CN214315002U

CN214315002U - Motor for electric toothbrush

Info

Publication number: CN214315002U
Application number: CN202120417688.9U
Authority: CN
Inventors: 蒋婷觅; 郭凡美
Original assignee: Nantong Xiangfang Electromechanical Technology Co Ltd
Current assignee: Nantong Xiangfang Electromechanical Technology Co Ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-09-28
Anticipated expiration: 2031-02-25

Abstract

The utility model provides a motor for an electric toothbrush, which comprises a shell and a motor shaft which is rotatablely supported on the shell by a bearing, wherein the bearing is fixed in the shell; the motor for the electric toothbrush further comprises a rear cover and a spring arranged in the rear cover, the shell and the rear cover are two mutually independent parts and are fixed with each other, the spring comprises a spring body part and spring arm parts extending from two ends of the spring body part, the spring body part is fixed with the end part of the motor shaft, and one end, far away from the spring body part, of the spring arm part is fixed with the rear cover. This application is fixed the spring in the back lid independent of shell, sets up the spring into spring body portion and two spring arm portions that set up respectively at spring body portion tip for the spring can elastic deformation in the Z direction, thereby improves the spring greatly and resists Z to the ability of assaulting, guarantees the elastic restoring force that the spring applyed to the motor shaft, guarantees the job stabilization nature of motor for electric toothbrush.

Description

Motor for electric toothbrush

Technical Field

The utility model relates to a motor for an electric toothbrush.

Background

The electric toothbrush mainly comprises a motor (namely a motor) and a brush head, wherein the brush head generates high-frequency vibration through the rapid operation of the motor, so that toothpaste is instantly decomposed into fine foam to deeply clean teeth gaps; meanwhile, the vibration of the brush hair on the brush head can promote the blood circulation in the oral cavity, and has a certain massage effect on the gum tissue. Thus, the motor is a major component of the electric toothbrush.

The existing motor for electric toothbrush mainly includes two stator cores, a magnet matched with each stator core, a motor shaft fixed with the magnet, and a coil winding wound on each stator core, such as the motor disclosed in the chinese utility model patent with application number 201921442559.4.

Further, the motor shaft restoring force of the motor for the electric toothbrush is generally implemented in two forms of magnetic force and spring force, wherein the spring force is implemented at a lower cost and is more applied. In this way, the motor for the electric toothbrush is further provided with a spring connected to a motor shaft, and the spring is fixed in a rear cover of the motor for the electric toothbrush. Meanwhile, a bearing for supporting the motor shaft is fixed in the rear cover, that is, the rear cover for fixing the spring and the rear cover for fixing the bearing are integrated and are the same rear cover, which requires that the spring must pass through an inner hole of the bearing, thereby limiting the motor for the electric toothbrush to use only a slender spring. However, the elongated spring is hardly elastically deformable in the Z direction (i.e., the axial direction of the motor shaft), and is easily bent and deformed when an impact force is applied in the Z direction, thereby affecting the elastic recovery of the motor shaft.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, the present invention provides a motor for an electric toothbrush, which can improve the Z-direction impact resistance of a spring.

In order to achieve the above object, the present invention provides a motor for an electric toothbrush, comprising a housing and a motor shaft rotatably supported to the housing by a bearing, the bearing being fixed in the housing; the motor for the electric toothbrush further comprises a rear cover and a spring arranged in the rear cover, the shell and the rear cover are two mutually independent parts and are fixed with each other, the spring comprises a spring body part and spring arm parts extending from two ends of the spring body part, the spring body part is fixed with the end part of the motor shaft, and one end, far away from the spring body part, of the spring arm part is fixed with the rear cover.

Furthermore, a clamping groove is formed in the end portion of the motor shaft, and the spring body portion is clamped in the clamping groove of the motor shaft in a tight fit mode.

Furthermore, a connecting hole is formed in the rear cover, a straight and extended connecting section is arranged at one end, far away from the spring body, of the spring arm part, and the connecting section is inserted into the connecting hole of the rear cover in a tight fit mode.

Further, the spring body is a circular arc section.

Further, the spring arm portion is a V-shaped section including a first inclined section connected to the spring body portion and a second inclined section connected to the first inclined section, the first inclined section obliquely extends inward farther from the spring body portion, and the second inclined section obliquely extends outward farther from the spring body portion.

Further, the spring is a unitary piece.

Further, the motor for the electric toothbrush further comprises at least one pair of magnetic components fixed on the periphery of the motor shaft, a stator core matched with the magnetic components and fixed with the shell, and a single-side coil winding fixed on the shell, wherein the stator core comprises at least one pair of core main body parts and a magnetic conduction shell part matched with the single-side coil winding, the core main body parts are arranged on the periphery of each magnetic component and matched with the magnetic components, and the magnetic conduction shell part is in magnetic conduction fit with each core main body part.

Further, the core main body part and the magnetic conduction shell part are two mutually independent parts and are in contact with each other, so that the stator core is a split part.

As described above, the motor for an electric toothbrush according to the present invention has the following advantageous effects:

in this application, fix the spring in the back lid independent of shell, set up the spring into spring body portion and two spring arm portions that set up respectively at spring body portion tip for the spring can elastic deformation in the Z direction, thereby improve the ability that the spring resisted Z to assault greatly, guarantee the elastic restoring force that the spring applyed to the motor shaft, guarantee the job stabilization nature of motor for electric toothbrush.

Drawings

Fig. 1 is a schematic view showing a structure of a motor for an electric toothbrush according to the present application.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

Fig. 4 is a sectional view taken along line B-B of fig. 2.

Fig. 5 is a schematic structural diagram of a spring in the present application.

Fig. 6 and 7 are schematic structural views of the stator core in different states in the present application.

Description of the element reference numerals

10 outer casing

11 fixed slot

12 clamping groove

20 bearing

30 motor shaft

31 card slot

40 rear cover

41 connecting hole

50 spring

51 spring body part

52 spring arm

521 connecting segment

522 first inclined section

523 second inclined section

60 magnetic component

61 magnet steel

70 stator core

71 iron core body part

72 magnetic conductive casing part

721 coil fitting part

Connecting part 722

723 bending part

80 single-side coil winding

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the drawings of the present application are only used to match the contents disclosed in the specification, so as to be known and read by those skilled in the art, and not to limit the practical limitations of the present invention, so that the present application does not have any technical significance, and any modification of the structure, change of the ratio relationship, or adjustment of the size should still fall within the scope of the present application without affecting the function and the achievable purpose of the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be considered as the scope of the present invention without substantial changes in the technical content.

The application provides a motor for an electric toothbrush. As shown in fig. 1 to 4, the present application provides a motor for an electric toothbrush comprising a housing 10, a motor shaft 30 rotatably supported in the housing 10 by bearings 20, at least one pair of magnetic members 60 fixed to an outer circumference of the motor shaft 30, a stator core 70 fitted to the magnetic members 60 and fixed to the housing 10, a single-sided coil winding 80 fixed to the housing 10, a rear cover 40, and a spring 50 disposed inside the rear cover 40; the bearing 20 is fixed in the housing 10; the motor shaft 30 is made of a magnetic conductive material; the stator core 70 includes at least a pair of core body portions 71 and a magnetic conductive housing portion 72 that is fitted to the single-side coil winding 80, each core body portion 71 is provided on the outer peripheral side of each magnetic member 60 and fitted to each magnetic member 60 in a one-to-one correspondence, and the magnetic conductive housing portion 72 is fitted to each core body portion 71 in a magnetic conductive manner; the shell 10 and the rear cover 40 are two independent parts and are fixed with each other; as shown in fig. 5, the spring 50 includes a spring body 51 and spring arms 52 extending from both ends of the spring body 51, the spring body 51 is fixed to the end of the motor shaft 30, and one end of the spring arm 52 away from the spring body 51 is fixed to the rear cover 40. The rear end of the motor shaft 30, to which the spring 50 is connected, protrudes rearward from the housing 10 and is accommodated in the rear case, and the front end of the motor shaft 30 protrudes forward from the housing 10.

In the motor for the electric toothbrush, a brush head is fixed on a motor shaft 30 of the motor for the electric toothbrush; when the motor for the electric toothbrush works, alternating current is introduced into the unilateral coil winding 80, and under the combined action of the magnetic component 60, the stator iron core 70 and the unilateral coil winding 80, the motor shaft 30 is driven to swing left and right, and the motor shaft 30 drives the brush head to swing quickly; at the same time, the motor shaft 30 drives the spring 50 to swing together, and the restoring force of the motor shaft 30 is provided by the force of the spring 50. The motor for the electric toothbrush having the above structure has the following advantages:

1. the spring 50 is fixed in the rear cover 40 independent from the housing 10, and the spring 50 is provided with the spring body 51 and two spring arm parts 52 respectively provided at the ends of the spring body 51, so that the spring 50 can be elastically deformed in the Z direction, thereby greatly improving the ability of the spring 50 to withstand the Z-direction impact, ensuring the elastic restoring force of the spring 50 to the motor shaft 30, and ensuring the working stability of the motor for the electric toothbrush. The Z direction referred to herein is an axial direction of the motor shaft 30.

2. The structure of a single stator core 70 is adopted, the stator core 70 is arranged into two parts of a magnetic conduction shell part 72 and an iron core main body part 71 which are in magnetic conduction fit, and only the magnetic conduction shell part 72 is matched with a coil winding, so that the motor for the electric toothbrush is only provided with one coil winding, and the motor for the electric toothbrush adopts the structure of a single-side coil winding 80; when an alternating current is supplied to the single-side coil winding 80, the magnetic conductive housing portion 72 of the stator core 70 generates a magnetic path and transmits the magnetic path to the core main body portion 71. Therefore, only one coil winding can be configured, the structure of adopting the unilateral coil winding 80 is realized, the cost is effectively reduced on the premise of ensuring the performance advantage of the motor for the electric toothbrush, and the size of the motor for the electric toothbrush is favorably reduced.

Further, the outer shell 10 and the rear cover 40 are injection molded parts, and the outer shell 10 and the rear cover 40 can have various shapes, such as a cylinder shape, a square barrel shape, and the like, so that the outer shell 10 and the rear cover 40 have various shapes to meet different individual requirements. In addition, the housing 10 and the rear cover 40 are fixedly connected by a plurality of screws.

Further, as shown in fig. 4, a slot 31 is formed at the rear end of the motor shaft 30, and the spring body 51 is tightly engaged with the slot 31 of the motor shaft 30, so that the spring body 51 is fixedly connected to the rear end of the motor shaft 30. In addition, the locking groove 31 extends backwards to the rear end face of the motor shaft 30, and after the spring body 51 is locked in the locking groove 31, the locking groove 31 can be pressed, so that the reliability of the fixed connection between the locking groove 31 and the spring body 51 is improved. In addition, a connection hole 41 is formed in the rear cover 40, a connection section 521 extending straight is formed at an end of the spring arm 52 away from the spring body 51, and the connection section 521 is inserted into the connection hole 41 of the rear cover 40 in a tight fit manner, so that the end of the spring arm 52 is fixedly connected to the rear cover 40.

Further, the preferred structure of the spring 50 is: as shown in fig. 5, the spring body 51 is a circular arc segment; each spring arm portion 52 is a V-shaped section including a first inclined section 522 connected to the spring body portion 51 and a second inclined section 523 connected to the first inclined section 522, the first inclined section 522 being inclined to extend further inward from the spring body portion 51, and the second inclined section 523 being inclined to extend further outward from the spring body portion 51; the connecting section 521 extends straight outwardly from an end of the second inclined section 523 remote from the first inclined section 522. Additionally, the spring 50 is a unitary piece.

Further, as shown in fig. 3, the magnetic members 60 are provided only in one pair; accordingly, only one pair of core main bodies 71 is disposed in the stator core 70, and the core main bodies 71 are provided on the outer circumferential side of the magnetic member 60. Preferably, each magnetic member 60 is bipolar, having an N pole and an S pole; in this embodiment, each magnetic member 60 includes two magnetic steels 61 with different polarities, the two magnetic steels 61 forming each magnetic member 60 are disposed closely along the circumferential direction of the motor shaft 30 and extend along the axial direction of the motor shaft 30, and a gap is formed between the two magnetic members 60 connected to each other in the circumferential direction of the motor shaft 30.

Further, as shown in fig. 6 and 7, the stator core 70 is a separate component, that is, the core main body portion 71 and the magnetically permeable housing portion 72 are two independent components, and one end of the core main body portion 71 away from the magnetic member 60 is in contact with the inner wall of the magnetically permeable housing portion 72, thereby achieving magnetically permeable engagement between the core main body portion 71 and the magnetically permeable housing portion 72. The core main body portion 71 has a Y-shape, and an end surface of the core main body portion 71 facing the magnetic member 60 is an arc surface, so that a portion of the core main body portion 71 close to the magnetic member 60 is an arc segment. The pair of iron core main bodies 71 are distributed at intervals of 180 degrees; the magnetic conductive housing part 72 is an integrally formed part, the magnetic conductive housing part 72 includes a coil matching part 721 extended straight and two connection parts 722 extended perpendicularly from the end of the coil matching part 721, the coil matching part 721 is inserted into the single-side coil winding 80, and the two connection parts 722 are in one-to-one correspondence with the two core body parts 71 for magnetic conduction.

Further, the fixing manner between the stator core 70 and the housing 10 is: as shown in fig. 3, the housing 10 is provided with fixing grooves 11 for engaging with the Y-shaped core body portions 71, so that only the core body portions 71 are fixed to the housing 10; the fixing structure between the magnetic conduction shell part 72 and the casing 10 is: as shown in fig. 1, the outer wall of the housing 10 is provided with a plurality of snap grooves 12, the magnetically conductive housing portion 72 is provided with a bent portion 723 at each snap groove 12, the bent portion 723 preferably integrally extends from the connecting portion 722, and the bent portion 723 is snapped into the snap grooves 12. When the stator core 70 and the single-side coil winding 80 are assembled, the core body portion 71 is separated from the magnetic conductive housing portion 72, and at this time, the magnetic conductive housing portion 72 is wound to form the single-side coil winding 80; in the winding process, the Y-shaped core main body portion 71 is in a separated state, so that it does not interfere with the winding, which is advantageous for winding. As shown in fig. 6, before the core body 71 is assembled, the bent portion 723 is in a flat state and is not engaged with the housing 10. After the winding is finished, the core body 71 and the shell 10 are installed, and the core body 71 is clamped in the fixing groove 11 of the shell 10; thereafter, the bent portion 723 of the magnetically permeable housing portion 72 is bent, and as shown in fig. 7, the bent portion 723 is engaged with the engaging groove 12 of the housing 10, so that the magnetically permeable housing portion 72 and the housing 10 are fixed to each other, thereby fixing the stator core 70 and the housing 10.

To sum up, the utility model discloses various shortcomings in the prior art have effectively been overcome and high industry value has.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A motor for an electric toothbrush, comprising a housing (10), and a motor shaft (30) rotatably supported to the housing (10) by a bearing (20), the bearing (20) being fixed in the housing (10), characterized in that: the motor shaft spring comprises a shell (10), a rear cover (40) and a spring (50) arranged in the rear cover (40), wherein the shell (10) and the rear cover (40) are two mutually independent parts and are fixed with each other, the spring (50) comprises a spring body part (51) and spring arm parts (52) extending out of two ends of the spring body part (51), the spring body part (51) is fixed with the end part of the motor shaft (30), and one end, far away from the spring body part (51), of the spring arm part (52) is fixed with the rear cover (40).

2. The motor for an electric toothbrush according to claim 1, wherein: the end part of the motor shaft (30) is provided with a clamping groove (31), and the spring body part (51) is clamped in the clamping groove (31) of the motor shaft (30) in a tight fit manner.

3. The motor for an electric toothbrush according to claim 1, wherein: a connecting hole (41) is formed in the rear cover (40), a straight extending connecting section (521) is arranged at one end, away from the spring body part (51), of the spring arm part (52), and the connecting section (521) is inserted into the connecting hole (41) of the rear cover (40) in a tight fit mode.

4. The motor for an electric toothbrush according to claim 1, wherein: the spring body part (51) is an arc section.

5. The motor for an electric toothbrush according to claim 1, wherein: the spring arm portion (52) is a V-shaped section, the V-shaped section comprises a first inclined section (522) connected with the spring body portion (51) and a second inclined section (523) connected with the first inclined section (522), the first inclined section (522) extends in an inclined mode in a mode that the inclined section is more inward when the inclined section is farther away from the spring body portion (51), and the second inclined section (523) extends in an inclined mode that the inclined section is more outward when the inclined section is farther away from the spring body portion (51).

6. The motor for an electric toothbrush according to any one of claims 1 to 5, wherein: the spring (50) is a unitary piece.

7. The motor for an electric toothbrush according to claim 1, wherein: still including fixing at least a pair of magnetic part (60) in motor shaft (30) periphery, cooperate and with shell (10) fixed stator core (70) mutually with magnetic part (60) and be fixed in unilateral coil winding (80) of shell (10), stator core (70) include at least a pair of iron core main part (71) and with unilateral coil winding (80) matched with lead magnetic shell portion (72), iron core main part (71) set up at the periphery side of each magnetic part (60), cooperate with magnetic part (60), lead magnetic shell portion (72) and each iron core main part (71) all magnetism conduction fit.

8. The motor for an electric toothbrush according to claim 7, wherein: the iron core main body part (71) and the magnetic conduction shell part (72) are two mutually independent components and are in contact with each other, so that the stator iron core (70) is a split piece.