Vibration motor and electric toothbrush

Abstract

The utility model discloses a vibration motor and an electric toothbrush, which comprise a shell, a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are arranged in the shell, and one end of the rotor assembly extends out of the shell; the stator assembly comprises a first plastic shell, a second plastic shell and magnets; the magnets are respectively mounted on the side surfaces, close to the rotor assembly, of the first plastic shell and the second plastic shell; the first plastic shell and the second plastic shell are symmetrically arranged; the inner side surface of the shell is provided with a first convex plate between the first plastic shell and the second plastic shell, and the inner side surface of the shell is provided with a second convex plate at the tops of the first plastic shell and the second plastic shell; the first protruding plate abuts against and expands the side faces of the first plastic shell and the second plastic shell in a pre-tightening mode, and the second protruding plate abuts against the top of the first plastic shell and the top of the second plastic shell. And the magnets are fixed by adopting the plastic shell which is integrally formed by plastic and is lower in cost, so that an original structure adopting a stator core is reduced, and the cost of the motor product is reduced.

Description

Technical Field

[0001] The utility model relates to the field of electric toothbrush motors, in particular to a vibration motor and an electric toothbrush. Background Art

[0002] Sonic motors are commonly used in electric toothbrushes, including stators and rotors, and are directly positioned in the toothbrush handle. The stator core is made of multiple silicon steel sheets or silicon steel sheets stacked together, and the structure of the stator core is customized so that the stator core positions the magnet inward. For example, in the Chinese utility model patent with application number 2020216625348, the stator core of the motor needs to be customized, which is costly. Summary of the invention

[0003] The utility model provides a vibration motor and an electric toothbrush, aiming to solve the problem of high cost of the stator core in the existing sonic motor.

[0004] According to an embodiment of the present application, a vibration motor is provided, comprising a housing, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are arranged in the housing, and one end of the rotor assembly extends out of the housing; the stator assembly comprises a first plastic shell, a second plastic shell and a magnet, wherein the magnets are respectively mounted on the sides of the first plastic shell and the second plastic shell close to the rotor assembly; the first plastic shell and the second plastic shell are symmetrically arranged; the inner side surface of the housing is provided with a raised first convex plate between the first plastic shell and the second plastic shell, and the inner side surface of the housing is provided with a second convex plate at the top of the first plastic shell and the second plastic shell; the first convex plates respectively abut against and open the sides of the first plastic shell and the second plastic shell for pre-tightening, and the second convex plates respectively abut against the tops of the first plastic shell and the second plastic shell.

[0005] Preferably, the bottoms of the first plastic shell and the second plastic shell are fixed to the inner side surface of the outer shell by gluing.

[0006] Preferably, the rotor assembly comprises a rotating shaft, the first plastic shell and the second plastic shell are arranged around the outer circumference of the rotating shaft; one end of the rotating shaft extends out of the outer shell, and the rotating shaft is provided with a first bearing and a second bearing at opposite ends corresponding to the outer shell.

[0007] Preferably, the housing is provided with a bearing groove protruding outward at the position of the first bearing, and the first bearing is positioned in the bearing groove; the rotating shaft is positioned with a first limiting ring at the bottom of the first bearing, and the first limiting ring is supported on the side of the first bearing away from the bearing groove.

[0008] Preferably, the first bearing is a ball bearing or an oil-containing bearing.

[0009] Preferably, an installation cover is provided at one end of the outer shell extending away from the rotor assembly, and the installation cover is detachably inserted into the outer shell; an installation groove for positioning the second bearing is provided in the installation cover; a second limiting ring is positioned at the bottom of the second bearing on the rotating shaft, and the second limiting ring abuts against one side of the second bearing away from the installation groove.

[0010] Preferably, the second bearing is an oil-impregnated bearing.

[0011] Preferably, the installation cover is provided with an annular wall on the inner side corresponding to the outer shell, and the annular wall contacts the inner side of the outer shell; when the installation cover is inserted into the outer shell, the end of the annular wall abuts against the bottoms of the first plastic shell and the second plastic shell. Preferably, the first plastic shell and the second plastic shell are arranged around the outer peripheral side of the rotor assembly; the rotor assembly includes a rotating shaft, an iron core and a winding, the iron core is positioned on the rotating shaft, and the winding is wound around the outer peripheral side of the iron core.

[0012] The present utility model also provides an electric toothbrush, including the vibration motor described in any one of the above.

[0013] Compared with the prior art, the vibration motor and the electric toothbrush provided by the present utility model have the following beneficial effects:

[0014] 1. By using the first plastic shell and the second plastic shell to fix the magnet, and combining the first convex plate and the second convex plate protruding from the inner side of the outer shell to form a complete fixation of the first plastic shell and the second plastic shell, the plastic shell formed by plastic one-piece molding with lower cost is used to fix the magnet, reducing the original structure using a stator iron core and reducing the cost of the motor product of the present application. At the same time, the first convex plate and the second convex plate adopt an integrally formed structure with the deformation of the outer shell side wall, and no additional fixing parts are required, further reducing the product cost.

[0015] 2. The first bearing and the second bearing adopt oil-impregnated bearings, which have lower cost compared with traditional ball bearings, reducing the production cost of the motor of the present application. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is a schematic structural diagram of a vibration motor provided by the first embodiment of the present utility model.

[0018] Figure 2 is an exploded structural diagram of a vibration motor provided by the first embodiment of the present utility model.

[0019] Figure 3 is a schematic cross-sectional structure diagram of the vibration motor provided by the first embodiment of the present utility model in the top direction.

[0020] Figure 4 is a schematic cross-sectional structure diagram of the vibration motor provided by the first embodiment of the present utility model in the side direction of the housing.

[0021] Reference numeral description:

[0022] 1. Housing; 11. First convex plate; 12. Second convex plate; 13. Bearing groove; 14. Mounting cover; 141. Mounting groove; 142. Ring wall;

[0023] 2. Stator assembly; 21. First plastic shell; 22. Second plastic shell; 23. Magnet;

[0024] 3. Rotor assembly; 31. Rotating shaft; 32. Iron core; 33. Winding;

[0025] 101. First bearing; 102. Second bearing; 201. First limiting ring; 202. Second limiting ring. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] It should also be understood that the terms used in the specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. As used in the specification of the present utility model and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include the plural forms.

[0028] It should be further understood that the term " / and / " used in the specification of the present utility model and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0029] Please refer to Figure 1 , Figure 2 and Figure 3The first embodiment of the utility model discloses a vibration motor, including a housing 1, a stator assembly 2 and a rotor assembly 3, wherein the stator assembly 2 and the rotor assembly 3 are arranged in the housing 1, and one end of the rotor assembly 3 extends out of the housing 1, and the rotor assembly 3 is used to pass through the housing 1 and output a rotating shaft outward.

[0030] The stator assembly 2 includes a first plastic shell 21, a second plastic shell 22 and a magnet 23, and the magnet 23 is respectively installed on the side of the first plastic shell 21 and the second plastic shell 22 close to the rotor assembly 3. The first plastic shell 21 and the second plastic shell 22 are symmetrically arranged, and the first plastic shell 21 and the second plastic shell 22 are arranged around the outer circumference of the rotor assembly 3.

[0031] The inner side of the housing 1 is provided with a raised first convex plate 11 between the first plastic shell 21 and the second plastic shell 22, and the inner side of the housing 1 is provided with a second convex plate 12 at the top of the first plastic shell 21 and the second plastic shell 22. The first convex plate 11 and the second convex plate 12 are inwardly protruding structures of the side wall of the housing 1.

[0032] The first convex plate 11 is respectively pressed against and stretched to pre-tighten the side surfaces of the first plastic shell 21 and the second plastic shell 22, so that the backs of the first plastic shell 21 and the second plastic shell 22 are pressed against and pre-tightened on the inner side surface of the outer shell 1. The second convex plate 12 is respectively pressed against the top of the first plastic shell 21 and the second plastic shell 22, limiting the freedom of the first plastic shell 21 and the second plastic shell 22 in the axial direction of the outer shell 1 toward one end of the outer shell 1.

[0033] It can be understood that when installing the first plastic shell 21 and the second plastic shell 22, they can be inserted from the opposite direction of the second protruding plate 12 of the outer shell 1 until the first plastic shell 21 and the second plastic shell 22 are respectively abutted against the second protruding plate 12, and then the first plastic shell 21 and the second plastic shell 22 can be completely fixed by using a spot glue fixing method at the position of the bottom of the first plastic shell 21 and the second plastic shell 22 and the inner side of the outer shell 1.

[0034] Please continue to combine Figure 2 and Figure 3 The rotor assembly 3 includes a rotating shaft 31 , an iron core 32 and a winding 33 . The iron core 32 is positioned on the rotating shaft 31 . The rotating shaft 31 drives the iron core 32 to rotate. The winding 33 is wound around the outer circumference of the iron core 32 .

[0035] The first plastic shell 21 and the second plastic shell 22 are disposed around the outer circumference of the shaft 31. One end of the shaft 31 extends out of the housing 1, and the shaft 31 is provided with a first bearing 101 and a second bearing 102 at two opposite ends corresponding to the housing 1.

[0036] Please combine Figure 2 and Figure 4 such that the housing 1 is provided with a bearing groove 13 protruding outward at the position of the first bearing 101, and the first bearing 101 is positioned within the bearing groove 13. A first limiting ring 201 is positioned at the bottom of the first bearing 101 on the rotating shaft 31, and the first limiting ring 201 abuts against a side of the first bearing 101 away from the bearing groove 13. The first limiting ring 201 is connected to the rotating shaft 31 by interference fit, so that the bearing groove 13 and the first limiting ring 201 cooperate to stably position the first bearing 101 within the bearing groove 13.

[0037] One end of the housing 1 extending away from the rotor assembly 3 is provided with a mounting cover 14, and the mounting cover 14 is detachably inserted into the housing 1. An installation groove 141 for positioning the second bearing 102 is provided within the mounting cover 14. A second limiting ring 202 is positioned at the bottom of the second bearing 102 on the rotating shaft 31, and the second limiting ring 202 abuts against a side of the second bearing 102 away from the installation groove 141. The second limiting ring 202 is connected to the rotating shaft 31 by interference fit, so that the installation groove 141 and the second limiting ring 202 cooperate to stably position the second bearing 102 within the installation groove 141.

[0038] It can be understood that the first bearing 101 and the second bearing 102 can adopt ball bearings or oil-impregnated bearings. For example, when the first bearing 101 and the second bearing 102 adopt oil-impregnated bearings, the positioning of the two bearings is achieved by combining the first limiting ring 201 and the second limiting ring 202, without the need for bonding and fixing between the traditional bearing and the output shaft. In this embodiment, the first bearing 101 can adopt a ball bearing, and the second bearing 102 adopts an oil-impregnated bearing.

[0039] It can be understood that the oil-impregnated bearing, that is, the porous bearing (Porous Bearing), uses metal powder as the main raw material. When the rotating shaft 31 rotates, heat is generated by the friction between the two ends of the rotating shaft 31 and the first bearing 101 and the second bearing 102 respectively. Based on the characteristics of the oil-impregnated bearing, the first bearing 101 and the second bearing 102 secrete grease after thermal expansion, so that the rotating shaft 31 obtains good lubrication and mechanical loss is reduced.

[0040] It can be understood that when the first bearing 101 and the second bearing 102 adopt oil-impregnated bearings, they have a lower cost compared with traditional ball bearings, reducing the production cost of the motor in this application.

[0041] It can be understood that the first limiting ring 201 and the second limiting ring 202 adopt a ring structure. For example, a copper ring, an iron ring or a plastic ring can be used. In this embodiment, the first limiting ring 201 and the second limiting ring 202 adopt copper rings.

[0042] Please continue to combine Figure 2 with Figure 4 , the mounting cover 14 is provided with an annular wall 142 on the inner side corresponding to the outer shell 1. The annular wall 142 is inserted into the outer shell 1, and the annular wall 142 is in contact with the inner side of the outer shell 1.

[0043] Optionally, as an embodiment, when the mounting cover 14 is inserted into the outer shell 1, the end of the annular wall 142 abuts against the bottoms of the first plastic shell 21 and the second plastic shell 22. That is, in an optional embodiment, the bottoms of the first plastic shell 21 and the second plastic shell 22 can adopt a pre-tightening method of being inserted and held by the mounting cover 14, and there is no need for glue dotting fixation.

[0044] The second embodiment of the present invention further provides an electric toothbrush, which includes the vibration motor and the housing (not shown in the figure) of the above first embodiment. The vibration motor is placed in the housing, and the vibration motor is used to connect the toothbrush head of the electric toothbrush and drive the toothbrush head to rotate reciprocally.

[0045] Compared with the prior art, the vibration motor and the electric toothbrush provided by the present invention have the following beneficial effects:

[0046] 1. By using the first plastic shell and the second plastic shell to fix the magnet, and combining the first convex plate and the second convex plate protruding from the inner side of the outer shell to form a complete fixation of the first plastic shell and the second plastic shell, the plastic shell formed by plastic one-piece molding with lower cost is used to fix the magnet, reducing the original structure using the stator iron core, and reducing the cost of the motor product of this application. At the same time, the first convex plate and the second convex plate adopt an integrally formed structure of the side wall deformation of the outer shell, and no additional fixing parts are required, further reducing the product cost.

[0047] 2. The first bearing and the second bearing adopt oil-containing bearings, which have lower cost compared with traditional ball bearings, reducing the production cost of the motor of this application.

[0048] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A vibration motor, characterized in that: It comprises a housing, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are arranged in the housing, and one end of the rotor assembly extends out of the housing; The stator assembly includes a first plastic shell, a second plastic shell and a magnet, and the magnet is respectively installed on the side of the first plastic shell and the second plastic shell close to the rotor assembly; The first plastic shell and the second plastic shell are symmetrically arranged; The inner side surface of the outer shell is provided with a raised first convex plate between the first plastic shell and the second plastic shell, and the inner side surface of the outer shell is provided with a second convex plate on the top of the first plastic shell and the second plastic shell; The first convex plates respectively abut against and open the side surfaces of the first plastic shell and the second plastic shell to pre-tighten them, and the second convex plates respectively abut against the tops of the first plastic shell and the second plastic shell.

2. The vibrating motor according to claim 1, wherein: The bottoms of the first plastic shell and the second plastic shell are glued and fixed to the inner side surface of the outer shell.

3. The vibrating motor according to claim 1, wherein: The rotor assembly comprises a rotating shaft, and the first plastic shell and the second plastic shell are disposed around the outer circumference of the rotating shaft; One end of the rotating shaft extends out of the housing, and the rotating shaft is provided with a first bearing and a second bearing at two opposite ends corresponding to the housing.

4. The vibrating motor according to claim 3, characterized in that: The housing is provided with a bearing groove protruding outward at the position of the first bearing, and the first bearing is positioned in the bearing groove; The rotating shaft is provided with a first limiting ring at the bottom of the first bearing, and the first limiting ring abuts against a side of the first bearing away from the bearing groove.

5. The vibrating motor according to claim 4, wherein: The first bearing is a ball bearing or an oil-containing bearing.

6. The vibrating motor according to claim 3, wherein: An installation cover is provided at one end of the housing extending away from the rotor assembly, and the installation cover is detachably plugged into the housing; The mounting cover is provided with a mounting groove for positioning the second bearing; A second limiting ring is positioned on the bottom of the second bearing of the rotating shaft, and the second limiting ring abuts against a side of the second bearing away from the mounting groove.

7. The vibrating motor according to claim 6, characterized in that: The second bearing is an oil-containing bearing.

8. The vibrating motor according to claim 6, wherein: The mounting cover is provided with an annular wall on the inner side surface corresponding to the outer shell, and the annular wall is in contact with the inner side surface of the outer shell; When the installation cover is inserted into the outer shell, the end of the annular wall abuts against the bottom of the first plastic shell and the second plastic shell.

9. The vibrating motor according to claim 1, wherein: The first plastic shell and the second plastic shell are disposed around the outer circumference of the rotor assembly; The rotor assembly includes a rotating shaft, an iron core and a winding. The iron core is positioned on the rotating shaft, and the winding is wound around the outer circumference of the iron core.

10. An electric toothbrush, characterized in that: Comprising a vibration motor as claimed in any one of claims 1-9.

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