Rotor limiting structure, sound wave motor and electric toothbrush

Abstract

The utility model discloses a rotor limiting structure, a sound wave motor and an electric toothbrush. A rotor limiting structure comprises a rotor and an end cover. The rotor is provided with a rotating shaft, and one end of the rotating shaft is rotationally connected to the end cover; a coaxial limiting table is arranged on the rotating shaft, a limiting groove is formed in the end cover, the limiting table is located in the limiting groove, and when the rotor rotates, the limiting table abuts against the limiting groove to conduct deflection limiting on the rotor. According to the rotor limiting structure provided by the utility model, in the deflection operation process of the rotor, the limiting table and the limiting groove are matched with each other to achieve a positioning effect so as to ensure that the rotor cannot rotate to the magnetic force range of the stator, so that not only is the problem of rotor deflection limiting solved, but also the rotor is not restrained by steel needles (steel sheets) and does not need to additionally consume energy; the utilization rate of converting electric energy into kinetic energy is higher, more energy is saved, and the battery endurance time is longer.

Description

Technical Field

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

[0002] At present, in the sonic motor industry, the rotor positioning method uses external force constraints such as steel needles or steel sheets. During the yaw operation of the rotor, the steel needle (steel sheet) can prevent the rotor from rotating into the magnetic force range of the stator. However, while positioning the rotor, this method also brings additional energy loss. During the yaw movement of the rotor, part of the kinetic energy needs to be consumed to overcome the inherent binding force of the steel needle (steel sheet) structure, reducing the battery life. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a rotor limiting structure for the above technical problems.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] In a first aspect, a rotor limiting structure includes a rotor and an end cover; the rotor has a rotating shaft, and one end of the rotating shaft is rotatably connected to the end cover; a coaxial limiting platform is arranged on the rotating shaft, a limiting groove is arranged on the end cover, the limiting platform is located in the limiting groove, and when the rotor rotates, the limiting platform abuts against the limiting groove to limit the deflection of the rotor.

[0006] As a preferred embodiment of a rotor limiting structure provided by the utility model, the limiting platform has four corner parts, and two corner parts in a diagonal relationship synchronously abut against the side wall of the limiting groove.

[0007] As a preferred embodiment of a rotor limiting structure provided by the utility model, the cross-section of the limiting platform in the horizontal direction is oval, racetrack-shaped, square, rectangular or X-shaped.

[0008] As a preferred embodiment of a rotor limiting structure provided by the utility model, the cross-section of the limiting groove in the horizontal direction is oval, racetrack-shaped, square or rectangular.

[0009] As a preferred embodiment of a rotor limiting structure provided by the utility model, in the horizontal direction, the groove width dimension of the limiting groove is respectively larger than the width dimension of the limiting platform.

[0010] As a preferred embodiment of a rotor limiting structure provided by the utility model, a shaft hole is arranged on the end cover, and one end of the rotating shaft is rotatably connected in the shaft hole; in the top view state, the shaft hole is located at the center of the limiting groove; in the longitudinal direction, the shaft hole is located at the lower part of the limiting groove.

[0011] As a preferred embodiment of a rotor limiting structure provided by the present utility model, at least one oil storage groove is provided beside the shaft hole.

[0012] As a preferred embodiment of a rotor limiting structure provided by the present utility model, the limiting platform is integrally formed on the rotating shaft.

[0013] In a second aspect, a sonic motor includes any of the above-mentioned rotor limiting structures.

[0014] As a preferred embodiment of a rotor limiting structure provided by the present utility model, the sonic motor further includes an output shaft; a deep hole is provided at the other end of the rotating shaft of the rotor, and a clamping portion is provided at one end of the output shaft. During installation, the clamping portion of the output shaft is snapped into the deep hole to realize the connection between the output shaft and the rotor.

[0015] In a third aspect, an electric toothbrush includes the above-mentioned rotor limiting structure or the above-mentioned sonic motor.

[0016] Compared with the prior art, the present utility model has the following beneficial effects:

[0017] For the rotor limiting structure provided by the present utility model, a coaxial limiting platform is provided on the rotating shaft of the rotor, and a limiting groove is provided on the end cover. The limiting platform is located in the limiting groove. When the rotor rotates, the limiting platform abuts against the limiting groove to limit the deflection of the rotor. Through the above structural design, during the yaw operation of the rotor, the limiting platform and the limiting groove cooperate with each other to achieve a positioning effect, so as to ensure that the rotor does not rotate into the magnetic force range of the stator. It not only solves the problem of rotor deflection limitation, but also the rotor is not restricted by steel needles (steel sheets), without additional energy consumption. That is, the utilization rate of converting electrical energy into kinetic energy is higher, more energy-saving, and the battery life is longer. Description of the Drawings

[0018] In order to more clearly illustrate the solutions in the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the rotor limiting structure provided by the present utility model;

[0020] Figure 2 is Figure 1 a partial exploded view of;

[0021] Figure 3Front view schematic diagram of the overall structure of the rotor limiting structure provided by the present utility model;

[0022] Figure 4 It is Figure 3 The sectional perspective view at A-A in

[0023] Figure 5 Schematic diagram of the structure of the acoustic wave motor provided by the present utility model;

[0024] Figure 6 It is Figure 5 Partial exploded view of

[0025] Figure 7 It is Figure 5 Partial exploded view of , the housing and the stator are hidden in the figure.

[0026] The markings in the figure are explained as follows:

[0027] 1. Rotor, 11. Rotating shaft, 12. Magnet, 13. Limiting platform, 14. Outer convex, 15. Deep hole;

[0028] 2. End cover, 21. Shaft hole, 22. Limiting groove, 23. Oil storage groove;

[0029] 3. Housing;

[0030] 4. Stator;

[0031] 5. Output shaft, 51. Clamping part. Specific implementation manner

[0032] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0033] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0035] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] Embodiment 1 Rotor Limiting Structure

[0037] Please refer to Figures 1-4 , this embodiment shows a rotor limiting structure. Specifically, the rotor limiting structure includes:

[0038] A rotor 1, which has a rotating shaft 11 and magnets 12 and a limiting platform 13 arranged on the rotating shaft 11 along its axial direction respectively;

[0039] An end cover 2, which has a shaft hole 21 and a limiting groove 22. In a top view state, the shaft hole 21 is located at the center of the limiting groove 22; in a longitudinal direction, the shaft hole 21 is located at the lower part of the limiting groove 22; one end of the rotating shaft 11 is rotatably connected to the shaft hole 21, and the limiting platform 13 is located in the limiting groove 22.

[0040] The limiting platform 13 is arranged on one side of the rotating shaft 11 close to the end and is coaxially arranged with the rotating shaft 11, so as to facilitate the synchronous rotation of the rotating shaft 11. The limiting platform 13 has four corner parts 131, and two corner parts 131 in a diagonal relationship are synchronously abutted against the side wall of the limiting groove 22 to play a limiting role. Preferably, in the horizontal direction, the cross-section of the limiting platform 13 is oval, or it can also be other regular shapes such as a racetrack shape, a square, an X shape, or a rectangle. In this embodiment, the racetrack shape is taken as an example.

[0041] In the horizontal direction, the cross-section of the limiting groove 22 is oval, racetrack shape, square or rectangle and other regular shapes. In this embodiment, the racetrack shape is preferably selected. In the horizontal direction, the transverse width dimension of the limiting groove 22 is respectively larger than the transverse width dimension of the limiting platform 13. With such a design, the large-size groove space of the limiting groove 22 facilitates the deflection of the limiting platform 13 along with the rotating shaft 11, and at the same time, the side wall of the limiting groove 22 is used to limit the limiting platform 13. When the rotor 1 rotates, the limiting platform 13 abuts against the side wall of the limiting groove 22 to limit the deflection of the rotor 1, and prevent the rotor 1 from rotating excessively into the magnetic force range of the stator 4.

[0042] It should be noted that the shape of the above-mentioned limiting platform 13, the shape of the limiting groove 22, and their respective transverse width dimensions are not limited to the above-mentioned limitations. The limiting platform 13 and the limiting groove 22 cooperate with each other to control the deflection angle of the rotor 1 within a preset angle range, and the limiting platform 13 and the limiting groove 22 with other parameters (shape, size, etc.) that meet this condition are also acceptable.

[0043] Furthermore, the limiting platform 13 is integrally formed on the rotating shaft 11. With such a structural design, the limiting platform 13 does not require an additional installation process, and also avoids the hidden danger of loosening during installation.

[0044] Further, an oil storage groove 23 is provided on the side of the end cover 2 at the shaft hole 21. There may be one, two, three or more oil storage grooves 23. The oil storage groove 23 communicates with the shaft hole 21 and is used to store lubricating oil to provide longer rotational lubrication for the rotating shaft 11.

[0045] Embodiment 2: Sonic motor

[0046] Please refer to Figures 5-7 , this embodiment shows a sonic motor, which includes a rotor limiting structure as shown in Embodiment 1, and also includes a housing 3, a stator 4 disposed in the housing 3, and an output shaft 5.

[0047] The end cover 2 of the rotor limiting structure can be the front cover of the motor or the rear cover of the motor. In this embodiment, it is preferably the rear cover of the motor.

[0048] Further, a deep hole 15 is formed at the other end of the rotating shaft 11, and a clamping portion 51 is provided at one end of the output shaft 5. During installation, the clamping portion 51 of the output shaft 5 is snapped into the deep hole 15, and the output shaft 5 and the rotor 1 can be stably connected without bonding.

[0049] The clamping portion 51 can be formed by embossing on the surface of the output shaft 5 and directly pressed into the deep hole 15 of the rotating shaft 11, so that the connection between the rotor 1 and the output shaft 5 can be completed, simplifying the operation method.

[0050] The rotor 1 of this embodiment is made of plastic material, and the rotor 1 can be integrally formed by injection molding; an outer convex portion 14 and a deep hole 15 are respectively designed at both ends of the rotating shaft 11. The outer convex portion 14 is installed on the shaft hole 21 of the end cover 2, and the limiting platform 13 beside the outer convex portion 14 is located in the limiting groove 22. The deep hole 15 is press-fitted and connected with the embossed portion of the output shaft 5, and the installation is simple and the connection is stable.

[0051] Embodiment 3: Electric toothbrush

[0052] This embodiment shows an electric toothbrush, which includes a rotor limiting structure as shown in Embodiment 1 or a sonic motor as shown in Embodiment 2.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Obviously, the embodiments described above are only a part of the embodiments of the present utility model, rather than all of them. The preferred embodiments of the present utility model are shown in the accompanying drawings, but they do not limit the patent scope of the present utility model. The present utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structures made by using the content of the specification and drawings of the present utility model, directly or indirectly applied to other related technical fields, are equally within the scope of the patent protection of the present utility model.

Claims

1. A rotor limiting structure, characterized in that: It includes a rotor and an end cover; the rotor has a rotating shaft, one end of which is rotatably connected to the end cover; a coaxial limit platform is arranged on the rotating shaft, a limit groove is arranged on the end cover, the limit platform is located in the limit groove, and when the rotor rotates, the limit platform abuts against the limit groove to limit the deflection of the rotor.

2. A rotor limiting structure according to claim 1, characterized in that: The limiting platform has four corner portions, and two corner portions in a diagonal relationship synchronously abut against the side wall of the limiting groove.

3. A rotor limiting structure according to claim 1, characterized in that: The cross section of the limiting platform in the horizontal direction is oval, track-shaped, square, rectangular or X-shaped.

4. A rotor limiting structure according to claim 1, characterized in that: The cross section of the limiting groove in the horizontal direction is oval, track-shaped, square or rectangular.

5. A rotor limiting structure according to claim 1, characterized in that: In the horizontal direction, the transverse width of the limiting groove is larger than the transverse width of the limiting platform.

6. A rotor limiting structure according to claim 1, characterized in that: The end cover is provided with an axial hole, and one end of the rotating shaft is rotatably connected in the axial hole; in a top view, the axial hole is located in the center of the limiting groove; in a longitudinal direction, the axial hole is located in the lower part of the limiting groove.

7. A rotor limiting structure according to claim 6, characterized in that: At least one oil storage tank is arranged beside the shaft hole.

8. A rotor limiting structure according to any one of claims 1 to 7, characterized in that: The limiting platform is integrally formed on the rotating shaft.

9. A sonic motor, characterized in that: It includes a rotor limiting structure as described in any one of claims 1-8; the sonic motor also includes an output shaft; a deep hole is opened at the other end of the rotor's rotating shaft, and a clamping part is provided at one end of the output shaft. During installation, the clamping part of the output shaft is clamped into the deep hole to realize the connection between the output shaft and the rotor.

10. An electric toothbrush, characterized in that: It includes the rotor limiting structure according to any one of claims 1 to 8 or the sonic motor according to claim 9.

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