Linear motor and electric toothbrush

Abstract

The utility model discloses a linear motor and electric toothbrush, including casing, stator subassembly, mover subassembly and shock-absorbing subassembly, stator subassembly and shock-absorbing subassembly are provided in the casing, stator subassembly drives mover subassembly to move, shock-absorbing subassembly includes first shrapnel and balancing weight, one end of first shrapnel is located in the casing, the other end of first shrapnel is located in the casing, and the other end of first shrapnel is located in the casing. The other end of the first elastic piece is connected with a balancing weight, and the moving direction of the rotor assembly and the direction in which the balancing weight moves to drive the first elastic piece to deform are located on the same straight line. According to the linear motor, the damping assembly is arranged in the linear motor, vibration generated by the linear motor in the moving direction is reduced or eliminated in the mode that the balancing weight is positioned through the first elastic piece, vibration generated by the electric product is reduced or eliminated in the linear motor, the vibration sense of the electric product in the using process can be effectively reduced, and the user experience is improved.

Description

Technical Field

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

[0002] Electric toothbrushes use linear motors to achieve high-frequency linear reciprocating motion. Common linear motors used in electric toothbrushes are magnetically levitated linear motors, which generate high-frequency linear reciprocating motion through the interaction between the permanent magnets in the mover and the energized coils in the stator. This also causes significant vibration during operation, affecting the user's experience with the handheld toothbrush. Summary of the Invention

[0003] The utility model provides a linear motor and an electric toothbrush, aiming to solve the problem that the existing linear motor vibrates greatly during operation.

[0004] According to an embodiment of the present application, a linear motor is provided, comprising a housing, a stator assembly, a mover assembly and a shock-absorbing assembly; the stator assembly and the shock-absorbing assembly are arranged in the housing, and the stator assembly drives the mover assembly to move; the shock-absorbing assembly comprises a first spring sheet and a counterweight block, one end of the first spring sheet is positioned in the housing, and the other end of the first spring sheet is connected to the counterweight block; the moving direction of the mover assembly and the direction in which the counterweight block moves to drive the first spring sheet to deform are located on the same straight line.

[0005] Preferably, the movable subassembly includes a second spring piece, a moving part and a moving shaft, the moving shaft is arranged at one end of the moving part in the moving direction; one end of the second spring piece is positioned on the housing, and the other end of the second spring piece is connected to the moving shaft; the second spring piece is connected to at least one end of the moving shaft; the moving part is arranged at the top of the stator assembly, and a magnet is positioned on the side of the moving shaft close to the stator assembly.

[0006] Preferably, the movable shaft passes through the counterweight block and the first elastic piece and extends outward; the movable shaft and the counterweight block are coaxially arranged.

[0007] Preferably, the number of the second elastic pieces is at least two, and the at least two second elastic pieces are respectively arranged at both ends of the moving axis in the moving direction.

[0008] Preferably, the number of the shock absorbing assemblies is at least two, and the at least two shock absorbing assemblies are respectively arranged at two ends of the housing corresponding to the moving direction of the mover assembly; the stator assembly is arranged between the at least two shock absorbing assemblies.

[0009] Preferably, the number of the counterweight blocks is two, and the two counterweight blocks are symmetrically arranged relative to the first elastic sheet.

[0010] Preferably, the first elastic piece includes a first end, a middle section and a second end connected in sequence, the first end is connected to the housing, and the second end is connected to the counterweight; the middle section is an arc segment.

[0011] Preferably, the end of the first end is plugged into the side wall of the housing, and the bottom of the first end is plugged into the bottom of the housing; the two counterweights are respectively arranged on two opposite side surfaces of the second end.

[0012] Preferably, the top of the casing is an open structure.

[0013] The utility model also provides an electric toothbrush, comprising any one of the linear motors described above.

[0014] Compared with the prior art, the linear motor and electric toothbrush provided by the present invention have the following beneficial effects:

[0015] 1. By setting a shock-absorbing component inside the linear motor and positioning the counterweight block through the first spring piece, the vibration generated by the linear motor in the moving direction is reduced or eliminated, so that the vibration generated by the electric product is reduced or eliminated inside the linear motor, which can effectively reduce the vibration during the use of the electric product and improve the user experience.

[0016] 2. By arranging the movable shaft and the counterweight block coaxially, the movable shaft can accurately reduce or eliminate the vibration of the casing caused by the reciprocating motion of the movable shaft based on the coaxial swinging counterweight block during the operation of the motor.

[0017] 3. By placing the damping components at both ends of the housing, the counterweights create a uniform force on both ends of the linear motor, improving overall motor installation stability and force uniformity. Furthermore, the damping components at both ends effectively control housing vibration. The damping force generated by the elastic oscillation of the two counterweights acts evenly on the housing, providing enhanced vibration reduction.

[0018] 4. By arranging the two counterweights symmetrically relative to the second end, the first elastic piece is provided with counterweights of the same mass in both directions of elastic deformation, thereby improving the force balance of the first elastic piece.

[0019] 5. The open structure on the top of the casing can make the assembly of the linear motor more convenient, improve the heat dissipation efficiency of the entire motor, and reduce the weight of the motor. The lighter casing can make the shock absorption effect of the shock absorption module better and improve the shock absorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] FIG1 is a schematic structural diagram of a linear motor provided by the first embodiment of the present invention.

[0022] FIG2 is a schematic diagram of the exploded structure of the linear motor provided in the first embodiment of the present invention.

[0023] FIG3 is a schematic diagram of the exploded structure of the linear motor provided by the first embodiment of the present invention from another angle.

[0024] FIG4 is a schematic structural diagram of a shock absorbing assembly in a linear motor provided by the first embodiment of the present utility model.

[0025] Figure 5 This is a schematic diagram of the internal structure of the electric toothbrush provided in the second embodiment of the present utility model.

[0026] Description of labels:

[0027] 1. Casing;

[0028] 2. stator assembly; 21. iron core; 22. coil;

[0029] 3. Moving element assembly; 31. Second spring; 32. Moving element; 33. Moving shaft;

[0030] 4. Shock-absorbing assembly; 41. First spring; 411. First end; 412. Middle section; 413. Second end; 42. Counterweight;

[0031] 100. Magnet; 200. Electric toothbrush. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0034] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] Please combine Figure 1 、 Figure 2 and Figure 3 The first embodiment of the present invention discloses a linear motor, including a housing 1, a stator assembly 2, a mover assembly 3 and a shock-absorbing assembly 4. The stator assembly 2 and the shock-absorbing assembly 4 are arranged in the housing 1, and the stator assembly 2 drives the mover assembly 3 to reciprocate in a linear direction.

[0036] The shock absorbing assembly 4 includes a first spring piece 41 and a counterweight 42. One end of the first spring piece 41 is positioned at the housing 1, and the other end of the first spring piece 41 is connected to the counterweight 42. In this embodiment, the two ends of the first spring piece 41 are the two ends of the maximum elastic distance of the first spring piece 41, so that the counterweight 42 can move elastically relative to the housing 1.

[0037] The moving direction of the movable subassembly 3 and the direction in which the counterweight 42 moves to drive the first elastic piece 41 to deform are located on the same straight line.

[0038] It can be understood that when the movable component 3 performs linear motion, the vibration effect generated on the casing 1 will drive the counterweight block 42 to swing elastically on the same straight line. The swing of the counterweight block 42 reduces or eliminates the vibration of the casing 1 in the straight line direction, thereby achieving the effect of reducing the vibration of the linear motor when it is working.

[0039] Please continue to combine Figure 2 and Figure 3 The movable subassembly 3 includes a second elastic piece 31, a moving member 32 and a moving shaft 33. The moving shaft 33 is provided at one end of the moving member 32 in the moving direction. The moving shaft 33 extends out of the housing 1 to output linear reciprocating motion outward.

[0040] One end of the second elastic piece 31 is positioned in the housing 1, and the other end of the second elastic piece 31 is connected to the movable shaft 33. The second elastic piece 31 is connected to at least one end of the movable shaft 33. The movable shaft 33 is disposed at the top of the stator assembly 2. A magnet 100 is positioned on one side of the movable shaft 33 near the stator assembly 2. The magnet 100 is a permanent magnet, such as a magnet.

[0041] It will be appreciated that in this embodiment, the number of the second elastic pieces 31 is two, and the two second elastic pieces 31 are disposed at both ends of the movable shaft 33 in the linear movement direction. Thus, the two second elastic pieces 31 support the movable shaft 33 at the top of the stator assembly 2 and provide elastic restoring force for the movable shaft 33 to perform linear motion. In other embodiments, to increase support for the movable shaft 33 or increase the elastic restoring force, the number of the second elastic pieces 31 may be multiple, such as three or four, as long as there are at least two second elastic pieces 31 disposed at both ends of the movable shaft 33 in the linear movement direction. This is not a limitation herein.

[0042] Please continue to combine Figure 2 and Figure 3 The movable shaft 33 passes through the counterweight 42 and the first elastic piece 41 and extends outward. The movable shaft 33 and the counterweight 42 are coaxially arranged, so that during the operation of the motor, the movable shaft 33 can accurately reduce or eliminate the vibration of the casing 1 caused by the reciprocating motion of the movable shaft 33 based on the coaxially swinging counterweight 42.

[0043] The stator assembly 2 includes an iron core 21 and a coil 22. One side of the iron core 21 is connected to the bottom of the housing 1, and the opposite side of the iron core 21 is spaced apart from the magnet 100. The coil 22 is wound around the iron core 21.

[0044] It can be understood that in this embodiment, the stator assembly 2 and the mover assembly 3 operate in a magnetic levitation driving manner. Since the driving principle of the magnetic levitation linear motor is a common technology, it will not be described in detail here.

[0045] Please continue to combine Figure 2 and Figure 3 The number of the shock absorbing components 4 is at least two, and at least two of the shock absorbing components 4 are respectively arranged at both ends of the housing 1 corresponding to the moving direction of the movable sub-assembly 3, and the stator assembly 2 is arranged between the at least two shock absorbing components 4, so that a stator assembly 2, a movable sub-assembly 3 and a shock absorbing component 4 for shock absorption are simultaneously provided in one housing 1.

[0046] As will be appreciated, in this embodiment, the damping assemblies 4 are located at both ends of the housing 1. The counterweights 42 create a uniform gravitational force at both ends of the linear motor, improving the stability and uniformity of the motor's overall installation. Furthermore, the damping assemblies 4 at both ends effectively control the vibration of the housing 1. The damping force generated by the elastic oscillation of the two counterweights 42 acts evenly on the housing 1, achieving a more effective damping effect.

[0047] It can be understood that in other embodiments, the shock absorbing assembly 4 can also be set to one, three, four or more. For example, when it is set to one, the shock absorbing assembly 4 is arranged adjacent to the movable sub-assembly 3. When it is set to three, the three can be synchronously arranged at one end of the movable sub-assembly 3, or two of them can be arranged at both ends of the moving direction of the movable sub-assembly 3, and the last one can be arranged at one end. As long as each shock absorbing assembly 4 can be arranged in the linear direction of movement of the movable sub-assembly 3, no limitation is made here.

[0048] Please combine Figure 2 and Figure 4 The first spring piece 41 includes a first end 411, a middle section 412, and a second end 413, which are connected in sequence. The first end 411 is connected to the housing 1, and the second end 413 is connected to the counterweight 42, allowing the counterweight 42 to elastically swing relative to the housing 1. The middle section 412 is an arc segment to increase the length of the spring piece between the first end 411 and the second end 413. The arc-shaped middle section 412 also reduces the area of ​​the first spring piece 41, reducing the internal width requirement of the housing 1 and making the overall size of the linear motor smaller.

[0049] The end of the first end 411 is plugged into the side wall of the housing 1 , the bottom of the first end 411 is plugged into the bottom of the housing 1 , and the two counterweights 42 are respectively disposed on two opposite sides of the second end 413 .

[0050] It is understood that there are two counterweights 42, and the two counterweights 42 are symmetrically arranged relative to the second end 413, so that the first spring piece 41 is provided with counterweights 42 of equal mass in both directions of elastic deformation, thereby improving the force balance of the first spring piece 41. In other embodiments, the counterweight 42 can also be provided on a single side of the second end 413, that is, the counterweight 42 is provided as one piece, and can be positioned on any side of the second end 413.

[0051] In this embodiment, the top of the housing 1 is an open structure, and the open structure of the housing 1 can be specifically set to a concave or L-shaped structure, such as Figure 2 The structure shown in FIG is a concave structure, that is, the housing 1 is provided with a bottom plate and side plates on both sides; in other embodiments, when the housing 1 is an L-shaped structure, the housing 1 is provided with a bottom plate and a single side plate.

[0052] It can be understood that the open structure at the top of the casing 1 can make the assembly of the linear motor more convenient, improve the heat dissipation efficiency of the entire motor, and reduce the weight of the motor. The lighter casing 1 can make the shock absorbing module 4 have a better shock absorbing effect and improve the shock absorbing efficiency.

[0053] Please continue reading Figure 3 The stator assembly 2, the moving part 32 and the shock absorbing assembly 4 are symmetrically arranged on the housing 1 with the center of the stator assembly 2 as the axis of symmetry, so that the mass distribution between the various components inside the linear motor is more uniform, and the various forces generated during the working process are more uniform, further reducing the force stability of the linear motor during high-frequency linear reciprocating motion, and avoiding the generation of additional abnormal noise.

[0054] See also Figure 5 The second embodiment of the present invention further provides an electric toothbrush 200, which has the linear motor described in the first embodiment built in. The handle of the electric toothbrush is directly connected to the moving shaft 33 of the motor, and the brush head of the toothbrush performs linear reciprocating motion along the axial direction.

[0055] Compared with the prior art, the linear motor and electric toothbrush provided by the present invention have the following beneficial effects:

[0056] 1. By setting a shock-absorbing component inside the linear motor and positioning the counterweight block through the first spring piece, the vibration generated by the linear motor in the moving direction is reduced or eliminated, so that the vibration generated by the electric product is reduced or eliminated inside the linear motor, which can effectively reduce the vibration during the use of the electric product and improve the user experience.

[0057] 2. By arranging the movable shaft and the counterweight block coaxially, the movable shaft can accurately reduce or eliminate the vibration of the casing caused by the reciprocating motion of the movable shaft based on the coaxial swinging counterweight block during the operation of the motor.

[0058] 3. By placing the damping components at both ends of the housing, the counterweights create a uniform force on both ends of the linear motor, improving overall motor installation stability and force uniformity. Furthermore, the damping components at both ends effectively control housing vibration. The damping force generated by the elastic oscillation of the two counterweights acts evenly on the housing, providing enhanced vibration reduction.

[0059] 4. By arranging the two counterweights symmetrically relative to the second end, the first elastic piece is provided with counterweights of the same mass in both directions of elastic deformation, thereby improving the force balance of the first elastic piece.

[0060] 5. The open structure on the top of the casing can make the assembly of the linear motor more convenient, improve the heat dissipation efficiency of the entire motor, and reduce the weight of the motor. The lighter casing can make the shock absorption effect of the shock absorption module better and improve the shock absorption efficiency.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A linear motor, characterized in that: Including housing, stator assembly, mover assembly and shock absorption assembly; The stator assembly and the shock absorbing assembly are arranged in the housing, and the stator assembly drives the mover assembly to move; The shock absorbing assembly includes a first elastic piece and a counterweight, wherein one end of the first elastic piece is positioned on the housing, and the other end of the first elastic piece is connected to the counterweight; The moving direction of the movable subassembly and the direction in which the counterweight moves to drive the first elastic piece to deform are located on the same straight line.

2. The linear motor according to claim 1, characterized in that: The movable subassembly includes a second elastic piece, a moving member and a moving shaft, wherein the moving shaft is provided at one end of the moving member in the moving direction; One end of the second elastic piece is positioned on the housing, and the other end of the second elastic piece is connected to the movable shaft; The second elastic piece is connected to at least one end of the movable shaft; The moving part is arranged on the top of the stator assembly, and a magnet is positioned on one side of the moving shaft close to the stator assembly.

3. The linear motor according to claim 2, characterized in that: The movable shaft passes through the counterweight and the first elastic piece and extends outward; The movable shaft is coaxially arranged with the counterweight.

4. The linear motor according to claim 2, characterized in that: The number of the second elastic pieces is at least two, and the at least two second elastic pieces are respectively arranged at two ends of the moving axis in the moving direction.

5. The linear motor according to claim 1, characterized in that: There are at least two shock absorbing assemblies, and at least two of the shock absorbing assemblies are respectively arranged at two ends of the housing corresponding to the moving direction of the movable subassembly; The stator assembly is arranged between at least two of the shock absorbing assemblies.

6. The linear motor according to claim 1, characterized in that: There are two counterweight blocks, and the two counterweight blocks are symmetrically arranged relative to the first elastic sheet.

7. The linear motor according to claim 1, characterized in that: The first elastic piece includes a first end, a middle section, and a second end connected in sequence, the first end is connected to the housing, and the second end is connected to the counterweight; The middle segment is an arc segment.

8. The linear motor according to claim 7, characterized in that: The end of the first end is plugged into the side wall of the housing, and the bottom of the first end is plugged into the bottom of the housing; The two counterweight blocks are respectively arranged on two opposite side surfaces of the second end.

9. The linear motor according to any one of claims 1 to 8, characterized in that: The top of the casing is an open structure.

10. An electric toothbrush, characterized in that: Comprising a linear motor as claimed in claim 9.

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