Driving mechanism of electric toothbrush

Abstract

The utility model discloses a driving mechanism of an electric toothbrush, which comprises a driving shaft, a permanent magnet, a bearing, a U-shaped iron core and a coil, the permanent magnet is mounted on the driving shaft, the coil is wound on the U-shaped iron core, the bearing is sleeved on the driving shaft, the bearing is fixed on the inner side of the U-shaped iron core, and the coil is fixed on the inner side of the U-shaped iron core. And the coil is electrified to generate magnetic force which acts on the permanent magnet through the U-shaped iron core so as to drive the driving shaft to swing. The bearing is fixed on the inner side of the U-shaped iron core in an interference fastening, clamping, welding or sticking manner, so that the precision of an assembly gap between the bearing and the iron core can be ensured, and the problem of shaking is solved.

Description

Technical Field

[0001] The utility model relates to a driving mechanism of an electric toothbrush. Background Art

[0002] In existing electric toothbrushes, the bearings for mounting the drive shaft are usually fixed to the housing. In this case, the assembly gap accuracy between the drive shaft fixed to the bearings and the permanent magnet and the iron core is difficult to control, resulting in the drive shaft easily shaking when rotating. Summary of the Invention

[0003] The purpose of the present invention is to provide a driving mechanism for an electric toothbrush to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions:

[0004] A drive mechanism for an electric toothbrush includes a drive shaft, a permanent magnet, a bearing, a U-shaped iron core, and a coil. The permanent magnet is mounted on the drive shaft, the coil is wound around the U-shaped iron core, the bearing is sleeved on the drive shaft, and the bearing is fixed on the inner side of the U-shaped iron core. When the coil is energized, magnetic force is generated, which acts on the permanent magnet through the U-shaped iron core to drive the drive shaft to swing.

[0005] Furthermore, the bearing is fixed to the inner side of the U-shaped core by interference fastening, clamping, welding or bonding.

[0006] Furthermore, the coils are multiple and at least two coils are fed with alternating currents of different frequencies.

[0007] Furthermore, the permanent magnet is arranged inside the U-shaped iron core or at an end of the U-shaped iron core.

[0008] Furthermore, the permanent magnets are provided in two groups, one group is provided inside the U-shaped iron core, and the other group is provided at the end of the U-shaped iron core.

[0009] Furthermore, a flywheel is provided on the drive shaft.

[0010] Furthermore, the driving mechanism further includes a permanent magnet bracket, the permanent magnet bracket is sleeved on the driving shaft, and the permanent magnet is fixed on the permanent magnet bracket.

[0011] Furthermore, the contact surface between the inner side of the U-shaped iron core and the bearing is an arc surface.

[0012] Beneficial effect: The bearing is fixed to the inner side of the U-shaped core by interference fastening, clamping or gluing, which can ensure the assembly gap accuracy between the bearing and the core and solve the problem of jitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a diagram of the driving mechanism of the electric toothbrush of the present utility model;

[0015] Figure 2 It is an exploded view of the driving mechanism of the electric toothbrush of the present invention.

[0016] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] In this utility model, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the utility model and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0019] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0020] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0021] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0022] It should also be understood that the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0023] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0024] like Figures 1 to 2 As shown, this embodiment provides a driving mechanism of an electric toothbrush, including a driving shaft 1, a permanent magnet 2, a bearing 3, a U-shaped iron core 4, and a coil 5. The permanent magnet 2 is mounted on the driving shaft 1, the coil 5 is wound around the U-shaped iron core 4, the bearing 3 is sleeved on the driving shaft 1, and the bearing 3 is fixed to the inner side of the U-shaped iron core 4 by interference fastening, clamping, welding or bonding. The coil 5 is energized to generate magnetic force, which acts on the permanent magnet 2 through the U-shaped iron core 4 to drive the driving shaft 1 to swing.

[0025] The bearing 3 is fixed to the inner side of the U-shaped core 4 by interference fastening, clamping or gluing, which can ensure the assembly gap accuracy between the bearing 3 and the core and solve the problem of shaking.

[0026] As a further solution of the present invention, there are multiple coils 5 and at least two coils 5 are fed with alternating currents of different frequencies.

[0027] As a further solution of the present invention: the permanent magnet 2 is arranged on the inner side of the U-shaped iron core 4 or on the end of the U-shaped iron core 4. Of course, two groups of permanent magnets can also be arranged here, one group is arranged on the inner side of the U-shaped iron core, and the other group is arranged on the end of the U-shaped iron core.

[0028] As a further solution of the present invention: a flywheel 6 is provided on the driving shaft 1 to play a role in stabilization and balance.

[0029] As a further solution of the present invention: the driving mechanism further includes a permanent magnet bracket 7 , the permanent magnet bracket 7 is sleeved on the driving shaft 1 , and the permanent magnet 2 is fixed on the permanent magnet bracket 7 .

[0030] As a further solution of the present invention, the inner side of the U-shaped core 4 and the contact surface with the bearing 3 are arc-shaped. The inner side arc-shaped surface of the U-shaped core 4 is made by turning or milling.

[0031] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. The scope of protection of the present invention shall be subject to the scope of protection of the claims. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the present invention, make some changes or modifications to the above disclosed technical contents into equivalent embodiments. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention are still within the scope of the present invention.

Claims

1. A driving mechanism for an electric toothbrush, characterized in that: It includes a drive shaft, a permanent magnet, a bearing, a U-shaped iron core, and a coil. The permanent magnet is installed on the drive shaft, the coil is wound on the U-shaped iron core, the bearing is sleeved on the drive shaft, and the bearing is fixed on the inner side of the U-shaped iron core. When the coil is energized, magnetic force is generated, which acts on the permanent magnet through the U-shaped iron core to drive the drive shaft to swing.

2. The driving mechanism of an electric toothbrush according to claim 1, characterized in that: The bearing is fixed to the inner side of the U-shaped iron core by interference fastening, clamping, welding or bonding.

3. The driving mechanism of an electric toothbrush according to claim 1, characterized in that: There are a plurality of coils, and alternating currents of different frequencies are supplied to at least two of the coils.

4. The driving mechanism of an electric toothbrush according to claim 1, characterized in that: The permanent magnet is arranged inside the U-shaped iron core or at an end of the U-shaped iron core.

5. The driving mechanism of an electric toothbrush according to claim 1, characterized in that: The permanent magnets are provided in two groups, one group is provided inside the U-shaped iron core, and the other group is provided at the end of the U-shaped iron core.

6. The driving mechanism of an electric toothbrush according to claim 1, characterized in that: A flywheel is provided on the driving shaft.

7. The driving mechanism of an electric toothbrush according to claim 1, characterized in that: The driving mechanism further includes a permanent magnet bracket, which is sleeved on the driving shaft and on which the permanent magnet is fixed.

8. The driving mechanism of an electric toothbrush according to claim 1, characterized in that: The inner side of the U-shaped iron core and the contact surface with the bearing are arc surfaces.

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