Motor assembly of electric toothbrush and electric toothbrush

Abstract

A motor assembly of an electric toothbrush comprises a motor shaft, a rotary driving rotor assembly, a rotary driving stator assembly, a linear driving rotor assembly, a linear driving stator assembly and a bearing, and the rotary driving rotor assembly and the linear driving rotor assembly are fixed on the motor shaft. The two motors respectively drive the motor shaft to do rotary motion and linear motion under the action of the rotary driving stator assembly and the linear driving stator assembly; the bearing comprises an outer ring and an inner ring, a retaining space is formed in the outer ring, and the axial length of the retaining space is larger than that of the inner ring; a ball is embedded in the inner ring, and the inner ring is arranged on the motor shaft in a sleeving mode, makes rolling contact with the motor shaft through the ball and is installed in the maintaining space at the same time. Compared with the prior art, the motor assembly and the electric toothbrush can rotate left and right and move front and back, in addition, the movement effect of the bearing inner ring is better, and the requirement for the bearing is lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor components, and in particular relates to a motor component of an electric toothbrush and an electric toothbrush using the motor component. Background Art

[0002] In order to improve the cleaning effect and use effect of electric toothbrushes, existing electric toothbrushes have the function of swinging left and right as well as the function of moving forward and backward, such as the invention patent with publication number CN117318427A, which provides an electric toothbrush with both the function of swinging left and right and the function of moving forward and backward. When realizing the left and right swinging function, the motor shaft is supported by the bearing on the bearing seat (the motor shaft can drive the brush head to move), so that the motor shaft can be supported and can rotate left and right at the same time. On this basis, in order to further realize the function of moving forward and backward, the electric toothbrush selects the bearing seat as an elastic structure, and the bearing seat can be deformed forward and backward to support the bearing to move forward and backward, and finally realize the forward and backward movement of the motor shaft. Then, the bearing seat with an elastic structure is used to support the forward and backward movement of the motor shaft and the bearing. The resistance of the motor shaft is large during the forward and backward movement, which greatly reduces the endurance and use experience of the electric toothbrush. In addition, the structure has high performance requirements for the bearing seat and high cost. If a low-performance bearing seat is used, it is easy to fatigue and has a short service life. Utility Model Content

[0003] The utility model aims to overcome the deficiencies in the prior art and provide a motor assembly for an electric toothbrush.

[0004] To achieve the above purpose, the utility model discloses a motor assembly of an electric toothbrush, comprising a motor shaft, a rotary drive moving subassembly, a rotary drive stator assembly, a linear drive moving subassembly, a linear drive stator assembly and a bearing, wherein the rotary drive moving subassembly and the linear drive moving subassembly are fixed on the motor shaft, and the two drive the motor shaft to perform rotary motion and linear motion under the action of the rotary drive stator assembly and the linear drive stator assembly respectively;

[0005] The bearing comprises an outer ring and an inner ring, wherein a retaining space is provided in the outer ring, and an axial length of the retaining space is greater than an axial length of the inner ring; the inner ring is embedded with balls, the inner ring is sleeved on the motor shaft and in rolling contact with the motor shaft through the balls, and is installed in the retaining space at the same time.

[0006] Preferably, the difference between the axial length of the retaining space and the axial length of the inner ring is 0.5 mm-5 mm.

[0007] Preferably, the outer ring is in a straight cylindrical shape, and the bearing further comprises a first end cover and a second end cover, which are respectively covered at both ends of the outer ring and are both provided with a limiting structure for limiting the inner ring from sliding out.

[0008] Further preferably, both ends of the outer ring are provided with a slot, the first end cover and the second end cover both include an axially arranged plug-in portion and a radially arranged limiting structure, the plug-in portion is inserted into the slot, and the outer side walls of the two are coplanar.

[0009] Further preferably, the first end cover and / or the second end cover is detachably connected to the outer ring.

[0010] Preferably, the motor shaft is an integrally formed structure.

[0011] Preferably, the rotary drive stator assembly includes six groups of coil windings, and the six groups of coil windings are evenly distributed along the periphery of the rotary drive mover assembly.

[0012] The utility model also provides an electric toothbrush using the motor assembly.

[0013] An electric toothbrush comprises a shell and a motor assembly arranged in the shell, wherein the motor assembly is any one of the motor assemblies described above.

[0014] Preferably, a bearing seat is further provided in the outer shell, and the bearing seat includes an inner cylinder, an outer cylinder and a plurality of connecting parts, the inner cylinder and the outer cylinder are connected by the plurality of connecting parts, and the space between two adjacent connecting parts is hollow, the bearing is connected in the inner cylinder, and the outer cylinder is connected to the outer shell.

[0015] Preferably, the shell comprises a split multi-section shell, and two adjacent sections of the shell are welded and fixed.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The motor shaft is connected to the inner ring of the bearing and is in rolling contact with the balls on the inner ring. In this way, the motor shaft can rotate left and right relative to the inner ring through the balls, and can also move forward and backward relative to the inner ring. The motor shaft is only subject to rolling friction during movement, and the movement resistance is smaller, which is conducive to improving the battery life and user experience of the electric toothbrush. In addition, compared with the traditional elastic bearing seat, this structure is more stable and reliable to use, and has a longer service life.

[0018] Since the axial length of the retaining space of the outer ring is greater than that of the inner ring, the inner ring can not only rotate relative to the outer ring but also move relative to the outer ring under the drive of the motor shaft, and the movement of the inner ring is smoother, further improving the use effect; in addition, since the axial length of the retaining space is greater than that of the inner ring, it has a larger installation space and is easy to be installed in the retaining space during assembly, which reduces the axial processing size requirements of the outer ring and reduces the manufacturing cost of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of an electric toothbrush in an embodiment;

[0020] Figure 2 for Figure 1 A cross-sectional view of an electric toothbrush;

[0021] Figure 3 The figure is a schematic diagram of the three-dimensional decomposition structure of the bearing;

[0022] Figure 4 is a cross-sectional view of the bearing;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the bearing seat;

[0024] Motor shaft 1;

[0025] Rotation drive movable subassembly 2; bracket 21; magnetic sheet 22;

[0026] Rotating driving stator assembly 3; coil winding 31; first bobbin 32; first coil 33;

[0027] Linear drive mover assembly 4; magnetic ring 41;

[0028] Linear drive stator assembly 5; second bobbin 51; second iron core 52;

[0029] Bearing 6; outer ring 61; holding space 611; slot 612; inner ring 62; ball 621; first end cover 63; second end cover 64; plug-in portion 641; limiting structure 642;

[0030] Housing 7; bearing seat 8; inner cylinder 81; outer cylinder 82; connecting piece 83. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Example 1

[0033] A motor assembly for an electric toothbrush, see Figure 1-Figure 4 , including a motor shaft 1, a rotary drive mover assembly 2, a rotary drive stator assembly 3, a linear drive mover assembly 4, a linear drive stator assembly 5 and a bearing 6. The rotary drive mover assembly 2 and the linear drive mover assembly 4 are fixed on the motor shaft 1, and the two drive the motor shaft 1 to perform rotational motion and linear motion under the action of the rotary drive stator assembly 3 and the linear drive stator assembly 5 respectively.

[0034] Among them, the rotary drive stator assembly 3 includes multiple groups of coil windings, and the multiple coil windings 31 are evenly distributed along the outer periphery of the rotary drive mover assembly 2. Each coil winding 31 includes a first bobbin 32, a first coil 33 wound on the first bobbin, and a first iron core arranged in the first bobbin 32. The rotary drive mover assembly 2 includes a bracket 21 and a magnetic sheet 22 arranged on the bracket 21. There can be multiple magnetic sheets 22, and the number of the magnetic sheets 22 in this embodiment is the same as that of the coil winding 31. After the first coil 33 is energized, the first iron core generates a magnetic field so as to drive the first iron core and then drive the motor shaft 1 to rotate. The linear drive stator assembly 5 includes a second bobbin 51, a second coil wound on the second bobbin, and a second iron core 52 arranged in the second bobbin. The linear drive mover assembly 4 includes three magnetic rings 41, and the magnetic poles are NSN or SNS from left to right. After the second coil is energized, the magnetic poles of the second iron core 52 are changed by changing the direction of the second coil current, thereby changing the direction of the force between the second iron core 52 and the magnetic ring 41, and finally realizing the forward and backward movement of the motor shaft 1. The above technology for controlling the motor shaft 1 to rotate left and right and move forward and backward is prior art and will not be described in detail here.

[0035] The bearing 6 includes an outer ring 61 and an inner ring 62. A retaining space 611 is provided in the outer ring 61. The axial length of the retaining space 611 is greater than the axial length of the inner ring 62. The inner ring 62 is embedded with a ball 621. The inner ring 62 is sleeved on the motor shaft 1 and in rolling contact with the motor shaft 1 through the ball 621, and is installed in the retaining space 611. The motor shaft 1 is connected to the inner ring 62 of the bearing 6 and in rolling contact with the ball 621 on the inner ring 62. In this way, the motor shaft 1 can rotate left and right relative to the inner ring 62 through the ball 621, and can also move forward and backward relative to the inner ring 62. The motor shaft 1 is only subjected to rolling friction during the movement, and the movement resistance is smaller, which is conducive to improving the endurance and use experience of the electric toothbrush. Compared with the traditional elastic bearing 6 seat 8, the above structure is more stable and reliable to use, and has a longer service life. Since the axial length of the retaining space 611 of the outer ring 61 is greater than the axial length of the inner ring 62, thus, driven by the motor shaft 1, the inner ring 62 can not only rotate relative to the outer ring 61, but also move relative to the outer ring 61, and the movement of the inner ring 62 is smoother, further improving the use effect; in addition, since the axial length of the retaining space 611 is greater than the axial length of the inner ring 62, it has a larger installation space and is easy to be installed in the retaining space 611 during assembly, which reduces the axial processing size requirements of the outer ring 61 and reduces the manufacturing cost of the bearing 6.

[0036] In this embodiment, the difference between the axial length of the space 611 and the axial length of the inner ring 62 is maintained at 0.5mm-5mm. This arrangement ensures the rotation effect between the inner ring 62 and the outer ring 61 and reduces the manufacturing and assembly requirements of the bearing 6, while also controlling the axial size of the bearing 6 to avoid it occupying the internal space of the electric toothbrush.

[0037] In this embodiment, see Figure 3-Figure 4 The outer ring 61 is in a straight cylindrical shape, and the bearing 6 further includes a first end cover 63 and a second end cover 64, which are respectively covered at both ends of the outer ring 61. In this embodiment, the outer ring 61 is connected to the outer ring 61 in a detachable manner, which is convenient for later maintenance. The first end cover 63 and the second end cover 64 are both provided with a limiting structure 642 for limiting the inner ring 62 from sliding out, thereby limiting the inner ring 62 from sliding out of the outer ring 61.

[0038] Among them, both ends of the outer ring 61 are provided with a card slot 612, the first end cover 63 and the second end cover 64 both include an axially arranged plug-in portion 641 and a radially arranged limiting structure 642, the plug-in portion 641 is inserted into the card slot 612, which improves the assembly effect between the end cover and the outer ring 61, the plug-in portion 641 and the outer side wall of the outer ring 61 are coplanar, and the end cover will not protrude from the surface of the outer ring 61, which is convenient for later assembly and avoids interference.

[0039] In this embodiment, the motor shaft 1 is an integrally formed structure, that is, the part connected with the rotary drive rotor assembly 2 and the linear drive rotor assembly 4 is an integral structure, which improves the mechanical properties of the motor shaft 1. In addition, the integrated motor shaft 1 also eliminates the assembly steps such as the split type, which is beneficial to improving the assembly effect.

[0040] In this embodiment, there are six groups of coil windings 31 , and the six groups of coil windings 31 are evenly distributed along the outer circumference of the rotary drive mover assembly 2 .

[0041] Example 2

[0042] An electric toothbrush comprises a housing 7 and a motor assembly arranged in the housing 7. The motor assembly adopts the motor assembly described in Example 1.

[0043] Among them, see Figure 2 , Figure 5 The housing 7 is provided with a bearing 6 seat 8, which includes an integrated inner cylinder 81, an outer cylinder 82 and a plurality of connectors 83. The inner cylinder 81 and the outer cylinder 82 are connected by a plurality of connectors 83, and the space between two adjacent connectors 83 is hollowed out. The inner cylinder 81 is connected to the bearing 6, and the outer cylinder 82 is connected to the housing 7. The above bearing 6 seat 8, on the basis of realizing the assembly of the bearing 6, the bearing 6 seat 8 and the housing 7, the space between two adjacent connectors 83 is hollowed out, and this side is used for wiring inside the electric toothbrush.

[0044] The housing includes a split multi-section housing, preferably three sections in this embodiment. Since the electric toothbrush has a certain length, the housing 7 is set to a multi-section structure, which is convenient for processing and manufacturing. The adjacent two sections of the housing are welded and fixed, which improves the connection reliability of the housing 7.

[0045] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A motor assembly for an electric toothbrush, characterized in that: It includes a motor shaft, a rotary drive moving subassembly, a rotary drive stator assembly, a linear drive moving subassembly, a linear drive stator assembly and a bearing, wherein the rotary drive moving subassembly and the linear drive moving subassembly are fixed on the motor shaft, and the two drive the motor shaft to perform rotary motion and linear motion respectively under the action of the rotary drive stator assembly and the linear drive stator assembly; The bearing comprises an outer ring and an inner ring, wherein a retaining space is provided in the outer ring, and an axial length of the retaining space is greater than an axial length of the inner ring; the inner ring is embedded with balls, the inner ring is sleeved on the motor shaft and in rolling contact with the motor shaft through the balls, and is installed in the retaining space at the same time.

2. The motor assembly of the electric toothbrush according to claim 1, characterized in that: The difference between the axial length of the retaining space and the axial length of the inner ring is 0.5 mm to 5 mm.

3. The motor assembly of the electric toothbrush according to claim 1, characterized in that: The outer ring is in a straight cylindrical shape, and the bearing further comprises a first end cover and a second end cover, which are respectively covered at both ends of the outer ring and are both provided with a limiting structure for limiting the inner ring from sliding out.

4. The motor assembly of the electric toothbrush according to claim 3, characterized in that: Both ends of the outer ring are provided with card slots, and the first end cover and the second end cover both include an inserting portion arranged along the axial direction and the limiting structure arranged along the radial direction, the inserting portion is inserted into the card slot, and the outer side walls of the two are coplanar.

5. The motor assembly of the electric toothbrush according to claim 3, characterized in that: The first end cover and / or the second end cover are detachably connected to the outer ring.

6. The motor assembly of the electric toothbrush according to claim 1, characterized in that: The motor shaft is an integrally formed structure.

7. The motor assembly of the electric toothbrush according to claim 1, characterized in that: The rotary drive stator assembly includes six groups of coil windings, and the six groups of coil windings are evenly distributed along the outer circumference of the rotary drive mover assembly.

8. An electric toothbrush, comprising a housing and a motor assembly disposed in the housing, characterized in that: The motor assembly is the motor assembly according to any one of claims 1 to 7.

9. The electric toothbrush according to claim 8, characterized in that: A bearing seat is also provided in the outer shell, and the bearing seat includes an inner cylinder, an outer cylinder and a plurality of connecting parts. The inner cylinder and the outer cylinder are connected by the plurality of connecting parts, and the space between two adjacent connecting parts is hollow. The bearing is connected in the inner cylinder, and the outer cylinder is connected to the outer shell.

10. The electric toothbrush according to claim 8, characterized in that: The shell comprises a split multi-section shell, and two adjacent sections of the shell are welded and fixed.

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