External winding type sound wave motor and electric toothbrush

Abstract

The utility model discloses an external winding type sound wave motor and electric toothbrush, including casing, support, iron core and bearing, casing is provided around the periphery side of support, iron core is located on support, the support is integrally formed, the support includes the bearing fixed part of both ends and the iron core fixed part of middle, the bearing is respectively provided in the bearing fixed part of both ends, and the iron core fixed part is located in the iron core fixed part of both ends. The iron core fixing part protrudes out of the side face of the support, the iron core is positioned in the iron core fixing part, and the coil is wound on the peripheral side of the iron core fixing part. The integrated plastic-molded support is arranged in the acoustic motor, and the bearings are positioned by the bearing fixing parts at the two ends of the support, so that the bearings at the two ends can be simultaneously fixed in the same part, the mounting error is reduced, the mounting precision of the motor is improved, and vibration and noise in the using process are reduced. And meanwhile, the coil is wound outside the iron core fixing part and the iron core is fixed inside the iron core fixing part in a manner that the outer side surface of the iron core fixing part protrudes, so that the coil can be wound outside and the iron core and the coil can be insulated and isolated synchronously.

Description

Technical Field

[0001] The utility model relates to the field of electric toothbrush motors, in particular to an outer-winding sonic motor and an electric toothbrush. Background Art

[0002] Sonic wave motors are commonly used in electric toothbrushes. They usually include a stator and a rotor. The direction of the magnetic field is constantly changed by the energized coil, so that the output shaft can rotate back and forth frequently. In common sonic wave motors, the rotor rotates inside, and the stator is arranged on the side of the rotor. The coil is wound on the stator, and the stator is arranged close to the rotor, which is a common inner winding. For example, the attached document of the Chinese utility model patent application number 2019208486707 shows that the stator is wound around the stator, and the stator is arranged close to the rotor. Figure 2 As shown, the inner winding will affect the efficiency of the product when assembled.

[0003] Secondly, as in the above-mentioned patent, the bearings at both ends of the rotating shaft are positioned on different parts, such as the front end bearing is positioned on the outer shell, and the rear end bearing is positioned on the end cover. This is also the common bearing fixing structure of most current sonic motors. The sonic motor used in electric toothbrushes is a high-frequency vibration motor. Installation and manufacturing errors will lead to problems such as excessive vibration and noise during use, affecting the user experience. Summary of the invention

[0004] The utility model provides an externally wound sonic motor and an electric toothbrush, aiming to solve the problems of low winding efficiency and large vibration of the existing sonic motor.

[0005] According to an embodiment of the present application, there is provided an externally wound sonic wave motor, comprising a shell, a bracket, an iron core and a bearing, wherein the shell is arranged on the outer peripheral side of the bracket, the iron core is positioned on the bracket, and the bearing is positioned at both ends of the bracket; the bracket is integrally formed, and the bracket comprises bearing fixing parts at both ends and an iron core fixing part in the middle, the bearings are arranged in the bearing fixing parts at both ends, the iron core fixing part protrudes from the side surface of the bracket, and a plurality of the iron core fixing parts are arranged on the side surface of the bracket at equal intervals, and the iron core is positioned in the iron core fixing part; the shell is connected to the iron core fixing part, and the iron core passes through the iron core fixing part and contacts the shell; the coil is wound on the outer peripheral side of the iron core fixing part.

[0006] Preferably, it further comprises a rotating shaft, the rotating shaft passes through two bearings in sequence, the rotating shaft is provided with a magnet group in the area between the two corresponding bearings, and the magnet group is positioned on the rotating shaft.

[0007] Preferably, the magnet group includes an N magnet and an S magnet of an arc-shaped structure, and the N magnet and the S magnet are arranged in half and positioned on the rotating shaft.

[0008] Preferably, a positioning sleeve is provided between the bearing and the magnet group, and two ends of the positioning sleeve respectively abut against the magnet group and the bearing.

[0009] Preferably, the shell is bonded and fixed to the core; the core fixing portion is in contact with the inner side surface of the shell, and one end of the core fixing portion close to the shell is an arc surface.

[0010] Preferably, the coil is wound on the outer circumference of the core fixing portion in a distributed winding manner.

[0011] Preferably, the shell is a hollow cylindrical structure, and the shell is made of metal.

[0012] Preferably, the bearing fixing portion extends to both ends of the housing.

[0013] Preferably, the bearing fixing portion includes a slot and a limiting ring, the slot is an annular recessed structure on the inner surface of the bracket, the limiting ring is positioned in the slot, and the bearing is supported on the limiting ring.

[0014] The utility model also provides an electric toothbrush, comprising any one of the above-mentioned outer-winding sonic wave motors.

[0015] Compared with the prior art, the externally wound sonic motor and electric toothbrush provided by the utility model have the following beneficial effects:

[0016] By setting an integrated plastic-molded bracket in the sonic motor, the bearing fixing parts at both ends of the bracket position the bearings, so that the bearings at both ends can be fixed in the same part at the same time, reducing installation errors, improving motor installation accuracy, and reducing vibration and noise during use. At the same time, the raised iron core fixing part in the middle of the bracket, through the raised outer side, the iron core fixing part is wound with a coil outside, and the iron core is fixed inside, which can simultaneously realize the outer winding of the coil and the insulation barrier of the iron core and coil. An integrated plastic-molded bracket realizes multiple functions, reduces the number of motor parts, reduces the number of parts installation times during the assembly process, improves product assembly efficiency, and improves product accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of an externally wound sonic wave motor provided in the first embodiment of the utility model.

[0019] Figure 2 It is a schematic diagram of the exploded structure of the outer-winding sonic wave motor provided in the first embodiment of the utility model.

[0020] Figure 3 It is a schematic cross-sectional structure diagram of an outer-winding sonic wave motor provided in the first embodiment of the utility model.

[0021] Figure 4 yes Figure 3 Magnified view of area A.

[0022] Figure 5 It is a schematic diagram of the connection structure of various parts sleeved on the rotating shaft in the outer winding sonic wave motor provided by the first embodiment of the utility model.

[0023] Description of the label:

[0024] 1. Shell;

[0025] 2. Bracket; 21. Bearing fixing part; 211. Slot; 212. Limiting ring; 22. Iron core fixing part; 23. Positioning sleeve;

[0026] 3. Iron core;

[0027] 4. Bearings;

[0028] 100, coil; 200, rotating shaft; 301, N magnet; 302, S magnet. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] It should be further understood that the term “and / or” used in the present specification 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.

[0032] Please combine Figure 1 , Figure 2 and Figure 3 The first embodiment of the utility model discloses an externally wound sonic wave motor, comprising a housing 1, a bracket 2, an iron core 3 and two bearings 4, wherein the housing 1 is arranged around the outer circumference of the bracket 2, the iron core 3 is positioned on the bracket 2, the bearings 4 are positioned at both ends of the bracket 2, and the bracket 2 is a plastic one-piece molding structure.

[0033] The bracket 2 includes bearing fixing parts 21 at both ends and an iron core fixing part 22 in the middle. The bearing 4 is arranged in the bearing fixing parts 21 at both ends. The iron core fixing parts 22 protrude from the side of the bracket 2, and multiple iron core fixing parts 22 are equidistantly arranged on the side of the bracket 2. The iron core 3 is positioned in the iron core fixing parts 22. The bracket 2 is plastic molded on the side of the iron core 3 for fixation, or the side of the iron core 3 is fixed to the iron core fixing part 22 by bonding.

[0034] The shell 1 is connected to the core fixing portion 22, and the core 3 passes through the core fixing portion 22 and contacts the shell 1. Specifically, the surface of the core 3 close to the shell 1 is bonded and fixed to the shell 1, the core fixing portion 22 contacts the inner side of the shell 1, and one end of the core fixing portion 22 close to the shell 1 is an arc surface, so as to ensure the contact stability between the shell 1 and the bracket 2.

[0035] It is understandable that Figure 2 As shown, the coil 100 is wound on the outer peripheral side of the core fixing portion 22. Based on the protruding structure of the core fixing portion 22, the coil 100 can be directly wound on the outer side of the bracket 2, avoiding the problem of inconvenient winding of the traditional inner winding. In this embodiment, the coil 100 is wound on the outer peripheral side of the core fixing portion in a distributed winding manner.

[0036] It can be understood that the bearing fixing parts 21 at both ends of the bracket 2 are an integrated structure, and the rotating shaft 200 passes through the two bearings 4 in sequence, so that the two bearings 4 are fixed together in the same part, which can have higher installation accuracy and avoid the problem of excessive installation and production errors caused by the separate setting, so that the sonic motor of the present application can have higher installation accuracy and lower vibration and noise during use.

[0037] It can be understood that the core fixing portion 22 in the middle of the bracket 2 is a raised structure, the core 3 is positioned inside the core fixing portion 22, and the coil 100 is wound outside, so that the sonic motor of the present application can realize external winding based on the raised structure, thereby improving the winding efficiency. At the same time, the core 3 can also be fixed to form an insulating plastic partition between the core 3 and the coil 100.

[0038] Please combine Figure 3 and Figure 5The rotating shaft 200 is provided with a magnet group in the area between the two bearings 4, and the magnet group includes an N magnet and an S magnet of an arc structure, and the N magnet and the S magnet are arranged in half and positioned on the rotating shaft. The length of the N magnet and the S magnet is less than or equal to the length of the iron core 3, so that the N magnet and the S magnet are always located in the surrounding area of ​​the iron core 3.

[0039] Please combine Figure 3 and Figure 4 The bearing fixing part 21 is provided with a limiting assembly for positioning the bearing, and the limiting assembly includes a slot 211 and a limiting ring 212. The slot 211 is a concave structure on the inner surface of the bearing fixing part 21. The limiting ring 212 is placed in the slot 211. The bearing 4 is pressed against the limiting ring 212 to limit the bearing 4 from falling outward. At the same time, a positioning sleeve 23 (such as Figure 5 As shown in ), the two ends of the positioning sleeve 23 are respectively abutted against the bearing 4 and the magnet assembly, limiting the freedom of the bearing 4 and the magnet assembly in the axial direction.

[0040] It is understandable that Figure 2 As shown in FIG. 1 , the housing 1 is a hollow cylindrical structure, and the housing 1 is made of metal, that is, the housing 1 is fixedly positioned on the bracket 2 by bonding with the iron core 3. The bearing fixing portion 21 extends at both ends of the housing 1.

[0041] The second embodiment of the utility model also provides an electric toothbrush, which has the outer-winding sonic motor described in the first embodiment built in. Since the connection relationship of the sonic motor driving the electric toothbrush to work is a prior art, it will not be described here.

[0042] Compared with the prior art, the externally wound sonic motor and electric toothbrush provided by the utility model have the following beneficial effects:

[0043] By setting an integrated plastic-molded bracket in the sonic motor, the bearing fixing parts at both ends of the bracket position the bearings, so that the bearings at both ends can be fixed in the same part at the same time, reducing installation errors, improving motor installation accuracy, and reducing vibration and noise during use. At the same time, the raised iron core fixing part in the middle of the bracket, through the raised outer side, the iron core fixing part is wound with a coil outside, and the iron core is fixed inside, which can simultaneously realize the outer winding of the coil and the insulation barrier of the iron core and coil. An integrated plastic-molded bracket realizes multiple functions, reduces the number of motor parts, reduces the number of parts installation times during the assembly process, improves product assembly efficiency, and improves product accuracy.

[0044] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An externally wound sonic motor, characterized in that: It comprises a housing, a bracket, an iron core and a bearing, wherein the housing is arranged around the outer periphery of the bracket, the iron core is positioned on the bracket, and the bearing is positioned at both ends of the bracket; The bracket is integrally formed, and includes bearing fixing parts at both ends and an iron core fixing part in the middle, the bearings are arranged in the bearing fixing parts at both ends, the iron core fixing parts protrude from the side of the bracket, and a plurality of the iron core fixing parts are arranged on the side of the bracket at equal intervals, and the iron core is positioned in the iron core fixing parts; The shell is connected to the core fixing portion, and the core passes through the core fixing portion and contacts the shell; The coil is wound around the outer circumference of the core fixing portion.

2. The outer-winding sonic motor according to claim 1, characterized in that: It also includes a rotating shaft, which passes through two bearings in sequence. The rotating shaft is provided with a magnet group in the area between the two corresponding bearings, and the magnet group is positioned on the rotating shaft.

3. The outer-winding sonic motor according to claim 2, characterized in that: The magnet group includes an N magnet and an S magnet of an arc-shaped structure, and the N magnet and the S magnet are arranged in half and positioned on the rotating shaft.

4. The outer-winding sonic motor according to claim 3, characterized in that: A positioning sleeve is provided between the bearing and the magnet group, and two ends of the positioning sleeve respectively abut against the magnet group and the bearing.

5. The outer-winding sonic motor according to claim 1, characterized in that: The shell is bonded and fixed to the iron core; The core fixing portion contacts the inner side surface of the shell, and one end of the core fixing portion close to the shell is an arc surface.

6. The outer-winding sonic motor according to claim 1, characterized in that: The coil is wound on the outer circumference of the core fixing portion in a distributed winding manner.

7. The outer-winding sonic motor according to claim 1, characterized in that: The shell is a hollow cylindrical structure and is made of metal.

8. The outer-winding sonic motor according to claim 7, characterized in that: The bearing fixing portion extends to both ends of the housing.

9. The outer-winding sonic motor according to claim 1, characterized in that: The bearing fixing part includes a clamping groove and a limiting ring. The clamping groove is an annular recessed structure on the inner surface of the bracket. The limiting ring is positioned in the clamping groove, and the bearing is supported on the limiting ring.

10. An electric toothbrush, characterized in that: It comprises an externally wound sonic motor as described in any one of claims 1 to 9.

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