Linear motor and electric toothbrush

Abstract

The linear motor comprises a machine shell, a stator assembly, a rotor assembly and a damping assembly, the stator assembly and the damping assembly are arranged in the machine shell, the stator assembly drives the rotor assembly to move, the damping assembly comprises a first elastic piece and a balancing weight, one end of the first elastic piece is positioned on the machine shell, the other end of the first elastic piece is connected with the balancing weight, and the balancing weight is connected with the stator assembly. The moving direction of the mover 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 invention relates to the field of electric toothbrush motors, and in particular to a linear motor and an electric toothbrush. Background Art

[0002] Electric toothbrushes achieve high-frequency linear reciprocating motion by setting up linear motors. The most common linear motors used in electric toothbrushes are magnetic levitation linear motors, which achieve high-frequency linear reciprocating motion through the interaction between the permanent magnets of the mover and the energized coils of the stator. This also causes the linear motor to generate greater vibrations during operation, affecting the user's experience of holding the toothbrush. Summary of the invention

[0003] The invention 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 at 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 at 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 sheet and extends outward; the movable shaft and the counterweight block are coaxially arranged.

[0007] Preferably, the number of the second elastic sheets is at least two, and at least two second elastic sheets are disposed at two ends of the moving axis in the moving direction.

[0008] Preferably, the number of the shock absorbing assemblies is at least two, and at least two of the shock absorbing assemblies are disposed at two ends of the housing corresponding to the moving direction of the mover assembly; and the stator assembly is disposed 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 which are connected in sequence, the first end is connected to the housing, and the second end is connected to the counterweight block; 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 present invention also provides an electric toothbrush, comprising any 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: 1. By setting a shock-absorbing component inside the linear motor and positioning the counterweight block by the first spring sheet, the vibration generated by the linear motor in the moving direction can be reduced or eliminated, so that the vibration generated by the electric product can be 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.

[0015] 2. By arranging the movable shaft and the counterweight block coaxially, the movable shaft can accurately reduce or eliminate the housing vibration caused by the reciprocating motion of the movable shaft based on the coaxially swinging counterweight block during the operation of the motor.

[0016] 3. By placing the shock-absorbing components at both ends of the casing, the counterweights form uniform gravity at both ends of the linear motor, improving the stability of the overall installation of the motor and the uniformity of force. At the same time, the shock-absorbing components at both ends can effectively control the vibration of the casing, and the damping force formed by the two counterweights during the elastic swing can act evenly on the casing, which has a better shock-absorbing effect.

[0017] 4. By symmetrically arranging the two counterweights relative to the second end, the first spring sheet is provided with counterweights of the same mass in both directions of elastic deformation, thereby improving the force balance of the first spring sheet.

[0018] 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

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] FIG. 1 is a schematic structural diagram of a linear motor provided in a first embodiment of the present invention.

[0021] FIG. 2 is a schematic diagram of an exploded structure of a linear motor provided in the first embodiment of the present invention.

[0022] FIG. 3 is a schematic diagram of an exploded structure of the linear motor provided by the first embodiment of the present invention from another angle.

[0023] FIG. 4 is a schematic structural diagram of a shock absorbing assembly in a linear motor provided in the first embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of the internal structure of an electric toothbrush provided in the second embodiment of the present invention. Description of the label: 1. Casing; 2. stator assembly; 21. iron core; 22. coil; 3. Moving subassembly; 31. Second spring piece; 32. Moving part; 33. Moving shaft; 4. shock absorbing assembly; 41. first spring piece; 411. first end; 412. middle section; 413. second end; 42. counterweight; 100. Magnet; 200. Electric toothbrush. DETAILED DESCRIPTION

[0025] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0026] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0027] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0028] 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.

[0029] 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 the present 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.

[0030] The moving direction of the movable subassembly 3 and the direction in which the counterweight block 42 moves to drive the first elastic sheet 41 to deform are located on the same straight line.

[0031] It can be understood that when the movable subassembly 3 makes a linear motion, the vibration effect 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.

[0032] 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 arranged at one end of the moving member 32 in the moving direction. The moving shaft 33 extends out of the housing 1 to output a linear reciprocating motion outward.

[0033] One end of the second elastic piece 31 is positioned at the housing 1, and the other end of the second elastic piece 31 is connected to the moving shaft 33, and the second elastic piece 31 is connected to at least one end of the moving shaft 33. The moving shaft 33 is disposed at the top of the stator assembly 2, and a magnet 100 is positioned on one side of the moving shaft 33 close to the stator assembly 2, and the magnet 100 is a permanent magnet, such as a magnet.

[0034] It can be understood that in this embodiment, the number of the second elastic pieces 31 is two, and the two second elastic pieces 31 are respectively arranged at the two ends of the moving shaft 33 in the linear moving direction, so the two second elastic pieces 31 support the moving shaft 33 at the top of the stator assembly 2, and the two second elastic pieces 31 provide elastic restoring force for the moving shaft 33 to perform linear motion. In other embodiments, in order to increase the support or elastic restoring force for the moving shaft 33, the number of the second elastic pieces 31 can also be set to multiple, such as three, four, etc., as long as there can be at least two second elastic pieces 31 respectively arranged at the two ends of the moving shaft 33 in the linear moving direction, which is not limited here.

[0035] Please continue to combine Figure 2 and Figure 3 The movable shaft 33 passes through the counterweight block 42 and the first elastic sheet 41 and extends outward. The movable shaft 33 and the counterweight block 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 block 42.

[0036] 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.

[0037] It can be understood that in the present embodiment, the stator assembly 2 and the mover assembly 3 work in a magnetic suspension driving mode. Since the driving principle of the magnetic suspension linear motor is a common technology, it will not be described in detail here.

[0038] 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 disposed at both ends of the housing 1 corresponding to the moving direction of the movable sub-assembly 3, and the stator assembly 2 is disposed between at least two of the 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 disposed in one housing 1.

[0039] It can be understood that in this embodiment, the shock absorbing components 4 are arranged at both ends of the housing 1, and the two ends of the linear motor form a uniform gravity by the counterweight blocks 42, which improves the stability of the overall installation of the motor and the uniformity of force. At the same time, the shock absorbing components 4 at both ends can effectively control the vibration of the housing 1, and the damping force formed by the two counterweight blocks 42 during the elastic swing process can act evenly on the housing 1, which has a better shock absorption effect.

[0040] 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 assembly 3. When it is set to three, the three can be synchronously arranged at one end of the movable assembly 3, or two of them can be arranged at both ends of the moving direction of the movable 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 the movement of the movable assembly 3, no limitation is made here.

[0041] 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, so that the counterweight 42 can swing elastically 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. At the same time, the arc-shaped middle section 412 also makes the area of ​​the first spring piece 41 smaller, which can reduce the internal width requirement of the housing 1 and make the overall size of the linear motor smaller.

[0042] 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 disposed on two opposite sides of the second end 413 .

[0043] It can be understood that the number of the counterweight blocks 42 is two, and the two counterweight blocks 42 are symmetrically arranged relative to the second end 413, so that the first spring piece 41 is provided with counterweight blocks 42 of the same mass in both directions of elastic deformation, thereby improving the force balance of the first spring piece 41. In other embodiments, the counterweight block 42 can also be set on a single side of the second end 413, that is, the counterweight block 42 is set as one piece, and any side of the second end 413 can be arbitrarily selected for positioning.

[0044] 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 the figure is a concave structure, that is, the housing 1 is provided with a bottom plate and side plates on two 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.

[0045] It can be understood that the open structure on the top of the casing 1 can make the assembly of the linear motor more convenient and improve the heat dissipation efficiency of the entire motor, while reducing the weight of the motor. A lighter casing 1 can make the shock absorbing effect of the shock absorbing module 4 better and improve the shock absorbing efficiency.

[0046] Please continue reading Figure 3The 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 symmetry axis, so that the mass distribution between the internal components of 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.

[0047] 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.

[0048] Compared with the prior art, the linear motor and electric toothbrush provided by the present invention have the following beneficial effects: 1. By setting a shock-absorbing component inside the linear motor and positioning the counterweight block by the first spring sheet, the vibration generated by the linear motor in the moving direction can be reduced or eliminated, so that the vibration generated by the electric product can be 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.

[0049] 2. By arranging the movable shaft and the counterweight block coaxially, the movable shaft can accurately reduce or eliminate the housing vibration caused by the reciprocating motion of the movable shaft based on the coaxially swinging counterweight block during the operation of the motor.

[0050] 3. By placing the shock-absorbing components at both ends of the casing, the counterweights form uniform gravity at both ends of the linear motor, improving the stability of the overall installation of the motor and the uniformity of force. At the same time, the shock-absorbing components at both ends can effectively control the vibration of the casing, and the damping force formed by the two counterweights during the elastic swing can act evenly on the casing, which has a better shock-absorbing effect.

[0051] 4. By symmetrically arranging the two counterweights relative to the second end, the first spring sheet is provided with counterweights of the same mass in both directions of elastic deformation, thereby improving the force balance of the first spring sheet.

[0052] 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.

[0053] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

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

2. The linear motor according to claim 1, characterized in that: The movable subassembly comprises a second elastic piece, a moving member and a moving shaft, wherein the moving shaft is arranged at one end of the moving member in the moving direction; One end of the second elastic sheet is positioned at the housing, and the other end of the second elastic sheet is connected to the moving shaft; The second elastic piece is connected to at least one end of the moving 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 block and the first elastic sheet and extends outward; The moving shaft is coaxially arranged with the counterweight block.

4. The linear motor according to claim 2, characterized in that: The number of the second elastic sheets is at least two, and at least two of the second elastic sheets 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: The number of the shock absorbing components is at least two, and at least two of the shock absorbing components are respectively arranged at two ends of the housing corresponding to the moving direction of the movable sub-assembly; The stator assembly is arranged between at least two of the damping assemblies.

6. The linear motor according to claim 1, characterized in that: The number of the counterweight blocks is two, 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 which are connected in sequence, the first end is connected to the housing, and the second end is connected to the counterweight block; 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.

Images