Brush head assembly and electric toothbrush

Abstract

The utility model discloses a brush head assembly and an electric toothbrush, and relates to the technical field of electric toothbrushes, the brush head assembly comprises a brush disc, the brush disc comprises a disc body, a first rotating part and a second rotating part, and the first rotating part and the second rotating part are arranged on one side of the disc body; the brush disc is rotatably connected with the brush handle, the brush handle comprises a body, the body is provided with a containing cavity with an opening in one side, the inner side wall of the containing cavity is provided with a first limiting part and a second limiting part, the first limiting part abuts against the first rotating part in a limiting mode, and the second limiting part abuts against the second rotating part in a limiting mode; the technical scheme provided by the utility model has the technical effects that the first rotating part and the second rotating part on the disc body are arranged in the accommodating cavity, the first limiting part is propped against the first rotating part in a limiting manner, and the second limiting part is propped against the second rotating part in a limiting manner, so that the brush disc is limited to move towards the opening side of the accommodating cavity when rotating relative to the brush handle.

Description

Technical Field

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

[0002] The electric toothbrush drives the drive shaft to rotate through the driving 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 on the brush head to move back and forth to clean the teeth, thus solving the problem of traditional manual brushing that is laborious.

[0003] In the existing electric toothbrush, the brush head rotates under the eccentric force generated by the rotation of the eccentric shaft, which makes the brush head unstable when rotating relative to the brush handle. The brush head is easily separated from the brush handle, thereby affecting the use of the electric toothbrush. Utility Model Content

[0004] The main purpose of the utility model is to provide a brush head assembly and an electric toothbrush, aiming to improve the stability of the transmission connection between the brush head and the brush handle, thereby preventing the brush head from being separated from the brush handle.

[0005] To achieve the above-mentioned purpose, the brush head assembly proposed in the utility model includes a brush plate, wherein the brush plate includes a plate body, and a first rotating part and a second rotating part arranged on one side of the plate body;

[0006] A brush handle, wherein the brush disc is rotatably connected to the brush handle, and the brush handle comprises a body, wherein the body has a accommodating cavity with an open side, the first rotating part and the second rotating part are arranged in the accommodating cavity, and the inner side wall of the accommodating cavity is provided with a first limiting part and a second limiting part, the first limiting part is in limiting abutment with the first rotating part, and the second limiting part is in limiting abutment with the second rotating part, so as to limit the movement of the brush disc relative to the brush handle toward the open side of the accommodating cavity.

[0007] In one embodiment, the brush disc further includes a first connecting portion, which is disposed on a side of the disc body facing the brush handle, and a second connecting portion is disposed on an inner wall of the accommodating cavity, and the first connecting portion is rotatably connected to the second connecting portion.

[0008] In one embodiment, the brush head assembly further includes a fixing member, the first connecting portion is provided with a baffle, the fixing member is passed through the main body, and the fixing member abuts against a side of the baffle close to the disc body.

[0009] In one embodiment, the brush head assembly further comprises an eccentric shaft, which is rotatably disposed in the brush handle, the first connecting portion is provided with a first groove, the driving end of the eccentric shaft is disposed in the first groove, and the eccentric shaft is transmission-connected to the brush disc.

[0010] In one embodiment, the brush head assembly also includes a fixed sleeve, the main body is provided with a cavity connected to the accommodating cavity, the eccentric shaft is rotatably disposed in the cavity, the eccentric shaft is transmission-connected to the fixed sleeve, a plurality of first protrusions are protruding from the inner wall of the cavity, the fixed sleeve is disposed in the cavity, and the plurality of first protrusions abut against the fixed sleeve.

[0011] In one embodiment, the first connecting portion is provided with a transmission hole, and the second connecting portion is inserted into the transmission hole, so that the first connecting portion and the second connecting portion are transmission-connected.

[0012] In one embodiment, the brush head assembly further comprises an elastic member, and the elastic member elastically abuts between the brush plate and the brush handle.

[0013] In one embodiment, a second groove is formed between the first rotating portion and the disc body, a third groove is formed between the second rotating portion and the disc body, the first limiting portion is engaged in the second groove, and the second limiting portion is engaged in the third groove to limit the movement of the brush disc relative to the brush handle toward the open side of the accommodating cavity.

[0014] In one embodiment, the first rotating portion includes a first connecting arm, and a second protrusion is provided on the side of the first connecting arm away from the disk body, the second groove is formed between the second protrusion and the disk body, and the second protrusion abuts the first limiting portion; and / or, the second rotating portion includes a second connecting arm, and a third protrusion is provided on the side of the second connecting arm away from the disk body, the third groove is formed between the third protrusion and the disk body, and the third protrusion abuts the second limiting portion.

[0015] The utility model also provides an electric toothbrush, comprising a brush head assembly as described in any of the above embodiments.

[0016] The technical solution of the utility model adopts the first rotating part and the second rotating part on the disc body to be arranged in the accommodating cavity, the first limiting part is in limiting abutment with the first rotating part, and the second limiting part is in limiting abutment with the second rotating part, thereby limiting the movement of the brush disc toward the open side of the accommodating cavity when the brush disc rotates relative to the brush handle, thereby improving the stability of the transmission connection between the brush head and the brush handle, and preventing the brush head from detaching from the brush handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 A schematic structural diagram of an embodiment of a brush head assembly provided by the utility model;

[0019] Figure 2 An exploded view of the structure of an embodiment of a brush head assembly provided by the utility model;

[0020] Figure 3 A structural cross-sectional view of an embodiment of a brush head assembly provided by the utility model;

[0021] Figure 4 for Figure 3 An enlarged schematic diagram of the marker A;

[0022] Figure 5 A structural schematic diagram of an embodiment of a brush plate provided by the utility model;

[0023] Figure 6 A structural schematic diagram of an embodiment of a brush handle provided by the utility model;

[0024] Figure 7 This is a structural cross-sectional view of another embodiment of a brush handle provided by the utility model.

[0025] Description of Figure Numbers:

[0026] 1. Brush plate; 11. Plate body; 12. First rotating part; 121. Second groove; 122. First connecting arm; 123. Second protrusion; 13. Second rotating part; 131. Third groove; 132. Second connecting arm; 133. Third protrusion; 14. First connecting part; 141. Baffle; 142. First groove; 143. Transmission hole; 2. Brush handle; 21. Main body; 211. Accommodating cavity; 2111. First limiting part; 2112. Second limiting part; 2113. Second connecting part; 212. Cavity; 2121. First protrusion; 3. Fixing member; 4. Eccentric shaft; 5. Fixing sleeve; 6. Elastic member.

[0027] 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

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The electric toothbrush drives the driving shaft to rotate through the driving member, thereby driving the eccentric shaft 4 to rotate to generate eccentric force, so that the eccentric shaft 4 drives the brush plate 1 to rotate, thereby driving the bristles on the brush head to move back and forth to clean the teeth, thereby solving the problem of traditional manual brushing.

[0032] However, in the process of conceiving and implementing this application, the inventor found that there are at least the following problems:

[0033] In the existing electric toothbrush, the brush head rotates under the eccentric force generated by the rotation of the eccentric shaft 4, which makes the brush head unstable when rotating relative to the brush handle 2, and the brush head is easily separated from the brush handle 2, thereby affecting the use of the electric toothbrush.

[0034] The utility model provides a brush head assembly.

[0035] See also Figure 1 , Figure 2 and Figure 6In one embodiment of the utility model, the brush head assembly includes a brush disc 1, and the brush disc 1 includes a disc body 11, and a first rotating part 12 and a second rotating part 13 provided on one side of the disc body 11;

[0036] A brush handle 2, wherein the brush disc 1 is rotatably connected to the brush handle 2, and the brush handle 2 comprises a body 21, wherein the body 21 has a receiving cavity 211 with one side open, wherein the first rotating part 12 and the second rotating part 13 are arranged in the receiving cavity 211, and wherein the inner side wall of the receiving cavity 211 is provided with a first limiting part 2111 and a second limiting part 2112, wherein the first limiting part 2111 is in limiting contact with the first rotating part 12, and the second limiting part 2112 is in limiting contact with the second rotating part 13, so as to limit the movement of the brush disc 1 relative to the brush handle 2 toward the open side of the receiving cavity 211;

[0037] The technical solution of the utility model adopts the first rotating part 12 and the second rotating part 13 on the disc body 11 to be arranged in the accommodating cavity 211, the first limiting part 2111 is in limiting contact with the first rotating part 12, and the second limiting part 2112 is in limiting contact with the second rotating part 13, thereby limiting the movement of the brush disc 1 toward the open side of the accommodating cavity 211 when rotating relative to the brush handle 2, thereby improving the stability of the transmission connection between the brush head and the brush handle 2, and preventing the brush head from detaching from the brush handle 2.

[0038] In this embodiment, the brush disc 1 includes a disc body 11, which may be cylindrical, and a first rotating part 12 and a second rotating part 13 are provided on a side of the disc body 11 away from the bristles. The brush disc 1 is rotatably connected to a brush handle 2, and the brush handle 2 includes a body 21, and the body 21 has a receiving cavity 211 with one side open. The inner side wall of the receiving cavity 211 may be arc-shaped, the outer side wall of the first rotating part 12 may be arc-shaped, and the outer side wall of the second rotating part 13 may be arc-shaped, so that the disc body 11, the first rotating part 12 and the second rotating part 13 can be more conveniently assembled into the receiving cavity 211, so that the first rotating part 12 and the second rotating part 13 are accommodated in the receiving cavity 211. The inner wall of the accommodating cavity 211 is provided with a first limiting portion 2111 and a second limiting portion 2112, the first rotating portion 12 is limitedly abutted against the outer wall of the first limiting portion 2111 away from the open side, and the second limiting portion 2112 is limitedly abutted against the outer wall of the second rotating portion 13 away from the open side, so that when the brush disc 1 rotates relative to the brush handle 2, the first rotating portion 12 is limitedly abutted by the first limiting portion 2111, and the second rotating portion 13 is limitedly abutted by the second limiting portion 2112, thereby improving the stability of the rotation of the brush disc 1 relative to the brush handle 2, thereby limiting the movement of the brush disc 1 relative to the brush handle 2 toward the open side of the accommodating cavity 211, and preventing the brush disc 1 from falling off the brush handle 2. The first rotating part 12 and the second rotating part 13 can be arranged on the disk body 11 in a mirror-like manner with the central axis of the disk body 11 as the axis, and the first limiting part 2111 and the second limiting part 2112 can be arranged on the inner side wall of the accommodating cavity 211 in a mirror-like manner with the central axis of the accommodating cavity 211 as the axis, so as to facilitate the limiting abutment of the first limiting part 2111 with the first rotating part 12, and the limiting abutment of the second limiting part 2112 with the second rotating part 13.

[0039] like Figure 1 and Figure 2 As shown, in this embodiment, the brush disc 1 also includes a first connecting portion 14, which is arranged on the side of the disc body 11 facing the brush handle 2, and the inner wall of the accommodating cavity 211 is provided with a second connecting portion 2113, and the first connecting portion 14 is rotatably connected to the second connecting portion 2113.

[0040] In this embodiment, the first connecting portion 14 is rotatably connected to the second connecting portion 2113, thereby cooperating with the first limiting portion 2111 and the first rotating portion 12 to limit the abutment, and cooperating with the second limiting portion 2112 and the second rotating portion 13 to limit the abutment, thereby further improving the stability of the transmission connection between the brush plate 1 and the brush handle 2, thereby preventing the brush plate 1 from falling off the brush handle 2 during rotation.

[0041] like Figure 1 and Figure 2As shown, in this embodiment, the brush head assembly further includes a fixing member 3, the first connecting portion 14 is provided with a baffle 141, the fixing member 3 is passed through the body 21, and the fixing member 3 abuts against a side of the baffle 141 close to the disc body 11.

[0042] In this embodiment, the fixing member 3 is arranged to pass through the main body 21 so that the fixing member 3 can abut against the side of the baffle 141 close to the disc body 11, thereby cooperating with the first limiting portion 2111 and the first rotating portion 12 to limit the abutment, and cooperating with the second limiting portion 2112 and the second rotating portion 13 to limit the abutment, thereby further limiting the movement of the brush disc 1 relative to the brush handle 2 toward the open side of the accommodating cavity 211, thereby preventing the brush disc 1 from falling off the brush handle 2 when rotating.

[0043] like Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the brush head assembly also includes an eccentric shaft 4, which is rotatably disposed in the brush handle 2, and the first connecting portion 14 is provided with a first groove 142, and the driving end of the eccentric shaft 4 is disposed in the first groove 142, and the eccentric shaft 4 is transmission-connected to the brush disc 1.

[0044] In this embodiment, the first groove 142 may be consistent with the length of the first connection portion 14 along the axial direction of the first connection portion 14. The inner side wall of the first groove 142 away from the first connection portion 14 may be convexly provided with a protrusion, and when the eccentric shaft 4 rotates, the driving end of the eccentric shaft 4 abuts against the protrusions on both sides, thereby driving the brush plate 1 to move relative to the brush handle 2, so that the eccentric shaft 4 can more stably transmit power to the brush plate 1 through the first groove 142.

[0045] like Figure 2 and Figure 7 As shown, in this embodiment, the brush head assembly also includes a fixed sleeve 5, the main body 21 is provided with a cavity 212 connected to the accommodating cavity 211, the eccentric shaft 4 is rotatably arranged in the cavity 212, the eccentric shaft 4 is transmission-connected with the fixed sleeve 5, a plurality of first protrusions 2121 are convexly provided on the inner wall of the cavity 212, the fixed sleeve 5 is arranged in the cavity 212, and the plurality of first protrusions 2121 abut against the fixed sleeve 5.

[0046] In this embodiment, the brush head assembly also includes a fixed sleeve 5, which is arranged in the brush handle 2, and the fixed sleeve 5 is connected to the eccentric shaft 4 in a transmission manner so that the eccentric shaft 4 can rotate relative to the fixed sleeve 5. The fixed sleeve 5 can limit the movement of the eccentric shaft 4 in the cavity 212 without affecting the rotation of the eccentric shaft 4, thereby improving the stability of the transmission between the eccentric shaft 4 and the drive shaft, thereby preventing the eccentric shaft 4 from being separated from the drive shaft when rotating. In order to improve the connection stability between the fixed sleeve 5 and the inner wall of the cavity 212, a plurality of first protrusions 2121 are convexly provided on the inner wall of the cavity 212, and the fixed sleeve 5 is arranged in the cavity 212, and the plurality of first protrusions 2121 abut against the fixed sleeve 5.

[0047] like Figure 5 As shown, in this embodiment, the first connecting portion 14 is provided with a transmission hole 143 , and the second connecting portion 2113 is inserted into the transmission hole 143 , so that the first connecting portion 14 and the second connecting portion 2113 are transmission-connected.

[0048] In this embodiment, the second connection part 2113 is inserted into the transmission hole 143 so that the first connection part 14 can rotate relative to the second connection part 2113 , thereby further improving the stability of the rotation of the first connection part 14 relative to the second connection part 2113 .

[0049] like Figure 1 and Figure 2 As shown, in this embodiment, the brush head assembly further includes an elastic member 6 , and the elastic member 6 elastically abuts between the brush plate 1 and the brush handle 2 .

[0050] In this embodiment, the elastic member 6 may be a spring, the second connection portion 2113 may be provided with a mounting hole, the elastic member 6 is provided in the mounting hole, one end of the elastic member 6 elastically abuts against the inner wall of the mounting hole, and the other end of the elastic member 6 abuts against the inner wall of the transmission hole 143. The elastic member 6 is used to provide tension for the connection between the first connection portion 14 and the second connection portion 2113, thereby further limiting the first connection portion 14 from moving relative to the second connection portion 2113 toward the open side of the accommodating cavity 211, thereby preventing the brush disc 1 from falling off the brush handle 2 when rotating.

[0051] like Figure 5 As shown, in this embodiment, a second groove 121 is formed between the first rotating portion 12 and the disc body 11, a third groove 131 is formed between the second rotating portion 13 and the disc body 11, the first limiting portion 2111 is clamped in the second groove 121, and the second limiting portion 2112 is clamped in the third groove 131 to limit the movement of the brush disc 1 relative to the brush handle 2 toward the open side of the accommodating cavity 211.

[0052] In this embodiment, by setting the first limiting portion 2111 to be clamped in the second groove 121, and by setting the second limiting portion 2112 to be clamped in the third groove 131, the stability of the limiting abutment between the first limiting portion 2111 and the first rotating portion 12 is further improved, and the stability of the limiting abutment between the second limiting portion 2112 and the second rotating portion 13 is further improved, thereby further limiting the movement of the brush plate 1 relative to the brush handle 2 toward the open side of the accommodating cavity 211, thereby preventing the brush plate 1 from falling off the brush handle 2 during rotation.

[0053] In this embodiment, the brush plate 1 rotates toward the side close to the first rotating portion 12, and the first limiting portion 2111 gradually approaches and abuts against the inner side wall of the second groove 121, thereby limiting the brush plate 1 from continuing to rotate; the brush plate 1 rotates toward the side close to the second rotating portion 13, and the second limiting portion 2112 gradually approaches and abuts against the inner side wall of the third groove 131, thereby limiting the brush plate 1 from continuing to rotate.

[0054] like Figure 5 As shown, in the present embodiment, the first rotating portion 12 includes a first connecting arm 122, and a second protrusion 123 is provided on the side of the first connecting arm 122 away from the disk body 11, the second groove 121 is formed between the second protrusion 123 and the disk body 11, and the second protrusion 123 abuts against the first limiting portion 2111; and / or, the second rotating portion 13 includes a second connecting arm 132, and a third protrusion 133 is provided on the side of the second connecting arm 132 away from the disk body 11, the third groove 131 is formed between the third protrusion 133 and the disk body 11, and the third protrusion 133 abuts against the second limiting portion 2112.

[0055] In this embodiment, by providing the second protrusion 123 to abut the side wall of the first limiting portion 2111 away from the open side, and by providing the third protrusion 133 to abut the side wall of the second limiting portion 2112 away from the open side, the stability of the limiting abutment between the first rotating portion 12 and the first limiting portion 2111 is further improved, and the stability of the limiting abutment between the second limiting portion 2112 and the second rotating portion 13 is further improved, thereby further limiting the movement of the brush plate 1 relative to the brush handle 2 toward the open side of the accommodating cavity 211, thereby preventing the brush plate 1 from falling off the brush handle 2 during rotation.

[0056] In this embodiment, the second protrusion 123 can move on the first limiting portion 2111 following the rotation of the brush disc 1, so that the first limiting portion 2111 gradually approaches the second groove 121. When the first limiting portion 2111 abuts against the inner side wall of the second groove 121, the brush disc 1 stops rotating and rotates toward the side away from the first limiting portion 2111. The third protrusion 133 can move on the second limiting portion 2112 following the rotation of the brush disc 1, so that the second limiting portion 2112 gradually approaches the third groove 131. When the second limiting portion 2112 abuts against the inner side wall of the third groove 131, the brush disc 1 stops rotating and rotates toward the side away from the second limiting portion 2112.

[0057] The utility model also proposes an electric toothbrush, which includes a brush head assembly. The specific structure of the brush head assembly refers to the above-mentioned embodiment. Since the electric toothbrush adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0058] In this embodiment, the electric toothbrush includes a brush plate 1, a brush handle 2 and a body. The brush plate 1 is rotatably connected to the brush handle 2, and the brush handle 2 is connected to the body. The body is provided with a driving member, and the driving member includes a motor, a motor housing, a positive electrode connecting piece, a negative electrode connecting piece, a switch connecting piece, a battery, a transmission shaft and a drive shaft. The motor housing is arranged in the body, the motor is installed in the motor housing, and the negative pole of the motor is arranged on the motor housing. The motor is drivingly connected to the transmission shaft, the transmission shaft is drivingly connected to the drive shaft, and the drive shaft is drivingly connected to the eccentric shaft 4. The battery is arranged in the body, and the negative electrode connecting piece is connected to the negative pole of the battery. The two ends of the positive electrode connecting piece are respectively connected to the motor and the battery, so that the positive pole of the motor is connected to the positive pole of the battery. A button is provided on one side of the body, and the switch connecting plate is connected to the negative connecting plate. The button is transmission-connected to the switch connecting plate. The user can press the button to connect the switch connecting plate to the negative pole of the motor on the motor housing, thereby conveniently turning on the electric toothbrush, so that the motor drives the transmission shaft to rotate, the transmission shaft drives the drive shaft to rotate, and the drive shaft drives the eccentric shaft 4 to rotate, thereby causing the eccentric shaft 4 to drive the brush disc 1 to rotate relative to the brush handle 2.

[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 brush head assembly, characterized in that: include: A brush plate, the brush plate comprising a plate body, and a first rotating part and a second rotating part provided on one side of the plate body; A brush handle, wherein the brush disc is rotatably connected to the brush handle, and the brush handle comprises a body, wherein the body has a accommodating cavity with an open side, the first rotating part and the second rotating part are arranged in the accommodating cavity, and the inner side wall of the accommodating cavity is provided with a first limiting part and a second limiting part, the first limiting part is in limiting abutment with the first rotating part, and the second limiting part is in limiting abutment with the second rotating part, so as to limit the movement of the brush disc relative to the brush handle toward the open side of the accommodating cavity.

2. The brush head assembly according to claim 1, characterized in that: The brush plate further comprises a first connection part, which is arranged on a side of the plate body facing the brush handle. The inner wall of the accommodating cavity is provided with a second connection part, and the first connection part is rotatably connected to the second connection part.

3. The brush head assembly according to claim 2, characterized in that: The brush head assembly also includes a fixing member, the first connecting portion is provided with a baffle, the fixing member is passed through the main body, and the fixing member abuts against a side of the baffle close to the disc body.

4. The brush head assembly according to claim 2, characterized in that: The brush head assembly also includes an eccentric shaft, which is rotatably disposed in the brush handle. The first connecting portion is provided with a first groove, and the driving end of the eccentric shaft is disposed in the first groove, and the eccentric shaft is drivingly connected to the brush disc.

5. The brush head assembly according to claim 4, characterized in that: The brush head assembly also includes a fixed sleeve, the main body is provided with a cavity connected to the accommodating cavity, the eccentric shaft is rotatably arranged in the cavity, the eccentric shaft is transmission-connected with the fixed sleeve, a plurality of first protrusions are convexly provided on the inner wall of the cavity, the fixed sleeve is arranged in the cavity, and the plurality of first protrusions abut against the fixed sleeve.

6. The brush head assembly according to claim 2, characterized in that: The first connecting part is provided with a transmission hole, and the second connecting part is inserted into the transmission hole, so that the first connecting part and the second connecting part are transmission-connected.

7. The brush head assembly according to claim 6, characterized in that: The brush head assembly further comprises an elastic member, and the elastic member is elastically abutted between the brush plate and the brush handle.

8. The brush head assembly according to any one of claims 1 to 7, characterized in that: A second groove is formed between the first rotating part and the disc body, a third groove is formed between the second rotating part and the disc body, the first limiting part is clamped in the second groove, and the second limiting part is clamped in the third groove to limit the movement of the brush disc relative to the brush handle toward the open side of the accommodating cavity.

9. The brush head assembly according to claim 8, characterized in that: The first rotating part includes a first connecting arm, and a second protrusion is provided on the side of the first connecting arm away from the disk body, the second groove is formed between the second protrusion and the disk body, and the second protrusion abuts the first limiting part; and / or, the second rotating part includes a second connecting arm, and a third protrusion is provided on the side of the second connecting arm away from the disk body, the third groove is formed between the third protrusion and the disk body, and the third protrusion abuts the second limiting part.

10. An electric toothbrush, characterized in that: The brush head assembly comprises the brush head assembly as claimed in any one of claims 1 to 9.

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