CN219345348U - Flexible spring and transmission assembly - Google Patents

Abstract

The utility model discloses a flexible spring and a transmission assembly, wherein the flexible spring comprises an axis, a spring body, a second connecting part and a mounting part, wherein the spring body is composed of a first connecting part with first rigidity, an annular body with second rigidity, the mounting part is arranged in a cavity, a first hole penetrating through the mounting part along the axis direction is arranged on the mounting part, the annular body circumferentially surrounds the axis to form a closed-loop cavity, the axis penetrates through the center point of the cavity, the first connecting part is provided with a first end which is operatively engaged with the inner peripheral surface of the annular body, and a second end which is operatively engaged with the outer peripheral surface of the mounting part, the first connecting part extends in the radial direction of the axis, the second connecting part comprises a first section which is integrally penetrated and arranged with the annular body, and a second section which protrudes from the end surface of the annular body, and the protruding direction extends along the axis. The flexible spring has the advantages of simple process, low processing cost, high practicability and the like.

Description

Flexible spring and transmission assembly

Technical Field

The present utility model relates to personal care appliances, and in particular, to a flexible spring and transmission assembly.

Background

The electric toothbrush drives the spring through the motor to enable the brush head of the electric toothbrush to generate high-frequency vibration, and the toothpaste is instantaneously decomposed into fine foam to deeply clean the gaps between the teeth, so that the purpose of whitening the teeth is achieved.

In the related art, the spring structure of the electric toothbrush has complex process and higher processing and manufacturing cost.

Disclosure of Invention

The present utility model has been made based on the findings and knowledge of the inventors regarding the following facts and problems:

in the related art, the spring structure of the electric toothbrush is complicated in process, for example: the patent number CN 113543748A-flexible spring and motor assembly, the processing and manufacturing cost of providing a plurality of protruding sheets on the rotating member is high, and the manufacturing process is complex.

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the utility model provides the flexible spring which is simple in structure and low in processing and manufacturing cost.

The embodiment of the utility model provides a transmission assembly with low cost and simple process.

The flexible spring of the embodiment of the utility model comprises: an axis; a spring body formed of a first connection portion having a first stiffness and an annular body having a second stiffness, wherein the annular body surrounds a closed-loop chamber along a circumference of the axis, the axis passing through a center point of the chamber; the first connecting portion having a first end operatively engaged with an inner peripheral surface of the annular body and a second end operatively engaged with an outer peripheral surface of the mounting portion, the first connecting portion extending in a radial direction of the axis; the mounting part is arranged in the cavity and is provided with a first hole penetrating through the mounting part along the axis direction; the second connecting part comprises a first section integrally penetrating with the annular body and a second section protruding from the end face of the annular body, and the protruding direction extends along the axis; when the mounting part circumferentially rotates along the axis, the spring body elastically deforms, so that the second connecting part resists the rotation of the mounting part; when the second connecting part circumferentially rotates along the axis, the spring body elastically deforms, so that the mounting part resists the rotation of the second connecting part.

According to the flexible spring provided by the embodiment of the utility model, the annular body, the mounting part, the first connecting part and the second connecting part are arranged, so that the structure of the flexible spring is simplified, the processing and manufacturing process is reduced, and the processing and manufacturing cost of the flexible spring is reduced.

In some embodiments, the first connection portion has an orientation that gradually expands from an inner peripheral surface of the annular body to an outer peripheral surface of the mounting portion as seen in a cross section of an extension line of the first connection portion, with a perpendicular component to the extension line of the first connection portion.

In some embodiments, the first connecting portions are a plurality of, the plurality of first connecting portions are disposed at intervals along the circumference of the axis, and/or the second connecting portions are a plurality of, the plurality of second connecting portions are disposed at intervals along the circumference of the axis.

In some embodiments, the connection position between the first end of the first connection portion and the inner circumferential surface of the annular body is a connection position, and the connection position and the first section of the second connection portion are arranged at intervals in the circumferential direction of the axis.

In some embodiments, the peripheral profile of the first hole comprises a straight section and an arc section, one end of the straight section is connected with one end of the arc section, the other end of the straight section is connected with the other end of the arc section, and the arc length of the arc section is greater than one half of the circle in which the arc section is located; or, the peripheral outline of the first hole is circular.

In some embodiments, the outer peripheral surface of the annular body is circular or elliptical in profile.

In some embodiments, the peripheral contour of the second segment of the second connection is located within the peripheral contour of the first segment, or the peripheral contour of the second segment of the second connection coincides with the peripheral contour of the first segment, as seen in the axial direction.

The transmission assembly of the embodiment of the utility model comprises: the mass block is provided with a third connecting part and is used for adjusting the resonance frequency of the transmission assembly; a flexible spring according to any one of the above embodiments, wherein the second connecting portion of the flexible spring is mated with the third connecting portion so that the mass is connected to the flexible spring; when the mounting part of the flexible spring is excited to rotate, the spring body generates elastic deformation, so that the second connecting part resists the rotation of the mounting part to realize the resonance of the transmission assembly; or when the mass block is excited to rotate, the spring body generates elastic deformation, so that the mounting part resists the rotation of the second connecting part, and the resonance of the transmission assembly is realized.

According to the transmission assembly provided by the embodiment of the utility model, the mass block and the flexible spring are arranged, so that the processing and manufacturing cost of the transmission assembly is reduced, and the manufacturing process of the transmission assembly is simplified.

In some embodiments, the third connecting portion is a groove, and the protrusion of the second connecting portion is inserted into the groove and fixedly connects the flexible spring and the mass block.

In some embodiments, the mass is provided with a second hole extending through the mass in the axial direction, the second hole being adapted for fixed mounting with a support shaft; and when the support shaft rotates, the mass block is driven to rotate, or the mass block rotates to drive the support shaft to rotate.

In some embodiments, the flexible springs include a first flexible spring and a second flexible spring, the first flexible spring and the second flexible spring are disposed opposite to each other along the axis direction at intervals, the second connection portion of the first flexible spring and the second connection portion of the first flexible spring are disposed at an included angle on a plane perpendicular to the axis, the mass block is disposed between the first flexible spring and the second flexible spring, and the second connection portion of the first flexible spring and the second connection portion of the second flexible spring are both matched with the third connection portion of the mass block to fixedly connect the first flexible spring, the second flexible spring and the mass block, so as to form a transmission assembly.

Drawings

Fig. 1 is a schematic structural view of a flexible spring according to a first embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a mass according to an embodiment of the present utility model.

Fig. 3 is a schematic structural view of a transmission assembly according to an embodiment of the present utility model.

Fig. 4 is a perspective view of an electric toothbrush in accordance with an embodiment of the present utility model.

Fig. 5 is a schematic view of the structure of an electric toothbrush according to an embodiment of the present utility model.

Fig. 6 is an exploded view of an electric toothbrush according to an embodiment of the present utility model.

Fig. 7 is a schematic structural view of a flexible spring according to a second embodiment of the present utility model.

Fig. 8 is a schematic structural view of a flexible spring according to a third embodiment of the present utility model.

Reference numerals:

a flexible spring 100; an electric toothbrush 10;

a spring body 1;

a mounting part 2; a first hole 21; an arcuate segment 211; a straight section 212; a first connection part 3; an extension line 31; a first section 32; a second connection portion 4; a first section 41; a second section 42;

a mass 5; a third connection portion 51; a second hole 52; a third hole 53; a first flexible spring 6; a second flexible spring 7; a toothbrush assembly 8; a support 9; a shaft 11; a transmission assembly 12; a first transmission assembly 121; a second transmission assembly 122; a motor 13; a housing 14; an axis 15; a support shaft 16.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

An electric toothbrush according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

As shown in fig. 1-8, an electric toothbrush 10 according to an embodiment of the present utility model includes a housing 14, a support frame 9, a shaft 11, a transmission assembly 12, a motor 13, and a toothbrush assembly 8.

The support frame 9 is supported in the housing 14, and the shaft 11 is rotatably provided through the support frame 9. Specifically, as shown in fig. 4, the support frame 9 is fixed in the housing 14, the support frame 9 is provided with a third hole 53 (not shown) penetrating the support frame 9 in the left-right direction, and the aperture of the third hole 53 is larger than the outer diameter of the shaft 11, so that the shaft 11 is rotatably penetrated in the third hole 53.

The transmission assembly 12 includes a first transmission assembly 121 and a second transmission assembly 122, the first transmission assembly 121 is disposed on the shaft 11 in a penetrating manner so that the first transmission assembly 121 drives the shaft 11 to rotate, the second transmission assembly 122 is disposed on the shaft 11 in a penetrating manner so that the shaft 11 drives the second transmission assembly 122 to rotate, the supporting frame 9 is disposed between the first transmission assembly 121 and the second transmission assembly 122 so that the first transmission assembly 121 and the second transmission assembly 122 resonate, an outer circumferential surface of the first transmission assembly 121 and an inner circumferential surface of the housing 14 are disposed at intervals along a radial direction (an inner-outer direction as shown in fig. 1) of the axis 15, and an outer circumferential surface of the second transmission assembly 122 and an inner circumferential surface of the housing 14 are disposed at intervals along the radial direction of the axis 15. Specifically, as shown in fig. 5, the first transmission assembly 121 and the second transmission assembly 122 are both disposed on the shaft 11 in a penetrating manner, the first transmission assembly 121 is located at the left side of the supporting frame 9, and the second transmission assembly 122 is located at the right side of the supporting frame 9, so that the first transmission assembly 121 and the second transmission assembly 122 are suspended in the housing 14 through the supporting frame 9.

The motor 13 is disposed in the housing 14, and the motor 13 is connected to the second transmission assembly 122, so that the motor 13 drives the second transmission assembly 122 to rotate to drive the shaft 11 to drive the first transmission assembly 121. Specifically, as shown in fig. 4, the motor 11 is disposed on the right side of the second transmission assembly 122 and connected to the second transmission assembly 122, so that the shaft 11 is driven to rotate by the second transmission assembly 122, and the shaft 11 drives the second transmission assembly 122.

The toothbrush assembly 8 is coupled to the second drive assembly 122 such that the second drive assembly 122 vibrates the toothbrush assembly 8. Specifically, as shown in fig. 4, the toothbrush assembly 8 is provided at the left side of the second transmission assembly 122 and is connected to the second transmission assembly 122, thereby causing the driving assembly 12 to generate high frequency vibration to be transmitted to the toothbrush assembly 8 so that the toothbrush assembly 8 cleans the teeth of the person.

By adjusting the frequency of the motor 2 such that the first and second transmission assemblies 121 and 122 may resonate, the first and second transmission assemblies 121 and 122 rotate in opposite directions, in other words, the first transmission assembly 121 rotates clockwise, the second transmission assembly 122 rotates counterclockwise, or the first transmission assembly 121 rotates counterclockwise, the second transmission assembly 122 rotates clockwise, such that such an opposite rotation reduces the transmission of torsional vibrations that may be transmitted to the user during operation.

The first transmission assembly 121 and the second transmission assembly 122 each comprise a mass 5 and a flexible spring 100.

The mass 5 is provided with a third connection 51, and the mass 5 is used for adjusting the resonance frequency of the transmission assembly 12. Specifically, as shown in fig. 2, 3 and 5, the mass 5 may be a rectangular block, a circular block, an oval block, a polygonal block, or the like, and a third connection portion 51 that is matched with the flexible spring 100 is provided on a side of the mass 5 facing the flexible spring 100, so that the flexible spring 100 may be connected to the mass 5 through the third connection portion 51, and in addition, the resonance frequency of the transmission assembly 12 is adjusted through the weight, size, and structure of the mass 5.

The flexible spring 100 comprises an axis 15, a spring body constituted by a first connection 3 having a first stiffness and an annular body 1 having a second stiffness, a mounting 2 and a second connection 4 arranged in a chamber.

The annular body 1 forms a closed-loop chamber circumferentially around an axis 15, the axis 15 passing through the centre point of the chamber. Specifically, as shown in fig. 1, the axis 15 extends in the left-right direction, the annular body 1 is a flexible material, and the annular body 1 may be any of a circular ring shape, a polygonal shape, an elliptical shape, or the like, the annular body 1 has an outer peripheral surface and an inner peripheral surface in the radial direction of the axis 15, and the center line of the chamber of the annular body 1 coincides with the axis 15.

The first connecting portion 3 has a first end operatively engaged with the inner peripheral surface of the annular body 1, and a second end operatively engaged with the outer peripheral surface of the mounting portion 2, the first connecting portion 3 extending in the radial direction of the axis 15. Specifically, as shown in fig. 1, the first connecting portion 3 is provided between the mounting portion 2 and the annular body 1, the first connecting portion 3 is in a long strip shape as viewed from the direction of the axis 15, one end of the first connecting portion 3 is connected with the inner peripheral surface of the annular body 1, the other end of the first connecting portion 3 is connected with the outer peripheral surface of the mounting portion 2, thereby the mounting portion 2 and the annular body 1 are connected by the first connecting portion 3, the first connecting portion 3 is made of a flexible material, and the mounting portion 2 rotates relative to the annular body 1 by the first connecting portion 3.

The mounting portion 2 is provided with a first hole 21 extending through the mounting portion 2 along the axis 15. Specifically, as shown in fig. 1, the mounting portion 2 includes, but is not limited to, a rectangular block, a cylindrical block, an elliptic cylindrical block, a polygonal block, etc., the mounting portion 2 is provided in the chamber, and the outer peripheral surface of the mounting portion 2 and the inner peripheral surface of the annular body 1 are disposed at radial intervals along the axis 15, a first hole 21 penetrating the mounting portion 2 in the left-right direction is provided in the mounting portion 2, and the shaft 11 of the electric toothbrush 10 may penetrate the first hole 21 so as to rotate the mounting portion 2, preferably, the axis of the first hole 21 coincides with the axis 15.

The second connecting portion 41 includes a first segment 41 integrally interposed with the annular body 1, and a second segment 42 protruding from an end surface of the annular body 1, the protruding direction extending along the axis 15. Specifically, as shown in fig. 1, a second connecting portion 4 extending in the left-right direction is provided on one side of the ring-shaped body 1 facing the mass 5, a first section 41 of the second connecting portion 4 is provided on the ring-shaped body 1, a second section 42 of the second connecting portion 4 is provided at one end of the first section 41 and is inserted into the mass 5, and the second section 42 is a cylinder, such as a cylinder or a polygonal cylinder, so as to be connected with the mass 5 of the electric toothbrush through the second connecting portion 4.

When the mounting part 2 of the flexible spring 100 is excited to rotate, the annular body 1 generates elastic deformation, so that the second connecting part 4 resists the rotation of the mounting part 2, and the resonance of the transmission assembly 12 is realized; or when the mass block 5 is excited to rotate, the annular body 1 generates elastic deformation, so that the mounting part 2 resists the rotation of the second connecting part 4, and the resonance of the transmission assembly 12 is realized. Specifically, as shown in fig. 1-2, the motor 11 drives the mass block 5 of the second transmission assembly 122 to rotate so as to drive the annular body 1 of the flexible spring 100 of the second transmission assembly 122 to rotate, the annular body 1 of the flexible spring 100 of the second transmission assembly 122 drives the mounting part 2 of the flexible spring 100 of the second transmission assembly 122 to rotate, the mounting part 2 of the flexible spring 100 of the second transmission assembly 122 drives the shaft 11 to rotate, the shaft 11 drives the mounting part 2 of the flexible spring 100 of the first transmission assembly 121 to drive the annular body 1 of the flexible spring 100 of the first transmission assembly 121 to rotate, and the mass block 5 of the first transmission assembly 121 is driven to rotate, so that the flexible spring 100 of the second transmission assembly 122 and the flexible spring 100 of the first transmission assembly 121 resonate, finally, the toothbrush assembly 8 is driven to resonate through the mass block 5 of the first transmission assembly 121, and in a resonance state, the rotation amplitude of the mounting part 2 is smaller than that of the annular body.

It should be noted that: the first connecting portion 3 is a main spring, the annular body 1 is an auxiliary spring, the first connecting portion 3 and the annular body 1 jointly form a spring body, when the mounting portion 2 rotates along the axial line 15 in the circumferential direction R1, the annular body 1 deforms, the second rigidity of the first connecting portion 3 and the first rigidity of the annular body enable the second connecting portion 4 to resist rotation of the mounting portion 2 along the R1 direction, or when the second connecting portion 4 rotates along the axial line 15 in the circumferential direction R2 direction, the annular body 1 deforms, and the second rigidity of the first connecting portion 3 and the first rigidity of the annular body 1 enable the mounting portion 2 to resist rotation of the second connecting portion 4 along the R2 direction. Wherein the R1 direction and the R2 direction may be the same or opposite.

The flexible spring 100 of the embodiment of the utility model is provided with the annular body 1, the mounting part 2, the first connecting part 3 and the second connecting part 4, and compared with the rotating member and the compliant member which are arranged in the related art, the processing technology of the flexible spring 100 is simplified, and the processing and manufacturing cost of the flexible spring 100 is reduced.

The transmission assembly provided by the embodiment of the utility model has the advantages of simple structure, stable force transmission, simple process, low cost and the like due to the fact that the mass block 5 and the flexible spring 100 are arranged.

In some embodiments, the flexible spring 100 may be injection molded in one piece using plastic resin. Thereby further reducing the manufacturing costs of the flexible spring 100.

In some embodiments, the first connecting portion 3 gradually expands in orientation having a component perpendicular to the extension line of the first connecting portion 3 from the inner peripheral surface of the annular body 1 to the outer peripheral surface of the mounting portion 2, as seen in a cross section of the extension line 31 of the first connecting portion 3. Specifically, as shown in fig. 1, the cross section of the extension line 31 of the first connecting portion 3 is the first cross section 32 shown in fig. 1, in which the cross section area of the first connecting portion 3 gradually decreases from the outside to the inside along the radial direction of the axis 15, in other words, the cross section area of the first connecting portion 3 connected to the mounting portion 2 is larger than the cross section area of the first connecting portion 3 connected to the annular body 1, because the mounting portion 2 drives the annular body 1 to rotate through the first connecting portion 3, the cross section area of the first connecting portion 3 connected to the mounting portion 2 is larger, the stability of the flexible spring 100 is improved, the cross section area of the first connecting portion 3 connected to the annular body 1 is smaller, the elastic deformation amount of the first connecting portion 3 is improved, so that the annular body 1 is driven to rotate around the circumferential direction of the axis 15 through the first connecting portion 3, in addition, the cross section area of the first connecting portion 3 gradually increases along the direction adjacent to the mounting portion 2, stress concentration caused by deformation of the first connecting portion 3 can also be eliminated, and the fatigue life of the first connecting portion 3 is improved.

In some embodiments, the projection of the annular body 1 is circular, elliptical or polygonal, as seen in the direction of the axis 15 (left-right direction as viewed in fig. 5). Specifically, as shown in fig. 1, 7 and 8, the outer circumferential profile of the annular body 1 may be circular, elliptical or polygonal, whereby the annular body 1 may be provided according to actual conditions, increasing the variety of the annular body 1.

In some embodiments, the first connecting portions 3 are plural, and the plural first connecting portions 3 are disposed at intervals along the circumferential direction of the axis 15. Specifically, as shown in fig. 1, the number of the first connection portions 3 may be two or more, for example, two first connection portions 3 (two are shown in fig. 1), and the two first connection portions 3 are disposed at equal intervals along the circumferential direction of the axis 15, so that the flexible spring 100 is disposed more reasonably, and the stability of the flexible spring 100 is improved.

In some embodiments, the second connecting portions 4 are a plurality of, and the plurality of second connecting portions 4 are disposed at intervals along the circumference of the axis 15. Specifically, as shown in fig. 1, the number of the second connection portions 4 may be two or more, two second connection portions 4 in the embodiment of the present utility model are two examples (two shown in fig. 1), and the two second connection portions 4 are disposed at equal intervals along the circumferential direction of the axis 15, so as to improve the stability of the rotation of the mass block 5.

In some embodiments, the connection position between the first end of the first connection portion 3 and the inner peripheral surface of the annular body 1 is a connection position, and the connection position and the first section 41 of the second connection portion 4 are disposed at intervals in the circumferential direction of the axis. Specifically, as shown in fig. 1, the connection point of the other end of the first connecting portion 3 with the annular body 1 is offset from the second connecting portion 4 in the circumferential direction of the axis 15. Thereby, the rotating force on the mounting part 2 is transmitted to the annular body 1 through the first connecting part 3 and then transmitted to the second connecting part 4 through the annular body 1, so that the rotating displacement of the second connecting part 4 is improved through the deformation of the second connecting part 4, and the rotating displacement of the mass block 5 is further improved.

Preferably, the connection points of the other ends of the first connection portions 3 with the annular body 1 and the second connection portions 4 are alternately arranged at intervals on the annular body 1, and the other ends of the first connection portions 3 are equally spaced from the connection points of the annular body 1 and the second connection portions 4 in the circumferential direction of the axis 15. In other words, the plurality of first connecting portions 3 are arranged at equal intervals along the circumferential direction of the axis 15 and the plurality of second connecting portions 4 are arranged at equal intervals along the circumferential direction of the axis 15, and the first connecting portions 3 are arranged between two adjacent first connecting portions 3, so that the flexible spring 100 is arranged more reasonably, the transmission performance of the flexible spring 100 is ensured, and the stability of the rotation of the mass block 5 is improved.

Preferably, the projection of the first hole 21 includes a straight section 212 and an arc section 211, as viewed from the direction of the axis 11, one end of the straight section 212 is connected to one end of the arc section 211, the other end of the straight section 212 is connected to the other end of the arc section 211, and the arc length of the arc section 211 is greater than one half of the same circle, or the projection of the first hole 21 is circular. Specifically, as shown in fig. 1, one end of the straight section 212 is connected with one end of the arc section 211, the other end of the straight section 212 is connected with the other end of the arc section 211, so that a semicircular hole is formed on a projection surface orthogonal to the left-right direction by the first hole 21, a matching portion which is matched with the first hole 21 and has a semicircular cross section is arranged on the shaft 11, the matching portion of the shaft 11 is arranged in the first hole 21 in a penetrating manner, so that the shaft 11 drives the mounting portion 2 to rotate, in addition, the arc length of the arc section 211 is greater than one half of the same circle, the cross section of the matching portion of the shaft 11 can not be too small, the rigidity of the shaft 11 is guaranteed, the service life of the shaft 11 is prolonged, or the first hole 21 is a circular hole, the first hole 21 is in interference fit with the shaft 11, and the shaft 11 can rotate synchronously with the flexible spring 100.

It is to be understood that the first hole 21 may be a special-shaped hole, the opposite hole includes but is not limited to an oval shape, a polygonal shape, etc., and the outer circumferential surface of the shaft 11 is provided with a special-shaped surface matching with the opposite hole, so that the shaft 11 is matched with the first hole 21, so that the shaft 11 drives the mounting portion 2 to rotate, and in addition, the first hole 21 and the shaft 11 may also be matched by interference fit or by a fastener, etc., which is not specifically described in the present utility model.

In some embodiments, the peripheral contour of the second section 42 of the second connection 4 is located within the peripheral contour of the first section 41, or the peripheral contour of the second section 42 of the second connection 4 coincides with the peripheral contour of the first section 41, seen in the direction of the axis 15. Specifically, as shown in fig. 3, the cross-sectional area of the second section 42 is smaller than that of the first section 41, and the end face of the first section 41 can be abutted against the end face of the mass block 5, so that the third connecting portion 51 and the second connecting portion 4 are positioned, the assembly process of the mass block 5 and the flexible spring 100 is simplified, the cross-sectional areas between the first section 41 and the second section 42 are equal, and the processing and manufacturing cost of the flexible spring 100 is reduced.

The third connecting portion 51 is a groove, and the protrusion of the second connecting portion 4 is inserted into the groove, and fixedly connected with the flexible spring and the mass block 5. Specifically, as shown in fig. 3, the third connection portion 51 is a groove, and the flexible spring 100 and the mass 5 are mounted together by penetrating the protrusion into the groove.

It will be appreciated that the flexible spring 100 and the mass 5 may be integrally formed.

Preferably, the length of the second section 42 along the left-right direction is not greater than the depth of the groove, and the second section 42 and the groove can be connected by interference fit, adhesion, clamping or the like.

In some embodiments, the mass 5 is provided with a second hole 52 extending through the mass 5 along the axis 15 of the flexible spring 100, the second hole 52 being adapted to be fixedly mounted to the support shaft 16, such that rotation of the support shaft 1611 causes rotation of the mass 5, or rotation of the mass 5 causes rotation of the support shaft 1611. Specifically, as shown in fig. 2 and 6, the support shaft 16 may be disposed at the left end of the rotor of the motor 13, and the support shaft 16 passing through the rotor of the motor 13 is disposed in the second hole 52 of the mass block 5 of the second transmission assembly 122, so that the rotor of the motor 13 drives the mass block 5 of the second transmission assembly 122 to rotate through the support shaft 16, and the support shaft 16 may also be disposed at the right end of the toothbrush assembly 8, and the support shaft 16 passing through the toothbrush assembly 8 and the second hole 52 of the mass block 5 of the first transmission assembly 121, so that the mass block 5 of the first transmission assembly 121 drives the toothbrush assembly 8 to vibrate, thereby simplifying the assembly cost of the electric toothbrush through the arrangement of the support shaft 16 and the second hole 52.

In some embodiments, the flexible spring 100 includes a first flexible spring 6 and a second flexible spring 7, where the first flexible spring 6 and the second flexible spring 7 are disposed opposite to each other along the direction of the axis 15, the second connection portion 4 of the first flexible spring 6 and the second connection portion 4 of the first flexible spring 6 are disposed at an included angle on a plane perpendicular to the axis 15, the mass block 5 is disposed between the first flexible spring 6 and the second flexible spring 7, and the second connection portion 4 of the first flexible spring 6 and the second connection portion 4 of the second flexible spring 7 are both mated with the third connection portion 51 of the mass block 5 to fixedly connect the first flexible spring 6, the second flexible spring 7 and the mass block 5, so as to form the transmission assembly 12. Specifically, as shown in fig. 3, the number of the flexible springs 100 may be two (two as shown in fig. 3), the two flexible springs 100 are a first flexible spring 6 and a second flexible spring 7, the first flexible spring 6 is disposed on the left side of the mass block 5, the second flexible spring 7 is disposed on the right side of the mass block 5, two second connecting portions 4 are disposed on the first flexible spring 6 and the second flexible spring 7, four third connecting portions 51 are disposed on the mass block 5 at equal intervals along the circumferential direction of the axis 15, wherein the two opposite third connecting portions 51 are connected with the second connecting portions 4 of the first flexible spring 6, the other two opposite third connecting portions 51 are connected with the second connecting portions 4 of the second flexible spring 7, in other words, a straight line between the two second connecting portions 4 of the first flexible spring 6 is a first straight line, a straight line between the two second connecting portions 4 of the second flexible spring 7 is a second straight line, and the first straight line and the third straight line are viewed from the direction of the axis 15, so that the intersecting force-receiving and rotating stability of the mass block 5 is ensured. Preferably, the first straight line and the third straight line intersect at an included angle of 90 DEG

It should be noted that the number of the flexible springs 100 and the number of the masses 5 of the transmission assemblies 12 may be selected to be plural according to the choice, and the masses 5 are disposed between two adjacent transmission assemblies 12.

In some embodiments, as shown in fig. 5, the mass 5 is provided with a third hole 53 penetrating the mass in the axial direction of the annular body 1, the third hole 53 of the mass 5 of the first transmission assembly 121 is connected to the toothbrush assembly 8, and the third hole 53 of the mass 5 of the second transmission assembly 122 is connected to the motor 13. Thus, the motor 13 drives the mass block 5 of the second transmission assembly 122 to rotate, the mass block 5 of the second transmission assembly 122 drives the first flexible spring 6 of the second transmission assembly 122 and the second flexible spring 7 of the second transmission assembly 122, the first flexible spring 6 of the second transmission assembly 122 and the second flexible spring 7 of the second transmission assembly 122 drive the shaft 11 to rotate, the shaft 11 drives the mass block 5 of the first transmission assembly 121 to rotate, the mass block 5 of the first transmission assembly 121 drives the first flexible spring 6 of the first transmission assembly 121 and the second flexible spring 7 of the first transmission assembly 121 to rotate, and the first flexible spring 6 of the first transmission assembly 121 and the second flexible spring 7 of the first transmission assembly 121 drive the toothbrush assembly 8 to clean the teeth of a user.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., 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 present disclosure. In this specification, schematic representations of the above terms are not necessarily directed 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. Furthermore, the various embodiments or examples described in this specification and the features of the various embodiments or examples may be combined and combined by those skilled in the art without conflict.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims (11)

1. A flexible spring, comprising: an axis; a spring body formed of a first connection portion having a first stiffness and an annular body having a second stiffness, wherein the annular body surrounds a closed-loop chamber along a circumference of the axis, the axis passing through a center point of the chamber; the mounting part is arranged in the cavity and is provided with a first hole penetrating through the mounting part along the axis direction; the first connecting portion having a first end operatively engaged with an inner peripheral surface of the annular body and a second end operatively engaged with an outer peripheral surface of the mounting portion, the first connecting portion extending in a radial direction of the axis; the second connecting part comprises a first section integrally penetrating with the annular body and a second section protruding from the end face of the annular body, and the protruding direction of the second section extends along the axis; when the mounting part circumferentially rotates along the axis, the spring body elastically deforms, so that the second connecting part resists the rotation of the mounting part; when the second connecting part circumferentially rotates along the axis, the spring body elastically deforms, so that the mounting part resists the rotation of the second connecting part.

2. A flexible spring according to claim 1, wherein the first connecting portion has an orientation gradually expanding in a perpendicular component to the extension line of the first connecting portion from an inner peripheral surface of the annular body to an outer peripheral surface of the mounting portion, as viewed in a cross section where the extension line of the first connecting portion is located.

3. The flexible spring of claim 1, wherein the first connecting portions are a plurality of and the first connecting portions are disposed at intervals along the circumference of the axis, and/or the second connecting portions are a plurality of and the second connecting portions are disposed at intervals along the circumference of the axis.

4. The flexible spring of claim 1, wherein a connection location of the first end of the first connection portion and the inner circumferential surface of the annular body is a connection location, and the connection location and the first section of the second connection portion are disposed at a circumferential interval of the axis.

5. The flexible spring of claim 4, wherein the peripheral profile of the first aperture comprises a straight section and an arcuate section, one end of the straight section being connected to one end of the arcuate section, the other end of the straight section being connected to the other end of the arcuate section, the arcuate section having a circular arc length greater than one-half of a circle in which the arcuate section is located; or alternatively, the first and second heat exchangers may be,

the peripheral outline of the first hole is circular.

6. A flexible spring according to any one of claims 1-5, wherein the outline of the outer circumferential surface of the annular body is circular, elliptical or polygonal.

7. The flexible spring of claim 1, wherein the outer peripheral contour of the second segment of the second connecting portion is located within the outer peripheral contour of the first segment, or the outer peripheral contour of the second segment of the second connecting portion coincides with the outer peripheral contour of the first segment, as seen in the axial direction.

8. A transmission assembly, comprising:

the mass block is provided with a third connecting part and is used for adjusting the resonance frequency of the transmission assembly;

a flexible spring according to any one of claims 1 to 7, wherein the second connecting portion of the flexible spring is engaged with the third connecting portion so that the mass is connected to the flexible spring;

when the mounting part of the flexible spring is excited to rotate, the spring body generates elastic deformation, so that the second connecting part resists the rotation of the mounting part to realize the resonance of the transmission assembly; or when the mass block is excited to rotate, the spring body generates elastic deformation, so that the mounting part resists the rotation of the second connecting part, and the resonance of the transmission assembly is realized.

9. The transmission assembly of claim 8, wherein the third connecting portion is a groove, and the protrusion of the second connecting portion is disposed in the groove in a penetrating manner, and fixedly connects the flexible spring and the mass.

10. The transmission assembly of claim 8, wherein the mass is provided with a second aperture extending through the mass of the flexible spring in the direction of the axis of the flexible spring, the second aperture being adapted for fixed mounting with a carrier shaft;

and when the support shaft rotates, the mass block is driven to rotate, or the mass block rotates to drive the support shaft to rotate.

11. The transmission assembly of claim 8, wherein the flexible springs comprise a first flexible spring and a second flexible spring, the first flexible spring and the second flexible spring being disposed in spaced opposition along the axis, the second connection portion of the first flexible spring and the second connection portion of the first flexible spring being disposed at an included angle in a plane perpendicular to the axis,

the mass block is arranged between the first flexible spring and the second flexible spring, and the second connecting part of the first flexible spring and the second connecting part of the second flexible spring are matched with the third connecting part of the mass block so as to fixedly connect the first flexible spring, the second flexible spring and the mass block to form a transmission assembly.

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