Motor output shaft assembly, motor and electric toothbrush

Abstract

The utility model discloses a motor output shaft assembly, a motor and an electric toothbrush. The first shaft sleeve and the second shaft sleeve are sleeved on the output shaft at an interval along the axial direction and are respectively welded and fixed with the output shaft; the fixed bearing comprises an inner ring and an outer ring; the inner ring sleeves the output shaft and is located between the first shaft sleeve and the second shaft sleeve, one end of the inner ring directly or indirectly abuts against the first shaft sleeve, and the other end of the inner ring directly or indirectly abuts against the second shaft sleeve; the magnetic marking assembly comprises a fixing frame and a magnetic attraction piece fixedly arranged on the fixing frame, and the fixing frame is provided with a connecting hole connected with the output shaft in a sleeving mode and is fixedly welded to the output shaft; the fixed outer cover is arranged on the outer ring in a sleeving manner; the fixed outer cover is welded and fixed with the outer ring; or the inner wall face of the fixed outer cover is provided with two limiting faces which are opposite in the axial direction, and the two limiting faces abut against the two axial ends of the outer ring respectively. According to the invention, the magnetic gap between the Hall sensor and the magnetic attraction piece can be better ensured, and the detection reliability of the rotation angle of the rotor is higher.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor output shaft assembly, a motor and an electric toothbrush. Background Art

[0002] The rotor is the rotating part of the motor. In order to achieve more precise and rapid control of the motor, one of the technical means is to detect the rotation angle of the rotor.

[0003] In the related technical scheme, a plurality of magnetic elements are fixedly provided on the rotor of the motor as magnetic markers, and the motor is equipped with a corresponding detection component, which includes a circuit board and a plurality of Hall sensors fixed to and electrically connected to the circuit board, and the Hall sensors are electromagnetically coupled with the magnetic elements on the rotor.

[0004] However, the detection accuracy of the rotation angle of the rotor needs to be based on the accuracy of the magnetic gap between the Hall sensor and the magnetic attraction member. The axial displacement of the rotor and the axial displacement of the magnetic attraction member will change the size of the magnetic gap.

[0005] In order to ensure that the magnetic gap remains constant, in the above technical solution, the rotor is fixed by interference fit between the inner ring of the relevant bearing and the motor output shaft and glue bonding; the magnetic suction component is fixed by a similar solution: the fixing frame is provided with a connecting hole that is sleeved with the output shaft, the connecting hole is interference fit with the motor output shaft and is fixed by glue bonding, and the magnetic suction component is fixed on the fixing frame.

[0006] However, in the above-mentioned technical solution, in applications with high-frequency forward and reverse rotation, such as forward and reverse rotation of more than 66,000 times / minute, the fixation between the inner ring of the bearing and the output shaft, and the fixation between the fixing frame and the output shaft are prone to failure, that is, the bearing and the fixing frame are loose relative to the output shaft. In particular, when the outer diameter of the output shaft is reduced, this failure is more likely to occur. However, reducing the outer diameter of the output shaft rotor mounting part and the fixing frame mounting part is to further adapt to the needs of high-frequency forward and reverse rotation. Because reducing the ratio of the rotor outer diameter to the axial dimension can reduce the moment of inertia, thereby reducing the difference between the actual angular displacement of the rotor and the target angular position. Therefore, in order not to increase the outer diameter of the rotor core and to facilitate the installation of the rotor magnet and the rotor core itself, such as the rivets between the laminated iron sheets, it is only necessary to reduce the inner hole that the rotor core and the output shaft are adapted to. Utility Model Content

[0007] The main purpose of the present application is to propose a rotor assembly, which aims to solve the technical problem that the existing motor output shaft assembly is difficult to ensure the accuracy of the magnetic gap between the Hall sensor and the magnetic attraction component.

[0008] To achieve the above-mentioned purpose, the motor output shaft assembly proposed in the present application includes:

[0009] Output shaft;

[0010] A first sleeve and a second sleeve are sleeved on the output shaft at intervals in the axial direction and are respectively welded and fixed to the output shaft;

[0011] A fixed bearing, comprising an inner ring and an outer ring rotatable relative to the inner ring; the inner ring is sleeved on the output shaft and located between the first sleeve and the second sleeve, one end of the inner ring directly or indirectly abuts against the first sleeve, and the other end directly or indirectly abuts against the second sleeve;

[0012] A magnetic marker assembly, comprising a fixing frame and a magnetic attraction member fixed on the fixing frame, wherein the fixing frame is provided with a connection hole sleeved with the output shaft, and the fixing frame is fixed to the output shaft by welding; and

[0013] A fixed outer cover is sleeved on the outer ring; the fixed outer cover is fixed to the outer ring by welding; or the inner wall surface of the fixed outer cover has two axially opposite limiting surfaces, and the two limiting surfaces are respectively abutted against the axial ends of the outer ring.

[0014] Preferably, the second sleeve is a part of the fixing frame, and the fixing frame further comprises a bottom plate connected to the outer peripheral surface of the second sleeve, and the magnetic attraction member is in contact with a surface of the bottom plate which faces away from the fixed bearing.

[0015] Preferably, the base plate extends around the second sleeve and is annular, the fixing frame further comprises an outer flange extending from the outer edge of the base plate away from the fixed bearing, the outer flange is annular; the magnetic attraction member is fixedly embedded between the outer flange and the second sleeve.

[0016] Preferably, the fixing frame further comprises an inner flange arranged at one end of the second sleeve away from the fixed bearing, the inner flange extending radially inward from the second sleeve and being annular; the inner side surface of the inner flange abuts against the end surface of the output shaft; the inner edge of the inner flange is welded and fixed to the output shaft.

[0017] Preferably, one end of the second sleeve away from the fixed bearing is welded and fixed to the output shaft.

[0018] Preferably, the fixed outer cover includes a shell, the shell includes a fixed cylinder and a flange, the flange is radially protruded outward from one end of the fixed cylinder on the outer circumferential surface of the fixed cylinder, and the flange is provided with a first fixing hole; the fixed bearing is arranged in the inner cavity of the fixed cylinder, and the outer ring is welded and fixed to the flange.

[0019] Preferably, the fixed outer cover includes a shell and a cover body, the shell has a receiving groove open to one side, the cover body covers the receiving groove to form a bearing chamber for accommodating the fixed bearing, and the cover body is provided with a through hole for the output shaft to pass through; the shell and the cover body are welded and fixed, and the circumferential ends of the outer ring are respectively abutted against the shell and the cover body.

[0020] Preferably, the shell includes a fixing cylinder and a flange, wherein the flange is protruded radially outward from one end of the fixing cylinder on the outer peripheral surface of the fixing cylinder, and the flange is overlapped with the cover body and fixed by welding.

[0021] Preferably, a convex point is formed on a side of the cover body facing the flange, and the convex point is fixed to the flange by welding.

[0022] Preferably, the output shaft includes a first shaft section and a second shaft section, the outer diameter of the first shaft section is larger than the outer diameter of the second shaft section, the first shaft sleeve, the second shaft sleeve, the fixed bearing and the fixed frame are all arranged on the second shaft section; the output shaft assembly also includes a balancing bearing installed on the first shaft section.

[0023] Preferably, the outer diameter of the second shaft segment is between 2.5 mm and 3 mm.

[0024] The present application also proposes a motor, including a housing, a stator, a rotor and an output shaft assembly, the motor also including a detection assembly, the output shaft assembly is the motor output shaft assembly described above; the detection assembly includes a circuit board and a plurality of Hall sensors fixed to and electrically connected to the circuit board, the Hall sensors being electromagnetically coupled to the magnetic attraction component.

[0025] Preferably, the housing comprises a first end, a second end and a cylindrical body extending between the first end and the second end, wherein:

[0026] The inner wall surface of the first end has an end wall surface for axial limiting, and the second end is formed with an assembly opening opposite to the end wall surface;

[0027] The assembly opening is used for the stator, rotor and output shaft assembly to pass through and be installed into the inner cavity of the main body; the stator and output shaft assembly are respectively limitedly matched with the end wall surface; the first sleeve, the second sleeve, the fixed bearing and the fixed frame are all arranged adjacent to the assembly opening.

[0028] Preferably, the first end includes a connecting plate, a limiting cylinder and a flange, wherein:

[0029] The connecting plate extends radially inward from an end of the main body away from the second end and is annular;

[0030] The limiting cylinder is formed by extending from the inner edge of the connecting plate in the axial direction away from the second end;

[0031] The flange is formed by folding inwardly from one end of the limiting cylinder away from the connecting plate;

[0032] The end wall surface includes a first wall surface formed on the connecting plate and a second wall surface formed on the flange;

[0033] The output shaft assembly is a motor output shaft assembly in which the output shaft includes a first shaft section and a second shaft section, the stator abuts against the first wall surface, and the balance bearing is arranged in the inner cavity of the limiting cylinder and abuts against the second wall surface.

[0034] Preferably, the motor also includes a fixing plate sleeved on the periphery of the limiting cylinder, the fixing plate is attached to the outer side surface of the connecting plate and is welded and fixed to the casing, the thickness of the fixing plate is greater than the thickness of the casing, and a second fixing hole is provided on the side of the fixing plate facing away from the connecting plate.

[0035] The present application also proposes an electric toothbrush, comprising a handle, a motor and a brush head, wherein the motor is disposed in an inner cavity of the handle, the output shaft of the motor extends out of the front end of the handle, the brush head is installed at the front end of the output shaft, and the motor is the motor as described above.

[0036] The motor output shaft assembly of the utility model is achieved by directly or indirectly clamping the inner ring of the fixed bearing between the first sleeve and the second sleeve, and the first sleeve and the second sleeve are both welded and fixed to the output shaft. Therefore, the inner ring of the fixed bearing is reliably fixed, even if the outer diameter of the output shaft is small and the moment of inertia of the rotor is large; the outer ring of the fixed bearing is fixed by a fixed outer cover or limited on both sides along the axial direction, so the outer ring is not easy to move relative to the fixed outer cover; thus, the fixed bearing is not easy to move axially relative to the output shaft, nor is it easy to move axially relative to the housing of the motor. In addition, since the fixed frame of the magnetic marker assembly is directly welded and fixed to the output shaft, the magnetic attraction member on the fixed frame is not easy to move axially relative to the output shaft. Therefore, the magnetic gap between the Hall sensor of the detection assembly and the magnetic attraction member is not easy to change, thereby ensuring the detection accuracy of the rotor rotation angle of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1It is a three-dimensional structural schematic diagram of the first embodiment of the motor of the utility model;

[0039] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the motor from the bottom perspective;

[0040] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the motor;

[0041] Figure 4 for Figure 3 Schematic diagram of the exploded structure of the local structure of the output shaft assembly of the motor;

[0042] Figure 5 for Figure 1 Schematic diagram of the exploded structure of the motor from another angle;

[0043] Figure 6 for Figure 5 Schematic diagram of the exploded structure of the local structure of the output shaft assembly of the motor;

[0044] Figure 7 for Figure 1 A front view schematic diagram of the structure of the motor;

[0045] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure along line VIII-VIII;

[0046] Fig. 9 for Figure 8 A schematic diagram of the local enlarged structure at point A in the middle;

[0047] Fig.10 for Figure 8 A schematic diagram of the local enlarged structure at B in the middle;

[0048] Fig.11 It is a front structural schematic diagram of the second embodiment of the motor of the utility model;

[0049] Fig.12 for Fig.11 A schematic diagram of the cross-sectional structure along line XII-XII;

[0050] Fig.13 for Fig.12 A schematic diagram of the local enlarged structure at C in the middle;

[0051] Fig.14 for Fig.12 A schematic diagram of the local enlarged structure at D in the middle;

[0052] Fig.15 for Fig.14 Schematic diagram of the three-dimensional structure of the middle fixing frame.

[0053] Description of Figure Numbers:

[0054] Label name Label name Label name 100A Motor 12 Second shaft section 56 Cover 100B Motor 20 First bushing 57 Bump 200 chassis 30 Fixed bearing 58 Bearing chamber 210 First End 31 Inner Circle 60 Balance bearing 211 End wall surface 32 Outer ring 600 Output shaft assembly 212 First wall 40 Magnetic labeling components 70 Magnetic labeling components 213 Second wall 41 Fixed bracket 71 Fixed bracket 214 Connecting plate 42 Second bushing 72 Second bushing 215 Limit cylinder 43 Base Plate 73 Base Plate 216 Flanging 44 Outer flange 74 Inner flange 220 Second end 45 Magnetic parts 75 Magnetic parts 221 Assembly port 50 Fixed cover 700 Detection components 230 main body 51a, 51b Limiting surface 701 Circuit Board 300 stator 52 case 702 Hall sensor 400 Rotor 53 Fixed cylinder 800 Fixed plate 500 Output shaft assembly 531 Storage tank 801 Second fixing hole 10 Output shaft 54 Flange 11 First shaft section 541 First fixing hole DETAILED DESCRIPTION

[0055] 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.

[0056] Reference Figures 1 to 4 , Figures 7 to 14 In the first and second implementations, the motor output shaft assembly 500, 600 proposed in the present application includes:

[0057] Output shaft 10;

[0058] The first sleeve 20 and the second sleeve 42 and 72 are sleeved on the output shaft 10 at intervals in the axial direction and are respectively welded and fixed to the output shaft 10;

[0059] The fixed bearing 30 includes an inner ring 31 and an outer ring 32 rotatable relative to the inner ring 31; the inner ring 31 is sleeved on the output shaft 10 and located between the first sleeve 20 and the second sleeve 42, 72, one end of the inner ring 31 directly or indirectly abuts against the first sleeve 20, and the other end directly or indirectly abuts against the second sleeve 42, 72;

[0060] The magnetic marker assembly 40, 70 comprises a fixing frame 41, 71 and a magnetic attraction member 45, 75 fixed on the fixing frame 41, 71, wherein the fixing frame 41, 71 is provided with a connecting hole sleeved with the output shaft 10, and the fixing frame 41, 71 is fixed to the output shaft 10 by welding; and

[0061] The fixed outer cover 50 is sleeved on the outer ring 32; the fixed outer cover 50 is welded and fixed to the outer ring 32; or the inner wall surface of the fixed outer cover 50 has two axially opposite limiting surfaces 51a, 51b, and the two limiting surfaces 51a, 51b are respectively abutted against the axial ends of the outer ring 32.

[0062] In this embodiment, the output shaft 10 is used to output the power of the rotor 400, and the outer end can be connected to a working part, such as a toothbrush head. The first sleeve 20 and the second sleeve 42, 72 are used for limiting or fixing. The fixed bearing 30 is used to reduce the rotational resistance and is also used to fix the output shaft 10, that is, the output shaft 10 is also fixed by the fixed bearing 30. Since the magnetic suction parts 45, 75 are usually supported by brittle materials, they are not suitable for being directly fixed to the output shaft 10; by setting a fixing frame 41, 71 to fix the magnetic suction parts 45, 75, it is possible to ensure that the magnetic suction parts 45, 75 are fixed while avoiding damage to the magnetic suction parts 45, 75. The fixing frame 41, 71 can be a simple flat plate or a disc-shaped structure with a mounting groove. The magnetic suction parts 45, 75 are used to magnetically couple with the Hall sensor 702 of the detection component 700 to provide a feedback signal about the rotation angle of the rotor 400. The fixed outer cover 50 is used to fix the outer ring 32 of the fixed bearing 30. The fixed outer cover 50 itself can be directly or indirectly fixedly connected to the housing 200 of the motor 100A, 100B, or the fixed outer cover 50 can be directly or indirectly fixedly connected to the handle bracket. In order to facilitate welding, the output shaft 10, the first sleeve 20, the second sleeve 42, 72 and the fixing frame 41, 71 can all be made of the same material, such as stainless steel. When the fixed outer cover 50 is welded and fixed to the outer ring 32, the fixed outer cover 50 can be made of the same or similar material as the outer ring 32.

[0063] It is understandable that in the motor 100A, 100B provided with the detection assembly 700, the position of the detection assembly 700 is fixed and easy to ensure, therefore, the axial movement of the output shaft 10, or the axial movement of the fixing bracket 41, 71 relative to the output shaft 10 will cause the magnetic gap between the Hall sensor 702 and the magnetic attraction member 45, 75 to change, and the axial fixation of the output shaft 10 depends on the fixation of the fixed bearing 30. In other words, the magnetic gap has two major influencing factors, one is the fixation of the fixed bearing 50, and the other is the fixation of the fixed bracket 41, 71.

[0064] The motor output shaft assembly 500, 600 of the utility model is achieved by directly or indirectly clamping the inner ring 31 of the fixed bearing 30 between the first sleeve 20 and the second sleeve 42, 72, and the first sleeve 20 and the second sleeve 42, 72 are welded and fixed to the output shaft 10. Therefore, the inner ring 31 of the fixed bearing 30 is reliably fixed, even if the outer diameter of the output shaft 10 is small and the moment of inertia of the rotor 400 is large; the outer ring 32 of the fixed bearing 30 is fixed by the fixed outer cover 50 or the limiting surfaces 51a, 51b of the fixed outer cover 50 are limited on both sides along the axial direction, so the outer ring 32 is not easy to move relative to the fixed outer cover 50; thus, the fixed bearing 30 is not easy to move axially relative to the output shaft 10, and is not easy to move axially relative to the housing 200 of the motor 100A, 100B. In addition, since the fixing frames 41, 71 of the magnetic marker assemblies 40, 70 are directly welded and fixed to the output shaft 10, the magnetic attracting members 45, 75 on the fixing frames 41, 71 are not easy to move axially relative to the output shaft 10. Therefore, the magnetic gap between the Hall sensor 702 of the detection assembly 700 and the magnetic attracting members 45, 75 is not easy to change, thereby ensuring the detection accuracy of the rotation angle of the rotor 400 of the motor 100A, 100B.

[0065] Furthermore, the second sleeve 42, 72 is a part of the fixing frame 41, 71, which reduces the number of parts, reduces processing costs, and improves the convenience of assembly. The fixing frame 41, 71 also includes a base plate 43, 73 connected to the outer peripheral surface of the second sleeve 42, 72, and the magnetic member 45, 75 is bonded to the side of the base plate 43, 73 away from the fixed bearing 30. The bonding of the base plate 43, 73 and the magnetic member 45, 75 can expand the contact area between the fixing frame 41, 71 and the magnetic member 45, 75, thereby facilitating fixation. Specifically, the magnetic member 45, 75 can be fixed to the base plate 43, 73 by gluing.

[0066] Further, refer to Figures 3 to 6 , Figures 8 to 10 In the first embodiment, the bottom plate 43 extends around the second sleeve 42 and is annular. The fixing frame 41 also includes an outer flange 44 extending from the outer edge of the bottom plate 43 away from the fixed bearing 30. The outer flange 44 is annular. The magnetic attraction member 45 is fixedly embedded between the outer flange 44 and the second sleeve 42.

[0067] In this embodiment, the outer flange 44 can wrap the magnetic element 45 from the outside, so that even if the magnetic element 45 is broken, it will not be separated from the fixing frame 41 due to the centrifugal force generated by the high-speed rotation.

[0068] Further, refer to Figures 12 to 15In the second embodiment, the fixing frame 71 further comprises an inner flange 74 provided at one end of the second sleeve 72 away from the fixed bearing 30, the inner flange 74 extends radially inward from the second sleeve 42, 72 and is annular; the inner side surface of the inner flange 74 abuts against the end surface of the output shaft 10; the inner edge of the inner flange 74 is welded and fixed to the output shaft 10.

[0069] In this embodiment, on the one hand, the inner flange 74 can provide a positioning surface for the installation of the fixing frame 71 to ensure the axial position of the fixing frame 71; on the other hand, the inner edge of the inner flange 74 is welded to the output shaft 10, which can prevent the high temperature generated at the welding point between the fixing frame 71 and the output shaft 10 from being quickly transmitted to the magnetic attraction component 75, thereby preventing the demagnetization or damage of the magnetic attraction component 75 due to the high welding temperature.

[0070] Further, refer to Fig.10 In the first embodiment, the end of the second sleeve 42 away from the fixed bearing 30 is welded and fixed to the output shaft 10. Since there is no obstruction from the fixed bearing 30, the welding operation space of the second sleeve 42 is larger, or the welding operation is easier to perform. In addition, since the welding point is away from the inner ring 31 of the fixed bearing 30, the inner ring 31 is not easily affected by the high temperature of the welding point, which is more conducive to ensuring the structural accuracy of the fixed bearing 30 and keeping the rolling friction of the fixed bearing 30 at a low level.

[0071] Further, refer to Figures 3 to 6 , Fig.10 or Fig.14 In the first or second embodiment, the fixed outer cover 50 includes a shell 52, the shell 52 includes a fixed tube 53 and a flange 54, the flange 54 is radially protruded outward from one end of the fixed tube 53 on the outer circumferential surface of the fixed tube 53, and the flange 54 is provided with a first fixing hole 541; the fixed bearing 30 is arranged in the inner cavity of the fixed tube 53, and the outer ring 32 is welded and fixed to the flange 54.

[0072] In this embodiment, the housing 52 is divided into two parts, wherein the fixing cylinder 53 is used to accommodate the fixed bearing 30, so that the fixed bearing 30 is more fully covered, so that the installation is more stable; at the same time, it is also convenient for the outer ring 32 of the fixed bearing 30 to be aligned with the flange 54 and convenient for welding the two. The flange 54 is provided with a first fixing hole 541, which is conducive to the fixing of the outer periphery itself or the installation of other parts, such as the detection assembly 700 of the following embodiment.

[0073] Furthermore, the fixed outer cover 50 includes a shell 52 and a cover body 56, the shell 52 has a receiving groove 531 open to one side, the cover body 56 covers the receiving groove 531 to form a bearing chamber 58 for receiving the fixed bearing 30, and the cover body 56 is provided with a through hole for the output shaft 10 to pass through; the shell 52 and the cover body 56 are welded and fixed, and the circumferential ends of the outer ring 32 are respectively abutted against the shell 52 and the cover body 56.

[0074] In this embodiment, the fixed outer cover 50 includes a separate shell 52 and a cover 56, so that it is convenient to assemble the fixed bearing 30 while realizing the axial double-sided limitation of the outer ring 32 of the fixed bearing 30; in addition, since the shell 52 and the cover 56 are welded and fixed, compared with the shell 52 and the outer ring 32 of the fixed bearing 30 being welded and fixed, the deformation or metallographic change of the outer ring 32 caused by the high temperature of welding can be avoided, thereby better ensuring the performance and reliability of the fixed bearing 30.

[0075] Furthermore, the shell 52 includes a fixing tube 53 and a flange 54 . The flange 54 is radially protruded outward from one end of the fixing tube 53 on the outer peripheral surface of the fixing tube 53 . The flange 54 is overlapped with the cover body 56 and fixed by welding.

[0076] In this embodiment, the flange 54 and the cover body 56 overlap to facilitate positioning and assembly, and can also provide a larger range of optional areas for welding and fixing.

[0077] Furthermore, a convex point 57 is formed on one side of the cover 56 facing the flange 54, and the convex point 57 is welded to the flange 54. In this embodiment, the convex point 57 can reduce the contact area between the cover 56 and the flange 54, so that a greater resistance can be formed in a local area during welding, thereby generating greater heat.

[0078] Further, refer to Figure 3 , Figure 5 , Figures 8 to 10 or Figure 12 to Figure 14 In the first or second embodiment, the output shaft 10 includes a first shaft section 11 and a second shaft section 12, the outer diameter of the first shaft section 11 is greater than the outer diameter of the second shaft section 12, the first shaft sleeve 20, the second shaft sleeve 42, 72, the fixed bearing 30 and the fixing frame 41, 71 are all arranged on the second shaft section 12; the output shaft 10 assembly 500 also includes a balancing bearing 60 installed on the first shaft section 11.

[0079] In this embodiment, reducing the outer diameter of the second shaft section 12 is beneficial to provide a larger installation space for the rotor 400, so that the rotor 400 can further reduce the moment of inertia generated during forward and reverse rotation while ensuring the preset driving force. Preferably, the outer diameter of the second shaft section 12 is between 2.5 mm and 3 mm.

[0080] Reference Figures 1 to 3 , Figure 5 , Figures 7 and 8 , Fig.10 or Fig.11 , Fig.12 and Fig.14The present application also proposes a motor 100A, 100B, including a housing 200, a stator 300, a rotor 400 and an output shaft 10 assembly 500. The motor 100A, 100B also includes a detection assembly 700. The output shaft 10 assembly 500 is the motor output shaft assembly 500, 600 described above; the detection assembly 700 includes a circuit board 701 and a plurality of Hall sensors 702 fixed and electrically connected to the circuit board 701, and the Hall sensors 702 are electromagnetically coupled to the magnetic suction members 45, 75. The specific structure of the motor output shaft assembly 500, 600 refers to the above embodiments. Since the present motor 100A, 100B adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0081] In this embodiment, the housing 200 is used to fix the stator 300 and provide protection for its internal components. The housing 200 is usually made of metal, so that it can not only achieve dustproof but also shield the environmental electric field or magnetic field. The stator 300 is provided with a coil, such as a three-phase coil, which drives the rotor 400 to rotate by generating a changing electromagnetic field. The output shaft 10 is used to transmit the power of the rotor 400 to the outside, for example, to the action parts installed on the outer end of the output shaft 10, such as a toothbrush head. The motors 100A and 100B of this embodiment are provided with magnetic suction parts 45 and 75 on the output shaft 10 component 500, and corresponding Hall sensors 702 are provided in the detection component 700, so that the rotation angle of the rotor 400 can be accurately detected by using a linear Hall algorithm, thereby facilitating the implementation of a fast forward and reverse "sweep vibration" algorithm.

[0082] Further, please refer to Fig. 9 or Fig.13 The housing 200 includes a first end 210, a second end 220, and a cylindrical body 230 extending between the first end 210 and the second end 220, wherein:

[0083] The inner wall surface of the first end 210 has an end wall surface 211 for axial limiting, and the second end 220 is formed with an assembly opening 221 opposite to the end wall surface 211;

[0084] The assembly opening 221 is used for the stator 300, the rotor 400 and the output shaft 10 assembly 500 to pass through and be installed into the inner cavity of the main body 230; the stator 300 and the output shaft 10 assembly 500 are respectively limitedly matched with the end wall surface 211; the first sleeve 20, the second sleeve 42, 72, the fixed bearing 30 and the fixing frame 41, 71 are all arranged adjacent to the assembly opening 221.

[0085] In this embodiment, the housing 200 provides an end wall 211 at the first end 210 so as to provide support and unilateral axial limitation at the same time. The adjacent assembly arrangement of the fixing frame 41, 71 etc. can improve the convenience of assembly.

[0086] Furthermore, the first end 210 includes a connecting plate 214, a limiting cylinder 215 and a flange 216, wherein:

[0087] The connecting plate 214 extends radially inward from an end of the main body 230 away from the second end 220 and is annular;

[0088] The limiting cylinder 215 is formed by extending from the inner edge of the connecting plate 214 axially away from the second end 220;

[0089] The flange 216 is formed by folding inwardly from one end of the limiting tube 215 away from the connecting plate 214;

[0090] The end wall surface 211 includes a first wall surface 212 formed on the connecting plate 214 and a second wall surface 213 formed on the flange 216;

[0091] The output shaft 10 assembly 500 is a motor output shaft assembly 500 , 600 in which the output shaft 10 includes a first shaft section 11 and a second shaft section 12 . The stator 300 abuts against the first wall surface 212 , and the balance bearing 60 is disposed in the inner cavity of the limiting cylinder 215 and abuts against the second wall surface 213 .

[0092] In this embodiment, the first wall 212 and the second wall 213 of the first end 210 are respectively formed on the connecting plate 214 and the flange 216, which not only allows the stator 300 and the balance bearing 60 to be axially limited, but also facilitates the formation of a step-shaped recess between the connecting plate 214 and the limiting cylinder 215, thereby reducing the installation space required for the motors 100A, 100B.

[0093] Furthermore, the motors 100A and 100B also include a fixing plate 800 which is sleeved on the periphery of the limiting cylinder 215. The fixing plate 800 is attached to the outer side surface of the connecting plate 214 and is welded and fixed to the housing 200. The thickness of the fixing plate 800 is greater than the thickness of the housing 200. A second fixing hole 801 is provided on a side of the fixing plate 800 which is away from the connecting plate 214.

[0094] In this embodiment, the housing 200 can be stably installed while adopting a thin-walled structure by providing the fixing plate 800. For example, by using a fastener to pass through the handle bracket of the handheld device, the housing 200 can be indirectly fixed to the handle bracket.

[0095] Reference Figure 1 or Fig.11The present application also proposes an electric toothbrush (not shown), including a handle, a motor 100A, 100B and a brush head. The motors 100A, 100B are arranged in the inner cavity of the handle. The output shaft 10 of the motors 100A, 100B extends out of the front end of the handle. The brush head is installed at the front end of the output shaft 10. The motors 100A, 100B are the motors 100A, 100B described above. In this embodiment, the handle is used for the user to hold when in use, so as to facilitate operation. The motors 100A, 100B are used to provide power for the working parts, such as the toothbrush head. The brush head achieves brushing of teeth or oral tissues through its own movement. The specific structure of the motors 100A, 100B refers to the above embodiments. Since the electric toothbrush adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor output shaft assembly, characterized in that: include: Output shaft; A first sleeve and a second sleeve are sleeved on the output shaft at intervals in the axial direction and are respectively welded and fixed to the output shaft; A fixed bearing, comprising an inner ring and an outer ring rotatable relative to the inner ring; the inner ring is sleeved on the output shaft and located between the first sleeve and the second sleeve, one end of the inner ring directly or indirectly abuts against the first sleeve, and the other end directly or indirectly abuts against the second sleeve; A magnetic marker assembly, comprising a fixing frame and a magnetic attraction member fixed on the fixing frame, wherein the fixing frame is provided with a connection hole sleeved with the output shaft, and the fixing frame is fixed to the output shaft by welding; and A fixed outer cover is sleeved on the outer ring; the fixed outer cover is fixed to the outer ring by welding; or the inner wall surface of the fixed outer cover has two axially opposite limiting surfaces, and the two limiting surfaces are respectively abutted against the axial ends of the outer ring.

2. The motor output shaft assembly according to claim 1, characterized in that: The second sleeve is a part of the fixing frame, and the fixing frame further comprises a bottom plate connected to the outer peripheral surface of the second sleeve, and the magnetic attraction member is in contact with a surface of the bottom plate which faces away from the fixed bearing.

3. The motor output shaft assembly according to claim 2, characterized in that: The base plate extends around the second sleeve and is annular. The fixing frame also includes an outer flange extending from the outer edge of the base plate away from the fixed bearing, and the outer flange is annular. The magnetic attraction member is fixedly embedded between the outer flange and the second sleeve.

4. The motor output shaft assembly according to claim 2 or 3, characterized in that: The fixing frame also includes an inner flange arranged at one end of the second sleeve away from the fixed bearing, the inner flange extends radially inward from the second sleeve and is annular; the inner side surface of the inner flange abuts against the end surface of the output shaft; the inner edge of the inner flange is welded and fixed to the output shaft.

5. The motor output shaft assembly according to any one of claims 1 to 3, characterized in that: One end of the second sleeve away from the fixed bearing is welded and fixed to the output shaft.

6. The motor output shaft assembly according to claim 1, characterized in that: The fixed outer cover includes a shell, and the shell includes a fixed cylinder and a flange. The flange is radially protruded outward from one end of the fixed cylinder on the outer circumferential surface of the fixed cylinder, and the flange is provided with a first fixing hole; the fixed bearing is arranged in the inner cavity of the fixed cylinder, and the outer ring is welded and fixed to the flange.

7. The motor output shaft assembly according to claim 1, characterized in that: The fixed outer cover includes a shell and a cover body, the shell has a receiving groove open to one side, the cover body covers the receiving groove to form a bearing chamber for receiving the fixed bearing, and the cover body is provided with a through hole for the output shaft to pass through; the shell and the cover body are welded and fixed, and the circumferential ends of the outer ring are respectively abutted against the shell and the cover body.

8. The motor output shaft assembly according to claim 7, characterized in that: The shell includes a fixing tube and a flange. The flange is radially protruded outward from one end of the fixing tube on the outer peripheral surface of the fixing tube. The flange is overlapped with the cover body and fixed by welding.

9. The motor output shaft assembly according to claim 8, characterized in that: A convex point is formed on one side of the cover body facing the flange, and the convex point is welded and fixed to the flange.

10. The motor output shaft assembly according to any one of claims 1 to 3, and 6 to 9, characterized in that: The output shaft includes a first shaft section and a second shaft section, the outer diameter of the first shaft section is larger than the outer diameter of the second shaft section, the first shaft sleeve, the second shaft sleeve, the fixed bearing and the fixed frame are all arranged on the second shaft section; the output shaft assembly also includes a balancing bearing installed on the first shaft section.

11. The motor output shaft assembly according to claim 10, characterized in that: The outer diameter of the second shaft segment is between 2.5 mm and 3 mm.

12. A motor, comprising a housing, a stator, a rotor and an output shaft assembly, characterized in that: The motor also includes a detection component, and the output shaft component is the motor output shaft component according to any one of claims 1 to 9; the detection component includes a circuit board and a plurality of Hall sensors fixed to and electrically connected to the circuit board, and the Hall sensors are electromagnetically coupled to the magnetic attraction component.

13. The motor according to claim 12, characterized in that The housing includes a first end, a second end, and a cylindrical body extending between the first end and the second end, wherein: The inner wall surface of the first end has an end wall surface for axial limiting, and the second end is formed with an assembly opening opposite to the end wall surface; The assembly opening is used for the stator, rotor and output shaft assembly to pass through and be installed into the inner cavity of the main body; the stator and output shaft assembly are respectively limitedly matched with the end wall surface; the first sleeve, the second sleeve, the fixed bearing and the fixed frame are all arranged adjacent to the assembly opening.

14. The motor according to claim 13, characterized in that The first end includes a connecting plate, a limiting cylinder and a flange, wherein: The connecting plate extends radially inward from an end of the main body away from the second end and is annular; The limiting cylinder is formed by extending from the inner edge of the connecting plate in the axial direction away from the second end; The flange is formed by folding inwardly from one end of the limiting cylinder away from the connecting plate; The end wall surface includes a first wall surface formed on the connecting plate and a second wall surface formed on the flange; The output shaft assembly is the motor output shaft assembly according to claim 10 or 11, the stator abuts against the first wall surface, and the balance bearing is arranged in the inner cavity of the limiting cylinder and abuts against the second wall surface.

15. The motor according to claim 14, characterized in that The motor also includes a fixing plate sleeved on the periphery of the limiting cylinder, the fixing plate is attached to the outer side surface of the connecting plate and is welded and fixed to the casing, the thickness of the fixing plate is greater than the thickness of the casing, and a second fixing hole is provided on a side of the fixing plate away from the connecting plate.

16. An electric toothbrush, comprising a handle, a motor and a brush head, wherein the motor is arranged in the inner cavity of the handle, the output shaft of the motor extends out of the front end of the handle, and the brush head is installed at the front end of the output shaft, characterized in that: The motor is a motor as claimed in any one of claims 12 to 15.

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