaft 40 is rotatably supported in the second housing 12 through the second bearing 70. In particular, a first mounting groove 111 is provided at the outer end of the shell end 114 of the first shell 11 facing away from the second shell 12, and the outer end of the first mounting groove 111 penetrates the first shell 11 forward, the first bearing 60 is accommodated in the first mounting groove 111, and the inner ring of the first bearing 60 is fixedly connected to the motor shaft 40, and the bottom of the inner end of the first mounting groove 111 stops the first bearing 60; a second mounting groove 121 is provided at the outer end of the second shell 12 facing away from the first shell 11, and the outer end of the second mounting groove 121 penetrates the second shell 12 backward, the second bearing 70 is accommodated in the second mounting groove 121, and the inner ring of the second bearing 70 is fixedly connected to the motor shaft 40, and the bottom of the inner end of the second mounting groove 121 stops the second bearing 70. When assembling the motor shaft 40 and the first housing 11, the motor shaft 40 is inserted into the inner hole of the first housing 11, and the first bearing 60 is knocked backward from the front end of the motor shaft 40 into the first mounting groove 111 of the first housing 11 until the first bearing 60 abuts against the bottom of the first mounting groove 111, and the first bearing 60 presses the first housing 11 inward. Similarly, when assembling the motor shaft 40 and the second housing 12, the motor shaft 40 is inserted into the inner hole of the second housing 12, and the second bearing 70 is knocked forward from the rear end of the motor shaft 40 into the second mounting groove 121 of the second housing 12 until the second bearing 70 abuts against the bottom of the second mounting groove 121, and the second bearing 70 presses the second housing 12 inward. In this way, after the first bearing 60 and the second bearing 70 are installed, the first housing 11 and the second housing 12 are clamped and connected in the front-to-back direction by the fastening force between the inner ring of the first bearing 60 and the motor shaft 40, and the fastening force between the inner ring of the second bearing 70 and the motor shaft 40, so that the first bearing 60 and the second bearing 70 are assembled from the outside of the housing, and the first housing 11 and the second housing 12 are clamped, thereby achieving the packaging of the product. In addition, when assembling the motor shaft 40 and the first housing 11, and the motor shaft 40 and the second housing 12, it is only necessary to knock in the first bearing 60 from the outside of the first housing 11, and knock in the second bearing 70 from the outside of the second housing 12, so that the product packaging is achieved and the bearings are installed in one riveting, saving the installation process and improving the assembly efficiency.

[0057] Preferably, the inner ring of the first bearing 60 is fixed by riveting or gluing to the motor shaft 40, and the inner ring of the second bearing 70 is fixed by riveting or gluing to the motor shaft 40. The first housing 11, the second housing 12 and the intermediate housing 13 are all made of plastic, and the first housing 11, the second housing 12 and the intermediate housing 13 are all injection molded parts and are also one-piece molded parts, which is conducive to reducing costs and facilitating assembly.

[0058] Furthermore, if Figure 3 As shown, an elastic flexible member 80 is provided between the inner end of the first bearing 60 and the first housing 11, and the flexible member 80 at this location is appropriately compressed to generate a forward force; or, an elastic flexible member 80 is provided between the inner end of the second bearing 70 and the second housing 12, and the flexible member 80 at this location is appropriately compressed to generate a backward force; or, an elastic flexible member 80 is provided between the inner end of the first bearing 60 and the first housing 11, and between the inner end of the second bearing 70 and the second housing 12. The flexible member 80 is a silicone ring or a gasket made of other elastic materials, which realizes flexible support at the first bearing 60 and the second bearing 70. In this way, when the outer ring of the first bearing 60 and / or the second bearing 70 is subjected to staggered force in the front-to-back direction Z, the flexible member 80 can eliminate the Z-direction clearance of the first bearing 60 and / or the second bearing 70, thereby eliminating the operating noise of the first bearing 60 and / or the second bearing 70. In addition, when the motor shaft 40 is subjected to Z-direction impact force during falling, the flexible member 80 can buffer the impact force and play a certain protective role.

[0059] Furthermore, if Figures 4 to 6 As shown, the stator core 20 includes a core body 21 distributed on the periphery of the permanent magnet component 50 and matched with the permanent magnet component 50, and a core magnetizer 22 magnetically conductively matched with each core body 21. The core body 21 is fixed to the first shell 11, and the core magnetizer 22 and the coil winding 30 are both fixed to the intermediate shell 13. Figures 4 to 6 In the view shown, a pair of permanent magnet components 50 are configured; accordingly, a pair of core bodies 21 in the stator core 20 are also configured, corresponding to the permanent magnet components 50. In addition, each permanent magnet component 50 is bipolar, with an N pole and an S pole; that is, each permanent magnet component 50 includes two permanent magnets 51 with different polarities, and the two permanent magnets 51 constituting each permanent magnet component 50 are closely arranged along the circumferential direction of the motor shaft 40 and extend along the axial direction of the motor shaft 40, so the permanent magnet 51 is a slender strip structure; there is a gap between the two connected permanent magnet components 50 in the circumferential direction of the motor shaft 40.

[0060] Furthermore, if Figures 4 to 6As shown, the core body 21 and the core magnet 22 of the stator core 20 are two independent components, that is, the stator core 20 is a split structure, but the core body 21 and the core magnet 22 constituting the stator core 20 are both integral structures. Among them, the core body 21 is Y-shaped, and the end face of the core body 21 facing the permanent magnet component 50 is an arc surface, or in other words, the section of the core body 21 close to the permanent magnet component 50 is an arc segment 211; the core body 21 includes, from the inside to the outside, the arc segment 211, the horizontal segment 212 extending horizontally in the left-right direction, and the vertical segment 213 extending vertically in the up-down direction. The core magnet 22 includes a coil winding portion 221 extending horizontally in the left-right direction, and the coil winding 30 is wound on the coil winding portion 221 of the core magnet 22, and the coil winding 30 extends straight left and right along the axial direction perpendicular to the motor shaft 40; in this way, as Figure 3 As shown, the length of the coil winding portion 221 in the axial direction of the motor shaft 40 directly determines the single-turn circumference and cross-sectional size of the coil winding 30 in its winding direction: the longer the length of the coil winding portion 221 in the axial direction of the motor shaft 40, the larger the single-turn circumference and cross-sectional size of the coil winding 30; the shorter the length of the coil winding portion 221 in the axial direction of the motor shaft 40, the smaller the single-turn circumference and cross-sectional size of the coil winding 30. In particular, in the present application, along the axial direction of the motor shaft 40, the length of the core body 21 is the same as the length of the permanent magnet component 50, the length of the coil winding portion 221 in the core magnetic conductor 22 is less than the length of the core body 21, and the ratio of the lengths of the two is less than 0.6.

[0061] When the electric toothbrush motor is working, an alternating current is passed through the coil winding 30, the core magnetizer 22 of the stator core 20 generates a magnetic circuit and transmits the magnetic circuit to the core body 21. The magnetic flux generated by the stator core 20 interacts with the permanent magnet 51 to convert electrical energy into mechanical energy. That is, under the joint action of the permanent magnet component 50, the stator core 20 and the coil winding 30, the motor shaft 40 is driven to swing. The brush head is fixed on the motor shaft 40, and the motor shaft 40 drives the brush head of the electric toothbrush to swing rapidly. During the working process, the stator core 20 has resistance heating: Q=I 2*R, the resistance R per turn of the stator core 20 is proportional to the single-turn circumference of the coil winding 30. After the stator core 20 is set as a split core body 21 and a core magnetizer 22 of different lengths, the coil winding portion 221 in the core magnetizer 22 for winding the coil winding 30 can be shortened, and does not need to be made as slender as the core body 21; and the length of the coil winding portion 221 directly determines the single-turn circumference and cross-sectional size of the coil winding 30. In addition, according to magnetic theory, when the total length of the magnetic path remains unchanged, the magnetomotive force generated by the coil winding 30 is proportional to the ampere-turns (NI), the magnetic resistance is inversely proportional to the cross-sectional area, and the magnetic flux generated by the coil winding 30 is equal to the magnetomotive force divided by the magnetic resistance. Thus, the present application shortens the coil winding portion 221 but keeps the cross section unchanged, thereby ensuring the same ampere-turns and magnetic resistance. Under the premise of providing the same magnetic flux, the circumference of a single turn of the coil winding 30 can be reduced, thereby reducing the resistance R per turn of the stator core 20, thereby effectively reducing the resistance heating of the stator core 20 under the premise of ensuring the same magnetic flux, that is, reducing the heating of the electric toothbrush motor, and ultimately improving the efficiency of the electric toothbrush motor. Furthermore, the present application only configures a single coil winding 30 on one side of the motor shaft 40, effectively reducing the cost under the premise of ensuring the performance advantages of the electric toothbrush motor, and at the same time, it is also conducive to reducing the size of the electric toothbrush motor.

[0062] Furthermore, the structure of magnetic conduction between the core body 21 and the core magnetic conductor 22 is as follows: Figures 3 to 6 As shown, the core magnetic conductor 22 also includes a bending portion 222 integrally extending from the left and right ends of the coil winding portion 221 toward the direction close to the core body 21, and the bending portion 222 extends from one end of the coil winding portion 221 to the vertical section 213 of the core body 21, and contacts or gaps with the vertical section 213 of the core body 21, thereby achieving magnetic conduction between the core magnetic conductor 22 and the two core bodies 21. Of course, in other embodiments, a bending portion extending to the coil winding portion 221 and contacting or gaps with the coil winding portion 221 may also be provided on the core body 21.

[0063] Preferably, if Figures 4 to 6 As shown, along the axial direction of the motor shaft 40, the length of the coil winding portion 221 in the core magnet 22 is the same as the length of the bent portion 222, that is, the core magnet 22 as a whole has the same length in the front-to-back direction; the length of the arc segment 211, the length of the horizontal segment 212 and the length of the vertical segment 213 in the core body 21 are the same, that is, the core body 21 as a whole has the same length in the front-to-back direction. In addition, along the axial direction of the motor shaft 40, the core magnet 22 is distributed in the middle position of the core body 21, then the front end of the core body 21 is located at the front side of the core magnet 22, and the rear end of the core body 21 is located at the rear side of the core magnet 22.

[0064] Furthermore, the iron core magnetizer 22 and the intermediate housing 13 can be fixed in two ways: 1. gluing and fixing after they are processed separately; 2. directly fixing by glue during the injection molding process of the intermediate housing 13, that is, the intermediate housing 13 is directly fixed to the outer periphery of the bent portion 222 in the iron core magnetizer 22 by injection molding. Figure 7 As shown, the intermediate shell 13, the iron core magnetic conductor 22 and the coil winding 30 are fixed as an independent prefabricated component, which is assembled in the installation space formed by the first shell 11 and the second shell 12 and located on the upper side of the motor shaft 40, so as to facilitate the winding of the coil winding 30 and the processing, assembly and maintenance of the electric toothbrush motor; when assembling the electric toothbrush motor, the intermediate shell 13 in the prefabricated component can be directly fixedly connected to the first shell 11 and the second shell 12 respectively.

[0065] Preferably, specifically, Figures 7 to 9 As shown, the front and rear ends of the intermediate shell 13 are provided with a first plug-in protrusion 131 that protrudes outward along the axis of the motor shaft 40, and the rear end surface of the shell end 114 of the first shell 11 and the front end surface of the second shell 12 are provided with a first connecting groove 112; the first plug-in protrusion 131 at the front end of the intermediate shell 13 is tightly inserted into the first connecting groove 112 of the shell end 114 of the first shell 11 to fix the preform to the first shell 11; the first plug-in protrusion 131 at the rear end of the intermediate shell 13 is tightly inserted into the first connecting groove 112 of the second shell 12 to fix the preform to the second shell 12. A second plug-in protrusion 116 that protrudes backward and outward is provided on the rear end surface of the shell body 115 of the first shell 11, and a second connecting groove 122 is provided on the front end surface of the second shell 12. The second plug-in protrusion 116 on the first shell 11 is tightly inserted into the second connecting groove 122 of the second shell 12 to fix the first shell 11 and the second shell 12. As shown Figure 8 As shown, a mounting slot 113 is opened in the side of the shell body 115 of the first shell 11, and the cross-sectional shape of the mounting slot 113 is adapted to the cross-sectional shape of the core body 21. The mounting slot 113 passes through the side of the shell body 115 backward, and the core body 21 is inserted into the mounting slot 113 from the rear end of the shell body 115, so that the core body 21 is fixed in the shell body 115.

[0066] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A double-bearing packaged electric toothbrush motor, comprising a housing (10), and a motor shaft (40) rotatably supported in the housing (10) by a first bearing (60) and a second bearing (70), wherein the first bearing (60) and the second bearing (70) are arranged side by side along the axial direction of the motor shaft (40), characterized in that: The housing (10) comprises a first shell (11) and a second shell (12) which are arranged axially opposite to each other along the motor shaft (40); the motor shaft (40) is rotatably supported in the first shell (11) via a first bearing (60); the motor shaft (40) is rotatably supported in the second shell (12) via a second bearing (70); the first shell (11) and the second shell (12) are two independent injection molded parts; the first shell (11) comprises a shell end (114) and a shell body (115) extending straightly backward from the rear end of the lower side of the shell end (114); the shell body (115) of the first shell (11) extends to the front end surface of the second shell (12), and the two are plug-connected; A first mounting groove (111) is formed at an outer end of the first housing (11) facing away from the second housing (12); the outer end of the first mounting groove (111) penetrates the first housing (11) outwardly; the first bearing (60) is accommodated in the first mounting groove (111), and the inner ring of the first bearing (60) is fixedly connected to the motor shaft (40); and the bottom of the inner end of the first mounting groove (111) stops the first bearing (60); A second mounting groove (121) is formed at the outer end of the second housing (12) facing away from the first housing (11); the outer end of the second mounting groove (121) penetrates the second housing (12) outwardly; the second bearing (70) is accommodated in the second mounting groove (121); the inner ring of the second bearing (70) is fixedly connected to the motor shaft (40); and the bottom of the inner end of the second mounting groove (121) stops the second bearing (70); When assembling the motor shaft (40) and the first housing (11), the motor shaft (40) is inserted into the inner hole of the first housing (11), and the first bearing (60) is knocked backward from the front end of the motor shaft (40) into the first mounting groove (111) of the first housing (11) until the first bearing (60) abuts against the bottom of the first mounting groove (111), and the first bearing (60) presses the first housing (11) inward; when assembling the motor shaft (40) and the second housing (12), the motor shaft (40) is inserted into the inner hole of the second housing (12), and the second bearing (70) is knocked forward from the rear end of the motor shaft (40) into the second mounting groove (121) of the second housing (12) until the second bearing (70) abuts against the bottom of the second mounting groove (121), and the second bearing (70) presses the second housing (12) inward; After the first bearing (60) and the second bearing (70) are installed, the first housing (11) is pressed inwardly by the first bearing (60) and the second housing (12) is pressed inwardly by the second bearing (70), and the first housing (11) and the second housing (12) are clamped and connected, so that the first bearing (60) and the second bearing (70) are assembled from the outside of the housing and the first housing (11) and the second housing (12) are clamped.

2. The electric toothbrush motor according to claim 1, characterized in that: An elastic flexible member (80) is provided between the inner end of the first bearing (60) and the first housing (11), and / or between the inner end of the second bearing (70) and the second housing (12).

3. The motor for an electric toothbrush according to claim 2, characterized in that: The flexible member (80) is a silicone ring.

4. The electric toothbrush motor according to claim 1, characterized in that: The inner ring of the first bearing (60) is fixed to the motor shaft (40) by riveting or gluing.

5. The electric toothbrush motor according to claim 1, characterized in that: The inner ring of the second bearing (70) is fixed to the motor shaft (40) by riveting or gluing.

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