Acoustic wave electric toothbrush driving device

Abstract

The utility model discloses a sound wave electric toothbrush driving device which comprises a permanent magnet, an electromagnet, an elastic piece and a driving shaft, the driving shaft is installed on a toothbrush shell through the elastic piece so that the driving shaft can swing relative to the toothbrush shell, and the driving shaft is provided with a flat part. The permanent magnet is directly fixed on the elastic sheet or the flat part through bonding or embedding, and the electromagnet is used for generating magnetic force to act on the permanent magnet so as to drive the driving shaft to swing back and forth. Compared with the prior art, installation steps can be reduced, the assembling efficiency can be improved, meanwhile, parts are reduced, and the manufacturing cost can also be reduced.

Description

Technical Field

[0001] The utility model relates to a driving device for a sonic electric toothbrush. Background Art

[0002] The drive motor of a sonic electric toothbrush is composed of an electromagnet, a permanent magnet, and a reset device (commonly including a shrapnel, a torsion spring, and a permanent magnet arranged in opposite directions to generate a reset function). Typical structures include an up-and-down type (for example, the solution disclosed in patent document CN101297775A), an inside-outside type with the rotor being an electromagnet (for example, the solution disclosed in patent document CN205212674U), and an inside-outside type with the rotor being a permanent magnet (for example, the solutions disclosed in patent documents CN210142929U and CN209389807U). In the above inside-outside type solutions with the rotor being a permanent magnet, the permanent magnet is installed and connected to the drive shaft through a separately designed permanent magnet bracket. In such a structure, there are many installation steps, which are time-consuming, and it is necessary to design the permanent magnet bracket, increasing the production cost. The present invention is an improvement on the inside-outside type sonic motor with the rotor being a permanent magnet.

[0003] For all drive motors of sonic electric toothbrushes with a permanent magnet as the inner rotor in the market, a rod-shaped drive shaft and small-sized shrapnel are used, so a plastic bracket must be used as a transition connecting component for the shrapnel, drive shaft, and permanent magnet. Summary of the Invention

[0004] The purpose of the present utility model is to provide a driving device for a sonic electric toothbrush to solve the problems raised in the above background art. To achieve the above purpose, the present utility model provides the following technical solutions:

[0005] A driving device for a sonic electric toothbrush includes a permanent magnet, an electromagnet, a shrapnel, and a drive shaft. The drive shaft is installed on the toothbrush housing through the shrapnel so that the drive shaft can swing relative to the toothbrush housing. The drive shaft is provided with a flat portion. The permanent magnet is directly fixed on the shrapnel or the flat portion by bonding or inlaying. The electromagnet is used to generate a magnetic force acting on the permanent magnet to drive the drive shaft to swing back and forth.

[0006] Further, there are two or more sets of coils of the electromagnet wound around the magnetic core in segments and energized with alternating currents of different frequencies.

[0007] Further, the shrapnel is in a "day" shape. The two side edges of the shrapnel are used to install the electromagnet, and the drive shaft is installed in the middle portion of the shrapnel.

[0008] Further, the shrapnel is in an "I" shape. The two end edges of the shrapnel are used to install the electromagnet, and the drive shaft is installed in the middle portion of the shrapnel.

[0009] Further, the electromagnet is connected to the elastic piece by spot welding or laser welding.

[0010] Advantageous effects: Compared with the prior art, the present invention can reduce the installation steps, speed up the assembly efficiency, and at the same time, with fewer components, the manufacturing cost can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 It is an exploded view of the driving device of the present utility model;

[0013] Figure 2 It is an assembly drawing of the driving device of the present utility model;

[0014] Figure 3 It is another assembly drawing of the driving device of the present utility model;

[0015] Figure 4 It is another structural diagram of the elastic piece of the present utility model;

[0016] Figure 5 It is yet another structural diagram of the elastic piece of the present utility model.

[0017] It should be noted that the drawings are not necessarily drawn to scale, but are only shown in a schematic manner that does not affect the understanding of the reader. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0019] In the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0020] Moreover, in addition to being used to indicate orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

[0021] In addition, the terms "installed", "set", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components, or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components, or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0023] 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 "a", "an", and "the" are intended to include the plural forms.

[0024] It should be further understood that the term "and / or" 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 associated listed items, and includes these combinations.

[0025] As Figures 1 to 2 shown, the present utility model provides a driving device for a sonic electric toothbrush, which includes a permanent magnet 1, an electromagnet 2, a drive shaft 3, and a shrapnel 4. The drive shaft 3 is installed on the toothbrush housing through the shrapnel 4, and the drive shaft 3 and the shrapnel 4 are connected by bonding or welding so that the drive shaft 3 can swing relative to the toothbrush housing. The drive shaft 3 is provided with a flat portion 31, and the permanent magnet 1 is directly fixed on the flat portion 31 by bonding or embedding. The electromagnet 2 is used to generate a magnetic force acting on the permanent magnet 1 to drive the drive shaft 3 to swing back and forth.

[0026] As an example, a driving device for a sonic electric toothbrush includes a permanent magnet 1 and an electromagnet 2. The electromagnet 2 is used to generate a magnetic force acting on the permanent magnet 1. The driving shaft 3 is provided with a flat portion 31. The permanent magnet 1 is directly fixed on the elastic piece 4 or the flat portion 31 by bonding or inlaying. In this case, after the permanent magnet 1 receives the magnetic force, it is transmitted to the driving shaft 3 through the flat portion 31. In the prior art, the driving shaft 3 is cylindrical, and a permanent magnet plastic bracket is required to fix the permanent magnet 1 on the driving shaft 3 during installation. Therefore, compared with the prior art, the present invention can reduce the installation steps, improve the assembly efficiency, and at the same time reduce the number of components and the manufacturing cost. The driving shaft 3 is installed in the toothbrush housing through the elastic piece 4. Since the elastic piece 4 can be elastically deformed, a flexible connection between the toothbrush housing and the driving shaft 3 is achieved. Therefore, the driving shaft 3 can swing relative to the toothbrush housing to drive the toothbrush head to move. In another embodiment, the permanent magnet 1 can be directly fixed on the elastic piece 4 by bonding or inlaying, that is, the permanent magnet 1 is directly bonded to the side of the elastic piece opposite to the driving shaft.

[0027] In one embodiment, the flat portion 31 is provided with an avoidance convex portion 311. There is a gap between the avoidance convex portion 311 and the elastic piece 4, so that the driving shaft 3 does not contact the end face of the elastic piece 4, so as to avoid interference with the end face of the elastic piece 4 during swinging. In another embodiment, the flat portion 31 has no concave surface, and the permanent magnet 1 is directly bonded to the flat portion 31.

[0028] In one embodiment, the electromagnet core is semi-surrounding. In another embodiment, the electromagnet core is fully surrounding. The driving shaft 3 is made of a magnetically conductive metal.

[0029] In one embodiment, the elastic piece 4 is in the shape of a "day" character. The two side edges of the elastic piece 4 are used to install the electromagnet 2. The driving shaft 3 is installed in the middle part of the elastic piece 4. The electromagnet 2 is connected to the two sides of the elastic piece 4 by spot welding or laser welding. Specifically, the middle part of the elastic piece 4 includes a bracket installation part.

[0030] In another embodiment, the elastic piece 4 can also be made in the shape of a "worker" character (see Figure 4 ), the two end edges of the elastic piece are used to install the electromagnet, and the flat portion 31 is installed in the middle part of the elastic piece.

[0031] In another embodiment, the elastic piece 4 can also be made in an inverted "T" shape. The flat portion 31 is fixed to the middle part of the elastic piece by welding (see Figure 5 ). Preferably, the width of the permanent magnet 1 is greater than or equal to the width of the flat portion 31, and the width of the permanent magnet 1 is greater than or equal to the width of the elastic piece 4.

[0032] In another embodiment, the electromagnet 2 has two or more coil segments wound around the magnetic core (see Figure 3), an alternating current with different frequencies is passed through to form a sweeping and vibrating sonic electric toothbrush (this is the prior art and will not be described repeatedly here).

[0033] As described above, it is only the preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. The protection scope of the present invention should be subject to the protection scope of the claims. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art, without departing from the technical solution scope of the present invention, may make some changes or modifications to the equivalent embodiments of equivalent changes by using the disclosed technical content above. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A sonic electric toothbrush driving device, characterized in that: It includes a permanent magnet, an electromagnet, a leaf spring, and a drive shaft. The drive shaft is mounted on the toothbrush housing through the leaf spring so that the drive shaft can swing relative to the toothbrush housing. The drive shaft is provided with a flat portion. The permanent magnet is directly fixed on the leaf spring or the flat portion by bonding or inlaying. The electromagnet is used to generate a magnetic force acting on the permanent magnet to drive the drive shaft to swing back and forth.

2. The sonic electric toothbrush driving device according to claim 1, characterized in that: There are more than two groups of coils of the electromagnet wound around the magnetic core and supplied with alternating current of different frequencies.

3. The sonic electric toothbrush driving device according to claim 1, characterized in that: The leaf spring is in the shape of a Chinese character 'Ri'. The two side edges of the leaf spring are used to mount the electromagnet, and the drive shaft is mounted in the middle part of the leaf spring.

4. The sonic electric toothbrush driving device according to claim 1, characterized in that: The leaf spring is in the shape of a Chinese character 'Gong'. The two end edges of the leaf spring are used to mount the electromagnet, and the drive shaft is mounted in the middle part of the leaf spring.

5. A sonic electric toothbrush driving device according to claim 3 or 4, characterized in that: The electromagnet is connected to the leaf spring by spot welding or laser welding.

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