Sound wave motor and electric toothbrush

Abstract

The utility model provides a sound wave motor, which comprises a casing, an end cover, a rotor assembly, a spring piece and a magnet, and a gap for clamping the magnet is formed between a first limiting bulge and the spring piece, so that the magnet can be fixed in the casing. Therefore, the use of a stator magnet yoke can be avoided, and the raw material cost required by the stator magnet yoke is fundamentally saved.

Description

Technical Field

[0001] This utility model relates to the field of vibration motor technology, and in particular to a sonic motor and an electric toothbrush. Background Technology

[0002] Electric toothbrushes use a vibrating motor to generate high-frequency vibrations, which can reach deep into the gaps between teeth and the surface of teeth, effectively removing plaque and food debris and improving cleaning efficiency. In traditional technologies, such as... Figure 5 As shown, the rotor assembly 3 of a conventional vibratory motor is located between two pairs of magnets, and the magnets 5 are embedded on the stator yoke 9. Relying on the alternating magnetic field generated when the winding coil is energized and the mutual attraction between the two pairs of magnets 5, the magnetic flux center of the rotor assembly 3 swings back and forth between the magnetic flux centers of the two pairs of magnets 5.

[0003] The stator yoke 9 requires raw materials such as plastic to manufacture in the traditional structure, which increases the material cost. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a sonic motor that aims to solve the problem that the stator yoke in the existing technology requires raw materials such as plastic to be manufactured, which increases the material cost.

[0005] This utility model provides a sonic motor, including a housing, an end cover, a rotor assembly, a spring plate, and magnets. The housing includes two adjacent planar portions and two arc-shaped portions. The arc-shaped portion has two first limiting protrusions, which are symmetrically arranged. The spring plate is detachably disposed on the planar portion. A gap is formed between the first limiting protrusions and the spring plate for engaging the magnets. The rotor assembly passes through a plurality of magnets, with one end extending outside the housing and the other end connected to the end cover, which is used to cover the housing.

[0006] Furthermore, the first limiting protrusion is an arc-shaped structure, formed by the recess of the housing from the outside to the inside.

[0007] Furthermore, the spring sheet includes a connecting portion and two pressing portions, the two pressing portions being disposed on both sides of the connecting portion. The connecting portion is a flat plate structure, the pressing portions are arc-shaped structures, and the pressing portions are elastic structures. The connecting portion abuts against the flat plate portion, and a gap is formed between the pressing portions and the spring sheet for engaging the magnet.

[0008] Furthermore, the arc-shaped portion is provided with a second limiting protrusion, which is used to abut against the end of the magnet.

[0009] Furthermore, the second limiting protrusion is an arc-shaped structure, formed by the housing being recessed from the outside in.

[0010] Furthermore, the rotor assembly includes a shaft, windings, an iron core, and leads. The iron core is sleeved on the shaft, the windings are wound around the iron core, and the leads are connected to the windings. One end of the shaft extends outside the housing, and the other end is connected to the end cover.

[0011] Furthermore, a first bearing is provided between the circumference of the shaft and the housing, and a second bearing is provided between the end of the shaft and the end cover.

[0012] Furthermore, the end cap has a through hole through which the lead wire can pass.

[0013] Furthermore, a felt is fitted onto the shaft.

[0014] This utility model also provides an electric toothbrush, including the sonic motor described in any of the above claims.

[0015] Beneficial effects: This utility model provides a sonic motor, including a housing, an end cover, a rotor assembly, a spring plate, and a magnet. A gap is formed between the first limiting protrusion and the spring plate for engaging the magnet, allowing the magnet to be fixed inside the housing. Therefore, this application avoids the use of a stator yoke, fundamentally saving the raw material costs required for a stator yoke. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the acoustic motor of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the acoustic motor of this utility model;

[0018] Figure 3 This is a schematic diagram of the rotor assembly installed inside the housing;

[0019] Figure 4 This is a schematic diagram of the internal structure of the casing;

[0020] Figure 5 This is a schematic diagram of the structure of a vibration motor in the prior art.

[0021] In the figure: 1. Housing; 11. Flat part; 12. Arc-shaped part; 13. First limiting protrusion; 14. Second limiting protrusion; 2. End cover; 21. Through hole; 3. Rotor assembly; 31. Shaft; 32. Winding; 33. Iron core; 34. Lead wire; 4. Spring plate; 41. Connecting part; 42. Extrusion part; 5. Magnet; 6. First bearing; 7. Second bearing; 8. Felt. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] Please see Figures 1 to 4 This utility model provides a sonic motor, including a housing 1, an end cover 2, a rotor assembly 3, a spring plate 4, and a magnet 5. The housing 1 includes two adjacent planar portions 11 and arc-shaped portions 12. Each planar portion 11 and arc-shaped portion 12 is provided with two. The arc-shaped portion 12 is provided with two first limiting protrusions 13, which are symmetrically arranged. The spring plate 4 is detachably provided on the planar portion 11. A gap is formed between the first limiting protrusions 13 and the spring plate 4 for engaging the magnet 5. The rotor assembly 3 passes through a plurality of magnets 5, with one end extending outside the housing 1 and the other end connected to the end cover 2. The end cover 2 is used to cover the housing 1.

[0024] When assembling magnet 5, using a matching tooling, magnet 5 is inserted downwards into housing 1 along a specific direction until it contacts the first limiting protrusion 13 inside housing 1. Housing 1 has multiple first limiting protrusions 13, which, together with spring sheet 4, secure magnet 5. Spring sheet 4 has a certain elasticity, providing cushioning and preload during magnet 5 installation, ensuring magnet 5 is firmly attached to housing 1 after installation. The first limiting protrusions 13 restrict the displacement direction of magnet 5, preventing it from shifting or loosening during motor operation. Finally, adhesive is used for fixation to ensure the stability of magnet 5 within housing 1 and prevent displacement.

[0025] In one feasible embodiment, the first limiting protrusion 13 is an arc-shaped structure, formed by the housing 1 being recessed from the outside in. In this embodiment, the first limiting protrusion 13 can be formed by stamping the housing 1. Compared with a stator yoke made of plastic, the stamping process is simpler and greatly reduces raw material costs.

[0026] In one feasible embodiment, the spring sheet 4 includes a connecting portion 41 and two pressing portions 42, which are disposed on both sides of the connecting portion 41. The connecting portion 41 is a flat plate structure, and the pressing portions 42 are arc-shaped and elastic. The connecting portion 41 abuts against the flat portion 11, and a gap is formed between the pressing portions 42 and the spring sheet 4 for engaging the magnet 5. The connecting portion 41 abuts against the housing 1, providing an effective support surface. The pressing portions 42 have a certain degree of elasticity, providing a certain amount of buffering and pre-tightening force when installing the magnet 5.

[0027] In one feasible embodiment, the arcuate portion 12 is provided with a second limiting protrusion 14, which abuts against the end of the magnet 5. The provision of the second limiting protrusion 14 can restrict the magnet 5 to the upward position on the axis 31, ensuring that the magnet 5 is installed in place during installation.

[0028] In one feasible implementation, the second limiting protrusion 14 is an arc-shaped structure, formed by the housing 1 being recessed from the outside to the inside.

[0029] In one feasible embodiment, the rotor assembly 3 includes a shaft 31, a winding 32, an iron core 33, and leads 34. The iron core 33 is sleeved on the shaft 31, the winding 32 is wound around the iron core 33, and the leads 34 are connected to the winding 32. One end of the shaft 31 extends outside the housing 1, and the other end is connected to the end cover 2. The shaft 31 and the iron core 33 are connected by a tight fit, specifically by firmly pressing the shaft 31 into the rotor iron core 33 to ensure a tight fixation. The iron core 33 undergoes careful powder coating treatment, which effectively ensures that the insulation performance of the rotor iron core 33 is in good condition. In this embodiment, the assembly method of the rotor assembly 3 can ensure the stability of the rotor structure and electrical safety during motor operation.

[0030] In one feasible embodiment, a first bearing 31 is provided between the periphery of the shaft 31 and the housing 1, and a second bearing 31 is provided between the end of the shaft 31 and the end cover 2.

[0031] In one feasible implementation, the end cap 2 has a through hole 21 through which the lead wire 34 can pass.

[0032] In one feasible embodiment, a felt 8 is fitted onto the shaft 31. The felt 8 is made of a soft material and can buffer external mechanical shocks and vibrations to a certain extent. The sonic motor may generate significant vibrations or impacts during operation, especially under conditions of strong high-frequency vibrations. The felt 8 can effectively absorb and mitigate these vibrations, reducing tension or pressure on the lead wire 34, thereby lowering the risk of damage or breakage of the lead wire 34. The felt 8 also has a certain degree of wear resistance, effectively preventing the lead wire 34 from rubbing against other components during prolonged use, thus extending the service life of the lead wire 34.

[0033] This utility model also provides an electric toothbrush, including the sonic motor described in any of the above claims.

[0034] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A sonic motor, characterized in that: The assembly includes a housing (1), an end cap (2), a rotor assembly (3), a spring plate (4), and a magnet (5). The housing (1) includes a planar portion (11) and an arc-shaped portion (12) that are adjacent to each other. There are two of each planar portion (11) and arc-shaped portion (12). The arc-shaped portion (12) is provided with two first limiting protrusions (13). The two first limiting protrusions (13) are symmetrically arranged. The spring plate (4) is detachably provided on the planar portion (11). A gap is formed between the first limiting protrusions (13) and the spring plate (4) for engaging the magnet (5). The rotor assembly (3) passes through a plurality of magnets (5) and extends one end to the outside of the housing (1) and the other end is connected to the end cap (2). The end cap (2) is used to cover the housing (1).

2. The acoustic motor according to claim 1, characterized in that: The first limiting protrusion (13) is an arc-shaped structure, formed by the housing (1) being recessed from the outside to the inside.

3. The acoustic motor according to claim 1, characterized in that: The spring sheet (4) includes a connecting part (41) and two pressing parts (42). The two pressing parts (42) are located on both sides of the connecting part (41). The connecting part (41) is a flat plate structure, and the pressing part (42) is an arc-shaped structure. The pressing part (42) is an elastic structure. The connecting part (41) abuts against the flat part (11). A gap is formed between the pressing part (42) and the spring sheet (4) for engaging the magnet (5).

4. The acoustic motor according to claim 1, characterized in that: The arc-shaped portion (12) is provided with a second limiting protrusion (14), which is used to abut against the end of the magnet (5).

5. The acoustic motor according to claim 4, characterized in that: The second limiting protrusion (14) is an arc-shaped structure, formed by the housing (1) being recessed from the outside to the inside.

6. The acoustic motor according to claim 1, characterized in that: The rotor assembly (3) includes a shaft (31), a winding (32), an iron core (33), and a lead wire (34). The iron core (33) is sleeved on the shaft (31), the winding (32) is wound around the iron core (33), and the lead wire (34) is connected to the winding (32). One end of the shaft (31) extends outside the housing (1), and the other end is connected to the end cover (2).

7. The acoustic motor according to claim 6, characterized in that: A first bearing (31) is provided between the periphery of the shaft (31) and the housing (1), and a second bearing (31) is provided between the end of the shaft (31) and the end cover (2).

8. The acoustic motor according to claim 6, characterized in that: The end cap (2) has a through hole (21) through which the lead wire (34) can pass.

9. The acoustic motor according to claim 6, characterized in that: A felt (8) is fitted onto the shaft (31).

10. An electric toothbrush, characterized in that, Includes the acoustic motor according to any one of claims 1-9.

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