CN215349670U

CN215349670U - Transmission structure of electric toothbrush and electric toothbrush

Info

Publication number: CN215349670U
Application number: CN202023248938.5U
Authority: CN
Inventors: 李冬保
Original assignee: Jiangxi Ruishengte Technology Co ltd
Current assignee: Jiangxi Ruishengte Technology Co ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-12-31
Anticipated expiration: 2030-12-29

Abstract

The utility model relates to a transmission structure of an electric toothbrush, which comprises a transmission rod, a motor, a connecting rod and an eccentric wheel, wherein one end of the connecting rod is connected with an output shaft of the motor, the other end of the connecting rod is connected with a second end of the eccentric wheel, a first end of the eccentric wheel is inserted into a cavity at the top of the transmission rod, the first end and the second end of the eccentric wheel are cylinders with the same axis, a first connecting part is arranged at the first end of the eccentric wheel, the first connecting part is in a spherical or ellipsoidal shape, and the first end of the eccentric wheel is in contact with the top of the transmission rod through the first connecting part. The eccentric wheel is connected with the bearing fixed at the top of the transmission rod through the spherical or ellipsoidal first connecting part, and the first connecting part is in line contact with the inner wall of the bearing, so that the friction force is small, the condition that the eccentric wheel is clamped to cause overlarge current is effectively avoided, the vibration effect is better, and the cleaning effect is good.

Description

Transmission structure of electric toothbrush and electric toothbrush

Technical Field

The utility model belongs to the technical field of electric toothbrushes, relates to a transmission structure of an electric toothbrush, and mainly relates to an improvement scheme of an eccentric wheel.

Background

The transmission of the electric toothbrush is a connection between the motor and the toothbrush head to convert the rotation of the motor into the vibration of the toothbrush head, so that the vibrating head cleans the teeth.

In the prior art, one end of an eccentric wheel of an electric toothbrush is connected to a motor through a connecting rod, and the other end of the eccentric wheel is connected with a transmission rod. The eccentric wheel is connected with the connecting rod and the transmission rod in an interference fit manner through the shaft hole, and an integrated fastening assembly mode is realized. In the working process of the toothbrush, the connection structure is easy to cause that two ends of the eccentric wheel are pressed tightly, so that the motor is stressed too much, too much current and noise are generated, and the service lives of a battery and a transmission structure are influenced;

in addition, two ends of the existing eccentric wheel are in surface-mounted close contact with the transmission rod or the connecting rod, the friction force is large, the eccentric effect generated when the motor is driven is poor, the vibration effect of the transmission rod is poor, the tooth cleaning force is insufficient, and the oral hygiene of a user is affected.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects and shortcomings in the prior art, the utility model aims to provide the transmission structure of the electric toothbrush, which has the advantages of simple process, good eccentric effect and good user experience.

In order to achieve the above object, the present invention is achieved by the following technical means.

This technical scheme is a transmission structure of electric toothbrush, including transfer line, motor, connecting rod and eccentric wheel, the one end of connecting rod links to each other with the output shaft of motor, and its other end links to each other with the second end of eccentric wheel, and the first end of eccentric wheel is inserted and is installed in the bearing at transfer line top, and the first end and the second end of eccentric wheel are the cylinder of same axis, are provided with first connecting portion on first end, and first connecting portion are the spheroid form or ellipsoid form, and the first end of eccentric wheel contacts with the bearing through first connecting portion.

Compared with the prior art, the technical scheme has the technical effects that the eccentric wheel is connected with the bearing fixed at the top of the transmission rod through the spherical or ellipsoidal first connecting part, the first connecting part is in line contact with the inner wall of the bearing, so that the friction force is small, the condition that the eccentric wheel is clamped by the clamping to cause overlarge current is effectively avoided, the vibration effect is better, and the cleaning effect is good.

In a preferred example of this embodiment, the maximum cross-sectional diameter of the first connecting portion in a direction perpendicular to the axis of the first end is larger than the diameter of the cross-section of the cylindrical body of the first end. The diameter of the cross section of the cylinder is small, so that the cylinder can be prevented from contacting with the bearing, and the first connecting part is ensured to contact with the bearing.

Furthermore, the maximum cross-sectional diameter of the first connecting part is A, and A is more than or equal to 1mm and less than or equal to 2 mm; the diameter of the cross section of the cylinder at the first end is B, and B is more than or equal to 0.7mm and less than or equal to 1.7 mm.

In a preferred example of this embodiment, the first connecting portion and the first end are of a unitary structure.

In a preferred example of the technical scheme, a sealing plug is further arranged at the top of the rotating rod, the sealing plug is positioned on the outer side of the bearing, and the sealing plug is used for sealing the top end of the transmission rod. The top end opening of transfer line to more the bearing of easy to assemble, through the sealed top end opening of sealing plug, avoid water to get into the core inside from the top end opening.

In a preferred example of the technical scheme, a second connecting part is arranged at the second end of the eccentric wheel, the second connecting part is in a spherical shape or an ellipsoidal shape, and the second end of the eccentric wheel is connected with the connecting part through the second connecting part. The eccentric wheel is connected with the connecting rod through the spherical or ellipsoid second connecting part, the contact area between the eccentric wheel and the connecting rod is smaller, the friction force between the eccentric wheel and the connecting rod is small, the eccentric amplitude is effectively increased, the eccentric effect is better, and the transmission effect is good.

In a preferred example of this embodiment, the maximum cross-sectional diameter of the second connecting portion in the direction perpendicular to the axis of the second end is larger than the diameter of the cross-section of the cylindrical body of the second end.

In a preferred example of this solution, the second connecting portion is integrally formed with the second end.

In a preferred example of the technical scheme, the connecting rod comprises a metal connecting rod, a motor connecting seat and an eccentric wheel connecting seat, the motor connecting seat and the eccentric wheel connecting seat are respectively connected to two ends of the metal connecting rod, a concave part is arranged on the eccentric wheel connecting seat, and the second end is in contact with the concave part through a second connecting part.

Drawings

Fig. 1 shows a schematic view of the structure of an electric toothbrush in an embodiment of the present application.

Fig. 2 shows a schematic cross-sectional view of the electric toothbrush in the embodiment of the present application.

Fig. 3 is a partially enlarged view of fig. 2.

Fig. 4 is a partially enlarged view of fig. 2.

Fig. 5 shows an exploded view of the structure of the electric toothbrush in the embodiment of the present application.

Fig. 6 shows a schematic structural view of the eccentric wheel in the embodiment of the present application.

Fig. 7 shows a schematic view of the second end of the eccentric of the electric toothbrush in other embodiments.

Detailed Description

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.

Referring to fig. 1 to 6, the present embodiment is an electric toothbrush, which includes a handle and a brush head 2 detachably connected to the handle 1, the brush head generally includes an elongated neck and a head for cleaning teeth, the head has bristles 21 for cleaning teeth, and the brush head is further provided with a soft tongue scraper 22 on an opposite side of the bristles in order to clean tongue coating and prevent the head from hurting the teeth during tooth brushing.

The handle includes shell 11, and the shell is formed with the inner chamber, sets up core subassembly in the inner chamber, and the core subassembly includes motor 12, battery 13, circuit board 14 and core support 15, and motor, battery and circuit board are installed on the core support, and charging coil 131 provides to charge for battery 13.

The circuit board 14 is provided with a switch 141, which may be an on/off switch and/or a mode selection switch. The inner cavity or the circuit board is also provided with a light-emitting piece 142 which is electrically connected with the circuit board, the light-emitting piece can be provided with a plurality of light-emitting elements, a light-shielding piece 143 is arranged between the light-emitting elements, the light-shielding piece limits the light of each light-emitting element to the related mark, the unrelated mark is prevented from being illuminated due to light crosstalk, a user is enabled to be confused, and the light-shielding piece can be plastic or E VA cotton. The housing 11 is further provided with a key opening 111 and an indicator opening 112, and a sealing member 113 covers the sealing opening to prevent water from entering the interior of the housing. The keys 114 are mounted on the display panel 115 and are mounted in the housing 11 together with the display panel.

In order to transmit the vibration of the motor to the brush head, this is achieved by a transmission structure which mainly comprises a connecting rod 16, an eccentric wheel 17 and a transmission rod 18. The lower end of the transmission rod is connected to the shell 11 through a soft rubber sleeve 181, and the soft rubber sleeve ensures that the transmission rod transmits vibration to the shell in a reduction mode when vibrating.

A bearing 19 is provided on the inner side of the end of the drive rod close to the brush part, and the bearing may be formed integrally with the drive rod or as a separate component from the drive rod. When the bearing and the transmission rod are different parts, the top end of the transmission rod is provided with an opening for conveniently mounting the bearing on the transmission rod; to avoid water entering through the top opening of the drive rod, the top opening of the drive rod is sealed by a sealing plug 182.

An eccentric 17 is arranged in the inner cavity of the driving rod 18 to rotate, the rotation of the eccentric causes the driving rod to vibrate, a first end 171 of the eccentric is connected with the output end of the motor through a connecting rod, and the first end 171 is inserted into the bearing 19. The eccentric is integrally formed with a first cylindrical end 171, a weight portion 172 having a substantially C-shaped cross section, and a second cylindrical end 173. The material of the weight 172 of the eccentric is metal. The first end of the eccentric is inserted into the bearing portion of the drive rod by mounting the drive rod on the housing in a manner that covers the eccentric and the connecting rod.

In the length direction of the eccentric wheel, the central shaft of the first end and the central shaft of the second end are approximately positioned on the same straight line. And the central shaft of the first end and the central shaft of the second end extend along the length direction of the counterweight part of the eccentric wheel. The center of gravity of the weight portion is shifted outward from the center axis. In other words, the weight portion is eccentric with respect to the rotational center axis of the eccentric.

The connecting rod 16 includes a metal connecting rod 161, a motor connecting seat 162 and an eccentric wheel connecting seat 163, the motor connecting seat and the eccentric wheel connecting seat are respectively connected to two ends of the metal connecting rod, a concave portion is provided on the eccentric wheel connecting seat, the second end is in contact with the concave portion through a second connecting portion, and the structure of the connecting rod can refer to the prior application with publication number CN 205795843U.

The first end and the second end of the eccentric wheel are cylinders with the same axis, a first connecting part 1711 is arranged on the first end, the first connecting part is in a spherical shape, the first end 17 of the eccentric wheel is in contact with the bearing 19 through the first connecting part 1711, a second connecting part 1731 is arranged on the second end 173 of the eccentric wheel, the second connecting part is in a spherical shape, and the second end of the eccentric wheel is connected with the connecting rod through the second connecting part 1731.

A recess 1631 is formed in the eccentric wheel connecting holder 163, and a second end of the eccentric wheel is inserted into and fitted into the recess 1631. In order to make the eccentric wheel have larger eccentricity and more directions of movement, the second connecting part 1731 at the second end of the eccentric wheel is a sphere, the diameter of the sphere is larger than the diameter of the cross section of the cylinder at the second end, and the second end is in contact with the concave part through a point on the sphere, so that the friction force is reduced, the energy utilization rate of the motor is improved, and the electric toothbrush has larger vibration amplitude and more directions of movement.

The user turns on the electric toothbrush to drive the motor, and the eccentric wheel and the connecting rod rotate integrally with the output end of the motor by means of the power transmitted from the output end of the motor. When the eccentric wheel rotates, the outer peripheral surface of the first end of the eccentric wheel slides relative to the inner peripheral surface of the bearing, and the eccentric wheel can rotate in a state that the outer peripheral surface of the first end is in contact with the inner peripheral surface of the bearing.

In order to avoid the eccentric wheel from being compressed in the bearing to cause the motor to accept too much, the first connecting part is in a spherical shape, the diameter of the sphere is larger than the diameter of the cross section of the first end cylinder, the first end is in contact with the bearing through a point on the sphere, the friction force is reduced, the energy utilization rate of the motor is improved, and the electric toothbrush has larger vibration amplitude and more moving directions. In the present embodiment, since the outer peripheral surface of the first connecting portion is always pressed against the inner peripheral surface of the bearing, the eccentric can be rotated stably, and rattling noise such that the outer peripheral surface of the first connecting portion strikes the inner peripheral surface of the bearing can be suppressed, and noise caused by vibration of the eccentric can be reduced.

The first connecting portion and the first end are integrally formed, and the second connecting portion and the second end are integrally formed. Furthermore, the first connecting portion, the first end, the second connecting portion, the second end and the counterweight portion are integrally formed. The first connecting part has a sphere diameter A, and A is more than or equal to 1mm and less than or equal to 2 mm. The cross section of the first end has a diameter B, and B is more than or equal to 0.7mm and less than or equal to 1.7 mm.

The spherical first connecting part at the first end is a main technical feature of the transmission structure of the electric toothbrush with good eccentric effect and good user experience, so that in other embodiments, the second end may not be modified, and the prior art connecting manner is adopted, for example, if the chamfer 1732 is only performed at the end part of the second end, the chamfer may be rounded or chamfered, as shown in fig. 7.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the utility model is not to be considered limited to those descriptions. It will be apparent to those skilled in the art that a number of simple derivations or substitutions can be made without departing from the inventive concept.

Claims

1. The utility model provides a transmission structure of electric toothbrush, its characterized in that, includes transfer line, motor, connecting rod and eccentric wheel, the one end of connecting rod links to each other with the output shaft of motor, its other end links to each other with the second end of eccentric wheel, the first end of eccentric wheel is inserted and is installed in the cavity at transfer line top, the first end and the second end of eccentric wheel are the cylinder of same axis, be provided with first connecting portion on first end, first connecting portion are the spheroid form or ellipsoid form, the first end of eccentric wheel contacts with the transfer line top through first connecting portion.

2. The transmission structure of an electric toothbrush according to claim 1, wherein a maximum sectional diameter of the first coupling portion in a direction perpendicular to the axis of the first end is larger than a diameter of a cross section of the cylindrical body of the first end.

3. The transmission structure of the electric toothbrush according to claim 2, wherein the maximum cross-sectional diameter of the first connecting portion is A, A satisfies 1mm ≤ A ≤ 2 mm; the diameter of the cross section of the cylinder at the first end is B, and B is more than or equal to 0.7mm and less than or equal to 1.7 mm.

4. The transmission structure of an electric toothbrush according to claim 1, wherein the first connecting portion is integrally formed with the first end.

5. The transmission structure of an electric toothbrush according to claim 1, wherein a bearing and a sealing plug are further provided on the top of the transmission rod, the sealing plug is located outside the bearing, and the sealing plug is used for sealing the top end of the transmission rod.

6. The transmission structure of an electric toothbrush according to claim 1, wherein a second connecting portion is provided at the second end of the eccentric wheel, the second connecting portion is spherical or ellipsoidal, and the second end of the eccentric wheel is connected to the connecting rod through the second connecting portion.

7. The transmission structure of an electric toothbrush according to claim 6, wherein a maximum sectional diameter of the second connecting portion in a direction perpendicular to the axis of the second end is larger than a diameter of a cross section of the cylindrical body of the second end.

8. The transmission structure of an electric toothbrush according to claim 6, wherein the second connecting portion is integrally formed with the second end.

9. The transmission structure of an electric toothbrush according to claim 1, wherein the connecting rod includes a metal connecting rod, a motor connecting seat and an eccentric wheel connecting seat, the motor connecting seat and the eccentric wheel connecting seat are respectively connected to both ends of the metal connecting rod, a recess is formed in the eccentric wheel connecting seat, and the second end is in contact with the recess through a second connecting portion.

10. An electric toothbrush comprising the transmission structure of the electric toothbrush according to any one of claims 1 to 9.