Motor for electric toothbrush and electric toothbrush

Abstract

The utility model discloses a motor for an electric toothbrush and the electric toothbrush. The motor comprises a stator, a rotor, a detection assembly, a locking assembly, a first bearing and a second bearing, the detection assembly is used for detecting the rotation angle of the rotor, the detection assembly comprises a first detection piece and a second detection piece, the first detection piece and a stator shell are relatively fixed, the second detection piece and a rotor shaft are relatively fixed, and the locking assembly is used for locking the first bearing and the second bearing. The first bearing and the second bearing are used for rotatably connecting the rotor shaft and the stator shell, and the locking assembly abuts against the first bearing and / or the second bearing in the axial direction so as to lock the rotor shaft and the stator shell in the axial direction. According to the motor for the electric toothbrush provided by the invention, displacement of the detection piece caused by deformation or displacement of the rotor shaft can be avoided, and the detection accuracy is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of electric toothbrushes, and in particular to a motor for an electric toothbrush and an electric toothbrush. Background Art

[0002] Electric toothbrushes have obvious advantages over traditional manual toothbrushes in terms of functionality and user experience, such as better cleaning effects and more convenient use, and therefore are favored by more and more consumers.

[0003] The power component of an electric toothbrush usually uses an electric motor, also known as a motor. The motor usually has a rotor and a stator. The rotor and the stator rotate the stator through the principle of electromagnetic induction, thereby driving the brush head to rotate or vibrate. When it is necessary to detect the rotation angle of the rotor, a detection element can be set, but the detection element may be displaced due to external force, resulting in inaccurate detection. Utility Model Content

[0004] The present application discloses a motor for an electric toothbrush and an electric toothbrush, which can avoid displacement of a detection member due to deformation or displacement of a rotor shaft, thereby ensuring the accuracy of detecting the rotation angle of the rotor.

[0005] In order to achieve the above objectives, in a first aspect, the present application discloses a motor for an electric toothbrush, comprising:

[0006] The stator comprises a stator shell and a first electromagnetic induction member fixed in the stator shell;

[0007] A rotor, comprising a rotor shaft and a second electromagnetic induction member, wherein the rotor shaft is at least partially disposed in the stator housing, the second electromagnetic induction member is disposed on the rotor shaft, the first electromagnetic induction member is one of a coil winding and a permanent magnet, and the second electromagnetic induction member is the other of the coil winding and the permanent magnet;

[0008] A detection component, used to detect the rotation angle of the rotor, the detection component comprising a first detection member and a second detection member, the first detection member is relatively fixed to the stator housing, the second detection member is relatively fixed to the rotor shaft and corresponds to the position of the first detection member;

[0009] A first bearing and a second bearing are disposed between the rotor shaft and the stator housing, and are used to rotatably connect the rotor shaft to the stator housing, wherein the first bearing and the second bearing are respectively located on two axial sides of the second electromagnetic induction component;

[0010] A locking assembly is axially abutted against the first bearing and / or the second bearing to lock the rotor shaft and the stator housing in the axial direction.

[0011] The motor for an electric toothbrush provided in the embodiment of the present application fixes the rotor shaft in the radial direction by means of the first bearing and the second bearing, thereby preventing the rotor shaft from being radially offset relative to the stator housing due to the force on the rotating shaft. In addition, the first bearing and the second bearing are axially limited by setting a locking assembly to prevent the bearings from moving axially, so that the rotor shaft and the stator housing are locked axially. Thus, the rotor shaft is locked in both the radial and axial directions, which can prevent the relative position of the first detection member and the second detection member from changing due to deformation or displacement of the rotor shaft when it is subjected to force, thereby ensuring the accuracy of the detection of the rotor rotation angle.

[0012] In a possible implementation of the first aspect, the locking assembly includes:

[0013] A first locking member, fixed on the rotor shaft and axially abutting against the inner ring of the first bearing;

[0014] A second locking member, fixed on the rotor shaft and axially abutting against the inner ring of the second bearing;

[0015] The first locking member and the second locking member are located between the first bearing and the second bearing.

[0016] In a possible implementation of the first aspect, the locking assembly includes:

[0017] A first locking member, fixed on the rotor shaft and axially abutting against the inner ring of the first bearing;

[0018] The second locking member is fixed on the rotor shaft and is located on both sides of the first bearing in the axial direction together with the first locking member. The second locking member abuts against the inner ring of the first bearing in the axial direction.

[0019] In a possible implementation of the first aspect, the locking assembly further includes:

[0020] A first stopper, fixed relative to the stator housing, the first stopper abutting against an end surface of an outer ring of the first bearing away from the first locking member;

[0021] The second stop portion is fixed relative to the stator housing, and the second stop portion abuts against an end surface of an outer ring of the second bearing away from the second locking member.

[0022] In a possible implementation of the first aspect, a first bearing chamber is formed at the first end of the stator case, the first bearing is arranged in the first bearing chamber, a first through hole is opened on the end wall of the first bearing chamber, the first end of the rotor shaft passes through the first through hole, the aperture of the first through hole is larger than the inner ring diameter of the first bearing and smaller than the outer ring diameter of the first bearing, so that the end wall of the first bearing chamber forms the first stop portion; a second bearing chamber is formed at the second end of the stator case, the second bearing is arranged in the second bearing chamber, a second through hole is opened on the end wall of the second bearing chamber, the second end of the rotor shaft passes through the second through hole, the aperture of the second through hole is larger than the inner ring diameter of the second bearing and smaller than the outer ring diameter of the second bearing, so that the end wall of the second bearing chamber forms the second stop portion.

[0023] In a possible implementation of the first aspect, the stator housing includes:

[0024] A main housing, wherein the main housing is formed with a mounting cavity having one end closed and the other end open, the closed end of the main housing protrudes in a direction away from the mounting cavity to form a first protrusion, and a first bearing chamber for arranging a first bearing is formed in the first protrusion;

[0025] An end cover is arranged at the open end of the main shell, and the end cover protrudes in a direction away from the installation cavity to form a second protrusion, and a second bearing chamber for arranging a second bearing is formed in the second protrusion.

[0026] In a possible implementation manner of the first aspect, the outer ring of the first bearing is interference fit with the first bearing chamber, and the outer ring of the second bearing is interference fit with the second bearing chamber.

[0027] In a possible implementation manner of the first aspect, a wire passing hole is provided on the end cover, and the wire passing hole avoids the second protrusion.

[0028] In a possible implementation manner of the first aspect, an outer diameter of the second bearing is smaller than an outer diameter of the first bearing, and an outer diameter of the second protrusion is smaller than an outer diameter of the first protrusion.

[0029] In a possible implementation manner of the first aspect, a reinforcing plate is provided at the closed end of the main shell, and the reinforcing plate is sleeved on the first protrusion.

[0030] In a possible implementation of the first aspect, a connecting structure for connecting to a movement of the electric toothbrush is provided on the reinforcing plate.

[0031] In a possible implementation of the first aspect, the rotor shaft includes a first section and a second section, the diameter of the first section is larger than the diameter of the second section, the first section is used to connect the brush head of the electric toothbrush, the second section is arranged in the stator housing, and a portion of the first section is located in the stator housing and connected to the first bearing.

[0032] In a possible implementation of the first aspect, the open end of the main shell is provided with a limit step and a bending portion, the limit step and the bending portion are arranged at intervals along the axial direction, the edge of the end cover is clamped between the limit step and the bending portion, and the outer peripheral surface of the end cover is in contact with the inner wall surface of the main shell.

[0033] In a possible implementation manner of the first aspect, the motor further includes a base and a circuit board disposed on the base, and the base is connected to the open end of the main housing or the end cover.

[0034] In a possible implementation manner of the first aspect, the base is a hard part.

[0035] In a possible implementation manner of the first aspect, the surface roughness of the first locking member and the second locking member are both less than 12.5 μm to 50 μm.

[0036] In a possible implementation manner of the first aspect, the first detection member is a magnetic sensor, and the second detection member is a magnetic member; or the first detection member is a magnetic member, and the second detection member is a magnetic sensor.

[0037] In a possible implementation of the first aspect, the motor is a servo motor, and the servo motor includes a control circuit, and the control circuit is electrically connected to the detection component, and the control circuit is electrically connected to the rotor or the stator, and the control circuit is at least configured to: control the rotor to swing back and forth around the rotor shaft with a reference position as the center in a preset manner, and control the rotor to rotate around the rotor shaft to switch the reference position in a preset manner.

[0038] In a second aspect, the present application further discloses an electric toothbrush, comprising the motor described in any implementation manner in the first aspect.

[0039] The electric toothbrush provided in the embodiment of the present application adopts the motor described in any of the implementations of the first aspect, so that the displacement of the detection member caused by the deformation or displacement of the rotor shaft can be avoided, thereby ensuring the accuracy of the detection of the rotor rotation angle. This ensures that the brush head of the electric toothbrush can swing accurately and provide an efficient cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 is an exploded diagram of a motor provided in an embodiment of the present application;

[0042] Figure 2 is a cross-sectional view of a motor provided in an embodiment of the present application;

[0043] Figure 3 yes Figure 2 A magnified view of part A;

[0044] Figure 4 yes Figure 2 A magnified view of part B;

[0045] Figure 5 is a partial cross-sectional view of another cross-sectional surface of the motor provided in an embodiment of the present application;

[0046] Figure 6 yes Figure 5 Enlarged view of part C.

[0047] Description of reference numerals:

[0048] 100-stator; 110-stator housing; 111-first electromagnetic induction component; 120-main housing; 121-first protrusion; 122-first stopper; 1221-first through hole; 123-limiting step; 124-bending portion; 125-reinforcement plate; 130-end cover; 131-second protrusion; 132-second stopper; 1321-second through hole; 133-through hole;

[0049] 200- rotor; 210- rotor shaft; 210a- first section; 210b- second section; 211- first end; 212- second end; 220- second electromagnetic induction element;

[0050] 300-detection component; 310-first detection member; 320-second detection member;

[0051] 400-first bearing;

[0052] 500-second bearing;

[0053] 610-first locking member; 620-second locking member;

[0054] 700-base;

[0055] 800-Circuit Board. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] In this application, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0059] An electric toothbrush is a toothbrush that generates high-frequency vibrations by driving the brush head through the rapid rotation or vibration of the motor core. This high-frequency vibration can break down the toothpaste into fine foam and deeply clean the gaps between teeth. At the same time, the vibration of the bristles can promote blood circulation in the oral cavity and have a massage effect on the gum tissue. Electric toothbrushes generally include rotary electric toothbrushes and vibrating electric toothbrushes. Among them, rotary electric toothbrushes drive the brush head to rotate through the motor to enhance the friction effect. The brush head of a vibrating electric toothbrush can swing at a high frequency, thereby effectively cleaning the blind spots in the oral cavity.

[0060] An electric toothbrush mainly includes a battery, a motor, a brush head, and a movement, among which the motor is the power component of the electric toothbrush. It provides power for the toothbrush, and the rotor shaft of the motor is connected to the brush head to drive the brush head to rotate or vibrate. The principle of the motor is to realize the conversion of electrical energy and mechanical energy through electromagnetic induction. In a vibrating electric toothbrush, a position detection element can be used to detect the position information of the rotor, so that the control circuit can accurately control the rotation direction and speed of the motor, thereby realizing the precise swing of the brush head and providing an efficient cleaning effect. However, since a part of the position detection element is arranged on the rotor shaft, when the brush head is subjected to force, the rotor shaft will cause the inner rotor to shift or deform relative to the stator shell, and when the rotor shaft shifts or deforms, it will cause the position detection element fixedly connected to the rotor shaft to shift, resulting in inaccurate detection.

[0061] In view of this, the embodiments of the present application provide a motor for an electric toothbrush and an electric toothbrush, which can prevent the position detection element from shifting and improve the detection accuracy.

[0062] The motor and the electric toothbrush for the electric toothbrush are described in detail below through specific embodiments:

[0063] In a first aspect, the present application provides a motor for an electric toothbrush, such as Figure 1 to Figure 3 As shown, the motor includes a stator 100, a rotor 200 and a detection assembly 300, wherein the stator 100 includes a stator housing 110 and a first electromagnetic induction member 111 fixed in the stator housing 110; the rotor 200 includes a rotor shaft 210 and a second electromagnetic induction member 220 fixed to the rotor shaft 210, and the rotor shaft 210 is rotatably connected to the stator housing 110, so that the rotor shaft 210 can rotate relative to the stator housing 110. The detection assembly 300 can be used to detect the position or rotation angle of the rotor, and the detection assembly 300 may include a first detection member 310 and a second detection member 320, wherein the first detection member 310 is relatively fixed to the stator housing 110, and the second detection member 320 is relatively fixed to the rotor shaft 210.

[0064] It should be noted that the first electromagnetic induction component 111 can be one of a coil winding and a permanent magnet, and the second electromagnetic induction component 220 can be the other of a coil winding and a permanent magnet. It can be set specifically according to the type of motor. For example, when the motor is a brushed motor, since the brushed motor uses brushes and commutators to alternately change the direction of the electromagnetic field, the motor rotor rotates. Therefore, the first electromagnetic induction component 111 relatively fixed to the stator housing 110 in the brushed motor can be a permanent magnet, and the second electromagnetic induction component 220 relatively fixed to the rotor shaft 210 can be a coil winding, and the brush is in contact with the coil winding and conducts electricity. The current can enter the coil through the brush, so that the coil generates a magnetic field, and the magnetic field interacts with the permanent magnet inside the stator housing 110, thereby driving the rotor to rotate. For another example, when the motor is a brushless motor, the brushless motor does not use brushes, but uses an electronic commutator to detect the position of the motor rotor and control the flow direction of the current, thereby realizing the rotation of the rotor. Therefore, the first electromagnetic induction member 111 fixed relative to the stator housing 110 in the brushless motor can be a coil winding, and the second electromagnetic induction member 220 fixed relative to the rotor shaft 210 can be a permanent magnet. When current passes through the coil winding on the stator, a magnetic field is generated, and the magnetic field interacts with the permanent magnet on the rotor, thereby driving the rotor to rotate.

[0065] In order to accurately control the rotation mode of the rotor, the above-mentioned motor can also use a servo motor. The main working principle of the servo motor is to achieve efficient and stable brushing based on a precise control and feedback system. In addition to the above components, the servo motor also includes a control circuit, which is electrically connected to the detection component 300 and electrically connected to the rotor 200 or the stator 100. The general process of its operation is as follows: when the user starts the electric toothbrush, the control circuit sends a start signal to the servo motor and supplies power to the servo motor. After receiving the start signal, the servo motor starts to run and converts electrical energy into mechanical energy, thereby generating a torque to drive the rotor 200 and the brush head to rotate. The detection component 300 can feedback the position and / or speed information of the rotor 200 in real time, and feed this information back to the control circuit. The control circuit compares this information with the target position and / or speed of the rotor 200, and then adjusts the speed or direction of the rotor 200 to ensure that the brush head can accurately move according to the preset parameters, so as to achieve the best cleaning effect.

[0066] In a possible implementation, the control circuit can control the rotor 200 to swing back and forth (i.e., vibrate) around the rotor shaft 210 with the reference position as the center in a preset manner. Since the rotor 200 is connected to the brush head, the rotor 200 can drive the brush head to swing back and forth with the reference position as the center when swinging back and forth, so that the brush head cleans the oral cavity in a high-frequency vibration manner. At the same time, in order to cover a wider cleaning area without changing the overall position of the electric toothbrush, the control circuit can also control the rotor 200 to rotate around the rotor shaft 210 and switch to different reference positions. So that the brush head can swing back and forth with different reference positions as the center. For example, at the first moment, the rotor 200 is located at the first reference position, and the control circuit can control the rotor 200 and the brush head to swing back and forth to both sides of the first reference position with the first reference position as the center to achieve high-frequency vibration. After the brush head has been oscillating back and forth at the first reference position for a preset period of time, the control circuit controls the rotor 200 to rotate circumferentially around the rotor shaft 210 to the second reference position. At this time, the control circuit controls the rotor 200 and the brush head to reciprocate on both sides of the second reference position with the second reference position as the center to achieve high-frequency vibration. After the brush head has been running at the second reference position for a preset period of time, the control circuit can continue to control the rotor 200 to switch to the next reference position. In this reciprocating manner, the vibration of the brush head at multiple different reference positions is achieved, thereby expanding the cleaning range and improving the cleaning effect while the user's holding posture remains unchanged.

[0067] It should be noted that the reciprocating swing and rotation of the rotor 200 are both rotational motions around the rotor shaft 210. The swing is mainly for achieving vibration of the brush head, while the rotation is mainly for adjusting the reference position of the brush head during vibration.

[0068] The detection component 300 can be implemented by a magnetic sensor. For example, the first detection member 310 can be a magnetic sensor, and the second detection member 320 can be a magnetic member. Alternatively, the first detection member 310 can be a magnetic member, and the second detection member 320 can be a magnetic sensor. The magnetic sensor can detect its relative position with the magnetic member, thereby realizing the detection of the position or rotation angle of the rotor. Specifically, the magnetic sensor can be implemented by a Hall sensor based on the Hall effect.

[0069] When the brush head is subjected to force, in order to prevent the rotor shaft 210 from shifting or deforming, as shown in FIG. Figure 3 , Figure 4As shown, a first bearing 400 and a second bearing 500 may be provided between the rotor shaft 210 and the stator housing 110, and the first bearing 400 and the second bearing 500 are respectively located on both sides of the axial direction of the second electromagnetic induction member 220 to rotatably connect the rotor shaft 210 to the stator housing 110. Thus, the two bearings can fix the rotor shaft 210 in the radial direction, thereby avoiding the situation where the rotor shaft 210 is radially offset relative to the stator housing 110 due to the force on the rotating shaft, and ensuring the accuracy of position detection. Among them, the inner ring of the first bearing 400 and the inner ring of the second bearing 500 are both fixedly matched with the rotor shaft 210, and the outer ring of the first bearing 400 and the outer ring of the second bearing 500 are both fixedly matched with the stator housing 110.

[0070] In addition, a locking assembly may be provided, which is used to abut against the first bearing 400 and / or the second bearing 500 in the axial direction to lock the rotor shaft 210 and the stator housing 110 in the axial direction. In this way, the bearings can be prevented from moving in the axial direction, the stability of the first bearing 400 and the second bearing 500 supporting the rotor shaft 210 is ensured, and the possibility of inaccurate detection by the detection assembly 300 due to deformation of the rotor shaft 210 is reduced.

[0071] There are many ways to implement the locking assembly. In one possible implementation of the locking assembly, the locking assembly includes a first locking member and a second locking member, wherein the first locking member is fixed on the rotor shaft 210 and abuts against the inner ring of the first bearing 400 in the axial direction; the second locking member is fixed on the rotor shaft 210 and is located on both sides of the axial direction of the first bearing 400 with the first locking member, and the second locking member also abuts against the inner ring of the first bearing 400 in the axial direction. Thus, the first locking member and the second locking member can form axial limits on both sides of the inner ring of the first bearing 400 respectively to lock the axial position of the inner ring of the first bearing 400. Similarly, locking members can also be provided on both sides of the axial direction of the second bearing 500, respectively abutting against the inner ring of the second bearing 500, to lock the axial position of the inner ring of the second bearing 500.

[0072] In another possible implementation of the locking assembly, Figure 1 , Figure 3 , Figure 4As shown, the first locking member 610 is fixed on the rotor shaft 210 and abuts against the inner ring of the first bearing 400 in the axial direction; the second locking member 620 is fixed on the rotor shaft 210 and abuts against the inner ring of the second bearing 500 in the axial direction; and the first locking member 610 and the second locking member 620 are both located between the first bearing 400 and the second bearing 500. Therefore, the first locking member 610 can prevent the inner ring of the first bearing 400 from axially moving toward the second bearing 500, and the second locking member 620 can prevent the inner ring of the second bearing 500 from axially moving toward the first bearing 400, so that the distance between the first bearing 400 and the second bearing 500 remains unchanged, ensuring the stability of the first bearing 400 and the second bearing 500 supporting the rotor shaft 210.

[0073] Specifically, the first locking member 610 and the second locking member 620 may be sleeved on the rotor shaft 210 and have an interference fit with the rotor shaft 210. In addition, the first locking member 610 and the second locking member 620 may also be threadedly fitted with the rotor shaft 210, for example, by a locking nut.

[0074] In order to reduce the friction between the first locking member 610 and the second locking member 620 and the inner ring of the bearing, the first locking member 610 and the second locking member 620 can be made of a material with a relatively small surface roughness, such as copper, stainless steel and other metal materials. Specifically, a material with a surface roughness of less than 12.5 μm to 50 μm can be selected. In this way, the friction between the first locking member 610 and the second locking member 620 and the inner ring of the bearing can be reduced, and energy loss can be reduced.

[0075] In addition to providing axial limit to the inner ring of the bearing, the locking assembly can also provide axial limit to the outer ring of the bearing. Figure 3 , Figure 4 As shown, the locking assembly further includes a first stopper 122 and a second stopper 132, wherein the first stopper 122 is fixed relative to the stator housing 110 and abuts against the end surface of the outer ring of the first bearing 400 away from the first locking member 610. The second stopper 132 is fixed relative to the stator housing 110 and abuts against the end surface of the outer ring of the second bearing 500 away from the second locking member 620. Thus, the first stopper 122 cooperates with the first locking member 610 to lock the axial position of the first bearing 400; the second stopper 132 cooperates with the second locking member 620 to lock the axial position of the second bearing 500. Thereby, the axial positions of the first bearing 400 and the second bearing 500 are fixed, and the axial movement of the first bearing 400 and the second bearing 500 can be avoided, thereby ensuring the stability of the first bearing 400 and the second bearing 500 in supporting the rotor shaft 210, and reducing the possibility of inaccurate detection of the detection component 300 due to deformation of the rotor shaft 210.

[0076] There are many ways to implement the first stopper 122 and the second stopper 132. For example, a stopper may be installed on the inner wall of the stator housing 110 to limit the outer ring of the bearing. In addition, a first bearing 400 chamber may be formed at the first end 211 of the stator housing 110, and the first bearing 400 is disposed in the first bearing 400 chamber. Figure 4 As shown, the end wall of the first bearing 400 chamber is provided with a first through hole 1221, and the first end 211 of the rotor shaft 210 passes through the first through hole 1221. The aperture of the first through hole 1221 is larger than the inner ring diameter of the first bearing 400 and smaller than the outer ring diameter of the first bearing 400, so that the end wall of the first bearing 400 chamber forms the first stopper 122. Correspondingly, the second end 212 of the stator housing 110 forms a second bearing 500 chamber, and the second bearing 500 is disposed in the second bearing 500 chamber, as shown in FIG. Figure 3 As shown, the end wall of the second bearing 500 chamber is provided with a second through hole 1321, and the second end 212 of the rotor shaft 210 passes through the second through hole 1321. The aperture of the second through hole 1321 is larger than the inner ring diameter of the second bearing 500 and smaller than the outer ring diameter of the second bearing 500, so that the end wall of the second bearing 500 chamber forms the second stopper 132. Thus, the first stopper 122 and the second stopper 132 are both integrally formed with the stator housing 110, the structure is more stable, and the stopper can be avoided from being installed separately, which reduces the difficulty of assembly.

[0077] Specifically, the structure of the stator housing 110 may be as follows: Figure 2 , Figure 3 , Figure 4 As shown, the main housing 120 and the end cover 130 are included, wherein the main housing 120 is formed with a mounting cavity with one end closed and the other end open, the closed end of the main housing 120 protrudes in a direction away from the mounting cavity to form a first protrusion 121, and a first bearing 400 chamber for arranging the first bearing 400 is formed in the first protrusion 121. The end cover 130 is arranged at the open end of the main housing 120, and the end cover 130 protrudes in a direction away from the mounting cavity to form a second protrusion 131, and a second bearing 500 chamber for arranging the second bearing 500 is formed in the second protrusion 131. Since the second end 212 of the rotor shaft 210 is arranged through the end wall of the second bearing 500 chamber, and the second end 212 of the rotor shaft 210 is used to connect the brush head, therefore, the structure can make the bearing in the second bearing 500 chamber as close to the brush head as possible, so that the cantilever of the rotor shaft 210 extending out of the stator housing 110 is shorter, so that the deformation amount when subjected to force is small, and the interference with position detection is reduced.

[0078] When installing the first bearing 400 and the second bearing 500, the outer ring of the first bearing 400 can be interference fit with the inner wall of the chamber of the first bearing 400, and the outer ring of the second bearing 500 can be interference fit with the inner wall of the chamber of the second bearing 500. In this way, the first bearing 400 and the second bearing 500 can be further prevented from axial movement, reducing interference with position detection.

[0079] In order to supply power to the coil winding, the coil winding has an outlet terminal, to which a lead wire is connected, and the lead wire can be used to connect to a power supply circuit. Figure 3 As shown, the end cover 130 is provided with a wire hole 133 for the wire to pass through, and the wire hole 133 is arranged to avoid the second protrusion 131, thereby avoiding affecting the assembly of the second bearing 500 chamber and the second bearing 500.

[0080] Furthermore, in order to have enough space for setting the wire hole 133, the outer diameter of the second bearing 500 can be set to be smaller than the outer diameter of the first bearing 400, so that the outer diameter of the second protrusion 131 can be smaller than the outer diameter of the first protrusion 121. In this way, the radial dimension of the second protrusion 131 is reduced, so that there is enough space on the end cover 130 to set the wire hole 133.

[0081] The connection structure between the main housing 120 and the end cover 130 can be implemented in a variety of ways. For example, the main housing 120 and the end cover 130 can be connected by fasteners such as screws and pins, or by bonding. In a possible implementation, Figure 5 , Figure 6 As shown, the open end of the main housing 120 is provided with a limiting step 123 and a bending portion 124, the limiting step 123 and the bending portion 124 are arranged at intervals along the axial direction, the edge of the end cover 130 is clamped between the limiting step 123 and the bending portion 124, and the outer peripheral surface of the end cover 130 is in contact with the inner wall surface of the main housing 120. Thus, the limiting step 123 and the bending portion 124 limit the axial degree of freedom of the end cover 130, and the inner wall surface of the main housing 120 limits the radial degree of freedom of the end cover 130, so that the end cover 130 can be stably installed on the open end of the main housing 120 without the use of additional fasteners. The installation structure is simple and saves parts.

[0082] Specifically, in order to form the bent portion 124 , the side wall of the open end of the main shell 120 may be partially grooved and then bent toward the inner side of the main shell 120 , and the manufacturing process is simple.

[0083] like Figure 3As shown, the motor also includes a base 700 and a circuit board 800 arranged on the base 700. The base 700 can be a hard part and is connected to one end of the stator shell 110 close to the end cover 130. The circuit board 800 can be arranged at intervals with the end of the extended section of the rotor shaft 210. The magnetic sensor can be arranged on the surface of the circuit board 800 facing the magnetic part. For example, the base 700 can be connected to the open end of the main housing 120 or the end cover 130 of the stator shell 110. Thus, the hard base 700 can provide sufficient strength support for the circuit board 800, and the base 700 and the stator shell 110 are connected to form a whole. When the rotor shaft 210 is subjected to the force of brushing teeth and drives the electric toothbrush to deform, the electric toothbrush as a whole deforms synchronously, which can avoid the relative position of the first detection member 310 and the second detection member 320 changing due to inconsistent deformation, thereby causing inaccurate detection.

[0084] like Figure 4 As shown, the closed end of the main housing 120 is further provided with a reinforcing plate 125, which is sleeved on the outer periphery of the first protrusion 121. Since the first protrusion 121 is close to the brush head, the force exerted on the user when brushing teeth is stronger, so the reinforcing plate 125 can structurally reinforce the closed end of the main housing 120 to prevent the first bearing 400 from shifting due to the deformation of the closed end of the main housing 120 under force.

[0085] In order to facilitate the connection with the core of the electric toothbrush, a connection structure for connecting the core is also provided on the reinforcing plate 125. Specifically, the connection structure can be one or more of structures such as a threaded hole, a clamping protrusion or a clamping groove.

[0086] The structure of the rotor shaft 210 can be implemented in many ways, for example, a shaft structure in which each part has an equal diameter can be used. Figure 1 The structure shown, i.e., the rotor shaft 210 includes a first section 210a and a second section 210b arranged in the axial direction, wherein the diameter of the first section 210a is greater than the diameter of the second section 210b, the first section 210a is used to connect the brush head of the electric toothbrush, the second section 210b is arranged in the stator housing 110, and a part of the first section 210a is located in the stator housing 110 and connected to the first bearing 400. Since the first section 210a is used to connect the brush head of the electric toothbrush, it is subjected to a large force, so setting the diameter of the first section 210a larger can make it more resistant to deformation, thereby effectively preventing the second detection member 320 from shifting and ensuring the accuracy of position detection.

[0087] In a second aspect, an embodiment of the present application further provides an electric toothbrush comprising the motor described in any of the above embodiments.

[0088] The electric toothbrush provided in the embodiment of the present application adopts the motor described in any of the above embodiments, so it can avoid the rotor shaft 210 being offset axially or radially relative to the stator due to the force on the rotating shaft, so that the first detection member 310 and the second detection member 320 are relatively displaced, thereby causing inaccurate detection. This ensures that the brush head of the electric toothbrush can swing accurately and provide an efficient cleaning effect.

[0089] It should be noted that in addition to the above-mentioned motor, the electric toothbrush also includes components such as a battery, a brush head, and a movement. The battery is electrically connected to the motor to provide electrical energy to the motor; the brush head is connected to the rotor shaft of the motor, and the motor is used to convert electrical energy into mechanical energy and drive the brush head to swing or rotate. The movement is equipped with a circuit board to control the movement of the brush head and realize other additional functions of the electric toothbrush (such as speed regulation, timing, etc.).

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A motor for an electric toothbrush, characterized in that: include: The stator comprises a stator shell and a first electromagnetic induction member fixed in the stator shell; A rotor, comprising a rotor shaft and a second electromagnetic induction member, wherein the rotor shaft is at least partially disposed in the stator housing, the second electromagnetic induction member is disposed on the rotor shaft, the first electromagnetic induction member is one of a coil winding and a permanent magnet, and the second electromagnetic induction member is the other of the coil winding and the permanent magnet; A detection component, used to detect the rotation angle of the rotor, the detection component comprising a first detection member and a second detection member, the first detection member is relatively fixed to the stator housing, the second detection member is relatively fixed to the rotor shaft and corresponds to the position of the first detection member; A first bearing and a second bearing, disposed between the rotor shaft and the stator housing, for rotatably connecting the rotor shaft to the stator housing, the first bearing and the second bearing being located at two axial sides of the second electromagnetic induction element, respectively; A locking assembly is axially abutted against the first bearing and / or the second bearing to lock the rotor shaft and the stator housing in the axial direction.

2. The motor according to claim 1, characterized in that The locking assembly comprises: A first locking member, fixed on the rotor shaft and axially abutting against the inner ring of the first bearing; A second locking member, fixed on the rotor shaft and axially abutting against the inner ring of the second bearing; The first locking member and the second locking member are located between the first bearing and the second bearing.

3. The motor according to claim 1, characterized in that The locking assembly comprises: A first locking member, fixed on the rotor shaft and axially abutting against the inner ring of the first bearing; The second locking member is fixed on the rotor shaft and is located on both sides of the first bearing in the axial direction together with the first locking member. The second locking member abuts against the inner ring of the first bearing in the axial direction.

4. The motor according to claim 2, characterized in that The locking assembly also includes: A first stopper, fixed relative to the stator housing, the first stopper abutting against an end surface of an outer ring of the first bearing away from the first locking member; The second stop portion is fixed relative to the stator housing, and the second stop portion abuts against an end surface of an outer ring of the second bearing away from the second locking member.

5. The motor according to claim 4, characterized in that A first bearing chamber is formed at the first end of the stator housing, the first bearing is disposed in the first bearing chamber, a first through hole is formed on the end wall of the first bearing chamber, the first end of the rotor shaft passes through the first through hole, and the aperture of the first through hole is larger than the inner ring diameter of the first bearing and smaller than the outer ring diameter of the first bearing, so that the end wall of the first bearing chamber forms the first stopper; A second bearing chamber is formed at the second end of the stator housing, the second bearing is arranged in the second bearing chamber, a second through hole is opened on the end wall of the second bearing chamber, the second end of the rotor shaft passes through the second through hole, and the aperture of the second through hole is larger than the inner ring diameter of the second bearing and smaller than the outer ring diameter of the second bearing, so that the end wall of the second bearing chamber forms the second stop portion.

6. The motor according to claim 1, characterized in that The stator housing comprises: A main housing, wherein the main housing is formed with a mounting cavity having one end closed and the other end open, the closed end of the main housing protrudes in a direction away from the mounting cavity to form a first protrusion, and a first bearing chamber for arranging a first bearing is formed in the first protrusion; An end cover is arranged at the open end of the main shell, and the end cover protrudes in a direction away from the installation cavity to form a second protrusion, and a second bearing chamber for arranging a second bearing is formed in the second protrusion.

7. The motor according to claim 6, characterized in that The outer ring of the first bearing is interference fit with the first bearing chamber, and the outer ring of the second bearing is interference fit with the second bearing chamber.

8. The motor according to claim 7, characterized in that The end cover is provided with a wire passing hole, and the wire passing hole avoids the second protrusion.

9. The motor according to claim 8, characterized in that The outer diameter of the second bearing is smaller than the outer diameter of the first bearing, and the outer diameter of the second protrusion is smaller than the outer diameter of the first protrusion.

10. The motor according to claim 6, characterized in that A reinforcing plate is provided at the closed end of the main shell, and the reinforcing plate is sleeved on the first protrusion.

11. The motor according to claim 10, characterized in that The reinforcing plate is provided with a connecting structure for connecting to the core of the electric toothbrush.

12. The motor according to any one of claims 1 to 11, characterized in that: The rotor shaft includes a first section and a second section, the diameter of the first section is larger than the diameter of the second section, the first section is used to connect the brush head of the electric toothbrush, the second section is arranged in the stator housing, and a part of the first section is located in the stator housing and connected to the first bearing.

13. The motor according to any one of claims 6 to 11, characterized in that: The open end of the main shell is provided with a limiting step and a bending portion, the limiting step and the bending portion are arranged at intervals along the axial direction, the edge of the end cover is clamped between the limiting step and the bending portion, and the outer peripheral surface of the end cover is in contact with the inner wall surface of the main shell.

14. The motor according to any one of claims 6 to 11, characterized in that: The motor further comprises a base and a circuit board arranged on the base, and the base is connected to the open end of the main housing or the end cover.

15. The motor according to claim 14, characterized in that The base is a hard part.

16. The motor according to any one of claims 2 to 5, characterized in that: The surface roughness of the first locking member and the second locking member is less than 12.5 μm to 50 μm.

17. The motor according to any one of claims 1 to 11, characterized in that: The first detection member is a magnetic sensor, and the second detection member is a magnetic member; or the first detection member is a magnetic member, and the second detection member is a magnetic sensor.

18. The motor according to any one of claims 1 to 11, characterized in that: The motor is a servo motor, which includes a control circuit, which is electrically connected to the detection component and to the rotor or the stator. The control circuit is at least configured to: control the rotor to oscillate back and forth around the rotor shaft with a reference position as the center in a preset manner, and control the rotor to rotate around the rotor shaft to switch the reference position in a preset manner.

19. An electric toothbrush, characterized in that: A motor comprising any one of claims 1 to 18.

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