Elastic piece, motor and electric toothbrush

Abstract

The utility model relates to the technical field of motors, in particular to an elastic piece, a motor and an electric toothbrush, which comprises an inner connecting sleeve, an outer connecting sleeve and an inner connecting sleeve, the outer connecting sleeve is located on the periphery of the inner connecting sleeve and used for being connected with a motor shell; the flexible connecting part is connected between the inner connecting sleeve and the outer connecting sleeve, and the flexible connecting part can generate elastic deformation, so that the inner connecting sleeve and the outer connecting sleeve at least can generate relative displacement in the axial direction of the inner connecting sleeve. The flexible connecting part is arranged between the inner connecting sleeve and the outer connecting sleeve, and the structure is simple. The flexible connecting part can generate elastic deformation, so that the inner connecting sleeve and the outer connecting sleeve at least can generate relative displacement in the axial direction of the inner connecting sleeve, the inner connecting sleeve can swing at a large angle along with the bearing and move in the axial direction, the motor shaft is assisted to move front and back, vibration of the motor is reduced, and axial front and back movement of the motor shaft is stabilized.

Description

Technical Field

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

[0002] Electric toothbrushes use the rapid rotation or vibration of the motor core to produce high-frequency vibrations in the brush head, instantly breaking down the toothpaste into fine foam and deeply cleaning the gaps between teeth. At the same time, the vibration of the bristles can promote blood circulation in the mouth and have a massage effect on the gum tissue.

[0003] In order to improve the cleaning effect on teeth, some electric toothbrush heads can move along the axial direction. For this reason, elastic parts need to be set in the motor of the electric toothbrush to assist the motor shaft to move along the axial direction, so as to reduce the vibration of the motor and coordinate the stability of the movement. However, the existing elastic parts have a complex structure and the effect of vibration reduction, that is, the effect of stabilizing the movement, is poor, resulting in a very bad user experience. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide an elastic member, a motor and an electric toothbrush, aiming to solve the problem that the existing elastic member has a relatively complex structure and a relatively poor vibration reduction effect. An elastic member comprises:

[0005] The inner connecting sleeve has an axially penetrating center hole, and a mounting position for mounting a motor bearing is arranged in the center hole;

[0006] An outer connecting sleeve, located outside the inner connecting sleeve and used for connecting with the motor housing;

[0007] The flexible connection part is connected between the inner connection sleeve and the outer connection sleeve, and the flexible connection part can produce elastic deformation so that the inner connection sleeve and the outer connection sleeve can produce relative displacement at least along the axial direction of the inner connection sleeve.

[0008] The elastic member has a simple overall structure by providing a flexible connection portion between the inner connection sleeve and the outer connection sleeve. The flexible connection portion can produce elastic deformation. When the bearing is set in the installation position, the flexible connection portion allows the inner connection sleeve and the bearing to produce axial displacement relative to the outer connection sleeve, so that the elastic member can assist the motor shaft to move forward and backward along the axial direction, which is beneficial to reducing the vibration of the motor and stabilizing the axial forward and backward movement of the motor shaft.

[0009] Optionally, the elastic member further includes a first connection portion and a second connection portion, and radial gaps are respectively formed between the flexible connection portion and the inner connection sleeve and the outer connection sleeve, and the flexible connection portion is connected to the outer wall of the inner connection sleeve through the first connection portion, and the flexible connection portion is connected to the inner wall of the outer connection sleeve through the second connection portion. The gaps between the flexible connection portion and the inner connection sleeve and the outer connection sleeve can avoid interference between the flexible connection portion and the inner connection sleeve and the outer connection sleeve during displacement, which is conducive to the smooth relative displacement of the inner connection sleeve relative to the outer connection sleeve through the flexible connection portion, thereby improving the deformation reliability of the elastic member. The provision of the first connection portion and the second connection portion can improve the connection strength between the flexible connection portion and the inner connection sleeve and the outer connection sleeve while maintaining deformation reliability.

[0010] Optionally, the first connection part and the second connection part are staggered along the circumference of the flexible connection part, which can avoid the elastic part being damaged and ineffective due to excessive concentration of force caused by the first connection part and the second connection part being arranged in a straight line along the radial direction of the flexible connection part, thereby improving the deformation capacity of the elastic part.

[0011] Optionally, the first connection parts are at least one pair arranged opposite to each other, and / or the second connection parts are at least one pair arranged opposite to each other. That is, the first connection parts are at least one pair arranged opposite to each other along the circumference of the flexible connection part, and / or the second connection parts are at least one pair arranged opposite to each other along the circumference of the flexible connection part. On the one hand, the connection strength between the outer connection sleeve and the inner connection sleeve and the flexible connection part can be improved, and on the other hand, the deformation capacity of the flexible connection part will not be limited.

[0012] Optionally, the thickness of the end of the second connection part close to the outer connection sleeve is greater than the thickness of the end of the flexible connection part of the second connection part. The thickness of the second connection part along the axial direction of the flexible connection part gradually increases from the inside to the outside. This is beneficial to strengthen the overall strength of the flexible connection part and the outer connection sleeve. At the same time, the thinner end is connected to the flexible connection part, which further facilitates the deformation of the flexible connection part, improves the deformation capacity of the flexible connection part, and improves the overall reliability of the elastic member.

[0013] Optionally, of the two end faces of the second connection portion along the axial direction of the flexible connection portion, the inclination of one end face is greater than the inclination of the other end face. When the end face of the second connection portion with a greater inclination is subjected to a force along the axial direction of the motor shaft, it is easier to deform, and the axial movement of the inner connection sleeve relative to the outer connection sleeve is more coordinated, so that when the bearing moves axially with the motor shaft, the vibration reduction effect of the inner connection sleeve is better, and the vibration reduction effect of the elastic member as a whole is better.

[0014] Optionally, at least part of the flexible connection portion along the circumferential direction is wavy. That is, the flexible connection portion is in a high-low undulating structure that undulates along the axial direction. That is, the flexible connection portion is in a high-low undulating structure along the circumferential direction, and the undulating direction of the flexible connection portion is along the axial direction. The elasticity and elastic deformation capacity of the flexible connection portion can be improved, thereby improving the vibration reduction effect of the elastic member.

[0015] Optionally, the flexible connection part has a hollow structure. The hollow structure can improve the elasticity and deformation capacity of the flexible connection part, thereby improving the vibration reduction effect of the elastic member.

[0016] Optionally, at least part of the flexible connection portion is a spring or a spring sheet, and a plurality of springs or spring sheets are arranged at intervals along the circumferential direction. The spring and spring sheet have low cost, good elasticity, and strong deformation ability. The spring, spring sheet, and other rubber parts of the elastic member can be fixed by injection molding, which can reduce costs and improve the vibration reduction effect of the elastic member.

[0017] Optionally, the flexible connection part is a plurality of springs arranged radially along the outer connection sleeve and arranged at intervals along the circumference of the outer connection sleeve, the outer end of the spring along the radial direction of the outer connection sleeve is connected to the outer connection sleeve, and the inner end along the radial direction of the outer connection sleeve is connected to the inner connection sleeve. The spring is arranged radially and connected between the outer connection sleeve and the inner connection sleeve, which has a simple structure and low cost, and can make the flexible connection part have strong shape ability and improve the vibration reduction effect of the elastic member. The plurality of springs are arranged at intervals along the circumference of the outer connection sleeve, which not only improves the connection strength between the outer connection sleeve and the inner connection sleeve, but also improves the deformation ability of the elastic member, thereby improving the vibration reduction effect of the elastic member.

[0018] Optionally, the flexible connection part is a conical coil spring coaxially arranged with the inner connection sleeve, the large diameter end of the conical coil spring is connected to the outer connection sleeve, and the small diameter end outer sleeve is connected to the inner connection sleeve. The conical coil spring is a spring whose axial diameter gradually increases or decreases, and has good strength. As the degree of deformation increases, the number of conical coil springs participating in the work will become less and less, and the spring index will also develop in a smaller direction, which makes the conical coil spring harder and harder, thereby preventing the conical coil spring from further deformation and playing a role in stabilizing the movement of the motor shaft.

[0019] Optionally, the inner connecting sleeve fixes the circuit board used to control the rotation angle of the motor, and the deformation displacement part of the inner connecting sleeve can drive the circuit board to move together. A magnetic part is arranged on the motor shaft, and the sensor on the circuit board realizes the control of the electric toothbrush at a large circumferential angle by detecting the magnetic part, and the large angle range is between 10° and 60° of swing. When the motor has axial displacement movement and the above-mentioned circumferential rotation, the circuit board with the sensor is arranged on the elastic part. When the axial movement of the motor shaft drives the deformation of the elastic part, the circuit board will move axially with the motor shaft. Since the magnetic part is fixed on the motor shaft, that is, the circuit board and the magnetic part move axially with the motor shaft, the relative distance between the circuit board with the sensor and the magnetic part remains unchanged, so that the elastic part can realize the toothbrush motor and the electric toothbrush with axial movement and large circumferential angle control at the same time. The elastic part prevents the distance between the circuit board with the sensor and the magnetic part from changing, and further avoids the failure of the large circumferential angle control function of the motor with axial movement.

[0020] Optionally, a first end of the inner connecting sleeve along the axial direction is provided with a coupling portion, and the coupling portion is used to connect the circuit board. The coupling portion can connect and fix the circuit board, so that the circuit board and the bearing are relatively fixed.

[0021] Optionally, the coupling portion includes a first clip arranged along the circumferential direction, the first clip includes a first hook folded outward, and the first hook and the side wall surface of the inner connecting sleeve are used to fix the circuit board. The structure of the first hook is simple and easy to process, and the above structure has a good fixing effect on the circuit board, preventing the circuit board from axial movement.

[0022] Optionally, the inner wall of the inner connecting sleeve is provided with a first step, and the second end of the inner connecting sleeve is provided with a second hook along the circumferential direction, and a mounting position is formed between the first step and the second hook. The first step is provided on the inner wall of the inner connecting sleeve to avoid interference with the joint during use. The first step and the second hook are easy to process, and have a good fixing effect on the bearing, so that the bearing has a strong ability to follow the axial movement of the bearing, and has a good effect of reducing vibration and stabilizing movement.

[0023] Optionally, the end face of the second hook has a guide surface for guiding the bearing when it is installed. When the bearing is installed in the installation position, its end face can slide into the installation position more easily through the guide surface, which facilitates the installation of the bearing.

[0024] Optionally, a first step is provided on the inner wall of the inner connecting sleeve, a bearing cap is installed on the second end of the inner connecting sleeve along the axial direction, and a mounting position is formed between the first step and the bearing cap. The bearing cap is installed to the second end of the inner connecting sleeve along the axial direction, the bearing cap has a simple structure, can be installed by gluing or the like, and is easy to install. The bearing is fixed by the cooperation between the first step and the bearing cap, and the fixing stability is good.

[0025] Optionally, the axial width of the outer connecting sleeve is greater than the axial width of the flexible connecting portion and the inner connecting sleeve. The above arrangement can improve the strength of the elastic member, making the elastic member more stable as a whole, and avoiding damage or even failure of the elastic member during use, which affects the stable operation of the motor.

[0026] Optionally, the flexible connection part is connected to the middle or end of the outer connection sleeve along the axial direction. According to the specific structure inside the motor, the flexible connection part can be connected to the middle or end of the outer connection sleeve along the axial direction to improve the adaptability of the elastic member.

[0027] The present application also provides a motor, comprising:

[0028] case;

[0029] The first stator, the first rotor and the motor shaft are all arranged in the housing, and the motor shaft is axially movable and rotates with the first rotor;

[0030] The elastic member as above;

[0031] The motor shaft is connected to the housing through an elastic member, and the motor shaft is supported on the elastic member through a bearing. The bearing is installed in the installation position and is axially relatively fixed with the inner connecting sleeve. The motor shaft and the housing can at least generate axial relative displacement through the flexible connection part.

[0032] The above motor is provided with an elastic member, which can assist the axial forward and backward movement of the motor shaft, reduce the vibration of the motor and stabilize the movement of the motor shaft, so that the vibration of the motor is smaller and the stability is higher.

[0033] Optionally, a first clamping portion and a second clamping portion are provided on the inner side wall of the housing, and the outer connecting sleeve is provided between the first clamping portion and the second clamping portion and is axially fixed relative to the housing. The first clamping portion and the second clamping portion are used to axially fix the outer connecting sleeve relative to the housing, preventing the outer connecting sleeve from axially moving along with the motor shaft and the bearing, thereby avoiding failure of the elastic member.

[0034] Optionally, elastic members are provided at both ends of the motor shaft, and the elastic members include a second connecting portion, and of the two end faces of the second connecting portion along the axial direction of the flexible connecting portion, the inclination degree of one end face is greater than the inclination degree of the other end face; and the end faces of the second connecting portions with relatively large inclinations in the two elastic members are arranged opposite to each other. The end faces of the second connecting portions with relatively large inclinations in the two elastic members are arranged opposite to each other, and when the motor shaft moves axially, one of the end faces with relatively large inclinations is more likely to deform, which can promote the axial movement of the corresponding bearing. The other end face with relatively large inclination is not easy to deform, which prevents the corresponding bearing from moving axially, and has a rebound effect when the motor is reset after the axial movement of the motor. Therefore, it can coordinate and stabilize the axial movement of the motor shaft, and further improve the vibration reduction effect.

[0035] The present application also provides an electric toothbrush, comprising the above motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a front view of the elastic member of this embodiment;

[0037] Figure 2 It is a cross-sectional view taken along line AA of this embodiment;

[0038] Figure 3 is a three-dimensional diagram of the elastic member of this embodiment;

[0039] Figure 4 This is a front view of another implementation of the elastic member of this embodiment;

[0040] Figure 5 It is a cross-sectional view taken at line BB of this embodiment;

[0041] Figure 6 is a three-dimensional diagram of another implementation of the elastic member of this embodiment;

[0042] Figure 7 It is a rear view of the motor of this embodiment;

[0043] Figure 8 It is a cross-sectional view at CC of this embodiment;

[0044] Fig. 9 This is a partial enlarged view of point D of this embodiment;

[0045] Fig.10 It is a rear view of the motor housing of this embodiment;

[0046] Fig.11 It is a cross-sectional view at EE of this embodiment.

[0047] Description of reference numerals:

[0048] 1-external connecting sleeve; 2-flexible connecting part; 22-second connecting part; 23-first connecting part; 3-inner connecting sleeve; 31-second hook; 311-guide surface; 32-first clip; 33-first step; 4-bearing cover; 10-motor; 101-housing; 102-motor shaft; 103-circuit board; 104-bearing; 105-first rotor; 106-first stator; 107-second rotor; 108-second stator; 1011-axial limiting protrusion. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0051] An elastic member of this embodiment, see Figures 1 to 6 , the above-mentioned motor shaft bearing is the bearing 104, the motor shaft 102 is the motor output shaft, and the motor housing is the housing 101. The elastic member includes an inner connecting sleeve 3, an outer connecting sleeve 1 and a flexible connecting portion 2 which are coaxially arranged, and the inner connecting sleeve 3, the outer connecting sleeve 1 and the flexible connecting portion 2 can be integrally formed by processing. The inner connecting sleeve 3 has an axially through-hole, and a mounting position for mounting the bearing 104 is arranged in the center hole, and the bearing 104 is coaxially arranged in the mounting position with the center hole. The bearing 104 is outer-circuited on the motor shaft 102 and can move axially forward and backward with the motor shaft 102. The outer connecting sleeve 1 is located on the periphery of the inner connecting sleeve 3, and the outer wall of the outer connecting sleeve 1 is connected to the inner wall of the housing 101 of the motor 10. Specifically, the outer wall of the external connecting sleeve 1 is pressed against the inner wall of the housing 101 of the motor 10, and the inner wall of the housing 101 of the motor 10 is provided with axial limiting protrusions 1011 at axial intervals, and the two end faces of the external connecting sleeve 1 with an axial distance between the two axial limiting protrusions 1011 respectively press against the opposite end faces of the two axial limiting protrusions 1011, thereby pressing the external connecting sleeve 1 axially.

[0052] The flexible connection part 2 is connected between the inner connection sleeve 3 and the outer connection sleeve 1, and the flexible connection part 2 is elastic and can produce elastic deformation. By arranging the flexible connection part 2 between the inner connection sleeve 3 and the outer connection sleeve 1, the overall structure is simple. The flexible connection part 2 can produce elastic deformation. When the bearing 104 is set in the installation position, the flexible connection part 2 allows the inner connection sleeve 3 and the bearing 104 to produce axial displacement relative to the outer connection sleeve 1, so that the elastic member can assist the motor shaft 102 to move forward and backward along the axial direction, which is beneficial to reduce the vibration of the motor and stabilize the axial forward and backward movement of the motor shaft.

[0053] Exemplarily, the inner connection sleeve 3 and the outer connection sleeve 1 are both cylindrical, and the flexible connection part 2 is made of rubber, and the material of the flexible connection part 2 is not limited here. The flexible connection part 2 can produce elastic deformation, so that the inner connection sleeve 3 and the outer connection sleeve 1 can produce relative displacement at least along the axial direction of the inner connection sleeve 3. In another embodiment, the inner connection sleeve 3 and the outer connection sleeve 1 can produce relative displacement along the axial direction and / or radial direction of the inner connection sleeve 3. Exemplarily, the flexible connection part 2 is sheet-shaped, which is convenient for deformation, so that it can better assist the motor shaft 102 in axial movement, which is conducive to vibration reduction and stable movement.

[0054] In this embodiment, a flexible connection part 2 is provided between the inner connection sleeve 3 and the outer connection sleeve 1, and the overall structure is simple. The flexible connection part 2 can produce elastic deformation, so that the inner connection sleeve 3 and the outer connection sleeve 1 can produce relative displacement at least along the axial direction of the inner connection sleeve 3, so that the inner connection sleeve 3 can achieve large-angle swing and axial forward and backward movement with the bearing 104, and assist the motor shaft 102 to move forward and backward along the axial direction, so as to reduce the vibration of the motor 10 and stabilize the movement of the motor shaft 102.

[0055] In one embodiment, if Figures 1 to 6 As shown, the elastic member also includes a first connection portion 23 and a second connection portion 22, and the inner wall of the flexible connection portion 2 and the outer wall of the inner connection sleeve 3 have a radial gap, and the outer wall of the flexible connection portion 2 and the inner wall of the outer connection sleeve 1 have a radial gap. The flexible connection portion 2 is connected to the outer wall of the inner connection sleeve 3 through the first connection portion 23. Specifically, the first end of the first connection portion 23 is connected to the outer wall of the inner connection sleeve 3, and the second end is connected to the inner wall of the flexible connection portion 2. The flexible connection portion 2 is connected to the inner wall of the outer connection sleeve 1 through the second connection portion 22. Specifically, the flexible connection portion 2 is a ring-shaped structure that is disconnected at one point, and the opposite ends of the flexible connection portion 2 at the disconnection point are respectively connected to the two end faces of the second connection portion 22 along the circumference of the flexible connection portion 2. In another embodiment, the flexible connection portion 2 is a complete ring-shaped structure. The first end of the second connection portion 22 is connected to the outer wall of the flexible connection portion 2, and the second end is connected to the inner wall of the outer connection sleeve 1. The radial clearance between the flexible connection part 2 and the inner connection sleeve 3 and the outer connection sleeve 1 can avoid interference between the flexible connection part 2 and the inner connection sleeve 3 and the outer connection sleeve 1 when they are displaced, which is conducive to the smooth relative displacement of the inner connection sleeve 3 relative to the outer connection sleeve 1 through the flexible connection part 2, thereby improving the deformation reliability of the elastic member. The first connection part 23 and the second connection part 22 can improve the connection strength between the flexible connection part 2 and the inner connection sleeve 3 and the outer connection sleeve 1 while maintaining the deformation reliability. In one embodiment, Figure 1 and Figure 3As shown, the first connection portion 23 and the second connection portion 22 are staggered along the circumferential direction of the flexible connection portion 2, that is, the first connection portion 23 and the second connection portion 22 are not on the same straight line along the radial direction of the flexible connection portion 2. This can avoid the elastic member being damaged and ineffective due to excessive concentration of force caused by the first connection portion 23 and the second connection portion 22 being arranged on a straight line along the radial direction of the flexible connection portion 2, thereby improving the deformation capacity of the elastic member.

[0056] In one embodiment, if Figure 1 and Figure 3 As shown, the first connection parts 23 are at least one pair arranged opposite to each other, and / or the second connection parts 22 are at least one pair arranged opposite to each other. Specifically, the first connection parts 23 are a pair arranged on the same straight line along the radial direction of the flexible connection part 2, and the second connection parts 22 are a pair arranged on the same straight line along the radial direction of the flexible connection part 2. On the one hand, it can improve the connection strength between the outer connection sleeve 1 and the inner connection sleeve 3 and the flexible connection part 2, and on the other hand, it will not limit the overall deformation capacity of the flexible connection part 2. In another embodiment, the first connection parts 23 may be multiple pairs, and each pair is correspondingly arranged on the same straight line along the radial direction of the flexible connection part 2; the second connection parts 22 may be multiple pairs, and each pair is correspondingly arranged on the same straight line along the radial direction of the flexible connection part 2.

[0057] In one embodiment, if Figures 2 to 6 As shown, the thickness of the second connection part 22 at one end close to the outer connection sleeve 1 is greater than the thickness of the second connection part 22 at one end close to the flexible connection part 2. That is, the thickness of the second connection part 22 along the axial direction of the flexible connection part 2 gradually increases from the inside to the outside. Specifically, the thickness of the inner end of the second connection part 22 along the axial direction of the flexible connection part 2 is less than the thickness of the outer end. It is beneficial to strengthen the overall strength of the flexible connection part 2 and the outer connection sleeve 1. At the same time, the thinner end is connected to the flexible connection part 2, which further facilitates the deformation of the flexible connection part 2, improves the deformation capacity of the flexible connection part, and improves the overall reliability of the elastic part. That is to say, it is convenient for the inner connection sleeve 3 and the outer connection sleeve 1 to produce relative displacement along the axial direction of the inner connection sleeve 3, thereby improving the overall vibration reduction effect of the elastic part.

[0058] In one embodiment, if Figures 2 to 6As shown, of the two end faces of the second connection part 22 along the axial direction of the flexible connection part 2, the inclination of one end face is greater than the inclination of the other end face. Exemplarily, the two end faces of the second connection part 22 along the axial direction of the flexible connection part 2 can both be inclined surfaces, and the inclination of one end face is greater than the inclination of the other end face; or, of the two end faces of the second connection part 22 along the axial direction of the flexible connection part 2, one is an inclined surface, and the other is not an inclined surface, and the inclination of the inclined surface is greater than the inclination of the other end face. The end face with a larger inclination can facilitate the deformation of the flexible connection part 2, improve the deformation capacity of the flexible connection part 2, thereby facilitating the relative displacement between the inner connection sleeve 3 and the outer connection sleeve 1 along the axial direction of the inner connection sleeve 3, and improving the overall vibration reduction effect of the elastic member. The front and rear ends of the motor shaft 102 in the housing 101 are respectively supported on the inner wall of the housing 101 by a corresponding elastic member, and the end faces of the second connection part 22 with a relatively large inclination in the two elastic members are arranged opposite to each other. That is, two end faces with relatively large inclinations are arranged opposite to each other. When the motor shaft 102 moves axially, one of the end faces with relatively large inclinations is more likely to deform, which can promote the axial movement of the corresponding bearing 104. The other end face with relatively large inclinations is not easy to deform, which prevents the corresponding bearing 104 from moving axially and has a rebound effect. The two end faces with relatively large inclinations produce elastic deformations with opposite forces, which can buffer the collision force and reduce the rigid collision loss. At the same time, they can also better support and constrain the motor shaft 102 and prevent the motor shaft 102 from shaking significantly. At the same time, it can coordinate and stabilize the axial movement of the motor shaft 102, further improving the vibration reduction effect.

[0059] In one embodiment, if Figure 2 As shown, the end surface of the second connection portion 22 with a relatively large axial inclination of the flexible connection portion 2 and the second hook 31 are arranged at the same end along the axial direction.

[0060] In one embodiment, at least part of the flexible connection part 2 along the circumferential direction is wavy. Specifically, part of the flexible connection part 2 along the circumferential direction is wavy, or the flexible connection part 2 along the circumferential direction is all wavy. That is, at least part of the flexible connection part 2 along the circumferential direction is a high-low undulating structure that undulates along the axial direction. That is, at least part of the flexible connection part 2 along the circumferential direction is a high-low undulating structure, and the undulating direction of the flexible connection part 2 is along the axial direction. The above-mentioned arrangement can improve the elasticity and elastic deformation capacity of the flexible connection part 2, thereby improving the vibration reduction effect of the elastic member.

[0061] In one embodiment, the flexible connection part 2 includes an annular structure surrounded by a spring and / or a spring sheet. Specifically, the flexible connection part 2 includes a spring and a spring sheet; or, the flexible connection part 2 includes a spring or a spring sheet. That is, the flexible connection part 2 can be entirely composed of a spring and a spring sheet, or it can be partially composed of a spring and partially composed of a spring sheet. Exemplarily, the two ends of the spring or the spring sheet are respectively connected to the adjacent first connection part 23 and the second connection part 22, and the first connection part 23 and the second connection part 22 are elastic structures made of rubber material. Exemplarily, the first end of the spring or the spring sheet is connected to one side of the first connection part 23 along the circumference of the flexible connection part 2, and the second end is connected to one side of the second connection part 22 along the circumference of the flexible connection part 2. The ends of the spring or the spring sheet can be arranged on the side or inside of the first connection part 23 and the second connection part 22 along the circumference of the flexible connection part 2 by injection molding.

[0062] In one embodiment, the flexible connection part 2 includes springs arranged at intervals in the circumferential direction, the springs are arranged along the radial direction of the flexible connection part 2, the outer end of the spring along the radial direction of the outer connection sleeve 1 is connected to the outer connection sleeve 1, and the inner end along the radial direction of the outer connection sleeve 1 is connected to the inner connection sleeve 3. For example, there may be multiple springs, each of which is arranged at intervals in the circumferential direction, and the spring is arranged radially between the outer connection sleeve 1 and the inner connection sleeve 3, and its two ends are respectively connected to the inner wall of the outer connection sleeve 1 and the outer wall of the inner connection sleeve 3. The above-mentioned setting method has a simple structure, so that the flexible connection part 2 has a strong deformation ability and improves the vibration reduction effect of the elastic member.

[0063] In one embodiment, the flexible connection part 2 has a hollow structure, that is, the end surface of the flexible connection part 2 along the axial direction has a hollow structure. The hollow structure can improve the elasticity and deformation capacity of the flexible connection part 2, thereby improving the vibration reduction effect of the elastic member.

[0064] In one embodiment, the flexible connection part 2 is a conical coil spring coaxially arranged with the inner connection sleeve 3, the large diameter end of the conical coil spring is connected to the inner wall of the outer connection sleeve 1, and the small diameter end outer sleeve is connected to the inner connection sleeve 3. The end with a larger inner diameter of the conical coil spring is the large diameter end, and the end with a smaller inner diameter is the small diameter end. The conical coil spring is a spring whose axial diameter gradually increases or decreases, and has good strength. As the degree of deformation increases, the number of conical coil springs participating in the work will become less and less, and the spring index will also develop in a smaller direction, which makes the conical coil spring harder and harder, thereby preventing the conical coil spring from further deformation, and playing a role in stabilizing the movement of the motor shaft 102.

[0065] In one embodiment, if Fig. 9As shown, the inner connecting sleeve 3 fixes the circuit board 103 for controlling the rotation angle of the motor, and the deformation displacement part of the inner connecting sleeve 3 can drive the circuit board 103 to move together. A magnetic part is arranged on the motor shaft 102, and the sensor on the circuit board 103 realizes the control of the electric toothbrush at a large circumferential angle by detecting the magnetic part, and the large angle range is between 10° and 60°. When the motor has axial displacement movement and the above-mentioned circumferential rotation, the circuit board 103 with the sensor is arranged on the elastic part. When the axial movement of the motor shaft drives the deformation of the elastic part, the circuit board 103 will move axially with the motor shaft. Since the magnetic part is fixed on the motor shaft, that is, the circuit board 103 and the magnetic part move axially with the motor shaft, the relative distance between the circuit board with the sensor and the magnetic part remains unchanged, so that the elastic part can realize the toothbrush motor and the electric toothbrush with axial movement and large circumferential angle control at the same time. The elastic part prevents the distance between the circuit board 103 with the sensor and the magnetic part from changing, and further avoids the failure of the large circumferential angle control function of the motor with axial movement.

[0066] In one embodiment, a coupling portion for connecting the circuit board 103 is provided at the left end of the inner connecting sleeve 3 in the axial direction. The coupling portion can connect and fix the circuit board 103, so that the circuit board 103 and the bearing 104 are relatively fixed. When the motor shaft 102 moves significantly in the axial direction, the circuit board 103 will also move significantly in the axial direction with the motor shaft. When the distance between the circuit board and the magnetic part is greater than the effective distance, the function of the electric toothbrush to control the circumferential angle will fail. By controlling the distance between the circuit board and the bearing to always be within the effective range, it is ensured that the function of the electric toothbrush to control the circumferential angle is not destroyed.

[0067] In one embodiment, if Figure 2 and Fig. 9 As shown, the combination portion includes at least two first clips 32 arranged along the circumferential direction. For example, the first clips 32 are evenly distributed along the circumferential direction of the end of the inner connecting sleeve 3. The first clip 32 includes a connecting arm extending from the first end face of the inner connecting sleeve 3 in the axial direction and extending in the axial direction, and a first hook arranged on the connecting arm and folded outward, and a fixing position for fixing the circuit board 103 is formed between the first hook and the first end face of the inner connecting sleeve 3 in the axial direction. For example, the circuit board 103 is an annular circuit board, and a square hole penetrating the thickness direction of the circuit board 103 is arranged at the axis of the circuit board 103. The first hook passes through the square hole and abuts against the first end face of the circuit board 103 in the axial direction, and the second end face of the circuit board 103 abuts against the first end face of the inner connecting sleeve 3 in the axial direction. The structure of the connecting arm and the first hook is simple and easy to process, and the above structure has a good fixing effect on the circuit board 103, avoiding the axial movement of the circuit board 103. The space occupied by the first hook is small, avoiding interference with other components in the motor 10, and also avoiding causing the internal structure of the motor 10 to be crowded.

[0068] In one embodiment, if Figure 1 and Figure 3 As shown, the inner wall of the inner connecting sleeve 3 is provided with a first step 33 extending along its circumferential direction, and the second end face of the inner connecting sleeve 3 along the axial direction is provided with at least two second hooks 31 folded inwardly along the circumferential direction, and a mounting position is formed between the first step 33 and the second hook 31. Exemplarily, a plurality of second hooks 31 are evenly distributed along the circumferential direction on the second end face of the inner connecting sleeve 3 along the axial direction, and the first step 33 is provided on the inner wall of the first end of the inner connecting sleeve 3 along the axial direction. The first step 33 is provided on the inner wall of the inner connecting sleeve 3 to avoid interference with the joint during use. The first step 33 and the second hook 31 are easy to process, and have a good fixing effect on the bearing 104, and can prevent the bearing 104 from being dislodged due to force when moving forward and backward in the axial direction, so as to have a strong ability to follow the axial movement of the bearing 104, and have a good effect of reducing vibration and stabilizing movement. The second hook 31 occupies a small space, which avoids interference with other components in the motor 10 and also avoids causing the internal structure of the motor 10 to be crowded.

[0069] In one embodiment, the first step 33 is provided with one section along the circumference of the inner wall of the inner connecting sleeve 3; or, the first step 33 is provided with multiple sections along the circumference of the inner wall of the inner connecting sleeve 3; or, the first step 33 is provided with one circle along the circumference of the inner wall of the inner connecting sleeve 3. The provision of the first step 33 can abut against the end face of the bearing 104 to fix the bearing 104. The first step 33 is provided with one section along the circumference of the inner wall of the inner connecting sleeve 3, that is, it can play a role in fixing the end face of the bearing 104. The first step 33 is provided with multiple sections along the circumference of the inner wall of the inner connecting sleeve 3, or, the first step 33 is provided with one circle along the circumference of the inner wall of the inner connecting sleeve 3, which can improve the fixing effect of the bearing 104 and improve the fixing stability of the bearing 104.

[0070] In one embodiment, if Figure 2 As shown, the end face of the second hook 31 has a guide surface 311 for guiding the bearing 104 when it is installed. The guide surface 311 is an inclined surface whose height gradually decreases from the outside to the inside along the radial direction of the inner connecting sleeve 3, and the guide surface 311 is arranged at the end face of the second hook 31 at a position closer to the inside along the radial direction of the inner connecting sleeve 3. When the bearing 104 is installed in the installation position, the end face of the bearing 104 can slide into the installation position more easily through the guide surface 311, so as to facilitate the installation of the bearing 104.

[0071] In one embodiment, if Figures 4 to 6As shown, the inner wall of the inner connecting sleeve 3 is provided with a first step 33, and the second end of the inner connecting sleeve 3 along the axial direction is installed with a bearing cover 4, and a mounting position is formed between the first step 33 and the bearing cover 4. Exemplarily, the first step 33 is provided on the inner wall of the first end of the inner connecting sleeve 3 along the axial direction, and the first step 33 extends circumferentially along the inner wall of the inner connecting sleeve 3, and the bearing cover 4 extends along its axial end surface toward the center of the center hole, and the part extending into the center hole fixes the bearing 104 together with the first step 33. The bearing cover 4 can be connected to the outer wall of the inner connecting sleeve 3 by means of adhesive or plastic sealing, and there is a gap between the end face of the bearing cover 4 and the second end face of the inner connecting sleeve 3 along the axial direction. The bearing cover 4 has a simple structure and is easy to install. The bearing 104 is fixed by the cooperation between the first step 33 and the bearing cover 4, and the fixing effect is good.

[0072] In one embodiment, if Figure 2 As shown, the axial width of the outer connecting sleeve 1 is greater than the axial width of the flexible connecting portion 2 and the axial width of the inner connecting sleeve 3, that is, among the outer connecting sleeve 1, the flexible connecting portion 2 and the inner connecting sleeve 3, the axial width of the outer connecting sleeve 1 is the largest. The above arrangement can improve the strength of the elastic member, making the elastic member more stable as a whole, and avoiding damage or even failure of the elastic member during use, which affects the stable operation of the motor 10.

[0073] In one embodiment, if Figure 2 and Figure 5 As shown, the flexible connection part 2 is connected to the middle or end of the outer connection sleeve 1 in the axial direction, that is, the end surface of the connection between the flexible connection part 2 and the outer connection sleeve 1 in the axial direction is flush with the end surface of the outer connection sleeve 1 in the axial direction. According to the specific structure inside the motor 10, the flexible connection part 2 can be selected to be connected to the middle or end of the outer connection sleeve 1 in the axial direction to improve the adaptability of the elastic member.

[0074] In one embodiment of the present application, a motor is also provided. Figures 7 to 11 As shown, including:

[0075] Housing 101;

[0076] A first stator 106, a first rotor 105 and a motor shaft 102, wherein the motor shaft 102 is axially movable and rotates with the first rotor 105, and the first stator 106 and the first rotor 105 are both fitted at the front end of the motor shaft 102;

[0077] The elastic member as above;

[0078] The motor shaft 102 is connected to the housing 101 through an elastic member, a bearing 104 is provided on the outer wall of the motor shaft 102, the motor shaft 102 is supported on the elastic member through the bearing 104, the bearing 104 is installed in the installation position of the inner connecting sleeve 3, and is relatively fixed axially with the inner connecting sleeve 3, and the motor shaft 102 and the housing 101 can at least generate axial relative displacement through the flexible connecting portion 2. Specifically, the motor shaft 102 and the housing 101 can generate axial and / or radial relative displacement through the flexible connecting portion 2.

[0079] The motor 10 is provided with an elastic member, which can assist the axial forward and backward movement of the motor shaft 102, reduce the vibration of the motor 10 and stabilize the movement of the motor shaft 102, so that the vibration of the motor 10 is smaller and the stability is higher.

[0080] In one embodiment, a first clamping portion and a second clamping portion are provided on the inner side wall of the housing 101, and the outer connecting sleeve 1 is provided between the first clamping portion and the second clamping portion, and is axially relatively fixed with the housing 101. The outer connecting sleeve 1 is axially relatively fixed with the housing 101 by the first clamping portion and the second clamping portion, preventing the outer connecting sleeve 1 from axially moving along with the motor shaft 102 and the bearing 104, thereby avoiding failure of the elastic member.

[0081] In one embodiment, if Figure 8 As shown, the motor 10 further includes a second stator 108 and a second rotor 107, which are matched with the rear end of the motor shaft 102. The motor shaft 102 is connected to the second rotor 107 and driven axially by the second rotating shaft. The motor shaft 102 can move axially under the cooperative drive of the second stator 108 and the second rotor 107, thereby increasing the functionality of the motor 10.

[0082] In one embodiment, if Figure 8 and Fig. 9As shown, both the front and rear ends of the motor shaft 102 are provided with elastic members, that is, the front and rear ends of the motor shaft 102 are supported on the housing 101 by a corresponding elastic member, respectively, and the elastic member includes a second connecting portion 22, and the inclination degree of one end face of the second connecting portion 22 along the axial direction of the flexible connecting portion 2 is greater than the inclination degree of the other end face; and the end faces of the second connecting portion 22 with a relatively large inclination degree in the two elastic members are arranged opposite to each other. The front end of the motor shaft 102 is supported in the front end of the housing 101 by an elastic member, and the rear end of the motor shaft 102 is supported in the rear end of the housing 101 by another elastic member, and the end faces of the second connecting portion 22 with a relatively large inclination degree in the two elastic members are arranged opposite to each other. By providing two elastic members, the vibration reduction effect on the motor shaft 102 can be improved, and the vibration of the motor 10 can be further reduced. When the motor shaft 102 moves in the axial direction, one of the end faces with a relatively large inclination degree is more likely to deform, which can promote the movement of the corresponding bearing 104 in the axial direction. The other end face with a relatively large inclination is not easily deformed, preventing the corresponding bearing 104 from moving in the axial direction, and having a rebound effect. The two end faces with relatively large inclinations produce elastic deformation with opposite forces, which can buffer the collision force and reduce the rigid collision loss. At the same time, it can also better support and constrain the motor shaft 102 to prevent the motor shaft 102 from shaking significantly. At the same time, it can coordinate and stabilize the axial movement of the motor shaft 102, further improving the vibration reduction effect.

[0083] In one embodiment, if Figure 8 and Fig. 9 As shown, the motor 10 further includes a circuit board 103, which is exemplarily a ring-shaped circuit board. The circuit board 103 is located at the periphery of the motor shaft 102, and the circuit board 103 has a free end and a fixed end, and the fixed end of the circuit board 103 is mounted on the inner connecting sleeve 3 of the elastic member. The inner connecting sleeve 3 can connect and fix the circuit board 103, so that the circuit board 103 and the bearing 104 are relatively fixed.

[0084] In one embodiment, if Figures 8 to 11 As shown, the outer wall of the outer connecting sleeve 1 abuts against the inner wall of the shell 101 to fix the outer connecting sleeve 1 in the radial direction of the shell 101. The inner wall of the shell 101 is provided with axial limiting protrusions 1011 at intervals along its axial direction, that is, the first clamping portion and the second clamping portion are both axial limiting protrusions 1011, and the two ends of the outer connecting sleeve 1 in the axial direction respectively abut against the axial opposite ends of the two axial limiting protrusions 1011. By providing the axial limiting protrusions 1011, the two ends of the outer connecting sleeve 1 in the axial direction can be fixed to prevent the outer connecting sleeve 1 from axially moving and causing the elastic member to fail.

[0085] This embodiment also provides an electric toothbrush, comprising the above motor 10.

[0086] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. An elastic member, characterized in that: include: The inner connecting sleeve has an axially penetrating center hole, wherein a mounting position for mounting a motor bearing is arranged in the center hole; An outer connecting sleeve, located outside the inner connecting sleeve and used for connecting with the motor housing; A flexible connection portion is connected between the inner connection sleeve and the outer connection sleeve, and the flexible connection portion can produce elastic deformation so that the inner connection sleeve and the outer connection sleeve can produce relative displacement at least along the axial direction of the inner connection sleeve.

2. The elastic member according to claim 1, characterized in that: The elastic member also includes a first connecting portion and a second connecting portion. The flexible connecting portion has a radial gap with the inner connecting sleeve and the outer connecting sleeve respectively. The flexible connecting portion is connected to the outer wall of the inner connecting sleeve through the first connecting portion, and the flexible connecting portion is connected to the inner wall of the outer connecting sleeve through the second connecting portion.

3. The elastic member according to claim 2, characterized in that: The first connection portion and the second connection portion are staggered along the circumference of the flexible connection portion.

4. The elastic member according to claim 2 or 3, characterized in that: The first connection parts are at least one pair disposed opposite to each other, and / or the second connection parts are at least one pair disposed opposite to each other.

5. The elastic member according to claim 2 or 3, characterized in that: The thickness of one end of the second connection portion close to the outer connection sleeve is greater than the thickness of one end of the second connection portion close to the flexible connection portion.

6. The elastic member according to claim 2 or 3, characterized in that: Of the two end surfaces of the second connection portion along the axial direction of the flexible connection portion, the inclination degree of one end surface is greater than the inclination degree of the other end surface.

7. The elastic member according to claim 2 or 3, characterized in that: At least a portion of the flexible connection portion along the circumferential direction is wavy.

8. The elastic member according to claim 2 or 3, characterized in that: The flexible connection portion has a hollow structure.

9. The elastic member according to claim 2 or 3, characterized in that: At least part of the flexible connection portion is a spring or a spring sheet.

10. The elastic member according to claim 1, characterized in that: The flexible connection part is a spring arranged radially along the outer connecting sleeve and arranged at intervals along the circumference of the outer connecting sleeve. The outer end of the spring along the radial direction of the outer connecting sleeve is connected to the outer connecting sleeve, and the inner end along the radial direction of the outer connecting sleeve is connected to the inner connecting sleeve.

11. The elastic member according to claim 1, characterized in that: The flexible connection part is a conical coil spring coaxially arranged with the inner connecting sleeve, the large diameter end of the conical coil spring is connected to the outer connecting sleeve, and the small diameter end outer sleeve is connected to the inner connecting sleeve.

12. The elastic member according to claim 1, characterized in that: The inner connecting sleeve fixes a circuit board for controlling the rotation angle of the motor, and the deformation displacement part of the inner connecting sleeve can drive the circuit board to move together.

13. The elastic member according to claim 12, characterized in that: A coupling portion is provided at a first end of the inner connecting sleeve along the axial direction, and the coupling portion is used for connecting the circuit board.

14. The elastic member according to claim 13, characterized in that: The coupling portion includes a first clip arranged along the circumferential direction, the first clip includes a first hook folded outward, and the first hook and the side wall surface of the inner connecting sleeve are used to fix the circuit board.

15. The elastic member according to any one of claims 1 to 3, characterized in that: The inner wall of the inner connecting sleeve is provided with a first step, and the second end of the inner connecting sleeve is provided with a second hook along the circumferential direction, and the installation position is formed between the first step and the second hook.

16. The elastic member according to claim 15, characterized in that: The end surface of the second hook has a guide surface for guiding the bearing when it is installed.

17. The elastic member according to any one of claims 1 to 3, characterized in that: The inner wall of the inner connecting sleeve is provided with a first step, and a bearing cover is installed at the second end of the inner connecting sleeve along the axial direction, and the installation position is formed between the first step and the bearing cover.

18. The elastic member according to any one of claims 1 to 3, characterized in that: The axial width of the outer connecting sleeve is greater than the axial widths of the flexible connecting portion and the inner connecting sleeve.

19. The elastic member according to any one of claims 1 to 3, characterized in that: The flexible connection portion is connected to the middle portion or the end portion of the outer connection sleeve along the axial direction.

20. A motor, characterized in that: include: case; The first stator, the first rotor and the motor shaft are all arranged in the housing, and the motor shaft is axially movable and rotates with the first rotor; The elastic member according to any one of claims 1 to 19; The motor shaft is connected to the housing through the elastic member, and the motor shaft is supported on the elastic member through a bearing. The bearing is installed in the installation position and is axially relatively fixed with the inner connecting sleeve. The motor shaft and the housing can generate axial relative displacement at least through the flexible connection part.

21. The electric machine according to claim 20, characterized in that A first clamping portion and a second clamping portion are provided on the inner side wall of the shell, and the outer connecting sleeve is provided between the first clamping portion and the second clamping portion and is axially relatively fixed to the shell.

22. The electric machine according to claim 20 or 21, characterized in that Elastic parts are provided at both ends of the motor shaft, and the elastic parts include a second connecting part. Among the two end faces of the second connecting part along the axial direction of the flexible connecting part, the inclination degree of one end face is greater than the inclination degree of the other end face; and the end faces of the second connecting parts with relatively larger inclination degrees in the two elastic parts are arranged opposite to each other.

23. An electric toothbrush, characterized in that: Comprising the motor as claimed in any one of claims 20-22.

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