Transmission mechanism and electric toothbrush

Abstract

The utility model discloses a transmission mechanism and an electric toothbrush, and relates to the technical field of electric toothbrushes, the transmission mechanism comprises a machine core, the machine core comprises a driving piece, an eccentric shaft and a driving shaft; one end of the driving shaft is in transmission connection with the eccentric shaft, the other end of the driving shaft is provided with a connecting section, the driving piece is in driving connection with a transmission shaft, the transmission shaft is provided with a first shaft hole allowing the connecting section to be inserted, and a transmission part is arranged on the peripheral surface of the connecting section; a matching part in transmission fit with the transmission part is arranged on the inner wall surface of the first shaft hole; the eccentric shaft is in transmission connection with the brush disc; the technical scheme provided by the utility model has the technical effects that the connecting section is inserted into the first shaft hole, so that the driving piece is in transmission connection with the driving shaft, the transmission part is propped against the matching part, the power generated by the driving piece is transmitted to the driving shaft through the matching part and the transmission part, and the driving piece stably drives the driving shaft to rotate.

Description

Technical Field

[0001] The utility model relates to the technical field of electric toothbrushes, in particular to a transmission mechanism and an electric toothbrush. Background Art

[0002] As people pay more and more attention to the health of their teeth, electric toothbrushes are popular because they are convenient for cleaning teeth and improving oral health. The electric toothbrush drives the drive shaft to rotate through the drive member, thereby driving the eccentric shaft to rotate to generate eccentric force, so that the eccentric shaft drives the brush plate to rotate, thereby driving the bristles to reciprocate and clean the teeth.

[0003] In the existing electric toothbrush, a part of the eccentric force generated by the eccentric shaft when rotating is easily transmitted to the driving shaft, making the transmission unstable when the driving member drives the driving shaft to rotate, and the driving shaft is easily damaged and detached from the driving member, thereby affecting the use of the electric toothbrush. Utility Model Content

[0004] The main purpose of the utility model is to provide a transmission mechanism and an electric toothbrush, aiming to improve the stability of the transmission of the driving shaft driven by the driving member.

[0005] To achieve the above-mentioned purpose, the transmission mechanism proposed in the utility model includes a movement, the movement includes a driving member, an eccentric shaft and a driving shaft, the driving member is used to be arranged in the body, the driving shaft and the eccentric shaft are used to be arranged in the brush handle;

[0006] One end of the driving shaft is drivingly connected to the eccentric shaft, the other end of the driving shaft is provided with a connecting section, the driving member is drivingly connected to a transmission shaft, the transmission shaft is provided with a first shaft hole for the connecting section to be inserted, the outer peripheral surface of the connecting section is provided with a transmission part, the inner wall surface of the first shaft hole is provided with a matching part for transmission with the transmission part; the eccentric shaft is drivingly connected to the brush disc;

[0007] The driving member is used to drive the driving shaft to rotate via the transmission shaft, so that the driving shaft drives the eccentric shaft to rotate, and further drives the brush plate to rotate relative to the brush handle.

[0008] In one embodiment, the driving member has an output shaft, and a second shaft hole is provided at one end of the transmission shaft away from the first shaft hole, the output shaft is inserted into the second shaft hole, and the output shaft is in transmission connection with the transmission shaft.

[0009] In one embodiment, the outer circumferential surface of the connecting section is provided with a plurality of the transmission parts along the circumferential direction, the inner circumferential surface of the first axial hole is provided with a plurality of the matching parts along the circumferential direction, and the transmission parts and the matching parts are plugged in one-to-one to form a transmission fit.

[0010] In one embodiment, a plurality of protrusions are convexly provided on the inner wall surface of the first axial hole, and the plurality of protrusions are arranged along the circumference of the first axial hole. A first groove is formed between any two adjacent protrusions, and the first groove forms the matching portion. The transmission portion is inserted into the first groove one by one, and two sides of the transmission portion are respectively abutted against the groove wall of the first groove.

[0011] In one embodiment, the transmission portion is in the shape of an elongated strip extending along the axial direction of the connecting section.

[0012] In one embodiment, the transmission part includes a first transmission section and a transmission head connected to each other, the transmission head is located at one end of the first transmission section close to the transmission shaft, and the width of the transmission head gradually decreases from the first transmission section toward the transmission head.

[0013] In one embodiment, the driving shaft includes a first shaft body and a limiting portion provided at one end of the first shaft body, the connecting section is provided on a side of the limiting portion away from the first shaft body, and when the connecting section is inserted into the first shaft hole, the limiting portion is in limiting contact with the end face of the transmission shaft.

[0014] In one embodiment, the eccentric shaft includes a second shaft body and a second transmission section arranged at one end of the second shaft body, and a connecting hole is provided at one end of the drive shaft away from the connecting section, and the second transmission section is inserted into the connecting hole to enable the eccentric shaft to be connected to the drive shaft in transmission.

[0015] In one embodiment, the eccentric shaft further includes an eccentric section disposed at one end of the second shaft body away from the second transmission section, the brush disc is provided with a second groove, and the eccentric section is inserted into the second groove to enable the eccentric shaft to be transmission-connected to the brush disc.

[0016] The utility model also provides an electric toothbrush, comprising the transmission mechanism as described in any of the above embodiments.

[0017] The technical solution of the utility model is to provide a connecting section at one end of the driving shaft away from the eccentric shaft, the driving member is connected to the transmission shaft, the transmission shaft is provided with a first shaft hole for the connecting section to be inserted, the outer peripheral surface of the connecting section is provided with a transmission part, the inner wall surface of the first shaft hole is provided with a matching part, the connecting section is inserted into the first shaft hole, so that when the driving member is connected to the driving shaft for transmission, the transmission part abuts against the matching part, so that the power generated by the driving member is transmitted to the driving shaft through the matching part and the transmission part, so that the driving member can stably drive the driving shaft to rotate, thereby improving the stability of the transmission between the driving member and the driving shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 A structural cross-sectional view of an embodiment of a transmission mechanism and an electric toothbrush provided by the utility model;

[0020] Figure 2 An exploded view of the structure of a transmission mechanism and an electric toothbrush according to an embodiment of the present invention;

[0021] Figure 3 A structural cross-sectional view showing the connection between the transmission part, the protruding part and the matching part in one embodiment of the transmission mechanism provided by the utility model;

[0022] Figure 4 This is a schematic structural diagram of an embodiment of a drive shaft in a transmission mechanism provided by the utility model;

[0023] Figure 5 The present invention is a schematic structural diagram of an embodiment of a transmission shaft in a transmission mechanism provided by the present invention.

[0024] Description of Figure Numbers:

[0025] 1. Brush plate; 11. Brush handle; 12. Body; 13. Second groove; 2. Movement; 21. Driving member; 211. Transmission shaft; 2111. First shaft hole; 2112. Matching portion; 2113. Second shaft hole; 2114. Protrusion; 2115. Output shaft; 22. Eccentric shaft; 221. Second shaft body; 222. Second transmission section; 223. Eccentric section; 23. Driving shaft; 231. Connecting section; 2311. Transmission part; 2312. First transmission section; 2313. Transmission head; 232. First shaft body; 233. Limiting part; 234. Connecting hole.

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0030] As people pay more and more attention to the health of their teeth, electric toothbrushes are popular because they are convenient for cleaning teeth and improving oral health. The electric toothbrush drives the driving shaft 23 to rotate through the driving member 21, thereby driving the eccentric shaft 22 to rotate to generate an eccentric force, so that the eccentric shaft 22 drives the brush plate 1 to rotate, thereby driving the bristles to reciprocate and clean the teeth.

[0031] However, in the process of conceiving and implementing this application, the inventor found that there are at least the following problems:

[0032] In the existing electric toothbrush, part of the eccentric force generated by the eccentric shaft 22 during rotation is easily transmitted to the drive shaft 23, making the transmission unstable when the drive member 21 drives the drive shaft 23 to rotate. The drive shaft 23 is easily damaged and detached from the drive member 21, thereby affecting the use of the electric toothbrush.

[0033] The utility model provides a transmission mechanism.

[0034] See also Figure 1 and Figure 2 In one embodiment of the utility model, the transmission mechanism is applied to an electric toothbrush, the electric toothbrush comprises a brush plate 1, a brush handle 11 and a body 12 connected to each other, and the transmission mechanism comprises:

[0035] The movement 2 includes a driving member 21, an eccentric shaft 22 and a driving shaft 23, wherein the driving member 21 is arranged in the body 12, and the driving shaft 23 and the eccentric shaft 22 are arranged in the brush handle 11;

[0036] One end of the driving shaft 23 is connected to the eccentric shaft 22 in driving mode, and the other end of the driving shaft 23 is provided with a connecting section 231. The driving member 21 is connected to the driving shaft 211 in driving mode. The driving shaft 211 is provided with a first shaft hole 2111 for the connecting section 231 to be inserted. The outer peripheral surface of the connecting section 231 is provided with a transmission part 2311, and the inner wall surface of the first shaft hole 2111 is provided with a matching part 2112 that is matched with the transmission part 2311 in driving mode. The eccentric shaft 22 is connected to the brush plate 1 in driving mode.

[0037] The driving member 21 is used to drive the driving shaft 23 to rotate via the transmission shaft 211, so that the driving shaft 23 drives the eccentric shaft 22 to rotate, thereby driving the brush plate 1 to rotate relative to the brush handle 11;

[0038] The technical solution of the utility model is to provide a connecting section 231 at one end of the driving shaft 23 away from the eccentric shaft 22, and the driving member 21 is drivingly connected to the transmission shaft 211. The transmission shaft 211 is provided with a first shaft hole 2111 for the connecting section 231 to be inserted, and the outer peripheral surface of the connecting section 231 is provided with a transmission part 2311, and the inner wall surface of the first shaft hole 2111 is provided with a matching part 2112. The connecting section 231 is inserted into the first shaft hole 2111, so that when the driving member 21 is connected to the driving shaft 23 for transmission, the transmission part 2311 abuts against the matching part 2112, so that the power generated by the driving member 21 is transmitted to the driving shaft 23 through the matching part 2112 and the transmission part 2311, so that the driving member 21 can stably drive the driving shaft 23 to rotate, thereby improving the stability of the transmission between the driving member 21 and the driving shaft 23.

[0039] In this embodiment, the movement 2 is used to drive the brush plate 1 to rotate relative to the brush handle 11. The movement 2 includes a driving member 21, an eccentric shaft 22 and a driving shaft 23. The driving member 21 is used to be arranged in the body 12, and the driving shaft 23 and the eccentric shaft 22 are used to be arranged in the brush handle 11. The movement 2 also includes a fixed sleeve, which is arranged in the brush handle 11. The fixed sleeve is connected to the eccentric shaft 22 in a transmission manner so that the eccentric shaft 22 can rotate relative to the fixed sleeve. The fixed sleeve is used to improve the stability of the eccentric shaft 22 when rotating, thereby preventing the eccentric shaft 22 from detaching from the driving shaft 23 when rotating. One end of the driving shaft 23 is connected to the eccentric shaft 22 in a transmission manner so that the eccentric shaft 22 can be driven to rotate when the driving shaft 23 rotates. The end of the driving shaft 23 away from the eccentric shaft 22 is provided with a connecting section 231, and the end of the driving member 21 close to the driving shaft 23 is drivingly connected to the transmission shaft 211. The connecting section 231 is transmission-connected with the transmission shaft 211, so that the driving member 21 can drive the driving shaft 23 to rotate through the transmission cooperation between the transmission shaft 211 and the connecting section 231. One end of the transmission shaft 211 that is transmission-connected with the connecting section 231 is provided with a first shaft hole 2111 for the connecting section 231 to be inserted, the outer peripheral surface of the connecting section 231 is provided with a transmission part 2311, and the inner wall surface of the first shaft hole 2111 is provided with a matching part 2112 that is transmission-matched with the transmission part 2311. When the connecting section 231 is inserted into the first shaft hole 2111, the transmission part 2311 abuts against the matching part 2112. The transmission shaft 211 and the connecting section 231 are matched with each other through the transmission part 2311 and the matching part 2112, so that the power generated by the driving member 21 is more stably transmitted to the driving shaft 23, so that the driving shaft 23 rotates more stably, thereby improving the stability of the transmission connection between the driving member 21 and the driving shaft 23. The eccentric shaft 22 is connected with the brush plate 1 in a transmission manner, so that when the eccentric shaft 22 rotates, the brush plate 1 can be driven to rotate relative to the brush handle 11.

[0040] In this embodiment, the electric toothbrush includes a brush plate 1, a brush handle 11 and a body 12. The brush plate 1 is rotatably connected to the brush handle 11, and the brush handle 11 is connected to the body 12. The driving member 21 includes a motor, a motor housing, a positive electrode connecting piece, a negative electrode connecting piece, a switch connecting piece and a battery. The motor housing is arranged in the body 12, the motor is installed in the motor housing, and the negative electrode of the motor is arranged on the motor housing. The motor is connected to the transmission shaft 211 by driving, the battery is arranged in the body 12, and the negative electrode connecting piece is connected to the negative electrode of the battery. The two ends of the positive electrode connecting piece are respectively connected to the positive electrode of the motor and the positive electrode of the battery, so that the positive electrode of the motor is connected to the positive electrode of the battery. A button is provided on one side of the body 12, the switch connecting piece is connected to the negative electrode connecting piece, and the button is connected to the switch connecting piece by driving, and the user can press the button to connect the switch connecting piece to the negative electrode of the motor on the motor housing, so as to conveniently turn on the electric toothbrush.

[0041] like Figure 1 , Figure 2 and Figure 5As shown, in this embodiment, the driving member 21 has an output shaft 2115, and a second shaft hole 2113 is provided at one end of the transmission shaft 211 away from the first shaft hole 2111, and the output shaft 2115 is inserted into the second shaft hole 2113, and the output shaft 2115 is in transmission connection with the transmission shaft 211.

[0042] In this embodiment, the transmission mechanism also includes waterproof silicone, which is sleeved on the driving member 21, and the other side of the waterproof silicone is in contact with the body 12. The output shaft 2115 is passed through the waterproof silicone to prevent the driving member 21 from being dampened.

[0043] In this embodiment, the hole shape of the second shaft hole 2113 matches the outer shape of the output shaft 2115, and the output shaft 2115 is inserted into the second shaft hole 2113 so that the output shaft 2115 is connected to the transmission shaft 211, so that the driving member 21 can stably transmit power to the transmission shaft 211 through the output shaft 2115.

[0044] like Figure 2 and Figure 3 As shown, in this embodiment, the outer circumferential surface of the connecting section 231 is circumferentially provided with a plurality of the transmission parts 2311, and the inner circumferential surface of the first axial hole 2111 is circumferentially provided with a plurality of the matching parts 2112, and the transmission parts 2311 and the matching parts 2112 are plugged in one to one to form a transmission fit.

[0045] In this embodiment, the plurality of transmission parts 2311 can be set to four, and the four transmission parts 2311 are spliced ​​together to form a cross-shaped connecting section 231, thereby saving the manufacturing material of the connecting section 231, and further reducing the output power of the motor. The plurality of matching parts 2112 can be set to four corresponding to the number of transmission parts 2311, and the transmission parts 2311 and the matching parts 2112 are plugged in one-to-one to form a transmission match, thereby improving the stability of the transmission match between the connecting section 231 and the transmission shaft 211.

[0046] like Figure 2 and Figure 3 As shown, in this embodiment, the inner wall surface of the first axial hole 2111 is convexly provided with a plurality of protrusions 2114, and the plurality of protrusions 2114 are arranged along the circumference of the first axial hole 2111, and a first groove is formed between any two adjacent protrusions 2114, and the first groove forms the matching portion 2112, and the transmission portion 2311 is inserted into the first groove one by one, and the two sides of the transmission portion 2311 are respectively abutted against the groove wall of the first groove.

[0047] In this embodiment, the plurality of protrusions 2114 can be set to four, and the four protrusions 2114 are arranged along the circumference of the first shaft hole 2111. A first groove is formed between any two adjacent protrusions 2114. The four protrusions 2114 can form four first grooves, and the four first grooves can form four matching parts 2112. The plurality of transmission parts 2311 can be set to four corresponding to the number of matching parts 2112. The four transmission parts 2311 are spliced ​​together to form a connecting section 231 with a cross shape. The four matching parts 2112 can be spliced ​​together to form a first shaft hole 2111 with a cross shape. The transmission parts 2311 are inserted into the first groove one by one, and the two sides of the transmission part 2311 are respectively in contact with the groove wall of the first groove, thereby further improving the transmission stability of the connecting section 231 and the transmission shaft 211.

[0048] like Figure 2 and Figure 4 As shown, in this embodiment, the transmission portion 2311 is in the shape of a long strip extending along the axial direction of the connecting section 231 .

[0049] In this embodiment, the transmission portion 2311 is in the shape of an elongated strip and extends from one end of the connecting section 231 to the other end, thereby increasing the contact area with the matching portion 2112 for transmission cooperation, thereby further improving the stability and reliability of the transmission connection between the connecting section 231 and the transmission shaft 211.

[0050] like Figure 4 As shown, in this embodiment, the transmission part 2311 includes a first transmission section 2312 and a transmission head 2313 that are interconnected. The transmission head 2313 is located at one end of the first transmission section 2312 close to the transmission shaft 211, and the width of the transmission head 2313 gradually decreases from the first transmission section 2312 toward the transmission head 2313.

[0051] In this embodiment, the first transmission section 2312 may be in the shape of a long strip, and the first transmission section 2312 extends from one end of the connection section 231 to the other end, thereby increasing the contact area of ​​the transmission with the matching portion 2112, thereby further improving the stability and reliability of the transmission between the connection section 231 and the transmission shaft 211. The width of the transmission head 2313 gradually decreases from the first transmission section 2312 toward the transmission head 2313, thereby ensuring that the strength of the transmission part 2311 can be stable with the matching portion 2112, while further saving the manufacturing material of the transmission part 2311, thereby making the transmission part 2311 lighter, thereby reducing the output power of the motor.

[0052] like Figure 4As shown, in this embodiment, the driving shaft 23 includes a first shaft body 232 and a limiting portion 233 arranged at one end of the first shaft body 232, and the connecting section 231 is arranged on the side of the limiting portion 233 away from the first shaft body 232. When the connecting section 231 is inserted into the first shaft hole 2111, the limiting portion 233 is in limiting contact with the end face of the transmission shaft 211.

[0053] In this embodiment, the outer diameter of the limiting portion 233 may be greater than the outer diameter of the connecting section 231, and the outer diameter of the first shaft body 232 may be greater than the outer diameter of the connecting section 231. The limiting portion 233 is connected between the first shaft body 232 and the connecting section 231, thereby improving the structural strength of the drive shaft 23. When the connecting section 231 is inserted into the first shaft hole 2111, the limiting portion 233 is in limited contact with the end surface of the transmission shaft 211, thereby limiting the axial movement of the drive shaft 23 close to the driving member 21.

[0054] like Figure 2 As shown, in this embodiment, the eccentric shaft 22 includes a second shaft body 221 and a second transmission section 222 arranged at one end of the second shaft body 221, and the end of the drive shaft 23 away from the connecting section 231 is provided with a connecting hole 234, and the second transmission section 222 is inserted into the connecting hole 234 to enable the eccentric shaft 22 to be connected to the drive shaft 23 in transmission.

[0055] In this embodiment, the second transmission section 222 is inserted into the connection hole 234, so that the eccentric shaft 22 is connected to the drive shaft 23 in transmission, thereby improving the stability of the transmission between the eccentric shaft 22 and the drive shaft 23. The shape of the second transmission section 222 can be set to a polygon, and the shape of the connection hole 234 can be set to a polygonal hole accordingly, so that the second transmission section 222 is more stably inserted into the connection hole 234, thereby further improving the stability of the transmission between the eccentric shaft 22 and the drive shaft 23.

[0056] like Figure 2 As shown, in this embodiment, the eccentric shaft 22 also includes an eccentric segment 223 provided at one end of the second shaft body 221 away from the second transmission segment 222, and the brush disc 1 is provided with a second groove 13, and the eccentric segment 223 is inserted into the second groove 13 to enable the eccentric shaft 22 to be transmission-connected with the brush disc 1.

[0057] In this embodiment, the eccentric segment 223 is inserted into the second groove 13. When the eccentric shaft 22 rotates, the eccentric segment 223 periodically pushes the inner wall of the second groove 13, thereby driving the brush plate 1 to rotate back and forth periodically. The rotation speed of the brush plate 1 can be controlled by adjusting the rotation speed of the eccentric shaft 22, so that the eccentric shaft 22 can more stably transmit power to the brush plate 1 through the second groove 13.

[0058] The utility model also proposes an electric toothbrush, which includes a transmission mechanism. The specific structure of the transmission mechanism refers to the above embodiment. Since the electric toothbrush adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0059] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A transmission mechanism, applied to an electric toothbrush, the electric toothbrush comprising a brush plate, a brush handle and a body connected to each other, characterized in that: The transmission mechanism comprises: A movement, the movement comprising a driving member, an eccentric shaft and a driving shaft, the driving member is used to be arranged in the body, and the driving shaft and the eccentric shaft are used to be arranged in the brush handle; One end of the driving shaft is drivingly connected to the eccentric shaft, the other end of the driving shaft is provided with a connecting section, the driving member is drivingly connected to a transmission shaft, the transmission shaft is provided with a first shaft hole for the connecting section to be inserted, the outer peripheral surface of the connecting section is provided with a transmission part, the inner wall surface of the first shaft hole is provided with a matching part for transmission with the transmission part; the eccentric shaft is drivingly connected to the brush disc; The driving member is used to drive the driving shaft to rotate via the transmission shaft, so that the driving shaft drives the eccentric shaft to rotate, and further drives the brush plate to rotate relative to the brush handle.

2. The transmission mechanism according to claim 1, characterized in that: The driving member has an output shaft. A second shaft hole is provided at one end of the transmission shaft away from the first shaft hole. The output shaft is inserted into the second shaft hole. The output shaft is in transmission connection with the transmission shaft.

3. The transmission mechanism according to claim 1, characterized in that: The outer circumferential surface of the connecting section is provided with a plurality of the transmission parts along the circumferential direction, and the inner circumferential surface of the first axial hole is provided with a plurality of the matching parts along the circumferential direction. The transmission parts and the matching parts are plugged in one to one to form transmission matching.

4. The transmission mechanism according to claim 3, characterized in that: The inner wall surface of the first axial hole is convexly provided with a plurality of protrusions, and the plurality of protrusions are arranged along the circumference of the first axial hole. A first groove is formed between any two adjacent protrusions, and the first groove forms the matching part. The transmission part is inserted into the first groove one by one, and the two sides of the transmission part are respectively abutted against the groove wall of the first groove.

5. The transmission mechanism according to claim 3, characterized in that: The transmission part is in the shape of a long strip extending along the axial direction of the connecting section.

6. The transmission mechanism according to claim 4, characterized in that: The transmission part includes a first transmission section and a transmission head which are connected to each other. The transmission head is located at one end of the first transmission section close to the transmission shaft. The width of the transmission head gradually decreases from the first transmission section toward the transmission head.

7. The transmission mechanism according to claim 1, characterized in that: The driving shaft includes a first shaft body and a limiting portion arranged at one end of the first shaft body, the connecting section is arranged on a side of the limiting portion away from the first shaft body, and when the connecting section is inserted into the first shaft hole, the limiting portion is in limiting contact with the end face of the transmission shaft.

8. The transmission mechanism according to claim 1, characterized in that: The eccentric shaft includes a second shaft body and a second transmission section arranged at one end of the second shaft body, and a connecting hole is provided at one end of the drive shaft away from the connecting section. The second transmission section is inserted into the connecting hole to connect the eccentric shaft to the drive shaft.

9. The transmission mechanism according to claim 8, characterized in that: The eccentric shaft also includes an eccentric section arranged at one end of the second shaft body away from the second transmission section. The brush plate is provided with a second groove, and the eccentric section is inserted into the second groove to achieve transmission connection between the eccentric shaft and the brush plate.

10. An electric toothbrush, characterized in that: The invention comprises a transmission mechanism as claimed in any one of claims 1 to 9.

Images