Electric toothbrush motor

Abstract

The utility model discloses an electric toothbrush motor which comprises a shell, a stator support, two iron cores, two coils and a rotor are arranged in the shell, the two coils are sequentially connected in series, the rotor is arranged in the stator support, a gap is formed between the rotor and the stator support, and a transmission shaft is arranged at the axis of the rotor in a penetrating mode. The upper end and the lower end of the transmission shaft extend towards the outer side of the shell respectively, two symmetrically-arranged receding openings are formed in the side portion of the stator support, winding parts protruding outwards are formed at the upper ends and the lower ends of the receding openings respectively, the two receding openings are covered with the two iron cores respectively, the coils correspond to the iron cores one to one, and the winding parts are wound around the winding parts. The iron core is embedded between the upper winding part and the lower winding part, and the coil is wound on the outer sides of the upper winding part, the lower winding part and the iron core. The utility model has the characteristics of easy winding, simplified structure and the like.

Description

Technical Field

[0001] The utility model relates to a motor, in particular to an electric toothbrush motor. Background Art

[0002] The electric toothbrush motor is a power device that drives the toothbrush head to swing back and forth by rotating alternately in forward and reverse directions at a small angle. For the relevant structure, please refer to the Chinese patent publication with the announcement number CN205847045U, which records: "It includes a motor front cover, a motor rear cover, and a main shaft arranged between the motor front cover and the motor rear cover, a main shaft bracket, a bearing, a silicon steel sheet, a magnet, a coil, a silicon steel sheet bracket and a motor rear cover; one end of the main shaft is sleeved on the main shaft bracket, and the two ends of the main shaft bracket are each provided with a A bearing is placed on each side of the spindle bracket, a magnet is set on each side, the spindle bracket is set in the silicon steel sheet, the silicon steel sheet is fixed on the silicon steel sheet bracket, and a coil is set between the silicon steel sheet and the silicon steel sheet bracket. In this type of structure, the spindle needs to be supported by the spindle bracket, and the silicon steel sheet and coil need to be supported by the silicon steel sheet bracket. This type of motor not only has many parts, but also has a complicated assembly process. In particular, the coil is located on the inner side of the silicon steel sheet bracket, so it is difficult to wind the coil, which is not conducive to production and manufacturing. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide an electric toothbrush motor which is easy to wind and has a simplified structure, in view of the deficiencies in the prior art.

[0004] In order to solve the above technical problems, the present utility model adopts the following technical solutions.

[0005] An electric toothbrush motor includes a shell, in which a stator bracket, two iron cores, two coils connected in series and a rotor are provided. The rotor is provided in the stator bracket with a gap between the two. A transmission shaft is passed through the axis of the rotor, and the upper and lower ends of the transmission shaft extend to the outside of the shell respectively. Two symmetrical avoidance openings are provided on the side of the stator bracket, and the upper and lower ends of the avoidance openings are respectively formed with winding portions protruding outward. The two iron cores cover the two avoidance openings respectively. The coils correspond to the iron cores one by one. The iron core is embedded between the upper and lower winding portions. The coils are wound around the upper and lower winding portions and the outside of the iron core.

[0006] Preferably, a winding groove is formed between the winding portion and the stator bracket, and accommodating grooves are respectively formed on both sides of the iron core. The accommodating grooves are communicated with the winding grooves, and the coils are arranged in the winding grooves and the accommodating grooves.

[0007] Preferably, the iron core includes an inner arc-shaped portion, an outer arc-shaped portion, and a connecting portion located between the inner arc-shaped portion and the outer arc-shaped portion, and the accommodating groove is formed between the inner arc-shaped portion and the outer arc-shaped portion.

[0008] Preferably, first step portions are formed on both side edges of the avoidance opening, and second step portions are formed on both side edges of the inner arc-shaped portion, and the second step portions are aligned one-to-one with the first step portions and engage with each other.

[0009] Preferably, a first wiring groove is formed on the outer side wall of the stator bracket, and the enameled wire connected between the two coils passes through the first wiring groove.

[0010] Preferably, a bottom cover is fixed to the bottom of the shell, bearings are embedded on the top of the shell and the bottom cover, and the transmission shaft passes through the upper and lower bearings.

[0011] Preferably, a limiting ring is sleeved on the transmission shaft and the two are engaged with each other, the limiting ring includes two outwardly extending stop arms, and two limit blocks are formed on the bottom cover, the stop arms correspond one to one with the limit blocks, and when the stop arms rotate to a preset angle, they abut against the limit blocks.

[0012] Preferably, the outer side wall of the transmission shaft is formed with a cut portion, the opening edge of the limiting ring is formed with a corner cut portion, and the cut portion and the corner cut portion are engaged with each other.

[0013] Preferably, a second wiring groove is provided on the bottom cover, and the lead wire of the coil passes through the second wiring groove.

[0014] Preferably, two outwardly protruding positioning protrusions are formed on the edge of the bottom cover.

[0015] In the electric toothbrush motor disclosed by the present invention, the stator bracket is arranged in the shell, and the rotor is rotatably arranged on the inner side of the stator bracket. The rotor has multiple magnets, and two iron cores and two coils are all arranged on the stator bracket. Compared with the structure in which the rotor bracket and the iron core bracket are separately provided, the utility model only uses one stator bracket to match the rotor and the iron core. In addition, during assembly, the iron core can be aligned with the avoidance opening on the side of the stator bracket. Since the upper and lower ends of the avoidance opening each have a winding part, the iron core can be directly embedded between the upper and lower winding parts. At this time, the upper and lower winding parts and the iron core form a complete winding component, so the coil can be directly wound on the outside of the winding component formed by the upper and lower winding parts and the iron core. Because the coil is located on the outside of the stator bracket, compared with the method of winding on the inside, the utility model is easier to perform winding operations, which not only simplifies the process flow but also improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional diagram of the electric toothbrush motor of the present utility model;

[0017] Figure 2 This is an exploded view of the electric toothbrush motor of the present utility model;

[0018] Figure 3 This is the structural diagram of the stator bracket, core and coil after assembly;

[0019] Figure 4 This is an exploded view of the stator bracket, core and coil;

[0020] Figure 5 This is the structural diagram of the stator bracket and iron core after assembly;

[0021] Figure 6 This is a structural diagram of the rotor, transmission shaft and bottom cover;

[0022] Figure 7 This is a structural diagram of the bottom cover and shell. DETAILED DESCRIPTION

[0023] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0024] The utility model discloses an electric toothbrush motor, combined with Figures 1 to 5 As shown, it includes a shell 1, in which a stator bracket 2, two iron cores 3, two coils 4 connected in series and a rotor 5 are provided. The rotor 5 is provided in the stator bracket 2 with a gap between the two. A transmission shaft 6 is passed through the axis of the rotor 5, and the upper and lower ends of the transmission shaft 6 extend to the outside of the shell 1 respectively. Two symmetrical avoidance openings 20 are provided on the side of the stator bracket 2, and the upper and lower ends of the avoidance opening 20 are respectively formed with winding parts 21 protruding outward. The two iron cores 3 cover the two avoidance openings 20 respectively. The coil 4 corresponds to the iron core 3 one by one. The iron core 3 is embedded between the upper and lower winding parts 21, and the coil 4 is wound around the upper and lower winding parts 21 and the outside of the iron core 3.

[0025] In the above structure, the stator bracket 2 is arranged in the housing 1, and the rotor 5 is rotatably arranged on the inner side of the stator bracket 2. The rotor 5 has a plurality of magnets 50, and two iron cores 3 and two coils 4 are all arranged on the stator bracket 2. Compared with the structure in which the rotor bracket and the iron core bracket are separately provided, the utility model only uses one stator bracket 2 to match the rotor 5 and the iron core 3. In addition, during assembly, the iron core 3 can be aligned with the avoidance opening 20 on the side of the stator bracket 2. Because the avoidance opening 20 The upper and lower ends of the stator bracket 2 each have a winding portion 21, so the iron core 3 can be directly embedded between the upper and lower winding portions 21. At this time, the upper and lower winding portions 21 and the iron core 3 form a complete winding component, so the coil 4 can be directly wound on the outside of the winding component formed by the upper and lower winding portions 21 and the iron core 3. Because the coil 4 is located on the outside of the stator bracket 2, compared with the winding method on the inside, the utility model is easier to perform winding operations, which not only simplifies the process flow but also improves work efficiency.

[0026] In order to further position the coil 4, in this embodiment, a winding groove 210 is formed between the winding portion 21 and the stator bracket 2, and a receiving groove 30 is formed on both sides of the iron core 3. The receiving groove 30 is connected to the winding groove 210, and the coil 4 is arranged in the winding groove 210 and the receiving groove 30.

[0027] In the above structure, because the receiving groove 30 and the winding groove 210 are interconnected, the coil 4 can be confined within the receiving groove 30 and the winding groove 210, and the iron core 3 can be fixed between the upper and lower winding portions 21 during the winding of the coil 4. In addition, the upper and lower winding grooves 210 can prevent the enameled wire of the coil 4 from directly contacting the corners of the iron core 3, thereby preventing the iron core 3 from damaging the enameled wire.

[0028] For the preferred structure of the iron core 3, see Figure 4 The iron core 3 includes an inner arc-shaped portion 31, an outer arc-shaped portion 32 and a connecting portion 33 located between the inner arc-shaped portion 31 and the outer arc-shaped portion 32, and the accommodating groove 30 is formed between the inner arc-shaped portion 31 and the outer arc-shaped portion 32.

[0029] In the above structure, based on the inner arc portion 31 and the outer arc portion 32, the iron core 3 is arc-shaped (or tile-shaped) as a whole. This arc-shaped component can not only cover the avoidance opening 20 well, but also form an appropriate gap with the rotor 5 to avoid position interference with the rotor 5.

[0030] To ensure a good fit between the iron core 3 and the stator support 2, in this embodiment, first steps 200 are formed on both side edges of the avoidance opening 20, and second steps 310 are formed on both side edges of the inner arc-shaped portion 31. The second steps 310 are aligned and interlocked with the first steps 200. In this embodiment, the step-shaped portions are preferably used for interlocking connection. This structure can restrict the installation position of the iron core 3, allowing it to be securely embedded between the upper and lower winding portions 21 while ensuring that the accommodating slot 30 is aligned and connected to the winding slot 210, preventing damage to the enameled wire caused by protruding corners of the iron core 3 due to improper assembly.

[0031] In this embodiment, the two coils 4 are in series relationship. Figure 3 and Figure 4 As shown, a first wiring groove 22 is formed on the outer wall of the stator bracket 2 , and the enameled wire connected between the two coils 4 passes through the first wiring groove 22 .

[0032] As a preferred method, combining Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, a bottom cover 7 is fixed to the bottom of the housing 1 , bearings 8 are embedded on the top of the housing 1 and the bottom cover 7 , and the transmission shaft 6 passes through the upper and lower bearings 8 .

[0033] On this basis, this embodiment also has an angle limit function, see Figure 6 A limiting ring 9 is sleeved on the transmission shaft 6 and the two are engaged with each other. The limiting ring 9 includes two outwardly extending stop arms 90. Two limit blocks 70 are formed on the bottom cover 7. The stop arms 90 correspond to the limit blocks 70 one by one. When the stop arms 90 rotate at a preset angle, they abut against the limit blocks 70.

[0034] In the above structure, the limit ring 9 is sleeved on the transmission shaft 6, and the two are based on a snap-fit ​​relationship, so that the limit ring 9 performs angular displacement along with the transmission shaft 6. Correspondingly, two limit blocks 70 are formed on the bottom cover 7. When the user performs actions such as replacing the toothbrush head, if the external force is too large, the transmission shaft 6 will be driven to rotate. If the rotation angle of the transmission shaft 6 is too large, the magnet 50 and the coil 4 will be misaligned, thereby affecting the working state of the electric toothbrush. In this regard, in this embodiment, the function of the limit ring 9 and the two stop arms 90 is to limit the rotation angle of the transmission shaft 6. When the transmission shaft 6 rotates to a certain angle under the action of external force, the limit block 70 and the stop arm 90 play a resisting role, thereby limiting the rotation angle of the transmission shaft 6, so that the magnet 50 and the coil 4 remain within an appropriate angle range.

[0035] Regarding the preferred engagement relationship between the stop ring 9 and the transmission shaft 6, in this embodiment, a cutout portion 60 is formed on the outer wall of the transmission shaft 6, and a chamfered portion 91 is formed on the edge of the opening of the stop ring 9. The cutout portion 60 and the chamfered portion 91 engage with each other. This chamfered-to-cutout engagement relationship has the advantage of high reliability.

[0036] In order to facilitate the lead wire of the coil to pass through, in this embodiment, please refer to Figure 7 A second wiring groove 71 is provided on the bottom cover 7 , and the lead wire of the coil 4 passes through the second wiring groove 71 .

[0037] Furthermore, two outwardly protruding positioning protrusions 72 are formed on the edge of the bottom cover 7. In actual use, the electric toothbrush generally has an inner shell. In this embodiment, the bottom cover 7 is fixed to the bottom of the housing 1. When the motor is assembled on the inner shell of the electric toothbrush, the positioning protrusions 72 on the bottom cover 7 can be assembled and matched with the slots on the inner shell of the electric toothbrush, which not only facilitates the positioning of the motor but also ensures a reliable connection between the motor and the inner shell of the electric toothbrush.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric toothbrush motor, characterized in that: The invention comprises a shell (1), wherein a stator support (2), two iron cores (3), two coils (4) connected in series in sequence and a rotor (5) are arranged in the shell (1), the rotor (5) is arranged in the stator support (2) and a gap is formed between the two, a transmission shaft (6) is passed through the axis of the rotor (5), and the upper and lower ends of the transmission shaft (6) respectively extend to the outside of the shell (1), the side of the stator support (2) is provided with two symmetrically arranged avoidance openings (20), the upper and lower ends of the avoidance opening (20) are respectively formed with winding parts (21) protruding outward, the two iron cores (3) respectively cover the two avoidance openings (20), the coils (4) correspond to the iron cores (3) one by one, the iron core (3) is embedded between the upper and lower winding parts (21), and the coils (4) are wound around the upper and lower winding parts (21) and the outside of the iron core (3).

2. The electric toothbrush motor according to claim 1, wherein A winding groove (210) is formed between the winding portion (21) and the stator bracket (2), and accommodating grooves (30) are respectively formed on both sides of the iron core (3), the accommodating grooves (30) and the winding grooves (210) are communicated with each other, and the coil (4) is arranged in the winding grooves (210) and the accommodating grooves (30).

3. The electric toothbrush motor according to claim 2, wherein: The iron core (3) comprises an inner arc-shaped portion (31), an outer arc-shaped portion (32), and a connecting portion (33) located between the inner arc-shaped portion (31) and the outer arc-shaped portion (32); the accommodating groove (30) is formed between the inner arc-shaped portion (31) and the outer arc-shaped portion (32).

4. The electric toothbrush motor according to claim 3, wherein The two side edges of the avoidance opening (20) are respectively formed with first step portions (200), and the two side edges of the inner arc portion (31) are respectively formed with second step portions (310), and the second step portions (310) are aligned one by one with the first step portions (200) and are engaged with each other.

5. The electric toothbrush motor according to claim 1, wherein A first wiring groove (22) is formed on the outer side wall of the stator support (2), and the enameled wire connected between the two coils (4) passes through the first wiring groove (22).

6. The electric toothbrush motor according to claim 1, wherein A bottom cover (7) is fixed to the bottom of the housing (1), bearings (8) are embedded on the top of the housing (1) and the bottom cover (7), and the transmission shaft (6) passes through the upper and lower bearings (8).

7. The electric toothbrush motor according to claim 6, wherein: A limiting ring (9) is sleeved on the transmission shaft (6) and the two are engaged with each other, the limiting ring (9) includes two outwardly extending blocking arms (90), and two limiting blocks (70) are formed on the bottom cover (7), the blocking arms (90) correspond to the limiting blocks (70) one by one, and when the blocking arms (90) rotate to a preset angle, they abut against the limiting blocks (70).

8. The electric toothbrush motor according to claim 7, wherein: The outer side wall of the transmission shaft (6) is formed with a cut portion (60), and the opening edge of the limiting ring (9) is formed with a cut corner portion (91), and the cut portion (60) and the cut corner portion (91) are engaged with each other.

9. The electric toothbrush motor according to claim 7, wherein: A second wiring groove (71) is provided on the bottom cover (7), and the lead wire of the coil (4) passes through the second wiring groove (71).

10. The electric toothbrush motor according to claim 7, wherein Two outwardly protruding positioning protrusions (72) are formed on the edge of the bottom cover (7).

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