Driving mechanism for electric toothbrush

Abstract

Disclosed in the present invention is a driving mechanism for an electric toothbrush, comprising a shell, wherein a first stator iron core and a second stator iron core are vertically provided in the shell; a first rotor is vertically provided in the first stator iron core, and the first rotor rotates in the first stator iron core; a driving shaft is vertically inserted into the first rotor; a second rotor and a third rotor are vertically provided in the second stator iron core, respectively, and the second rotor and the third rotor float up and down in the second stator iron core; a first elastic piece cover and a second elastic piece cover are transversely provided on the upper and lower ends of the shell, respectively, and the driving shaft penetrates through the first elastic piece cover and the second elastic piece cover; a first elastic piece plate is transversely formed on the top end of the first elastic piece cover, and the top end of the driving shaft penetrates through the first elastic piece plate; a second elastic piece plate is transversely formed on the bottom end of the second elastic piece cover, and the bottom end of the driving shaft penetrates through the second elastic piece plate.

Description

Drive mechanism for electric toothbrush Technical Field

[0001] The present invention relates to the field of electric toothbrushes, in particular to a driving mechanism for electric toothbrushes. Background Art

[0002] Existing electric toothbrushes usually use rotary motors, magnetic levitation motors and sonic motors as driving sources to drive and realize a certain driving mode of the electric toothbrush. This results in the use of electric toothbrushes being relatively simple and requiring a rotary motor with two degrees of freedom motion as a driving source. Technical issues

[0003] However, many existing two-degree-of-freedom rotary motors have complex structures, many parts that are difficult to manufacture, and unreasonable layout structures, resulting in a large overall size and slow response, making them inconvenient to install on precision tools and electric toothbrushes. In addition, the linear motion arc stator has a complex structure, is difficult to manufacture precisely, and the motor shaft is not stable enough. Therefore, a drive mechanism for an electric toothbrush is proposed. Technical Solutions

[0004] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0005] The driving mechanism for an electric toothbrush includes a shell, a first stator core and a second stator core are vertically arranged inside the shell, and a first rotor is vertically arranged inside the first stator core, and the first rotor rotates inside the first stator core, a driving shaft is vertically inserted inside the first rotor, and the driving shaft and the first rotor rotate in the same direction, a second rotor and a third rotor are vertically arranged inside the second stator core, respectively, and the second rotor and the third rotor are parallel to each other, the second rotor and the third rotor float up and down inside the second stator core, and the driving shaft passes through the second rotor and the third rotor, a first elastic fragment cover and a second elastic fragment cover are horizontally arranged at the upper and lower ends of the shell, respectively, and the driving shaft passes through the first elastic fragment cover and the second elastic fragment cover, a first elastic fragment plate is horizontally formed at the top end of the first elastic fragment cover, and the top end of the driving shaft passes through the first elastic fragment plate, a second elastic fragment plate is horizontally formed at the bottom end of the second elastic fragment cover, and the bottom end of the driving shaft passes through the second elastic fragment plate.

[0006] Preferably, the first stator core is laterally provided with a first stator core mounting seat, and the first stator core mounting seat is laterally located at the upper and lower ends of the first stator core respectively, and the first stator core is vertically fixed to the top end inside the shell through the first stator core mounting seat.

[0007] Preferably, the first rotor is provided with a plurality of first rotor poles, and the plurality of first rotor poles are vertically distributed on the side wall outside the first rotor, and the first rotor is driven to rotate inside the first stator core by the plurality of first rotor poles.

[0008] Preferably, the second stator core is laterally provided with a second stator core mounting seat, and the second stator core mounting seat is laterally located at the upper and lower ends of the second stator core respectively, and the second stator core is vertically fixed to the bottom end inside the shell through the second stator core mounting seat.

[0009] Preferably, the second rotor is provided with a plurality of second rotor poles, and the plurality of second rotor poles are vertically distributed on the side wall outside the second rotor, and the second rotor is driven to float up and down inside the second stator core by the plurality of second rotor poles.

[0010] Preferably, the third rotor is provided with a plurality of third rotor poles, and the plurality of third rotor poles are vertically distributed on the side wall outside the third rotor, and the third rotor is driven to float up and down inside the second stator core by the plurality of third rotor poles.

[0011] Preferably, a first bearing is provided between the first elastic plate and the drive shaft, and the first bearing is transversely arranged in the middle of the first elastic plate, and the drive shaft passes through the first bearing;

[0012] A second bearing is provided between the second elastic plate and the driving shaft, and the second bearing is transversely arranged at a middle position of the second elastic plate, and the driving shaft passes through the second bearing. Beneficial effects

[0013] Compared with the prior art, the present invention has the following advantages: the rotor that controls the up and down movement of the drive shaft has multiple magnetic poles arranged in an alternating manner and closely attached to both sides of the rotor. The two sides of the rotor are also closely attached to the stator core. By changing the direction of the current inside the stator core, the rotor can be controlled to drive the drive shaft to move forward and backward, and the operation is stable.

[0014] The mechanism for controlling the up and down movement of the drive shaft in this patent is arranged at the bottom end of the housing, and the rotating mechanism is arranged at the top end of the housing. This layout is reasonable, the overall motor housing has a small diameter and is light in weight, making it very suitable for use as a motor for an electric toothbrush and convenient to hold in the hand.

[0015] The drive shaft can achieve three motion modes: slight left-right vibration and up-and-down telescopic motion. Of course, it can also achieve vibration without forward and backward telescopic motion, or forward and backward telescopic motion without vibration. It is suitable for use as a motor for electric toothbrushes.

[0016] The first spring cover and the second spring cover can be deformed and reset under force; at the same time, the first spring cover and the second spring cover are formed with a first spring plate and a second spring plate, forming an elastic deformation structure that is deformed under pressure, which can buffer the collision force and reduce the rigid collision loss. At the same time, it can also better support and restrain the motor shaft to prevent large shaking.

[0017] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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.

[0019] FIG1 is a schematic structural diagram of a driving mechanism for an electric toothbrush;

[0020] FIG2 is another schematic structural diagram of a driving mechanism for an electric toothbrush;

[0021] FIG3 is another schematic structural diagram of a driving mechanism for an electric toothbrush;

[0022] FIG4 is a schematic structural diagram of the first stator core;

[0023] FIG5 is a schematic structural diagram of the first rotor;

[0024] FIG6 is a schematic structural diagram of a first elastic cover;

[0025] FIG7 is a schematic structural diagram of the second elastic cover.

[0026] Shown in the figure: 1. Housing, 2. Drive shaft, 3. First spring cover, 4. Second spring cover, 5. First stator core, 6. First rotor, 7. Second stator core, 8. Second rotor, 9. Third rotor, 10. First stator core mounting seat, 11. Second stator core mounting seat, 12. First rotor pole, 13. Second rotor pole, 14. First bearing, 15. Second bearing, 16. Third rotor pole, 17. First spring plate, 18. Second spring plate. Modes for Carrying Out the Invention

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0028] Please refer to Figures 1-7. In the embodiment of the present invention, the driving mechanism for an electric toothbrush includes a shell 1, and a first stator core 5 and a second stator core 7 are vertically arranged inside the shell 1, and the first stator core 5 is located at the top end of the shell 1, and the second stator core 7 is located at the bottom end of the shell 1. A first rotor 6 is vertically arranged inside the first stator core 5, and the first rotor 6 rotates inside the first stator core 5. A driving shaft 2 is vertically inserted inside the first rotor 6, and the driving shaft 2 and the first rotor 6 rotate in the same direction, and the first rotor 6 drives the driving shaft 2 to rotate inside the first stator core 5. A second rotor 8 and a third rotor 9 are vertically arranged inside the second stator core 7, respectively, and the second rotor 8 and the third rotor 9 are parallel to each other. The second rotor 8 and the third rotor 9 float up and down inside the second stator core 7, and the driving shaft 2 passes through the second rotor 8 and the third rotor 9, and the second rotor 8 and the third rotor 9 are parallel to each other. The three rotors 9 drive the drive shaft 2 to float up and down inside the second stator core 7. The upper and lower ends of the housing 1 are respectively provided with a first elastic cover 3 and a second elastic cover 4, and the drive shaft 2 passes through the first elastic cover 3 and the second elastic cover 4. The top end of the first elastic cover 3 is laterally formed with a first elastic plate 17, and the top end of the drive shaft 2 passes through the first elastic plate 17, and a first retaining spring (not shown in the figure) is laterally inserted between the first elastic plate 17 and the drive shaft 2. The bottom end of the second elastic cover 4 is laterally formed with a second elastic plate 18, and the bottom end of the drive shaft 2 passes through the second elastic plate 18, and a second retaining spring (not shown in the figure) is laterally inserted between the second elastic plate 18 and the drive shaft 2. Therefore, through the first retaining spring and the second retaining spring, the drive shaft 2 floats up and down inside the housing 1 together with the first elastic plate 17 and the second elastic plate 18, and the drive shaft 2 can rotate between the first elastic plate 17 and the second elastic plate 18 when floating up and down.

[0029] The working process of controlling the forward and backward movement of the drive shaft is that when the second stator core 7 is energized, an electromagnetic field is formed. In the initial position, the second rotor magnetic pole 12 and the third rotor magnetic pole 16 on the side of the second rotor 8 and the third rotor 9 are located in the middle position of the second stator core 7. By changing the direction of the current in the second stator core 7, the N pole and S pole of the electromagnetic field are directed toward the second rotor magnetic pole 12 and the third rotor magnetic pole 16, forcing the second rotor 8 and the third rotor 9 to slide upward by the repulsive force. The second rotor 8 and the third rotor 9 are fixedly connected to the drive shaft 2. At this time, the drive shaft 2 is supported by the front and rear two bearings and the spring. The resistance of the cover prevents the rotor from moving forward, forcing the second rotor 8 and the third rotor 9 and the motor shaft to move downward. The movement is the same as when moving upward. By changing the direction of the current to change the direction of the magnetic field, the magnetic poles are subjected to resistance and attraction, thereby driving the second rotor 8 and the third rotor 9 to move up and down together with the drive shaft 2. When the second rotor 8 and the third rotor 9 slide to the end, that is, the second rotor magnetic pole 12 and the third rotor magnetic pole 16 on the side of the second rotor 8 and the third rotor 9 are located in the middle of the second stator core 7, returning to the state of the initial position, thereby forming the forward and backward movement of the drive shaft. This structural layout is reasonable, the overall volume is small, the manufacturing difficulty is low, and the response is fast and the operation is stable.

[0030] The first stator core 5 is laterally provided with a first stator core mounting seat 10, and the first stator core mounting seat 10 is laterally located at the upper and lower ends of the first stator core 5, and the first stator core 5 is vertically fixed to the top end inside the shell 1 through the first stator core mounting seat 10.

[0031] The first rotor 6 is provided with a plurality of first rotor poles 12 , and the plurality of first rotor poles 12 are vertically distributed on the side wall outside the first rotor 6 , and the first rotor 6 is driven to rotate inside the first stator core 5 by the plurality of first rotor poles 12 .

[0032] The second stator core 7 is laterally provided with a second stator core mounting seat 11, and the second stator core mounting seat 11 is laterally located at the upper and lower ends of the second stator core 7, and the second stator core 7 is vertically fixed to the bottom end of the shell 1 through the second stator core mounting seat 11.

[0033] The second rotor 8 is provided with a plurality of second rotor poles 13, and the plurality of second rotor poles 13 are vertically distributed on the side wall outside the second rotor 8, and the second rotor 8 is driven by the plurality of second rotor poles 13 to float up and down inside the second stator core 7.

[0034] The third rotor 9 is provided with a plurality of third rotor poles 16 , and the plurality of third rotor poles 16 are vertically distributed around the side wall outside the third rotor 9 , and the third rotor 9 is driven by the plurality of third rotor poles 16 to float up and down inside the second stator core 7 .

[0035] A first bearing 14 is provided between the first elastic plate 17 and the drive shaft 2 , and the first bearing 14 is transversely arranged in the middle of the first elastic plate 17 , and the drive shaft 2 passes through the first bearing 14 ;

[0036] A second bearing 15 is provided between the second elastic plate 18 and the drive shaft 2 . The second bearing 15 is laterally disposed in the middle of the second elastic plate 18 , and the drive shaft 2 passes through the second bearing 15 .

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A drive mechanism for an electric toothbrush, comprising a housing, characterized in that, Inside the housing, a first stator core and a second stator core are vertically arranged. Inside the first stator core, a first rotor is vertically arranged, and the first rotor rotates inside the first stator core. Inside the first rotor, a drive shaft is vertically inserted, and the drive shaft rotates in the same direction as the first rotor. Inside the second stator core, a second rotor and a third rotor are vertically arranged respectively, and the second rotor and the third rotor are parallel to each other. The second rotor and the third rotor float up and down inside the second stator core, and the drive shaft passes through the second rotor and the third rotor. At the upper and lower ends of the housing, a first spring plate cover and a second spring plate cover are horizontally arranged respectively, and the drive shaft passes through the first spring plate cover and the second spring plate cover. At the top of the first spring plate cover, a first spring plate is horizontally formed, and the top end of the drive shaft passes through the first spring plate. At the bottom of the second spring plate cover, a second spring plate is horizontally formed, and the bottom end of the drive shaft passes through the second spring plate.

2. The drive mechanism for an electric toothbrush according to claim 1, wherein, The first stator core is horizontally provided with a first stator core mounting seat, and the first stator core mounting seats are respectively horizontally located at the upper and lower ends of the first stator core, and the first stator core is vertically fixed at the top end inside the housing through the first stator core mounting seat.

3. The drive mechanism for an electric toothbrush according to claim 1, characterized in that, The first rotor is provided with a plurality of first rotor magnetic poles, and the plurality of first rotor magnetic poles are vertically and circumferentially distributed on the outer side wall of the first rotor, and the first rotor is driven to rotate inside the first stator core through the plurality of first rotor magnetic poles.

4. The drive mechanism for an electric toothbrush according to claim 1, characterized in that, The second stator core is horizontally provided with a second stator core mounting seat, and the second stator core mounting seats are respectively horizontally located at the upper and lower ends of the second stator core, and the second stator core is vertically fixed at the bottom end inside the housing through the second stator core mounting seat.

5. The drive mechanism for an electric toothbrush according to claim 1, wherein The second rotor is provided with a plurality of second rotor magnetic poles, and the plurality of second rotor magnetic poles are vertically and circumferentially distributed on the outer side wall of the second rotor, and the second rotor is driven to float up and down inside the second stator core through the plurality of second rotor magnetic poles.

6. The drive mechanism for an electric toothbrush according to claim 1, wherein, The third rotor is provided with a plurality of third rotor magnetic poles, and the plurality of third rotor magnetic poles are vertically and circumferentially distributed on the outer side wall of the third rotor, and the third rotor is driven to float up and down inside the second stator core through the plurality of third rotor magnetic poles.

7. The drive mechanism for an electric toothbrush according to claim 1, wherein A first bearing is arranged between the first spring plate and the drive shaft, and the first bearing is horizontally arranged at the middle position of the first spring plate, and the drive shaft passes through the first bearing; A second bearing is arranged between the second spring plate and the drive shaft, and the second bearing is horizontally arranged at the middle position of the second spring plate, and the drive shaft passes through the second bearing.

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