Motor assembly applied to electric toothbrush and electric toothbrush

Abstract

The motor assembly applied to the electric toothbrush comprises a motor shell, a driving piece and a first limiting piece, the motor shell is provided with a via hole, the driving piece is partially arranged in the motor shell, an output shaft of the driving piece partially penetrates through the via hole, and the first limiting piece is arranged in the motor shell. An output shaft of the driving part can move in a reciprocating mode in the axial direction, a limiting structure is arranged on the portion, located in the motor shell, of the output shaft, the first limiting part is arranged on the motor shell, when the motor is not powered on, the limiting structure and the first limiting part are spaced, and the first limiting part is used for limiting the length, stretching out of the via hole, of the output shaft. The limiting structure is matched with the first limiting piece to limit the axial movement distance of the output shaft, and therefore the problem that in the falling process of an electric toothbrush in the prior art, a motor shaft breaks away from an original normal station or abuts against other parts of the motor, and the motor is damaged is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to toothbrushes, and in particular relates to a motor component used for an electric toothbrush and an electric toothbrush. Background Art

[0002] As people's living standards improve, oral cleaning appliances such as motor components used in electric toothbrushes are widely welcomed as electronic products for personal care. The motor components usually used in electric toothbrushes may include a vibration motor and a brush head, the brush head is connected to the output shaft of the vibration motor, and the vibration motor drives the brush head to vibrate, thereby cleaning the user's oral cavity.

[0003] In order to improve the cleaning efficiency of electric toothbrushes, electric toothbrushes have the function of axially moving the brush head. However, in actual use, in electric toothbrushes with axial movement dimensions, since the motor shaft can move axially, when the motor falls, the motor shaft may move due to the fall, causing the motor shaft to be out of its normal position or to press against other parts of the motor, thus damaging the motor.

[0004] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is that when the electric toothbrush in the prior art falls, the motor shaft is separated from the original normal position or abuts against other parts of the motor, thus damaging the motor.

[0006] In order to solve the above-mentioned technical problems, the utility model provides, on the one hand, a motor assembly for an electric toothbrush. The motor assembly for an electric toothbrush includes a motor housing, a driving member and a first limit member. The motor housing has a through hole. The driving member is partially arranged inside the motor housing. The output shaft of the driving member passes through the through hole. The output shaft of the driving member can reciprocate along the axial direction. A limiting structure is arranged on the part of the output shaft located inside the motor housing. The first limit member is arranged on the motor housing. When the motor is not powered on, the limiting structure and the first limit member are spaced apart from each other. The first limit member is used to limit the length of the output shaft extending out of the through hole.

[0007] In this way, the first limit member has the function of axially limiting the moving distance of the output shaft. During the normal operation of the electric toothbrush and when the motor is not powered on, the first limit member and the limiting structure maintain a mutual distance, thereby avoiding the phenomenon that the first limit member interferes with the normal movement of the output shaft. When the output shaft has abnormal axial movement, the first limit member can limit the axial movement of the limiting structure by abutting against the limiting structure, thereby limiting the axial movement of the output shaft, that is, limiting the length of the output shaft extending out of the through hole.

[0008] In the present application, a limiting structure is used in conjunction with a first limiting member to form an axial limit on the output shaft. When the output shaft moves axially due to an external force, the limiting structure on the output shaft will abut against the first limiting member, thereby limiting the distance of the axial movement of the output shaft, thereby limiting the length of the output shaft extending out of the through hole, thereby avoiding the phenomenon in the prior art that the output shaft of the motor moves axially too far after being subjected to an external force, resulting in misalignment and damage to other components; this is beneficial to improving the stability of the electric toothbrush, especially when the electric toothbrush accidentally falls and the external force impacts the output shaft, the first limiting member can protect the output shaft, thereby preventing damage to the output shaft, and further helping to improve the service life of the electric toothbrush.

[0009] In one embodiment, the first limit member has a first portion and a second portion extending in the axial direction, the first portion is arranged inside the through hole, the second portion is arranged inside the motor housing, and one side of the second portion is attached to the motor housing.

[0010] In this way, the first limiting member is arranged with a two-part structure, and the first part is arranged inside the through hole to achieve precise positioning and installation, which is beneficial to improving the installation accuracy and installation efficiency of the first limiting member. At the same time, the first part also has the function of radially limiting the output shaft, thereby improving the movement accuracy of the output shaft and facilitating the protection of the output shaft; the second part is arranged inside the motor housing and fits with the motor housing. When the output shaft is forced to move axially, the second part is used to abut the limiting structure, and the second part and the first part jointly limit the output shaft. Since the second part is fit with the motor housing, this also uses the motor housing to limit the output shaft, which is beneficial to improve the stability of the overall structure and improve the limiting reliability; at the same time, the positions of the first part and the second part are relatively reduced in space, which is beneficial to the miniaturized design of the electric toothbrush, convenient for users to carry, and further enhances the product competitiveness.

[0011] In one embodiment, the limiting structure is a clamping member, a clamping groove is provided on the output shaft, the clamping member is fixedly disposed in the clamping groove, and the clamping member can abut against the first limiting member.

[0012] With such a configuration, the limiting structure adopts a clip-on component, and the clip-on component is clipped into the clip-on groove to achieve installation and fixation of the clip-on component. The setting of the clip-on component achieves a detachable effect, thereby facilitating the disassembly and assembly of the clip-on component when needed, so as to improve the flexibility of the structure. At the same time, part of the clip-on component is clipped into the inside of the clip-on groove, and the other part can abut against the first limiting component, which is beneficial to improve the limiting strength.

[0013] In one embodiment, the distance between the first limiting member and the clamping member is greater than the extension length of the output shaft when it moves back and forth.

[0014] Such a configuration ensures that during the normal operation of the electric toothbrush, the limiting structure and the first limiting member will not abut against each other, thereby avoiding the phenomenon that the first limiting member interferes with the normal movement of the output shaft, which is conducive to ensuring the stable operation of the electric toothbrush.

[0015] In one embodiment, the portion of the output shaft located in the motor housing has a larger diameter than the output shaft extending out of the motor housing to form an abutment section, and the limiting structure is the abutment section, which abuts against the first limiting member.

[0016] In this way, the shaft section with an increased diameter of the output shaft located inside the motor housing forms an abutment section, and the diameter of the abutment section is not less than the diameter of the first limiter, so that when the abutment section moves to the position of the first limiter, the abutment section cannot continue to move, that is, the axial movement distance of the output shaft is limited, and the length of the output shaft extending out of the through hole is limited. The present application utilizes the change in the diameter of the output shaft itself to achieve limited abutment with the first limiter, without the need for other components, and the overall structure is simple, easy to process and install, and is conducive to the miniaturization design of the electric toothbrush.

[0017] In one embodiment, the abutting section and other portions of the adjacent output shaft are in a stepped transition.

[0018] In this way, a stepped transition is adopted between the abutment section and other shaft sections of the output shaft, that is, a stepped structure is formed in the transition area. When the output shaft moves axially under force, the stepped structure abuts against the first limit member through the step surface, thereby limiting the axial movement distance of the output shaft. The abutment structure setting between the step surface and the first limit member is beneficial to improving the stability of the limit in the process of limiting the output shaft.

[0019] In one embodiment, the diameter of a portion of the output shaft is uniformly increased to form an abutment section, and the abutment section smoothly transitions to other adjacent portions of the output shaft.

[0020] With such a configuration, the output shaft adopts a structure with uniformly increased diameter to form an abutment section, thereby providing an abutment section with a large diameter. When the output shaft is subjected to force and moves axially, the abutment section and the first limit member are abutted and limited. The smooth transition structural setting is adopted to facilitate the overall forming of the output shaft. At the same time, the smooth transition structural setting is conducive to gradual abutment with the first limit member, and gradual limitation between the abutment section and the first limit member to avoid collision between the abutment section and the first limit member, resulting in damage to the abutment section and the first limit member, which is conducive to improving the stable operation of the overall structure.

[0021] In one embodiment, the hardness of the motor housing is smaller than the hardness of the first limit member; and / or the hardness of the first limit member is smaller than the hardness of the output shaft.

[0022] With such arrangement, the hardness of the motor housing is smaller than the hardness of the first limit piece, so that when the first limit piece is subjected to a large external force applied by the limit structure of the output shaft, the first limit piece will not be deformed or damaged, which is beneficial to ensuring the stability of the first limit piece structure; adopting the first limit piece with a hardness smaller than that of the output shaft is beneficial to protecting the output shaft, avoiding the possibility of damage to the output shaft during movement, and ensuring the integrity of the output shaft structure. At the same time, adopting the output shaft with a hardness greater than that of the first limit piece is also beneficial to reducing noise.

[0023] In one embodiment, the motor assembly used for the electric toothbrush also includes a motor bracket, a driving member is arranged on the motor bracket, an avoidance hole is provided at one end of the motor housing away from the through hole, the avoidance hole allows the output shaft to reciprocate in the axial direction, and the motor bracket includes a second limit member, the second limit member is arranged adjacent to the avoidance hole, and the second limit member is used to limit the length of the avoidance hole through which the output shaft extends.

[0024] In this way, an avoidance hole is set on the motor housing to avoid the output shaft when the output shaft moves axially, avoiding interference and collision between the output shaft and the motor housing, resulting in the output shaft being unable to move normally and stably. The present application limits the output shaft by having a second limiter on the motor bracket. The second limiter is arranged adjacent to the avoidance hole, and the length of the avoidance hole through which the output shaft extends is limited by the second limiter, that is, the axial movement distance of the output shaft is limited. During the normal operation of the electric toothbrush and when the motor is not powered on, the second limiter and the output shaft are kept spaced apart from each other to avoid the second limiter interfering with the normal movement of the output shaft; when the output shaft moves abnormally axially, the second limiter can abut the output shaft to limit the length of the output shaft extending out of the avoidance hole, thereby limiting the axial movement of the output shaft. Moreover, the first limit member and the second limit member can limit the output shaft in two directions of repeated axial movement of the output shaft, so that no matter how the output shaft is subjected to force, the output shaft can be better limited, which is beneficial to the protection of the output shaft and further helps to increase the service life of the electric toothbrush.

[0025] In one embodiment, the second limiting member is a baffle structure.

[0026] With such a configuration, the second limit member adopts a baffle structure to form a larger limit abutment surface. When the output shaft abuts against the second limit member, the limit abutment surface provides a larger area for abutting the output shaft, which is beneficial to improving the stability of the limit. At the same time, the overall installation strength of the baffle structure is large, which is beneficial to improving the limit strength and ensuring the stability of the overall structure.

[0027] In one embodiment, the motor housing also includes a third limit member, which is arranged at an end away from the through hole. The third limit member is provided with an avoidance hole. An axial magnetic ring for driving the output shaft to move axially is fixedly provided on the output shaft. The third limit member can resist the axial magnetic ring to limit the length of the output shaft extending out of the avoidance hole.

[0028] With such a configuration, an avoidance hole is opened on the third limit member, and the third limit member and the avoidance hole are formed into a structural member. There is no need to add a new limit structure to limit the output shaft. The overall structure is simple, which is beneficial to reducing the size of the motor assembly. When the output shaft is forced to move axially, the structural setting of the third limit member can support the shaft magnetic ring, and limit the movement of the shaft magnetic ring to limit the axial movement distance of the output shaft. The structural setting of the third limit member further ensures that the output shaft avoids axial movement and misalignment.

[0029] In one embodiment, the distance between the output shaft and the second limit member is smaller than the distance between the shaft magnetic ring and the third limit member; and / or the distance between the output shaft and the second limit member is greater than the axial movement distance of the output shaft during operation.

[0030] With such arrangement, during the normal operation of the electric toothbrush and when the motor is not powered on, the second limit member and the output shaft maintain a mutual spacing, thereby avoiding the phenomenon that the second limit member interferes with the normal movement of the output shaft; when the output shaft has abnormal axial movement, the second limit member takes effect first, that is, the output shaft first abuts the second limit member, and the second limit member can abut the output shaft to limit the length of the output shaft extending out of the avoidance hole, thereby limiting the axial movement of the output shaft; when the output shaft is subjected to greater force and the output shaft further moves axially, while achieving multiple protections for the output shaft, the third limit member further axially limits the output shaft through the limiting shaft magnetic ring. The structural setting in which the output shaft of the present application abuts the second limit member first is beneficial to protecting the shaft magnetic ring, preventing the shaft magnetic ring from falling off under force, and is beneficial to improving the stability of the overall structure.

[0031] Another aspect of the utility model provides an electric toothbrush, which includes the above-mentioned motor assembly applied to the electric toothbrush.

[0032] With such an arrangement, the electric toothbrush of the present application, through the arrangement of the above-mentioned motor assembly, realizes that when the output shaft is forced to move axially, the axial movement distance of the output shaft is limited, thereby avoiding the axial misalignment of the output shaft, thereby avoiding the dislocation and damage to the motor and other components caused by the axial misalignment of the output shaft in the prior art, which is beneficial to ensuring the stability of the electric toothbrush operation and improving the user experience of the electric toothbrush. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A top view of the handle of the electric toothbrush of the present invention;

[0035] Figure 2 for Figure 1 AA cross-sectional view;

[0036] Figure 3 for Figure 2 The enlarged view of point B;

[0037] Figure 4 for Figure 2 The enlarged view of point C;

[0038] Figure 5 It is a schematic diagram of the installation structure of the output shaft and the first limiting member of the utility model;

[0039] Figure 6 for Figure 5 The enlarged view of D;

[0040] Figure 7 It is a three-dimensional structural schematic diagram of the output shaft of the utility model;

[0041] Figure 8 It is a three-dimensional structural schematic diagram of the first limiting member of the utility model;

[0042] Fig. 9 It is a schematic diagram of the three-dimensional structure of the third limiting member of the utility model.

[0043] Description of reference numerals:

[0044] 10. Handle; 20. Output shaft; 210. Snap-in groove; 30. Motor housing; 310. Through hole; 320. Third limiter; 321. Avoidance hole; 40. First limiter; 410. First part; 420. Second part; 50. Motor bracket; 510. Second limiter; 60. Snap-in; 70. Shaft magnetic ring. DETAILED DESCRIPTION

[0045] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0047] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0048] The utility model provides an electric toothbrush, which comprises a handle 10 and a brush head. The brush head is located at one end of the handle 10 and can be used to clean the oral cavity. The handle 10 can be held by a user to enable the user to clean the oral cavity more conveniently.

[0049] Among them, the handle 10 is used to fix the motor assembly, and the motor assembly is the motor assembly used for the electric toothbrush in this application. The motor assembly is used to solve the problem in the prior art that when the electric toothbrush falls, the motor shaft deviates from the original normal position or presses against other parts of the motor to damage the motor.

[0050] like Figures 1 to 3 As shown, the motor assembly used in the electric toothbrush includes a motor housing 30 and a driving member, the motor housing 30 has a through hole 310, the driving member is partially arranged inside the motor housing 30, the output shaft 20 of the driving member partially passes through the through hole 310, and the output shaft 20 of the driving member can reciprocate in the axial direction.

[0051] The driving member is a motor. Driven by the motor, the output shaft 20 can drive the brush head to move axially back and forth to clean the oral cavity, so as to improve the cleaning efficiency of the electric toothbrush.

[0052] In order to avoid the problem in the prior art that the output shaft 20 of the motor is axially displaced by external force, causing the motor to deviate from its original normal working position or to press against other parts of the motor and damage the motor, the motor assembly used in the electric toothbrush in this embodiment includes a first limit member 40, which is used to limit the length of the output shaft 20 extending out of the through hole 310.

[0053] like Figures 1 to 3 as well as Figures 5 to 8 As shown, a limiting structure is provided at the portion of the output shaft 20 located inside the motor housing 30, and a first limiting member 40 is provided at the motor housing 30. When the motor is not powered on, the limiting structure and the first limiting member 40 are spaced apart from each other, and the first limiting member 40 is used to limit the length of the output shaft 20 extending out of the through hole 310.

[0054] Specifically, the first limit member 40 has the function of axially limiting the moving distance of the output shaft 20. During the normal operation of the electric toothbrush and when the motor is not powered on, the first limit member 40 and the limiting structure maintain a mutual distance, thereby avoiding the first limit member 40 interfering with the normal movement of the output shaft 20. When the output shaft 20 has abnormal axial movement, the first limit member 40 can limit the axial movement of the limiting structure by abutting against the limiting structure, thereby limiting the axial movement of the output shaft 20, that is, limiting the length of the output shaft 20 extending out of the through hole 310.

[0055] In this embodiment, a limiting structure is used in conjunction with the first limiting member 40 to form an axial limit for the output shaft 20. When the output shaft 20 moves axially due to an external force, the limiting structure on the output shaft 20 will abut against the first limiting member 40, thereby limiting the distance of the axial movement of the output shaft 20, thereby limiting the length of the output shaft 20 extending out of the through hole 310, thereby avoiding the phenomenon in the prior art that the output shaft 20 of the motor moves axially too far after being subjected to an external force, resulting in dislocation and damage to other components. This is beneficial to improving the stability of the electric toothbrush, especially when the electric toothbrush accidentally falls and the external force impacts the output shaft 20, the first limiting member 40 can protect the output shaft 20, thereby preventing damage to the output shaft 20, which is further beneficial to improving the service life of the electric toothbrush.

[0056] It should be noted that the hardness of the motor housing 30 in this embodiment is less than the hardness of the first limit member 40, so that when the first limit member 40 is subjected to a large external force applied by the limiting structure of the output shaft 20, the first limit member 40 will not be deformed or damaged, which is beneficial to ensuring the stability of the structure of the first limit member 40.

[0057] In this embodiment, the hardness of the first stopper 40 is less than that of the output shaft 20. The hardness of the first stopper 40 is less than that of the output shaft 20, which is beneficial to protecting the output shaft 20, avoiding the possibility of damage to the output shaft 20 during movement, and ensuring the integrity of the structure of the output shaft 20. At the same time, the hardness of the output shaft 20 is greater than that of the first stopper 40, which is also beneficial to reducing noise. In this embodiment, the first stopper 40, the output shaft 20 and the motor housing 30 are used in combination with materials of different hardness, which effectively avoids the generation of noise while ensuring the axial movement distance of the output shaft 20, thereby improving the user experience.

[0058] like Figure 2 and Figure 8 As shown, the first limit member 40 in this embodiment is arranged on the motor housing 30. Specifically, the first limit member 40 has a first part 410 and a second part 420 extending along the axial direction. The first part 410 is arranged inside the through hole 310, and the second part 420 is arranged inside the motor housing 30. One side of the second part 420 is attached to the motor housing 30.

[0059] Specifically, the first position-limiting member 40 is provided with a two-part structure, and the first part 410 is provided inside the through hole 310 to achieve accurate positioning and installation, which is conducive to improving the installation accuracy and installation efficiency of the first position-limiting member 40. At the same time, the first part 410 also has the function of radially limiting the output shaft 20, thereby improving the movement accuracy of the output shaft 20; it is conducive to the protection of the output shaft 20, and the second part 420 is provided inside the motor housing 30 and fits with the motor housing 30. When the output shaft 20 is forced to move axially, the second part 420 is used to abut the limiting structure, and the second part 420 and the first part 410 jointly limit the output shaft 20. Since the second part 420 fits with the motor housing 30, the motor housing 30 is used to limit the output shaft 20, which is conducive to improving the stability of the overall structure and improving the limiting efficiency. At the same time, the positions of the first part 410 and the second part 420 are relatively reduced in space, which is conducive to the miniaturization design of the electric toothbrush, convenient for users to carry, and further enhances the competitiveness of the product.

[0060] Among them, the first part 410 can be set in a ring structure, that is, it can be a full ring structure, which has better buffering and limiting functions; the first part 410 can also adopt one or more arc plate structures extending axially along the through hole 310, and the arc plate is installed and fixed on the second part 420.

[0061] Similarly, the second part 420 can be set in a ring structure, that is, it can be a full ring structure, which has better buffering and limiting effects; the second part 420 can also adopt one or more arc plate structures extending axially along the through hole 310, and the arc plate is installed and fixed on the first part 410.

[0062] In this embodiment, the first part 410 and the second part 420 are an integrally formed structure. The integrally formed structure is convenient for directly processing and producing the first limit member 40, which is conducive to improving production efficiency.

[0063] In this embodiment, the following implementation modes are provided according to different limiting structures.

[0064] like Figure 2 and Figure 5 and Figure 6In the specific embodiment shown, the limiting structure is a clamping member 60 . A clamping groove 210 is formed on the output shaft 20 . The clamping member 60 is fixedly disposed in the clamping groove 210 , and the clamping member 60 can resist the first limiting member 40 .

[0065] Specifically, a snap-in groove 210 is provided on the output shaft 20 to provide an installation position for the installation and fixation of the snap-in component 60. The installation and fixation of the snap-in component 60 is achieved by snapping the snap-in component 60 in the snap-in groove 210. The setting of the snap-in component 60 achieves a detachable effect, thereby facilitating the disassembly and assembly of the snap-in component 60 when needed, so as to improve the flexibility of the structure. At the same time, part of the snap-in component 60 is snapped into the inside of the snap-in groove 210, and the other part can abut against the first limit component 40, which is beneficial to improve the limit strength.

[0066] In this embodiment, the distance between the first limiter 40 and the clamping member 60 is greater than the extension length of the output shaft 20 when it reciprocates. During the normal operation of the electric toothbrush, the clamping member 60 and the first limiter 40 will not be in contact with each other, and the two are arranged at a distance, thereby avoiding the phenomenon that the first limiter 40 interferes with the normal movement of the output shaft 20, which is conducive to ensuring the stable operation of the electric toothbrush.

[0067] The clamping member 60 may be an annular clamping member 60 , or an arc-shaped clamping member 60 .

[0068] In this embodiment, the clamping member 60 is made of copper to have greater hardness, thereby preventing deformation and damage from occurring during the abutment with the first limiting member 40 .

[0069] In this embodiment, when the output shaft 20 is subjected to force and moves axially, the clamping member 60 moves along with the output shaft 20, and the first limiting member 40 abuts against the portion of the clamping member 60 exposed outside the clamping groove 210. The first limiting member 40 limits the clamping member 60, and the clamping member 60 limits the movement of the output shaft 20, thereby avoiding axial displacement of the output shaft 20.

[0070] In a specific embodiment not shown in the figure, the portion of the output shaft 20 located in the motor housing 30 has a larger diameter than the output shaft 20 extending out of the motor housing 30 to form an abutment section, and the limiting structure is the abutment section, which abuts the first limiting member 40.

[0071] In this embodiment, the shaft section with an increased diameter of the output shaft 20 located inside the motor housing 30 forms an abutment section, and the diameter of the abutment section is larger than the diameter of the first position-limiting member 40, so that when the abutment section moves to the position of the first position-limiting member 40, the abutment section cannot continue to move, that is, the axial movement distance of the output shaft 20 is limited, and the length of the output shaft 20 extending out of the through hole 310 is limited. The present application utilizes the change in the diameter of the output shaft 20 itself to achieve the limited abutment with the first position-limiting member 40, without the need for other components, and the overall structure is simple, convenient for processing and installation, and is conducive to the miniaturization design of the electric toothbrush.

[0072] In this embodiment, the specific structure of the abutment section formed by the increase in diameter can be a step transition between the abutment section and other parts of the adjacent output shaft 20, or the diameter of a part of the output shaft 20 is uniformly increased to form the abutment section, and the abutment section and other parts of the adjacent output shaft 20 have a smooth transition.

[0073] It can be understood that the structure with stepped transition is a stepped structure formed between the abutting section and the adjacent shaft section of the output shaft 20, the stepped structure has a stepped surface, and the stepped surface can be used to achieve the limited abutment with the first limiter 40. The smooth transition is that the diameter gradually increases, and the outer peripheral surface of the output shaft 20 is a smooth surface.

[0074] In this embodiment, when the abutment section and other parts of the adjacent output shaft 20 are in a stepped transition, when the output shaft 20 is forced to move axially, the step structure abuts against the first limit member 40 through the step surface, thereby limiting the axial movement distance of the output shaft 20. The abutment structure setting between the step surface and the first limit member 40 is beneficial to improving the stability of the limitation during the process of limiting the output shaft 20.

[0075] In the present embodiment, when the abutment section smoothly transitions with other parts of the adjacent output shaft 20, the output shaft 20 adopts a structure with uniformly increased diameter to form the abutment section, thereby providing a large-diameter abutment section, and when the output shaft 20 is subjected to force and moves axially, the abutment section and the first limit member 40 are abutted and limited; the smooth transition structure is adopted to facilitate the overall forming of the output shaft 20; at the same time, the smooth transition structure is conducive to gradual abutment with the first limit member 40, and gradual limitation between the abutment section and the first limit member 40, so as to avoid the abutment section and the first limit member 40 colliding and causing damage to the abutment section and the first limit member 40, which is conducive to improving the stable operation of the overall structure.

[0076] In this embodiment, if Figure 2 and Figure 4 As shown, an escape hole 321 is provided at one end of the motor housing 30 away from the through hole 310 , and the escape hole 321 allows the output shaft 20 to reciprocate along the axial direction.

[0077] Among them, an avoidance hole 321 is set on the motor housing 30 to avoid the output shaft 20 when the output shaft 20 moves axially, avoiding interference and collision between the output shaft 20 and the motor housing 30, resulting in the output shaft 20 being unable to move normally and stably.

[0078] In order to further improve the axial limit of the output shaft 20 and avoid the output shaft 20 from being misaligned in the axial direction, the motor assembly of the electric toothbrush also includes a motor bracket 50, and the driving member is arranged on the motor bracket 50. The motor bracket 50 is used to fix the driving member to protect and position the driving member, thereby ensuring the stable operation of the driving member. The motor bracket 50 includes a second limiter 510, which is arranged adjacent to the avoidance hole 321 and is used to limit the length of the avoidance hole 321 from which the output shaft 20 extends.

[0079] In this embodiment, the output shaft 20 is limited by having a second limit member 510 on the motor bracket 50. By setting the second limit member 510 adjacent to the avoidance hole 321, the second limit member 510 limits the length of the output shaft 20 extending out of the avoidance hole 321, thereby completing the limitation of the axial movement distance of the output shaft 20.

[0080] During the normal operation of the electric toothbrush and when the motor is not powered on, the second stopper 510 and the output shaft 20 are spaced apart from each other to avoid the second stopper 510 interfering with the normal movement of the output shaft 20; when the output shaft 20 moves abnormally in the axial direction, the second stopper 510 can abut against the output shaft 20 to limit the length of the output shaft 20 extending out of the avoidance hole 321, thereby limiting the axial movement of the output shaft 20. In addition, the first stopper 40 and the second stopper 510 can limit the output shaft 20 in two directions of repeated axial movement of the output shaft 20, so that no matter how the output shaft 20 is subjected to force, the output shaft 20 can be better limited, which is beneficial to the protection of the output shaft 20 and further beneficial to the improvement of the service life of the electric toothbrush.

[0081] In this embodiment, the second position-limiting member 510 is a baffle structure. Specifically, the baffle structure forms a relatively large position-limiting abutting surface. When the output shaft 20 abuts against the second position-limiting member 510, the position-limiting abutting surface provides a relatively large area for abutting against the output shaft 20, which is beneficial to improving the stability of the position-limiting. Meanwhile, the overall installation strength of the baffle structure is high, which is beneficial to improving the position-limiting strength and ensuring the stability of the overall structure.

[0082] The specific shape of the baffle structure can be a rectangular plate, a polygonal plate or a plate structure of other shapes.

[0083] In this embodiment, the first stopper 40 is used to achieve axial limit at one end of the through hole 310, so as to limit the length of the output shaft 20 extending out of the through hole 310, and the second stopper 510 is arranged at the end away from the through hole 310 to limit the length of the output shaft 20 extending out of the avoidance hole 321. The first stopper 40 and the second stopper 510 achieve axial double-sided limit of the output shaft 20, so as to ensure that the output shaft 20 will not be out of position during the axial reciprocating movement of the output shaft 20, thereby facilitating the normal operation of the electric toothbrush.

[0084] In this embodiment, the distance between the output shaft 20 and the second stopper 510 is greater than the axial movement distance of the output shaft 20 when it is working. Specifically, during the normal operation of the electric toothbrush and when the motor is not powered on, the second stopper 510 and the output shaft 20 are kept spaced from each other to avoid the second stopper 510 interfering with the normal movement of the output shaft 20; when the output shaft 20 moves abnormally in the axial direction, the second stopper 510 plays a limiting role, that is, the output shaft 20 abuts against the second stopper 510, and the second stopper 510 can limit the length of the output shaft 20 extending out of the avoidance hole 321 by abutting against the output shaft 20, thereby limiting the axial movement of the output shaft 20.

[0085] like Figure 2 , Figure 4 and Fig. 9 As shown, in order to further achieve the effect of axially limiting the output shaft 20, the motor housing 30 provided in this embodiment also includes a third limiting member 320, and the third limiting member 320 is arranged at an end away from the through hole 310. The third limiting member 320 is provided with an avoidance hole 321, and an axial magnetic ring 70 for driving the output shaft 20 to move axially is fixedly provided on the output shaft 20. The third limiting member 320 can resist the axial magnetic ring 70 to limit the length of the output shaft 20 extending out of the avoidance hole 321.

[0086] Specifically, the avoidance hole 321 is opened on the third limit member 320, and the third limit member 320 and the avoidance hole 321 are formed into one structural member. There is no need to add a new limit structure to limit the output shaft 20. The overall structure is simple, which is conducive to reducing the size of the motor assembly.

[0087] When the output shaft 20 is forced to move axially, the structural setting of the third limiter 320 can support the shaft magnetic ring 70, thereby limiting the movement of the shaft magnetic ring 70 and thus limiting the axial movement distance of the output shaft 20. The structural setting of the third limiter 320 further ensures that the output shaft 20 avoids axial movement and misalignment.

[0088] The second limit member 510 and the third limit member 320 cooperate to limit the output shaft 20. The second limit member 510 and the third limit member 320 are arranged at intervals. The second limit member 510 is used to abut the end of the output shaft 20 to limit the output shaft 20, thereby realizing multiple protections for the output shaft 20. The third limit member 320 is used to abut the shaft magnetic ring 70 to limit the output shaft 20. Since the shaft magnetic ring 70 is more susceptible to force damage than the output shaft 20, in this embodiment, the distance between the output shaft 20 and the second limit member 510 is smaller than the distance between the shaft magnetic ring 70 and the third limit member 320.

[0089] Specifically, by setting the positions of the second limit member 510 and the third limit member 320, when the output shaft 20 has abnormal axial movement, the second limit member 510 takes effect first, that is, the output shaft 20 first abuts against the second limit member 510. The second limit member 510 can abut against the output shaft 20 to limit the length of the output shaft 20 extending out of the avoidance hole 321, thereby limiting the axial movement of the output shaft 20; when the force on the output shaft 20 is large and the output shaft 20 further moves axially, the third limit member 320 further limits the output shaft 20 axially through the limiting shaft magnetic ring 70. The structural setting in which the output shaft 20 of the present application abuts against the second limit member 510 first is beneficial to protecting the shaft magnetic ring 70, preventing the shaft magnetic ring 70 from falling off due to force, and is beneficial to improving the stability of the overall structure.

[0090] In this embodiment, the first limit member 40 is used to limit the length of the output shaft 20 extending out of the hole 310, and the second limit member 510 and the third limit member 320 are used to limit the length of the output shaft 20 extending out of the avoidance hole 321. Then, the first limit member 40, the second limit member 510 and the third limit member 320 are used to realize the axial reciprocating movement distance of the output shaft 20, thereby avoiding the phenomenon of the output shaft 20 being out of position.

[0091] When the output shaft 20 moves axially in the direction of extending out of the through hole 310, the limiting structure abuts against the first limiting member 40 to limit the moving distance of the output shaft 20; when the output shaft 20 moves axially in the direction of extending out of the avoidance hole 321, the second limiting member 510 is used to abut against the output shaft 20 to achieve limiting, and at the same time the third limiting member 320 limits the output shaft 20 through the limiting shaft magnetic ring 70.

[0092] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0093] The present application adopts a limiting structure to cooperate with the first limiting member 40 to form an axial limit for the output shaft 20. When the output shaft 20 is subjected to an external force and moves axially, the limiting structure on the output shaft 20 will abut against the first limiting member 40, thereby limiting the distance of the axial movement of the output shaft 20, thereby limiting the length of the output shaft 20 extending out of the through hole 310, thereby avoiding the phenomenon in the prior art that the output shaft 20 of the motor moves axially too far after being subjected to an external force, resulting in misalignment and damage to other components.

[0094] The present application realizes limiting the output shaft 20 by providing a second limiting member 510 on the motor bracket 50. By setting the second limiting member 510 adjacent to the avoidance hole 321, the second limiting member 510 is used to limit the length of the avoidance hole 321 through which the output shaft 20 extends, thereby completing the limitation of the axial movement distance of the output shaft 20.

[0095] The structural setting of the third limiter 320 of the present application can realize the support of the shaft magnetic ring 70, and thereby limit the axial movement distance of the output shaft 20 by limiting the movement of the shaft magnetic ring 70. The structural setting of the third limiter 320 further ensures that the output shaft 20 avoids axial movement and misalignment.

[0096] Obviously, the above described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the utility model.

Claims

1. A motor assembly for an electric toothbrush, characterized in that: include: A motor housing (30) having a through hole (310); A driving member, partly arranged inside the motor housing (30), an output shaft (20) of the driving member partially passing through the through hole (310), the output shaft (20) of the driving member being capable of reciprocating in an axial direction, and a limiting structure being arranged on a portion of the output shaft (20) located inside the motor housing (30); A first limit member (40), the first limit member (40) being arranged on the motor housing (30); when the motor is not powered on, the limit structure and the first limit member (40) are spaced apart from each other; the first limit member (40) is used to limit the length of the output shaft (20) extending out of the through hole (310).

2. The motor assembly for an electric toothbrush according to claim 1, characterized in that: The first stopper (40) comprises a first portion (410) and a second portion (420) extending in the axial direction, the first portion (410) being arranged inside the through hole (310), the second portion (420) being arranged inside the motor housing (30), and one side of the second portion (420) being attached to the motor housing (30).

3. The motor assembly for an electric toothbrush according to claim 1, characterized in that: The limiting structure is a clamping member (60), a clamping groove (210) is provided on the output shaft (20), the clamping member (60) is fixedly arranged in the clamping groove (210), and the clamping member (60) is capable of abutting against the first limiting member (40).

4. The motor assembly for an electric toothbrush according to claim 3, characterized in that: The distance between the first limiting member (40) and the clamping member (60) is greater than the extended length of the output shaft (20) when it reciprocates.

5. The motor assembly for an electric toothbrush according to claim 1, characterized in that: The portion of the output shaft (20) located in the motor housing (30) has an increased diameter relative to the output shaft (20) extending out of the motor housing (30) to form an abutment section, the limiting structure being the abutment section, and the abutment section abuts against the first limiting member (40).

6. The motor assembly for an electric toothbrush according to claim 5, characterized in that: The abutment section and other parts of the adjacent output shaft (20) are in a stepped transition.

7. The motor assembly for an electric toothbrush according to claim 5, characterized in that: The diameter of a portion of the output shaft (20) is uniformly increased to form an abutment section, and the abutment section smoothly transitions to other adjacent portions of the output shaft (20).

8. The motor assembly for an electric toothbrush according to claim 1, characterized in that: The hardness of the motor housing (30) is less than the hardness of the first limiting member (40); and / or The hardness of the first limiting member (40) is less than the hardness of the output shaft (20).

9. The motor assembly for an electric toothbrush according to any one of claims 1 to 8, characterized in that: It also comprises a motor bracket (50), the driving member is arranged on the motor bracket (50), and an avoidance hole (321) is arranged at one end of the motor housing (30) away from the through hole (310), and the avoidance hole (321) allows the output shaft (20) to reciprocate in the axial direction; The motor bracket (50) comprises a second limiting member (510), the second limiting member (510) being arranged adjacent to the avoidance hole (321), the second limiting member (510) being used to limit the length of the avoidance hole (321) through which the output shaft (20) extends.

10. The motor assembly for an electric toothbrush according to claim 9, characterized in that: The second limiting member (510) is a baffle structure.

11. The motor assembly for an electric toothbrush according to claim 9, characterized in that: The motor housing (30) further comprises a third limiting member (320), wherein the third limiting member (320) is arranged at an end away from the through hole (310), and the third limiting member (320) is provided with the avoidance hole (321); The output shaft (20) is fixedly provided with a shaft magnetic ring (70) for driving the output shaft (20) to move axially, and the third limiting member (320) is capable of abutting against the shaft magnetic ring (70) to limit the length of the output shaft (20) extending out of the avoidance hole (321).

12. The motor assembly for an electric toothbrush according to claim 11, characterized in that: The distance between the output shaft (20) and the second limiting member (510) is smaller than the distance between the shaft magnetic ring (70) and the third limiting member (320); and / or The distance between the output shaft (20) and the second position-limiting member (510) is greater than the axial movement distance of the output shaft (20) when in operation.

13. An electric toothbrush, characterized in that: A motor assembly for an electric toothbrush comprising any one of claims 1 to 12.

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